JP4625303B2 - Production method of paper container with partition - Google Patents

Description

  The present invention relates to a method for producing a partition paper container that is suitably used as a lunch box, an insole container for a lunch box, and other containers such as a tray.

Water resistance that has a resin layer such as polyethylene or polyester on the inner surface of paper as an insole container for lunch boxes and lunch boxes, instead of plastic or metal containers, so that disposal such as recycling and incineration can be performed easily A paper container with a partition such as a paper composite tray having a large area has been widely used (for example, see Patent Document 1).
Japanese Utility Model Publication No. 61-14437

  The partitioned paper container described in Patent Document 1 is obtained by compression molding a cardboard having a surface laminated with a plastic film such as polyethylene or polypropylene. This partition paper container is formed into an irregular shape by compression molding a cardboard laminated with a plastic film, but the cardboard having a plastic film after compression molding may return to its original shape. In this case, the shape retention was low and the yield was poor.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a partitioned paper container capable of manufacturing a partitioned paper container with a high yield.

In order to achieve the above object, a method for manufacturing a paper container for partitioning according to the present invention includes a roll paper having a thermoplastic resin layer provided on one surface forming the inner side of a molded product via a feed roller. It is sent to one upper surface of a plurality of molded female molds provided on a rotatable index table at intervals in the circumferential direction, and heated steam is sprayed on the other surface different from the side on which the thermoplastic resin layer is provided. The entire roll paper is heated and softened, and then compressed and molded using a molding male mold in the softened state, and the roll paper is cut simultaneously with or before and after the compression molding, the detached from the roll paper to cool the molded article after creating a compression molded moldings, edging cut the by rotating the index table by moving the molding female mold with the molded article molded article With the Hare, and wherein the moving the separate molding female to the position of the forming male.

According to this invention, when the roll paper is compression-molded, the entire roll paper is in a softened state, and the entire roll paper does not attempt to return to the shape before compression molding by cooling after compression molding. Will be better. In addition, by heating the roll paper by spraying heated steam on the other side of the roll paper different from the side on which the thermoplastic resin layer is provided, the amount of moisture in the roll paper increases. Since it becomes easy to extend, the quality of a molded article improves. Therefore, it becomes possible to manufacture a high-quality partitioned paper container with a high yield.

In the method for manufacturing a partition paper container according to the present invention, the compression-molded molded product is cooled while being moved to the edge cut in a state of being positioned in the molded female mold. To do . Moreover, in the manufacturing method of the paper container with a partition which concerns on this invention, the said molded article after the said border cutting is adsorb | sucked by suction | inhalation, and it conveys from the said index table.

Moreover, in the manufacturing method of the paper container for partition according to the present invention for achieving the above object, a paper base material provided with a thermoplastic resin layer on one side forming the inner side of the molded product is placed at a heating position. After transporting and spraying heated steam on the other surface different from the side on which the thermoplastic resin layer is provided, the entire paper substrate is heated and softened, and then the upper surface of the molding female mold of the compression molding machine. The paper base material is compressed and molded using a male mold while the paper base is softened , and the molded product is cooled in a female mold, and the cooled molded product is molded into a metal mold. The mold is moved on a belt conveyor using a moving device, and the molding female mold has a sensor for detecting the paper base, a stopper for determining a stop position of the paper base, and a lifting member for the molded product. It is characterized by using an installed one .

According to this invention, when the paper base material is compression-molded, the entire paper base material is in a softened state, and by cooling after compression molding , the entire paper base material does not attempt to return to the shape before compression molding. , Shape retention is improved. Also, when the paper base is heated by spraying heated steam on the other side of the paper base that is different from the side where the thermoplastic resin layer is provided, the water content of the paper base increases. In addition, since the paper base is easily stretched, the quality of the molded product is improved. Therefore, it becomes possible to manufacture a high-quality partitioned paper container with a high yield.

  In the method for manufacturing a paper container for partition according to the present invention, it is preferable that the molded article is sucked by suction and conveyed from the upper surface of the female mold.

In the method for manufacturing a partitioned paper container according to the present invention, the cooling of the molded product is performed by ejecting air from the female molding die while the molded product is placed in the female molding die. And

  As described above, according to the method for manufacturing a partitioned paper container according to the present invention, the entire paper is made of thermoplastic resin in order to spray heated steam on the other surface different from the side on which the thermoplastic resin layer is provided. The temperature is softened to such an extent that the layer does not break, the spreadability is improved, and it is easy to compress with a press mold. In addition, it has an excellent effect on shape retention after molding. The container can be manufactured with high yield.

  Hereinafter, the manufacturing method of the paper container for partitions based on this invention is explained in full detail based on an accompanying drawing.

