JP5340704B2 - container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container having a smoother hole section and a method for manufacturing the same. <P>SOLUTION: The method for manufacturing the container includes a perforated container body and a cover capable of covering a hole of the container body by arranging a core 21, a cavity 22, and a slide core 23 at intervals to fill the gap with a resin. The method for manufacturing the container comprises the step of forming part of the container body by filling the gap between the core 21 and the cavity 22 with the resin, at the same time, of forming the hole on part of the container body by bringing the part of the core 21 in contact with the part of the cavity 22, of forming the cover by filling the gap between the cavity 22 and the slide core 23 with the resin, and of forming part of the remainder of the container body by filling with the resin the gap between the slide core 23 and the core 21. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention generally relates to a container and a method for manufacturing the same, and more particularly to a method for manufacturing a container by filling a mold with a resin and a container manufactured thereby.

  Paper is generally used for containers such as confectionery, but containers made of resin have higher sealing properties, are stronger than paper, and can be easily molded into various shapes. In recent years, many confectionery containers using such containers have been used.

  As an example using a container made of resin, for example, as shown in FIG. 8, a lower container 91 made of paper for storing confectionery and the like, and an upper side made of resin fitted into the lower container 91 There is a combination with the container 92. The upper container 92 has a hole 9211 formed in the container body 921 for taking out the confectionery stored in the lower container, and a lid 922 that can close the hole 9211 has a hinge portion. It is molded integrally with the container main body 921 via 923. The lid portion 922 has a bent portion 9221, and the entire lid portion can be bent via a hinge portion 923. A consumer who has purchased this product opens the lid portion 922 when necessary. After the desired amount of confectionery is taken out and the desired amount is taken out, the lid 922 can be closed and stored so as not to spill the confectionery in the container.

  The container is very useful. However, in the conventional process for manufacturing this container, there is a problem that burrs remain on the inner portion of the hole 9211 for taking out the confectionery and on the upper surface portion. This burr has a problem that the touch is not good.

  The upper container (hereinafter simply referred to as “container”) includes the container main body 921 and the lid 922 as described above, and the container main body 921 and the lid 922 are interposed via the hinge 923. It is molded integrally. Therefore, in the known manufacturing method, a container 92 as shown in FIG. 8 is obtained by using a mold in which a gap having substantially the same shape as that of the container 92 is formed and filling the mold with a molten resin. be able to. Here, an outline of a conventional method for manufacturing the upper container (hereinafter also referred to as “known manufacturing method”) will be described with reference to FIGS. FIG. 9 is a diagram showing a mold used for manufacturing a container, and FIG. 10 is a partial enlarged view of a part of FIG. 9 (near the part surrounded by a dotted circle in the figure).

  Specifically, the mold shown in FIGS. 9 and 10 has a core formed with a surface 811 corresponding to the inner surface of the container 92 and a hole forming portion 812 corresponding to a hole for taking out confectionery or the like. 81, a cavity 82 that faces the core 81 and is disposed with a gap, and a side that is substantially parallel to the surface 811 of the core 81 and on which the hole forming portion 812 of the core 81 is formed ( 9 is referred to as an arrow in FIG. 9 and is also referred to as “lid inner surface side” because it is inside the lid. By doing so, a container with a lid 922 in which a bent portion 9221 is formed can be formed.

  However, as shown in FIGS. 9 and 10, the slide core 83 needs to be inserted from the inner surface side of the lid due to the presence of the bent portion 9221 of the lid, filled with resin, cooled, and then pulled out. It is necessary to flatten the lower surface 831 of the core 83 and provide all the irregularities for forming holes in the core 81. In addition, in general, the core 81 and the slide core 83 cannot be firmly adhered to each other in order to prevent wear due to contact with the mold, resulting in a gap 813 of about 0.01 to 0.02 mm. When the resin is filled, a small amount of resin enters the gap, which remains as burrs, and causes the above-described problems. In particular, according to this method, since the cross section of the hole 9211 has a right-angled portion on the upper surface and the burr 9212 is generated at that portion, the burr 9212 has a great adverse effect. FIG. 11 shows a partial cross-sectional view in the vicinity of the hole of the container in this case.

  Then, an object of this invention is to provide the container which has a smoother hole cross section, and its manufacturing method in view of the said subject.

