KR20200117534A - Manufacturing method of injection molding product - Google Patents

Abstract

The present invention relates to a manufacturing method of an injection product. With an object to be injected bonded to a mold, the injection product comprises: an upper surface; a side surface extending downward from a rim of the upper surface; a receiving part located inside the side surface and extending downward from the upper surface; and a hook part extending from the inside of the side surface and extending toward the inside, and the mold comprises: a first core whose upper part is located inside the receiving part; a second core surrounding the first core and having an upper part positioned between the receiving part and the side surface; a third core which surrounds the second core, and in which at least a portion of the upper part comes in contact with a lower surface of the hook part; and a fourth core which surrounds the third core, and in which at least a portion of the upper part comes in contact with the lower end of the side surface. In addition, the manufacturing method of an injection product comprises: a first step in which the second core moves upward with respect to the first core and the third core to form a space between the lower surface of the hook part and the upper surface of the third core, and to separate the upper surface from the first core; a second step in which the fourth core moves upward with respect to the second core, and the hook part is deformed so that the injection product moves upward with respect to the second core; and a third step of separating the injection product from the mold.

Description

Manufacturing method of injection molding product

The present invention relates to a method of manufacturing an injection product, and more particularly, to a method of manufacturing an injection product in which a plurality of cores are operated so that the injection product can be molded while minimizing the deformation of the injection product.

When two contents of different ingredients are stored in separate spaces in one container, the storage period is much longer than when the different ingredients are mixed.

In addition, if the main contents such as liquid form and the auxiliary contents are stored separately and mixed immediately before eating, the taste component does not change. Therefore, the taste and nutrition of food and beverages are not changed when the main contents and auxiliary contents are mixed and stored. This becomes much better.

In addition, the need for such a structure is increasing because a structure in which two contents (a fluid beverage and a solid pill) are stored separately in one container in a similar manner as described above provides convenience to the user.

(Patent Document 1) KR10-2000-0065434 A

(Patent Document 2) KR10-1225364 B1

The problem to be solved by the present invention is to form a space between the lower surface of the hook part and the upper surface of the third core, and then move the first core upward, thereby minimizing the deformation of the injection product and separating the injection product from the mold. It is to provide a method of manufacturing.

The method of manufacturing an injection product of the present invention for solving the above problem is, in a state in which the injection product is coupled to a mold, the injection product is located on an upper surface, a side extending downward from the rim of the upper surface, and located inside the side surface. A receiving portion extending downward from and a hook portion extending from the inside of the side surface and extending toward the inside, wherein the mold includes a first core having an upper portion positioned inside the receiving portion, and surrounding the first core, The upper portion surrounds the second core and the second core positioned between the receiving portion and the side surface, at least a portion of the upper portion surrounds the third core and the third core in contact with the lower surface of the hook portion, and at least a portion of the upper portion is A fourth core in contact with the lower end of the side surface, and the second core moves upward with respect to the first core and the third core, thereby forming a space between the lower surface of the hook portion and the upper surface of the third core. The first step of forming and separating the upper surface from the first core, the fourth core is moved upward with respect to the second core, the hook portion is deformed, and the injection product moves upward with respect to the second core And a third step of separating the injection product from the mold.

In one embodiment of the present invention, in the above state, the hook portion may be located between the second core and the third core.

In one embodiment of the present invention, in the above state, another part of the third core may contact the second core.

In one embodiment of the present invention, in the state, the hook portion may include a first hook portion extending from the inside of the side to an inward downward direction and a second hook portion extending from the first hook portion toward the inside. have.

In one embodiment of the present invention, in the second step, the second hook portion may be deformed to face downward.

In one embodiment of the present invention, in the second step, the hook portion may be deformed to face downward.

In one embodiment of the present invention, in the first step, the fourth core may move upward with respect to the third core.

In one embodiment of the present invention, in the first step, at least a part of the upper portion of the fourth core may maintain a state in contact with the lower portion.

