KR20170027452A

KR20170027452A - Method for wrapping injection molding product in fabrics using Three-dimensional Overlay Method

Info

Publication number: KR20170027452A
Application number: KR1020150124075A
Authority: KR
Inventors: 황진호; 김세훈; 김재경; 김근하; 조성민
Original assignee: 현대자동차주식회사; 인탑스 주식회사
Priority date: 2015-09-02
Filing date: 2015-09-02
Publication date: 2017-03-10
Also published as: KR101755834B1

Abstract

The present invention relates to a method of wrapping a fabric on a surface of an injection mold using a TOM method.
The present invention realizes a new low-cost fabric wrapping method in which a fabric such as a suede / knit / nonwoven fabric is adhered to an injection product by applying a TOM method and then the fabric is entirely wrapped to the overlay portion of the injection end through a special film, And a fabrication method that uses the TOM method to secure the quality due to the high quality of the product as well as the manufacturing cost reduction.

Description

[0001] The present invention relates to a three-dimensional overlay method using a TOM method,

The present invention relates to a fabric wrapping method using a TOM method, and more particularly, to a method of wrapping a fabric on a surface of an injection molded article using a TOM method.

Generally, a case constituting the surface of various electric and electronic devices, a communication device such as a cellular phone, a mirror for a vehicle, etc. is made of an injection molded product of a synthetic resin, and such a case is usually surface-treated by various methods.

For example, a metal layer may be formed on the surface of a synthetic resin film in such a manner as to have a metallic luster texture on the surface of the case or to realize aesthetic effect such as three-dimensional feeling or to express the texture of a soft fabric during case manufacturing, A method of inserting and inserting inserts, or wrapping the surface of the molded article case with a fabric is used.

However, most of these methods have disadvantages such as complicated processes, time-consuming work, and high cost.

Therefore, recently, by applying TOM method (Three-dimensional Overlay Method), which is a method of forming a vacuum environment and blowing atmospheric pressure, a film or a fabric is attached and formed on the surface of an injection molded article used for automobile interior and exterior materials, And the method of closing it is mainly used.

For example, in the TOM method, a film having a pattern for exterior decoration is preheated, and the film is placed on an injection mold, and the thus seated film is adhered to cover the overlapped portion of the injection product by vacuum and pressurization. A method of manufacturing a product in which the surface of an injection molded article is wrapped with a film.

Such a TOM method can cover the film to the undercut portion of the injection molding, and the appearance can be obtained because no appearance burr occurs. However, since the film serves as a decoration, There is a limitation that it is difficult to apply to a deep drawing part such as a pattern may be broken.

Korean Patent Publication No. 10-2011-0101165 United States Patent US 7232541

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for applying a TOM method to a fabric, such as a suede / knit / nonwoven fabric, It is an object of the present invention to provide a fabric wrapping method using a TOM method which can achieve a quality according to a product quality as well as a process simplification and a manufacturing cost reduction by implementing a new low cost fabric wrapping method.

In order to accomplish the above object, the present invention provides a fabric wrapping method using the TOM method, which has the following features.

In the method of fabricating the TOM using the TOM method, the fabric is cut according to the shape of the injection material, the fabric is placed on the injection material, and the fabric is preheated through the preheating. A vacuum is formed inside the vacuum chamber, and a vacuum is applied to the inside of the vacuum chamber to pressurize the film so that the film is in close contact with the injection side by the vacuum pressure at this time, And a step of opening the vacuum chamber to take out a product in which the fabric is wrapped around the injection product.

In this case, when the cut fabric is positioned on the injection molding, the position of the fabric can be positioned on the injection molding using the fixing jig, and the position of the fabric can be determined by fitting the guide hole in the fabric at the pin in the fixing jig You can make it catch.

Further, after the product is taken out, a process of preventing lifting by pressing a corner portion of the product using a press-in jig in a post-processing operation can be further performed.

In the case of the above fabric, suede, high density tricot, knit, nonwoven fabric or the like can be used. In the case of the above-mentioned film, any material having a stretchability such as a CPP film and not allowing air to pass therethrough can be used .

The fabric wrapping method using the TOM method provided by the present invention has the following effects.

Firstly, it is possible to prevent exposing the end of the fabric compared to the back injection or other methods, and it is possible to apply to the deep drawing area where the outer decoration pattern is not awkward even when the fabric is stretched due to the elongation of the fabric itself, have.

Second, there is an advantage that the surface can be upgraded compared to the existing flocking specification and the end burr can be eliminated compared with the back injection method.

