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JP2008155587A - Manufacturing method of hollow resin molded product - Google Patents

Manufacturing method of hollow resin molded product Download PDF

Info

Publication number
JP2008155587A
JP2008155587A JP2006350000A JP2006350000A JP2008155587A JP 2008155587 A JP2008155587 A JP 2008155587A JP 2006350000 A JP2006350000 A JP 2006350000A JP 2006350000 A JP2006350000 A JP 2006350000A JP 2008155587 A JP2008155587 A JP 2008155587A
Authority
JP
Japan
Prior art keywords
shell portion
upper shell
lower shell
molded product
flange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2006350000A
Other languages
Japanese (ja)
Inventor
Masahide Kobayashi
奨英 小林
Masayuki Goto
正行 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
FTS Co Ltd
Original Assignee
Toyota Motor Corp
FTS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, FTS Co Ltd filed Critical Toyota Motor Corp
Priority to JP2006350000A priority Critical patent/JP2008155587A/en
Publication of JP2008155587A publication Critical patent/JP2008155587A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/326—Shaping the burr, e.g. by the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81413—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being non-symmetrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81425—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being stepped, e.g. comprising a shoulder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
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    • B60K2015/0346—Arrangements or special measures related to fuel tanks or fuel handling for fixing or mounting parts of the fuel tank together by welding

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a hollow resin molded product having sufficient strength and rigidity and easy to manufacture. <P>SOLUTION: In the manufacturing method of the hollow resin molded product 1 made of a thermoplastic synthetic resin, an upper shell part 10 and a lower shell part 20 are divided and separately molded by injection molding. The respective opening peripheral edge parts 11 and 21 of the upper shell part 10 and the lower shell part 20 are welded and, at the time when the temperature of joining surfaces lowers to a temperature range from a temperature higher by 50°C than the crystallization temperature of the synthetic resin, which constitutes the upper shell part 10 and the lower shell part 20 to the crystallization starting temperature of the synthetic resin, the opening peripheral edge parts 11 and 21 are compressed under pressure higher than pressure contact pressure to weld the opening peripheral edge parts 11 and 21 of the upper shell part 10 and the lower shell part 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、別々に分割して射出形成されたアッパーシェル部とロアシェル部を合体させて溶着し形成された、熱可塑性合成樹脂製の中空樹脂成形品の製造方法に関するものである。 The present invention relates to a method for producing a hollow resin molded product made of a thermoplastic synthetic resin, which is formed by fusing an upper shell portion and a lower shell portion that are separately divided and formed by injection.

従来、自動車用燃料タンク等の大型の中空樹脂成形品は、中空体を成形することの容易性からブロー成形方法が多く用いられてきた。ブロー成形方法では、溶融した合成樹脂のパリソンを円筒状にして上から押出して、そのパリソンを金型で挟みパリソン中に空気を吹き込み、中空樹脂成形品を製造していた。 Conventionally, blow molding methods have been frequently used for large hollow resin molded articles such as automobile fuel tanks because of the ease of molding hollow bodies. In the blow molding method, a melted synthetic resin parison is formed into a cylindrical shape and extruded from above, the parison is sandwiched between molds, and air is blown into the parison to produce a hollow resin molded product.

しかし、この方法では、自動車用燃料タンクのような大型の中空樹脂成形品の場合は、パリソンの全体の重量が大きくなり、また、自動車用燃料タンクのような強度が必要な場合に、強度増加のため厚肉の中空樹脂成形品を製造するときにもパリソンの重量が増加して、溶融状のパリソンを成形機の上部から金型に入れるときに下方に垂れるため、上部の肉厚が下部の肉厚よりも薄くなる場合があった。
また、複雑な形状をした製品の場合は、パリソンを金型内で膨張させたときに、パリソンの膨張の割合が製品の部位によって異なる場合があり、製品の肉厚にバラツキが生じる場合があった。 However, with this method, in the case of a large hollow resin molded product such as a fuel tank for automobiles, the overall weight of the parison increases, and when strength such as a fuel tank for automobiles is required, the strength increases. Therefore, when manufacturing a thick hollow resin molded product, the weight of the parison also increases, and when the molten parison is dropped from the top of the molding machine into the mold, it drops downward, so the upper wall thickness is lower In some cases, it was thinner than the wall thickness.
In addition, in the case of a product with a complicated shape, when the parison is expanded in the mold, the expansion ratio of the parison may vary depending on the part of the product, and the thickness of the product may vary. It was.

また、ブロー成形製の中空樹脂成形品は、中空樹脂成形品内にポンプやバルブ等の付属品を取付けることも困難であり、リブや梁等を設けることも難しく、さらに、パリソンの膨張の割合が製品の部位によって異なる場合があり、タンクの肉厚にバラツキが生じる。従って、肉厚管理、品質管理に多大な労力を要していた。
そのため合成樹脂製中空体を上下に分割して、アッパーシェル部とロアシェル部をそれぞれ別に射出成形等により成形して、その後そのアッパーシェル部とロアシェル部の開口周縁部を溶着して中空樹脂成形品を形成する方法もある（例えば、特許文献１参照。）。 Also, blow molded hollow resin molded products are difficult to install accessories such as pumps and valves in the hollow resin molded products, it is difficult to provide ribs and beams, etc., and the percentage of parison expansion May vary depending on the part of the product, resulting in variations in tank wall thickness. Therefore, a great deal of labor has been required for wall thickness management and quality control.
Therefore, the synthetic resin hollow body is divided into upper and lower parts, and the upper shell part and the lower shell part are separately molded by injection molding or the like, and then the opening peripheral part of the upper shell part and the lower shell part are welded to form a hollow resin molded product. There is also a method of forming (see Patent Document 1, for example).

このような、アッパーシェル１１０とロアシェル１２０を融合する方法においては、例えば、図７の（ａ）と（ｂ）に示すように、アッパーシェル１１０とロアシェル１２０のそれぞれの開口周縁部１１１、１２１に形成したフランジ部１１２、１２２の対抗面を加熱し溶融させ、その後、押さえ治具４０でフランジ部１１２、１２２を圧接して、融合させていた。   In such a method of fusing the upper shell 110 and the lower shell 120, for example, as shown in FIGS. 7A and 7B, the opening peripheral portions 111 and 121 of the upper shell 110 and the lower shell 120 are respectively provided. The opposing surfaces of the formed flange portions 112 and 122 were heated and melted, and then the flange portions 112 and 122 were pressed and fused with the holding jig 40.

しかし、熱板と押さえ治具４０で開口周縁部１１１、１２１を溶着する場合は、フランジ部１１２、１２２を押さえると、図７の（ｃ）と（ｄ）に示すように、溶融した合成樹脂が中空樹脂成形品の内部方向に流出して、凸状部を形成する。この凸状部は先端が、開口周縁部１１１、１２１の溶着界面で分かれて、ノッチ状の凹部を形成する（例えば、特許文献２参照。）。   However, when the opening peripheral portions 111 and 121 are welded by the hot plate and the holding jig 40, when the flange portions 112 and 122 are pressed, as shown in FIGS. 7C and 7D, a molten synthetic resin is obtained. Flows out toward the inside of the hollow resin molded product to form a convex portion. The tip of this convex portion is divided at the welding interface between the opening peripheral edge portions 111 and 121 to form a notch-shaped concave portion (see, for example, Patent Document 2).

このノッチ状の凹部は、中空樹脂成形品に、衝撃が加わった場合に衝撃が集中し、中空樹脂成形品の溶着強度を低下せしめていた。
また、溶着する、開口周縁部１１１、１２１の充分な勘合のためには、高い寸法精度が必要であった。
特開平１１−３４１８０号公報 特開２０００−１１７８３６号公報 This notch-shaped concave portion concentrates the impact when an impact is applied to the hollow resin molded product, thereby reducing the welding strength of the hollow resin molded product.
In addition, high dimensional accuracy is required for sufficient fitting of the opening peripheral edge portions 111 and 121 to be welded.
JP-A-11-34180 JP 2000-117836 A

このようにアッパータンクとロアタンクを別々に形成した場合に、強度・剛性を充分有する、製造が容易な中空樹脂成形品の製造方法が求められていた。   Thus, when the upper tank and the lower tank are formed separately, a method for producing a hollow resin molded product having sufficient strength and rigidity and easy to produce has been demanded.

