KR102165436B1 - A method for manufacturing the container by injection moulding - Google Patents

Abstract

The present invention relates to a method for manufacturing a container by injection bonding capable of manufacturing a container having a shape that is difficult or impossible to manufacture by an injection method by bonding two injection products constituting one container by new injection. The method for manufacturing a container by injection bonding according to the present invention includes the steps of: 1) preparing a first mold for injecting a first injection product having a first bonding surface; 2) preparing a second mold having a second bonding surface bonded with the first injection product and the first bonding surface therebetween, and injecting a second injection product that is bonded to the first injection product to form a container; 3) injecting the first and second injection products using the first mold and the second mold, respectively; 4) manufacturing a container by performing injection bonding between the first bonding surface and the second bonding surface while setting the first and second injection products to have the first bonding surface and the second bonding surface facing each other; and 5) separating the first mold and the second mold and discharging the container.

Description

Container manufacturing method by injection bonding {A METHOD FOR MANUFACTURING THE CONTAINER BY INJECTION MOULDING}

The present invention relates to a container manufacturing method, and more particularly, by bonding two injection products constituting one container by new injection to manufacture a container having a shape that is difficult or impossible to manufacture by the injection method. It relates to a container manufacturing method.

The injection method is a method of producing parts by melting raw plastic materials and injecting them into a mold. Most of the plastic products we use are widely used methods that are produced by this injection method.

In general, the mold used in the injection method consists of an upper mold and a lower mold, and a plastic resin is injected into the space between the upper and lower molds at high pressure, and the molded product is placed in the upper and lower molds. It separates from the mold to produce the product.

However, as shown in FIG. 12, in the case of forming the container 90 by engaging the upper mold 92 and the lower mold 91, the bottle-shaped container 90 having the neck portion formed, the narrow portion of the bottle inlet Therefore, there is a problem that manufacturing is impossible because the inner shape cannot escape through the undercut.

Therefore, in order to solve this problem, conventionally, as shown in FIG. 13, after injecting the bottle-shaped container 90 with one mold 93, a method of manufacturing by injecting air at high pressure into the inner space has been proposed. have.

However, since the bottle-shaped container 90 manufactured by this method is not manufactured by an accurate mold, as shown in FIG. 14, its internal shape is irregularly formed, and the bottom portion protrudes convexly to the center. There is a problem that is limited to the shape.

Therefore, there is an urgent need to develop an injection technology that can be applied to parts having shapes that cannot be manufactured by a general injection process, such as bottle-shaped containers.

The technical problem to be solved by the present invention is to provide a container manufacturing method by injection bonding capable of manufacturing a container having a shape that is difficult or impossible to manufacture by the injection method by bonding two injection products forming one container by new injection. Is to do.

A method of manufacturing a container by injection bonding according to the present invention for solving the above-described technical problem includes: 1) preparing a first mold for injecting a first injection product having a first bonding surface; 2) preparing a second mold having a second joint surface bonded with the first injection product and the first bonding surface therebetween, and injecting a second injection product that is bonded to the first injection product to form a container; 3) injecting the first and second injection products using the first mold and the second mold, respectively; 4) manufacturing a container by performing injection bonding between the first bonding surface and the second bonding surface while the first and second injection products are set to face the first bonding surface and the second bonding surface ; 5) separating the first mold and the second mold, and discharging the container.

And in the present invention, the first mold includes two identical upper core molds formed at a predetermined interval on the upper portion, and the second mold is formed at the lower portion at the same interval as the spaced apart from the upper core mold. It is preferred to include four lower core molds.

In addition, in the present invention, the upper core mold rotates to alternately move the first injection position and the joint injection position, and the lower core mold alternately moves the second injection position and the joint injection position, and the joint injection In the position, it is preferable that the upper core mold and the lower core mold are engaged.

