KR101497422B1 - Slot for display panel protection - Google Patents

Abstract

The present invention relates to a slot used when a display panel of a liquid crystal display device is packed. Provided is the display panel protection slot which is made of urethane and polycarbonate materials suitable for the injection molding of a slot of a slot product, and provided to form a new type of a slot product manufactured by injection molding integrating an inside member of the urethane material with an outside member of the polycarbonate material, thereby improving productivity by reducing the number of processes and post-production costs; and is capable of significantly reducing the number of slots by forming an L-shaped slot product capable of covering both surfaces of a display panel at the same time, thereby improving work efficiency and functionality.

Description

Slot for display panel protection < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slot for protecting a display panel, and more particularly, to a slot used for packaging a display panel of a liquid crystal display device.

Generally, the display field for displaying a large amount of data by electrical signals as visual images in accordance with the information age is also rapidly developing.

(PDP), a full-charge display device (FED), an electroluminescent display device (ELD), and the like as a display device having excellent characteristics such as lightness, thinness, Has been introduced to replace CRT (cathode ray tube).

Such a display device is integrally modularized by a predetermined mechanical means together with a driving circuit for realizing an image or other necessary interlocking elements and mounted in a separate system in the state of a modularized display panel, .

Thus, the display device is treated as a finished product in the manufacturing process, and then accompanies a distant or near shift for a separate productization process depending on each application.

In order to reduce the time and cost for individual transportation, the display panel is packed in a plurality of units, and a dedicated packing tray is used for protecting the product from shock and protecting the product.

Such wrapping means for protecting the display panel is disclosed in Korean Patent Laid-open Publication No. 10-2011-0070547 entitled " Packing Container and Packaging Method of Liquid Crystal Display Module ", Korean Unexamined Patent Publication No. 10-2007-0066512 " A packaging assembly ", Korean Utility Model Publication No. 20-2011-0008397," packaging tool for flat panel display ", and the like.

6 and 7, a packaging tray 110 made of a foamed styrofoam material having a panel storage groove 100 formed in an inner area thereof is provided, At each corner of the receiving groove 100, a slot 120 is provided for protecting the panel and preventing dust from being generated.

Therefore, a total of eight slots 120 are attached to each of the four corners of the panel storage groove 100 in the packaging tray 110 with adhesive, and the display panel is housed in the panel storage groove 100 , Shipment, and so on.

The slot 120 is formed in a rectangular plate shape and has a laminated structure of an inner member 130 made of a silicone material and an outer member 140 made of an ABS material bonded to the styrofoam side.

The inner member 130 and the outer member 140 of the ABS material are cut to fit the inner and inner members 130 and 140 and the inner member 130 and the outer member 140 are bonded to each other with an adhesive, And then the four corners of the inner and outer members 130 and 140 attached thereto are subjected to "C" processing.

Here, as the post-processing, the corners of the inner and outer members 130 and 140 are processed so as to prevent the dust or the like which may affect the panel from being blown due to the sharp edges due to the broken edge of the styrofoam.

However, the conventional slot has a large number of processes such as cutting the inner member and the outer member respectively, applying the adhesive after the adhesive application, and processing the edge "C" The price competitiveness is low.

In addition, there is a disadvantage in that the workability is deteriorated as a whole because the work is difficult and the work time is long because a total of 8 slots in one packaging tray must be attached one by one while aligning the positions.

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 an injection molding method using a urethane material and a polycarbonate material suitable for injection for a slotted product and using an inner member of a urethane material and an outer member of a polycarbonate material The object of the present invention is to provide a slot for protecting a display panel which can secure cost competitiveness of a product by realizing a new type of slot product which is integrally manufactured, have.

It is another object of the present invention to provide a slot product which can simultaneously cover both sides of a corner of a display panel, thereby significantly reducing the number of slots, And a slot for protecting the display panel.

In order to achieve the above object, a slot for protecting a display panel provided in the present invention has the following features.

The display panel protection slot has a laminated structure of an inner member and an outer member made of different resin materials, while an inner member in contact with the panel side is made of a urethane material and an outer member in contact with the styrofoam side is made of a polycarbonate material And an outer member, which is secondarily injected with a polycarbonate material, is molded on one side of the inner member which is firstly injected with the urethane material.

Therefore, the display panel protecting slot is manufactured by the dual injection molding method using the urethane material and the polycarbonate material, thereby ensuring the price competitiveness due to the improvement of the productivity.

Here, it is preferable that an inner member receiving groove is formed on one surface of the outer member, and that the outer member and the inner member are integrally formed in such a manner that a part of the thickness of the inner member is accommodated in the inner member receiving groove.