請求項１の本発明は、アッパーシェル部とロアシェル部をそれぞれ別々に金型で射出成形し、アッパーシェル部とロアシェル部の開口周縁部を合体して一体的に接合して形成する熱可塑性合成樹脂製の中空樹脂成形品の製造方法において、
アッパーシェル部とロアシェル部の開口周縁部の接合面は、それぞれその合成樹脂の融点を大きく上回る温度まで加熱されて溶融された後、相互に接合され、圧接して保持し、
接合面の温度が、アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度よりも５０℃高い温度から結晶化開始温度までの間に下がった時点で、圧接の圧接圧よりも高い圧力で開口周縁部を圧縮してアッパーシェル部とロアシェル部の開口周縁部を融合した中空樹脂成形品の製造方法である。 The present invention of claim 1 is a thermoplastic composition in which an upper shell portion and a lower shell portion are separately injection-molded with a mold, and the opening peripheral portions of the upper shell portion and the lower shell portion are combined and integrally joined. In the method for producing a resin hollow resin molded product,
The joint surfaces of the opening periphery of the upper shell part and the lower shell part are heated and melted to a temperature that greatly exceeds the melting point of the synthetic resin, and then joined to each other and held in pressure contact with each other.
When the temperature of the joint surface falls between a temperature higher by 50 ° C. than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion to the crystallization start temperature, the pressure is higher than the pressure pressure of the pressure welding. This is a method for manufacturing a hollow resin molded product in which the peripheral edge of the opening is compressed to fuse the peripheral edges of the upper shell and the lower shell.

請求項１の本発明では、アッパーシェル部とロアシェル部をそれぞれ別々に金型で射出成形し、アッパーシェル部とロアシェル部の開口周縁部を合体して一体的に接合して形成する。このため、アッパーシェル部とロアシェル部とを別々に射出成形で成形して、寸法精度の高い、強度の強いアッパーシェル部とロアシェル部を得ることができる。また、成形する中空樹脂成形品の形状の自由度が大きく、内部に補強リブや内蔵部品等を取付けることが容易にできる。 In the first aspect of the present invention, the upper shell portion and the lower shell portion are separately injection-molded with a mold, and the opening peripheral portions of the upper shell portion and the lower shell portion are combined and integrally joined. For this reason, the upper shell portion and the lower shell portion can be separately molded by injection molding to obtain a high strength and high strength upper shell portion and lower shell portion. Further, the degree of freedom of the shape of the hollow resin molded product to be molded is large, and it is easy to attach a reinforcing rib, a built-in component, or the like inside.

アッパーシェル部とロアシェル部の開口周縁部の接合面は、それぞれその合成樹脂の融点を大きく上回る温度まで加熱されて溶融された後、相互に溶融状態で接合され、圧接して保持して、溶着される。このため、アッパーシェル部とロアシェル部のそれぞれの開口周縁部を加熱し溶融した溶融状態で圧接して保持することにより接合界面が溶融状態で一体となり、均質な状態とすることができ、冷却固化において開口周縁部を均一で強固に一体的に接合することができる。接着剤等が不要であるため、製造が容易である。 The joint surfaces of the opening peripheral edge of the upper shell portion and the lower shell portion are heated and melted to a temperature substantially exceeding the melting point of the synthetic resin, and then joined to each other in a molten state, held in pressure contact, and welded. Is done. For this reason, it is possible to make the joint interface in a molten state and to be a homogeneous state by heating and holding the respective peripheral edges of the upper shell portion and the lower shell portion in a melted and melted state. The peripheral edge of the opening can be joined uniformly and firmly. Since no adhesive or the like is required, manufacturing is easy.

接合面の温度が、アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度よりも５０℃高い温度（好ましくは３０℃高い温度から）から結晶化開始温度までの間に下がった時点で、圧接の圧接圧よりも高い圧力で開口周縁部を圧接してアッパーシェル部とロアシェル部の開口周縁部を融合した。このため、アッパーシェル部とロアシェル部の開口周縁部において、外側から圧接することにより、さらに接合界面が高密着化して、強固に接合することができる。 When the temperature of the joint surface falls between the temperature of 50 ° C. higher than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion (preferably from a temperature higher by 30 ° C.) to the crystallization start temperature, The opening periphery of the upper shell portion and the lower shell portion were fused by pressing the opening periphery with a pressure higher than the pressure contact pressure. For this reason, in the opening peripheral part of an upper shell part and a lower shell part, by press-contacting from an outer side, a joining interface becomes high contact | adherence further and it can join firmly.

請求項２の本発明は、接合面の温度が、アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度よりも５０℃高い温度から結晶化開始温度の間に下がった時点で、圧接圧よりも高い圧力で開口周縁部を圧縮して、融合された開口周縁部の内面に、内部方向に滑らかに凸状部を形成した中空樹脂成形品の製造方法である。 According to the second aspect of the present invention, when the temperature of the joint surface falls between a temperature higher by 50 ° C. than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion, the pressure contact pressure It is a manufacturing method of the hollow resin molded product which compressed the opening peripheral part with higher pressure and formed the convex-shaped part smoothly in the inner direction on the inner surface of the fused opening peripheral part.

請求項２の本発明では、接合面の温度が、アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度よりも５０℃高い温度（好ましくは３０℃高い温度）から結晶化開始温度までの間に下がった時点で、当初の圧接圧よりも高い圧力で開口周縁部を圧縮して融合された開口周縁部の内面に、内部方向に滑らかに凸状部を形成した。このため、開口周縁部において凸状部の部分だけ溶着面積が広くなり、溶着強度が大きくなる。また、開口周縁部の接合界面の内側先端において、融合しかつ溶融粘度が増大した樹脂を圧縮するため、ノッチ状の凹部を有しなく局部的な溶融樹脂のはみ出しも無く、中空樹脂成形品に衝撃が加わった場合でも、開口周縁部の接合面に衝撃力が集中することが無く、中空樹脂成形品の耐衝撃強度を大きくすることができる。 In the present invention of claim 2, the temperature of the joint surface is from a temperature higher by 50 ° C. (preferably a temperature higher by 30 ° C.) than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion to the crystallization start temperature. At the time when it dropped in between, the convex portion was smoothly formed in the inner direction on the inner surface of the peripheral portion of the aperture that was fused by compressing the peripheral portion of the aperture with a pressure higher than the initial pressure contact pressure. For this reason, the welding area is widened only in the convex portion at the peripheral edge of the opening, and the welding strength is increased. In addition, at the inner tip of the joint interface at the peripheral edge of the opening, the fused and increased melt viscosity resin is compressed, so there is no notch-shaped recess and no local molten resin sticks out, resulting in a hollow resin molded product. Even when an impact is applied, the impact force does not concentrate on the joint surface at the peripheral edge of the opening, and the impact resistance strength of the hollow resin molded product can be increased.

請求項３の本発明は、アッパーシェル部とロアシェル部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部を形成し、フランジ部を相互に圧接して開口周縁部を溶着する中空樹脂成形品の製造方法である。 According to the third aspect of the present invention, each of the opening peripheral portions of the upper shell portion and the lower shell portion forms a flange portion projecting outward at a substantially right angle over the entire periphery, and the flange portions are pressed against each other to form an opening peripheral portion. It is a manufacturing method of the hollow resin molded product which welds a part.