  The inventors of the present invention have been diligently studying the above-mentioned problems. As a result, the position of the lid is adjusted and the slide core is on the side opposite to the inner surface of the lid (hereinafter referred to as the outer surface of the lid). It has been found that it is possible to form a smoother hole cross-section by making it possible to insert from the lid outer surface side "), and the present invention has been completed.

  That is, in the container manufacturing method according to one means of the present invention, the core, the cavity, and the slide core are arranged with a gap, and the gap is filled with resin, so that the container main body having a hole, the container A method of manufacturing a container having a lid that covers a hole in a main body, wherein a part of the container main body is formed by filling a gap between the core and the cavity, and a combination of the core and the cavity A hole is formed in a part of the container body correspondingly, a lid is formed by filling a resin between the cavity and the slide core, and a container is filled by filling the resin between the slide core and the core. The remaining part of the main body is formed.

  Further, a container according to another means of the present invention is a container having a container main body part in which a hole is formed and a lid part connected to the container main body part via a hinge part, the container main body part The inner cross section of the hole is characterized in that the upper and lower ends of the inner peripheral surface are curved surfaces having no corners.

  As described above, according to the present invention, it is possible to insert the slide core from the lid outer surface side while making the container having a lid, and it is possible to provide a container having a smooth hole cross section and a method for manufacturing the same.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention can be implemented in many different forms, and is limited only to the descriptions of the following embodiments and the drawings themselves. It is not something.

  FIG. 1 is a schematic perspective view of a container 1 manufactured by the manufacturing method according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA ′ in FIG. 1 (however, the lid portion 13 is folded to the outer surface side). State diagram).

  As shown in FIGS. 1 and 2, the container 1 according to the present embodiment includes a container main body part 11 in which a hole 111 is formed, and a lid part 13 connected to the container main body part 11 via a hinge part 12. , And is configured. The lid portion 13 can be folded via the hinge portion 12, and the lid portion 13 can cover the hole 111 of the container main body portion 11 in a folded state. Further, a rib 131 is formed on the inner surface of the lid portion 13, and the state of covering the hole 111 can be stably maintained by being hooked on the inner peripheral surface of the hole 111. Moreover, the front-end | tip of the cover part 13 forms the bending part 132, for example, as shown in FIG. 1, and has improved the sealing performance of the hole 111 in a container main-body part.

  Here, a method for manufacturing a container according to the present embodiment (hereinafter referred to as “the present manufacturing method”) will be described in detail. FIG. 3 is a cross-sectional view when the molds 2 used in the present manufacturing method are combined, and FIG. 4 is a partial enlarged view of FIG. 3 (a part indicated by a dotted line in the figure). This cross-sectional view is a cross-sectional view taken along the same plane as the A-A ′ cross-sectional view in FIG. 2.

  The mold 2 used in the present embodiment is configured by combining a core 21, a cavity 22, and a slide core 23. The core 21, the cavity 22, and the slide core 23 are provided with a narrow gap. A container can be manufactured by placing and filling the gap with resin.

  The core 21 is used for forming the inner surface of the manufactured container, and is a main member in the mold. Moreover, since the hole 111 is formed in the container main body part 11 of the container 1 manufactured according to the present embodiment, the core 21 is formed with the hole forming part 211 protruding corresponding to the hole 111. . In the present embodiment, the core 21 is provided with a cooling means 212 for cooling the resin filled when forming the container. Further, the core 21 according to the present embodiment is connected to moving means (not shown) and is movable relative to the cavity 22 (see, for example, the arrow direction in FIG. 3).

  The cavity 22 according to the present embodiment is combined with the core 21 with a gap. When the gap between the core 21 and the cavity 22 is filled with resin, the resin becomes a part of the container main body 11 of the container 1. The cavity 22 is formed with a hole forming portion 221 having the same shape as the hole forming portion 211 in the core 21. When the core 21 and the cavity 22 are combined, these hole forming portions 211 and 221 It is in close contact. As a result, this portion becomes the hole 111 in the container main body 11. The cavity 22 according to the present embodiment is formed with a hot runner 222 and a cooling means 212 for supplying resin to the gap. Here, a partial cross-sectional view in the vicinity of the hole in the container 1 manufactured using this mold is shown in FIG. 5, and a partial cross-sectional view in the vicinity of the hinge portion 12 is shown in FIG.

