KR20090128218A - Method and apparatus for manufacturing window module for lcd having metal molding - Google Patents

Abstract

PURPOSE: A manufacturing method and a manufacturing apparatus of an LCD(Liquid Crystal Display) window module having a metal molding are provided to prevent scratches in the surface of the metal molding with a heat-resistant surface protection member, thereby reducing the failure rate of products. CONSTITUTION: A surface protection member(50) is formed in the part in which a metal molding(30) is placed in the inside of a lower mold(20). Adhesive is spread in the contact portion of the injection product of the metal molding. The external surface of the metal molding is placed while facing the surface protection member in the lower mold. A resin solution is supplied from the runner(11) of an upper mold(10). The resin solution is injected to the combined part of the upper and lower molds. When the resin solution hardens in the adhesive spreading part of the metal molding, the upper mold and the lower mold are separated. An injection frame bonded on the metal molding is extracted from the lower mold.

Description

Method for manufacturing window module for LCD having metal molding and apparatus for manufacturing the same {Method and apparatus for manufacturing window module for LCD having metal molding}

The present invention relates to a window module that protects an LCD (LCD) used as a display of various electronic devices and is used as an external finishing material of the electronic device. In particular, in injection molding an injection frame having a metal molding, While the resin is provided through the direct runner from the upper mold, the lower mold in contact with the metal molding is formed by attaching a surface protective material, thereby reducing the production speed as well as the interference between the mold and the metal molding as compared with the conventional window module manufacturing method. It is possible to prevent the surface scratches caused by the productivity, as well as to significantly reduce the failure rate, it is possible to produce window modules of different sizes at the same time.

BACKGROUND With the high industrialization, various electronic devices are widely used as means of communication between individuals and information exchange between individuals and specific or unspecific objects.

Representative examples of such electronic devices include personal mobile phones, PDAs, MP3, PMPs, portable game consoles, navigation devices, digital cameras, and the like. These various electronic devices include key buttons and display means, which are input means for communicating with users. In LCD (LCD) is provided, respectively.

In particular, in recent years, as the technology of the touchpad that can input through the display is radically developed, a window molding made of metal molding and polycarbonate material for protecting the output means LCD is being developed at the same time. .

The window module having the metal molding allows the molding of the metallic resin window coupled with the metal molding while the metal molding allows the expressive durability of the device and expresses the beautiful colors and textures unique to the metal. While protecting, it has a high degree of transparency so that users can clearly see the output from LCD.

As a general method for manufacturing such an LCD module, a separate window made of acrylic or polycarbonate, a metal molding for fixing the window and a synthetic resin material for fastening to the body of various electronic devices Each of the injection-molded product is formed, and the upper surface of the window is produced by attaching and forming a film member printed on the product name or manufacturer of the electronic device or the characteristic contents, the design and the logo.

Accordingly, each of these components is attached to form a single window module. First, separate injection moldings are adhered to the bottom of the metal molding to form an adhesive layer on the bottom surface of the metal molding.

In this state, when the adhesive layer is formed on the upper jaw portion of the upper part of the metal molding again, and the window is attached using the adhesive layer, the window module having the outer metal molding is completed.

However, in the window module obtained by the manufacturing method as described above, the bending corner portion is not formed at right angles in the process of pressing a metal panel to form a predetermined molding, and the round is formed by bending the metal material. As there is a problem, the rounding part acts as a cause of causing a gap with the window seated inward, so that dust or foreign matter is trapped in the gap and thus looks very messy in appearance but is not good for hygiene. In the case of coloring or discoloration, the appearance is greatly deteriorated.

That is, the metal molding is bent to form a window and bonded to the inside of the metal molding. Even though the seating part of the metal molding and the size of the window are precisely controlled and assembled, the bending part of the metal molding is bent by bending the metal plate. Since the inevitably formed rounding parts are formed, a gap corresponding to these rounding parts is inevitably occurring over almost all parts irrespective of the precision molding of each component.

Accordingly, the bottom edge of the window additionally forms a dark printing part such as black, thereby visually misunderstanding the messy appearance caused by the foreign matter accumulated in the gap by the printing edge, thereby making the appearance of dust as described above. However, this is only a non-measure using visual misconceptions of consumers, which is not a fundamental solution, and when the contaminants of color differentiated from the printing unit are accumulated, the contaminants are rather adversely affected. Will be done.