請求項３の本発明では、アッパーシェル部とロアシェル部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、フランジ部を圧接して開口周縁部を溶着する。このため、フランジ部に治具を当てて圧接することにより、アッパーシェル部とロアシェル部の開口周縁部を容易に圧接することができ、アッパーシェル部とロアシェル部の開口周縁を全周にわたり強固に密着させて、均一に溶着することができる。 In the third aspect of the present invention, each of the opening peripheral portions of the upper shell portion and the lower shell portion is formed with a flange portion projecting outward at a substantially right angle over the entire circumference, and the opening peripheral portion is pressed by pressing the flange portion. Weld. For this reason, it is possible to easily press contact the opening peripheral edge of the upper shell part and the lower shell part by applying a jig to the flange part, and firmly tighten the opening peripheral edge of the upper shell part and the lower shell part over the entire circumference. It can be made to adhere and weld uniformly.

請求項４の本発明は、アッパーシェル部とロアシェル部のそれぞれの開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、フランジ部の底面とアッパーシェル部とロアシェル部のそれぞれの開口周縁部の中空樹脂成形品の内面で構成される断面略Ｌ字形の部分をそれぞれ加熱して溶融した後、フランジ部を相互に接合し、圧接して保持し、溶着した中空樹脂成形品の製造方法である。 According to the fourth aspect of the present invention, each of the opening peripheral portions of the upper shell portion and the lower shell portion is formed with flange portions projecting outward at substantially right angles over the entire circumference, and the bottom surface of the flange portion, the upper shell portion, and the lower shell are formed. After heating and melting the substantially L-shaped section composed of the inner surface of the hollow resin molded product at the peripheral edge of each opening, the flanges are joined together, held in pressure contact, and welded hollow It is a manufacturing method of a resin molded product.

請求項４の本発明では、フランジ部の底面とアッパーシェル部とロアシェル部のそれぞれの開口周縁部の内面で構成される断面略Ｌ字形の部分をそれぞれ加熱して溶融した後、フランジ部を相互に接合し、圧接して保持し、溶着した。このため、開口周縁部の全周に亘り内面と接合面とで融合面を確保することができ、開口周縁部の内面に、内部方向に滑らかに凸状部を形成することが容易になる。 According to the fourth aspect of the present invention, after the portions having a substantially L-shaped cross section constituted by the bottom surface of the flange portion and the inner surfaces of the peripheral edge portions of the upper shell portion and the lower shell portion are heated and melted, the flange portions are mutually bonded. And held in pressure contact and welded. For this reason, a fusion surface can be ensured by the inner surface and the joint surface over the entire periphery of the opening peripheral portion, and it becomes easy to form a convex portion smoothly in the inner direction on the inner surface of the opening peripheral portion.

請求項５の本発明は、アッパーシェル部とロアシェル部の射出成形は、ポリオキシメチレン（ＰＯＭ）、高密度ポリエチレン（ＨＤＰＥ）、エチレンビニルアルコール共重合体（ＥＶＯＨ）、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイド（ＰＰＳ）のうち少なくとも１種類の材料を使用して成形する中空樹脂成形品の製造方法である。 According to the present invention of claim 5, the injection molding of the upper shell portion and the lower shell portion is performed using polyoxymethylene (POM), high density polyethylene (HDPE), ethylene vinyl alcohol copolymer (EVOH), nylon, polybutylene terephthalate, polyethylene. This is a method for producing a hollow resin molded product, which is molded using at least one material of terephthalate and polyphenylene sulfide (PPS).

請求項５の本発明では、アッパーシェル部とロアシェル部の射出成形は、ポリオキシメチレン（ＰＯＭ）、高密度ポリエチレン（ＨＤＰＥ）、エチレンビニルアルコール共重合体（ＥＶＯＨ）、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイド（ＰＰＳ）のうち少なくとも１種類の材料を使用して成形する。このため、強度の高い中空樹脂成形品を製造できるとともに、中空樹脂成形品に貯蔵された液体の透過防止性に優れた、液体の透過を防止できる中空樹脂成形品を製造することができる。 In the present invention of claim 5, the injection molding of the upper shell portion and the lower shell portion is performed by polyoxymethylene (POM), high density polyethylene (HDPE), ethylene vinyl alcohol copolymer (EVOH), nylon, polybutylene terephthalate, polyethylene. Molding is performed using at least one material of terephthalate and polyphenylene sulfide (PPS). For this reason, while being able to manufacture a hollow resin molded product having high strength, it is possible to manufacture a hollow resin molded product excellent in the permeation-preventing property of the liquid stored in the hollow resin molded product and capable of preventing liquid permeation.

請求項６の本発明は、アッパーシェル部とロアシェル部の内側樹脂層は、それぞれの開口周縁部が全周に亘りそれぞれ略直角に外側に張り出したフランジ部を有するように、高密度ポリエチレン（ＨＤＰＥ）を使用し射出成形で成形し、射出成形されたアッパーシェル部とロアシェル部の内側樹脂層の外側を、フランジ部を含めて、耐燃料透過性多層樹脂シートで被覆し一体的に接合し、その後、フランジ部を相互に接合し、圧接して保持し、フランジ部において、耐燃料透過性多層樹脂シートの耐燃料透過性を有する層が近接して融合されるようにフランジ部を溶着する中空樹脂成形品の製造方法である。 According to the sixth aspect of the present invention, the inner resin layer of the upper shell portion and the lower shell portion has a high-density polyethylene (HDPE) so that each of the opening peripheral portions has a flange portion projecting outward at a substantially right angle over the entire circumference. ), And the outside of the inner resin layer of the upper shell portion and the lower shell portion that have been injection-molded are covered with a fuel-permeable multilayer resin sheet, including the flange portion, and integrally joined, Thereafter, the flange portions are joined to each other, held in pressure contact, and the flange portions are welded so that the fuel-permeable layers of the fuel-permeable multilayer resin sheet are fused in close proximity to each other in the flange portions. It is a manufacturing method of a resin molded product.

請求項６の本発明では、アッパーシェル部とロアシェル部の内側樹脂層は、それぞれの開口周縁部が全周に亘りそれぞれ略直角に外側に張り出したフランジ部を有するように、高密度ポリエチレン（ＨＤＰＥ）を使用し射出成形で成形している。このため、アッパーシェル部とロアシェル部の内側樹脂層は、高密度ポリエチレン（ＨＤＰＥ）で形成されており、中空樹脂成形品の耐衝撃強度を大きくすることができるとともに、フランジを圧接して、開口周縁部の全周に亘り融合面を確保することができる。 According to the sixth aspect of the present invention, the inner resin layers of the upper shell portion and the lower shell portion have high-density polyethylene (HDPE) so that each opening peripheral edge portion has a flange portion that protrudes outward at a substantially right angle over the entire circumference. ) Is used for injection molding. For this reason, the inner resin layers of the upper shell portion and the lower shell portion are formed of high-density polyethylene (HDPE), which can increase the impact strength of the hollow resin molded product, and press-fitting the flange to open it. A fusion surface can be secured over the entire circumference of the peripheral edge.

射出成形されたアッパーシェル部とロアシェル部の内側樹脂層の外側を、フランジ部を含めて、耐燃料透過性多層樹脂シートで被覆し一体的に接合したため、アッパーシェル部とロアシェル部の内側樹脂層の外側は、フランジ部を含めて、耐燃料透過性多層樹脂シートで被覆されており、中空樹脂成形品の内部に燃料油を入れた場合には、燃料油の透過を防止することができる。多層シートであるため、耐燃料透過性の層のアッパーシェル部とロアシェル部に対向する面に高密度ポリエチレン（ＨＤＰＥ）と接着性の良い層を形成し、外側に耐摩耗性や耐衝撃性の層を形成することができる。 The outer resin layers of the upper shell part and the lower shell part that are injection-molded are covered with a fuel-permeable multilayer resin sheet, including the flange part, and are joined together, so that the inner resin layers of the upper shell part and the lower shell part are joined together. The outer side of this is covered with a fuel permeation-resistant multilayer resin sheet including the flange portion, and when the fuel oil is put inside the hollow resin molded product, the permeation of the fuel oil can be prevented. Because it is a multilayer sheet, high-density polyethylene (HDPE) and a good-adhesion layer are formed on the surface facing the upper shell and lower shell of the fuel-permeable layer, and wear and shock resistance on the outside A layer can be formed.