Third, the overall process is simple, and the cost can be reduced.

Fourth, by wrapping the suede fabric on the surface of the interior material such as the rear mirror case and the housing installed in the head lining, it is possible to improve the quality of the surface treatment compared with the existing flocking treatment and use the same fabric as the head lining fabric It is possible to improve the sense of heterogeneity.

1 is a schematic view showing an entire process of a fabric wrapping method using a TOM method according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a far-end trimming process in a fabric wrapping method using a TOM method according to an embodiment of the present invention.
FIG. 3 is a schematic view showing a process for attaching a vacuum film in a fabric wrapping method using a TOM method according to an embodiment of the present invention.
4 is a schematic view showing a vacuum molding process in a raw material wrapping method using a TOM method according to an embodiment of the present invention.
5 is a schematic view showing a post-treatment process in a fabric wrapping method using a TOM method according to an embodiment of the present invention.
FIG. 6 is a schematic view showing a case and a housing manufactured by a fabric wrapping method using a TOM method according to an embodiment of the present invention.

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

FIG. 1 is a schematic view showing an entire process of a fabric wrapping method using a TOM method according to an embodiment of the present invention.

As shown in FIG. 1, the fabric wrapping method using the TOM method is a low-cost, high-efficiency method in which a fabric is adhered to an injection object by applying a TOM method and then wrapped around a terminal overlay portion through a special film. And a process for ensuring the quality of the product.

First, a step of cutting the fabric 10 coated with an adhesive according to the shape of the injection product 11 is performed.

An adhesive such as hot melt is laminated on one side of the fabric 10, and the fabric 10 is cut to fit the contour of the mold through the Thomson jig.

For example, as shown in Fig. 2, the outer shape of the raw fabric 10 is cut by using a trimming jig, and then a hot-melt film for adhering the molded product is attached to the rear surface.

Here, the trimming shape can be basically set in consideration of vacuum.

As the material of the fabric 10, materials such as suede, high density tricot, knit, nonwoven fabric and the like can be used.

Next, the cut fabric 10 is placed on the prepared injection product 11, and then the fabric 10 is adhered through preheating.

That is, the fabric 10 is placed on the injection product 11 and preheated, and the hot melt film is melted through the preheating, so that the fabric 10 can be pressed onto the injection product.

When the cut 10 is positioned on the injection object 11, the position of the material 10 corresponding to the shape of the injection object 11 can be accurately positioned on the injection object 11 using the positioning jig 15.

For this, a guide hole 16 may be formed in at least four positions in front and back and at left and right positions on the fabric 10, and the hole 16 of the fabric 10 is protruded from the seating jig 15 for preheating The fingers 18 are inserted into the fins 18 formed in advance in consideration of the shapes of the fingers 10 and the molded article 11 so as to regulate the position of the fingers, It is possible to set the position of the fabric 10 accurately.

Next, the step of setting the injection molded article 11 to which the fabric 10 is adhered, together with the film 12, in the vacuum chamber 13 and then closing the vacuum chamber 13 is carried out.

That is, the vacuum pressurized condition is realized in a state in which the injection object 11 to which the preheated raw material 10 is adhered is placed on the vacuum jig 19 and then clamped by the film 12.

That is, as shown in Fig. 3, there is provided a vacuum chamber 13 in which a vacuum jig 19 for seating an injection molded article is provided, and a hole for pumping bubbles is formed downward, 13 is set, and the upper side thereof is covered with the film 12.

At this time, when the vacuum chamber 13 is closed, four sides of the film 12 can be pressed and fixed to the chamber side.

Here, the film 12 may be a CPP film, and the CPP film at this time may not be stretched by the PP film produced by the T-DIE method, and may be stretched in both directions.

In other words, since suede and knitted nonwoven fabrics have fine pores in the fabric itself, unlike the film type, vacuum conditions can not be directly implemented, and a vacuum condition can be implemented using a CPP film instead.

The film 12 acts as a tool for attaching the fabric 10 to the injection product 11 by vacuum and pressurization, and the film 12 at this time is removed after attaching the fabric.

Of course, the material of the film 12 may be any material other than the CPP film, which is elongated and does not pass air.

A vacuum is created inside the vacuum chamber 13 and the fabric 10 is pressed against the injection mold 11 by pressing the raw fabric 10 to be in close contact with the injection mold 11 side by the vacuum pressure at this time, So as to be adhered to the surface of the substrate.