In one embodiment of the present invention, after the third step, the hook portion may further include a fourth step of deforming so that the hook portion faces downward and the hook portion faces inward.

In an embodiment of the present invention, the hook portion may be formed in a plurality of portions extending from different portions of the inner side of the side surface and spaced apart from each other.

In one embodiment of the present invention, the injection product further comprises a wing portion positioned between the side surface and the receiving portion, extending downward from the upper surface, and the second core includes a wing groove in which the wing portion is accommodated, , In the above state, the wing portion may be accommodated in the wing groove.

In one embodiment of the present invention, the thickness of the wing portion may be reduced from top to bottom.

In one embodiment of the present invention, the wing portion may extend shorter than the receiving portion.

In one embodiment of the present invention, in the second step, the wing portion may be separated from the wing groove.

In an embodiment of the present invention, the thickness of the receiving portion may decrease from top to bottom.

In one embodiment of the present invention, in the first step, a part of the receiving part is separated in a space between the first core and the second core, and another part is separated between the first core and the second core. Can be accommodated in space.

In one embodiment of the present invention, the injection product further comprises a threaded portion extending from the inside of the side, the second core includes a threaded groove formed on the side, and in the state, the threaded portion is in the threaded groove May be accommodated.

In one embodiment of the present invention, the threaded portion may be located above the hook portion.

In one embodiment of the present invention, in the second step, the threaded portion may be separated from the threaded groove.

In one embodiment of the present invention, in the third step, the fourth core may push the lower end upward to move the injection product upward.

In an embodiment of the present invention, the side surface may include an upper side and a lower side, and the upper side and the lower side may be spaced apart from each other, and at least a portion may be connected by a cutout.

In one embodiment of the present invention, the mold may further include a slide core positioned in a space between the upper side and the lower side, and further comprising a slide step of separating the slide core in the interspace. have.

In an embodiment of the present invention, the slide step may be performed before the first step.

In one embodiment of the present invention, the injection product is polypropylene (PP: polypropylene), high density polyethylene (HDPE: High Density Polyethylene), low density polyethylene (LDPE: Low Density Polyethylene), and linear low density polypropylene (LLDPE: Liner Low Density). Polyethylene) material.

In one embodiment of the present invention, the first core may include a cooling tube.

In one embodiment of the present invention, at least a portion of the cooling pipe may be located in an inner space surrounded by the receiving portion in the above state.

In the method of manufacturing an injection product according to an embodiment of the present invention, after forming a space between the lower surface of the hook portion and the upper surface of the third core, the first core is moved upward, thereby minimizing the deformation of the injection product and removing the injection product from the mold. Can be separated.

1 is a perspective view of an injection product manufactured by a method of manufacturing an injection product according to an embodiment of the present invention as viewed from one direction.
2 is a cross-sectional view of FIG. 1.
3 is a cross-sectional view showing a state in an injection step in a method of manufacturing an injection product according to an embodiment of the present invention.
4 is a flow chart showing a method for manufacturing an injection product according to an embodiment of the present invention.
5 is a cross-sectional view showing a slide step in a method of manufacturing an injection product according to an embodiment of the present invention.
6 is a cross-sectional view showing a first step in a method of manufacturing an injection product according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a deformation of a hook portion in a second step in a method of manufacturing an injection product according to an embodiment of the present invention.
8 is a cross-sectional view illustrating a state in which the hook portion of FIG. 7 is fully opened.
9 is a cross-sectional view showing a state in which an injection product is completely separated from a first core and a second core.
10 is a cross-sectional view showing a third step in a method of manufacturing an injection product according to an embodiment of the present invention.
11 is a partial detailed view showing area A of FIG. 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that adding a detailed description of a technology or configuration already known in the relevant field may make the subject matter of the present invention unclear, some of these will be omitted from the detailed description. In addition, terms used in the present specification are terms used to appropriately express embodiments of the present invention, and these may vary according to related people or customs in the field. Accordingly, definitions of these terms should be made based on the contents throughout the present specification.

