JP7286249B2 - Synthetic resin container and method for manufacturing synthetic resin container - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a synthetic resin container and a method for manufacturing a synthetic resin container.

As a synthetic resin container capable of accommodating contents such as cosmetics and food, there is a synthetic resin container having a tubular mouth and a body forming a space for accommodating the contents, as shown in Patent Document 1, for example. Containers are known. In this type of synthetic resin container, efforts are being made to reduce the amount of resin by thinning the body and bottom for the purpose of considering environmental issues and reducing costs.

JP 2007-204104 A

By the way, when the thickness of the body and bottom of the synthetic resin container is reduced, the strength of the container is lowered, so it has been difficult to excessively reduce the amount of resin.

The present disclosure has been made in view of such problems, and its purpose is to provide a new synthetic resin container and a method for manufacturing a synthetic resin container that can reduce the amount of resin required for manufacturing. to provide.

The synthetic resin container of the present disclosure is
a cylindrical mouth;
a body that extends below the mouth;
A synthetic resin container comprising a lid that is integrally formed with at least one of the mouth and the body via a hinge and closes the mouth,
The torso is
a detachable portion having an outer layer body and an inner layer body provided inside the outer layer body and provided so as to be continuous with the mouth portion, the inner layer body being detachable from the outer layer body;
a non-detachment portion provided at a position connected to the detachment portion, not detached in the thickness direction and having an opening at a position spaced apart from the detachment portion;
The inner layer body extends radially inward beyond the outer layer body at a position where the mouth portion and the body portion are connected to close a communication port that communicates the mouth portion and the body portion,
By separating the inner layer body from the outer layer body and pushing it out to the opening side, the outer layer body and the inner layer body can form a space for containing contents ,
The detachable part is composed of three resin layers, and the inner two layers constitute the inner layer body .

Further, in the synthetic resin container of the present disclosure, in the above configuration, the trunk portion has a capped tubular shape with the opening at the lower end, and the non-separable portion is continuous below the detachable portion. is preferred.

Further, in the synthetic resin container of the present disclosure, it is preferable that the inner layer body is formed to be thinner than the outer layer body in the above configuration.

Further, the method for manufacturing the synthetic resin container of the present disclosure includes:
a cylindrical mouth;
and a body that continues below the mouth,
In the trunk,
a detachable portion having an outer layer body and an inner layer body provided inside the outer layer body and provided so as to be continuous with the mouth portion, the inner layer body being detachable from the outer layer body;
a non-detachment portion provided at a position connected to the detachment portion and not detached in the thickness direction and having an opening at a position spaced apart from the detachment portion;
The detachable portion extends radially inward beyond a position where the mouth portion and the body portion are connected to form a primary molded body that closes a communication port that communicates the mouth portion and the body portion. a step;
a step of forming a secondary molded body in which a cover for closing the opening is integrally formed with the primary molded body;
and cutting off the outer layer body from a portion of the detached portion of the secondary molded body that closes the communication port.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a new synthetic resin container and a method for manufacturing a synthetic resin container that can reduce the amount of resin required for manufacturing.

1 is a front cross-sectional view of a synthetic resin container that is an embodiment of the present disclosure; FIG. FIG. 2 is a detailed view of part A in FIG. 1; FIG. 4 is a diagram showing a state in which a peeling rod is inserted from the mouth to peel the inner layer body from the outer layer body in the synthetic resin container that is an embodiment of the present disclosure. It is a figure which shows the state which peeling of the inner-layer body was completed in FIG. 3A. FIG. 4 is a diagram showing a state in which the storage space of the synthetic resin container, which is an embodiment of the present disclosure, is filled with contents and the lid is attached. 1 is a flow chart showing procedures for carrying out a method for manufacturing a synthetic resin container according to an embodiment of the present disclosure. 1 is a front cross-sectional view of a primary molded body of a synthetic resin container that is an embodiment of the present disclosure; FIG. FIG. 6B is a detailed view of part B in FIG. 6A. FIG. 2 is a diagram showing the state of resin in a cavity in the first step (injection of main resin) of laminate injection molding of a primary molded body of a synthetic resin container according to an embodiment of the present disclosure; At the end of the second step (injection of the main material resin and EVOH resin) and the third step (reinjection of only the main material resin) of lamination injection molding of a primary molded body of a synthetic resin container that is an embodiment of the present disclosure. is a diagram showing the state of the resin in the cavity of. 1 is a front cross-sectional view of a secondary molded body obtained by further molding a lid on the primary molded body of a synthetic resin container according to an embodiment of the present disclosure; FIG. FIG. 4 is a diagram showing a step of cutting off a portion of the outer layer that closes the communication port in the method of manufacturing a synthetic resin container according to an embodiment of the present disclosure;

