JP5326059B1 - Container, container injection molding method, and container injection mold - Google Patents

Abstract

An object of the present invention is to mold a wide-mouthed container having an undercut inside the container body by injection molding to improve the hermeticity of the container and to manufacture it at low cost.
An injection mold 200 includes a neck inner mold 90 having a molding surface continuous in a circumferential direction for molding an end portion 118 of an opening 117 from an inner peripheral surface of a neck portion 112 of a container body 110. A first slide core 50 for forming an undercut 114 that penetrates the neck inner mold 90 and is continuous with the inner peripheral surface of the body 111 of the container body 110 and the inner peripheral surface of the neck 112, and The second slide core 60, the core inner mold 90, and the core block 70 disposed in a region surrounded by the pair of first slide cores 50 and the pair of second slide cores 60 are provided.
[Selection] Figure 3

Description

  The present invention relates to a container, a container injection molding method, and a container injection mold. More specifically, the container of the present invention has a wide mouth and has an undercut inside the container body. The injection molding method and injection mold of the present invention are used for manufacturing such a container.

  Conventionally, for example, a wide-mouth container is known as a cosmetic container for filling a creamy cosmetic. The wide-mouthed container is mainly composed of a container body, a packing, and a lid. The lid is attached to the neck of the container body. A container is also known in which the container body and the lid have substantially the same outer diameter. The container body of such a container is different in the outer diameters of the trunk and neck. When a difference is provided between the outer diameter of the body and the neck of the container body, a portion (shoulder) where the outer diameter changes from the neck to the body is formed on the outer peripheral surface of the container body.

  Containers in which the shoulder is formed include a type having an undercut on the inner peripheral surface of the shoulder and a type having no undercut. In the type in which the inner peripheral surface of the shoulder does not have an undercut, the outer diameter is larger in the trunk than in the neck, but the inner diameter is constant from the trunk to the neck. Since this type has no undercut, it is easy to remove the mold when molding by injection molding means. However, the thickness of the body of the container body is thicker than the thickness of the neck, and the amount of resin used is increased. Moreover, since it is thick, resin is hard to cool and solidify at the time of injection molding, and it takes time for injection molding. For this reason, there exists a problem that manufacturing cost increases and it is difficult to provide a container at low cost.

  On the other hand, the type having an undercut on the inner peripheral surface of the shoulder can reduce the wall thickness of the body of the container body and reduce the amount of resin used as the depth of the undercut increases. Also, if the wall thickness is thin, the resin is easy to cool and solidify during injection molding, and the injection molding time can be shortened. For this reason, it becomes possible to suppress the manufacturing cost and provide the container at a low cost. However, since it has an undercut, it is difficult to remove the mold when molding by injection molding. For example, Patent Documents 1 and 2 are known as techniques for manufacturing a wide-mouthed container having an undercut by injection molding means.

  In the injection molding techniques disclosed in Patent Documents 1 and 2, the molds are punched by so-called forced cutting. Specifically, after injecting the resin into the cavity of the injection mold, the mold is opened before the resin cools and solidifies, and from the opening of the neck of the container body that is a molded body, the inner diameter of the opening The larger mold is pulled out to perform die cutting. There are the following problems in die cutting by force.

  First, forcible punching is performed by deforming the opening part before the resin is completely cooled and solidified, so that it is difficult to obtain a molded product that faithfully reproduces the shape of the molding surface of the mold. In particular, since the dimensional accuracy of the opening of the container body is low, the airtightness in a state where the lid is attached is low. For example, containers used for filling cosmetics are required to have high airtightness with a lid attached to the container body. This is for preventing leakage of the contents and the internal gas due to the expansion of the contents and the internal gas even when placed in a high temperature indoor environment with the cosmetic filled. However, if the dimensional accuracy of the opening of the container body is low, the airtightness varies from product to product even through the packing. For this reason, when the container body is forcibly punched, it is difficult to satisfy the required airtightness.

  In addition, forcible punching, it is difficult to punch the mold when the undercut has a deep step shape. Therefore, the undercut is shallow and needs to be formed with a smooth curved surface to facilitate punching. Due to limitations on the depth and shape of the undercut, the thickness of the body portion of the container body may not be sufficiently thin, or an extra thick portion may be formed on the inner peripheral surface of the shoulder portion. For this reason, the amount of resin used cannot be reduced, and it is difficult to manufacture at low cost.

  In addition, forcible punching, the mold is punched by deforming the opening before the resin is completely cooled and solidified, so multiple molding conditions such as resin temperature and punching timing are managed in a pinpoint manner. Must. If the molding conditions are not met, defective products are generated. However, it is difficult to manage a plurality of molding conditions in a pinpoint manner, and the defect rate is inevitably high, so that it is difficult to manufacture at a low cost.

  In other words, as a technique for molding a wide-mouthed container with an undercut inside the container body by injection molding, a technique for forcibly removing the mold has been conventionally known. It was difficult to satisfy. Moreover, it was difficult to produce a container at low cost without forcing it.

  An injection molding technique using a so-called collapsible core is also known as a technique for injection molding a wide-mouthed container having an undercut. The collapsible core is a mold whose diameter is reduced inward by pulling the center pin of the equally divided core. When the collapsible core is used, the diameter of the mold can be reduced at the time of punching, so that it is possible to punch the mold without forcibly removing it. However, when a collapsible core is used, there is a problem that a partition line is formed at a position corresponding to the split surface of the collapsible core in the container body. When a partition line is formed at the opening of the neck of the container body, particularly at the end of the opening, the contact pressure of the packing and the lid becomes uneven due to the slight unevenness of the partition line, and the airtightness is reduced. There is a problem that the contents and internal gas leak from the portion where the contact pressure is low.