The terminology used herein is for reference only to specific embodiments and is not intended to limit the invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. As used in the specification, the meaning of'comprising' specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

The present invention relates to a method of manufacturing an injection product using a mold. Hereinafter, a method of manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a perspective view of an injection product manufactured by a method of manufacturing an injection product according to an embodiment of the present invention as viewed from one direction, and FIG. 2 is a cross-sectional view of FIG. 1.

The injection product 100 will be described with reference to FIGS. 1 and 2. The injection product 100 is completed through the manufacturing method of the injection product of the present invention, and is polypropylene (PP: polypropylene), high density polyethylene (HDPE: High Density Polyethylene), low density polyethylene (LDPE: Low Density Polyethylene), and linear low density polypropylene. It can be formed of (LLDPE: Liner Low Density Polyethylene) material.

The injection product 100 includes an upper surface 110, a side surface 120, a threaded portion 130, a receiving portion 140, a wing portion 150, and a hook portion 160.

The upper surface 110 corresponds to the upper surface of the injection product 100. The edge portion of the upper surface 110 may be formed higher than the central portion of the upper surface 110. That is, the edge portion of the upper surface 110 and the central portion of the upper surface have a step difference. The upper surface 110 may include a central upper surface 111 positioned at a central portion and an edge upper surface 112 positioned at an edge portion of the central upper surface 111.

The end of the upper surface 110 may have a side surface 120 extending vertically downward. That is, the upper surface 110 and the side surface 120 have a bent shape.

The side surface 120 extends downward from the edge of the upper surface 110. This side surface 120 includes an upper side surface 121 and a lower side surface 122.

The upper side 121 extends a predetermined distance downward from the end of the upper surface 110. The lower side 122 may have a ring shape, and is located under the upper side 121. The upper side 121 and the lower side 122 are spaced apart from each other, but at least some of them are connected by the cutout 123. In addition, a protrusion 126 extending downward may be formed at a lower end of the lower side 122.

The cutout 123 is coupled to the lower end of the upper side 121 and the upper end of the lower side 122. A plurality of cutouts 123 are formed. Accordingly, a cutout space 125 formed by the upper side 121, the lower side 122, and the plurality of cutouts 123 is formed.

In this case, the thickness of the cutout 123 is formed to be thinner than that of the upper side 121 and the lower side 122. In the above structure, when the user presses the lower side 122 after holding the upper side 121, the upper side 121 and the lower side 122 are separated by the cutout 123 by the pressing force. It supports easy separation.

The threaded portion 130 extends from the inside of the side surface 120. Specifically, the threaded thread 130 may be formed in a spiral shape along the inner surface of the side surface 120. In addition, the screw thread 130 may be formed to protrude toward the inside.

The receiving part 140 is located inside the side surface 120 and extends downward from the upper surface 110. Specifically, the receiving portion 140 may extend a predetermined distance downward from a portion where the upper surface 111 of the central portion and the upper surface of the edge 112 are in contact (=stepped portion). In this case, the receiving part 140 may be formed longer than the upper side surface 121.

In addition, the receiving portion 140 forms a space S1 formed with the upper surface 111 of the central portion. When the finished product injection product 100 is applied as a bottle cap, a pill receiving unit (not shown) formed integrally with the injection port of the bottle may be inserted between the receiving unit 140 and the side surface 120. The pill can be located in the pill receiving part inside the space (S1).

In addition, the accommodating portion 140 can be effectively separated from the mold as the thickness decreases from the top to the bottom, and the description of the accommodating portion 140 will be described in more detail together with the mold to be described later.

The wing portion 150 is located between the side surface 120 and the receiving portion 140, and extends downward from the upper surface 110. More specifically, the wing portion 150 may be formed extending downward from the central portion of the upper edge 112.