In addition, the method of manufacturing a window module having a metal molding as described above is a method of manufacturing the film member, the window, the metal molding, and the injection molding by adhering them to each other in a state in which they are manufactured separately, thus making the manufacturing process complicated and many steps. There is a hassle to go through.

In particular, in order to have each component, the corresponding molds must be produced in advance, and the components must be manufactured in combination with each other in a state in which each component is prepared and prepared in large quantities, thereby increasing the cost and inventory burden due to expensive mold manufacturing costs. And storage of components is experiencing significant difficulties.

In addition, in the case of various portable electronic devices are gradually developed in the form of a small and thin, the window module applied to such a slim electronic device should also be manufactured to have an extremely thin thickness, but the manufacturing method through the adhesion of the components as described above As the minimum thickness occupied by the components is overlapped, there is a limit to the reduction of the thickness, thus preventing the slimming of the electronic device itself.

In addition, all the windows, metal moldings, and injection moldings described above are selected by a method of fixing by adhesion, which causes a shortening of the life of the device when the adhesive layer is cured due to chemical change or the adhesion is lost. As the components of different physical properties are stretched and relaxed due to the change of seasons or the temperature difference between indoor and outdoor, the physical breakdown of these adhesive layers occurs quickly, and as a result, it acts as a cause of shortening the service life of electronic devices. .

Accordingly, in order to manufacture a window module for an LCD having a metal molding, the cured injection molded product and the metal molding are integrally combined by injecting a resin solution while the metal molding is inserted into the injection mold. Since the gap is hardly generated between the metal molding and the window, it prevents dust or foreign matter from entering into the gap and prevents the appearance from becoming dirty. Also, the printing part of various colors on the edge of the window (dust of the gap) The injection moldings of various colors, which are projected into the inside of the metal molding without being formed to visually disperse the box, are projected through the window and play the same role as the conventional printing unit, thereby making the manufacturing process and work process simpler. It is very economical because of the reduction of manufacturing cost and mass production. It is characterized by having excellent bondability with dough, which greatly improves durability, and since the fastening part having a flange part is injection molded, a manufacturing method that enables thinner thicknesses and contributes to slimming of electronic devices is widely used. It is being applied.

Looking at the manufacturing method of such a window module in detail, as shown in Figure 1 with a molding device divided into an upper mold 100 and a lower mold 101, the metal molding to the upper side of the lower mold 101 After inserting 102, the upper mold 100 and the lower mold 101 are joined together to inject the resin liquid into the mold, and the resin liquid is injected and cured according to the shape of the mold. ) Is molded.

Accordingly, when the molded article is taken out from the mold, as shown in FIG. 2, the metal mold 102 is exposed on the outer surface, and the injection frame 103 made of synthetic resin is molded on the inner bottom thereof, so that the molded article is separately formed. By attaching and forming the transparent cover 104 of the LCD protective window module is completed.

However, the manufacturing method of the window module as described above has a mold structure in which the runner formed through the upper mold and the lower mold is very long, and the resin liquid is raised from the lower side to the upper side so that the injection pressure acts greatly. Therefore, the injection molding machine will have an enlarged capacity or scale.

Since the metal mold is placed on the upper side of the lower mold and the upper mold is lowered, the upper mold is lowered. Therefore, the corners of the upper mold interfere with the surface of the metal molding to cause scratches or, in severe cases, the metal molding. Deformation may result in poor work.

In particular, the surface scratches of the metal molding as described above cause poor processing of the injection molded finished product, which is pointed out as a major cause of cost increase such as process loss and material loss as well as increase of labor cost, which is extremely uneconomical and careful in the working process. There is a problem that is inefficient because it requires precise skilled workers.

The present invention is to solve the problems as described above, to form a direct runner from the upper mold, the bottom mold is placed in the bottom surface of the metal molding facing the bottom of the bottom mold of the heat-resistant film or heat-resistant fiber paper or By forming a heat-resistant coating layer, the friction between the metal molding surface and the lower mold does not occur, thereby reducing the injection molding time as well as scratching the surface of the metal molding by the resin injected through the runner of the vertical direct. By inserting an intermediate mold between the upper mold and the lower mold, two window modules of different sizes can be produced simultaneously by the middle mold, whose upper and lower sides are joined to the upper mold and the lower mold, so that it is very economical and reasonable. Manufacturing method of window module for LCD having metal molding It is an object of the present invention to provide a method and a manufacturing apparatus thereof.