In addition, in the method of manufacturing a container by injection bonding according to the present invention, the injection in steps 3) and 4) is simultaneously performed, but in the first step 3), the first injection position and the second injection position are respectively It is preferable that the first and second injection products are injected, and the bonding injection is omitted in a state where the empty first and second rotary molds are engaged in the bonding injection position.

In addition, in step 4) in the present invention, the upper core mold rotates in a state in which the first injection product injected from the first injection position is inserted, and moves to the joint injection position, and the lower core mold is injected from the second injection position. It is preferable that the bonded injection is performed in a state in which the second injection product is inserted and rotated to move to the bonding injection position.

In addition, step 5) in the present invention is preferably performed while the upper core mold moves upward and the lower core mold pushes up the container.

In addition, in the container manufacturing method by injection bonding according to the present invention, the first and second molds divide a bottle-shaped container in which an undercut exists in a completed form into two molds in a state in which the undercut is excluded, and the first mold It is preferable that the silver includes two upper core molds in the upper part, and the second mold includes two lower core molds in the lower part.

In addition, in the present invention, it is preferable that the first and second molds are divided at the neck of the bottle-shaped container.

Further, in the present invention, it is preferable that the first and second molds are divided at the bottom of the bottle-shaped container.

In addition, in the method of manufacturing a container by injection bonding according to the present invention, the first and second molds are divided into two molds in a state in which the upper and lower portions of the container in an empty state are excluded from undercuts, and the first mold is It is preferable to include two upper core molds in the upper part, and the second mold including two lower core molds in the lower part.

In addition, in the method of manufacturing a container by injection bonding according to the present invention, the first mold is made of a colorless upper mold having an overall shape of the container, and the second mold has a shape covering the lower part of the upper mold and is colored. It is made of a lower mold that is injected into, and the first mold includes two upper core molds at the top, and the second mold preferably includes two lower core molds at the bottom.

In addition, in the present invention, it is preferable that the second mold has a shape whose thickness decreases from the center toward the outside.

In addition, in the present invention, it is preferable that the first mold is formed of a container shape obtained by thinly dividing a thick portion of the container as an upper mold, and the second mold is formed of a lower mold in the shape of the rest of the container shape.

In addition, in the method for manufacturing a container by injection bonding according to the present invention, a third mold is further prepared between the first and second molds, and the first, second, and third molds are formed at 120° angles in the upper and lower molds. It is preferable to be divided and arranged.

According to the method for manufacturing a container by injection bonding according to the present invention, it is possible to quickly and accurately manufacture a container having a shape that is difficult, impossible, or difficult to manufacture by the injection method by joining two injection products constituting one container by a new injection method. There is an advantage.

1 is a flow chart of a method for manufacturing a container by injection bonding according to an embodiment of the present invention.
2 to 4 are diagrams showing steps of a method for manufacturing a container by injection bonding according to an embodiment of the present invention.
5 to 8 are views showing steps of a method for manufacturing a container by injection bonding according to another embodiment of the present invention.
9 is a view showing a process of a container manufacturing method by injection bonding according to another embodiment of the present invention.
10 is a view showing a process of a container manufacturing method by injection bonding according to another embodiment of the present invention.
11 is a view showing a process of a container manufacturing method by injection bonding according to another embodiment of the present invention.
12 and 13 are views illustrating a conventional injection method of a bottle-shaped container.
14 is a diagram illustrating a shape of a bottle-shaped container manufactured by a conventional injection method.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Example 1>

The container manufacturing method by injection bonding according to the present embodiment begins with the steps (S100, S200) of preparing a mold, as shown in FIG. 1, and the mold is a mold for manufacturing one container (1). It is prepared by being divided into first and second molds 100 and 200 capable of this injection process.

At this time, the injection products manufactured by injection by the first and second molds 100 and 200 respectively are referred to as first and second injection products 10 and 20, and in this embodiment, the first and second injection products 10 and 20 are Finally, the finished container 1 is integrated and manufactured by injection bonding. Accordingly, the first and second injection products 10 and 20 have a bonding surface that is bonded by injection bonding, which is referred to as the first and second bonding surfaces 11 and 21.