In addition, the wing portion 150 can be effectively separated from the mold as the thickness decreases from the top to the bottom, similar to the receiving portion 140.

Additionally, the wing portion 150 extends shorter than the receiving portion, and the structure of the wing portion 150 can secure structural stability for the upper edge 112. The wing portion 150 is formed shorter than the receiving portion 140, which is to ensure the structural stability described above and at the same time to easily separate the injection product 100 from the mold 200.

Meanwhile, a space S2 formed by the upper edge 112, the side surface 120, the receiving part 140, and the wing part 150 may be formed inside the injection product 100.

The hook portion 160 extends from the inside of the side surface 120. Specifically, the hook portion 160 extends upward or laterally.

First, as illustrated in FIG. 2, when the hook portion 160 extends upwardly inside, it may have a hook shape. The hook portions 160 may be formed in a plurality that extend from different portions of the inner side of the side surface 120 and are spaced apart from each other. According to the above-described structure, a space 165 is formed between the plurality of hook portions 160. In this case, the spaces 165 may be formed at equal or non-equal intervals.

Next, the hook portion 160 may not only extend upwardly, but also extend toward the side. In this case, the hook portion 160 can be separated from the mold more easily than the hook portion 160 extending inward and upward.

In addition, the hook portion 160 is a first hook portion 161 extending downward from the inside of the side surface 120 in a state in which the upper mold and the lower mold are combined to inject a resin material and then cool and cure the resin material. ) And a second hook portion 162 extending from the first hook portion 161 toward the inside.

3 is a cross-sectional view showing a state in an injection step in a method of manufacturing an injection product according to an embodiment of the present invention.

3 shows that the injection product 100 is formed in a mold in which the upper mold and the lower mold are combined. The mold includes an upper mold located at an upper portion and a lower mold located at a lower portion of the upper mold, and hereinafter, the lower mold will be referred to as a mold for description.

The mold 200 includes a first core 210, a second core 220, a third core 230, a fourth core 240, and a slide core 250.

In the first core 210, an upper portion of the first core 210 is located inside the receiving portion 140. The first core 210 may be formed of a metal material having high thermal conductivity. The first core 210 may have a pipe or polyhedral shape elongated in one direction. As the upper end of the first core 210 is formed as a flat surface, it comes into contact with the upper surface 111 of the central portion of the injection product 100.

In addition, the first core 210 may include a cooling tube 211. At least a portion of the cooling pipe 211 is located in an inner space surrounded by the receiving portion 140 while being coupled to the mold.

Specifically, referring to FIG. 3, the cooling pipe 211 is illustrated in a tubular shape, but is not limited thereto. As an example, it may have a'U' shape positioned to be adjacent to the inner surface of the first core 210. Cooling water capable of cooling heat by heat conduction or low temperature air may be used inside the cooling pipe 211. The cooling pipe 211 sequentially cools the first core 210 and the injection product 100 as cooling water or low-temperature air is injected and circulated therein. The cooling pipe 211 finally cools the molded product 100 in a fluid resin state to be cured.

The second core 220 surrounds the first core 210, and an upper portion of the second core 220 is positioned between the receiving portion 140 and the side surface 120. The inner surface of the second core 220 is formed to be in contact with the outer surface of the first core 210. In addition, the upper end of the second core 220 is positioned to be in contact with the upper edge 112 of the injection product 100.

In addition, a threaded groove 221 formed to correspond to the threaded portion 130 formed on the side 120 of the injection product 100 is formed on the side of the second core 220. The threaded groove 221 is formed vertically inwardly recessed in the direction of the central axis of the first core 210.

The second core 220 may include a wing groove 222 in which the wing portion 150 is accommodated. The wing groove 222 may be recessed downward from the upper end of the second core 220. At this time, the shape and size of the wing groove 222 is preferably formed to accommodate the wing portion 150 extending downwardly from the upper edge 112.

In a state coupled to the mold according to the above, the wing portion 150 is accommodated in the wing groove 222.

