KR20140118683A - container, injection molding method of container, and mold for injection molding of container - Google Patents

Abstract

A container having a wide inlet and an undercut inside a container body is injection-molded to increase air tightness of the container and manufacture the container with low costs. For this, an injection-molding mold (200) includes: a neck part inner mold (90) having a successive molding surface for molding an end (118) of an opening (117) successively defined from an inner circumferential surface of a neck part (112) of a container body (110) in a circumferential direction; first and second slide cores (50, 60) passing through the neck part inner mold (90) and for forming an undercut (114) successively defined in an inner circumferential surface of a body (111) of the container body (110) and the inner circumferential surface of the neck part (112); and a core block (70) passing through the neck part inner mold (90), the core block (70) being disposed on an area surrounded by a pair of first slide cores (50) and a pair of second slide cores (60).

Description

TECHNICAL FIELD The present invention relates to a container, an injection molding method of a container, and a mold for injection molding of a container,

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

Conventionally, as containers for cosmetics for filling cosmetic products in cream form, for example, containers having wide openings are known. The container with a wide inlet is mainly composed of a container body, a packing, and a lid portion.

The lid part is mounted on the neck part of the container body. A container in which the outer diameter of the container body and the lid portion are substantially the same is also known. The container body of such a container is different in outer diameter of the body part and the neck part. When the outer diameter of the body portion and the neck portion of the container body is made different from each other, a portion (shoulder portion) whose outer diameter changes from the neck portion to the body portion is formed on the outer peripheral surface of the container body.

In the container in which the shoulder portion is formed, there are a type having an undercut on the inner peripheral surface of the shoulder portion and a type having no undercut.

In the type having no undercut on the inner peripheral surface of the shoulder portion, the outer diameter is larger than the neck portion, but the inner diameter is constant from the body portion to the neck portion. Since this type has no undercut, it is easy to unscrew molds when molding by injection molding means. However, the thickness of the trunk portion of the container body is thicker than the thickness of the neck portion, so that the amount of resin used increases. Further, since the thickness is thick, it is difficult for the resin to solidify and solidify during injection molding, which takes a lot of time for injection molding. Therefore, there is a problem that it is difficult to provide the container at low cost because the manufacturing cost is high.

On the other hand, in the type having an undercut on the inner circumferential surface of the shoulder portion, the deeper the undercut, the thinner the thickness of the body portion of the container body can be, and the smaller the amount of resin used can be. In addition, if the thickness is thin, the resin tends to be cooled and solidified at the time of injection molding, and the injection molding time can be shortened. Therefore, it is possible to reduce the manufacturing cost and to provide the container at low cost. However, since it has an undercut, it is difficult to mold the mold when it is molded by injection molding. For example, Patent Literatures 1 and 2 are known as techniques for manufacturing a wide container having an undercut by injection molding means.

In the injection molding technique of Patent Documents 1 and 2, the mold drawing of the mold is performed by so-called pull-out. Specifically, after a resin is injected into a cavity of an injection molding metal mold, a mold opening is performed before the resin is cooled and solidified to hold a mold larger than the inner diameter of the opening from the opening of the neck portion of the container body as a molding And draw out the template. There are the following problems in drawing the frame by this forced pulling.

First, the forced pulling operation is difficult to obtain a molded product in which the shape of the molding surface of the mold is faithfully reproduced, because the opening is deformed before the resin is completely cooled and solidified. In particular, since the dimensional accuracy of the opening portion of the container body is lowered, the airtightness in the state where the lid portion is attached is low. For example, a container used for filling cosmetics is required to have high airtightness in a state where a lid portion is mounted on a container body. This is to prevent leakage of contents or internal gas due to the contents or the expansion of the internal gas even when the room is placed in a high temperature environment while the cosmetic is charged. However, if the dimensional accuracy of the opening portion of the container body is low, there is a variation in the airtightness of each product even though the packing is interposed. For this reason, it is difficult to satisfy the required airtightness if the casting of the container body is performed by pulling out the casting.

In addition, since it is difficult to draw a mold by forming the undercut in a deep step shape, it is necessary to form the undercut in a shallow, smooth curved surface to facilitate drawing of the mold. However, due to the limitation of the depth and shape of the undercut, there is a case where the thickness of the body part of the container body can not be made sufficiently thin, or an extra thick part is formed on the inner circumferential surface of the shoulder part. For this reason, the amount of resin used can not be reduced and it is difficult to manufacture at low cost.

In addition, since the drawing of the mold is performed by deforming the opening portion before the resin is completely cooled and solidified, a plurality of molding conditions such as the temperature of the resin and the timing of drawing the mold must be managed by pinpoint . If the molding condition is deviated, a defective product is generated. However, it is difficult to manage a plurality of molding conditions by pinpointing, and since the defect rate increases, it is difficult to manufacture at low cost.

In other words, as a technique of molding a container having a wide opening having an undercut at the inner side of the container body by injection molding, there is known a technique of performing drawing by pulling out the conventional frame. However, it is difficult to satisfy the air- Respectively. Further, it has been difficult to manufacture the container at low cost by the forced pulling.