JP 2003-155020 A JP 2005-112444 A

  The present invention has been made to solve the above problems. The first object of the present invention is to form a wide-mouthed container having an undercut inside the container body by injection molding and to improve the airtightness of the container. The second object of the present invention is to produce the container at a low cost.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the injection mold of the container of the first invention is an injection mold of a container having an undercut inside the container body,
A neck inner mold having a first molding surface continuous in the circumferential direction for molding the end of the opening from the inner circumferential surface of the neck of the container body;
One of the undercuts that penetrate the neck inner mold and are continuous from a part of the inner peripheral surface of the body part of the container main body and from the inner peripheral surface of the body part of the container main body to the inner peripheral surface of the neck part. A pair of first slide cores having a second molding surface for molding the part;
One of the undercuts that penetrate the neck inner mold and are continuous from a part of the inner peripheral surface of the body part of the container main body and from the inner peripheral surface of the body part of the container main body to the inner peripheral surface of the neck part. A pair of second slide cores having a third molding surface for molding the part;
A core block that penetrates the inner neck mold and is disposed in a region surrounded by the pair of first slide cores and the pair of second slide cores;
With
The pair of first slide cores move in the first direction relative to the core block together with the neck inner mold, so that the second molding surface is the first molding of the neck inner mold. Move radially inward of the neck of the container body from the surface,
Subsequently, the pair of second slide cores are further moved in the first direction relative to the neck inner mold, the first slide core, and the core block, so that the third molding is performed. The surface moves radially inward of the neck of the container body from the first molding surface of the neck inner mold,
This is a mold for container injection molding.

The container injection molding mold of the second invention is the container injection molding mold of the first invention,
The first slide core includes a first support portion that penetrates the cervical inner die, and the second slide core includes a second support portion that penetrates the cervical inner die,
A fixed mold to which the core block is fixed;
The first support portion of the pair of first slide cores can be moved in the first direction with respect to the fixed die, holds the neck inner die, and the neck inner die. A first slide plate slidably held in the radial direction of the neck of the container body;
It is movable in the first direction with respect to the fixed mold and the core block, and the second support part of the pair of second slide cores is slidable in the radial direction of the neck part of the container body. A second slide plate to hold;
Further comprising
When the first slide plate and the second slide plate move in the first direction with respect to the fixed mold, the pair of first slide cores and the neck inner mold have the core block The first support portion of the pair of first slide cores moves radially inward of the neck portion of the container body with respect to the neck inner mold. The second molding surfaces of the pair of first slide cores move to the radially inner side of the neck of the container body from the first molding surface of the neck inner mold,
Subsequently, the second slide plate is further moved in the first direction with respect to the fixed mold and the first slide plate, so that the pair of second slide cores are the neck inner mold, Further moving in the first direction relative to the first slide core and the core block, the second support portions of the pair of second slide cores are Moving in the axial direction of the second support portion, the third molding surface of the pair of second slide cores is radially inward of the neck portion of the container body from the first molding surface of the neck inner mold Go to the
This is a mold for container injection molding.

The container injection molding method of the third invention is an injection mold for the container of the second invention,
The core block has a substantially rectangular fifth molding surface for molding a central portion of the inner surface of the bottom of the container body, a first smooth surface in contact with the first slide core, and a second surface in contact with the second slide core. Two smooth surfaces,
The pair of first slide cores includes a sixth molding surface for molding a portion opposed to the inner surface of the bottom portion of the container body across the portion molded by the fifth molding surface, and the core block A third smooth surface in contact with the first smooth surface; and a fourth smooth surface in contact with the second slide core;
The pair of second slide cores is a first part for molding a part other than a part molded by the fifth molding surface and a part molded by the sixth molding surface, of the inner surface of the bottom of the container body. A molding surface, and a second smooth surface of the core block and a fifth smooth surface in contact with the first slide core,
The pair of first slide cores moves the fourth sliding surface when the second molding surface moves so as to be radially inward of the neck portion of the container body from the first molding surface of the neck inner mold. Moving the surface while contacting the pair of second slide cores,
When the pair of second slide cores move so that the third molding surface is radially inward of the neck of the container body with respect to the first molding surface of the cervical inner mold, Moving the surface in contact with the pair of first slide cores,
This is a mold for container injection molding.

The container of the fourth invention is a container having an undercut inside the container body,
The inner surface of the bottom of the container main body, the inner peripheral surface of the trunk of the container main body, and the undercut continuous from the inner peripheral surface of the trunk of the container main body to the inner peripheral surface of the neck It has a plurality of partition lines by the molding surface of the divided injection mold,
The partition line is formed by a pair of first slide cores, a pair of second slide cores, a pair of first slide cores, and a core block disposed in a region surrounded by the pair of second slide cores. And
From the inner peripheral surface of the neck of the container body to the end of the opening does not have a partition line,
Container.

The container of the fifth invention has an undercut inside the container body,
On the inner surface of the bottom portion of the container body, it has a plurality of partition lines by the molding surface of the injection mold divided into a plurality of parts,
From the inner peripheral surface of the neck of the container body to the end of the opening, the container does not have a partition line,
The injection mold for molding the container body is:
A substantially rectangular fifth molding surface for molding the center of the inner surface of the bottom of the container body;
Of the inner surface of the bottom of the container body, a sixth molding surface for molding a portion facing the portion molded by the fifth molding surface;
Of the inner surface of the bottom of the container main body, a seventh molding surface for molding a portion other than a portion molded by the fifth molding surface and a portion molded by the sixth molding surface;
Have
The partition line on the inner surface of the bottom of the container body includes a first partition line formed by the fifth molding surface and the sixth molding surface, a second partition line formed by the fifth molding surface and the seventh molding surface, 6 molding surfaces and a third partition line by the seventh molding surface ,
Container.