  FIG. 1 is a schematic configuration diagram showing an example of an apparatus for carrying out the first method for manufacturing a paper container for partition according to the present invention. FIG. 2 is a schematic sectional view showing an example of roll paper according to the present invention. FIG. 3 is a view for explaining an example of the first method for manufacturing a paper container for partition according to the present invention. As shown in FIGS. 1 to 3, the first method for manufacturing a paper container with a partition according to the present invention is a roll paper in which a thermoplastic resin layer 4 is provided on one surface forming the inside of a molded product 5. 1 is sent to one upper surface of a plurality of female molds 7 provided on a rotatable index table 6 via a feed roller, and heated steam is applied to the other surface different from the side on which the thermoplastic resin layer 4 is provided. After the roll paper is heated and softened, the roll paper 1 is compression-molded using the molding male mold 8 in the softened state, and at the same time as or before and after the compression molding. And forming the molded product 5 separated from the roll paper 1 and compression-molded, and then rotating the index table 6 to move the molded female die 7 together with the molded product 5. Characterized by performing edging cut That.

  The partition-made paper container that is the molded product 5 is not particularly limited, and examples thereof include a lunch box, an insole container for a lunch box, and other containers such as a tray. The shape of the partition paper container is not particularly limited. In the embodiment of the present invention, the description will be made without limiting to the lunch box, the insole container for the lunch box, the tray or the like as the partition paper container.

  The roll paper 1 is formed by providing a thermoplastic resin layer 4 on a paper base 3. The paper base 3 is not particularly limited as long as it is used in a lunch box, an insole container for a lunch box, a paper container with a partition such as a tray, for example, 100% pulp, It may contain a resin and impart rigidity, water resistance, and hot water resistance. Examples of the paper base 3 include a paper base made of 100% natural pulp, cardboard, and the like.

  A thermoplastic resin layer 4 is provided on one surface of the paper base 3 that forms the inside of the molded product 5. The thermoplastic resin layer 4 is provided in order to provide characteristics such as shape retention and water resistance. The thermoplastic resin constituting the thermoplastic resin layer 4 is not particularly limited, and examples thereof include polyolefin resins such as polypropylene resin, polyethylene resin, polyethylene terephthalate resin, polyethylene naphthalate resin, and modified polyolefin resin, and polyacrylonitrile. Examples thereof include resins, polyvinyl chloride, ethylene-vinyl acetate copolymers, polyamides, polystyrenes, polycarbonates, and polyvinyl alcohols. The thickness of the thermoplastic resin layer 4 is not particularly limited, and can be arbitrarily determined according to the thermoplastic resin or the paper base material. For example, a range of 0.010 μm to 0.015 μm is desirable.

  The thermoplastic resin layer 4 is provided by, for example, laminating, and the laminating method is not particularly limited, and examples thereof include a dry laminating method, an extruder sand laminating method, a coextrusion laminating method, and a wet laminating method.

  A roll paper 1 is obtained by laminating the thermoplastic resin layer 4 on a belt-like paper base material 3, and a roll body 2 is obtained by winding the roll paper 1 in a roll shape. For example, the roll body 2 is rotatably supported by a support member (not shown) so that the roll paper 1 can be drawn from the roll body 2. At this time, the roll paper 1 drawn out from the roll body 2 is drawn out from the roll body 2 so that the thermoplastic resin layer 4 is positioned upward, for example. Of course, depending on the molding method to be described later, the opposite may be considered.

  A pair of feed rollers is provided in front of the roll body 2 in the pulling direction of the roll paper 1. In the pair of feed rollers, both rollers or one of the rollers, for example, a roller in contact with the thermoplastic resin layer 4 (also referred to as the first roller 11) is driven to rotate while the roll paper 1 is sandwiched. It is configured. The roll paper 1 is pulled out from the roll body 2 by the rotation of the first roller 11.

  A cutting blade 15 extending in the axial direction is provided on the peripheral surface of the first roller 11, and the roll paper 1 is pulled out from the roll body 2 and is cut by the cutting blade 15. That is, the roll paper 1 is cut by the cutting blade 15 every time the first roller 11 rotates once. For this reason, the length which cuts the roll paper 1 can be set to a desired dimension by changing the diameter (actually the circumferential length) of the first roller 11.

  The diameter of the remaining rollers (sometimes referred to as the second roller 12) is not particularly limited, and may be formed with the same size as the diameter of the first roller 11, or the diameter of the first roller 11 as illustrated. It may be formed with smaller dimensions. Although the cutting blade 15 is provided on the first roller 11, it may be provided on the second roller 12, or may be provided on both rollers 11, 12. Further, the cutting blade 15 is provided on the first roller 11 to cut the roll paper 1, but a cutting device is provided near the front of the pair of the first roller 11 and the second roller 12 in the drawing direction of the roll paper 1. It may be provided to cut the roll paper 1. In this case, the first roller is not provided with a cutting blade.