Hereinafter, the present disclosure will be described more specifically by way of example with reference to the drawings.

A synthetic resin container 100, which is an embodiment of the present disclosure shown in FIG. , and a lid 60 for closing the mouth portion 10 .

In the present specification, claims, and drawings, the vertical direction means upward and downward directions when the synthetic resin container 100 is in an upright position as shown in FIG. In addition, the radially outer side is the direction toward the outer side along a straight line that passes through the central axis O1 of the synthetic resin container 100 in FIG. It shall mean the direction toward the center axis O1. Also, "detachment" means that the inner layer body separates from the outer layer body in the thickness direction. Therefore, "detachment" refers to the separation of the inner layer body from the state in which it is adjacent to and in contact with the outer layer body, and the separation of the inner layer body when a gas-filled layer is formed between the outer layer body and the inner layer body. It also includes the case where it is farther than the thickness of the gas-filled layer from the outer layer body. "Separated part" and "non-separated part" are concepts including "separated part" and "non-separated part", respectively.

As shown in FIG. 1, the opening 10 has a substantially cylindrical outer peripheral wall 11, and the outer surface of the outer peripheral wall 11 is formed with a protrusion 68b for undercut engagement with the lid 60 by plugging. It is

Below the mouth portion 10, a capped cylindrical body portion 20 is provided. The body portion 20 is integrally formed with the mouth portion 10, and has a substantially cylindrical side portion whose outer diameter is substantially unchanged from the upper end portion to the lower end portion. there is The trunk portion 20 has an outer layer body 22a and an inner layer body 22b provided inside the outer layer body 22a in an upper region connected to the mouth portion 10, and the inner layer body 22b has a peeling portion 22 that can be peeled off from the outer layer body 22a. I have. Moreover, the trunk|drum 20 continues below the peeling part 22, and is provided with the non-peeling part 24 which does not peel in a thickness direction. The opening 28 is formed at the lower end of the non-peeling portion 24 and is provided at a position separated from the peeling portion 22 . FIG. 2 shows an enlarged view of a boundary portion between the stripped portion 22 and the non-stripped portion 24 in the trunk portion 20. As shown in FIG.

In this embodiment, synthetic resin materials such as polyethylene (PE) and polypropylene (PP) can be used for the outer layer body 22a. When polyethylene is used for the outer layer body 22a, high-density polyethylene (HDPE) or low-density polyethylene (LDPE) can be used. A synthetic resin container 100 having excellent impact resistance can be manufactured. Moreover, when low-density polyethylene (LDPE) is used, the trunk portion 20 can be made flexible. However, it is not limited to this aspect, and other synthetic resin materials such as polyethylene terephthalate (PET) may be used.

As shown in FIG. 2, the inner layer body 22b is composed of an innermost layer 22b2 on the innermost side of the body 20 and an intermediate layer 22b1 arranged between the outer layer body 22a and the innermost layer 22b2. The intermediate layer 22b1 and the innermost layer 22b2 constitute a second layer and a third layer when counted from the outside including the outer layer body 22a (when the outer layer body 22a is counted as the first layer).