4, in a state in which the injection molding 11, to which the fabric 10 is adhered, is injected onto the vacuum jig 19 of the vacuum chamber 13, a vacuum pump (not shown) ), Vacuum is implemented inside the chamber.

At this time, it is preferable to apply nitrogen gas or the like to the upper side of the film so that the pressing condition is realized in addition to the vacuum condition.

When a vacuum is formed inside the vacuum chamber 13, that is, a vacuum is formed in the lower space of the film in the chamber, the film 12 is slowly pressed to the lower end while pressing the fabric 10 from the upper end, The raw material 10 is adhered to the entire surface of the injection product 11 as well as to the overlay portion by the pressurization through the pressurizing member 12.

Here, the vacuum pressure in the vacuum chamber 13, the vacuum forming time, and the like can be appropriately set in advance through several calibrations for various types of products.

Next, after the product 14 is taken out, a process of preventing lifting by pressing the corner portion of the product 14 using the press-in jig 17 in the post-processing operation can be performed.

That is, as shown in Fig. 5, the removed product 14 is subjected to a post-treatment operation by using the press-fitting jig 17. Fig.

Usually, the corners of the fabric have a structure in which the difference in elongation and the depth of attachment are so deep that the adhesive strength tends to deteriorate.

In order to prevent this, it is possible to prevent lifting by pressing the corner portion by using the press-fitting jig (17).

Next, after about 60 to 80 seconds, the vacuum chamber 13 is opened to take out the product 14 in which the fabric 10 is wrapped around the injection product 11.

That is, when the product 14 is taken out of the vacuum chamber 13 and then the film 12 is removed, the brushed / surface of the fabric is alive and the end portion is also completely wrapped, so that burrs of the flange portion do not occur.

FIG. 6 shows a casing and a housing of a rear mirror for a vehicle, which is wrapped with a suede fabric. The fabric 10 is attached to the corner portion and the entire surface as well as the overlay portion. I can see that it is wrapped without excitement.

The case and the housing of such a rear mirror for a vehicle are manufactured in the form of being wrapped with a suede fabric so that the surface treatment can be advanced and the quality of the surface treatment can be improved as compared with the conventional plucking treatment. The same fabric can be used to eliminate the sense of heterogeneity.

In addition, it is possible to solve the problem that burrs are generated at the end when the back injection method is applied after the fabric insert as in the past, and the cost can be saved as compared with the plugging specification.

As described above, in the present invention, in order to improve the reduction of the lowering due to the exposure of the casing and the housing of the product used as a vehicle interior material, for example, a rear view mirror, the case and the housing are wrapped with a suede fabric, By implementing this, it is possible to enhance the surface treatment of the product with simple process and low cost, and by covering the overlay area with vacuum / pressurization of the special film using TOM method, .

10: Fabric
11: Injection
12: Film
13: Vacuum chamber
14: Products
15: seat jig
16: Guide hole
17: press-in jig
18: pin
19: Vacuum Jig (Vacuum Jig)

Claims

Cutting the fabric 10 to which the adhesive is applied to fit the shape of the injection mold 11;
Placing the cut fabric (10) on the injection product (11) and then gluing the fabric (10) through preheating;
Setting an injection material (11) to which the fabric (10) is adhered in the vacuum chamber (13) together with the film (12) and then closing the vacuum chamber (13);
A vacuum is created inside the vacuum chamber 13 and the film 10 is pressed against the surface of the article 11 by the vacuum pressure at this time so that the article 10 is pressed against the surface of the article 11 To be adhered to the substrate;
Opening the vacuum chamber 13 to take out the product 14 in which the fabric 10 is wrapped around the injection product 11;
Wherein the TOM method is applied to the fabric wrapping method.

The method according to claim 1,
And the position of the fabric 10 is held on the injection product 11 by using the positioning jig 15 when the cut fabric 10 is placed on the injection product 11. [ .

The method of claim 2,
The positioning of the cut fabric 10 in the manner of fitting the guide hole 16 in the fabric 10 to the fins in the seating jig 15 when positioning the cut end 10 in the injection product 11 Fabric Wrapping Method.

The method according to claim 1,
Further comprising a step of pressing the corners of the product (14) using a press-in jig (17) in a post-processing operation after the product (14) is taken out to prevent lifting of the product (14) Wrapping method.

The method according to any one of claims 1 to 4,
The fabric 10 may be fabricated from any one of suede, high density tricot, knit, and nonwoven fabrics.

The method according to any one of claims 1 to 4,
Wherein the film (12) is a CPP film.