Further, injection molding technology using a so-called collapsible core is also known as a technique for injection molding a container having an undercut having a wide opening. The Kalpable core is a mold that has a reduced diameter inside by dividing the center pin by a divided core. With the use of the Klepable core, it is possible to reduce the size of the mold at the time of drawing the mold, so that it is possible to draw the mold without pulling the mold. However, there is a problem in that, when the cutter core is used, the partition line is formed in the container body at a position corresponding to the cut surface of the cutaway core. When the partition line is formed at the opening portion of the neck portion of the container body, particularly at the end portion of the opening portion, the contact and pressure of the packing and the lid portion are uneven due to the minute unevenness of the partition line, There is a problem that internal gas leaks.

Patent Document 1: JP-A-2003-155020 Patent Document 2: Japanese Patent Application Laid-Open No. 2005-112444

The present invention has been made to solve the above problems.

A first object of the present invention is to form a container having an opening with an undercut at the inner side of the container body by injection molding to further improve the airtightness of the container.

A second object of the present invention is to manufacture a container at low cost.

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

That is, the mold for injection molding of the container of the first invention is 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 portion of the opening portion from the inner peripheral surface of the neck portion of the container body,

And a second molding surface for forming a part of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion through the neck portion inner mold and a portion of the inner circumferential surface of the body portion of the container body A pair of first slide cores,

And a third molding surface for forming a part of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion through the neck mold inner mold and a portion of the inner circumferential surface of the body portion of the container body, A pair of second slide cores,

And a core block penetrating the inside of the neck portion and disposed in a region surrounded by the pair of first slide cores and the pair of second slide cores,

The pair of first slide cores moves in a first direction relative to the core block together with the neck inner side mold so that the second molding surface is positioned above the first molding surface of the neck portion inner mold Moves inward in the radial direction of the neck portion of the container body,

Subsequently, the pair of second slide cores move further in the first direction relative to the neck inner mold, the first slide core, and the core block, And moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck portion inner mold.

The mold for injection molding of the container of the second invention is a mold for injection molding of the container of the first invention,

Wherein the first slide core has a first support portion passing through the inside of the neck portion and the second slide core has a second support portion passing through the neck portion inner mold,

A stationary mold to which the core block is fixed,

Wherein the neck portion inner mold is movable in the first direction with respect to the fixed mold and supports the inner mold of the neck portion and the first support portion of the pair of first slide cores A first slide plate slidably supporting the neck portion of the container body in the radial direction,

And a second support member that is movable in the first direction with respect to the fixed mold and the core block and supports the second support portion of the pair of second slide cores so as to be slidable in the radial direction of the neck portion of the container body, Further comprising a slide plate,

The first slide plate and the second slide plate are moved in the first direction with respect to the fixed mold so that the pair of first slide cores and the neck portion inner mold are moved relative to the core block The first support portions of the pair of first slide cores move inward in the radial direction of the neck portion of the container body with respect to the neck portion inner mold, The second molding surface of the first slide core moves inward in the radial direction of the neck portion of the container main body from the first molding surface of the neck inner mold,

Subsequently, the second slide plate is moved further in the first direction with respect to the fixed mold and the first slide plate, so that the pair of second slide cores are fixed to the neck inner mold, One slide core, and the core block, and the second support portion of the pair of second slide cores is moved in the first direction relative to the neck core inner mold with respect to the second support portion And the third molding surface of the pair of second slide cores moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck portion inner mold. It is a mold for.

The injection molding method of the container of the third invention is a mold for injection molding of the container of the second invention,

The core block includes a substantially rectangular fifth shaping surface for forming a central portion of the inner surface of the bottom portion of the container body, a first slide surface in contact with the first slide core, a second slide in contact with the second slide core Take more cotton,

The pair of first slide cores includes a sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface with a portion to be formed therebetween, A third slide surface contacting one slide surface and a fourth slide surface contacting the second slide core,

Wherein the pair of second slide cores has a third molding surface for molding a portion of the inner surface of the bottom portion of the container body that is formed by the fifth molding surface and a portion other than the portion formed by the sixth molding surface, And a fifth slide surface contacting the second slide surface of the core block and the first slide core,

When the pair of first slide cores moves so that the second molding surface is inward in the radial direction of the neck portion of the container main body from the first molding surface of the neck portion inner mold, And is moved in contact with the second slide core of the second slide core,

Wherein the pair of second slide cores are configured such that when the third molding surface moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck inner mold, And moves while contacting the first slide core of the container.

A container according to a fourth aspect of the present invention is a container having an undercut on the inside of a container body,

Wherein an under surface of the bottom portion of the container body, an inner circumferential surface of the body portion of the container body, and an inner circumferential surface of the body portion of the container body are continuous to the inner circumferential surface of the neck portion, Take the line,

Wherein the partition line includes a pair of first slide cores, a pair of second slide cores, a pair of first slide cores, and a core block disposed in an area surrounded by the pair of second slide cores Respectively,

And is a container having no partition line at the end of the opening from the inner circumferential surface of the neck portion of the container main body.

The container of the fifth invention has an undercut on the inside of the container body,

A plurality of partition lines formed by molding surfaces of a plurality of divided injection molding dies on the inner surface of the bottom portion of the container main body,

As a container which does not have a partition line at the end of the opening from the inner circumferential surface of the neck portion of the container body,

The injection molding die for molding the container body comprises:

A substantially rectangular fifth molding surface for molding a central portion of the inner surface of the bottom portion of the container main body,

A sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface,

And a seventh molding surface for molding a portion of the inner surface of the bottom portion of the container main body other than the portion formed by the fifth molding surface and the portion formed by the sixth molding surface,

The partition line on the inner surface of the bottom portion 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, And a third partition line formed by the sixth molding surface and the seventh molding surface.