The present invention for achieving the object as described above, by injecting the resin liquid into the resin filling portion formed in the mold cross-section of the upper mold and the lower mold, the injection frame is molded on one surface of the metal molding located in the settled portion of the molding cross section In one LCD window module manufacturing apparatus, the injection frame is supplied directly to the resin through the runner in the upper mold to be molded from the resin filling portion, the inner surface of the lower mold is formed on the bottom surface of the lower mold of the metal mold It is configured to face, and is formed by forming a surface protective material on the bottom of the settled portion of the metal molding.

The present invention is to provide a high-quality and reasonable productivity by shortening the injection time and lowering the injection pressure by allowing the direct resin to be provided to the molding portion without passing through the lower mold to the upper mold, the metal molding by the heat-resistant surface protective material Since scratches or scratches are not generated on the surface of the surface, it is possible to reduce the product defect rate and improve productivity as well as cost reduction, and at the same time, it is possible to produce window modules of different sizes. To have.

The terms or words used in this specification and claims are not to be construed as being limited to the common or dictionary meanings, and the inventors can appropriately define the concept of terms in order to explain their invention in the best way. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

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

3 is a process diagram for manufacturing a window module according to the present invention, Figure 4 is a cross-sectional view showing a molding apparatus of the window module according to the present invention, Figure 5 is an exploded cross-sectional view showing a molding apparatus of the window module according to the invention, 6 is an enlarged cross-sectional view of main parts of a molding apparatus of a window module according to the present invention;

As shown, the window module molding apparatus according to the present invention is completed by injection molding the metal molding 30 and the resin on the molds of the upper mold 10 and the lower mold 20 and the end faces thereof, and the upper mold ( 10) and the resin filling portion 21 and the settled portion 22 are formed at the mating ends of the lower mold 20, respectively.

Accordingly, the metal molding 30 is inserted into the settled portion 22, and the upper mold 10 and the lower mold 20 are combined with each other in the state where the metal molding 30 is placed as described above. What is necessary is just to inject injection resin liquid into the resin filling part 21 through the runner 11 formed in the metal mold | die 10.

At this time, the runner 11 is directly connected to the resin filling portion 21 from the upper mold 10 without passing through the lower mold 20, and the settled portion 22 is the metal molding 30. The outer surface of the to be configured so that it can be settled toward the bottom of the mounting portion 22, the surface protective material 50 is formed on the bottom of the mounting portion 22.

Here, the surface protective material 50 is made of a heat-resistant film, heat-resistant fiber paper, or heat-resistant silicone layer that is commonly used, and in the state where the surface protection material 50 is formed on the settled portion 22, the metal molding 30 is thus formed. If it is settled to prevent the direct friction between the metal molding 30 and the lower mold 20 to prevent damage or scratches of the surface of the metal molding 30 by the lower mold (20).

In addition, a separate adhesive is applied to the inner surface of the metal molding 30, and the adhesive layer 31 by the adhesive improves the adhesiveness with the resin metal molding 30 to be injected to different materials. By bonding the metal and the synthetic resin in a solid state, these gaps are prevented from opening or falling off each other.

That is, the metal molding 30 may be formed of stainless steel (SUS), aluminum (AL), titanium (Ti), magnesium (Mg), zinc (Zn), or silver (Ag). According to the present invention, these metal materials are mostly beautiful and have high quality gloss, texture and color.

In this state, the adhesive is applied to the entire bottom surface of the metal molding 30, wherein the adhesive is 70 to 80% by weight of polyamide, 10 to 20% by weight of petroleum resin, 2 to 7% by weight of mineral oil, and amino By using a mixture of 3 to 7% by weight of silane,

Here, the polyamide in the adhesive by the above mixture induces adhesion as a base resin, enables adhesion to a wide range of surfaces, and facilitates adhesion of heterogeneous surfaces (SUS + PC, Al + PE, etc.) with large surface energy differences. do. If the polyamide is less than 70wt%, the effect is not sufficient, and if it exceeds 80wt%, there is no further effect increase, so the composition ratio of 70 to 80wt% is preferable.

Next, petroleum resin serves as a tackifying resin to lower the melting temperature of the adhesive and to provide a functional group in some cases, thereby improving initial wetting and adhesion, and controlling the solidification time. To perform. If the petroleum resin is less than 10wt%, the above-mentioned effect does not appear, and if it exceeds 20wt%, the result is that only the relative content of polyamide is reduced without further improving the effect, so that the composition ratio is 10 to 20wt%. Here, wettability refers to a property in which an adhesive is entangled while being spread on a surface of a plastic injection molded product.