In this embodiment, the material of the intermediate layer 22b1 is preferably ethylene-vinyl alcohol copolymer resin (EVOH), polyvinyl alcohol resin, or other synthetic resin material different from the outer layer body 22a, such as nylon. By forming the outer layer body 22a and the intermediate layer 22b1 from different materials with low compatibility, the outer layer body 22a and the inner layer body 22b can be easily separated at the separation portion 22. FIG. In addition, by including liquid paraffin or the like in the material of the intermediate layer 22b1, the intermediate layer 22b1 can be easily separated from the outer layer body 22a. However, it is not limited to this mode, and the same synthetic resin material as that of the outer layer body 22a may be used as the material of the intermediate layer 22b1.

Further, instead of providing the synthetic resin intermediate layer 22b1, a gas-filled layer filled with, for example, nitrogen gas may be provided between the outer layer body 22a and the innermost layer 22b2. In this case, the innermost layer 22b2 becomes the inner layer body 22b. With such a configuration, the inner layer body 22b can be easily reversed and detached from the outer layer body 22a to form the content storage space S, compared to the case where the outer layer body 22a and the inner layer body 22b are in direct contact with each other. be able to. In addition, since the opposing surface is not roughened when the inner layer body 22b is separated from the outer layer body 22a, the appearance of the opposing surface can be kept good. In addition to the nitrogen gas described above, air, oxygen, carbon dioxide, other inert gases, or the like can also be used as the gas to be filled in the gas-filled layer.

In this embodiment, the inner layer body 22b has two resin layers 22b1 and 22b2 as shown in FIG. However, from the viewpoint of visibility of the drawings, the inner layer body 22b is drawn as a single resin layer in drawings other than FIG. Note that

In the present embodiment, the non-peeling portion 24 is integrally formed of the same material so that it cannot be peeled off in the thickness direction, but it is not limited to this aspect. The non-peeling portion 24 may have a configuration in which the outer member and the inner member do not separate due to physical bonding based on the shape. In addition, the non-peeling portion 24 may have a configuration that does not separate by physical bonding or chemical bonding other than the shape, such as an adhesive or heat.

The lid body 60 is integrally formed with the trunk portion 20 via a hinge portion 67 as shown in FIG. The lid 60 includes a lid peripheral wall 61 having an outer diameter substantially the same as that of the body 20 , and a top wall 62 closing the upper end of the lid peripheral wall 61 . The top wall 62 is provided with a fitting tubular wall 65 and a sealing wall 63 that hang down toward the mouth portion 10 . An engaging projection 65a is formed at the lower end of the fitting cylinder wall 65, and when the lid body 60 is closed, it is undercut-engaged with a projection 68b provided on the mouth portion 10, thereby closing the lid. A body 60 can be secured to mouth 10 (see FIG. 4). A knob portion 61 a for pinching and opening the lid body 60 is provided at a circumferential position facing the hinge portion 67 on the lid body peripheral wall 61 .

When the lid body 60 is closed, the outer surface of the seal wall 63 fits into the inner surface of the outer peripheral wall 11 of the opening 10 (see FIG. 4). This allows the mouth portion 10 to be liquid-tightly sealed to the outside. Instead of the seal wall 63, a packing may be provided on the rear surface of the lid 60 to seal the opening 10 with the packing.

In order to store the content in the synthetic resin container 100, the inner layer body 22b is peeled off from the outer layer body 22a of the peeling portion 22 and pushed out toward the opening 28 side. In the step of peeling off the inner layer 22b, for example, as shown in FIG. downwards. By pressing the inner layer body 15b of the mouth portion 10, the inner layer body 22b of the stripped portion 22 of the trunk portion 20 connected thereto is stripped from the outer layer body 22a, and an opening 28 is formed with the boundary portion between the stripped portion 22 and the non-peeled portion 24 as a fulcrum. folded to the side (see FIG. 3B). As a result, a content storage space S defined by the outer layer 22a, the inner layer 15b, and the separated inner layer 22b is formed in the body 20 of the synthetic resin container 100. As shown in FIG.