The container of the sixth invention has an undercut on the inside of the container body,

The inner surface of the bottom portion of the container body, the inner circumferential surface of the body portion of the container body, and the undercuts continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion are provided with a plurality of Having a partition line,

As a container which does not have a partition line at the end of the opening from the inner circumferential surface of the neck portion of the container body,

The injection molding die for molding the container body comprises:

A neck inner mold having a first molding surface continuous in the circumferential direction for forming an end portion of the opening portion from the inner circumferential surface of the neck portion of the container main body,

A core block having a substantially rectangular fifth shaping surface for forming a central portion of the inner surface of the bottom portion of the container main body;

A sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface through a portion to be molded therebetween; A pair of first slide cores having a second molding surface for forming a part of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion,

A seventh molding surface for molding a portion of the inner surface of the bottom portion of the container main body other than a portion formed by the fifth shaping surface and a portion formed by the sixth shaping surface; A pair of second slide cores each having a third molding surface for forming a part of an undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion, And,

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, and a second partition line formed by the first slide core and the second slide core, Having a third partition line by a second slide core,

In the undercut continuous with the inner circumferential surface of the body portion of the container body and the inner circumferential surface of the neck portion,

And a fourth partition line formed by the first slide core and the second slide core.

A container according to a seventh aspect of the present invention is a container formed using a mold for injection molding of a container according to any one of the first to third aspects.

A container according to an eighth aspect of the present invention is a container injection molding method using a mold for injection molding of a container according to any one of the first to third aspects,

The injection molding die further includes an outer body mold having a fourth molding surface for molding an outer peripheral surface of the body portion of the container body,

And a step of disposing 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 the synthetic resin is injected into the cavity.

The container of the ninth aspect of the present invention is the container of any one of the fourth to seventh aspects,

Wherein a label is formed in substantially the entire circumference of the body portion of the container body in an in-mold shape,

Both ends of the label are prevented from overlapping, and the portion is a portion which is a part of the remaining amount of the contents.

According to the present invention, it is possible to obtain a molded article in which a container having an inward opening with an undercut at the inner side of the container body is molded by injection molding to faithfully reproduce the shape of the molding surface of the mold.

Further, no partition line is formed at the end of the opening from the inner circumferential surface of the neck portion of the container main body. Therefore, the contact pressure of the packing and the lid portion becomes uniform, and a highly airtight container can be obtained.

Further, by reducing the thickness of the undercut portion and the body portion of the container main body, the amount of resin used can be reduced and the rate of defective can be reduced, so that the container can be manufactured at low cost.

1 is a side view of a container 100 according to an embodiment of the present invention.
2 (A) is a cross-sectional view of the container 100 of the container 100 with the lid 120 mounted through the packing 130, FIG. 2 (B) Sectional view in a state in which the lid 120 and the packing 130 are removed.
3 is a schematic cross-sectional view for explaining a mold 200 for injection molding of the container 100 according to the embodiment of the present invention.
Fig. 4 is a simplified cross-sectional view for explaining a mold 200 for injection molding cut in a direction orthogonal to Fig.
5 is a plan schematic view for explaining a combination of the first slide core 50, the second slide core 60, and the core block 70 in a state in which the mold 200 for injection molding is closed in a mold .
6 is a schematic cross-sectional view for explaining a mold opening process of the injection-molding mold 200. Fig.
Fig. 7 is a schematic cross-sectional view for explaining a mold opening process of the injection-molding mold 200 cut in a direction orthogonal to Fig.
8 is a schematic cross-sectional view for explaining a mold opening process of the injection-molding mold 200. Fig.
Fig. 9 is a schematic cross-sectional view for explaining the mold opening process of the injection-molding mold 200 cut in a direction orthogonal to Fig.
10 is a schematic cross-sectional view for explaining the mold opening process of the injection molding die 200. Fig.
11 is a schematic cross-sectional view for explaining a mold opening process of the injection-molding mold 200 cut in a direction orthogonal to Fig.
12A is a side view of the container body 110 and the label 150 and FIG. 12B is a side view showing a state in which the label 150 is integrally formed on the container body 110. FIG.
13A is a cross-sectional view of the container body 110 cut in the height direction, and FIG. 13B is a plan view showing the inner surface of the bottom 119 of the container body 110. FIG.

A container 100 as an embodiment of the present invention, a mold 200 for injection molding for injection molding of the container body 110 of the container 100, and an injection molding method will be described with reference to the drawings. 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 container made of a synthetic resin and filled with cream-form cosmetics. The container 100 has a container body 110, a lid 120, and a packing 130.

