JP2018075806A - Method for manufacturing synthetic resin container and synthetic resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a synthetic resin container integrally molded with a cushiony handle on an outer surface of a container body made of a hard resin, and also provide the synthetic resin container.SOLUTION: The method for manufacturing a synthetic resin container comprises: an insert part arrangement step for arranging a cushioned handle 2 molded beforehand in a mold 6 as an insert part using an insert 3 in a state that a fusion-bonding portion 21 thereof is faced to the inside of the mold 6; a container molding step in which, following the previous step, after a parison P is supplied into the mold 6 and the mold 6 is clamped, the parison P is blown through an extraction port 12 and the parison and the insert part 2 are fusion-bonded together. Before the insert part arrangement step, a counter pressure member 5 that supports the fusion-bonding portion 21 of the insert part 2 from its back and counteracts the blowing pressure imposed via the parison P is fitted to the insert part 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a synthetic resin container manufacturing method and a synthetic resin container.

  For transportation and storage of kerosene and drinking water, a synthetic resin container generally called a polytank as disclosed in Patent Document 1, for example, is widely used. This type of container generally has a capacity of 10 to 25 liters, especially 18 liters or 20 liters. Such a large-capacity container used for transportation and storage is usually provided with a handle on the container body for convenient transportation, and the handle is generally formed by integral molding with the container body. It is.

  Since the container thus configured has a large capacity as described above, the container body is formed of a hard resin having excellent strength. Therefore, the handle integrally molded with the container body is naturally made of a hard resin. For this reason, when the container is transported, if the container is lifted by holding the handle, the weight is concentrated on the finger through the handle, especially when the contents are full, the handle is I couldn't keep holding the container because it hurt.

  Regarding such a problem, for example, in Patent Document 2, although the reagent container has a different form from the above-described container, the band-shaped handle attached to the container body has elasticity so as to protrude from the edge of the handle. A solution means is disclosed in which a sheet-like protective member is provided, the load applied to the finger is reduced by the elasticity of the protective member, and the handle is prevented from biting into the finger.

Japanese Utility Model Publication No. 53-115414 JP 2012-224391 A

  Although it is conceivable to apply the solution disclosed in Patent Document 2 to the container disclosed in Patent Document 1, attaching the protective members separately from the container handle one by one This is extremely cumbersome and causes an increase in manufacturing cost, which is economically disadvantageous. In addition, containers such as plastic tanks are generally stored outdoors and may be stacked, so that the protective member may deteriorate over time and come off the handle.

  The present invention has been made in view of such points, and the object thereof is to produce a synthetic resin container in which a handle having cushioning properties is integrally formed on the outer surface of a container body made of hard resin and its The object is to provide a synthetic resin container.

  In order to achieve the above object, the present invention is configured as follows.

  A synthetic resin container manufacturing method according to the present invention includes a hard resin container body having at least one extraction port, and a soft resin cushion having at least one grip opening and provided on the outer surface of the container body. A synthetic resin container manufacturing method for manufacturing a synthetic resin container provided with a handle having a property by blow molding, with the pre-molded handle as an insert part and its fusion part facing the mold An insert part placement step for placing the mold in the mold in parallel with the supply direction of the parison formed in the container body using a nest, and after the insert part placement step, the parison is fed into the mold and the mold And a container forming step of blowing the parison through the extraction port and fusing the parison and the insert part together. Prior to the component placement step, supporting the fusion part of the insert component from behind, and mounting a pressure-resistant member against the pressure of the blow received through the parison on the insert component. Features.

  By such a specific matter, a synthetic resin container in which a handle having a cushioning property is provided on the outer surface of a container body made of hard resin can be manufactured by integral molding.

  In addition, since the pressure-resistant member is mounted on the insert part (handle) and the fused part of the insert part is supported from behind, the fused part is deformed by receiving the pressure of the blow when the parison is blown. Is prevented. Accordingly, there is no risk of a decrease in strength at the fused portion between the container main body and the handle, and deformation on the handle mounting side of the container main body does not occur, so that the aesthetic appearance of the entire container is not impaired.

  Further, in the synthetic resin container manufacturing method described above, in the insert part arranging step, a nest presser support material that resists the pressure of the blow received through the parison is mounted in the gap between the nest and the inner surface of the mold. May be.