フランジ部を相互に接合し、圧接して保持し、フランジ部において、耐燃料透過性多層樹脂シートの耐燃料透過性を有する層が近接して融合されるようにフランジ部を溶着している。このため、アッパーシェル部とロアシェル部の内側樹脂層の外側は、フランジ部の先端部分で、耐燃料透過性多層樹脂シートの耐燃料透過性を有する層の相互の隙間が小さく、燃料透過を最小限にすることができる。 The flange portions are joined to each other and held in pressure contact with each other, and the flange portions are welded so that the fuel-permeable layers of the fuel-permeable multilayer resin sheet are fused together in the flange portion. For this reason, the outside of the inner resin layer of the upper shell portion and the lower shell portion is the tip portion of the flange portion, and the gap between the fuel-permeable layers of the fuel-permeable multilayer resin sheet is small, thereby minimizing fuel permeation. Can be limited.

成形されたアッパーシェル部とロアシェル部のそれぞれの開口周縁部が融合されているため、アッパーシェル部とロアシェル部のそれぞれの開口周縁部は強固に一体的に結合しており、アッパーシェル部とロアシェル部の接合強度が大きく、内部に保持された液体の耐透過性を有することができる。
接合面の温度が、アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化開始温度よりも５０℃高い温度（好ましくは３０℃高い温度から）から結晶化温度までの間に下がった時点で、圧接の圧接圧よりも高い圧力で開口周縁部を圧接してアッパーシェル部とロアシェル部の開口周縁部を融合したため、アッパーシェル部とロアシェル部の開口周縁部において、外側から圧接することにより、さらに接合界面が高密着化して、強固に接合することができる。 Since the respective opening peripheral portions of the molded upper shell portion and lower shell portion are fused, the respective opening peripheral portions of the upper shell portion and the lower shell portion are firmly and integrally joined, and the upper shell portion and the lower shell are combined. The joint strength of the portion is high, and the liquid held inside can be resistant to permeation.
When the temperature of the joint surface falls between the crystallization start temperature of 50 ° C. higher than the crystallization start temperature of the synthetic resin constituting the upper shell portion and the lower shell portion (preferably from a temperature higher by 30 ° C.) to the crystallization temperature, Since the opening periphery of the upper shell portion and the lower shell portion are fused by pressing the opening peripheral portion with a pressure higher than the pressure contact pressure of the press contact, by pressing from the outside at the opening peripheral portion of the upper shell portion and the lower shell portion, The bonding interface is highly adhered and can be firmly bonded.

本発明の実施の形態である中空樹脂成形品について、自動車用の燃料タンク１を例にとり、図１〜図６に基づき説明する。本発明は、燃料タンク１以外にも、各種の中空樹脂成形品に使用することができる。
図１は、燃料タンク１の長手方向の断面図であり、図２は、燃料タンク１の幅方向の断面図である。
図３〜図６は、後述する、燃料タンク１の製造方法を示す図である。 A hollow resin molded product according to an embodiment of the present invention will be described with reference to FIGS. The present invention can be used for various hollow resin molded products in addition to the fuel tank 1.
FIG. 1 is a cross-sectional view in the longitudinal direction of the fuel tank 1, and FIG. 2 is a cross-sectional view in the width direction of the fuel tank 1.
3-6 is a figure which shows the manufacturing method of the fuel tank 1 mentioned later.

燃料タンク１は、分割して成形されたアッパーシェル部１０とロアシェル部２０から構成される。アッパーシェル部１０とロアシェル部２０は、それぞれ、射出成形で形成される内側樹脂層１５、２５と、内側樹脂層１５、２５の外側に形成される耐燃料透過性多層樹脂シート３から構成される外側シート層１６、２６の２層から形成される。   The fuel tank 1 includes an upper shell portion 10 and a lower shell portion 20 that are separately formed. The upper shell portion 10 and the lower shell portion 20 are each composed of inner resin layers 15 and 25 formed by injection molding, and a fuel-permeable multilayer resin sheet 3 formed outside the inner resin layers 15 and 25, respectively. The outer sheet layers 16 and 26 are formed from two layers.

後述するように、アッパーシェル部１０とロアシェル部２０は、強度と耐燃料透過性に優れた合成樹脂を使用すれば、外側シート層１６、２６を形成しなくてもよく、内側樹脂層１５、２５のみで構成することができる。
燃料タンク１の分割は２個ばかりでなく３個以上に分割することも可能である。 As will be described later, if the upper shell portion 10 and the lower shell portion 20 are made of a synthetic resin excellent in strength and fuel permeability, the outer sheet layers 16 and 26 may not be formed. 25 can be configured.
The fuel tank 1 can be divided into not only two but also three or more.

アッパーシェル部１０とロアシェル部２０の内面には、複数の内側リブ１７、２７がそれぞれ、燃料タンク１の内部方向に向けて一体的に形成することができる。この内側リブ１７、２７により燃料タンク１の強度・剛性が増加する。またシェルと一体成形した部品取付部８，９に燃料タンク１内に装着する燃料ポンプユニット４や、バルブ６、キャニスター、ホース等を取付けることができる。   A plurality of inner ribs 17 and 27 can be integrally formed on the inner surfaces of the upper shell portion 10 and the lower shell portion 20 toward the inner direction of the fuel tank 1. The inner ribs 17 and 27 increase the strength and rigidity of the fuel tank 1. Further, the fuel pump unit 4 mounted in the fuel tank 1, the valve 6, the canister, the hose and the like can be mounted on the component mounting portions 8 and 9 formed integrally with the shell.

アッパーシェル部１０には、パイプ取付孔２とポンプユニット点検孔５が形成されている。ポンプユニット点検孔５は、燃料タンク１内部に取付けた燃料ポンプユニット４の点検・修理をするための孔であり、パイプ取付孔２は、燃料注入用のパイプ（図示せず）を取付ける孔である。なお、アッパーシェル部１０の上面には、燃料移送用ホース等の各種のホースを保持するホースクランプ（図示せず）を設けてもよい。   A pipe mounting hole 2 and a pump unit inspection hole 5 are formed in the upper shell portion 10. The pump unit inspection hole 5 is a hole for inspecting and repairing the fuel pump unit 4 mounted in the fuel tank 1, and the pipe mounting hole 2 is a hole for attaching a fuel injection pipe (not shown). is there. A hose clamp (not shown) for holding various hoses such as a fuel transfer hose may be provided on the upper surface of the upper shell portion 10.

アッパーシェル部１０とロアシェル部２０の開口の全周には、図２に示すように、アッパーシェル部１０の開口周縁部１１とロアシェル部２０の開口周縁部２１が形成され、その開口周縁部１１、２１には、全周に亘りそれぞれ外面から略直角に外側に張り出したフランジ部１２，２２が形成されている。開口周縁部１１、２１とフランジ部１２，２２は、それぞれ相互に対向して溶着されている。
フランジ部１２，２２は、図２、図５及び図６に示すように、アッパーシェル部１０とロアシェル部２０の本体とは断面略Ｌ字形に形成される。 As shown in FIG. 2, an opening peripheral portion 11 of the upper shell portion 10 and an opening peripheral portion 21 of the lower shell portion 20 are formed on the entire periphery of the opening of the upper shell portion 10 and the lower shell portion 20. , 21 are formed with flange portions 12 and 22 that project outward from the outer surface at substantially right angles over the entire circumference. The opening peripheral edge portions 11 and 21 and the flange portions 12 and 22 are welded to face each other.
As shown in FIGS. 2, 5, and 6, the flange portions 12 and 22 are formed so that the upper shell portion 10 and the main body of the lower shell portion 20 have a substantially L-shaped cross section.