The container body 110 has a body portion 111, a neck portion 112, and a shoulder portion 113. The shoulder portion 113 is a portion where the outer diameter and the inner diameter change from the neck portion 112 to the body portion 111. [ An undercut 114 is formed on the inner circumferential surface of the shoulder 113 to change from the inner diameter D1 of the opening 117 of the neck portion 112 to the inner diameter D2 of the trunk portion 111. [ By forming the undercut 114, it is possible to make the thickness T1 of the resin in the neck portion 112 and the thickness T2 of the resin in the body 111 substantially equal. The step between the container body 110 and the lid 120 is reduced in a state where the lid 120 is attached to the container body 110. [ The neck portion 112 has a circular cross-sectional shape, and a male screw 115 for mounting the lid portion 120 is formed on the outer circumferential surface of the neck portion 112.

A concave portion 116 is formed in the bottom 119 of the container body 110. The concave portion 116 has a shape in which the convex portion 122 formed on the upper portion of the lid portion 120 is fitted. The concave portion 116 of the container body 110 and the convex portion 122 of the lid portion 120 are fitted into each other when the plurality of containers 100 are stacked so that the stacked container 100 is hard to slip off .

The lid portion 120 is formed with a female screw 121 corresponding to the male screw 115 on its inner peripheral surface. And the packing 130 is mounted on the inner side.

The material of the packing 130 may be, for example, a rubber-based material or a resin-based material. When the dimension precision of the opening portion 117 of the neck portion 112 of the container main body 110, particularly the dimension accuracy of the end portion 118 of the opening portion 117 is low or the partition line is formed, Confidentiality is not maintained. However, since the container 100 of the present embodiment is formed by using the injection molding die 200 described below, the dimensional accuracy of the opening 117 of the neck portion 112 is high, The partition line is not formed at the end portion 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the cap 130 and the lid portion 120 so that the airtightness can be improved.

As shown in Fig. 12, on the outer circumferential surface of the trunk section 111 of the container 100, a label 150 describing a product name, a country of manufacture, a use method, and the like is integrally formed by in-mold label molding. In-mold molding is a widely used technique in injection molding or blow molding. Since the container 100 of the present embodiment forms the container body 110 using the injection molding die 200 described below, the label 150 can be integrally formed on the container body 110 by in- Can be molded. The label 150 is formed of a film such as OPP (polypropylene).

The label 150 is integrally formed on the container body 110 so that the secondary processing for the exterior decoration of the container body 110 is unnecessary such as printing or hot stamping and the container 100 is manufactured at low cost can do.

1 and 2, the outer peripheral surface of the body 111 of the container body 110 is slightly inclined from the bottom 119 side toward the shoulder 113 side It is a curved surface that has been enlarged and slightly swollen outward. 12 (A), the shape of the label 150 is not a simple rectangle but a shape along the outer peripheral surface of the container body 110. [ 12A is a view showing the position of the label 150 in the height direction of the container main body 110. Fig. The label 150 is integrally molded in a state in which the outer peripheral surface of the container main body 110 is wound so as to be substantially in a circumferential direction as shown in Fig. 12 (A) to Fig. 12 (B). 12A, the shape of the label 150 is concretely a shape in which the first long side 151 and the second long side 152 of the label 150 are connected to the neck portion of the container body 110 112). 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. 12 (B), the first long side 151 and the second long side 152 of the label 150 are integrally formed on the outer peripheral surface of the container body 110, The first short side 153 and the second short side 154 are arranged substantially parallel to each other, and the appearance of the container 100 is improved.

In this embodiment, as shown in FIG. 12 (B), the first short side 153 and the second short side 154 of the label 150 are not overlapped with each other to form the gap 155, 155) can also be used as a part for visually observing the remaining amount of cosmetics. For example, the container body 110 is made of a highly transparent resin, and the label 150 is made a colored film so that the light transmittance is low. Since the gap 150 between the first short side 153 and the second short side 154 of the label 150 becomes a window portion having translucency by integrally forming the label 150 on the container body 110, 155) is added to the remaining amount of cosmetics.

Next, the injection mold 200 for injection molding the container 100 will be described. Hereinafter, as shown in Figs. 3 to 11, the side on which the stationary mold 10 is arranged is referred to as downward, and the side on which the outer mold 40 on the main body, which is a movable mold, is disposed is referred to as the upper side. The direction in which the first slide core (50) slides is referred to as a left and right direction, and the direction in which the second slide core (60) slides as a forward and backward direction. On the other hand, the shape of the injection-molding mold 200 is not limited to the embodiment described below.

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

In the following description, " mold releasing " means a state in which the molding surface of the mold is separated from the molded body. In addition, " mold drawing " means a state in which the mold is removed by passing the mold through an undercut of the molding.

3 to 5 show a state in which the mold 200 for injection molding is closed. The injection molding die 200 mainly includes a fixed mold 10, a first slide plate 20, a second slide plate 30, an outer mold 40 of the main body, a first slide core 50, A core block 70, a neck outer mold 80, and a neck inner mold 90. As shown in Fig.

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 injection mold 200 will be described briefly. The pair of first slide cores 50, the pair of second slide cores 60, and the core block 70 pass through the neck inner mold 90. The neck portion inner mold 90 has a first molding surface 91 for molding the end portion 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the container body 110. The first slide core 50 has a second molding surface 51 for molding a part of the inner peripheral surface of the body 111 of the container body 110 and a part of the inner surface of the bottom 119 of the container body 110 And a sixth shaping surface 54 for molding. The second slide core 60 has a third molding surface 61 for forming a part of the inner circumferential surface of the trunk section 111 of the container body 110 and a part of the inner surface of the bottom section 119 of the container body 110 And a seventh molding surface 63 for molding. The main body outer mold 40 has a fourth molding surface 41 for molding the outer peripheral surface of the container main body 110. The core block 70 has a fifth shaping surface 74 for forming a part of the inner surface of the bottom portion 119 of the container body 110.

