KR20110058179A - Injection molding product and method for manufacturing the same - Google Patents

Abstract

PURPOSE: An injection molded product and a manufacturing method thereof are provided to improve the strength of the injection molded product and to shield electromagnetic waves by inserting a metallic yarn woven material into the injection molded product. CONSTITUTION: An injection molded product(1) comprises a base material(10) and a metallic yarn woven material(20). The base material is made of plastic resin and forms the outer shape of the injection molded product. The metallic yarn woven material is insert-molded in the base material. The plastic resin is guided to the perforated surface of the metallic yarn woven material through one or more through holes(20A) so that the plastic resin can be coupled to the metallic yarn woven material.

Description

Injection molding product and method for manufacturing the same

The present invention relates to an injection molded article and a method for manufacturing the same, and more particularly, to an injection molded article and a method for manufacturing the same that can ensure the rigidity of the injection molded article, as well as increase the degree of freedom of choice for the plastic resin. .

In the case of electronic products, rigidity is required for exterior injection molded parts to protect internal components. General methods for securing rigidity in injection molded articles include increasing the thickness of injection molded articles to reinforce the rigidity, reinforce the rigidity using a plastic resin reinforced with filler such as glass fiber, or insert a metal sheet to provide rigidity. There is a way to reinforce.

However, there is a problem that the method of increasing the thickness of the injection molded article not only increases the material cost but also is not suitable for the trend of requiring a thinned product.

In addition, the method of using a plastic resin reinforced with a filler such as glass fiber not only increases the material cost but also has a problem in performing the coating treatment.

In addition, a method of inserting and injecting a metal sheet has a problem in that an injection molded product is warped due to a difference in thermal expansion coefficient between the plastic resin and the metal sheet, thereby limiting the available plastic resin.

One aspect of the present invention relates to an injection molded article capable of securing rigidity of the injection molded article and increasing a degree of freedom of selection for the plastic resin and a method of manufacturing the same.

Another aspect of the present invention relates to an injection molded article capable of shielding electromagnetic waves by inserting a metal yarn woven fabric into an injection molded article, and a method of manufacturing the same.

An injection molded article according to an embodiment of the present invention is characterized in that it comprises a substrate for forming the appearance of the injection molded article, and a metal yarn woven insert-molded on the substrate.

In addition, the substrate is characterized by consisting of a plastic resin.

In addition, the metal yarn woven fabric is provided with at least one through hole for guiding the plastic resin to the through surface of the metal yarn woven fabric so that the plastic resin and the metal yarn woven fabric can be combined during injection molding.

In addition, the through hole is characterized in that it is selectively formed according to the shielding and transmission of electromagnetic waves.

In addition, the plastic resin is characterized by comprising at least one of opaque resin, translucent resin, transparent resin.

In addition, the metal yarn woven fabric is characterized in that a plurality of metal yarns are woven in the form of a net.

In addition, the metal yarn woven fabric is coated with a polymer resin through an electrodeposition coating, characterized in that the resin injection molding space is set in the mold formed.

In addition, the metal yarn woven fabric is characterized in that the fusion between the metal yarns by applying a predetermined pressure and temperature is set in the mold in which the resin injection molding space is formed.

In addition, the metal yarn woven fabric is heat-pressed on the film and is characterized in that the resin injection molding space is set in the mold is formed.

In another aspect, the injection molded article according to an embodiment of the present invention, in the injection molded article comprising a first plastic resin for forming the appearance of the injection molded article, and an insert molded insert is inserted into the first plastic resin, the insert molding is The surface is electrodeposited and coated with a polymer resin of the same quality as the first plastic resin, and then the injection molding is performed in a mold in which a resin injection molding space is formed.

In addition, the insert moldings are characterized in that they comprise a metal yarn woven.

In addition, the insert molding is characterized in that it is provided with at least one through-hole for guiding the first plastic resin flows into the insert molding during injection molding.

According to another aspect of the present invention, an injection molded article according to an embodiment of the present invention, in an injection molded article including a metal yarn woven fabric, the metal yarn woven fabric forming the insert molding and the insert molding are predetermined in a state where the insert molding is inserted into the mold. It includes a plastic resin bonded to both surfaces of the metal yarn woven fabric to be injection molded in the shape of, wherein the metal yarn woven fabric is formed with at least one through hole for guiding the plastic resin bonded through the inside of the metal yarn woven fabric during injection molding It is characterized by that.