In this embodiment, since the inner layer 22b is thinner than the outer layer 22a, the bending rigidity of the inner layer 22b is suppressed and the inner layer 22b can be easily removed from the outer layer 22a. It can be peeled off.

FIG. 4 shows a state in which an accommodation space S is formed and filled with contents. In this embodiment, the outer layer body 22a is configured to be thicker than the inner layer body 22b. Therefore, the user can hold the outer layer body 22a portion having higher rigidity than the inner layer body 22b or the non-peeling portion 24 having higher rigidity than the outer layer body 22a, so that the synthetic resin container 100 can be held more stably. can handle. In addition, since the inner layer body 22b portion forming the housing space S is covered from the radially outer side by the non-peeling portion 24, the inner layer body 22b having low rigidity can be protected by the non-peeling portion 24 having high rigidity.

Formation of the accommodation space S by peeling the outer layer body 22a and the inner layer body 22b is not limited to the method using the peeling rod 50 described above. For example, a filling nozzle for the contents is attached to the mouth portion 10, and the contents are filled while pressurizing the inside of the container to press the inner layer body 15b, and the inner layer body 22b of the body part 20 connected to the inner layer body 15b is replaced by the outer layer body. The contents may be filled while increasing the volume of the accommodation space S by peeling it off from 22a.

Next, a method for manufacturing the synthetic resin container 100 will be described in detail with reference to the flow chart of FIG. 5 and the like.

When manufacturing the synthetic resin container 100, first, a primary molded body 101 shown in FIGS. 6A and 6B is formed. When forming the primary molded body 101, it can be formed using a molding die 40 for lamination injection molding shown in FIGS. 7A and 7B.

That is, in the first step shown in FIG. 7A, from the gate 41a of the molding die 40 of the primary molded body 101, the main resin 31 (polyethylene (PE) or polypropylene (PP)) is injected into the cavity C of the mold 40 (step S101). Of the supplied main resin 31, the portion that remains near the outer mold 41 that forms the outer shape of the primary molded body 101 and the inner mold 43 that forms the inside of the body 20 is Since the temperature is likely to drop due to heat dissipation via 41 and 43, it is easy to solidify in layers along both molds 41 and 43 (to become solidified portion 31a shown in FIG. 7A). Therefore, in the cavity C of the molding die 40, there are a solidified portion 31a starting to solidify on the inner surface side of the outer mold 41 and a solidified portion 31a starting to solidify on the outer surface side of the inner mold 43. The main material resin 31 can be filled with the main resin 31 including the unsolidified portion 31b which is the middle layer portion which is located between and which has not yet been solidified and has high fluidity.

Next, in the second step, the main resin 31c and EVOH 33 are injected from the gate 41a and flowed in the direction away from the gate 41a between the solidified portions 31a (step S103). This flow allows the unsolidified portion 31b of the main resin 31 to flow while being extruded toward the remaining space in the cavity C, so that it can be solidified in layers one after another while spreading over the EVOH 33. Therefore, a laminated structure in which the EVOH 33 is sandwiched between the solidified portions 31a of the main resin 31 can be obtained. The EVOH 33 becomes the intermediate layer 22b1 shown in FIG. If a gas-filled layer is provided instead of the intermediate layer 22b1, for example, nitrogen gas or the like may be supplied from the gate 41a in the second step.