  The slide core 23 according to the present embodiment is one of mold members necessary for forming the container 1 in combination with the core 21 and the cavity 22, and is connected to a moving means (not shown), 22 is relatively movable. However, in the present embodiment, the slide core 23 can move in a direction substantially perpendicular to the moving direction of the core 21 with respect to the cavity 22 (the direction in which the core 21 and the cavity 22 are combined). It is substantially parallel to the upper surface 2111 of the hole forming portion 211 or the surface 213 corresponding to the inner surface of the container main body portion, and is configured to be inserted from the lid outer surface side instead of the lid inner surface side (for example, the arrow in FIG. 3) Direction). As a result, as shown in FIG. 3, the lid portion can be formed by filling the gap between the cavity 22 and the slide core 23 with resin, and the gap between the slide core 23 and the core 21 can be filled with resin. The remaining part of the container body 11 can be formed. In the present embodiment, the formed lid 13 is formed in a state substantially parallel to the upper surface of the container body 11.

  Here, the effect of the manufacturing method of the container which concerns on this embodiment is demonstrated anew. First, in the above-described known manufacturing method, as shown in FIG. 9, since the lid portion is formed in a state of being substantially perpendicular to the surface of the container main body portion, the tip of the lid portion is bent. Due to the construction, the cavity cannot be arranged on the side where the hole is formed, and the slide core can be arranged only substantially parallel to the upper surface of the hole forming portion and inserted and pulled out from the inner surface side. As a result, the lower surface of the slide core (the surface on the core side) needs to be flattened, and the bottom surface of the slide core can hardly be provided with unevenness, and the lower side is required to form a hole in the container body. The core had to be formed with all the irregularities. As a result, as shown in the enlarged view of FIG. 11, the upper cross-section of the hole was almost perpendicular and burrs remained.

  Furthermore, according to a known manufacturing method, the slide core has become large because it is necessary to stand the lid in a direction substantially perpendicular to the upper surface of the container body. As a result, a sufficient volume for providing a runner for filling the cavity with resin and a cooling mechanism for cooling the resin could not be secured. As a result, there is a problem that a cold runner has to be adopted, and it takes time to fill and cool the resin, so that the production efficiency cannot be sufficiently increased and the cost is increased.

  In addition, according to a known manufacturing method, the inner surface of the lid is formed by a slide core, and therefore, when an object having a complicated structure, such as a rib with a barb, is provided inside the lid, it moves. Since a complicated mechanism such as providing a movable pin on the slide core is required, the design of the configuration becomes extremely difficult. Therefore, it is not necessary to form ribs to tightly seal the container. Further improvements such as providing a projection for hooking the lid on the side of the part were added, or a compromise was found in the sealing performance of the container.

  On the other hand, according to the container manufacturing method according to the present embodiment, the slide core can be inserted and pulled out from the lid outer surface side by adopting a configuration in which the lid portion is tilted to the lid outer surface side. The position where the hole is formed can be set on the inner surface side of the lid, that is, between the core and the cavity, and irregularities (hole forming portions) for forming the holes can be provided in the core and the cavity, respectively. As a result, for example, as shown in the partial cross-sectional view of FIG. 4, the upper and lower ends of the inner peripheral surface of the hole can be curved with no corners. Particularly in this case, since a hole is formed between the core and the cavity, it is possible to strongly adhere the hole forming portions of the core and the cavity, and the generation of so-called burrs can be suppressed very little. In addition, if burrs are generated due to the resin entering, even if a step is generated due to the displacement of the hole forming portion, it is formed at the right angle portion at the upper end of the inner peripheral surface of the hole as shown in FIG. Therefore, it is possible to remarkably reduce the deterioration of the touch due to burrs (stimulation on the fingers) and the possibility of being caught by consumers' hands. In the present embodiment, when the angle between the upper surface of the container main body and the inner side surface (that is, the closed state) of the lid is 0 degree, the lid 13 is greater than 90 degrees and 180 degrees or less. It is necessary to be 120 degrees or more and 180 degrees or less, more preferably 150 degrees or more and 180 degrees or less, and further preferably about 180 degrees. Further, as shown in the present embodiment, since the bent portion 132 is formed at the tip of the lid portion 13, in addition to the above, the angle formed by the upper surface of the container main body portion and the surface of the bent portion 132 is 90 degrees. It is preferable to make it above. By doing in this way, a container can be manufactured efficiently, without becoming reverse taper. The same applies to the side surface 1311 of the rib 131. In particular, if the side surface 1311 of the rib 131 is tapered so as to have a trapezoidal shape, it becomes reversely tapered even when the lid portion 13 is less than 180 degrees. This is useful in that it can be prevented.