In the method for manufacturing an injection molded article according to an embodiment of the present invention, the method for manufacturing an injection molded article, comprising the steps of preparing a metal yarn woven fabric, forming a through-hole in the metal yarn woven fabric to form an insert molding, the insert molding is hot Fixing the insert molding to withstand the high-pressure injection process, setting the insert molding in a mold having a predetermined resin injection molding space so as to contact the plastic resin into which the metal yarn woven material is injected, and the resin injection molding space of the mold Injection molding the plastic resin to form a substrate made of a plastic resin, and the step of taking out the injection-molded injection molded article from the mold.

In addition, the step of fixing the insert molding is characterized in that it comprises the step of coating a polymer resin on both surfaces of the insert molding.

In addition, the step of fixing the insert molding is characterized in that it comprises the step of fusion between metal yarns by applying a constant pressure and temperature to the insert molding.

In addition, the step of securing the insert moldings is characterized in that it comprises the step of heat pressing the insert moldings on the film.

In addition, after fixing the insert molding, cutting the insert molding to a predetermined size cutting step, molding the insert molding into a predetermined shape, characterized in that it further comprises the step of washing the insert molding.

According to another aspect of the method for manufacturing an injection molded article according to an embodiment of the present invention, in the method for manufacturing an insert injection molded article, the method may include preparing an insert molding, and applying electrodeposition coating so that the insert molding may withstand high temperature and high pressure injection processes. Fixing the insert molding through the insert, setting the insert molding in a mold having a predetermined resin injection molding space so as to contact the plastic resin into which the metal yarn woven material is injected, and plastic resin by injecting the plastic resin into the resin injection molding space of the mold Insert injection molding to form a substrate consisting of, and the insert-molded injection molded article is characterized in that it comprises a step of taking out from the mold.

In addition, the insert moldings are characterized in that they comprise a metal yarn woven.

Therefore, the injection molded article and the method of manufacturing the same according to the present invention can not only secure the rigidity of the injection molded article, but also have an effect of increasing the degree of freedom of selection for the plastic resin.

In addition, there is an effect that can shield the electromagnetic wave by inserting a woven metal yarn in the injection molded article.

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

1 is a view showing a plastic injection molded article according to an embodiment of the present invention, Figure 2 is an enlarged view showing an insert molding according to an embodiment of the present invention, Figure 3 is a cross-sectional view according to III-III 'of FIG. to be.

As shown in Figures 1 to 3, the injection molded article 1 according to an embodiment of the present invention is a base 10 to form the appearance of the injection molded article 1, and is inserted into the base 10 to the injection molded article ( It is configured to include an insert molding 20 to reinforce the rigidity of 1).

The substrate 10 may be made of a plastic resin. The plastic resin may include a transparent resin, an opaque resin, and a translucent resin.

The base 10 is prepared by injecting and molding a molten plastic resin into a predetermined resin injection molding space provided in a mold (not shown).

The insert molding 20 may be insert molded into the substrate 10 by injecting a plastic resin into a resin injection molding space of a mold (not shown). The insert molding 20 may include a metal yarn woven fabric 20.

The metal yarn woven fabric 20 may be injection molded into a predetermined shape in a state of being set in a mold (not shown). The metal yarn woven fabric 20 shields electromagnetic waves transmitted to the inside of the substrate 10. You can do it.

The metal yarn woven fabric 20 is provided with a through hole 20A to induce plastic resin upon injection molding into the metal yarn woven fabric 20 so that the bonding force between the substrate 20 and the metal yarn woven fabric 20 can be improved. .

Since shielding and transmission of electromagnetic waves are determined according to the shape of the through hole 20A, the through hole 20A in the metal yarn woven material 20 may be manufactured in a shape suitable for the metal yarn woven material 20 so as to match the electromagnetic shielding characteristics. Of course it can.

As the metal yarn woven fabric 20 is shown in FIG. 2, the metal yarns 21 and 22 may be woven in a mesh form. The metal yarns 21 and 22 include a first metal yarn 21 arranged in a first direction and a second metal yarn 22 arranged in a second direction.