Here,'injection bonding' is a method in which the gap between the bonding surfaces of two injection products injected by different molds is filled by new injection with the same resin, and a part of the bonding surface is melted to form a new one. Say what to do. In this way, when two different injection products are joined by injection bonding, they are simultaneously molded with the same resin at high temperature. Therefore, the bonding surface of both injection products and the bonding material filled between them are partially dissolved and molded to integrate without leaving any traces of bonding. It has the advantage of being.

The step of preparing the mold is divided into the steps of preparing the first and second molds. These steps may be performed simultaneously or may be performed in reverse order. However, in this embodiment, the step (S100) of preparing the first mold is first described for convenience of description. The step of preparing the first mold (S100) is a step of preparing the first mold 100 for injecting the first injection product 10 having the first bonding surface 11.

Here, the first injection product 10 may be determined in a shape other than the bottom of the bottle-shaped container 1, for example, and the first mold 100 for injecting the same is as shown in FIG. Likewise, it is prepared by being divided into an upper mold 110 and a lower mold 120. At this time, the first injection product 10 includes a first injection surface 11 that is a part to be bonded to the second injection product 20 in a subsequent injection bonding process. Of course, the first injection product 10 may have a shape other than the neck of the bottle-shaped container.

In addition, the step of preparing the second mold 200 (S200) is a step of preparing the second mold 200 for injecting the second injection product 20. Here, the second injection product 20 has a second bonding surface 21 that is bonded with the first injection product 10 and the first bonding surface 11 therebetween, as shown in FIG. 4, It has a shape that forms the container 1 by injection bonding with the first injection product 10. Accordingly, the second mold 200 has a structure capable of injecting the second injection product 20 having this shape, as shown in FIG. 3, and is divided into an upper mold 210 and a lower mold 220. Ready.

Next, as shown in FIG. 1, a step (S300) of injecting the first and second injection products 10 and 20 is performed. In this step (S300), as shown in Figs. 2 and 3, the resin for injection is injected using the first mold 100 and the second mold 200 to 2 Each injection product 20 is injected.

Next, the step (S400) of injection bonding the first and second injection products 10 and 20 is performed. In this step (S400), as shown in FIG. 4, the first injection product 10 and the second injection product 20 are placed so that the first bonding surface 11 and the second bonding surface 21 face each other. 1 With the upper mold 110 of the mold 100 and the lower mold 220 of the second mold 200 set, the gap between the first bonding surface 11 and the second bonding surface 21 The container (1) is manufactured by performing injection bonding to (3).

Next, as shown in FIG. 1, a step (S500) of discharging the manufactured container 1 is performed. In this step (S500), the first mold 100 and the second mold 200 are separated, and the container 1 is discharged.

<Example 2>

The container manufacturing method by injection bonding according to this embodiment is a container manufacturing method of substantially the same concept as that of Example 1, but by newly creating the structure of the first and second molds, the manufacturing process is automated and the manufacturing time is shortened. Offer a way to do it.

First, the steps S100 and S200 of preparing the first and second molds 100 and 200 are performed. These steps may be prepared at the same time or may be performed in a different order. However, for convenience of description, the step (S100) of preparing the first mold will be first described. In this step (S100), a first mold 100 capable of injecting the first injection product 10 is prepared, but as shown in FIGS. 5 to 8, an upper part including a rotatable upper core mold 110 The first mold 100 is prepared with the mold 101 and the lower mold 102.

At this time, in the upper core mold 110, as shown in FIG. 5, two mold shapes 111 capable of injecting the first injection product 10 are formed at predetermined intervals, and the two mold shapes ( 111) is installed to be rotatable about the first rotation shaft (X1). In this way, when the upper core mold 110 rotates by the first rotation shaft X1, the mold shape 111 alternately moves the first injection position P1 and the bonding injection position P3.