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

Next, the configuration of the injection mold 200 will be described in detail. The stationary mold 10 has a portion having a substantially concave cross-sectional shape. The second slide plate 30 and the core block 70 are disposed in the substantially concave portion. A first slide plate (20) is disposed above the stationary mold (10). When the first slide plate 20 is shifted from the mold closed state (see FIGS. 3 and 4) to the mold opening state (see FIGS. 8 to 11), the first slide plate 20 is moved upward relative to the stationary mold 10 In the direction of the arrow. The first slide plate 20 supports the neck inner mold 90 and the pair of first slide cores 50.

The neck portion inner mold 90 is fixed to the first slide plate 20. The neck portion inner mold 90 has a first molding surface 91. The first shaping surface 91 forms the end 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the container body 110. The first shaping surface 91 is continuous in the circumferential direction of the inner circumferential surface of the neck portion 112. &Quot; Continuous in the circumferential direction " means that the first molding surface 91 is formed of a continuous continuous mold, and no partition line is formed. This improves dimensional accuracy of the end portion 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the container body 110 as a molding and prevents formation of a partition line.

The first slide core (50) has a second molding surface (51) and a sixth molding surface (54). The second shaping surface 51 forms a part of the circumferential direction of the inner circumferential surface of the body portion 111 of the container body 110 and a portion of the circumferential direction of the undercut 114 continuous to the inner circumferential surface of the neck portion 112 . The sixth molding surface 54 forms a portion of the inner surface of the bottom portion 119 of the container main body 110 facing the fifth molding surface 74 of the core block 70, .

The first slide core (50) has a first support portion (52). The first support portion (52) penetrates the inside of the neck portion inner mold (90). The end portion of the first support portion 52 is located at a position where the first slide core 50 is in the radial direction of the first molding surface 91 of the neck inner mold 90, And is inserted between the first slide plate 20 and the neck inner side mold 90 so as to be slidable in the radial direction of the neck.

The first slide core 50 has a third slide surface 55 in contact with the first slide surface 71 of the core block 70 and a fourth slide surface 56 in contact with the second slide core 60 . The first slide core 50 is moved upward relative to the core block 70 when the first slide core 50 is moved from the mold closed state (see FIGS. 3 to 5) to the mold opening state (see FIGS. 8 and 9) The first slide surface 71 and the second slide core 60 of the core block 70 can move inward in the radial direction of the neck inner mold 90. [

The neck outer mold 80 is disposed above the neck inner mold 90. The neck outer mold 80 forms the outer peripheral surface of the neck portion 112 of the container body 110 and the male screw 115. When the mold opening is performed, the neck outer mold 80 moves in the forward and backward directions as shown in Figs. 4 and 7. After the mold opening of the neck outer mold 80 is performed, the illustration of the neck outer mold 80 in Figs. 6, 8, and 10 is omitted.

When the second slide plate 30 is moved from the mold closed state (see FIGS. 3 and 4) to the mold opening state (see FIGS. 8 to 11), the second slide plate 30 is moved upward In the direction of the arrow. The second slide plate (30) supports the 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 shaping surface 61 forms part of the circumferential direction of the undercut 114 continuous to the circumferential direction of the inner circumferential surface of the trunk section 111 of the container main body 110 and the inner circumferential surface of the neck section 112 . The seventh forming surface 63 is formed on the inner surface of the bottom portion 119 of the container main body 110 by a portion formed by the fifth forming surface 74 of the core block 70, A portion other than the portion formed by the sixth molding surface 54 is formed.

The second slide core (60) has a second support portion (62). The second support portion 62 is passed through a hole 92 formed obliquely to the neck inner side mold 90. The second support portion 62 is movable 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 or in the diameter direction of the neck portion 112 of the container body 110, And is supported by the second slide plate 30.

The second slide core 60 has a second slide surface 72 of the core block 70 and a fifth slide surface 64 abutting the first slide core 50. When the second slide core 60 moves from the mold closed state (see FIGS. 3 to 5) to the mold opening state (see FIGS. 10 and 11), the second slide plate 30 is moved to the neck inner mold 90) and the core block 70 in the radial direction of the neck inner side mold 90 along the hole 92 of the neck inner side mold 90 by moving in the upward (first direction) relative to the core block 70 And is configured to be movable. At this time, the second slide core 60 contacts the first slide core 50 and is relatively moved upward relative to the first slide core 50, the core block 70, and the neck inner mold 90 In the first direction).

The core block 70 is fixed inside the stationary 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. [ The fifth molding surface 74, the first slide surface 71, and the second slide surface 72 are formed on the upper portion of the core block 70.

The fifth shaping surface 74 is substantially rectangular and forms a central portion of the inner surface of the bottom portion 119 of the container main body 110. The first slide surface 71 is opposed to the pair of first slide cores 50 and abuts against the first slide core 50. The second slide surface (72) faces the pair of second slide cores (60) and contacts the second slide core (60). On the first slide surface 71, a projection 73 having a T-shaped cross section is formed. The projections 73 engage with grooves 53 having a T-shaped cross section formed in the first slide core 50. The first slide core 50 is moved along the first slide surface 71 of the core block 70 radially inward of the neck inner mold 90 by the engagement of the groove 53 with the projection 73 It is movable.