  An index table 6 is rotatably provided in front of the pair of first roller 11 and second roller 12 in the drawing direction of the roll paper 1. The index table 6 is formed in a disk shape, for example. The index table 6 is rotatably supported by a machine frame (not shown) or the like, and is intermittently driven in one direction or both directions by a rotation driving device (not shown) provided with a motor or the like.

  On the index table 6, two or more molded female dies 7 in the illustrated example are provided at equal intervals in the circumferential direction, for example. The forming female die 7 is arranged on the index table 6 so that the roll paper 1 drawn out by the pair of first roller 11 and second roller 12 is placed thereon. That is, when the roll paper 1 is drawn from the roll body 2 onto the forming female die 7 and cut by the cutting blade 15 of the first roller 11, it is placed on the forming female die 7.

  The molding male mold 8 is movable above the index table 6 and above the movement trajectory of the molding female mold 7, for example, above the placement position where the roll paper 1 is placed on the molding female mold 7. Is provided. The forming male mold 8 is formed by compression-molding the roll paper 1 into a predetermined shape with the forming female mold 7. A mold lifting / lowering device 35 for moving the molding male mold 8 up and down is attached to the molding male mold 8.

  In addition, for example, when one molding female mold 7 is positioned at the mounting position above the index table 6, the molding female mold 7 is adjacent to the molding female mold 7 and the index table 6 is rotated. A cutting member 41 is movably provided above the cutting position where the forming female die 7 in the front direction is located. The cut member 41 abuts the molded female die 7 and cuts the edge of the molded product 5 created by compression molding placed on the molded female die 7. A cut member moving device 45 for moving the cut member 41 up and down is attached to the cut member 41.

  In addition, when two female molds out of the three molded female molds 7 are positioned at the placement position and the cutting position above the index table 6, the remaining one molded female mold 7 is positioned. Above the unloading position, an adsorbing part 51 for adsorbing the molded product 5 on the female mold 7 by suction is provided. The adsorption part 51 is connected to an exhaust device (not shown) such as a vacuum pump or an exhaust pump, and the molded product 5 can be adsorbed by sucking air from the adsorption unit 51 by driving the exhaust device. Yes. A suction part moving device 55 for moving the suction part 51 up and down and horizontally is attached to the suction part 51. The adsorbing part 51 that adsorbs the molded product 5 is moved by the adsorbing part moving device 55 from the forming female die 7 to the vicinity of the index table 6, for example, on the belt conveyor 60 to adsorb the molded product 5 adsorbed. It can be transported upward. In addition, although it comprised so that the adsorption | suction part 51 might be provided separately and the molded article 5 might be conveyed, the molded article 5 created by providing an adsorption | suction part in the cut member 41 and cutting an edge is made to adsorb | suck to the adsorption | suction part, for example You may make it convey on a belt conveyor. Further, the molded product 5 is sucked and transported onto the belt conveyor 60 using the suction portion 51. If the molded product 5 can be transported, the molded product 5 is gripped and transported by other means such as gripping. You may do it.

  Steam ejection portions 71 are respectively provided on both sides in the width direction of the band-shaped paper of the formed female die 7 that is positioned in the front position in the drawing direction of the roll paper 1 of the second roller 12. The steam ejection part 71 heats the entire area in the width direction or substantially the entire area of the surface opposite to the thermoplastic resin layer 4 of the roll paper 1 drawn from the pair of first roller 11 and second roller 12 onto the forming female die 7. The roll paper 1 is heated by spraying steam. The heating of the roll paper 1 is to soften the thermoplastic resin layer 4 so that the temperature is higher than the softening temperature and lower than the melting temperature. Although it will not specifically limit as heating steam if the roll paper 1 can be heated, For example, what contains 30% or more of water | moisture content is preferable. When the water content is 30% or more, the roll paper 1 is not easily compressed and the roll paper 1 is not torn when the roll paper 1 is compression-molded. The temperature of the heating steam is arbitrarily determined according to the thermoplastic resin layer 4 and the paper base material 3. For example, when the thermoplastic resin layer 4 is a polypropylene resin, it is 100 ° C to 130 ° C, preferably 200 ° C. When the heated paper is sprayed on the roll paper 1 to heat the roll paper 1, the thermoplastic resin layer 4 is heated to about 150 ° C.