In addition, the inner member and the outer member may be in the form of a plate having a rectangular shape or a plate having an "a " shape which can be simultaneously contacted on both sides of the panel edge.

Further, in the case of the inner member and the outer member, the corner portion may be formed in a "C" shape in the double injection molding.

The display panel protection slot provided in the present invention has the following advantages.

First, by manufacturing the inner member of urethane material and the outer member of polycarbonate by injection molding method, it is possible to improve the productivity by shortening the number of processes and to reduce the manufacturing cost (about 15% We can secure price competitiveness.

Second, by adopting the slot product of the letter "a ", the number of slots can be reduced, and workability, functionality, and durability can be improved.

Third, mass production system can be constructed by replacing the existing cutting + bonding + post-processing process with the batch process of double injection process.

Fourth, it is possible to realize an optimal slot product suitable for panel protection through application of materials having optimum physical properties and process improvement with optimum processing conditions.

1 is a perspective view showing a slot for protecting a display panel according to an embodiment of the present invention;
2 is a perspective view illustrating a use state of a slot for protecting a display panel according to an embodiment of the present invention.
3 is a perspective view illustrating a slot for protecting a display panel according to another embodiment of the present invention.
4 is a perspective view illustrating a use state of a slot for protecting a display panel according to another embodiment of the present invention.
5A and 5B are schematic views showing a method of representing a manufacturing mold of a slot for protecting a display panel according to the present invention
6 and 7 are perspective views showing a conventional slot for protecting a display panel and a state of use

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

FIGS. 1 and 2 are perspective views illustrating a slot for protecting a display panel according to an embodiment of the present invention and FIGS. 3 and 4 are perspective views illustrating a slot for protecting a display panel according to another embodiment of the present invention, to be.

As shown in FIGS. 1 to 4, the display panel protecting slot is manufactured as a single product type having a laminated structure by integrally molding different kinds of materials by a double injection method. It is possible to reduce the manufacturing cost and increase the productivity There is an advantage.

The display panel protection slot 12 is formed by laminating an inner member 13 made of urethane and an outer member 14 made of polycarbonate (PC). The inner member 13, The outer member 14 is integrally molded by a double injection method.

That is, in the slot 12, the outer member 14, which is secondarily extruded from a polycarbonate material having a hard characteristic, is integrally formed on one surface of the inner member 13, which is firstly injected with a urethane material, Which is manufactured by a double injection method.

The inner member 13 and the outer member 14 constituting the slot 12 are made of a urethane material and a polycarbonate material and a urea material and a polycarbonate material suitable for manufacturing a slot for panel protection by a double injection molding method. By applying each material, it is possible to secure the reliability of the slot product unlike the silicon material or ABS material, which shows disadvantages of the material used in the conventional adhesive slot, for example, difficulty in injection molding and warping in injection molding .

The inner member 13 and the outer member 14 are integrally formed in a state of being in the form of a quadrilateral flat plate and are in contact with one side of each other. The inner member 13 at this time is in contact with the edge of the display panel, The member 14 is brought into contact with a packaging tray 10 such as a styrofoam accommodating the display panel.

The slot 12 formed by the combination of the inner member 13 and the outer member 14 has an optimal size and thickness to stably protect the edge portion of the panel in the packaging tray 10. [

That is, the slot 12 can be made of a standard of width x length x thickness = 80 to 85 mm x 25 to 35 mm x 3 to 5 mm, preferably 83 mm x 30 mm x 3.5 mm.

As another example of the shape of the slot 12 constituting the inner member 13 and the outer member 14, it is possible to have a plate shape of "a" shape capable of supporting both sides of the edge of the display panel simultaneously do.

In this case, the inner member 13 and the outer member 14 are each formed into a letter "A" shape, and the letter "A" So that it can be integrally formed.

Accordingly, the slot 12 can be closely contacted with the corner of the display panel using the "a" shape so that both sides of the corner can be supported by four contacts simultaneously.

By adopting the slot 12 in the shape of the letter " a "like this, the number of slots used in one packaging tray 10 can be reduced from eight to four, and therefore, The panel can be supported by the two flat plate slots separately attached to each other, compared with the case where the panels are closely supported by the separately attached plates, It is possible to obtain an advantage in a functional aspect by closely supporting the panel with the "a" shaped slot.

Particularly, the inner member 13 and the outer member 14 of the slot 12 have a tight coupling structure and can be stacked and combined.