The container of the sixth invention has an undercut inside the container body,
The inner surface of the bottom of the container main body, the inner peripheral surface of the trunk of the container main body, and the undercut continuous from the inner peripheral surface of the trunk of the container main body to the inner peripheral surface of the neck It has a plurality of partition lines by the molding surface of the divided injection mold,
From the inner peripheral surface of the neck of the container body to the end of the opening does not have a partition line,
A container,
The injection mold for molding the container body is:
A neck inner mold having a first molding surface continuous in the circumferential direction for molding the end of the opening from the inner circumferential surface of the neck of the container body;
A core block having a substantially square fifth molding surface for molding the central portion of the inner surface of the bottom of the container body;
Of the inner surface of the bottom portion of the container body, a sixth molding surface for molding a portion facing the portion molded by the fifth molding surface and a portion molded by the sixth molding surface are continuous. A second molding surface for molding a part of the inner peripheral surface of the body portion of the container main body and a part of an undercut continuous from the inner peripheral surface of the body portion of the container main body to the inner peripheral surface of the neck portion. A pair of first slide cores,
Of the inner surface of the bottom of the container body, a seventh molding surface for molding a portion other than a portion molded by the fifth molding surface and a portion molded by the sixth molding surface, and the seventh molding A part of the inner peripheral surface of the body portion of the container body that is continuous from the portion molded on the surface, and a part of the undercut that is continuous from the inner surface of the body portion of the container body to the inner peripheral surface of the neck portion A pair of second slide cores having a third molding surface for molding
With
The inner surface of the bottom of the container body has a first partition line formed by the core block and the first slide core, a second partition line formed by the core block and the second slide core, the first slide core, and the first slide core. A third partition line with two slide cores,
The undercut that is continuous with the inner peripheral surface of the trunk of the container body and the inner peripheral surface of the neck has a fourth partition line by the first slide core and the second slide core.
Container.

The container of the seventh invention is a container molded using the injection mold of the container of any one of the first to third inventions.

The container of the eighth invention is an injection molding method of a container using the mold for injection molding of the container of any one of the first to third inventions,
The injection mold further includes a main body outer mold having a fourth molding surface for molding the outer peripheral surface of the body portion of the container main body,
Placing the label so as to surround the second molding surface of the first slide core and the third molding surface of the second slide core before injecting the synthetic resin into the cavity,
This is an injection molding method for containers.

The container of the ninth invention is the container of any of the fourth to seventh inventions,
A label that substantially goes around the outer peripheral surface of the body portion of the container body is in-mold molded,
The both ends of the label do not overlap, and the part is the remaining amount visualizing part of the contents,
It is a container.

  ADVANTAGE OF THE INVENTION According to this invention, the wide-mouthed container which has an undercut inside a container main body can be shape | molded by injection molding, and the molded product which faithfully reproduced the shape of the molding surface of a metal mold | die can be obtained. Further, no partition line is formed from the inner peripheral surface of the neck of the container body to the end of the opening. For this reason, the contact pressure of the packing and the lid becomes uniform, and a highly airtight container can be obtained. Moreover, since the amount of resin used can be reduced and the defect rate can be reduced by reducing the thickness of the undercut portion and the body portion of the container body, the container can be manufactured at low cost. .

The side view of the container 100 which concerns on embodiment of this invention. (A) End view of the container 100 with the lid 120 attached to the container body 110 via the packing 130 (B) Cut end view of the container body 110 with the lid 120 and packing 130 removed. The cross-sectional simplified view explaining the injection mold 200 of the container 100 which concerns on embodiment of this invention. FIG. 4 is a simplified cross-sectional view illustrating an injection mold 200 cut in a direction orthogonal to FIG. 3. FIG. 6 is a simplified plan view illustrating a combination of the first slide core 50, the second slide core 60, and the core block 70 in a state where the injection mold 200 is clamped. The cross-sectional simplified view explaining the mold opening process of the metal mold | die 200 for injection molding. FIG. 7 is a simplified cross-sectional view illustrating an injection mold 200 opening process cut in a direction orthogonal to FIG. 6. The cross-sectional simplified view explaining the mold opening process of the metal mold | die 200 for injection molding. FIG. 9 is a simplified cross-sectional view illustrating an injection mold 200 opening process cut in a direction orthogonal to FIG. 8. The cross-sectional simplified view explaining the mold opening process of the metal mold | die 200 for injection molding. FIG. 11 is a simplified cross-sectional view illustrating an injection mold 200 opening process cut in a direction orthogonal to FIG. 10. (A) Side view of container body 110 and label 150 (B) Side view showing a state in which the label 150 is integrally molded with the container body 110. (A) Sectional drawing which cut | disconnected the container main body 110 in the height direction. (B) The top view which shows the inner surface of the bottom part 119 of the container main body 110. FIG.

  The container 100 which is an example of embodiment of this invention, the injection mold 200 for injection-molding the container main body 110 of the container 100, and the injection molding method are demonstrated using figures. First, the outline of the container 100 will be described with reference to FIG.

  As shown in FIGS. 1 and 2, the container 100 is a wide-mouthed container made of synthetic resin for filling creamy cosmetics. The container 100 includes a container main body 110, a lid 120, and a packing 130.

  The container main body 110 has a trunk 111, a neck 112, and a shoulder 113. The shoulder portion 113 is a portion where the outer diameter and inner diameter change from the neck portion 112 to the trunk portion 111. An undercut 114 that changes the inner diameter D1 of the opening 117 of the neck portion 112 to the inner diameter D2 of the trunk portion 111 is formed on the inner peripheral surface of the shoulder portion 113. By forming the undercut 114, the resin thickness T1 in the neck portion 112 and the resin thickness T2 in the trunk portion 111 can be made substantially the same. Further, the step between the container main body 110 and the lid 120 is made small with the lid 120 attached to the container main body 110. The neck 112 has a circular cross-sectional shape, and a male screw 115 for attaching the lid 120 is formed on the outer peripheral surface of the neck 112.