On the upper side of the first slide plate 20, an outer mold 40 is disposed. The main body outer mold 40 has a fourth molding surface 41. The fourth shaping surface 41 forms the outer peripheral surface of the body 111 of the container body 110. The outer mold 40 is provided with a sprue runner 42 for injecting the molten synthetic resin into the cavity C. The outer mold 40 of the main body 40 is provided with a plurality of suction holes (not shown) for suction on the fourth molding surface 41 so as to suck the label on the fourth molding surface 41 have.

Next, the operation of the injection molding with the injection molding die 200 will be described. Figs. 3 and 4 show a state in which the cavity C is formed by mold-closing the mold 200 for injection molding. The cavity C includes a body outer mold 40, a first slide core 50, a second slide core 60, a core block 70, a neck outer mold 80 and a neck inner mold 90, . In the case of performing in-mold molding, a label is wound around the first slide core 50 and the second slide core 60 before the mold closing is performed. After the mold 200 for injection molding is closed, the label is adsorbed on the fourth molding surface 41 by suction holes (not shown) for adsorption formed on the mold 40 outside the main body. In this state, the melted synthetic resin is injected into the cavity C from the sprue- After the synthetic resin is injected into the cavity C, the container main body 110, which is a molding, moves from the state of being cooled and solidified to the mold opening step.

Next, the mold opening process of the injection molding die 200 will be described. First, as shown in Figs. 6 and 7, the outer mold 40 of the main body moves upward, and the neck outer mold 80 moves in the front-rear direction. Thus, the outer mold 40 of the main body is released from the outer peripheral surface of the body 111 of the container body 110 as a molding. Further, the neck outer mold 80 is released from the outer peripheral surface of the neck portion 112 of the container body 110 as a molding.

Subsequently, as shown in Figs. 8 and 9, the first slide plate 20 and the second slide plate 30 move relative to the fixed mold 10 in the upward direction (first direction). The pair of first slide cores 50 can be moved upward relative to the core block 70 with the neck inner mold 90 because the core block 70 is fixed to the stationary mold 10 1). The first slide core 50 moves along the first slide surface 71 of the core block 70 when the neck portion inner mold 90 In the radial direction. The second molding surface 51 of the first slide core 50 is formed so as to extend from the first molding surface 91 of the neck inner side mold 90 to the inner side in the radial direction of the neck portion 112 of the container body 110 And moves inward in the radial direction from the inner peripheral surface of the neck portion 112 formed by the first forming surface 91 of the neck portion inner mold 90. At this time, the first slide core (50) moves while contacting the fourth slide surface (56) with the second slide core (60).

The second molding surface 51 of the first slide core 50 is released from the inner peripheral surface of the body 111 of the container body 110 and the undercut 114 as a molding. In this state, the first slide core 50 is allowed to pass through the opening 117 of the neck portion 112 of the container body 110, which is a molding, and can be drawn out.

Subsequently, as shown in Figs. 10 and 11, the second slide plate 30 relatively moves upward (first direction) with respect to the fixed mold 10 and the first slide plate 20 do. The second slide core 60 moves relatively upward (in the first direction) relative to the neck inner mold 90, the first slide core 50, and the core block 70, The second support portion 62 of the slide core 60 moves in the axial direction of the second support portion 62 with respect to the neck inner side mold 90. [ The third shaping surface 61 of the second slide core 60 is located on the inner side in the radial direction of the neck portion 112 of the container main body 110 than the first shaping surface 91 of the neck inner mold 90 And moves inward in the radial direction from the inner peripheral surface of the neck portion 112 formed by the first forming surface 91 of the neck portion inner mold 90. At this time, the second slide core 60 moves while touching the fifth slide surface 64 to the first slide core 50.

The second slide core 60 is released from the inner peripheral surface of the body 111 of the container body 110 as a molding and the undercut 114. [ In this state, the second slide core 60 passes through the opening 117 of the neck portion 112 of the container body 110, which is a molding, and can be drawn out.

The second slide core 60 is relatively moved upward relative to the first slide core 50, the core block 70, and the neck inner mold 90 when the slide core 60 is released from the container body 110, (First direction), the container body 110 as a molding is pulled out as it is projected by the second slide core 60. That is, the container body 110, which is a molding, can be pulled out from the first slide core 50, the core block 70, and the neck inner mold 90 without providing a separate projection means. Thereafter, the container body 110 as a molding is pulled out of the second slide core 60 by a take-out device (not shown), and the mold opening process of the injection-molding mold 200 is completed.

The container 100 made of the above injection molding die 200 has an inner surface of the bottom portion 119 of the container main body 110, an inner peripheral surface of the main body portion 111 of the container main body 110, A plurality of partition lines are formed in the undercut 114 continuing from the inner circumferential surface of the body portion 111 of the body 110 to the inner circumferential surface of the neck portion 112 by the molding surface of the plurality of injection molding metal molds 200 . On the other hand, no partition line is formed at the end portion 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the container main body 110.