アッパーシェル部１０とロアシェル部２０の内側樹脂層１５の外面は、フランジ７の先端まで耐燃料透過性多層樹脂シート３が一体的に溶着されて、上記の通り、外側シート層１６、２６を構成している。
耐燃料透過性多層樹脂シート３は、例えば、中央の層がエチレンビニルアルコール共重合体（ＥＶＯＨ）又はナイロンで形成された燃料透過を防止するバリヤー層と、そのバリヤー層の上下に変性ポリエチレンから形成される接着層と、その接着層の外面にポリエチレン（ＰＥ）から形成される外層から構成される５層のシートである。 The outer surface of the inner resin layer 15 of the upper shell portion 10 and the lower shell portion 20 is integrally welded with the fuel-permeable multilayer resin sheet 3 up to the tip of the flange 7 to form the outer sheet layers 16 and 26 as described above. is doing.
The fuel permeation-resistant multilayer resin sheet 3 is formed of, for example, a barrier layer for preventing fuel permeation in which a central layer is formed of ethylene vinyl alcohol copolymer (EVOH) or nylon, and modified polyethylene above and below the barrier layer. It is a 5 layer sheet | seat comprised from the outer layer formed from the adhesive layer made and polyethylene (PE) on the outer surface of the adhesive layer.

変性ポリエチレンから形成される接着層は、バリヤー層と外層の両方に対して接着性を有している。このため、バリヤー層と外層を強固に接着することができる。
燃料タンク１の外側の外層は、衝撃や磨耗に強いポリエチレン（ＰＥ）から形成されているので、燃料タンク１の強度を増加させ、バリヤー層を保護することができる。内側樹脂層１５、２５と接合する外層は、内側樹脂層１５、２５がオレフィン系合成樹脂、例えば、高密度ポリエチレン（ＨＤＰＥ）で構成されている場合は、内側樹脂層１５、２５と溶着して、強固に接合されることができる。 The adhesive layer formed from the modified polyethylene has adhesion to both the barrier layer and the outer layer. For this reason, a barrier layer and an outer layer can be adhered firmly.
Since the outer layer outside the fuel tank 1 is made of polyethylene (PE) resistant to impact and wear, the strength of the fuel tank 1 can be increased and the barrier layer can be protected. The outer layer joined to the inner resin layers 15 and 25 is welded to the inner resin layers 15 and 25 when the inner resin layers 15 and 25 are made of an olefin-based synthetic resin, for example, high-density polyethylene (HDPE). Can be firmly joined.

耐燃料透過性多層樹脂シート３をアッパーシェル部１０とロアシェル部２０の内側樹脂層１５、２５に接合する方法を、アッパーシェル部１０を例にとり説明する。ロアシェル部２０の接合方法は、アッパーシェル部１０の接合方法と同様である。
まず、射出成形されたアッパーシェル部１０の内側樹脂層１５を真空成形金型（図示せず）に取付ける。真空成形金型と内側樹脂層１５には多数の小孔が形成されている。 A method of joining the fuel-permeable multilayer resin sheet 3 to the inner resin layers 15 and 25 of the upper shell portion 10 and the lower shell portion 20 will be described by taking the upper shell portion 10 as an example. The joining method of the lower shell portion 20 is the same as the joining method of the upper shell portion 10.
First, the inner resin layer 15 of the injection molded upper shell portion 10 is attached to a vacuum mold (not shown). A large number of small holes are formed in the vacuum molding die and the inner resin layer 15.

次に、耐燃料透過性多層樹脂シート３を加熱して、軟化した耐燃料透過性多層樹脂シート３を真空成形金型に取付けられた内側樹脂層１５の上に置き、真空成形金型から空気を抜き、耐燃料透過性多層樹脂シート３を内側樹脂層１５に密着させる。このとき、耐燃料透過性多層樹脂シート３は、加熱され軟化しているため、内側樹脂層１５の表面の部分と溶融して強固に接合されることができる。
このとき、耐燃料透過性多層樹脂シート３は、開口周縁部１１のフランジ部１２の先端から延設されて接合されているので、フランジ部１２の先端の部分で切除される。 Next, the fuel-permeable multilayer resin sheet 3 is heated, and the softened fuel-permeable multilayer resin sheet 3 is placed on the inner resin layer 15 attached to the vacuum mold, and air is removed from the vacuum mold. The fuel permeation-resistant multilayer resin sheet 3 is brought into close contact with the inner resin layer 15. At this time, since the fuel-permeable multilayer resin sheet 3 is heated and softened, it can be melted and firmly joined to the surface portion of the inner resin layer 15.
At this time, since the fuel-permeable multilayer resin sheet 3 is extended and joined from the front end of the flange portion 12 of the opening peripheral edge portion 11, it is cut off at the front end portion of the flange portion 12.

内側樹脂層１５が射出成形された後に、耐燃料透過性多層樹脂シート３を融着するため、耐燃料透過性多層樹脂シート３を射出成形金型にセットして、裏面側から射出成形する場合と比べて、耐燃料透過性多層樹脂シート３の破れや、強い伸びを防止することができ、燃料透過性が確保できる。また、耐燃料透過性多層樹脂シート３と内側樹脂層１５を一緒に冷却する必要が無く、冷却時間を短くすることができ、生産効率が良い。 When the fuel-permeable multilayer resin sheet 3 is fused after the inner resin layer 15 is injection-molded, the fuel-permeable multilayer resin sheet 3 is set in an injection mold and injection molded from the back side. Compared with the above, it is possible to prevent the fuel-permeable multilayer resin sheet 3 from being torn or to be strongly stretched, and to ensure fuel permeability. Moreover, it is not necessary to cool the fuel-permeable multilayer resin sheet 3 and the inner resin layer 15 together, the cooling time can be shortened, and the production efficiency is good.

次に、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を溶着する方法について説明する。
図３に示すように、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を、隙間を空けて対向させ、その間に熱板３０を置き、開口周縁部１１、２１を全周に亘り加熱する。これにより、開口周縁部１１、２１とフランジ部１２、２２の対向する部分は、軟化することができる。
アッパーシェル部１０とロアシェル部２０が高密度ポリエチレン（ＨＤＰＥ）で構成されている場合は、加熱された開口周縁部１１、２１とフランジ部１２、２２の対向する部分の温度は、２０５℃に加熱した。高密度ポリエチレン（ＨＤＰＥ）の融点は、１３４℃であり、充分融解している。 Next, a method of welding the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell portion 20 will be described.
As shown in FIG. 3, the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell portion 20 are opposed to each other with a gap between them, and a hot plate 30 is placed between them, and the opening peripheral portions 11 and 21 are placed over the entire circumference. Heat. Thereby, the part which the opening peripheral parts 11 and 21 and the flange parts 12 and 22 oppose can be softened.
When the upper shell portion 10 and the lower shell portion 20 are made of high-density polyethylene (HDPE), the temperature of the opposed portions of the heated opening peripheral edge portions 11 and 21 and the flange portions 12 and 22 is heated to 205 ° C. did. The melting point of high density polyethylene (HDPE) is 134 ° C. and is sufficiently melted.

次に、図４に示すように、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１のフランジ部１２、２２をそれぞれ押さえ治具４０で押さえて溶着する。
図４（ａ）は、押さえ治具４０でフランジ部１２、２２を矢印方向に上下から相互に押さえる状態を示す。そして、図４（ｂ）は、開口周縁部１１、２１が１次接合して後に、押さえ治具４０を離し、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を矢印方向に押さえて、保持する状態を示す。また、押さえ治具４０を図の位置で停止させた後アッパーシェル部１０とロアシェル２０の開口周縁部１１、２１を矢印方向につき出しても良い。押さえ治具４０を離したため、開口周縁部１１、２１の放熱を防ぎ、開口周縁部１１、２１の溶融部の熱の拡散により軟化領域を維持拡大でき、接合界面の融合を促進することができる。 Next, as shown in FIG. 4, the flange portions 12 and 22 of the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell portion 20 are respectively pressed and welded by the pressing jig 40.
FIG. 4A shows a state in which the flange portions 12 and 22 are pressed against each other from above and below by the pressing jig 40 in the arrow direction. 4B, after the opening peripheral portions 11 and 21 are primarily joined, the pressing jig 40 is released, and the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell portion 20 are pressed in the direction of the arrow. The state to be held is shown. Further, after the holding jig 40 is stopped at the position shown in the drawing, the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell 20 may be provided in the direction of the arrow. Since the holding jig 40 is released, heat dissipation of the opening peripheral edge portions 11 and 21 can be prevented, and the softened region can be maintained and expanded by diffusion of heat at the melted portion of the opening peripheral edge portions 11 and 21, thereby promoting fusion of the bonding interfaces. .

