KR20220009841A - Insert injection molding method and cup hold manufactured by the same that - Google Patents

Abstract

The present invention relates to an insert injection molding method in a new way of preventing an insert member from flowing or deforming in a process of molding an outer skin to make the insert member positioned in the correct position and reduce product defects thereby, and thus, manufacturing high-quality products at low cost; and a cup holder manufactured thereby.

Description

Insert injection molding method and cup holder manufactured thereby

The present invention relates to an insert injection molding method and a cup holder manufactured thereby, and more particularly, to a new type insert injection molding method in which an insert member is prevented from flowing or deformed during the shell molding process, and a cup holder manufactured thereby it's about

Insert injection is to insert an insert member into the injection mold and inject. Fixing it is very important.

To this end, the injection mold apparatus is provided with a fixing pin protruding into the cavity of the injection mold to fix the insert member. However, even in this case, the insert member may flow by the injection force of the resin, and furthermore, if the insert member is flexible or has the characteristic of being easily deformed by an external force, the insert member is deformed during the molding process, such as sagging. do.

For example, FIGS. 1 and 2 are a heating pad 100 used for medical purposes in which a planar heating element 120 is embedded with an insert member 120 inside the outer shell 110 made of a soft material. It is manufactured by inserting into and injection molding the shell 110 . In the case of manufacturing such a heating pad, when the insert member 120, that is, the planar heating element is fixed with the above-mentioned fixing pin, the part that cannot be fixed with the fixing pin of the planar heating element is sagged down, and the product flows when the resin is injected. defects are caused

Republic of Korea Patent Registration No. 10-0903558 (2009. 06. 11.) Republic of Korea Patent Publication No. 10-2009-0077368 (2009. 07. 15) Republic of Korea Patent Publication No. 10-2020-0010745 (2002. 01. 31)

The present invention has been proposed in view of the above points, and an object of the present invention is to prevent the insert member from flowing or deforming in the process of forming the outer skin, so that the insert member is positioned in the correct position, thereby reducing product defects. Accordingly, it is to provide a new type of insert injection molding method capable of easily manufacturing high-quality products at low cost, and a cup holder manufactured thereby.

According to a feature of the present invention, as an insert injection method for molding a product in which an insert member 120 is inserted inside the shell 110 , the runner is opened upward and downward and the shell molding agent forming the shell 110 is injected. (13,23) a primary molding process of forming the lower mold 10 and the upper mold 20 in which the cavities 12 and 22 are connected, respectively, with a plate-shaped intermediate mold 30 interposed therebetween; a shell molding agent injection process of injecting the shell molding agent into the cavities 22 and 12 of the upper and lower molds 20 and 10; The shell molding agent injected into the cavities 22 and 12 of the upper and lower molds 20 and 10 is hardened so that the viscosity and fluidity of the shell molding agent are not completely lost and some remain, so that the upper and lower molds are cured. a primary curing process of forming the semi-hardened upper half 112 and the semi-hardened lower half 114 of the outer skin in a less hardened state in the cavities 22 and 12 of (10, 20); an intermediate mold removal process of separating the upper and lower molds 20 and 10 and removing the intermediate mold 30; an insert member arrangement process of placing the insert member 120 on the semi-hardened outer half 114 of the less hardened state formed in the cavity 12 of the lower mold 10; a secondary molding process in which the upper mold 20 is molded on the lower mold 10 and the semi-hardened outer half 112 and the semi-hardened outer half 114 are integrally attached; a secondary curing process of additionally hardening the semi-hardened outer half 112 and the semi-hardened outer half 114 to completely lose viscosity and fluidity; and a demolding process of separating the upper and lower molds 20 and 10 and demolding the molded product.

According to another feature of the present invention, protrusions 32 protruding upward and downward are formed on the upper or lower surface of the intermediate mold 30, so that the semi-hardened outer skin upper half 112 and the semi-hardened outer skin lower half 114 are formed. Concave portions 116 and 118 recessed by the protrusion 32 are formed on the upper and lower surfaces, and the insert member 120 is disposed in the depressions 116 and 118 during the insert member arrangement process.

According to another feature of the present invention, the insert member 120 has a cross section curved to one side, and the cross section is made of a metal band that is deformed into a C shape by a repulsive force that is flattened by an external force. , the shell molding agent for forming the shell 110 is made of silicone rubber, and a cup holder is provided, characterized in that it is manufactured in the same manner as described above.

In the present invention having the above configuration, the insert member is prevented from flowing or deformed during the skin forming process, so that the insert member is positioned in the correct position. Therefore, by using the present invention, it is possible to reduce product defects caused by the insert member being dislodged from the original position or deformed, so that a high-quality product can be easily manufactured, thereby reducing the cost of the product.