The core block 70 and the first partition line PL1 formed by the first slide core 50 and the core block 70 are formed on the inner surface of the bottom portion 119 of the container main body 110. [ A second partition line PL2 formed by the second slide core 60 and a third partition line PL3 formed by the first slide core 50 and the second slide core 60 are formed. The undercut 114 continuing to the inner circumferential surface of the trunk section 111 of the container body 110 and the inner circumferential surface of the neck section 112 is provided with the first slide core 50 and the fourth slide core 60 A partition line PL4 is formed. The end portion 118 of the opening 117 from the inner peripheral surface of the neck portion 112 of the container main body 110 is formed by the first molding surface 91 of the neck inner side mold 90 so that the partition line is not formed Do not.

According to the container 100, the injection molding die 200, and the injection molding method according to the present embodiment described above, the following effects are obtained.

The end portion 118 of the opening 117 from the inner circumferential surface of the neck portion 112 of the container main body 110 is formed by the neck inner mold 90 having the first molding surface 91 continuing in the circumferential direction Therefore, the end portion 118 of the opening 117 can be molded with high precision from the inner peripheral surface of the neck portion 112. Since the partition line is not formed at the end portion 118 of the opening portion 117, the packing 130 can be uniformly contacted, and the airtightness can be enhanced.

The undercut 114 continuous to the inner circumferential surface of the body 111 of the container main body 110 and the inner circumferential surface of the neck portion 112 is formed into the first slide core 50 and the second slide core 60. Since the first slide core 50 and the second slide core 60 are pulled out in a state in which they are moved inward than the neck portion inner mold 90, The end portion 118 of the opening 117 can be molded with high accuracy from the inner circumferential surface of the neck portion 112 because the opening portion 117 of the neck portion 112 is not deformed.

The pair of first slide cores 50 are arranged such that the second molding surface 51 is positioned in the radial direction of the neck portion 112 of the container main body 110 with respect to the first molding surface 91 of the neck inner mold 90 The pair of second slide cores 60 move while contacting the pair of second slide cores 60 while moving the fourth slide faces 56 toward the inside of the pair of second slide cores 60, When the fifth slide surface 64 is moved in the diametrical direction of the neck portion 112 of the container main body 110 from the first molding surface 91 of the neck portion inner mold 90, And moves while contacting the core (50). This movement makes it possible to make the first slide core 50, the second slide core 60 and the core block 70 compact in the mold opening process. Therefore, even if the depth of the undercut 114 is deepened, Drawing can be performed.

As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications are possible.

100 ... Vessel
200 ... Mold for injection molding
10 ... Fixed mold
20 ... The first slide plate
30 ... The second slide plate
40 ... Outside mold
41 ... The fourth molded surface
42 ... The sprue-
50 ... The first slide core
51 ... The second shaping surface
52 ... The first support portion
53 ... home
54 ... Sixth molding surface
55 ... The third slide surface
56 ... Fourth slide surface
60 ... The second slide core
61 ... The third shaping surface
62 ... The second support
63 ... Seventh molding surface
64 ... The fifth slide surface
70 ... Core block
71 ... The first slide surface
72 ... The second slide surface
73 ... spin
74 ... The fifth shaping surface
80 ... Neck Outer Mold
90 ... Neck part inner mold
91 ... The first shaping surface
92 ... hall
C ... Cavity
110 ... The container body
111 ... Body part
112 ... Neck part
113 ... Shoulder portion
114 ... Undercut
115 ... Male thread
116 ... Concave portion
117 ... Opening
118 ... End
119 ... Bottom portion
120 ... Lid portion
121 ... female screw
122 ... Convex portion
130 ... packing
150 ... label
151 ... 1st long side
152 ... Second long side
153 ... First short side
154 ... Second short side
155 ... aperture
PL1 ... The first partition line
PL2 ... The second partition line
PL3 ... The third partition line
PL4 ... Fourth partition line

Claims (9)