  In this case, since it is not necessary to give strength to the nesting itself, for example, a light metal such as aluminum can be used, and operations such as attaching the nesting to the mold or removing it from the molded product are facilitated.

  The synthetic resin container according to the present invention is formed by integrally forming a handle having a cushioning property and made of at least one soft resin having a grip opening on the outer surface of a hard resin container body having at least one extraction port. Is.

  According to this, when the container is lifted by grasping the handle when transporting the container, even if the contents are full and heavy and the weight is concentrated on the fingers through the handle, Since the handle itself has a cushioning property, it is difficult for the handle to bite into fingers, and unlike the conventional container, there is no pain and the container cannot be held. Therefore, it is easy to carry even when it is heavy.

  Here, the hard resin used for the container body may be the same as that of a conventional container, and a polyethylene resin, particularly a high-density polyethylene resin is preferable, but is not limited thereto, and examples thereof include a polypropylene resin. . In addition, these are illustrations, Comprising: As long as the rigidity as a container can be ensured, other hard resin may be sufficient.

  On the other hand, the soft resin used for the handle may be any resin that exhibits cushioning properties that allow the fingers to feel elasticity when gripped. For example, low-density polyethylene resin or EVA (Ethylene Vinyl Acetate Copolymer) resin, Or an olefin type thermoplastic elastomer resin etc. are mentioned. Note that these are examples, and other soft resins may be used as long as the cushioning property suitable for the handle can be ensured, but those having excellent fusion properties with the resin of the container body are employed. The

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the synthetic resin container by which the handle which has cushioning properties is integrally molded by the outer surface of the container main body made from hard resin, and its synthetic resin container can be provided.

It is a perspective view of the synthetic resin container which concerns on this invention. It is a disassembled perspective view which shows the insert components (handle) used for the manufacturing method of the synthetic resin container of this invention, a nest | insert, a pressure-resistant member, and a nest | insert presser support material. It is a perspective view which shows the middle of assembling the insert component (handle) shown in FIG. 2, a nest | insert, and a pressure-resistant member. It is a perspective view which omits a metal mold | die and shows the state which assembled the insert component (handle) shown in FIG. 2, the nest | insert, the pressure-resistant member, and the nest | insert pressing support material. It is a cross-sectional view which shows the state which set the insert component (handle) shown in FIG. 2, the nest | insert, the pressure-resistant member, and the nest | insert presser support material in the metal mold | die.

  Hereinafter, after describing the synthetic resin container which concerns on this embodiment first about the embodiment which concerns on this invention, the manufacturing method of this synthetic resin container is demonstrated.

[Description of Synthetic Resin Container According to this Embodiment]
The synthetic resin container according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a perspective view of a synthetic resin container according to the present invention.

  In the synthetic resin container 1 according to this embodiment, the container body 10 is a substantially rectangular parallelepiped, has an extraction port 12 near one end of the top surface 11, and three handles 2 are juxtaposed along the longitudinal direction of the top surface 11. It has been done. In addition, regarding the handle 2, in the following description, when the handle located at both ends of the top surface 11 and the handle located at the center of the top surface 11 are described separately, alphabets are added to the symbols of the handles, respectively. (2A, 2B, etc.).

  The container body 10 has a capacity of, for example, 18 liters to 20 liters, and is molded from a hard resin. The hard resin may be the same as that of a conventional container, and a polyethylene resin, particularly a high-density polyethylene resin is preferable, but is not limited thereto, and examples thereof include a polypropylene resin. In addition, these are illustrations, Comprising: As long as the rigidity as a container can be ensured, other hard resin may be sufficient.