1 and 2 are a perspective view and a longitudinal cross-sectional view of a known heating pad;
3 is an exploded perspective view of the injection mold used in the first embodiment of the present invention;
4 is a manufacturing process diagram of the embodiment;
5 is a perspective view of a cup holder manufactured according to a second embodiment of the present invention;
6 is a cross-sectional view of the embodiment;
7 is an exploded perspective view of the injection mold used in the above embodiment;
8 is a cross-sectional view of the injection mold in a coupled state;
9 is a perspective view of the use state of the embodiment;

Hereinafter, the present invention will be described in detail according to each embodiment.

Figure 3 is a perspective view showing the mold used in the first embodiment of the present invention, Figure 4 is a manufacturing process diagram according to this embodiment, this embodiment, as shown in Figures 1 and 2, the outer shell 110 inside It is applied to the manufacture of the heating pad 100 in which the planar heating element is inserted into the insert member 120 .

The manufacturing method according to this embodiment consists of the following processes using the upper and lower molds 20 and 10 and the intermediate mold 30 as shown in FIG. 3 .

1) 1st molding process

With the intermediate mold 30 interposed therebetween, the upper and lower molds 20 and 10 are molded. Cavities 22 and 12 are formed in the upper and lower molds 20 and 10, respectively, to which the runners 23 and 13, which are opened downward and upward, and into which the molding material is injected, are connected. In this way, when the upper and lower molds 20 and 10 are molded with the intermediate mold 30 interposed therebetween, the cavities 22 and 12 of the upper and lower molds 20 and 10 are not communicated by the intermediate mold 30 . and is demarcated Preferably, as shown, protrusions 32 are formed on the upper and lower surfaces of the intermediate mold 30 to form a space in which the insert member 120, that is, the planar heating element is inserted.

2) Molding material injection process

A paste-type shell molding agent for molding the shell 110 is injected into the cavities 22 and 12 of the upper and lower molds 20 and 10 . The type of the skin molding agent is not particularly limited, and it is natural that all materials capable of injection molding such as various resins and rubbers can be used.

3) Primary curing process

The shell molding agent injected into the cavities 22 and 12 of the upper and lower molds 20 and 10 is cured, but the degree of curing of the shell molding agent is adjusted so that some of the viscosity and fluidity (flowability) of the shell molding agent remain. . That is, the skin molding agent is less cured without being completely cured, preferably when the insert member 120 is placed on the shell molding agent injected into the cavity 12 of the lower mold 10 as described later. While I have enough support to support the load of the insert member 120, the shell molding agent injected into the cavities 22 and 12 of the upper and lower molds 10 and 20 can be attached to each other to form a single body. Adjust the degree of curing of the skin molding agent to have a certain degree of viscosity.

In this way, in each of the cavities 22 and 12 of the upper and lower molds 20 and 10 , the portions corresponding to the lower half and the upper half of the outer shell 110 are formed in a less hardened state. Hereinafter, for convenience of explanation, the upper and lower halves of the outer shell 100 in a less hardened state are referred to as semi-hardened outer half 112 and semi-hardened outer half 114 , respectively. As described above, in the present invention, 'semi-cured' means a state in which the skin molding agent is not completely cured, and it is natural that it does not mean that 50% is numerically cured.

4) Intermediate mold removal process

The upper mold 20 is separated from the intermediate mold 30 and the intermediate mold 30 is removed to open the upper and lower surfaces of the upper and lower molds 20 and 10 .

5) Planar heating element arrangement process

The insert member 120 , that is, the planar heating element is positioned on the semi-hardened outer skin lower half 114 formed in the cavity 12 of the lower mold 10 . Concave depressions 116 and 118 are formed on the bottom and top surfaces of the semi-hardened outer half 112 and the semi-hardened outer half 114 by the protrusion 32 of the intermediate mold 30, and these depressions 116, 118 ) so that the planar heating element is located.

6) Secondary molding process

The upper and lower molds 20 and 10 are molded together. Since the semi-hardened outer half 112 and the bar-hardened outer skin lower half 114 are less hardened and have some viscosity and fluidity, when the upper and lower molds 20 and 10 are molded, the semi-hardened outer shell upper half 112 and the upper and lower surfaces of the semi-hardened outer half 114 are attached to each other to form an integral body, and the insert member 120, that is, a planar heating element, is embedded between the semi-hardened outer skin upper half 112 and the semi-hardened outer skin lower half 114. In addition, since the semi-hardened upper half 112 and the semi-hardened outer half 114 are in a less hardened state and have some fluidity, the semi-hardened outer half 112 and the semi-hardened outer half 114 are the surface shape of the planar heating element. According to the flow, the planar heating element 120, the semi-rigid shell upper half 112 and the semi-hardened shell lower half 114 are in close contact with each other. Of course, at this time, the connection portion for connecting to the external power line of the planar heating element is exposed to the outside.