次に、２次圧着について説明する。
開口周縁部１１、２１の軟化領域を維持拡大して、構成する合成樹脂の結晶化温度よりも５０℃高い温度、好ましくは３０℃高い温度から結晶開始化温度までの間に下がった時点で、図４（ｃ）に示すように、押さえ治具４０でフランジ部１２、２２を矢印方向に、図４（ａ）のときよりも大きな圧力で上下に圧縮する。そのとき、図４（ｄ）に示すように、フランジ部１２、２２の合成樹脂は固化していないため、開口周縁部１１、２１の界面付近で矢印に示すように燃料タンク１の内部方向に移動する。 Next, the secondary pressure bonding will be described.
Maintaining and expanding the softened regions of the opening peripheral edge portions 11 and 21, when the temperature falls from a temperature higher by 50 ° C. than the crystallization temperature of the synthetic resin to be formed, preferably from a temperature higher by 30 ° C. to the crystal initiation temperature, As shown in FIG. 4 (c), the pressing jig 40 compresses the flange portions 12 and 22 in the direction of the arrow in a vertical direction with a pressure larger than that shown in FIG. 4 (a). At that time, as shown in FIG. 4 (d), since the synthetic resin of the flange portions 12 and 22 is not solidified, in the vicinity of the interface between the opening peripheral portions 11 and 21, the inner direction of the fuel tank 1 is indicated by the arrow. Moving.

さらに、図４（ｅ）に示すように、押さえ治具４０で上下に押さえ続けると、合成樹脂は、開口周縁部１１、２１の界面付近で矢印に示すように燃料タンク１の内部方向に移動して、燃料タンク１の内部方向に滑らかに突出した山形の凸状部１３が形成される。これは、開口周縁部１１、２１とフランジ部１２、２２の合成樹脂が、溶融状態で一体的に融合した後に、溶融温度低下による高粘度領域で燃料タンク１の内部方向に押し出されるため、界面部分にノッチ状の凹部を形成することなく、緩やかに裾野を引いたような山形の凸状部１３を形成することができるためである。
アッパーシェル部１０とロアシェル部２０が高密度ポリエチレン（ＨＤＰＥ）で構成されている場合は、２次圧着は１４０℃で開始した。結晶化ピーク温度は１１２℃であり、結晶化開始温度は１２１℃であるため、開口周縁部１１、２１は、燃料タンク１の内部方向に滑らかに突出した山形の凸状部１３が形成された。 Further, as shown in FIG. 4 (e), when the pressing jig 40 is continuously pressed up and down, the synthetic resin moves toward the inside of the fuel tank 1 as indicated by an arrow in the vicinity of the interface between the opening peripheral portions 11 and 21. Thus, a mountain-shaped convex portion 13 that protrudes smoothly in the internal direction of the fuel tank 1 is formed. This is because the synthetic resin of the opening peripheral edge portions 11 and 21 and the flange portions 12 and 22 are integrally fused in a molten state and then pushed out toward the inside of the fuel tank 1 in a high-viscosity region due to a decrease in melting temperature. This is because it is possible to form the convex portion 13 having a mountain shape with a gently skirted portion without forming a notch-shaped concave portion.
When the upper shell portion 10 and the lower shell portion 20 are made of high density polyethylene (HDPE), the secondary pressure bonding was started at 140 ° C. Since the crystallization peak temperature is 112 ° C. and the crystallization start temperature is 121 ° C., the opening peripheral edge portions 11 and 21 are formed with mountain-shaped convex portions 13 projecting smoothly in the internal direction of the fuel tank 1. .

開口周縁部１１、２１の融合された内面は、山形の内部方向に滑らかな凸状部１３を有するため、開口周縁部１１，２１において溶着面積が広くなり、溶着強度が大きくなる。また、開口周縁部１１、２１の接合面の内側先端である凸状部１３において、ノッチ状の凹部を有しないため、燃料タンク１に衝撃が加わった場合でも、開口周縁部１１，１２の接合面に衝撃力が集中することが無く、燃料タンク１の耐衝撃強度を大きくすることができる。 Since the inner surface where the opening peripheral portions 11 and 21 are fused has the smooth convex portion 13 in the inner direction of the mountain shape, the welding area is widened at the opening peripheral portions 11 and 21, and the welding strength is increased. Further, since the convex portion 13 which is the inner tip of the joint surface of the opening peripheral portions 11 and 21 does not have a notch-shaped concave portion, even when an impact is applied to the fuel tank 1, the joint of the open peripheral portions 11 and 12 is achieved. The impact force does not concentrate on the surface, and the impact strength of the fuel tank 1 can be increased.

次に、開口周縁部１１、２１のフランジ部１２の別の形状について、図５に基づき、アッパーシェル部１０を例にとり説明する。ロアシェル部２０の形状は、アッパーシェル部１０の形状と同様である。
フランジ部１２に先端にアッパーシェル部１０の側壁に沿って平行に、図５における上方にフランジ部凸部１２ａを形成する。図５（ａ）に示すように、フランジ部凸部１２ａによりアッパーシェル部１０の側壁との間に溝１２ｂを形成することができる。そして、図５（ｂ）に示すように、この溝１２ｂに押さえ治具４０の先端をはめ込んで、熱板３０に接触させフランジ部１２を溶融する。また、熱板３０は略Ｌ字型でフランジ部１２の内面側も同時に溶融する。その後に、ロアシェル部２０のフランジ部２２と相互に圧着して、図５（ｃ）に示すように、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を溶着する。 Next, another shape of the flange portion 12 of the opening peripheral edge portions 11 and 21 will be described based on FIG. 5 by taking the upper shell portion 10 as an example. The shape of the lower shell portion 20 is the same as the shape of the upper shell portion 10.
A flange portion convex portion 12a is formed at the top of the flange portion 12 in parallel with the side wall of the upper shell portion 10 at the top in FIG. As shown in FIG. 5A, the groove 12 b can be formed between the flange portion convex portion 12 a and the side wall of the upper shell portion 10. And as shown in FIG.5 (b), the front-end | tip of the pressing jig 40 is engage | inserted in this groove | channel 12b, it is made to contact with the hot plate 30, and the flange part 12 is fuse | melted. Moreover, the hot plate 30 is substantially L-shaped, and the inner surface side of the flange portion 12 is melted at the same time. Thereafter, the flange portion 22 of the lower shell portion 20 is pressure-bonded to each other, and the upper shell portion 10 and the opening peripheral portions 11 and 21 of the lower shell portion 20 are welded as shown in FIG.

このようにして、フランジ部凸部１２ａと溝１２ｂにより押さえ治具４０を固定することができ、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を相互に強く圧接させることができ、強固に溶着することができる。また、フランジ部１２のタンク内面側も溶融するため内面側に裾野が広いゆるやかな山型凸形状を形成でき、溶着部周辺まで強度を大きくできる。アッパーシェル部１０とロアシェル部２０は、強度が大きく、耐燃料透過性に優れた合成樹脂を使用すれば、アッパーシェル部１０とロアシェル部２０とフランジ部１２、２２には、耐燃料透過性多層樹脂シート３を設けなくても良い。 In this way, the holding jig 40 can be fixed by the flange convex portion 12a and the groove 12b, and the opening peripheral portions 11 and 21 of the upper shell portion 10 and the lower shell portion 20 can be strongly pressed against each other, It can be firmly welded. Further, since the inner surface side of the tank of the flange portion 12 is also melted, a gentle mountain-shaped convex shape having a wide skirt can be formed on the inner surface side, and the strength can be increased to the periphery of the weld portion. If the upper shell portion 10 and the lower shell portion 20 are made of a synthetic resin having high strength and excellent fuel permeation resistance, the upper shell portion 10, the lower shell portion 20, and the flange portions 12 and 22 have a fuel permeation-resistant multilayer. The resin sheet 3 may not be provided.