The petroleum resin is an oil produced as a by-product of petroleum refining or petrochemical processes, and generically refers to plastics polymerized by various methods, containing olefins or diolefins as raw materials.

Next, the mineral oil is a plasticizer, which performs a lubrication role of the mixed resin to even out the flowability and distribution of the mixture and prevent the mixture from biasing a part of the product. If the content is less than 2wt%, there is a problem such as disturbing the flow of the resin and twisting the final product, if the content exceeds 7wt%, the fluidity is excessive and the resin overflows from the mold during the injection process.

In addition, the amino silane is an adhesive promoter (adhesive promoter or curing agent), and serves to improve adhesion between the base metal of the metal and the resin, and to promote wetting between the resin and the inorganic material. Since amino silane can change the adhesion, curing time and mechanical strength greatly depending on the amount of usage, it is necessary to pay attention to the usage. 3 to 7 wt% is preferable as a composition ratio that can satisfactorily satisfy these properties. Do.

After applying the adhesive is dried at room temperature for 20 minutes or more and maintained for 20 to 40 minutes at a temperature of 100 ~ 120 ℃ it can exhibit the maximum adhesive strength. This is because if the adhesive curing temperature is too low or the curing time is too short, the adhesive may drop out or overflow. If the curing temperature is too high or the curing time is too long, premature curing or some curing before injection may occur, resulting in weak adhesive strength. to be. In addition, when the room temperature drying time is short, bubbles are generated in the adhesive, resulting in poor adhesion.

Moreover, it is preferable that the application | coating thickness of the said adhesive exists in the range of 40-80 micrometers. If the coating thickness is too small, the part that does not come into contact with the resin partially occurs during the injection process at high temperature, the adhesive strength is lowered. If the coating thickness is too thick, the adhesive falls off and overflows from the mold, the adhesive strength falls or is included in the synthetic resin This can be adversely affected.

Such adhesives are prepared by conventional mixing. That is, all four components described above are put into a container and then mixed and manufactured by stirring with a general stirrer. In addition, the adhesive may be stored in a sealed container at room temperature.

The adhesive used in the present invention is a thermosetting resin, and when a temperature of 100 ° C. or more is applied to the applied adhesive, the adhesive is cured to maintain strong adhesion with the metal.

In addition, the adhesive in the present invention remains cured for approximately 10 days after application to the metal. That is, if the injection within 10 days after coating can be obtained an injection molding having a predetermined adhesive strength.

Therefore, when the adhesive is applied to the metal base material, dried and then packaged and injected within 10 days, a predetermined adhesive force can be exhibited.

As described above, the adhesive layer 31 is applied to the bottom surface of the metal molding 30, and then, the adhesive layer 31 is seated in the settled portion 22 of the lower mold 20, and the lower mold 20 on which the metal molding 30 is seated. When the upper mold 10 is bonded to each other on the upper side of) and the synthetic resin solution is injected into the resin filling portion 21 formed between the upper mold 10 and the lower mold 20, the resin liquid is cured. The injection frame 40 made of a synthetic resin material is bonded to the inner surface of the metal molding 30 by the adhesive layer 31.

When the resin solution is sufficiently cured as described above, when the upper mold 10 is separated from the lower mold 20 and the window module composed of the metal molding 20 and the injection frame 40 seated in the lower mold 20 is taken out, The window module for the completed LCD may be applied to various electronic devices and electronic products.

In addition, in the present invention, as shown in Figure 7 by inserting a separate intermediate mold 60 between the upper mold 10 and the lower mold 20 so that they can be combined with each other, the upper mold 10 and The resin filling parts 21, 21 'and the settled parts 22, 22' are formed in the mold part of the intermediate mold 60 and the mold part of the lower mold 20 and the intermediate mold 60, respectively. The runner 11 of the upper mold 10 is connected to the resin filling portion 21 of the mold 10 and the intermediate mold 60, and the resin filling portion 21 ′ of the lower mold 20 and the intermediate mold 60 is connected. The runner 61 of the intermediate mold 60 connected to the runner 11 is connected to.

Accordingly, when the injection resin solution is injected into the runners 11 and 61 through a single injection device, the injection molding is performed at the resin filling parts 21 and 21 '. While you can build modules, you can produce window modules of different sizes simultaneously as needed.