In addition, the second core 220 may have an upper width larger than a lower width, and accordingly, a step is formed in a portion connecting the upper and lower portions of the second core 220. The hook coupling portion 223 is formed at a portion connecting the upper and lower portions of the second core 220. Specifically, the hook coupling portion 223 is a component corresponding to the lower edge of the upper side of the second core 220 and may be formed to protrude outwardly and downward. The hook coupling portion 223 may be formed to correspond to each other because the hook portion 160 is surrounded and in contact with each other.

The third core 230 surrounds the second core 220, and at least a portion of the upper portion of the third core 230 contacts the lower surface of the hook portion 160. Specifically, the upper portion of the third core 230 may have a shape that becomes narrower from the center to the upper portion.

In a state coupled to the mold, the hook portion 160 is positioned between the second core 220 and the third core 230.

In addition, in a state coupled to the above-described mold, another part of the third core 230 comes into contact with the second core 220. A description of a portion of the third core 230 in contact with the third core 230 and the hook portion 160, as well as coupling and separation will be described in detail later.

The fourth core 240 surrounds the third core 230, and at least a portion of the upper portion of the fourth core 240 comes into contact with the protrusion 126, which is the lower end of the side surface 120.

The slide core 250 is located in a space between the upper side 121 and the lower side 122. In addition, at least a portion of the inner surface of the slide core 250 may be inserted into the cut-out space 125. According to the above structure, the slide core 250 serves to fix the injection product 100 in a state that is coupled to the mold, and when the injection product 100 is separated, the slide core 250 is separated from the injection product 100 do. A detailed description of this will be described later.

The above-described information so far relates to the injection step, and is for injecting an injection product using the above-described mold 200. That is, the injection step refers to curing by injecting a resin material and then cooling it in a state in which the upper and lower molds are combined.

Next, after the injection step is performed, the shape and coupling relationship of the mold and the injection product become a reference state before the separation step is performed.

Hereinafter, "state" means a reference state.

4 is a flow chart showing a method for manufacturing an injection product according to an embodiment of the present invention.

Hereinafter, a method of manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIG. 4.

Referring to FIG. 4, a method of manufacturing an injection product according to an embodiment of the present invention includes an injection step (S10), a step in which the slide core 250 is separated (S20), a hook portion 160 and a third core 230 The first step (S100) of forming a space (S3) therebetween, the second step (S200) in which the injection product 100 moves while the hook portion 160 is deformed (S200), and the injection product 100 is separated from the mold 200 And a third step (S300) of performing and a fourth step (S400) of restoring the hook unit 160.

Each of the above-described steps is not limited to being performed in the order listed above unless otherwise specified or causal relationship. However, hereinafter, it will be described based on what is performed in the order listed above.

The injection step (S10) may include injecting a resin material into the mold 200, cooling the resin material with a cooling tube 211, and forming the injection product 100 by curing the resin material. .

In the step of injecting the resin material into the mold 200, a mold mold having a shape to be molded is formed inside the mold 200 and then the resin material is injected into the mold 200. At this time, it is desirable to consider this because the result of the injection product 100 may vary depending on the type of resin material, injection speed, etc.

In the step of cooling the resin material with the cooling tube 211, the result of the injection product 100 may vary depending on the cooling rate of the resin material, so the cooling water or the temperature of the air injected into the cooling tube 211 is adjusted according to the desired specifications. It is desirable to do.

Since the step of curing the resin material to form the injection product is related to cooling the resin material in the step of cooling the resin material, it is preferable to apply it by adjusting the temperature of the cooling water or air injected into the cooling pipe 211.

5 is a cross-sectional view showing a slide step in a method of manufacturing an injection product according to an embodiment of the present invention.

Referring to FIGS. 3 and 5, in the mold 200, a slide step S20 in which the slide core 250 is separated in the interspace is performed. That is, to explain easily, the slide step (S20) is performed substantially simultaneously with the mold opening step in which the upper mold and the lower mold are separated.