  In addition, according to the container manufacturing method according to the present embodiment, since the lid portion is inclined to the lid outer surface side, the slide core is thin and small, but the cavity can be made sufficiently large. A runner to be supplied and a cooling mechanism for cooling the resin can be easily arranged. As a result, even a hot runner that requires a heating device can be easily adopted, the manufacturing time can be shortened, that is, the manufacturing efficiency can be increased, and the unit price of the container can be significantly reduced. .

  Furthermore, according to the manufacturing method of the container which concerns on this embodiment, the lid inner surface of the cover part 13 can be formed in a cavity by tilting a cover part to a cover outer surface. Since the cavity in which the runner is formed can be fixed in position, for example, as shown in the schematic diagram of FIG. 7, it is only necessary to provide the pin 223 on the fixed cavity side, so that the movable slide There is no need to do complicated things such as providing a movable pin on the core, the structure can be kept as complex as possible, and the rib 131 with the protrusions on the lid portion 13 can be easily provided on the container. It is possible to cover the hole with the lid part properly and reliably. The formation of the rib 131 in this case will be described. (1) First, after filling the mold with resin, the pin 223 is moved with respect to the cavity 22, and the lid portion 13 of the container is separated from the cavity 22, while the pin 223 is provided with the protrusion 1312 of the rib 131. Leave on the side (outside). (2) Next, the pin 223 is pulled up to open the outside of the rib 131. Thereby, a cover part and a cavity can be isolate | separated completely. When the pin 223 is pulled up, the protrusion 1312 exists on the outer surface side of the rib 131, but the inner surface side of the rib 131 is open, so that the rib is bent by the elasticity of the resin and can be easily separated.

  As described above, according to the method for manufacturing a container according to the present embodiment, it is possible to insert the slide core from the side opposite to the side where the hole is formed while making the container having a lid. It can be manufactured and the manufacturing efficiency can be further improved.

  INDUSTRIAL APPLICABILITY The present invention has industrial applicability, for example, as a container for confectionery or the like and a method for producing the same.

It is a schematic perspective view of the container which concerns on embodiment. It is A-A 'sectional drawing in FIG. It is sectional drawing (sectional drawing corresponded to A-A 'of FIG. 1) of the metal mold | die which concerns on embodiment. FIG. 4 is a partial cross-sectional view of the mold according to the embodiment (near the dotted circle in FIG. 3). It is a fragmentary sectional view near the hole of the container concerning an embodiment. It is a fragmentary sectional view of the hinge part vicinity of the container which concerns on embodiment. It is a schematic fragmentary sectional view of the cover part and cavity in the case of forming the rib of the cover part of the container which concerns on embodiment. It is a schematic perspective view of a well-known container. It is sectional drawing of the metal mold | die for manufacturing a well-known container. FIG. 9 is an enlarged view of a part of the mold of FIG. 8 (in the vicinity of a round part indicated by a dotted line in the figure). It is a fragmentary sectional view near the hole of a well-known container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Container, 11 ... Container main-body part, 12 ... Hinge part, 13 ... Cover part, 21 ... Core, 22 ... Cavity, 23 ... Slide core, 81 ... Core, 82 ... Cavity, 83 ... Slide core, 91 ... Lower side Container, 92 ... upper container

Claims (3)

A core, a cavity, and a slide core are arranged with a gap between them, and by filling the gap with a resin, a container body having a hole and a lid capable of covering the hole in the container body A container having a portion, comprising:
Filling the gap between the core and the cavity with a resin forms a part of the container main body, and contacts the part of the core with a part of the cavity to form a part of the container main body. forming said hole,
A lid is formed by filling a resin in the gap between the cavity and the slide core,
Forming the remaining part of the container body by filling the resin in the gap between the slide core and the core ;
The lid portion is formed in a state where the angle between the upper surface of the container main body portion and the inner side surface of the lid portion is greater than 90 degrees and equal to or less than 180 degrees,
A protruding hole forming part for forming the hole is formed in the core,
The container manufacturing method , wherein a protruding hole forming part combined with the hole forming part of the core is also formed in the cavity . The direction substantially perpendicular to combine the said core cavity, the slide core is inserted and arranged, the manufacturing method of the container according to claim 1, wherein. A container body having a hole and a lid connected to the container body via a hinge,
The container manufactured by the container manufacturing method according to claim 1, wherein the inner cross section of the hole of the container main body portion has curved surfaces with no corners at the upper and lower ends of the inner peripheral surface.

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