As described above, the method for manufacturing a window module and the apparatus for manufacturing the same according to the present invention allow to produce a window module having a metal molding more effectively and economically.

The embodiments described in the present specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, and various equivalents and modifications that may be substituted for them are provided. It should be understood that there may be examples.

1 is a cross-sectional view of a mold for producing a conventional window module

Figure 2 is a perspective view of the window module completed by the manufacturing method according to the injection molding

3 is a process chart for manufacturing a window module according to the present invention

4 is a cross-sectional view showing a molding apparatus of the window module according to the present invention.

5 is an exploded cross-sectional view showing a molding apparatus of the window module according to the present invention.

6 is an enlarged cross-sectional view of main parts of a molding apparatus of a window module according to the present invention;

7 is another embodiment of a window module molding apparatus according to the present invention

Explanation of symbols on the main parts of the drawings

10: upper mold 11: runner

20: lower mold 21,21 ': resin filling part

22,22 ': Settlement

30: metal molding 31: adhesive layer

40: injection frame

50: surface protective material

60: intermediate mold 61: runner

Claims (8)

A surface protective material is formed on a portion of the lower mold where the metal molding is placed, and the metal molding is formed by applying an adhesive to a portion where the injection molding is interviewed, and the outer surface of the metal molding is formed on the lower mold. After facing up against The upper mold and the lower mold are joined together so that the resin liquid provided from the runner of the upper mold is injected into the mold of the upper mold and the lower mold. When the resin liquid is cured and adhered at the adhesive coating part of the metal molding, the upper mold and Method of manufacturing a window module for an LCD having a metal molding characterized in that the lower mold is separated and the injection frame cured and adhered to the metal molding is taken out from the lower mold. The method of claim 1, An intermediate mold provided separately is formed between the upper mold and the lower mold, and a metal molding settling portion and an injection injection portion are respectively formed in the mold portion of the upper mold and the intermediate mold and the mold portion of the intermediate mold and the lower mold, respectively. Manufacturing of the window module for an LCD having a metal molding, characterized in that through the runner and the intermediate mold runner associated with the runner, the window module in the state that the injection frame is hardly bonded to the two metal moldings at a time is completed. Way. The method of claim 1, The surface protective material is a method of manufacturing a window module for an LCD having a metal molding, characterized in that made of any one of a heat-resistant film, heat-resistant fiber paper or heat-resistant silicon layer. The method of claim 1, Adhesive is a window module for an LCD having a metal molding, characterized in that 70 to 80% by weight of polyamide, 10 to 20% by weight of petroleum resin, 2 to 7% by weight of mineral oil, and 3 to 7% by weight of amino silane are mixed. Manufacturing method. The method of claim 1, Metal molding is an LCD having a metal molding, characterized in that made of any one of stainless steel (SUS), aluminum (AL) or titanium (Ti), magnesium (Mg), zinc (Zn), silver (Ag) Method for manufacturing a window module for. The resin solution is injected into the resin filling portion 21 formed in the mating cross section of the upper mold 10 and the lower mold 20, and an injection frame is formed on one surface of the metal molding 30 located in the settling portion 22 of the molding cross section. In the device for manufacturing a window module for an LCD to be molded 40), The injection frame 40 is provided with a resin directly through the runner 11 in the upper mold 10 to be molded from the resin filling portion 21, the settled portion 22 in the lower mold 10 is a metal molding The outer surface of the (30) is configured to face the bottom surface of the lower mold 20, the bottom of the settled portion 22 of the metal molding 30, characterized in that by forming a surface protective material (50) Device for manufacturing a window module for an LCD having a molding. The method of claim 6, Surface protective material (50) is a device for manufacturing an LCD window module having a metal molding, characterized in that made of any one of a heat-resistant film, heat-resistant fiber paper or heat-resistant silicon layer. The method of claim 6, Between the upper mold 10 and the lower mold 20, a separate intermediate mold 60 is configured to be mutually matched, the upper mold 10 and the intermediate mold 60 and the lower mold 20 and the intermediate mold (60) ), Each of the resin filling portions 21 (21 ') and the settled portions 22 (22') are formed in the fitting portion of Resin-filled portion (3) for the metal molding 30 inserted into each of the settled portions 22 and 22 'through the runner 61 of the intermediate mold 60 associated with the runner 11 of the upper mold 10. 21) A device for manufacturing an LCD window module having a metal molding, characterized in that the injection frame 40 is configured to be molded by (21 ').

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