  Note that the steam is blown onto the roll paper 1 before being cut by the cutting blade 15 of the first roller 11 by the steam jetting unit 71 to heat the roll paper 1, but the roll paper 1 cut by the cutting blade 15 is used. The roll paper 1 may be heated by spraying steam. Further, although the steam ejection portions 71 are provided on both sides in the width direction of the strip of the forming female die 7 positioned at the loading position, the roll paper is provided in the vicinity of the second roller 12 in front of the roll paper 1 in the drawing direction. A thermoplastic resin of the roll paper 1 that is drawn out from the pair of first roller 11 and second roller 12 onto the formed female die 7 by providing a steam ejection portion so as to extend in one width direction (including substantially the width direction). The roll paper 1 may be heated by spraying steam over the entire width direction or substantially the entire area of the surface opposite to the layer 4. Further, the steam ejection part 71 and the second roller 12 obstruct the movement of the forming female mold 7 when the index table 6 is rotated in FIG. 1, but FIG. 1 shows the steam ejection part 71 and the second roller 12. The position is shown for easy understanding.

  A cooling device 80 for cooling the molded product 5 formed by compression molding is provided in the vicinity of the placement position of the index table 6 or between the placement position when the index table 6 rotates and the cut position. Preferably it is. Further, the cooling device 80 may be provided in each of the formed female dies 7. The cooling device 80 cools the molded product 5 created by compression molding so that the thermoplastic resin layer 4 of the molded product 5 is below its softening temperature. The cooling device 80 is not particularly limited as long as the molded product 5 can be cooled. For example, the cooling device 80 may cool the molded product 5 by blowing air.

  Next, the manufacturing method of the 1st paper container made from a partition which concerns on this invention using the apparatus shown in FIG. 1 is demonstrated.

  After the roll body 2 is rotatably supported by the support member, the free end portion of the roll paper 1 from the roll body 2 is drawn out between the first roller 11 and the second roller 12 as shown in FIG. Then, the roll paper 1 is sandwiched between the first roller 11 and the second roller 12. When the forming female mold 7 is not present at the mounting position, the index table 6 is rotated by the rotation driving device to position any one of the three forming female molds 7 at the mounting position.

  The first roller 11 is driven to rotate and the roll paper 1 is pulled out from the roll body 2 and sent to the upper surface of the forming female die 7. When the first roller 11 is driven to rotate, heated steam is blown from the steam ejection portion 71 toward the roll paper 1 drawn out by the first roller 11 and the second roller 12, and the roll paper 1 is heated to form a paper base material. 3 is softened, and the thermoplastic resin layer 4 is softened at a temperature higher than the softening temperature and lower than the melting temperature. In this softened state, the mold lifting / lowering device 35 is driven to lower the molding male mold 8 toward the molding female mold 7, and the roll paper 1 is compression molded by the molding male mold 8 and the molding female mold 7 (FIG. 3). (See (b)). The compression molding time varies depending on the thermoplastic resin layer 4 and the paper base material 3. For example, when polypropylene resin is used as the thermoplastic resin layer 4 and 100% pulp is used as the paper base material 3, the compression molding time is 2 seconds. It is. The heating of the roll paper 1 is not limited to when the roll paper 1 is sent onto the forming female mold 7 by the pair of first roller 11 and second roller 12, but before and after cutting after being sent onto the forming female mold 7. But you can. Further, the cutting of the roll paper 1 is not limited to before compression molding, and may be performed simultaneously with compression molding (including substantially simultaneous) or after compression molding.

  After the compression molding, the molded male mold 8 is separated from the molded female mold 7, and then air is blown from the cooling device 80 to the molded product 5 to cool the thermoplastic resin layer 4 of the molded product 5 below the softening temperature (FIG. 3 (c). )reference). After cooling, the index table 6 is rotated by the rotation drive device to move the molded product 5 to the cut position. After the movement, the cut member 41 is lowered by the cut member moving device 45 toward the molded product 5 on the molded female die 7 to cut the edge of the molded product 5 (see FIG. 3D).

  Then, the index table 6 is rotated by the rotation driving device to move the molded product 5 to the carry-out position. After the movement, the exhaust device is driven to suck air from the suction portion 51 and the suction portion moving device 55 is driven to bring the suction portion 51 into contact with or close to the molded product 5. Thereby, the molded product 5 is adsorbed by the adsorption part 51 by the suction force of the adsorption part 51. The adsorbing part 51 that adsorbs the molded product 5 is moved from the forming female die 7 by the adsorbing part moving device 55 (see FIG. 3E) and then conveyed onto the belt conveyor 60 (see FIG. 3F). ). Thereby, the molded product 5 can be sent to other processes, such as an inspection process and a boxing process.