Finally, in the third step, only the main resin 31d is again injected from the gate 41a (step S105). As a result, the radial central region in the gate 41a can be filled with the main resin 31d (see FIG. 7B). Further, the main resin 31c and the EVOH 33 injected from the gate 41a in the previous second step finally harden while extending to the intermediate height of the trunk portion 20 as shown in FIG. 7B. The EVOH 33 ejected from the gate 41 a in the second step becomes the intermediate layer 22 b 1 that forms the stripped portion 22 of the body portion 20 . In addition, the solidified portion 31a adjacent to the intermediate layer 22b1 and facing the inner mold 43 constitutes the innermost layer 22b2. The main resin 31c injected together with the EVOH 33 in the second step constitutes the outer layer body 22a together with the solidified portion 31a facing the mold 41 on the outside. That is, the peeled portion 22 is from the upper end of the body portion 20 to the height position where the EVOH 33 finally extends in the third step, and the non-peeled portion 24 is the lower region where the EVOH 33 does not enter. The height of the body 20 that the peeled portion 22 occupies is determined depending on the volume of the main resin 31 injected into the cavity C in the first step. The outer surface of the body portion 20 can be decorated with an in-mold label or the like formed by inserting a label created by offset printing or the like into a mold, for example.

In the present embodiment, lamination injection molding is used to form the primary molded body 101, but the present invention is not limited to this mode, and other molding methods such as extrusion molding and sheet molding may be used. In particular, when the innermost layer 22b2 is made of a synthetic resin material different from that of the outer layer body 22a, it is preferable to use a molding method such as extrusion molding or sheet molding for molding the primary molded body 101. FIG.

FIG. 6A shows the primary molded body 101 of the synthetic resin container 100 formed by executing steps S101 to S105. Similar to the synthetic resin container 100 shown in FIG. 1, the primary molded body 101 includes a mouth portion 10 and a body portion 20, and the primary molded body 101 is molded radially inside the mouth portion 10 by injection molding. A gate portion 13 formed in a gate 41a (see FIGS. 7A and 7B) for supplying resin to the molding die 40 at the time is arranged. A peeling portion 22 of the trunk portion 20 extends radially inward beyond a position (connecting position) where the mouth portion 10 and the trunk portion 20 are connected (a portion radially inside the connecting position is a peeling portion 15). , the gate portion 13 extends upward from the center axis O1 of the peeled portion 15 . A notch portion 21 is formed in the upper end portion of the body portion 20 of the primary molded body 101, to which the mounting portion 68 is fixed when the lid body 60 is integrally molded in a step described later.

The gate portion 13 has a substantially truncated cone shape as shown in FIG. 6B. The gate portion 13 is connected to the outer layer body 22a of the trunk portion 20 via the outer layer body 15a of the peeling portion 15, and is made of the same material as the outer layer body 22a.

After the primary molded body 101 is formed, as shown in FIG. 8, the lid body 60 is integrally formed with the primary molded body 101 to form the secondary molded body 102 (step S107). In FIG. 8, the portion indicated by the two-dot chain line is the portion formed by secondary molding. The portion formed by secondary molding includes a lid 60, a hinge portion 67 that connects the lid 60 and the primary molded body 101, and an attachment portion 68 that fixes the hinge portion 67 to the primary molded body 101 side. ing.

The mounting portion 68 includes a peripheral wall portion 68d filled in the notch portion 21 of the primary molded body 101, an upper wall portion 68c extending radially inward from the upper end portion of the peripheral wall portion 68d, and a radially inner portion of the upper wall portion 68c. An upright portion 68a is provided upright from the end along the outer peripheral wall 11 and provided with a projection portion 68b.

In the present embodiment, the lid 60 is configured to be fixed to the mouth portion 10 and the body portion 20 via the hinge portion 67 and the mounting portion 68, but is not limited to this aspect, and the lid 60 is hinged. It may be fixed to at least one of the mouth portion 10 and the body portion 20 via the portion 67 .

The material of the lid body 60 formed by secondary molding may be the same kind of material as the outer layer body 22a of the body 20, or may be a different material from the outer layer body 22a. When the material of the lid 60 is different from that of the outer layer 22a of the body 20, the lid 60 and the mounting portion 68 are made of a material that is highly compatible with the material of the outer layer 22a so as to facilitate fixing. It is preferable to make the shape of 68 into a shape that is difficult to come off from the trunk portion 20 .