For example, a rectangular inner member receiving groove 15 is formed on one side of the outer member 14, and a part of the thickness of the inner member 13 The outer member 14 and the inner member 13 can be formed integrally with each other in such a manner that the outer member 14 and the inner member 13 are accommodated.

That is, after the outer member 14 and the inner member 13 are each formed to a thickness of about 2 mm, the depth of the inner member receiving groove 15 in the outer member 14 is about 0.5 mm, The inner member 13 can be formed integrally with the inner member receiving groove 15 by about 0.5 mm when the outer members 13 and 14 are assembled.

By using the groove structure, the inner member 13 and the outer member 14 are connected to each other and are integrally injection-molded so that the tight coupling force between the two members can be ensured. As a result, the durability and the like of the slotted product can be improved do.

The slot 12 is formed by forming the corners of the inner member 13 and the outer member 14 into a "C " shape 16 without performing post-production chamfering, i.e., .

That is, the corner portion of the inner member 13 and the outer member 14 can be naturally formed in a "C" shape through the cavity structure of the mold during the double injection molding.

The slots 12 are fixed to the four corners of the panel receiving groove 11 formed in the inner area of the package tray 10 for display packaging. For example, And an adhesive is applied to the surface of the member (14) to be adhered to the wall surface of the corner portion of the panel receiving groove (11).

Here, in the case of the flat plate type slot 12, a total of 8 pieces are formed in each corner portion, two pieces in total, and in the case of the "A" shaped slot 12, one piece is provided at each corner portion, Respectively.

When the display panel is inserted into the panel receiving groove 11 in the state where the slot 12 is installed, the display panel at this time is positioned on the inner side surface (inner member surface) of the slot 12 at each corner of the panel receiving groove 11, So that it can be packed while being supported in a state in which the four corners are closely adhered to each other.

5A and 5B are schematic views showing a method of manufacturing a mold for protecting a display panel according to the present invention.

As shown in FIGS. 5A and 5B, the mold for manufacturing the display panel protecting slot is composed of injection portions 17a and 17b, a mold portion 18 and a mold moving portion 19, It is possible to manufacture a slot by using a double injection method using a urethane resin and a polycarbonate resin as a material of the base.

That is, the urethane resin constituting the slot inner member from the primary injection portion 17a is injected into the mold portion 18 to form the urethane inner member of the urethane material, and then the secondary injection portion 17b The polycarbonate resin constituting the slot outer member is injected into the mold section 18 to mold the outer outer member of the polycarbonate material so that the inner member of the urethane material and the outer member of the polycarbonate material are integrally formed The slot can be manufactured by the double injection method.

In the dual injection process for manufacturing such a slot, the melting temperature is 290 to 310 ° C, the nozzle temperature is 280 to 300 ° C, the barrel temperature (rear / middle / front) is 290 to 310 ° C / 280 to 300 ° C / 270 to 290 ° C , The hopper temperature can be maintained at 60 to 80 占 폚, and the mold temperature can be maintained at 60 to 90 占 폚.

As the drying conditions after the double injection molding, the drying temperature is 110 to 130 占 폚, preferably 120 占 폚, the drying time is 3 to 5 hours, preferably 4 hours, and the maximum moisture content is 0.1 to 0.001% 0.02%.

The injection molding conditions and the drying conditions for manufacturing such a slot can be said to be optimal conditions for ensuring optimum physical properties for the material of the inner and outer members which are to be described later.

In other words, by applying a combination of urethane and polycarbonate as a double injection material for manufacturing a slot, and performing a double injection process through the above injection molding condition and drying condition in combination, the optimal physical properties of a slot .

On the other hand, the physical properties of each material of the slot for protecting the display panel manufactured by the double ejection method will be described as follows.

Table 1 shows the physical properties of the slotted outer member manufactured by the double injection method using the polycarbonate material.

Table 1

As shown in Table 1 above, the physical properties of the outer member of the slot made of polycarbonate were measured, and as a result, the melt index (300 ° C, 1.2 kg) (Test method ASTM D955), preferably 1.20 and a shrinkage ratio of 0.5-0.7% (test method ASTM D955), preferably 10 g / 10 min (test method ASTD D1238), preferably 15 g / to be.

On the other hand, in the case of the physical properties of the slotted outer member molded from a polycarbonate material, the tensile strength (yield: 50 mm / min) is 600 to 650 kgf / cm 2 (test method ASTM D638), preferably 630 kgf / (test method ASTM D790), preferably 920 kgf / cm < 2 >, and the flexural modulus (break, 50 mm / min) (10 mm / min) is 20,000 to 30,000 kgf / cm 2 (test method ASTM D790), preferably 24,000 kgf / cm 2 and the IZOD impact strength is 70 to 80 kg · cm / Method ASTM D256), preferably 75 kg · cm / cm.