  In addition, three molding female molds 7 are provided on the index table 6, and these molding female molds 7 can be sequentially moved to the placement position, the cutting position, and the unloading position by the rotation of the index table 6. The molded product 5 can be manufactured continuously. That is, when the roll paper 1 is moved together with the forming female die 7 to the cutting position, another forming female die 7 is located at the mounting position, so that the first roller 11 is driven to rotate in the same manner as described above. The roll paper 1 is pulled out from the roll body 2 and cut and placed on the forming female die 7, and the steam ejection section 71 is driven to heat the roll paper 1 with steam. That is, simultaneously with drawing the roll paper 1 from the roll body 2 onto the forming female die 7, the roll paper 1 is heated, and the thermoplastic resin layer 4 of the roll paper 1 is at or above the softening temperature and below the melting temperature. To the temperature. In this state, the molding male mold 8 is moved by the mold lifting device 35, and compression molding is performed by the molding male mold 8 and the molding female mold 7. After the compression molding, the molded product 5 is cooled by the cooling device 80. Thereby, since the compression molding and cooling of another roll paper 1 can be performed when the cut of the molded product 5 is performed, the molded product 5 can be manufactured continuously.

  Therefore, in the first method for manufacturing a paper container according to the present invention, when the roll paper 1 is compression-molded, the entire roll paper 1 is in a softened state. Since there is no attempt to return to the previous shape, the shape-retaining property is improved, and a partitioned paper container can be manufactured with a high yield.

  Moreover, since the thermoplastic resin layer 4 is formed in the shape after compression molding by cooling the molded product 5 and making the thermoplastic resin layer 4 below the softening temperature, the thermoplastic resin layer 4 is compression molded. Since the later shape is maintained, the shape retaining property is further improved, and a partitioned paper container can be manufactured with a higher yield.

  Further, since steam is blown onto the surface of the roll paper 1 opposite to the thermoplastic resin layer 4, that is, the paper base material 3, the water content of the paper base material 3 increases, so that the paper base material 3 is easily stretched. As a result, when the roll paper 1 is compression-molded, the paper base material 3 is prevented from being easily stretched and broken, so that the quality of the molded product 5 is improved and the yield is improved. Therefore, it is possible to manufacture a high-quality partitioned paper container with a high yield. Further, by heating the roll paper 1 by spraying steam, the heating of the roll paper 1 and the application of moisture to the paper base 3 can be performed simultaneously, so that the heating device and the moisture application device are provided separately. The size can be reduced and the cost can be reduced.

  FIG. 4 is a schematic configuration diagram showing an example of an apparatus for carrying out the second method for producing a paper container for partition according to the present invention. As shown in FIG. 4, the second method for manufacturing a paper container with a partition is formed by placing a paper base 103 having a thermoplastic resin layer 4 on one surface forming the inside of a molded product 5 at a heating position. The paper substrate 103 is heated and softened by spraying heated steam on the other surface different from the side on which the thermoplastic resin layer 4 is provided, and then the paper substrate 103 is formed on the upper surface of the molding die 107. The molded article 5 is produced by compression molding using the molding male mold 108 while the paper base material 103 is softened. In addition, the same name is attached | subjected to the same member as the manufacturing method of the said 1st paper packaging container, and the description may be abbreviate | omitted.

  The paper base material 103 is made of the same material as the paper base material 3 and is formed in a shape when compression molding is performed. As this paper base material 103, the roll paper 1 may be cut to an arbitrary length, or a paper base material 103 of an arbitrary size provided with a thermoplastic resin layer 4 (see FIG. 2). But you can.

  A plurality of paper base materials 103 having the thermoplastic resin layer 4 are placed on the paper feed belt 111 in a stacked state. The paper feed belt 111 is an endless conveyor belt. The paper feed belt 111 is stretched around a drive roller 112 and a driven roller 113, and the paper base belt 103 placed on the paper feed belt 111 is circulated and driven by the drive roller 112. Is conveyed to the drive roller 112 side. Above the paper feed belt 111 in the vicinity of the drive roller 112, a regulating member 115 is provided so as to be movable up and down. The regulating member 115 is provided with a gap through which only one sheet of the base material 103 passes between the regulating member 115 and the sheet feeding belt 111. Further, a conveying roller 117 is provided above the driving roller 112 of the paper feeding belt 111. The transport roller 117 feeds one sheet of the base material 103 that has been fed onto the drive roller 112 onto the guide part 121 in the forward direction of the paper feed belt 111. For example, the transport roller 117 is rotationally driven by a driving roller 118 via a belt 119.