The metal yarns 21 and 22 are formed of a single material of metals such as copper, gold, silver, zinc and tin, or a mixture of two or more materials, or stainless steel including carbide metal such as tungsten, titanium, molybdenum, tantalum or cobalt. It may include.

In addition, the metal yarns 21 and 22 may be provided in units of several millimeters to several millimeters to form the metal yarn woven fabric 20.

However, although the metal yarn woven fabric 20 is formed of only the metal yarns 21 and 22, the metal yarn woven fabric 20 is woven into the mesh form of the metal yarns 21 and 22 and a synthetic resin yarn (not shown). It may be formed. That is, the metal yarn woven fabric 20 may be woven by replacing at least one of the first metal yarn 21 or the second metal yarn 22 with synthetic resin yarns (not shown).

Since the metal yarn woven fabric 20 can be put into various designs according to the method of weaving, even when the transparent resin is injected, the metal yarn woven fabric 20 can improve the quality of the injection molded product 1 while maintaining the texture of the metal yarn woven fabric 20.

Therefore, since the injection molded article 1 according to the embodiment of the present invention is applicable to not only the opaque resin and the translucent resin but also the transparent resin, there is an effect of increasing the freedom of selection for the plastic resin.

The metal yarn woven fabric 20 should be fixed to withstand the injection process of high temperature and high pressure. Referring to FIGS. 4 to 7, the metal yarn woven material 20 can withstand the injection process of high temperature and high pressure. Look at how to fix (20).

Figure 4 is a view showing a method of fixing a metal yarn woven fabric according to an embodiment of the present invention, Figures 5 and 6 is a view showing a method of fixing a metal yarn woven fabric according to another embodiment of the present invention, 7 and 8 are views showing a method for fixing a metal yarn woven fabric according to another embodiment of the present invention.

First, as shown in FIG. 4, both surfaces of the metal yarn weave 20 may be coated with a polymer resin to fix the metal yarn weave 20. The coating method of the metal yarn woven fabric 20 with a polymer resin may be applied to various coating methods.

For example, the coating may be performed to form a film on both surfaces of the metal yarn woven material 20 with the polymer resin 30 for coating through electro-deposition coating.

Electrodeposition refers to a phenomenon in which a cation particle in a solution moves to a cathode and an anion particle moves to a cathode when an electric current flows through the solution. The electrophoresis is applied to a coating.

That is, the metal yarn woven fabric 20 is placed in a bath (not shown) containing the polymer resin 30 for coating dispersed or dissolved in water, and a voltage is applied between the metal yarn woven fabric 20 and the electrode (not shown). When the current flows, electrophoresis, electrocoagulation, electropenetration, electrolysis, and the like may occur to uniformly form a film with the coating polymer resin 30 on both surfaces of the metal yarn woven material 20.

Since the electrodeposition coating is coated only on both surfaces of the metal yarn woven fabric 20, even when the through-hole 20A is formed in the metal yarn woven fabric 20, the metal yarn woven fabric 20 is resin injection molding space without additional post processing. It is possible to proceed with the injection process by setting in the formed mold (not shown).

In addition, the metal yarn woven fabric 20 fixed through electrodeposition coating has an effect of easily bonding the injection plastic resin and the coating polymer resin 30 in the injection process.

Because the metal yarn woven fabric 20 is made of an injection plastic resin and a release material, the substrate 10 of the injection molded product 1 may be peeled off due to the difference in the coefficient of thermal expansion in the injection process. This problem can be solved by forming a coating polymer resin 30 on both surfaces and then injecting a homogeneous injection plastic resin.

On the other hand, in the method of coating the metal yarn woven fabric 20 with a polymer resin, the polymer resin 30 for coating the metal yarn woven fabric 20 is sprayed by spraying paint by spraying paint with the force of compressed air. ) May be coated.

Next, as illustrated in FIGS. 5 and 6, the metal yarn weave 20 may be fixed by applying a constant pressure and temperature to the metal yarn weave 20 through a high temperature and high pressure heating device 40.