なお、アッパーシェル部１０とロアシェル部２０に耐燃料透過性多層樹脂シート３を使用しない場合に、使用する耐燃料油性の熱可塑性合成樹脂は、例えば、ポリオキシメチレン（ＰＯＭ）、高密度ポリエチレン（ＨＤＰＥ）、エチレンビニルアルコール共重合体（ＥＶＯＨ）、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイドのうち少なくとも１種類の材料を使用することができる。 When the fuel-permeable multilayer resin sheet 3 is not used for the upper shell portion 10 and the lower shell portion 20, the fuel oil-resistant thermoplastic synthetic resin used is, for example, polyoxymethylene (POM), high-density polyethylene ( HDPE), ethylene vinyl alcohol copolymer (EVOH), nylon, polybutylene terephthalate, polyethylene terephthalate, and polyphenylene sulfide can be used.

次に、開口周縁部１１、２１のフランジ部１２の先端に耐燃料透過性多層樹脂シート３を若干延設する別の形状について、図６に基づき、アッパーシェル部１０を例にとり説明する。ロアシェル部２０のフランジ部２２の形状は、アッパーシェル部１０の形状と同様である。
アッパーシェル部１０のフランジ部１２の外側は、耐燃料透過性多層樹脂シート３がアッパーシェル部１０の本体から連続して被覆して、外側シート層１６を形成している。 Next, another shape in which the fuel-permeable multilayer resin sheet 3 is slightly extended at the distal ends of the flange portions 12 of the opening peripheral portions 11 and 21 will be described with reference to FIG. 6 by taking the upper shell portion 10 as an example. The shape of the flange portion 22 of the lower shell portion 20 is the same as the shape of the upper shell portion 10.
On the outer side of the flange portion 12 of the upper shell portion 10, the fuel-permeable multi-layer resin sheet 3 is continuously covered from the main body of the upper shell portion 10 to form an outer sheet layer 16.

外側シート層１６の先端は、図６（ａ）に示すように、フランジ部１２の先端からさらに延設されて、フランジ外側シート層１８となっている。そして、図６（ｂ）に示すように、押さえ治具４０によりフランジ部１２の外側シート層１６とフランジ外側シート層１８とを熱板３０に接触させフランジ部１２とフランジ外側シート層１８とを溶融する。その後に、ロアシェル部２０のフランジ部２２と相互に圧着して、図６（ｃ）に示すように、アッパーシェル部１０とロアシェル部２０の開口周縁部１１、２１を溶着する。 The front end of the outer sheet layer 16 is further extended from the front end of the flange portion 12 to form a flange outer sheet layer 18 as shown in FIG. Then, as shown in FIG. 6B, the outer sheet layer 16 and the flange outer sheet layer 18 of the flange portion 12 are brought into contact with the hot plate 30 by the holding jig 40 so that the flange portion 12 and the flange outer sheet layer 18 are brought into contact with each other. Melt. Thereafter, the flange portion 22 of the lower shell portion 20 is pressure-bonded to each other, and the upper shell portion 10 and the opening peripheral portions 11 and 21 of the lower shell portion 20 are welded as shown in FIG.

このとき、アッパーシェル部１０のフランジ外側シート層１８とロアシェル部２０のフランジ外側シート層２８は、ともに熱板３０で溶融され、押さえ治具４０で相互に圧接される。このため、フランジ外側シート層１８，２８の耐燃料透過性多層樹脂シート３の内部にある耐燃料透過性の層が互いに接近して、溶着される。従って、耐燃料透過性の層の間隔が狭くなり、この層の間から燃料が透過することを防止でき、フランジ部１２、２２の間からの透過を最小限にすることができる。 At this time, the flange outer sheet layer 18 of the upper shell portion 10 and the flange outer sheet layer 28 of the lower shell portion 20 are both melted by the hot plate 30 and pressed against each other by the holding jig 40. For this reason, the fuel permeation-resistant layers inside the fuel permeation-resistant multilayer resin sheet 3 of the flange outer sheet layers 18 and 28 come close to each other and are welded. Therefore, the space | interval of a fuel-permeable-proof layer becomes narrow, it can prevent that a fuel permeate | transmits from between this layer, and can permeate | transmit between the flange parts 12 and 22 to the minimum.

また、図５の実施の形態と同様に、開口周縁部１１、２１のフランジ部１２，２２およびその内面側も、Ｌ字状熱板３０で溶融されたため、融合されたフランジ部１２，２２の内面は、山形の内部方向に滑らかな凸状部１３を形成することができる。このため、開口周縁部１１，２１において溶着面積が広くなり、溶着強度が大きくなる。また、開口周縁部１１、２１の接合面の内側先端である凸状部１３において、ノッチ状の凹部を有しないため、燃料タンク１に衝撃が加わった場合でも、開口周縁部１１，１２の接合面に衝撃力が集中することが無く、燃料タンク１の耐衝撃強度を大きくすることができる。 Similarly to the embodiment of FIG. 5, the flange portions 12 and 22 of the opening peripheral edge portions 11 and 21 and the inner surface side thereof are also melted by the L-shaped hot plate 30, so that the fused flange portions 12 and 22 The inner surface can form a smooth convex portion 13 in the inner direction of the chevron. For this reason, a welding area becomes large in the opening peripheral parts 11 and 21, and welding strength becomes large. Further, since the convex portion 13 which is the inner tip of the joint surface of the opening peripheral portions 11 and 21 does not have a notch-shaped concave portion, even when an impact is applied to the fuel tank 1, the joint of the open peripheral portions 11 and 12 is achieved. The impact force does not concentrate on the surface, and the impact strength of the fuel tank 1 can be increased.

本発明の実施の形態である燃料タンクの長手方向の断面図である。It is sectional drawing of the longitudinal direction of the fuel tank which is embodiment of this invention. 本発明の実施の形態である燃料タンクの幅方向の断面図である。It is sectional drawing of the width direction of the fuel tank which is embodiment of this invention. 本発明の実施の形態である燃料タンクのアッパーシェル部とロアシェル部の開口周縁部を熱板で溶融する状態の断面模式図である。It is a cross-sectional schematic diagram of the state which fuse | melts the opening peripheral part of the upper shell part and lower shell part of a fuel tank which is embodiment of this invention with a hot platen. 本発明の実施の形態であるアッパーシェル部とロアシェル部のフランジ部を溶着する工程を示す断面模式図である。It is a cross-sectional schematic diagram which shows the process of welding the upper shell part and flange part of a lower shell part which are embodiment of this invention. 本発明の他の実施の形態であるアッパーシェル部とロアシェル部のフランジ部を溶着する他の工程を示す断面模式図である。It is a cross-sectional schematic diagram which shows the other process of welding the flange part of the upper shell part which is other embodiment of this invention, and a lower shell part. 本発明の他の実施の形態であるアッパーシェル部とロアシェル部のフランジ部を溶着する工程を示す断面模式図である。It is a cross-sectional schematic diagram which shows the process of welding the flange part of the upper shell part and lower shell part which are other embodiment of this invention. 従来のアッパーシェル部とロアシェル部のフランジ部を溶着する工程を示す模式図である。It is a schematic diagram which shows the process of welding the flange part of the conventional upper shell part and a lower shell part.