  The guide part 121 is one in which the paper substrate 103 moves on the upper surface, and is formed in a flat plate shape, for example. It is preferable that the upper surface of the guide part 121 is formed of a material having at least low frictional resistance. Moreover, it is preferable that the guide part 121 is provided with a rod-shaped or L-shaped guide member (not shown) for moving the paper base material 103 without shifting the paper base material 103 in the width direction. A penetrating portion (not shown) corresponding to a portion excluding both sides of the paper base material 103 is provided in the middle of the guide base 121 in the moving direction of the paper base material 103. The position where this penetration part is provided is the heating position. Below the penetrating portion, a steam spraying device 125 that blows heated steam toward the penetrating portion is provided. In addition, the guide part 121 is not limited to a flat plate shape, and may be one in which two rod-shaped members are installed.

  A plurality of guide rollers 123 are provided above the guide part 121 to send the paper base material 103 sent on the guide part 121 to the compression molding machine 130 by being sandwiched between the guide part 121. Of these guide rollers 123, those other than the heating position are not particularly limited as to where they contact the paper substrate 103. It is preferable that the guide roller 123 at the heating position is provided on both sides of the penetrating part and conveys both side parts of the paper base material 103 at the heating position by sandwiching with the guide part 121. That is, the guide roller 123 at the heating position performs both functions of conveying the paper base material 103 and pressing the paper base material 103 when heated steam is blown.

  The compression molding machine 130 compresses and forms the paper base material 103 with a molding female mold 107 and a molding male mold 108. The forming female mold 107 is provided on the machine base 131, and the paper base material 103 is conveyed to the upper surface of the forming female mold 107. A stopper 133 is provided in the vicinity of an end portion of the forming female die 107 in front of the paper base 103 in the conveying direction so as to appear and retract. The stopper 133 stops the conveyance of the paper substrate 103 when the conveyed paper substrate 103 comes into contact with the stopper, and positions the paper substrate 103 on the upper surface of the forming female die 107. Further, the molding female die 107 is provided with a lifting member 135 that can lift and lower the molded product 5 produced by compression molding from the upper surface of the molding female die 107. The formed female mold 107 is provided with a sensor 136 that detects the position of the paper base 103, the molded product 5 and the like on the formed female mold 107. The sensor 136 detects, for example, the position of the paper substrate 103 or the like from the length with which the contact 136a contacts.

  The molding male mold 108 is attached to a mold lifting / lowering device 138. The mold lifting device 138 is attached to a machine casing 139 fixed to the machine base 131. The mold lifting / lowering device 138 compresses and molds the paper base material 103 into a predetermined shape using the molding male mold 108 and the molding female mold 107, and moves the molding male mold 108 up and down.

  In the vicinity of the compression molding machine 130, a molded product conveying means 150 for conveying the molded product 5 on the molded female die 107 is provided. The molded product conveying means 150 is not particularly limited as long as the molded product 5 on the molded female die 107 can be conveyed. For example, the molded product 5 may be sucked and conveyed by suction of an adsorption portion (not shown). . The adsorption unit is provided in the moving device 151, for example. The moving device 151 horizontally moves the moving member 152 so that the tip portion is positioned in the vicinity of the forming female die 107, and an adsorption portion is provided at the tip portion of the moving member 152. An exhaust device (not shown) such as a vacuum pump or an exhaust pump is connected to the moving device 151, and air is sucked from the suction portion by driving the exhaust device to suck the molded product 5 on the molding female die 107. Can be done. The moving member 152 that has adsorbed the molded product 5 can move and transport the molded product 5 from the molding female die 107 to, for example, the belt conveyor 160 disposed in the vicinity of the compression molding machine 130. ing.

  Moreover, it is preferable that a cooling device (not shown) for cooling the molded product 5 formed by compression molding is provided in the compression molding machine 130 or in the vicinity thereof. The cooling device cools the molded product 5 created by compression molding so that the thermoplastic resin layer 4 of the molded product 5 is below its softening temperature. The cooling device is not particularly limited as long as the molded product 5 can be cooled. For example, the cooling device may cool the molded product 5 by blowing air.

  Next, the manufacturing method of the 2nd paper container made from a partition which concerns on this invention using the apparatus shown in FIG. 4 is demonstrated.

  A plurality of paper base materials 103 are placed on the paper feed belt 111 in a stacked state. At this time, the surface on which the thermoplastic resin layer 4 is provided is made upward. The drive roller 112 is driven to run the paper feed belt 111. Then, only the lowermost paper substrate 103 of the plurality of paper substrates 103 placed on the paper feeding belt 111 by the regulating member 115 is fed above the driving roller 112 of the paper feeding belt 111. At this time, the conveying roller 117 is rotated by the driving roller 118 via the belt 119. Thereby, the paper base material 103 is sent onto the guide part 121.