5, the slide step (S20) is performed before the first step (S100), and the slide core 250 is opened.

Hereinafter, the steps after the state in which the injection product is coupled to the mold 200 will be described.

6 is a cross-sectional view showing a first step in a method of manufacturing an injection product according to an embodiment of the present invention.

A first step in a method of manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIG. 6.

6, the first step (S100) of forming a space (S3) between the hook portion 160 and the third core 230 is the lower surface of the hook portion 160 and the third core 160 This is a step of forming a space S3 between the upper surfaces. In the first step (S100), the second core 220 moves upward with respect to the first core 210 and the third core 230, and the first core 210 and the third core 230 are in their original positions. Keep it.

Here, the second core 220 pushes up the upper surface 110 of the injection product 100. Since the injection product 100 moves upward with respect to the first core 210, the upper surface 110 of the injection product 100 is spaced apart from the top of the first core 210.

In this process, a part of the receiving part 140 is separated in the space between the first core 210 and the second core 220, and another part is still between the first core 210 and the second core 220. Be accommodated in space. As described above, since the thickness of the accommodating part 140 decreases from the top to the bottom, a part of the upper part of the accommodating part 140 is in the space between the first core 210 and the second core 220. Separating requires a greater force than separating a portion of the lower portion in the space between the first core 210 and the second core 220. In the first step (S100), the second core 220 pushes up the upper surface 110 of the injection product 100 to partially replace the upper portion of the receiving part 140 with the first core 210 and the second core 220 ) In the space between.

If the fourth core 240 pushes up the side surface 120 of the injection product 100, a part of the upper part of the receiving part 140 is removed from the space between the first core 210 and the second core 220. If it is to be separated, there is a very high possibility of damage due to deformation occurring in the side surface 120 of the injection product. Therefore, in the first step, it is preferable that the second core 220 pushes up the upper surface 110 of the injection product 100.

In the first step S100, the fourth core 240 may move upward with respect to the second core 220. Strictly speaking, when the second core 220 moves upward, the fourth core 240 moves upward along the second core 220 together. In other words, at least a portion of the upper portion of the fourth core 240 is kept in contact with the protrusion 126, which is the lower end. In the first step (S100), the injection product 100 is upward with respect to the third core 23 Because it moves to, a space (S3) is formed between the lower surface of the hook portion 160 and the upper surface of the third core 230. In summary, the space (S3) is the hook portion 160 is deformed to form a mold It is a space to be separated from 200, and when the injection product 100 moves while the hook portion 160 is deformed, a sufficient space is provided so as not to be caught by the third core 230.

A second step in the method of manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIGS. 7 to 9.

7 is a cross-sectional view illustrating a deformation of a hook portion in a second step in a method of manufacturing an injection product according to an embodiment of the present invention, and FIG. 8 is a cross-sectional view showing a state in which the hook portion of FIG. 7 is fully opened. 9 is a cross-sectional view showing a state in which an injection product is completely separated from a first core and a second core.

Referring to FIG. 7, in the second step (S200) of moving the injection product 100 while the hook portion 160 is deformed, the fourth core 240 moves upward with respect to the second core 220, and the hook portion This is a step in which the injection product 100 moves upward with respect to the second core 220 as 160 is deformed.

That is, in the second step (S200), only the fourth core 240 moves upward, and the first core 210, the second core 220, and the third core 230 maintain their original positions.

Components of the injection product 100 that are separated or deformed according to the above are as follows.

First, the hook portion 160 is deformed to face downward. Specifically, referring to the detailed partial view of FIG. 7, the second hook portion 162 of the hook portion 160 is deformed to face downward.

At the same time, the wing portion 150 is separated from the wing groove 222.

At the same time, the threaded portion 130 is separated from the threaded groove 221.