Next, in the step of preparing the second mold 200 (S200), a second mold 200 capable of injecting the second injection product 20 is prepared, and the second mold 200 is shown in FIGS. As shown in Fig. 8, it is prepared by being divided into a lower mold 102 and an upper mold 101 including a rotatable lower core mold 220. Here, in the lower core mold 220, two mold shapes 221 capable of injecting the second injection product 20 are formed to be spaced apart at the same distance as that of the upper core mold 110, and the two The mold shape 221 is rotatably installed about the second rotation axis X2.

When the lower core mold 200 is rotated by the second rotation shaft X2 in this way, the mold shape 221 alternately moves the second injection position P2 and the bonding injection position P3. do.

Meanwhile, in this embodiment, the first mold 100 for molding the first injection product and the second mold 200 for molding the second injection product have a structure in which the upper mold 101 and the lower mold 102 are shared. The first and second injection steps (S300) and the injection bonding step (S400) can be performed quickly and accurately, and furthermore, the first and second injection steps (S300) and the injection bonding step (S400) may be simultaneously performed. This will be explained later.

Next, a step (S300) of injecting the first and second injection products 10 and 20 using the first and second molds 100 and 200 is performed. In this step (S300), as shown in FIG. 1, resin is injected into the first mold 100 and the second mold 200 in a state in which the upper mold 101 and the lower mold 102 are in close contact. Do the injection work.

However, at the injection bonding point where the upper core mold 110 and the lower core mold 220 located at the injection joint position P3 are engaged, as shown in FIG. 5, the current upper core mold 110 and the lower core mold 220 Since the interlocked space (S) is empty, the injection-joined resin injection port 104 does not inject the resin.

Next, the step (S400) of injection bonding the first and second injection products 10 and 20 is performed. In this step (S400), while the first and second injection products 10 and 20 are injected, the upper core mold 110 and the lower core mold 220 are rotated once so that the first and second injection products are inserted. 7, the upper core mold 110 and the lower core mold 220 are engaged at the injection joint position, and then resin is injected to form the first and second injection products 10 and 20. Join.

Of course, during the injection bonding, as shown in FIG. 8, the first and second injection positions P1 and P2 are also subjected to subsequent injection of the first and second injection products 10 and 20 at the same time.

Next, as shown in FIG. 6, a step (S500) of discharging the manufactured container 1 proceeds. In this step (S500), the upper core mold 110 moves upward, and the lower core mold 220 pushes up the container 1 to proceed. Of course, it is also possible to drain the container in other ways.

<Example 3>

In this embodiment, unlike Examples 1 and 2, a container having a shape having an empty space (S2), not a bottle, is manufactured.

In this case, as shown in FIG. 9, the first and second molds 300 and 400 have two upper molds 310 and 410 in a state in which undercuts are excluded from the upper and lower portions of the container, respectively, in a state where the inside is empty. And lower molds 320 and 420 are prepared. In addition, first and second injection surfaces, which are injection-bonded parts, are formed on the first and second injection products manufactured by the first and second molds 300 and 400, respectively.

And in this embodiment, the first mold 300 includes two upper core molds at the top, and the second mold 400 includes two lower core molds at the bottom to automate the process and shorten the process time. It is desirable for

<Example 4>

In this embodiment, gradation molding in which the color becomes darker or lighter is performed.

In this case, as shown in FIG. 10, a portion to be subjected to gradation molding is divided from other portions to prepare first and second molds 500 and 600, respectively. Of course, even in this case, the first and second molds 500 and 600 are formed in a state in which the undercut is excluded, and the first and second injection products manufactured by the first and second molds are respectively injection-joined. The first and second exit surfaces are formed. Specifically, as shown in FIG. 10, the first mold 500 includes an upper mold 510 and a lower mold 520 for injecting a first injection product injected in a colorless manner having an overall shape 2 It is preferable that the mold 600 includes an upper mold 610 and a lower mold 620 for injecting a second injection product that is injected in color with a shape covering the lower part of the first injection product.