符号の説明Explanation of symbols

１ 燃料タンク
１０ アッパーシェル部
１１、２１ 開口周縁部
１２、２２ フランジ部
１３ 凸状部
１５、２５ 内側樹脂層
１６、２６ 外側シート層
１８、２８ フランジ外側シート層
３０ 熱板
４０ 押さえ治具 DESCRIPTION OF SYMBOLS 1 Fuel tank 10 Upper shell part 11, 21 Opening peripheral part 12, 22 Flange part 13 Convex part 15, 25 Inner resin layer 16, 26 Outer sheet layer 18, 28 Flange outer sheet layer 30 Hot plate 40 Holding jig

Claims (6)

アッパーシェル部とロアシェル部をそれぞれ別々に金型で射出成形し、上記アッパーシェル部とロアシェル部の開口周縁部を合体して一体的に接合して形成する熱可塑性合成樹脂製の中空樹脂成形品の製造方法において、
上記アッパーシェル部とロアシェル部の開口周縁部の接合面は、それぞれその合成樹脂の融点を大きく上回る温度で加熱されて溶融された後、相互に溶融状態で接合され、圧接して保持し、
上記接合面の温度が、上記アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度よりも５０℃高い温度から結晶化開始温度までの間に下がった時点で、上記圧接の圧接圧よりも高い圧力で上記開口周縁部を圧縮して上記アッパーシェル部とロアシェル部の上記開口周縁部を溶着したことを特徴とする中空樹脂成形品の製造方法。 A hollow resin molded product made of a thermoplastic synthetic resin formed by injection-molding the upper shell portion and the lower shell portion separately with a mold, and joining the upper peripheral edge portion of the upper shell portion and the lower shell portion and integrally joining them. In the manufacturing method of
The joint surfaces of the opening peripheral edge portions of the upper shell portion and the lower shell portion are heated and melted at a temperature that greatly exceeds the melting point of the synthetic resin, and then joined together in a molten state and held in pressure contact with each other.
When the temperature of the joint surface falls between a temperature higher by 50 ° C. than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion to the crystallization start temperature, it is higher than the pressure contact pressure of the pressure contact. A method for producing a hollow resin molded product, comprising compressing the peripheral edge of the opening with high pressure and welding the peripheral edge of the opening of the upper shell portion and the lower shell portion. 上記接合面の温度が、上記アッパーシェル部とロアシェル部を構成する合成樹脂の結晶化温度より５０℃高い温度から結晶化開始温度までの間に下がった時点で、上記圧縮圧よりも高い圧力で上記開口周縁部を圧縮して、融合された上記開口周縁部の内面の接合界面に、上記中空樹脂成形品の内部方向に滑らかに凸状部を形成した請求項１に記載の中空樹脂成形品の製造方法。 When the temperature of the joint surface falls between a temperature higher by 50 ° C. than the crystallization temperature of the synthetic resin constituting the upper shell portion and the lower shell portion to a crystallization start temperature, the pressure is higher than the compression pressure. The hollow resin molded product according to claim 1, wherein the peripheral edge of the opening is compressed and a convex portion is smoothly formed in the inner direction of the hollow resin molded product at the joint interface of the inner surfaces of the fused peripheral edge of the opening. Manufacturing method. 上記アッパーシェル部とロアシェル部のそれぞれの上記開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部を形成し、該フランジ部を相互に圧接して上記開口周縁部を溶着する請求項１又は請求項２に記載の中空樹脂成形品の製造方法。 Each of the opening peripheral portions of the upper shell portion and the lower shell portion forms a flange portion projecting outward at a substantially right angle over the entire circumference, and the flange peripheral portions are pressed against each other to weld the opening peripheral portion. The manufacturing method of the hollow resin molded product of Claim 1 or Claim 2. 上記アッパーシェル部とロアシェル部のそれぞれの上記開口周縁部は、全周に亘りそれぞれ略直角に外側に張り出したフランジ部が形成され、該フランジ部の底面と上記アッパーシェル部とロアシェル部のそれぞれの上記開口周縁部の上記中空樹脂成形品の内面で構成される断面略Ｌ字形の部分をそれぞれ加熱して溶融した後、上記フランジ部を相互に接合し、圧縮して保持し、溶着した請求項１乃至請求項３のいずれかに記載の中空樹脂成形品の製造方法。 Each of the opening peripheral portions of the upper shell portion and the lower shell portion is formed with flange portions projecting outward at substantially right angles over the entire circumference, and each of the bottom surface of the flange portion, the upper shell portion, and the lower shell portion. Claims wherein the flanges are joined to each other, compressed, held, and welded after heating and melting each of the substantially L-shaped sections formed on the inner surface of the hollow resin molded product at the peripheral edge of the opening. The manufacturing method of the hollow resin molded product in any one of Claim 1 thru | or 3. 上記アッパーシェル部とロアシェル部の射出成形は、ポリオキシメチレン（ＰＯＭ）、高密度ポリエチレン（ＨＤＰＥ）、エチレンビニルアルコール共重合体（ＥＶＯＨ）、ナイロン、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリフェニレンサルファイド（ＰＰＳ）のうち少なくとも１種類の材料を使用して成形する請求項１乃至請求項４のいずれかに記載の中空樹脂成形品の製造方法。 The injection molding of the upper shell portion and the lower shell portion includes polyoxymethylene (POM), high density polyethylene (HDPE), ethylene vinyl alcohol copolymer (EVOH), nylon, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide (PPS). The manufacturing method of the hollow resin molded product in any one of Claims 1 thru | or 4 shape | molded using at least 1 type of material. 上記アッパーシェル部とロアシェル部の内側樹脂層は、それぞれの上記開口周縁部が全周に亘りそれぞれ略直角に外側に張り出したフランジ部を有するように、高密度ポリエチレン（ＨＤＰＥ）を使用し射出成形で成形し、射出成形された上記アッパーシェル部とロアシェル部の内側樹脂層の外側を上記フランジ部を含めて、耐燃料透過性多層樹脂シートで被覆し一体的に接合し、その後、上記フランジ部を相互に接合し、圧縮して保持し、上記フランジ部において、上記耐燃料透過性多層樹脂シートの耐燃料透過性を有する層が近接して溶着されるように上記フランジ部を溶着する請求項１乃至請求項５のいずれかに記載の中空樹脂成形品の製造方法。 The inner resin layer of the upper shell portion and the lower shell portion is injection-molded using high-density polyethylene (HDPE) so that each of the peripheral edge portions of the opening has a flange portion extending outward at a substantially right angle over the entire circumference. The outer shell portion and the lower shell portion of the inner resin layer formed by injection molding are covered with a fuel-permeable multilayer resin sheet, including the flange portion, and integrally joined, and then the flange portion The flange portion is welded so that the fuel permeation-resistant layer of the fuel permeation-resistant multilayer resin sheet is welded close to the flange portion. A method for producing a hollow resin molded product according to any one of claims 1 to 5.
JP2006350000A 2006-12-26 2006-12-26 Manufacturing method of hollow resin molded product Withdrawn JP2008155587A (en)

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WO2010027205A2 (en) * 2008-09-03 2010-03-11 (주)모야 Hollow injection-molded material and joining method for the same
WO2010027205A3 (en) * 2008-09-03 2010-06-24 (주)모야 Hollow injection-molded material and joining method for the same
WO2012066649A1 (en) * 2010-11-17 2012-05-24 愛三工業株式会社 Fuel tank and method for producing same
US9181902B2 (en) 2010-11-17 2015-11-10 Aisan Kogyo Kabushiki Kaisha Fuel tank and method for producing same
WO2014082980A1 (en) * 2012-11-28 2014-06-05 Kautex Textron Gmbh & Co. Kg Unstationary container and method for the production thereof
CN105599836A (en) * 2014-11-17 2016-05-25 铃木株式会社 Fuel tank and manufacturing method thereof
JP2016101894A (en) * 2014-11-28 2016-06-02 トヨタ自動車株式会社 Manufacturing method of fuel tank
CN104816142A (en) * 2015-04-17 2015-08-05 成都泰盟软件有限公司 Technology for machining biological functioning experimental equipment shell
US11903674B2 (en) 2015-08-10 2024-02-20 Nec Corporation Mount, authentication device, authentication method, and program
KR101880549B1 (en) * 2017-01-13 2018-08-16 주식회사 동희산업 Urea water tank for vehicle
JP2022050888A (en) * 2020-09-18 2022-03-31 八千代工業株式会社 Fuel tank and fuel tank manufacturing method
JP7304331B2 (en) 2020-09-18 2023-07-06 八千代工業株式会社 FUEL TANK AND FUEL TANK MANUFACTURING METHOD

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