  The paper roller 103 is moved along the guide part 121 by rotating the guide roller 123. The paper base material 103 reaches the heating position while moving the guide part 121. At this time, the steam spraying device 125 sprays heated steam to the paper base material 103 through the penetrating portion, heats the paper base material 103 to soften the paper base material 103, and softens the thermoplastic resin layer 4. Above and soften below the melting temperature. In this softened state, the paper base material 103 is fed onto the forming female die 107 by the guide roller 123. At this time, by causing the stopper 133 to protrude from the forming female mold 107, the conveyed paper base material 103 comes into contact with the stopper 133 to stop the conveyance and is placed on the upper surface of the forming female mold 107. Positioned. As described above, since the stopper 133 is provided, the paper base material 103 can be reliably positioned on the upper surface of the forming female die 107. The spraying of the heating steam may be in a state where the paper base material 103 is stopped at the heating position as long as the paper base material 103 and the thermoplastic resin layer 4 can be softened. You may go while doing it.

  The molding male mold 108 is lowered toward the molding female mold 107 by the mold lifting device 138 while the paper base 103 and the thermoplastic resin layer 4 are in the softened state, and the paper base is formed by the molding male mold 108 and the molding female mold 107. The molded product 5 is created by compression molding 103. The compression molding time varies depending on the thermoplastic resin layer 4 and the paper base material 103. For example, when polypropylene resin is used as the thermoplastic resin layer 4 and 100% pulp is used as the paper base material 103, the compression molding time is 2 seconds. It is. When the paper base material 103 is compression-molded, the sensor 136 detects whether the paper base material 103 is positioned on the forming female mold 107, thereby positioning the paper base material 103 on the forming female mold 107. The paper base material 103 can be surely compressed and molded. It is also possible to detect whether or not the paper base material 103 is compression-molded and formed as the molded product 5.

  After the compression molding, the molded product 5 is cooled by a cooling device. After cooling, the exhaust device is driven to suck air from the suction portion, and the moving device 152 is horizontally moved by the moving device 151 so that the suction portion at the tip of the moving member 152 is positioned in the vicinity of the forming female die 107. . Thereby, the molded product 5 is adsorbed by the adsorption part by the suction force of the adsorption part. At this time, the molded product 5 can be reliably adsorbed to the adsorption portion by moving the lifting member 135 up and down to float the molded product 5 from the upper surface of the female mold 107. Further, by detecting whether or not the molded product 5 is positioned on the molded female mold 107 by the sensor 136, the molded product 5 is reliably conveyed when the molded product 5 is positioned on the molded female mold 107. Yes.

  The adsorbing portion that adsorbs the molded product 5 is conveyed from the forming female die 107 to the belt conveyor 160 by the moving device 151 via the moving member 152. By driving the belt conveyor 160, the molded product 5 is sent to another process, for example, a cutting process, and the edge of the molded product 5 is cut by a tooth profile or a laser cut.

  Therefore, in the second method for manufacturing a paper container with a partition according to the present invention, when the paper base material 103 is compression-molded, the entire paper base material 103 is in a softened state. However, since the shape does not tend to return to the shape before compression molding, the shape retaining property is improved, and the partitioned paper container can be manufactured with a high yield.

  Moreover, since the thermoplastic resin layer 4 is formed in the shape after compression molding by cooling the molded product 5 and making the thermoplastic resin layer 4 below the softening temperature, the thermoplastic resin layer 4 is compression molded. Since the later shape is maintained, the shape retaining property is further improved, and a partitioned paper container can be manufactured with a higher yield.

  Further, since steam is blown onto the surface of the paper base 103 on the side opposite to the thermoplastic resin layer 4, the water content of the paper base 103 increases, so that the paper base 103 is easily stretched. As a result, when the paper base material 103 is compression-molded, the paper base material 103 is prevented from being easily stretched and broken, so that the quality of the molded product 5 is improved and the yield is improved. Therefore, it is possible to manufacture a high-quality partitioned paper container with a high yield. Also, by heating the paper base material 103 by spraying steam, the paper base material 103 can be heated and the water content can be applied to the paper base material 103 at the same time. Compared to this, the size can be reduced and the cost can be reduced.

  Since the partition-made paper container can be manufactured with high yield as described above, the paper lunch box can be manufactured with high yield. That is, using the above-described first and second method for manufacturing a paper container with a partition, for example, as shown in FIG. 5, an outer box 501 having an inner partition 505, an inner box 502 for storing foods, and a lid 503 is created.