Also in this embodiment, the first mold 500 includes two upper core molds at the top, and the second mold 600 includes two lower core molds at the bottom to automate the process and shorten the process time. It is desirable for

<Example 5>

In this embodiment, a container that takes a lot of time for general injection is manufactured because a thick portion exists in the manufactured container. In this case, the first mold 700 includes an upper mold 710 and a lower mold 720 in a container shape obtained by thinly dividing a thick portion of the container, and the second mold 800 is the rest of the container shape. It is preferable that the shape of is made of an upper mold 810 and a lower mold 820.

On the other hand, if necessary, a third mold (not shown in the drawing) is further prepared between the first and second molds 700 and 800, and the first, second, and third molds are each 120° to the upper and lower molds. It is preferable to be arranged at intervals because it can be applied to a container having a thicker shape, and a process time can be shortened.

1: container 10: first injection product
20: second injection product 100: first mold
200: second mold

Claims (14)

1) preparing a first mold for injecting a first injection product having a first bonding surface;
2) preparing a second mold having a second joint surface bonded with the first injection product and the first bonding surface therebetween, and injecting a second injection product that is bonded to the first injection product to form a container;
3) injecting the first and second injection products using the first mold and the second mold, respectively;
4) manufacturing a container by performing injection bonding between the first bonding surface and the second bonding surface while the first and second injection products are set to face the first bonding surface and the second bonding surface ;
5) separating the first mold and the second mold and discharging the container; including,
The first mold includes two identical upper core molds formed at a predetermined interval on the upper portion thereof,
The second mold includes two identical lower core molds formed to be spaced apart from each other at the same distance as the upper core mold spacing distance,
In step 4),
The upper core mold rotates in a state in which the first injection product injected from the first injection position is inserted and moves to the joint injection position, and the lower core mold rotates in a state in which the second injection product injected from the second injection position is inserted. The method of manufacturing a container by injection bonding, characterized in that bonding injection is performed while moving to the bonding injection position. delete The method of claim 1,
The upper core mold rotates to alternately move the first injection position and the bonding injection position, and the lower core mold alternately move the second injection position and the bonding injection position,
The container manufacturing method by injection bonding, characterized in that the upper core mold and the lower core mold are engaged in the joint injection position. The method of claim 3,
The injections in steps 3) and 4) are performed simultaneously, but in the first step 3), the first injection product and the second injection product are injected at the first injection position and the second injection position, respectively, and at the joint injection position The container manufacturing method by injection bonding, characterized in that the bonding injection is omitted while the empty first and second rotating molds are engaged. delete The method of claim 4, wherein step 5),
The container manufacturing method by injection bonding, characterized in that the upper core mold moves upward and the lower core mold pushes the container up and progresses. The method of claim 1,
The first and second molds divide a bottle-shaped container in which an undercut exists in a completed form into two molds in a state in which the undercut is excluded, and the first mold includes two upper core molds at the top, and the first mold 2 The method of manufacturing a container by injection bonding, characterized in that the mold includes two lower core molds at the bottom. The method of claim 7, wherein the first and second molds,
A container manufacturing method by injection bonding, characterized in that it is divided at the neck of the bottle-shaped container. The method of claim 7, wherein the first and second molds,
A container manufacturing method by injection bonding, characterized in that it is divided at the bottom of the bottle-shaped container. The method of claim 1,
The first and second molds are divided into two molds in a state in which the upper and lower portions of the container in a state where the inside is empty are excluded from undercuts, and the first mold includes two upper core molds at the top, and the second The method of manufacturing a container by injection bonding, characterized in that the mold includes two lower core molds at the bottom. delete delete delete delete

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