The lid body 60 may be formed by insert molding the lid body 60 using the primary molded body 101 as an insert material, or by forming the lid body 60 by two-color molding in the same mold as the primary molded body 101. may

After the secondary molded body 102 is formed, as shown in FIG. 9, the outer layer body 15a is removed from the peeled portion 15 in the region that closes the communication port 18 (step S109). As a result, the gate portion 13 above the outer layer body 15a is also removed. This step can be performed, for example, by using cutting means such as an ultrasonic cutter capable of applying ultrasonic vibrations in the vertical direction to a blade provided at the lower end. By cutting off the outer layer body 15a, the communication port 18 between the mouth portion 10 and the trunk portion 20 is closed only by the inner layer body 15b as shown in FIG. In this embodiment, only the outer layer body 15a is excised and removed from the secondary molded body 102, but the configuration is not limited to this. The intermediate layer 15b1 (see FIG. 2) may be cut out in addition to the outer layer body 15a by cutting means, leaving only the innermost layer 15b2. The layer to be excised can be selected, for example, by precisely moving the tip of the blade of the excision means to the lower end of the layer to be excised.

The synthetic resin container 100 formed by cutting the outer layer 15a in step S109 can be stacked vertically so that the mouth portion 10 enters the body portion 20 through the opening 28 of the body portion 20 . This makes it possible to reduce the vertical dimension of the container during transportation.

After executing step S109, the inner layer body 22b is peeled from the outer layer body 22a of the peeling portion 22 and pushed out toward the opening 28 (step S111). In the step of peeling off the inner layer body 22b, as described above, the peeling rod 50 is inserted into the synthetic resin container 100 through the mouth portion 10, and the inner layer body 15b blocking the communication port 18 is pushed downward. Press towards (see FIG. 3A). As a result, a content storage space S defined by the outer layer 22a, the inner layer 15b, and the peeled inner layer 22b is formed in the body 20 of the synthetic resin container 100 (see FIG. 3B).

Note that step S111 may or may not be added to one step constituting the method for manufacturing the synthetic resin container 100 according to the present embodiment. That is, when the state in which the inner layer body 22b is turned over to form the accommodation space S in step S111 is considered to be the state in which the synthetic resin container 100 is completed, the manufacturing method of the synthetic resin container 100 includes steps from step S101. Including up to S111. On the other hand, in step S109, the portion of the outer layer body 15a that closes the communication port 18 is cut away, and the peeling portion 22 is not peeled off, and the housing space S is not yet formed. If so, the method for manufacturing the synthetic resin container 100 includes steps S101 to S109.

As described above, in this embodiment, the tubular mouth portion 10, the trunk portion 20 continuing below the mouth portion 10, and the mouth portion 10 and the trunk portion 20 are integrally formed via the hinge portion 67, thereby A synthetic resin container 100 comprising a lid body 60 for closing a part 10. The body part 20 has an outer layer body 22a and an inner layer body 22b provided inside the outer layer body 22a, and is connected to the mouth part 10. and an opening 28 is provided at a position connected to the peeling portion 22 so that the inner layer body 22b can be peeled from the outer layer body 22a and is not peeled in the thickness direction and is spaced apart from the peeling portion 22. The inner layer body 22b extends radially inward beyond the outer layer body 22a at a position where the mouth portion 10 and the body portion 20 are connected to communicate the mouth portion 10 and the body portion 20. The communication port 18 is closed, and the inner layer body 22b is peeled off from the outer layer body 22a and pushed out to the opening 28 side, so that the outer layer body 22a and the inner layer body 22b can form the storage space S for the contents. Configured. By adopting such a configuration, it is not necessary to use a thick resin for the bottom part that closes the lower end of the body part 20. Therefore, the amount of resin used in the synthetic resin container 100 for the purpose of considering environmental issues and reducing costs can be reduced. In addition, since the inner layers 15b and 22b, which are peeled and turned over from the peeling portions 15 and 22 and used as the bottom portion of the synthetic resin container 100, are thin and relatively soft, the amount of contents remaining in the storage space S is reduced. Even in this case, the bottom can be lifted to facilitate discharge of the small contents.