  A recess 116 is formed in the bottom 119 of the container body 110. The concave portion 116 has a shape that fits into the convex portion 122 formed on the upper portion of the lid portion 120. When stacking the plurality of containers 100, the stacked containers 100 are less likely to slide down by fitting the recesses 116 of the container body 110 and the protrusions 122 of the lid 120.

  The lid portion 120 has a female screw 121 corresponding to the male screw 115 formed on the inner peripheral surface. A packing 130 is attached inside.

  As the material of the packing 130, for example, a material mainly composed of a rubber material or a material mainly composed of a resin material can be used. If the dimensional accuracy of the opening 117 of the neck portion 112 of the container body 110, particularly the dimensional accuracy of the end portion 118 of the opening 117 is low, or if a partition line is formed, airtightness cannot be maintained even if the packing 130 is used. . However, since the container 100 according to the present embodiment is molded using the injection mold 200 described below, the dimensional accuracy of the opening 117 of the neck 112 is high, and the neck 112 of the container main body 110 is high. Since no partition line is formed from the inner peripheral surface to the end portion 118 of the opening 117, the contact pressure of the packing 130 and the lid portion 120 becomes uniform, and airtightness can be improved.

  As shown in FIG. 12, on the outer peripheral surface of the barrel portion 111 of the container 100, a label 150 on which a product name, a country of manufacture, a usage method, and the like are described is integrally formed by in-mold label molding. In-mold molding is a technique widely used in injection molding and blow molding. In the container 100 of the present embodiment, the container body 110 is molded using the injection mold 200 described below, and therefore, the label 150 can be integrally formed with the container body 110 by in-mold label molding. The label 150 is formed of a film such as OPP (polypropylene). By integrally molding the label 150 on the container main body 110, secondary processing for decorating the appearance of the container main body 110, such as printing or hot stamping, becomes unnecessary, and the container 100 can be manufactured at low cost. it can.

  As shown in FIGS. 1 and 2, the container 100 of the present embodiment is slightly expanded in diameter as the outer peripheral surface of the body 111 of the container main body 110 moves from the bottom 119 side to the shoulder 113 side, and slightly outward. It is a curved surface that bulges. Therefore, the shape of the label 150 is not a simple rectangle, but a shape along the outer peripheral surface of the container body 110, as shown in FIG. 12A. FIG. 12A is a diagram showing the position of the label 150 in the height direction of the container body 110. As shown in FIG. 12B, the label 150 is integrally molded in a state of being wound around the outer peripheral surface of the container main body 110 substantially as shown in FIG. 12B. As shown in FIG. 12A, specifically, the shape of the label 150 is curved so that the first long side 151 and the second long side 152 of the label 150 protrude toward the neck 112 of the container body 110, respectively. ing. Further, the first short side 153 and the second short side 154 of the label 150 are slightly curved so as to protrude in the circumferential direction of the container body 110, respectively. For this reason, as shown in FIG. 12B, the first long side 151 and the second long side 152 are parallel to the neck 112 and the bottom 119, respectively, in a state where the label 150 is integrally formed on the outer peripheral surface of the container body 110. It arrange | positions and the 1st short side 153 and the 2nd short side 154 will be arrange | positioned substantially parallel mutually, and the external appearance of the container 100 becomes favorable.

  In this embodiment, as shown in FIG. 12B, the gap 155 is formed so that the first short side 153 and the second short side 154 of the label 150 do not overlap. It can also be used as a visual recognition part. For example, the container body 110 is formed of a highly light-transmitting resin, and the label 150 is a film colored so as to have a low light-transmitting property. By integrally molding the label 150 on the container body 110, the gap 155 between the first short side 153 and the second short side 154 of the label 150 becomes a translucent window portion. It becomes a residual amount visual recognition part.

  Next, an injection mold 200 for injection molding the container 100 will be described. In the following description, as shown in FIGS. 3 to 11, the side on which the fixed mold 10 is disposed is the lower side, and the side on which the main body outer mold 40 that is a movable mold is disposed is the upper side. The direction in which the first slide core 50 slides is the left-right direction, and the direction in which the second slide core 60 slides is the front-rear direction. The form of the injection mold 200 is not limited to the embodiment described below.

  As means for operating each part of the injection molding die 200 by a molding machine, known means can be used, and detailed description and illustration are omitted.

  In the following description, “release” means a state in which the molding surface of the mold is separated from the molded body. Further, “die removal” means a state in which the die is passed through the undercut of the molded body and the die is removed.

  3, 4, and 5 show a state where the injection mold 200 is clamped. The injection mold 200 mainly includes a fixed mold 10, a first slide plate 20, a second slide plate 30, a main body outer mold 40, a first slide core 50, a second slide core 60, a core block 70, and a neck portion. The outer mold 80 and the cervical inner mold 90 are configured.

  The outline of the injection mold 200 will be described. The core block 70 is disposed in a region surrounded by the pair of first slide cores 50 and the pair of second slide cores 60. The pair of first slide cores 50, the pair of second slide cores 60, and the core block 70 penetrate the neck inner mold 90. The neck inner mold 90 has a first molding surface 91 for molding the end portion 118 of the opening 117 from the inner peripheral surface of the neck 112 of the container body 110. The first slide core 50 includes a second molding surface 51 that molds a part of the inner peripheral surface of the body 111 of the container main body 110 and a sixth molding surface 54 that molds a part of the inner surface of the bottom 119 of the container main body 110. Have The second slide core 60 has a third molding surface 61 that molds a part of the inner peripheral surface of the body 111 of the container body 110 and a seventh molding surface 63 that molds a part of the inner surface of the bottom 119 of the container body 110. Have The main body outer mold 40 has a fourth molding surface 41 that molds the outer peripheral surface of the container main body 110. The core block 70 has a fifth molding surface 74 that molds a part of the inner surface of the bottom 119 of the container body 110.