In particular, since the semi-hardened outer half 112 and the semi-hardened outer half 114 are in a cured state to some extent, the planar heating element does not deviate from its position between the semi-hardened outer half 112 and the semi-hardened outer half 114. and maintain the correct position.

7) Secondary curing process

The semi-hardened outer shell upper half 112 and the semi-hardened outer shell lower half 114 formed in the cavities 22 and 12 of the upper and lower molds 20 and 10 are further hardened so that they are completely cured.

8) demoulding process

The upper and lower molds 20 and 10 are spaced apart, and the molded product is demolded.

When the heating pad is manufactured in this way, the insert member 120, that is, the planar heating element, is maintained in its original position without sagging or flowing. Therefore, if the present invention is used, it is possible to easily manufacture a product in which the insert member 120 having a property of being flexible or easily deformed by an external force is embedded so that defects do not occur.

In this embodiment, the insert member 120 is made of a planar heating element, so the present invention is exemplified as being applied to the heating pad manufacturing, but the insert member 120 may be made of various materials such as FPC, PCB, cloth, paper, and the like, and as such, the insert member By changing the type of (120), the present invention can be applied to the manufacture of various products.

Hereinafter, other embodiments of the present invention will be described, but descriptions of the same configurations and effects as those of the above-described embodiments will be omitted.

5 to 9 show a second embodiment of the present invention, in which the cup holder 200 is manufactured by the insert injection molding method as described above.

The cup holder 200 has a metal band inserted into the insert member 120 inside the shell 110 made of silicone rubber, and is manufactured in the same manner as in the above-described embodiment.

The insert member 120, that is, the metal band has a predetermined length, but has a cross section curved to one side as shown in FIG. 6, and when the cross section curved by an external force is flattened, the Both ends in the longitudinal direction are bent by the repulsive force and elastically deformed into a C shape. Since such a metal band is known, a detailed description thereof will be omitted. In this embodiment, two metal bands are exemplified to be inserted horizontally side by side, but only one relatively wide metal band may be inserted.

The cup holder 200 is manufactured in the same manner as in the above-described embodiment using the upper and lower molds 2010 and the intermediate mold 30 as shown in FIGS. 7 and 8, and in this way, the cup holder 200 ), the insert member 120, ie, the metal band, is prevented from flowing or deformed by the injection force of the shell molding agent in the process of injecting the shell molding agent, thereby reducing product defects.

9 is a view showing a state in which the cup holder 200 according to the present embodiment is deformed into a C shape and inserted into the cup 9 .

10, lower mold 12, 22. Cavity
20. Upper mold 30. Middle mold
32. Projection 100. Heating member
110. Shell 116, 118. Depression
120. Insert member 200. Cup holder

Claims (3)

As an insert injection method for molding a product in which the insert member 120 is inserted in the shell 110,
The lower mold 10 and the upper mold 20 each formed with cavities 12 and 22 connected to the runners 13 and 23 that are opened upward and downward and into which the molding material forming the shell 110 is injected are formed into a plate shape. a primary molding process of molding with an intermediate mold 30 of
a shell molding agent injection process of injecting a shell molding agent forming the shell 110 into the cavities 22 and 12 of the upper and lower molds 20 and 10;
The shell molding agent injected into the cavities 22 and 12 of the upper and lower molds 20 and 10 is cured so that the viscosity and fluidity of the shell molding agent are not completely lost, but partially remain, and the upper and lower molds a primary curing process of forming the semi-hardened upper half 112 and the semi-hardened lower half 114 of the outer skin in a less hardened state in the cavities 22 and 12 of (10, 20);
an intermediate mold removal process of separating the upper and lower molds 20 and 10 and removing the intermediate mold 30;
an insert member arrangement process of placing the insert member 120 on the semi-hardened outer half 114 of the less hardened state formed in the cavity 12 of the lower mold 10;
a secondary molding process in which the upper mold 20 is molded on the lower mold 10 and the semi-hardened outer half 112 and the semi-hardened outer half 114 are integrally attached;
a secondary curing process of additionally hardening the semi-hardened outer half 112 and the semi-hardened outer half 114 to completely lose viscosity and fluidity; and
Insert injection method comprising the; a demolding process of separating the upper and lower molds (20,10) and demolding the molded product.
According to claim 1,
On the upper or lower surface of the intermediate mold 30, protrusions 32 protruding upward and downward are formed, and on the upper and lower surfaces of the semi-hardened outer shell upper half 112 and the semi-hardened outer shell lower half 114, the protrusions 32 Depressed portions 116 and 118 are formed by the
In the insert member arrangement process, insert injection molding method, characterized in that the insert member (120) is disposed in the depression (116,118).
It is prepared by the method according to claim 1 or 2,
The insert member 120 is made of a metal band whose cross section in the width direction is curved to one side and is deformed into a C shape by a repulsive force that is flattened by an external force,
The shell molding agent forming the shell (110) is a cup holder, characterized in that made of silicone rubber.

Images