  The handle 2 includes a fusion part 21 to be fused to the container body 10, a pair of support parts 22 formed from the vicinity of both ends of the fusion part 21, and an upper end part of the support part 22. And an installed grip portion 23. The fusion part 21 is slightly wider than the grip part 23, and is designed so that the peripheral edge of the fusion part 21 is locked to the opening edge on the inner surface side of the handle insertion hole 31 of the insert 3 described later. Yes. The space surrounded by the fusion part 21, the grip part 23, and both support parts 22, 22 is a grip opening 24 that allows passage of fingers, and faces the grip opening 24 of the grip part 23. The surface is formed into a corrugated surface 25 that fits in with fingers when the grip portion 23 is gripped. Moreover, the grip part 23 is made into the overhang part 26 which the both ends protrudes on the outer side of the support | pillar part 22, respectively. Furthermore, the support column 22 is formed with a through hole 22a through which a connecting rod (not shown) used for connecting the handles 2 is inserted. In addition, the overhang part 26 of the grip part 23 is provided on the design, and is not necessarily provided.

  The shape of the fusion bonding part 21 is different between a handle 2 </ b> A provided at both side edges of the top surface 11 of the container body 10 and a handle 2 </ b> B provided at the center of the top surface 11.

  That is, the fusion part 21A of the handle 2A includes a concave fusion surface 21Aa (see FIG. 2) corresponding to the curved surfaces on both side edges of the top surface 11, a planar upper surface 21Ab facing the grip part 23, and a fusion surface. A convex outer surface 21Ac similar to the landing surface 21Aa, an end surface 21Ad joined to each end edge of the fusion surface 21Aa, the upper surface 21Ab, and the outer surface 21Ac, and the back surface of the upper surface 21Ab and the surface of the outer surface 21Ac And a recess 21Ae surrounded by the back sides of the pair of end faces 21Ad. As shown in FIG. 2, the surface of the outer surface 21Ac is provided with a plurality of recesses 21Af along the longitudinal direction thereof, and corresponding protrusions 21Ag are provided on the fusion surface 21Aa. . Although not shown in the drawing, a pair of reinforcing ribs connected to the surface of the outer surface 21Ac are provided on the back side of the upper surface 21Ab.

  On the other hand, the fusion part 21 </ b> B of the handle 2 </ b> B includes a planar fusion surface 21 </ b> Ba corresponding to the surface of the top surface 11 and a planar upper surface 21 </ b> Bb facing the grip part 23.

  The handle 2 as described above is formed of a soft resin and exhibits a cushioning property that allows the fingers to feel elasticity when grasped. The soft resin is not particularly limited as long as it exhibits such cushioning properties, and examples thereof include low density polyethylene resin, EVA (Ethylene Vinyl Acetate Copolymer) resin, and olefinic thermoplastic elastomer resin. In addition, these are examples, and other soft resins may be used as long as they can secure a cushioning property suitable as a handle, but those having excellent fusion property with the resin of the container body 10 are adopted. Is done.

-Effect of the synthetic resin container according to this embodiment-
With the configuration described above, when the synthetic resin container 1 is transported, when the container 1 is lifted by grasping the handle 2, the contents are full and heavy and the weight is concentrated on the fingers through the handle 2. Even if it is applied, the handle 2 itself has a cushioning property. Therefore, the handle 2 is difficult to bite into fingers, and unlike the conventional container, it does not hurt and cannot keep the container. Therefore, it is easy to carry even when it is heavy.

  Further, since the three handles 2 are juxtaposed along the longitudinal direction of the top surface 11, when the two synthetic resin containers 1 are adjacent to each other so that the handles 2 are parallel to each other, each synthetic resin container 1 Since the handles 2A located on the outermost side of each other are close to each other, both of these handles 2A can be gripped simultaneously. That is, two synthetic resin containers 1 can be carried simultaneously with one hand by placing fingers on both handles 2A, and a maximum of four synthetic resin containers 1 can be carried with both hands. Further, when the contents are stored in the synthetic resin container 1 and become heavier, the two grips 2A arranged on both side edges of the top surface 11 of the synthetic resin container 1 are held by both persons from both sides of the synthetic resin container 1 respectively. In addition, two synthetic people can carry one synthetic resin container 1 together.

  The number of handles 2 of the synthetic resin container 1 is not limited to three, but may be one, two, or four or more. Further, a plurality of handles 2 may be provided in a row along the longitudinal direction of the top surface 11, and in that case, one row or a plurality of rows may be provided. Furthermore, the handle 2 may be provided along the width direction of the top surface 11.