  The core block 70 has a first smooth surface 71 that contacts the first slide core 50 and a second smooth surface 72 that contacts the second slide core 60. The first slide core 50 has a third smooth surface 55 that contacts the first smooth surface 71 of the core block 70 and a fourth smooth surface 56 that contacts the second slide core 60. The second slide core 60 has a second smooth surface 72 of the core block 70 and a fifth smooth surface 64 in contact with the first slide core 50.

  Next, the configuration of the injection mold 200 will be specifically described. The fixed mold 10 has a portion having a substantially concave cross-sectional shape. A second slide plate 30 and a core block 70 are disposed inside the substantially concave portion. A first slide plate 20 is disposed above the fixed mold 10. When the first slide plate 20 shifts from the clamped state (see FIGS. 3 and 4) to the mold open state (see FIGS. 8 to 11), the first slide plate 20 is relatively above the fixed mold 10 ( In the first direction). The first slide plate 20 holds the neck inner mold 90 and the pair of first slide cores 50.

  The cervical inner mold 90 is fixed to the first slide plate 20. The cervical inner mold 90 has a first molding surface 91. The first molding surface 91 molds the end portion 118 of the opening 117 from the inner peripheral surface of the neck portion 112 of the container main body 110. The first molding surface 91 is continuous in the circumferential direction of the inner peripheral surface of the neck 112. “Continuous in the circumferential direction” means that the first molding surface 91 is formed as a continuous integral mold, and no partition line is formed. This improves the dimensional accuracy of the end portion 118 of the opening 117 from the inner peripheral surface of the neck portion 112 of the container body 110, which is a molded body, and prevents the formation of partition lines.

  The first slide core 50 has a second molding surface 51 and a sixth molding surface 54. The second molding surface 51 molds a part of the inner peripheral surface of the body 111 of the container body 110 in the circumferential direction and a part of the undercut 114 in the circumferential direction continuous to the inner peripheral surface of the neck 112. The sixth molding surface 54 molds a portion of the inner surface of the bottom portion 119 of the container body 110 that is opposed to the portion molded by the fifth molding surface 74 of the core block 70.

  The first slide core 50 has a first support portion 52. The first support part 52 penetrates the inside of the neck inner mold 90. At the end of the first support portion 52, the first slide core 50 slides in the radial direction of the first molding surface 91 of the cervical inner mold 90, that is, in the radial direction of the neck portion 112 of the container body 110 that is a molded body. It is sandwiched between the first slide plate 20 and the cervical inner mold 90 so as to be free.

  The first slide core 50 has a third smooth surface 55 that contacts the first smooth surface 71 of the core block 70, and a fourth smooth surface 56 that contacts the second slide core 60. When the first slide core 50 shifts from the clamped state (see FIGS. 3 to 5) to the mold open state (see FIGS. 8 and 9), the first slide core 50 is relatively above the core block 70 ( It is configured to be movable inward in the radial direction of the neck inner mold 90 along the first smooth surface 71 of the core block 70 and the second slide core 60 by moving in the first direction). .

  A cervical outer die 80 is disposed above the cervical inner die 90. The neck outer mold 80 molds the outer peripheral surface of the neck 112 of the container body 110 and the male screw 115. The neck outer mold 80 moves in the front-rear direction as shown in FIGS. 4 and 7 when the mold is opened. Note that, after the neck outer die 80 is opened, the neck outer die 80 is not shown in FIGS. 6, 8, and 10.

  When the second slide plate 30 shifts from the clamped state (see FIGS. 3 and 4) to the mold open state (see FIGS. 8 to 11), the second slide plate 30 is relatively above the fixed mold 10 ( In the first direction). The second slide plate 30 holds a pair of second slide cores 60.

  The second slide core 60 has a third molding surface 61 and a seventh molding surface 63. The third molding surface 61 molds a part of the inner peripheral surface of the body 111 of the container body 110 in the circumferential direction and a part of the undercut 114 in the circumferential direction continuous to the inner peripheral surface of the neck 112. The seventh molding surface 63 is a portion formed by the fifth molding surface 74 of the core block 70 and a portion molded by the sixth molding surface 54 of the first slide core 50 in the inner surface of the bottom 119 of the container body 110. Mold other parts.

  The second slide core 60 has a second support part 62. The second support part 62 passes through a hole 92 formed obliquely in the neck inner mold 90. The second support part 62 can advance and retreat along the hole 92. The end of the second support portion 62 is slidable in the radial direction of the first molding surface 91 of the neck inner mold 90, that is, in the radial direction of the neck 112 of the container body 110 that is a molded body. 2 is held by a slide plate 30.

  The second slide core 60 has a second smooth surface 72 of the core block 70 and a fifth smooth surface 64 in contact with the first slide core 50. When the second slide core 60 shifts from the clamped state (see FIGS. 3 to 5) to the mold open state (see FIGS. 10 and 11), the second slide plate 30 is attached to the cervical inner mold 90. , And moving upward relative to the core block 70 (first direction) so as to move radially inward of the cervical inner die 90 along the hole 92 of the cervical inner die 90. It is configured. At this time, the second slide core 60 is in contact with the first slide core 50 and is relatively above (first direction) relative to the first slide core 50, the core block 70, and the neck inner mold 90. Move to.

  The core block 70 is fixed inside the fixed mold 10. The fixed mold 10 passes through the second slide plate 30 and the neck inner mold 90. The core block 70 is disposed in a region surrounded by the pair of first slide cores 50 and the pair of second slide cores 60. A fifth molding surface 74, a first smooth surface 71, and a second smooth surface 72 are formed on the upper portion of the core block 70.