Moreover, in this embodiment, the trunk portion 20 has a truncated tubular shape with an opening 28 at the lower end portion, and the non-peeling portion 24 is configured to continue below the peeling portion 22 . By adopting such a configuration, inserting the stripping rod 50 from the opening 10 presses the inner layer body 15b, peels the inner layer body 22b connected thereto from the outer layer body 22a, and easily pushes it toward the opening 28 side. can be done. Further, the inner layer body 22b separated from the outer layer body 22a at the peeling portion 22 is arranged inside the non-peeling portion 24, so that the inner layer body 22b can be protected by the non-peeling portion 24. FIG.

In the present embodiment, the peeling portion 22 is composed of three resin layers, and the inner two layers (the intermediate layer 22b1 and the innermost layer 22b2) constitute the inner layer body 22b. The intermediate layer 22b1 and the innermost layer 22b2 of the synthetic resin container 100 formed in steps S101 and S103 by lamination injection molding are thinner than the outer layer body 22a. The difference in thickness between the outer layer body 22a and the inner layer body 22b forming the accommodation space S can be prevented from becoming significant.

In this embodiment, the peeling portion 22 is composed of three resin layers, the first layer and the third layer from the outside are a polyethylene resin layer or a polypropylene resin layer, and the second layer is an EVOH resin layer. Alternatively, it is configured to be a polyvinyl alcohol-based resin layer. By adopting such a configuration, the first layer and the second layer, and the second layer and the third layer are formed of different types of synthetic resins with low compatibility, respectively. It can be easily peeled between the layers or between the second and third layers.

Further, in this embodiment, the inner layer body 22b is configured to be thinner than the outer layer body 22a. By adopting such a configuration, the user can grip the outer layer body 22a portion having higher rigidity than the inner layer body 22b or the non-peeling portion 24 having even higher rigidity than the outer layer body 22a. The synthetic resin container 100 can be handled. In addition, since the inner layer body 22b portion forming the accommodation space S is covered from the radially outer side by the non-peeling portion 24, the inner layer body 22b portion having low rigidity can be protected by the non-peeling portion 24 having high rigidity.

In addition, the present embodiment is a method for manufacturing the synthetic resin container 100, which includes a cylindrical mouth portion 10 and a trunk portion 20 that continues below the mouth portion 10. The trunk portion 20 includes an outer layer body 22a. and an inner layer body 22b provided inside the outer layer body 22a and provided so as to be continuous with the mouth portion 10, the inner layer body 22b being able to be peeled off from the outer layer body 22a; A non-peeling portion 24 is provided that does not peel in the thickness direction and has an opening 28 at a position separated from the peeling portion 22, and the peeling portion 22 extends beyond the position where the mouth portion 10 and the body portion 20 are connected. A step of forming a primary molded body 101 that extends radially inward to close the communication port 18 communicating between the mouth portion 10 and the body portion 20; and a step of cutting off the outer layer body 15a from the part of the peeled parts 15 and 22 of the secondary molded body 102 that closes the communication port 18. . By adopting such a configuration, it is not necessary to use a thick resin for the bottom part that closes the lower end of the body part 20. Therefore, the amount of resin used in the synthetic resin container 100 for the purpose of considering environmental issues and reducing costs can be reduced. In addition, since the inner layers 15b and 22b, which are peeled and turned over from the peeling portions 15 and 22 and used as the bottom portion of the synthetic resin container 100, are thin and relatively soft, the amount of contents remaining in the storage space S is reduced. Even in this case, the bottom can be lifted to facilitate discharge of the small contents.

In particular, in the present embodiment, the lid body 60 is formed by secondary molding with respect to the primary molded body 101 having the mouth portion 10 and the body portion 20. Therefore, the resin used for the intermediate layer 22b1 is Quality can be stabilized because problems such as flowing into the side do not occur.

Although the present disclosure has been described with reference to figures and examples, it should be noted that various variations and modifications will be readily apparent to those skilled in the art based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and multiple components can be combined into one or divided. It should be understood that the scope of the present invention includes these.