[Description of Method for Manufacturing Synthetic Resin Container According to this Embodiment]
Next, a method for manufacturing the synthetic resin container 1 according to this embodiment will be described with reference to FIGS. FIG. 2 is an exploded perspective view showing an insert part (handle), a nest, a pressure-resistant member, and a nest-holding support material used in the method for producing a synthetic resin container according to the present invention. FIG. 3 is a perspective view showing an insert part (handle) and a halfway of assembling the insert. FIG. 4 is a perspective view showing a state where an insert part (handle), a nest, a pressure-resistant member, and a nest-holding support member are assembled together without a mold. FIG. 5 is a cross-sectional view showing a state in which the insert part (handle), the insert, the pressure-resistant member, and the insert presser support member are set in the mold. In FIG. 2, the nest presser support member is shown by partially cutting one of the two due to space limitations.

  The synthetic resin container manufacturing method according to the present embodiment is a synthetic resin container manufacturing method for manufacturing a synthetic resin container by blow molding, and includes an insert component placement step and a container molding step, and before the insert component placement step, The insert part is provided with a pressure-resistant member that supports the fusion part of the insert part from behind and resists blow pressure received through the parison.

-Nested-
First, the insert used in the insert component placement step will be described.

  The nesting 3 is used to arrange the handle 2 as an insert part in the mold 6. As shown in FIG. 2, the nesting 3 is a set of two, and the inner surface of each nesting 3 is a synthetic resin container 1. The top surface 11 to the top surface of the side surface 13 are covered with the top surface. A handle insertion hole 31 through which the column portion 22 and the grip portion 23 of the handle 2 are inserted is provided near the outer edge of the insert 3. In addition, a notch 32 is provided on the inner end surface of the insert 3. When the notches 32 are opposed to each other and the two inserts 3 are brought into contact with each other, the support 22B of the handle 2B is supported from both sides. A hole 33 (see FIG. 4) is formed. The insert 3 thus formed is made of aluminum in terms of ease of cutting, ease of mounting on the mold 6 and ease of removal after forming the container. When the nesting 3 is made of aluminum as described above, either the handle 2B can be attached to the notch 32 of the nesting 3 via the magnet 51 provided on the pressure-reducing member 5A for the handle 2 described later. A metal sheet-like member 34 having magnetic adhesion such as iron is attached to the surface of the notch 32 of the insert 3. In addition, when the nest 3 itself is formed of a magnetized metal such as iron, it is not necessary to add such a metal sheet-like member 34.

−Nesting presser support material−
Next, the insert presser support material used in the insert component arranging step will be described.

  As shown in FIG. 5, the insert presser support member 4 is mounted in the gap S between the insert 3 and the inner surface of the mold 6, and resists the blow pressure that the insert 3 receives through the parison P during blowing. The nesting 3 is supported. The insert presser support material 4 is a rectangular parallelepiped in the present embodiment, but the shape is not limited to this, and the shape is not limited as long as it can be mounted in the gap S between the insert 3 and the inner surface of the mold 6. Is optional. The insert presser support material 4 thus formed is made of aluminum, like the insert 3. It may be formed of other metals such as iron. Further, when the insert 3 is made of a highly rigid metal and is not likely to be deformed when blown, the insert presser support member 4 can be omitted.

-Pressure member-
Next, the pressure member used in the preliminary work of the insert component placement process will be described.

  The pressure member 5 resists the pressure of the blow received by the fusion part 21 of the handle 2 via the parison P when the parison P of the container body 10 is blown, from behind (the upper surface 21b). It is for supporting. In the present embodiment, there are three types of the pressure member 5. In the following, alphabets are added to the reference numerals for distinction.

  First, the first pressure member 5 </ b> A supports the fused portion 21 in the grip opening 24 of the handle 2. The pressure member 5 </ b> A has an outer peripheral shape that matches the inner surface shape of the holding opening 24. A magnet 51 corresponding to the metal sheet-like member 34 having magnetic adhesion provided in the notch 32 of the insert 3 is provided on the pressure member 5A used in the handle 2B provided in the center of the top surface 11. It is inserted. The magnet 51 may be exposed to both surfaces of the pressure member 5A by penetrating the pressure member 5A, or a recess is provided on both surfaces or one surface of the pressure member 5A. May be fitted.