1. A mold for injection molding of a container having an undercut on the inner side of a container body,
A neck inner mold having a first molding surface continuous in the circumferential direction for molding the end portion of the opening portion from the inner peripheral surface of the neck portion of the container body,
A portion of the circumferential direction of the inner circumferential surface of the body portion of the container body and a portion of the circumferential direction of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion are passed through the neck portion inner mold, A pair of first slide cores having a second shaping surface,
A portion of the circumferential direction of the inner circumferential surface of the body portion of the container body and a portion of the circumferential direction of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion are passed through the neck portion inner mold, A pair of second slide cores having a third shaping surface,
And a core block penetrating the inside of the neck portion and disposed in a region surrounded by the pair of first slide cores and the pair of second slide cores,
The pair of first slide cores moves in a first direction relative to the core block together with the neck inner side mold so that the second molding surface is positioned above the first molding surface of the neck portion inner mold Moves inward in the radial direction of the neck portion of the container body,
Subsequently, the pair of second slide cores move further in the first direction relative to the neck inner mold, the first slide core, and the core block, Wherein the neck portion inner mold moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck portion inner mold. The method according to claim 1,
Wherein the first slide core has a first support portion passing through the inner mold of the neck portion and the second slide core has a second support portion penetrating the neck portion inner mold,
A stationary mold to which the core block is fixed,
Wherein the neck portion inner mold is movable in the first direction with respect to the fixed mold and supports the inner mold of the neck portion and the first support portion of the pair of first slide cores A first slide plate slidably supporting the neck portion of the container body in the radial direction,
A second slide which is movable in the first direction with respect to the fixed mold and the core block and which supports the second support portion of the pair of second slide cores so as to be slidable in the radial direction of the neck portion of the container main body; Further comprising a plate,
The first slide plate and the second slide plate are moved in the first direction with respect to the fixed mold so that the pair of first slide cores and the neck portion inner mold are moved relative to the core block The first support portions of the pair of first slide cores move inward in the radial direction of the neck portion of the container body with respect to the neck portion inner mold, The second molding surface of the first slide core moves inward in the radial direction of the neck portion of the container main 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, and the pair of second slide cores is moved in the first direction along the neck inner mold, The slide core, and the core block, and the second support portion of the pair of second slide cores is moved in the first direction relative to the neck core inner mold with respect to the axis of the second support portion , And the third molding surface of the pair of second slide cores moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck portion inner mold Mold for injection molding. 3. The method of claim 2,
The core block includes a substantially rectangular fifth shaping surface for forming a central portion of the inner surface of the bottom portion of the container body, a first slide surface in contact with the first slide core, a second slide in contact with the second slide core Take more cotton,
The pair of first slide cores includes a sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface with a portion to be formed therebetween, A third slide surface contacting one slide surface and a fourth slide surface contacting the second slide core,
Wherein the pair of second slide cores has a third molding surface for molding a portion of the inner surface of the bottom portion of the container body that is formed by the fifth molding surface and a portion other than the portion formed by the sixth molding surface, And a fifth slide surface contacting the second slide surface of the core block and the first slide core,
When the pair of first slide cores moves so that the second molding surface is inward in the radial direction of the neck portion of the container main body from the first molding surface of the neck portion inner mold, And is moved in contact with the second slide core of the second slide core,
Wherein the pair of second slide cores are configured such that when the third molding surface moves inward in the radial direction of the neck portion of the container body from the first molding surface of the neck inner mold, Is moved in contact with the first slide core of the mold. 1. A container having an undercut on the inside of a container body,
The inner surface of the bottom portion of the container body, the inner circumferential surface of the body portion of the container body, and the undercuts continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion are provided with a plurality of Having a partition line,
Wherein the partition line includes a pair of first slide cores, a pair of second slide cores, a pair of first slide cores, and a core block disposed in an area surrounded by the pair of second slide cores Respectively,
Wherein no partition line is provided at the end of the opening from the inner circumferential surface of the neck portion of the container main body. An undercut is provided on the inner side of the container body,
A plurality of partition lines formed by molding surfaces of a plurality of divided injection molding dies on the inner surface of the bottom portion of the container main body,
As a container which does not have a partition line at the end of the opening from the inner circumferential surface of the neck portion of the container body,
The injection molding die for molding the container body comprises:
A substantially rectangular fifth molding surface for molding a central portion of the inner surface of the bottom portion of the container main body,
A sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface,
And a seventh molding surface for molding a portion of the inner surface of the bottom portion of the container main body other than the portion formed by the fifth molding surface and the portion formed by the sixth molding surface,
The partition line on the inner surface of the bottom portion 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, And a third partition line by the sixth molding surface and the seventh molding surface. An undercut is provided on the inner side of the container body,
The inner surface of the bottom portion of the container body, the inner circumferential surface of the body portion of the container body, and the undercuts continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion are provided with a plurality of Having a partition line,
As a container which does not have a partition line at the end of the opening from the inner circumferential surface of the neck portion of the container body,
The injection molding die for molding the container body comprises:
A neck inner mold having a first molding surface continuous in the circumferential direction for forming an end portion of the opening portion from the inner circumferential surface of the neck portion of the container main body,
A core block having a substantially rectangular fifth shaping surface for forming a central portion of the inner surface of the bottom portion of the container main body;
A sixth molding surface for molding a portion of the inner surface of the bottom portion of the container main body opposite to the fifth molding surface through a portion to be molded therebetween; A pair of first slide cores having a second molding surface for forming a part of the undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion,
A seventh molding surface for molding a portion of the inner surface of the bottom portion of the container main body other than a portion formed by the fifth shaping surface and a portion formed by the sixth shaping surface; A pair of second slide cores each having a third molding surface for forming a part of an undercut continuous from the inner circumferential surface of the body portion of the container body to the inner circumferential surface of the neck portion, And,
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, and a second partition line formed by the first slide core and the second slide core, Having a third partition line by a second slide core,
Wherein an inner circumferential surface of the body portion of the container main body and an undercut continuous to the inner circumferential surface of the neck portion have a fourth partition line formed by the first slide core and the second slide core. A container characterized in that it is molded using a mold for injection molding of the container according to any one of claims 1 to 3. A method of injection molding a container using a mold for injection molding of the container according to any one of claims 1 to 3,
The injection molding die further includes an outer body mold having a fourth molding surface for molding an outer peripheral surface of the body portion of the container body,
And a step of disposing 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 the synthetic resin is injected into the cavity . 8. A container according to any one of claims 4 to 7,
Wherein a label that substantially extends around an outer circumferential surface of the body portion of the container main body is molded by injection molding,
Both ends of the label are not overlapped with each other, and the portion is made to be a portion which is the remaining amount of the contents.

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