That is, the metal yarn woven fabric 20 includes the first and second metal yarns because the first metal yarns 21 arranged in the first direction and the second metal yarns 22 arranged in the second direction are woven in a mesh form. There is a contact between the (21, 22), so if there is a contact between the first and second metal yarn (21, 22) because the fusion may occur under a certain temperature and pressure, the metal yarn weave 20 through this To be fixed.

Next, as illustrated in FIGS. 7 and 8, the metal yarn woven fabric 20 may be hot-pressed on the film 50 to fix the metal yarn woven fabric 20.

That is, when the metal yarn woven fabric 20 is heat-compressed on the film 50 to produce a sheet into which the metal yarn woven fabric 20 is inserted, the metal yarn woven fabric 20 may be fixed by heat compression.

Next, a method of manufacturing an injection molded article according to an embodiment of the present invention will be described with reference to FIG. 9. 9 is a flowchart of a method of manufacturing an injection molded article according to the present invention.

First, the metal yarn woven material 20 formed by weaving the metal yarns 21 and 22 is provided (S10).

Next, a through hole 20A is formed in the metal yarn woven material 20 to form the insert molding 20 (S20). The through hole 20A serves to guide the plastic resin injected into the metal yarn weave 20 to flow to the center portion of the metal yarn weave 20.

Thus, the plastic resin forming the substrate 10 is applied through the metal yarn woven material 20 through the through holes 20A as well as both surfaces of the metal yarn woven material 20 after injection molding, so that the substrate 10 and the metal are applied. It is possible to improve the bonding force of the yarn weave 20.

Next, the insert molding 20 is fixed to withstand the injection process at high temperature and high pressure. (S30) The method of fixing the insert molding 20 coats both surfaces of the insert molding 20 or insert molding 20 ) May be used to heat-compress the film 50 or to fix the insert molding 20 through bonding.

Next, after the insert molding 20 is formed, a cutting process for cutting the insert molding 20 to a predetermined size is performed, for example, a blanking process (S40).

After blanking the insert molding 20, the blanking insert molding 20 is formed into a predetermined shape by using a forming machine (not shown) (S50).

Then, the insert molding 20 is washed to remove the foreign matter attached to the molded insert molding 20 (S60).

Meanwhile, in some cases, the injection process may be performed in a state in which the blanking process (S40), the forming process (S50), and the washing process (S60) are omitted.

After washing the insert molding 20, the washed insert molding 20 is set in a mold in which a predetermined resin injection molding space is formed (S70).

Subsequently, the plastic resin is injected into the resin injection molding space of the mold (not shown) to form the substrate 10, and the insert molding 20 is insert molded to the substrate 10 (S80).

At this time, the plastic resin injected into the resin injection molding space of the mold is in close contact with both surfaces of the metal yarn woven fabric 20, and some plastic resin is adhered to the metal yarn through the through hole 20A of the metal yarn woven fabric 20. It is applied through the woven fabric 20 to improve the bonding force between the base material 10 and the metal yarn woven material 20, as well as the metal yarn woven material 20 is insert molded into the base material 10.

Then, the insert-molded injection molded article 1 is taken out from the mold (S90), and the manufacture of the injection molded article 1 according to the present invention is completed.

In this way, the base 10 and the metal yarn woven fabric 20 made of a plastic resin may be provided to insert insert the metal yarn woven fabric 20 into the base 10, and the injection molded article ( In addition to ensuring the rigidity of 1), there is an effect that can shield the electromagnetic waves.

As described above, the injection molded article and the method of manufacturing the same according to an embodiment of the present invention, as well as to ensure the rigidity of the injection molded article, and to make it possible to increase the degree of freedom of choice for plastic resin as a basic technical idea It can be seen. Therefore, many modifications may be made by those skilled in the art without departing from the scope and spirit of the present invention.

1 is a view showing a plastic injection molded article according to an embodiment of the present invention.

2 is an enlarged view of an insert molding according to an embodiment of the present invention.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

4 is a view showing a method of fixing a metal yarn woven fabric according to an embodiment of the present invention.

5 and 6 are views showing a method of fixing a metal yarn woven fabric according to another embodiment of the present invention.

7 and 8 are views showing a method of fixing a metal yarn woven fabric according to another embodiment of the present invention.

9 is a flowchart of a method of manufacturing an injection molded article according to the present invention.