  The second anti-pressure member 5 </ b> B supports the fused portion 21 on the outside of each column portion 22 of the handle 2, that is, on both ends in the longitudinal direction of the handle 2. The pressure member 5 </ b> B has an outer peripheral shape that matches a space 21 h surrounded by the outer surface of the support column 22, the lower surface of the overhang portion 26, and the upper surface 21 b of the fused portion 21.

  The third pressure member 5C supports the fused portion 21A in the recess 21Ae of the handle 2A. The pressure member 5C has a concave surface in which the shape of the inner surface matches the convex shape of the outer surface 21Ac of the handle 2A, while the upper end surface is the back side of the upper surface 21Ab of the fused portion 21A and the outer surface is nested. 3 and the inner shape of each of the three shapes. Further, a pair of notches 52 and 52 that match a pair of reinforcing ribs (not shown) provided on the back side of the upper surface 21Ab of the fusion part 21A are provided on the upper end surface, and the outer side surface 21Ac of the fusion part 21A is provided on the inner surface. A protrusion 53 (see FIG. 5) that matches the recessed portion 21Af is provided.

  The pressure member 5 described above is made of aluminum like the insert 3. It may be formed of other metals such as iron. In this embodiment, since the three handles 2 are provided, the pressure member 5 corresponding to each handle 2 is used. For example, when the handle 2 is provided only at the center of the top surface 11. The third pressure member 5C is not necessary. Furthermore, when the handle 2 does not have the overhang part 26 and the fusion part 21 does not extend outside the support part 22, the second pressure member 5B is not necessary. In short, the pressure member 5 may be prepared according to the number and shape of the handles 2.

-Insert component placement process-
First, the pressure member 5 is attached to the handle 2 which is an insert part as a preliminary operation of the insert part arranging step. Specifically, as shown by a dashed line arrow in FIG. 2, the anti-pressure member 5 </ b> A is inserted into the grip opening 24 of each handle 2, and the outer surface and the overhang portion of the support column 22 of each handle 2. The pressure member 5B is inserted into a space 21h surrounded by the lower surface of 26 and the upper surface 21b of the fused portion 21. Moreover, about the handle 2A, 5 C of pressure-resistant members are inserted in the recessed part 21Ae.

  When the above preliminary work is completed, the handle 2A provided on both side edges of the top surface 11 is inserted into the handle insertion hole 31 of the corresponding insert 3 and the inner surface of the insert 3 with the grip portion 23 of the handle 2A as a head. Insert from the side. When this is completed, the one insert 3 with the handle 2 </ b> A inserted is placed in the insert receiving portion 62 in one split mold 61 of the mold 6.

  Next, as shown in FIG. 3, the handle 2 </ b> B disposed at the center of the top surface 11 of the container 1 is attached to the notch 32 of the insert 3 already placed in the mold 6, and the magnet 51 of the pressure member 5 is It attaches by making it magnetically adhere to the metal sheet-like member 34 of the notch 32.

  Subsequently, when the remaining insert 3 is placed in the insert receiving portion 62 in the other split mold 61 of the mold 6, the insert presser support material 4 is finally attached to the gap between the insert 3 and the inner surface of the mold 6, This process is complete.

  If the insert 3 is of high strength and there is no risk of deformation even when subjected to blow pressure, the attachment of the insert presser support material 4 may be omitted.

-Container molding process-
The container forming process is performed after the above-described insert part arranging process. After the parison P is supplied to the cavity 63 in the mold 6 and the mold 6 is clamped, the parison P is blown through the extraction port 12. This is a process of fusing the parison P and the insert part (handle 2).

  Here, the parison supply device (not shown) for supplying the parison P is disposed above the mold 6, and the parison P is suspended from the parison supply device in a vertical direction (a direction perpendicular to the paper surface in FIG. 5). The

  As shown in FIG. 5, the mold 6 is composed of a pair of opposed split molds 61, 61. A cavity 63 that matches the shape of the synthetic resin container 1 is provided inside the mold 6. And in such a metal mold | die 6, the nesting accommodating part 62 which accommodates the nesting 3 mentioned above in the one side (side facing an operator) of the split dies 61 and 61 is parallel to the supply direction of the parison P, respectively. Is provided.