  The fifth molding surface 74 is substantially square, and molds the central portion of the inner surface of the bottom portion 119 of the container body 110. The first smooth surface 71 faces the pair of first slide cores 50 and contacts the first slide cores 50. The second smooth surface 72 faces the pair of second slide cores 60 and contacts the second slide core 60. A protrusion 73 having a T-shaped cross section is formed on the first smooth surface 71. The ridge 73 is engaged with a groove 53 having a T-shaped cross section formed in the first slide core 50. Since the groove 53 is engaged with the protrusion 73, the first slide core 50 can move along the first smooth surface 71 of the core block 70 to the inside in the radial direction of the neck inner mold 90.

  A main body outer die 40 is disposed above the first slide plate 20. The main body outer mold 40 has a fourth molding surface 41. The fourth molding surface 41 molds the outer peripheral surface of the body portion 111 of the container main body 110. The main body outer mold 40 is provided with a sprue runner portion 42 for injecting molten synthetic resin into the cavity C. The main body outer mold 40 is provided with a plurality of suction holes (not shown) for suction on the fourth molding surface 41 in order to suck the label onto the fourth molding surface 41 when performing in-mold label molding.

  Next, the operation of injection molding by the injection mold 200 will be described. 3 and 4 show a state where the cavity C is formed by clamping the injection mold 200. The cavity C includes a main body outer mold 40, a first slide core 50, a second slide core 60, a core block 70, a cervical outer mold 80, and a cervical inner mold 90. When performing in-mold molding, a label is wound around the first slide core 50 and the second slide core 60 before clamping. After the mold 200 for injection molding is clamped, the label is adsorbed to the fourth molding surface 41 by the suction holes (not shown) for adsorption formed in the main body outer mold 40. The synthetic resin melted in this state is injected from the sprue runner portion 42 into the cavity C. After injecting the synthetic resin into the cavity C, the process proceeds to the mold opening process in a state where the container body 110 which is a molded body is cooled and solidified.

  Next, the mold opening process of the injection mold 200 will be described. First, as shown in FIGS. 6 and 7, the main body outer mold 40 moves upward, and the neck outer mold 80 moves in the front-rear direction. Thereby, the main body outer side mold | type 40 is mold-released from the outer peripheral surface of the trunk | drum 111 of the container main body 110 which is a molded object. Further, the cervical outer die 80 is released from the outer peripheral surface of the cervical portion 112 of the container body 110 which is a molded body.

  Next, as shown in FIGS. 8 and 9, the first slide plate 20 and the second slide plate 30 move relatively upward (first direction) with respect to the fixed mold 10. Since the core block 70 is fixed to the fixed mold 10, the pair of first slide cores 50 moves upward (first direction) relative to the core block 70 together with the cervical inner mold 90. When the first slide core 50 moves upward (in the first direction) relative to the core block 70, the first slide core 50 moves inward in the radial direction of the cervical inner mold 90 along the first smooth surface 71 of the core block 70. To do. Then, the second molding surface 51 of the first slide core 50 moves to the radially inner side of the neck 112 of the container body 110 from the first molding surface 91 of the neck inner mold 90, and the second inner surface 90 of the neck inner mold 90 is moved. It moves radially inward from the inner peripheral surface of the neck 112 molded by the one molding surface 91. At this time, the first slide core 50 moves while the fourth smooth surface 56 is in contact with the second slide core 60.

  Thereby, the 2nd molding surface 51 of the 1st slide core 50 is released from the inner peripheral surface of the trunk | drum 111 of the container main body 110 which is a molded object, and the undercut 114. FIG. In this state, the first slide core 50 can pass through the opening 117 of the neck 112 of the container body 110 that is a molded body, and can be punched.

  Subsequently, as shown in FIGS. 10 and 11, the second slide plate 30 moves further upward (in the first direction) relative to the stationary mold 10 and the first slide plate 20. The second slide core 60 moves further upward (first direction) relative to the neck inner mold 90, the first slide core 50, and the core block 70, and the second slide core 60 The support part 62 moves in the axial direction of the second support part 62 with respect to the neck inner mold 90. Then, the third molding surface 61 of the second slide core 60 moves to the radially inner side of the neck 112 of the container body 110 from the first molding surface 91 of the neck inner mold 90, and the third molding surface 61 of the neck inner mold 90 is moved. It moves radially inward from the inner peripheral surface of the neck 112 molded by the one molding surface 91. At this time, the second slide core 60 moves while the fifth smooth surface 64 is in contact with the first ride core 50.

  Thereby, the 2nd slide core 60 is released from the internal peripheral surface of the trunk | drum 111 of the container main body 110 which is a molded object, and the undercut 114. FIG. In this state, the second slide core 60 can be punched through the opening 117 of the neck 112 of the container body 110 that is a molded body.

  Further, when the second slide core 60 is released from the container body 110 which is a molded body, the second slide core 60 is relatively above the first slide core 50, the core block 70, and the neck inner mold 90 (first Therefore, the container body 110 that is a molded body is punched out so as to be protruded by the second slide core 60. That is, the container body 110 that is a molded body can be punched from the first slide core 50, the core block 70, and the neck inner mold 90 without separately providing a protruding means. Thereafter, the container main body 110 as a molded body is die-cut from the second slide core 60 by a take-out device (not shown), and the mold opening process of the injection mold 200 is completed.

  The container 100 manufactured by the above-described injection mold 200 includes an inner surface of the bottom portion 119 of the container main body 110, an inner peripheral surface of the trunk portion 111 of the container main body 110, and an inner peripheral surface of the trunk portion 111 of the container main body 110. A plurality of partition lines are formed in the undercut 114 continuous from the inner peripheral surface of the neck portion 112 to the molding surface of the injection mold 200 divided into a plurality of portions. On the other hand, no partition line is formed from the inner peripheral surface of the neck 112 of the container body 110 to the end 118 of the opening 117.