  The outer box 501 is not particularly limited, and may have any shape such as a rectangular shape, a circular shape, an elliptical shape, a triangular shape, or a polygonal shape, and is formed in a rectangular shape, for example. Further, the outer box 501 may have a middle partition 505 or may not have the middle partition 505. The food-containing storage inner box 502 is stored in the outer box 501, and the shape thereof is not particularly limited, and examples thereof include a rectangular shape, a circular shape, an elliptical shape, a triangular shape, and a polygonal shape. The food-containing storage boxes 502 include, for example, a first food-specific storage box 511 formed in an elongated rectangular shape and a second food-specific storage box 512 formed in a rectangular shape. Two third boxes for accommodating foodstuffs 513 formed in a rectangular shape and having an inner partition 513a are composed of a total of four.

  These four food-containing storage boxes 511, 512, 512, and 513 are stored in the outer box 501, and the outer box 501 is covered with a lid 503, whereby a paper lunch box 500 is produced. be able to. In this lunch box 500, an outer box 501, an inner box 511, 512, 512, 513 and a lid 503 for containing foods are prepared by using the aforementioned first and second methods for manufacturing a paper container with a partition. Therefore, it can be manufactured with good quality and high yield.

  As described above, the method for manufacturing a partitioned paper container according to the present invention can manufacture a high quality partition paper container with a high yield, such as a lunch box, an insole container for a lunch box, a tray, etc. It is suitably used as a method for manufacturing other containers.

It is a schematic block diagram which shows an example of the apparatus for enforcing the manufacturing method of the 1st partition paper-made container which concerns on this invention. It is a schematic sectional drawing which shows an example of the roll paper which concerns on this invention. It is a figure for demonstrating the manufacturing method of the 1st paper-made container with a partition which concerns on this invention. It is a schematic block diagram which shows an example of the apparatus for enforcing the manufacturing method of the 2nd paper container made from a partition which concerns on this invention. 1 is a perspective view showing an example of a paper lunch box according to the present invention.

DESCRIPTION OF SYMBOLS 1 Roll paper 2 Roll body 3 Paper base material 4 Thermoplastic resin layer 5 Molded product 6 Index table 7 Molding female die 8 Molding male die 11 1st roller 12 2nd roller 15 Cutting blade 35 Mold raising / lowering device 41 Cut member 45 Cut Member moving device 51 Adsorbing portion 60 Belt conveyor 71 Steam jetting portion 80 Cooling device 103 Paper base material 107 Molding female die 108 Molding male die 111 Paper feed belt 112 Drive roller 113 Followed roller 115 Restricting member 117 Conveying roller 121 Guide portion 123 Guide roller DESCRIPTION OF SYMBOLS 125 Steam spraying apparatus 130 Compression molding machine 138 Mold raising / lowering apparatus 150 Molded article conveyance means 151 Moving apparatus 152 Moving member 160 Belt conveyor 500 Lunch box 501 Outer box 502 Inner box 503 by foodstuff

Claims (6)

Formed female provided with a plurality of roll papers, which are provided with a thermoplastic resin layer on one side forming the inner side of a molded product, on an index table that can be rotated via a feed roller with a circumferential interval. Sending to one upper surface of the mold, spraying heated steam on the other surface different from the side where the thermoplastic resin layer is provided to heat and soften the entire roll paper, and then use the molded male mold in this softened state Then, the roll paper is cut at the same time as the compression molding or before and after the compression molding, and the molded product is separated from the roll paper and formed into a compression molded product, and then the molded product is cooled. , wherein rotating the index table to move the forming female mold with said molded articles in conjunction with performing border cutting the molded article to move the another molding female to the position of the forming male The method for producing a partition with paper containers. 2. The partitioned paper container according to claim 1, wherein the compression-molded molded product is cooled while being moved to the edge cut position in a state of being located in the molded female mold . Production method.   The method for producing a paper container for partition according to claim 1 or 2, wherein the molded product after the edging cut is sucked by suction and conveyed from the index table. A paper base material provided with a thermoplastic resin layer on one side forming the inner side of the molded product is conveyed to a heating position, and heated steam is sprayed on the other side different from the side on which the thermoplastic resin layer is provided. After heat-softening the entire paper base material, the paper base material is transported to the upper surface of a molding female mold of a compression molding machine , and the paper base material is compressed and molded using a molding male mold in a softened state. The molded product is cooled in a female mold, the cooled molded product is moved from the molding die on a belt conveyor using a moving device, and the molded female mold includes the paper What is claimed is: 1. A method for manufacturing a partition paper container , comprising: a sensor for detecting a base material; a stopper for determining a stop position of the paper base material; and a lifting member for the molded product .   The method for producing a paper container for partition according to claim 4, wherein the molded article is sucked by suction and conveyed from the upper surface of the female mold. 5. The partitioned paper container according to claim 4, wherein cooling of the molded product is performed by ejecting air from the molded female mold in a state where the molded product is placed in the molded female mold. Manufacturing method.

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