At the same time, a portion of the lower portion of the receiving portion 140 that was not separated in the space between the first core 210 and the second core 220 in the first step (S100) is the first core 210 and the second core. It is separated in the space between 220.

Referring to FIG. 8, the hook portion is in a fully opened state as shown in FIG. 8 while only partially opened as shown in FIG. 7.

As described above, in the second step S200, only the fourth core 240 moves upward, and the first core 210, the second core 220, and the third core 230 maintain their original positions. The reasons for this are as follows.

In the first step (S100), the upper portion of the receiving portion 140 of the injection product 100 is already separated in the space between the first core 210 and the second core 220. Separating the upper part of the receiving part 140 of the injection product 100 in the space between the first core 210 and the second core 220 requires a large external force. Therefore, the deformation of the injection product 100 in this process In order to prevent the second core 220 from moving upward in the first step (S100) and pushing the upper edge 112 corresponding to the upper surface 110 upward, the receiving part 140 from the mold 200 The upper part of) was made to be separated smoothly.

Now, in the second step (S200), the hook portion 160 is deformed and separated, and the threaded portion 130 and the wing portion 150 are separated, which may require less external force than the first step S100. Therefore, in this process, the fourth core 240 may move upward to push up the side of the injection product 100 upward.

Referring to FIG. 9, the fourth core 240 further moves upward with respect to the first core 210 and the second core 220, thereby moving the injection product 100 upward. Accordingly, the injection product 100 is completely separated from the first core 210 and the second core 220.

A third step in the method for manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIG. 10.

10 is a cross-sectional view showing a third step in a method of manufacturing an injection product according to an embodiment of the present invention.

Referring to FIG. 10, in the step of separating the injection product 100 from the mold 200 (S400), the injection product 100 is completely separated from the mold 200 as shown in FIG. 10. At this time, the injection product 100 is separated while the hook unit 160 is fully extended downward, and the separated hook unit 160 returns to its original position as follows.

A fourth step in the method of manufacturing an injection product according to an embodiment of the present invention will be described with reference to FIG. 11.

11 is a partial detailed view showing area A of FIG. 2.

Referring to FIG. 11, the fifth step (S500) of restoring the hook part is a fourth step of deforming the hook part 160 to face the inside.

In more detail, after the third step (S300), the hook portion 160 faces downward and returns to its original position facing the inside only when the fourth step (S400) is reached.

According to the present invention, after forming a space between the lower surface of the hook portion and the upper surface of the third core, the first core is moved upward, thereby minimizing the deformation of the molded product, and allowing the injection product to be easily separated from the mold. .

In the above, embodiments of the method for manufacturing an injection product of the present invention have been described. The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and variations are possible from the perspective of those of ordinary skill in the field to which the present invention pertains. Therefore, the scope of the present invention should be defined by the claims of the present specification as well as those equivalent to the claims.

100: injection
110: upper surface
111: central upper surface
112: border top surface
120: side
121: upper side
122: lower side
123: cutout
125: cutout space
126: protrusion
130: threaded portion
140: receiving part
150: wing
160: hook portion
161: first hook portion
162: second hook portion
200: lower mold
210: first core
211: cooling pipe
220: second core
221: threaded groove
222: wing groove
223: hook coupling portion
230: third core
240: fourth core
250: slide core

Claims (26)