  More specifically, on the inner surface of the bottom 119 of the container body 110, a first partition line PL1 formed by the core block 70 and the first slide core 50, and a second partition line PL2 formed by the core block 70 and the second slide core 60 are provided. And a third partition line PL3 formed by the first slide core 50 and the second slide core 60 is formed. A fourth partition line PL4 formed by the first slide core 50 and the second slide core 60 is formed in the undercut 114 that is continuous with the inner peripheral surface of the body 111 of the container body 110 and the inner peripheral surface of the neck 112. . Since the end portion 118 of the opening 117 from the inner peripheral surface of the neck portion 112 of the container body 110 is molded by the first molding surface 91 of the neck portion inner mold 90, a partition line is not formed.

  The container 100, the injection mold 200, and the injection molding method according to the present embodiment described above have the following effects.

  Since the end 118 of the opening 117 from the inner peripheral surface of the neck 112 of the container body 110 is molded by the neck inner mold 90 having the first molding surface 91 continuous in the circumferential direction, the inner periphery of the neck 112 The end 118 of the opening 117 can be accurately molded from the surface. In addition, since no partition line is formed at the end portion 118 of the opening 117, the packing 130 can be brought into uniform contact, and airtightness can be improved.

  An undercut 114 that is continuous with the inner peripheral surface of the body 111 of the container body 110 and the inner peripheral surface of the neck 112 is formed by the first slide core 50 and the second slide core 60. Since the first slide core 50 and the second slide core 60 are die-cut in a state of being moved inward from the neck inner die 90, the first slide core 50 and the second slide core 60 are not forcibly removed at the time of die-cutting. Since the 117 is not deformed, the end 118 of the opening 117 can be accurately molded from the inner peripheral surface of the neck 112.

  When the pair of first slide cores 50 moves so that the second molding surface 51 is located on the radially inner side of the neck 112 of the container body 110 with respect to the first molding surface 91 of the neck inner mold 90, The pair of second slide cores 60 moves while contacting the surface 56 with the pair of second slide cores 60, and the third molding surface 61 of the neck portion of the container body 110 is more than the first molding surface 91 of the neck inner mold 90. When moving so as to be radially inward of 112, the fifth smooth surface 64 moves while being in contact with the pair of first slide cores 50. By such a movement, the first slide core 50, the second slide core 60, and the core block 70 can be made compact in the mold opening process, so that even if the depth of the undercut 114 is increased, the die is removed. It can be carried out.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible.

DESCRIPTION OF SYMBOLS 100 Container 200 Injection mold 10 Fixed mold 20 First slide plate 30 Second slide plate 40 Main body outer side mold 41 Fourth molding surface 42 Sprue runner portion 50 First slide core 51 Second molding surface 52 First support portion 53 Groove 54 Sixth molding surface 55 Third smooth surface 56 Fourth smooth surface 60 Second slide core 61 Third molding surface 62 Second support portion 63 Seventh molding surface 64 Fifth smooth surface 70 Core block 71 First smooth surface 72 Second smooth surface 73 Projection 74 Fifth molding surface 80 Neck outer mold 90 Neck inner mold 91 First molding surface 92 Hole C cavity 110 Container body 111 Body 112 Neck 113 Shoulder 114 Undercut 115 Male screw 116 Concave portion 117 Opening portion 118 End portion 119 Bottom portion 120 Lid portion 121 Female screw 122 Convex portion 130 Packing 150 Label 151 First long side 152 Second long side 153 First short side 154 Second short side 155 Clearance PL1 First partition line PL2 Second partition line PL3 Third partition line PL4 Fourth partition line

Claims (9)