  First, the parison P is suspended from the upper side of the mold 6 in the mold open state where the insert part arranging step is completed by the parison supply device, and the parison P is introduced into the mold 6.

Next, the parison P is sandwiched between the molds 6 and clamped. At this time, the insert part (handle) 2, the insert 3, the pressure member 5 and the insert retainer support 4 are assembled as shown in FIG. 4, and the center handle 2 </ b> B has a through hole 33 between the two inserts 3. Supported within. after that,
An air supply pipe (not shown) arranged corresponding to the forming part of the extraction port 12 is inserted so as to pierce into the parison P from the extraction port 12, and compressed air is supplied into the parison P from the air supply pipe. As a result, the parison P expands in the cavity 63 and eventually comes into pressure contact with the inner surface of the cavity 63. Since the fusion part 21 of the handle 2 supported by the insert 3 is exposed in the cavity 63, the parison P and the fusion part 21 are fused by this pressure contact. Here, the temperature of the parison P is about 160 to 180 ° C. in normal blow molding, but in the present invention, the temperature of the parison P is slightly higher than 180 to 200 ° C. so that the parison P and the fused portion 21 are fused well. Is preferred.

  When the blow is completed, the parison P is solidified and the mold 6 is opened. First, the nest presser support material 4 is taken out from the mold 6, and then the molded product is taken out from the mold 6. At this time, since the insert 3 and the pressure member 5 are attached to the molded product, the insert 3 and the pressure member 5 are sequentially removed from the molded product, whereby a plurality of handles 3 are attached to the top surface. The provided synthetic resin container 1 is completed.

-Effects of the method for producing a synthetic resin container according to this embodiment-
As explained above, in this embodiment, the synthetic resin container 1 in which the plurality of handles 2 having cushioning properties are provided on the outer surface of the container body 10 made of hard resin can be efficiently manufactured by integral molding.

  Further, since the pressure-resistant member 5 is attached to the insert part (handle) 2 and the fusion part 21 of the handle 2 is supported from behind, the fusion pressure is received by the blow of the parison P. The portion 21 is prevented from being deformed. Therefore, there is no risk of a decrease in strength at the fused portion between the container body 10 and the handle 2, and no deformation occurs on the handle 2 attachment side of the container body 10, so that the aesthetic appearance of the entire container is not impaired.

  Further, in the insert component arranging step, the insert presser support material 4 that resists the pressure of the blow received through the parison P is mounted in the gap between the insert 3 and the inner surface of the mold 6. It is no longer necessary to have Accordingly, since a light metal such as aluminum can be employed as the insert retainer support member 4, it is easy to perform operations such as attaching the insert 3 to the mold 6 and removing it from the molded product.

  The embodiments of the present invention described above are all examples embodying the present invention, and are not of a nature that limits the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Synthetic resin container 10 Container main body 11 Top surface 12 Extraction port 2 Handle 21 Fusing part 24 Gripping opening 3 Nesting 4 Nesting support material 5 Pressure member 6 Mold P Parison

Claims (3)

Synthetic resin container comprising: a hard resin container body having at least one extraction port; and a soft resin cushion handle having a grip opening and provided on the outer surface of the container body. Is a synthetic resin container manufacturing method for manufacturing by blow molding,
Insert part placement step of placing the pre-molded handle as an insert part in the mold in parallel with the supply direction of the parison molded in the container body using the insert with the fusion part facing the mold. When,
After the insert part placement step, the parison is supplied into the mold and the mold is clamped, and then the parison is blown through the extraction port to fuse the parison and the insert part. A container forming step,
Before the insert component placement step, a pressure-pressure member that supports the fusion part of the insert component from behind and resists the pressure of the blow received through the parison is attached to the insert component. ,
A method for producing a synthetic resin container. It is a synthetic resin container manufacturing method according to claim 1,
In the insert component arranging step, mounting a nest presser support material that resists the pressure of the blow received through the parison in the gap between the nest and the inner surface of the mold,
A method for producing a synthetic resin container.   A synthetic resin container in which a handle having a cushioning property and made of at least one soft resin having a grip opening is integrally formed on an outer surface of a hard resin container body having at least one extraction port.

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