For example, in the present embodiment, the peeling portion 22 of the body portion 20 is configured to have a three-layer laminated structure, but it is not limited to this aspect. The peeling portion 22 may have a two-layer structure including one outer layer and one inner layer, or may have a laminated structure of four or more layers.

In the present embodiment, of the three-layer laminated structure of the peeling portion 22, one outer layer constitutes the outer layer body 22a, and two inner layers constitute the inner layer body 22b. is not limited. For example, the reference numerals 22a and 22b1 in FIG. 2 may constitute the outer layer body, and only the reference numeral 22b2 may constitute the inner layer body. In that case, in step S109 of FIG. 5, in addition to the reference numeral 15a connected to the reference numeral 22a, the reference numeral 15b1 connected to the reference numeral 22b1 may also be removed by the cutting means (see FIGS. 2 and 6B).

REFERENCE SIGNS LIST 10 Mouth 11 Peripheral wall 13 Gate 15 Separation part (detachment part)
15a Outer layer body 15b Inner layer body 15b1 Intermediate layer 15b2 Innermost layer 18 Communication port 20 Body portion 21 Notch portion 22 Peeling portion (detachment portion)
22a outer layer body 22b inner layer body 22b1 intermediate layer 22b2 innermost layer 24 non-peeling portion (non-separating portion)
28 opening 31 main resin 31a solidified portion 31b unsolidified portion 31c main resin 31d main resin 33 EVOH
40 molding die 41 outer die 41a gate 43 inner die 50 peeling rod 60 lid 61 lid peripheral wall 61a knob 62 top wall 63 sealing wall 65 fitting cylindrical wall 65a engaging projection 67 hinge 68 Mounting portion 68a Standing portion 68b Protruding portion 68c Upper wall portion 68d Peripheral wall portion 100 Synthetic resin container 101 Primary molded body 102 Secondary molded body C Cavity O1 Center axis S Storage space

Claims (4)

a cylindrical mouth;
a body that extends below the mouth;
A synthetic resin container comprising a lid that is integrally formed with at least one of the mouth and the body via a hinge and closes the mouth,
The torso is
a detachable portion having an outer layer body and an inner layer body provided inside the outer layer body and provided so as to be continuous with the mouth portion, the inner layer body being detachable from the outer layer body;
a non-detachment portion provided at a position connected to the detachment portion, not detached in the thickness direction and having an opening at a position spaced apart from the detachment portion;
The inner layer body extends radially inward beyond the outer layer body at a position where the mouth portion and the body portion are connected to close a communication port that communicates the mouth portion and the body portion,
By separating the inner layer body from the outer layer body and pushing it out to the opening side, the outer layer body and the inner layer body can form a space for containing contents ,
A synthetic resin container , wherein the detachable portion is composed of three resin layers, and the inner two layers constitute the inner layer body . 2. The synthetic resin container according to claim 1, wherein said body has a truncated cylindrical shape with said opening at its lower end, and said non-detachable portion continues below said detachable portion. 3. The synthetic resin container according to claim 1 , wherein said inner layer is thinner than said outer layer. a cylindrical mouth;
and a body that continues below the mouth,
In the trunk,
a detachable portion having an outer layer body and an inner layer body provided inside the outer layer body and provided so as to be continuous with the mouth portion, the inner layer body being detachable from the outer layer body;
a non-detachment portion provided at a position connected to the detachment portion and not detached in the thickness direction and having an opening at a position spaced apart from the detachment portion;
The detachable portion extends radially inward beyond a position where the mouth portion and the body portion are connected to form a primary molded body that closes a communication port that communicates the mouth portion and the body portion. a step;
a step of forming a secondary molded body in which a cover for closing the opening is integrally formed with the primary molded body;
A method of manufacturing a synthetic resin container, comprising the step of cutting off the outer layer body from a portion of the detached portion of the secondary molded body that closes the communication port.

Images