On the other hand, a urethane material [TPU-CS-85A (308143)] is applied to the inner member of the display panel protecting slot, and the master batch MB-SU-200 (130805) is mixed as an antistatic agent in the urethane material.

For example, the slotted inner member is doubly injection molded from a mixture of 70 to 80% by weight of a urethane resin and 20 to 30% by weight of a master batch, preferably 75% by weight of a urethane resin and 25% by weight of a master batch.

Table 2 and Table 3 show the physical properties of the slot inner member manufactured by the double injection method using the polycarbonate material containing the master batch.

Table 2

Table 3

As shown in Table 2, the hardness (SHOR A, SHOR D) was 85-86A (test method ASTM D2240), 100% modulus ) Is 70 to 90 kgf / cm 2 (test method ASTM D412), preferably 78 kgf / cm 2, 300% modulus is 130 to 170 kgf / cm 2 (test method ASTM D412), preferably 150 kgf / (Test method ASTM D412), preferably 464 kgf / cm2, breaking strength of 100 to 140 kgf / cm (test method ASTM D264), preferably 122 kgf / cm, elongation at break of 550 to 500 kgf / 590% (test method ASTM D412), preferably 570%, and the melt index is 20 to 40 g / 10 min, preferably 28 g / 10 min.

As shown in Table 3 above, the physical properties of the master batch mixed with the urethane material constituting the inner member of the slot were measured, and as a result, the hardness (SHOR A, SHOR D) was 85 to 86 A (Test Method ASTM D2240) (Test method ASTM D412), preferably 443 kgf / cm2, and a breaking strength of 100 to 130 kgf / cm < 2 > (test method ASTM D792), preferably 1.2 and a tensile strength of 400 to 500 kgf / Test method ASTM D264), preferably 117 kgf / cm, elongation at break 550-600% (test method ASTM D412), preferably 585%, and surface resistivity 2.0 x 10E6? / Square ASTM D257), and the melt index is 30 to 50 g / 10 min, preferably 40 g / 10 min.

As described above, in the present invention, urethane material, master batch, and polycarbonate material having optimum physical properties suitable for the slots used in the display panel packaging are applied, and the process conditions of the dual injection method in connection with the physical properties of the materials It is possible to improve the productivity by shortening the number of process steps and the reduction of the machining cost and also to improve the workability by greatly reducing the number of slots, The durability and functionality of the device can be enhanced.

10: Packaging tray 11: Panel storage groove
12: Slot 13: Inner member
14: outer member 15: inner member receiving groove
16: "C" shape portion 17:
18: Mold part 19: Mold moving part

Claims (8)

In a display panel protection slot having a laminated structure of an inner member and an outer member made of different resin materials,
The inner member which is in contact with the panel side is made of urethane material, and the outer member which is in contact with the styrofoam side is made of polycarbonate material. The outer member which is secondarily injected with polycarbonate on one side of the inner member which is firstly injected with the urethane material Are integrally molded into a double injection,
Wherein the urethane material used as the material of the inner member is a material including a master batch for preventing electrification and is made of a material in which 70 to 80 wt% of the urethane material and 20 to 30 wt% Slot for panel protection.
The method according to claim 1,
Wherein an inner member receiving groove is formed on one surface of the outer member and a part of the thickness of the inner member is accommodated in the inner member receiving groove so that the outer member and the inner member are integrally formed.
The method according to claim 1 or 2,
Wherein the inner member and the outer member are formed in a rectangular flat plate shape.
The method according to claim 1 or 2,
Wherein the inner member and the outer member are formed in the shape of a letter "A " such that the inner member and the outer member can simultaneously contact both sides of the panel edge.
The method according to claim 1 or 2,
Wherein the inner member and the outer member are formed in a "C" shape at an edge portion in a double injection molding.
delete The method according to claim 1 or 2,
As the injection conditions for the double injection molding of the inner member and the outer member, the melting temperature is 290 to 310 占 폚, the nozzle temperature is 280 to 300 占 폚, the barrel temperature (rear / middle / front) is 290 to 310 占 폚 / 280 to 300 占 폚 / A hopper temperature of 60 to 80 캜, and a mold temperature of 60 to 90 캜.
The method according to claim 1 or 2,
Wherein the drying conditions for the dual injection molding of the inner member and the outer member are set at a drying temperature of 110 to 130 캜, a drying time of 3 hours to 5 hours, and a maximum moisture content of 0.1 to 0.001% .

Images