With the injection product attached to the mold,
The injection product,
Upper side;
A side surface extending downward from an edge of the upper surface;
A receiving portion located inside the side surface and extending downward from the upper surface; And
And a hook portion extending from the inside of the side surface and extending toward the inside,
The mold,
A first core having an upper portion positioned inside the receiving portion;
A second core surrounding the first core and having an upper portion between the receiving portion and the side surface;
A third core surrounding the second core and having at least a portion of an upper portion in contact with a lower surface of the hook portion; And
And a fourth core surrounding the third core, and at least a portion of the upper part in contact with the lower end of the side surface,
The second core moves upward with respect to the first core and the third core to form a space between the lower surface of the hook portion and the upper surface of the third core, and to separate the upper surface from the first core. The first step;
A second step of moving the fourth core upward with respect to the second core, so that the molded product moves upward with respect to the second core while the hook portion is deformed; And
A method of manufacturing an injection product comprising a third step of separating the injection product from the mold.
The method of claim 1,
In the above state,
The hook portion is a method of manufacturing an injection product positioned between the second core and the third core.
The method of claim 1,
In the above state,
Another part of the third core is a method of manufacturing an injection product in contact with the second core.
The method of claim 1,
In the state, the hook portion,
A first hook portion extending from an inner side of the side to an inner lower side; And
A method of manufacturing an injection product comprising a second hook part extending from the first hook part toward the inside.
The method of claim 4,
In the second step,
The second hook part is a method of manufacturing an injection product that is deformed to face downward.
The method of claim 1,
In the second step,
The method of manufacturing an injection product that is deformed so that the hook portion faces downward.
The method of claim 1,
In the first step,
The fourth core is a method of manufacturing an injection product that moves upward with respect to the third core.
The method of claim 1,
In the first step,
A method of manufacturing an injection product in which at least a portion of the upper part of the fourth core is kept in contact with the lower part.
The method of claim 1,
After the third step, the hook portion is facing downward,
The manufacturing method of the injection product further comprising a fourth step of deforming the hook portion toward the inside.
The method of claim 1,
The hook portion is a method of manufacturing an injection product that extends from different portions on the inner side of the side surface and is formed in a plurality of spaced apart from each other.
The method of claim 1,
The injection product further includes a wing portion positioned between the side surface and the receiving portion, and extending downward from the upper surface,
The second core includes a wing groove in which the wing portion is accommodated,
In the above state,
The wing part is a method of manufacturing an injection product accommodated in the wing groove.
The method of claim 11,
The method of manufacturing an injection product in which the thickness of the wing portion decreases from top to bottom.
The method of claim 11,
The wing portion is a method of manufacturing an injection product that extends shorter than the receiving portion.
The method of claim 11,
In the second step,
The method of manufacturing an injection product that is separated from the wing groove.
The method of claim 1,
A method of manufacturing an injection product in which the thickness of the receiving portion decreases from top to bottom.
The method of claim 1,
In the first step,
A part of the receiving part is separated in a space between the first core and the second core, and another part is accommodated in a space between the first core and the second core.
The method of claim 1,
The injection product further includes a threaded portion extending from the inside of the side surface,
The second core includes a threaded groove formed on the side,
In the above state,
The method of manufacturing an injection product in which the threaded portion is accommodated in the threaded groove.
The method of claim 17,
The method of manufacturing an injection product positioned above the threaded portion than the hook portion.
The method of claim 17,
In the second step,
The method of manufacturing an injection product in which the threaded portion is separated from the threaded groove.
The method of claim 1,
In the third step,
The fourth core is a method for manufacturing an injection product by pushing the lower end upwardly to move the injection product upward.
The method of claim 1,
The side,
Including an upper side and a lower side,
The upper side and the lower side are spaced apart from each other, and at least a portion of the injection molding method is connected by a cutout.
The method of claim 21,
The mold,
Further comprising a slide core positioned in the space between the upper side and the lower side,
The method of manufacturing an injection product further comprising a slide step in which the slide core is separated in the interspace.
The method of claim 22,
The slide step is a method of manufacturing an injection product performed before the first step.
The method of claim 1,
The injection product is made of polypropylene (PP: polypropylene), high density polyethylene (HDPE: High Density Polyethylene), low density polyethylene (LDPE: Low Density Polyethylene), and LLDPE: Liner Low Density Polyethylene) Way.

The method of claim 1,
The first core is a method of manufacturing an injection product including a cooling tube.
The method of claim 25,
At least a portion of the cooling pipe is in the above state, a method for manufacturing an injection product located in an inner space surrounded by the receiving portion.

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