Description of the Related Art [0002]

1. Injection molded products 10 ...

20 ... Insert molding 20A .. Through hole

30 ... Coating polymer resin 40 ... High temperature, high pressure heating device

50 ... film

Claims (20)

A base material forming the appearance of the injection molded article, Injection molded article comprising a metal yarn woven insert-molded on the substrate. The method of claim 1, The base material is an injection molded article, characterized in that made of a plastic resin. The method of claim 2, The metal yarn woven fabric is provided with at least one through hole for guiding the plastic resin to the through surface of the metal yarn woven fabric so that the plastic resin and the metal yarn woven fabric can be bonded during the injection molding. The method of claim 3, The through hole is an injection molded article, characterized in that formed selectively depending on the shielding and transmission of electromagnetic waves. The method of claim 2, The plastic resin is an injection molded article comprising at least one of opaque resin, translucent resin, transparent resin. The method of claim 1, The metal yarn woven fabric is injection molded product, characterized in that a plurality of metal yarns are woven in the form of a net. The method of claim 1, The metal yarn woven fabric is coated with a polymer resin through an electrodeposition coating, and then injection molded article, characterized in that the resin injection molding space is set in the mold. The method of claim 1, The metal yarn woven fabric is injected into the metal yarn by applying a predetermined pressure and temperature, and then injection molded article, characterized in that the resin injection molding space is set in the mold formed. The method of claim 1, The metal yarn woven fabric is heat-compressed on a film and then set in a mold in which a resin injection molding space is formed. An injection molded article comprising a first plastic resin for forming an appearance of an injection molded article and an insert molded article inserted into the first plastic resin, The insert molding is injection molded product, characterized in that the surface is electrodeposited with a polymer resin of the same quality as the first plastic resin and then injection molded by setting in a mold having a resin injection molding space. The method of claim 10, The insert molding is injection molded article, characterized in that it comprises a metal yarn woven. The method of claim 10, The insert molding is injection molded article, characterized in that provided with at least one through-hole for guiding the first plastic resin flows into the insert molding during injection molding. In the injection molded article containing a metal yarn weave, A metal yarn woven fabric forming an insert molding, It includes a plastic resin bonded to both surfaces of the metal yarn woven fabric such that the insert molding is injection-molded in a predetermined shape in the insert (insert) state, And at least one through-hole formed in the metal yarn woven fabric to guide the plastic resin to be bonded through the inside of the metal yarn woven fabric during injection molding. In the manufacturing method of the insert injection molded article, Preparing a metal yarn woven fabric; Forming an insert molding by forming a through hole in the metal yarn woven fabric; Fixing the insert molding so that the insert molding can withstand a high temperature and high pressure injection process; Setting the insert molding in a mold in which a predetermined resin injection molding space is formed such that the metal yarn woven material contacts the plastic resin to be injected; Insert injection molding to inject the plastic resin into the resin injection molding space of the mold to form a substrate made of a plastic resin; And And extracting the insert-molded injection molded article from the mold. The method of claim 14, Fixing the insert molding is a method of manufacturing an injection molded article comprising the step of coating a polymer resin on both surfaces of the insert molding. The method of claim 14, Fixing the insert molding is a method of manufacturing an injection molded article comprising the step of fusion between metal yarns by applying a constant pressure and temperature to the insert molding. The method of claim 14, The fixing of the insert molding includes manufacturing the insert molding by heat pressing the film on a film. The method of claim 14, Fixing the insert molding and cutting the insert molding to a predetermined size; Molding the insert molding into a predetermined shape; Method for producing an injection molded article, characterized in that it further comprises the step of washing the insert molding. In the manufacturing method of the insert injection molded article, Preparing an insert molding; Fixing the insert molding through electrodeposition coating so that the insert molding can withstand a high temperature and high pressure injection process; Setting the insert molding in a mold in which a predetermined resin injection molding space is formed such that the metal yarn woven material contacts the plastic resin to be injected; Insert injection molding to inject the plastic resin into the resin injection molding space of the mold to form a substrate made of a plastic resin; And And extracting the insert-molded injection molded article from the mold. The method of claim 19, The insert molding is a method for producing an injection molded article, characterized in that it comprises a metal yarn woven.

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