A mold for injection molding of a container having an undercut inside the container body,
A neck inner mold having a first molding surface continuous in the circumferential direction for molding the end of the opening from the inner circumferential surface of the neck of the container body;
An underside that penetrates the neck inner mold and is continuous from the inner peripheral surface of the body portion of the container main body to the inner peripheral surface of the neck portion of the container main body. A pair of first slide cores having a second molding surface for molding a part of the cut in the circumferential direction;
An underside that penetrates the neck inner mold and is continuous from the inner peripheral surface of the body portion of the container main body to the inner peripheral surface of the neck portion of the container main body. A pair of second slide cores having a third molding surface for molding a part of the circumferential direction of the cut;
A core block that penetrates the inner neck mold and is disposed in a region surrounded by the pair of first slide cores and the pair of second slide cores;
With
The pair of first slide cores move in the first direction relative to the core block together with the neck inner mold, so that the second molding surface is the first molding of the neck inner mold. Move radially inward of the neck of the container body from the surface,
Subsequently, the pair of second slide cores are further moved in the first direction relative to the neck inner mold, the first slide core, and the core block, so that the third molding is performed. The surface moves radially inward of the neck of the container body from the first molding surface of the neck inner mold,
Mold for container injection molding. A mold for injection molding of a container according to claim 1,
The first slide core includes a first support portion that penetrates the cervical inner die, and the second slide core includes a second support portion that penetrates the cervical inner die,
A fixed mold to which the core block is fixed;
The first support portion of the pair of first slide cores can be moved in the first direction with respect to the fixed die, holds the neck inner die, and the neck inner die. A first slide plate slidably held in the radial direction of the neck of the container body;
It is movable in the first direction with respect to the fixed mold and the core block, and the second support part of the pair of second slide cores is slidable in the radial direction of the neck part of the container body. A second slide plate to hold;
Further comprising
When the first slide plate and the second slide plate move in the first direction with respect to the fixed mold, the pair of first slide cores and the neck inner mold have the core block The first support portion of the pair of first slide cores moves radially inward of the neck portion of the container body with respect to the neck inner mold. The second molding surfaces of the pair of first slide cores move to the radially inner side of the neck of the container body from the first molding surface of the neck inner mold,
Subsequently, the second slide plate is further moved in the first direction with respect to the fixed mold and the first slide plate, so that the pair of second slide cores are the neck inner mold, Further moving in the first direction relative to the first slide core and the core block, the second support portions of the pair of second slide cores are Moving in the axial direction of the second support portion, the third molding surface of the pair of second slide cores is radially inward of the neck portion of the container body from the first molding surface of the neck inner mold Go to the
Mold for container injection molding. A mold for injection molding of a container according to claim 2,
The core block has a substantially rectangular fifth molding surface for molding a central portion of the inner surface of the bottom of the container body, a first smooth surface in contact with the first slide core, and a second surface in contact with the second slide core. Two smooth surfaces,
The pair of first slide cores includes a sixth molding surface for molding a portion opposed to the inner surface of the bottom portion of the container body across the portion molded by the fifth molding surface, and the core block A third smooth surface in contact with the first smooth surface; and a fourth smooth surface in contact with the second slide core;
The pair of second slide cores is a first part for molding a part other than a part molded by the fifth molding surface and a part molded by the sixth molding surface, of the inner surface of the bottom of the container body. A molding surface, and a second smooth surface of the core block and a fifth smooth surface in contact with the first slide core,
The pair of first slide cores moves the fourth sliding surface when the second molding surface moves so as to be radially inward of the neck portion of the container body from the first molding surface of the neck inner mold. Moving the surface while contacting the pair of second slide cores,
When the pair of second slide cores move so that the third molding surface is radially inward of the neck of the container body with respect to the first molding surface of the cervical inner mold, Moving the surface in contact with the pair of first slide cores,
Mold for container injection molding. A container having an undercut inside the container body,
The inner surface of the bottom of the container main body, the inner peripheral surface of the trunk of the container main body, and the undercut continuous from the inner peripheral surface of the trunk of the container main body to the inner peripheral surface of the neck It has a plurality of partition lines by the molding surface of the divided injection mold,
The partition line is formed by a pair of first slide cores, a pair of second slide cores, a pair of first slide cores, and a core block disposed in a region surrounded by the pair of second slide cores. And
From the inner peripheral surface of the neck of the container body to the end of the opening does not have a partition line,
container. Has an undercut inside the container body,
On the inner surface of the bottom portion of the container body, it has a plurality of partition lines by the molding surface of the injection mold divided into a plurality of parts,
From the inner peripheral surface of the neck of the container body to the end of the opening, the container does not have a partition line,
The injection mold for molding the container body is:
A substantially rectangular fifth molding surface for molding the center of the inner surface of the bottom of the container body;
Of the inner surface of the bottom of the container body, a sixth molding surface for molding a portion facing the portion molded by the fifth molding surface;
Of the inner surface of the bottom of the container main body, a seventh molding surface for molding a portion other than a portion molded by the fifth molding surface and a portion molded by the sixth molding surface;
Have
The partition line on the inner surface of the bottom of the container body includes a first partition line formed by the fifth molding surface and the sixth molding surface, a second partition line formed by the fifth molding surface and the seventh molding surface, 6 molding surfaces and a third partition line by the seventh molding surface ,
container. Has an undercut inside the container body,
The inner surface of the bottom of the container main body, the inner peripheral surface of the trunk of the container main body, and the undercut continuous from the inner peripheral surface of the trunk of the container main body to the inner peripheral surface of the neck It has a plurality of partition lines by the molding surface of the divided injection mold,
From the inner peripheral surface of the neck of the container body to the end of the opening does not have a partition line,
A container,
The injection mold for molding the container body is:
A neck inner mold having a first molding surface continuous in the circumferential direction for molding the end of the opening from the inner circumferential surface of the neck of the container body;
A core block having a substantially square fifth molding surface for molding the central portion of the inner surface of the bottom of the container body;
Of the inner surface of the bottom portion of the container body, a sixth molding surface for molding a portion facing the portion molded by the fifth molding surface and a portion molded by the sixth molding surface are continuous. A second molding surface for molding a part of the inner peripheral surface of the body portion of the container main body and a part of an undercut continuous from the inner peripheral surface of the body portion of the container main body to the inner peripheral surface of the neck portion. A pair of first slide cores,
Of the inner surface of the bottom of the container body, a seventh molding surface for molding a portion other than a portion molded by the fifth molding surface and a portion molded by the sixth molding surface, and the seventh molding A part of the inner peripheral surface of the body portion of the container body that is continuous from the portion molded on the surface, and a part of the undercut that is continuous from the inner surface of the body portion of the container body to the inner peripheral surface of the neck portion A pair of second slide cores having a third molding surface for molding
With
The inner surface of the bottom of the container body has a first partition line formed by the core block and the first slide core, a second partition line formed by the core block and the second slide core, the first slide core, and the first slide core. A third partition line with two slide cores,
The undercut that is continuous with the inner peripheral surface of the trunk of the container body and the inner peripheral surface of the neck has a fourth partition line by the first slide core and the second slide core.
container. Molded using the injection mold of the container according to any one of claims 1 to 3,
container. A container injection molding method using the container injection mold according to any one of claims 1 to 3,
The injection mold further includes a main body outer mold having a fourth molding surface for molding the outer peripheral surface of the body portion of the container main body,
Placing the label so as to surround the second molding surface of the first slide core and the third molding surface of the second slide core before injecting the synthetic resin into the cavity,
Container injection molding method. A container according to any one of claims 4 to 7,
A label that substantially goes around the outer peripheral surface of the body portion of the container body is in-mold molded,
The both ends of the label do not overlap, and the part is the remaining amount visualizing part of the contents,
container.

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