KR100785957B1 - Composite Sheet and Apparatus for Manufacturing The Same - Google Patents

Abstract

In the composite sheet used in the crimping step, which is one of the manufacturing steps of the electronic device, the present invention relates to a sheet 11 having a heat resistance made of fluorine resin, and a silica fine particle layer 12 formed on one surface of the sheet 11; The composite sheet 14 provided with the silicone rubber layer 13 which has heat resistance formed on this silica fine particle layer 12 is provided.

Description

Composite Sheet and Apparatus for Manufacturing The Same}

1 is a cross-sectional view of a composite sheet according to Example 1 of the present invention.

2 is a cross-sectional view of a composite sheet according to Example 2 of the present invention.

3 is a cross-sectional view of a composite sheet according to Example 3 of the present invention.

4 is an explanatory diagram of a composite sheet manufacturing apparatus used for producing a composite sheet according to Examples 1 and 2 of the present invention.

5 is an explanatory view of a composite sheet manufacturing apparatus used for producing a composite sheet according to a third embodiment of the present invention.

6 is an explanatory view of a use example of a conventional cushioning material.

The present invention relates to an electronic device, in particular a flat panel display (FPD), more particularly a composite sheet used in the pressing process which is one of the manufacturing process of the color TFT liquid crystal module or color STN liquid crystal module and its manufacturing apparatus.

In the manufacturing process of the conventional electronic device, the crimping process as shown in FIG. 6 is performed.

In the drawing, reference numeral 1 denotes a glass substrate on which an terminal 2 is formed. At the end of the glass substrate 1, the end of the flexible substrate 3 is laminated by thermocompression bonding. Here, the flexible substrate 3 is equipped with the film 5 in which the circuit 4 was formed, and the anisotropic conductive film 6 formed in a part of the circuit 4. On the thermocompression scheduled portion between the glass substrate 1 and the flexible substrate 3, a heater 8 provided with a cushioning material (scarved tape) 7 is disposed at the lower end portion. Reference numeral 9 denotes a ray film (protective film).

By the way, as said cushioning material, the silicone rubber sheet (electronic) or the fluororesin sheet (the latter) which has mold release property is used conventionally. However, the former cushioning material can be used several times in thermal compression, but the release property is not so good. On the other hand, the latter cushioning material is good in releasability, but the cushioning property is remarkably deteriorated, and is intended for single use.

In order to solve such a problem, a cushioning material is known in which a conventional fluorine resin (for example, PTFE) is chemically etched on one surface and laminated with an unvulcanized silicone rubber sheet. By the way, since the said PTFE has little effect of an electrical etching, chemical etching is performed. That is, it is used by processing the etching liquid which melt | dissolved metal sodium in tetrahydrofuran, replacing fluorine on a surface with hydroxyl groups, etc., and making it wet.

However, the activated fluorine resin surface has been known to be inactivated with time to reduce the treatment effect, and there is a problem in productivity. In addition, since the etching treatment uses metal sodium, there is a high risk of ignition (explosion) when inadvertently contacted with water, and it is necessary to pay attention to the handling and storage place sufficiently. In addition, since a large amount of organic solvent is used, there is a high risk of injury to workers by inhalation. In addition, in a composite product in which one side of the fluororesin is chemically etched and the unvulcanized silicone rubber sheet is laminated, it is difficult to manufacture the continuity of the work and to manufacture the thin object.

An object of the present invention is to provide a sheet-shaped heat resistant substrate made of a fluorine resin containing a fluorine resin or a conductive material, a silica fine particle layer formed on one surface of the heat resistant base material, and a heat resistant rubber layer formed on the silica fine particle layer. Accordingly, the present invention provides a composite sheet that is excellent in releasability and cushioning properties, and has excellent safety, economy, and productivity, and is capable of making long and thin articles.

Another object of the present invention is to form a sheet-shaped heat resistant substrate formed by blending a heat resistant fibrous fabric with a fluorine resin or a fluorine resin containing a conductive material, a silica fine particle layer formed on one surface of the heat resistant base material, and formed on the silica fine particle layer. It is to provide a composite sheet which can achieve the same effect as mentioned above by setting it as the structure provided with a heat resistant rubber layer.

Still another object of the present invention is to provide a sheet-shaped heat-resistant base material made of fluorocarbon resin, a coating roll for coating a predetermined amount of a rubber coating agent on the heat-resistant base material, and drying the heat-resistant base material coated with a rubber coating agent. The first furnace, the second furnace for calcining the heat-resistant base material passed through the first furnace to form a composite sheet, and the rolls for curling to wind the calcined composite sheet are excellent in releasability and cushionability. At the same time, the present invention provides an apparatus for manufacturing composite sheets, which is excellent in safety, economical efficiency, productivity, and obtains composite sheets capable of making long and thin articles.

The first invention of the present application is a composite sheet used in a crimping step, which is one of electronic device manufacturing steps, comprising: a sheet-shaped heat resistant substrate made of a fluorine resin containing a fluorine resin or a conductive material, and silica formed on one surface of the heat resistant substrate. It is a composite sheet provided with a microparticle layer and the heat resistant rubber layer formed on this silica microparticle layer.

The second invention of the present application is a composite sheet used in a crimping step, which is one of the manufacturing steps of an electronic device, comprising: a sheet-shaped heat-resistant base material comprising a fluorine resin containing a fluororesin or a crystalline resin in a heat-resistant fiber woven fabric; A composite sheet comprising a silica fine particle layer formed on one surface of a heat resistant substrate and a heat resistant rubber layer formed on the silica fine particle layer.

The third invention of the present application is a feeding roll for sending out a sheet-shaped heat resistant substrate made of fluorine resin, a coating roll for applying a predetermined amount of a rubber coating agent on the heat resistant substrate, and a first furnace for drying the heat resistant substrate coated with a rubber coating agent. And a second furnace for firing the heat resistant substrate passed through the first furnace to form a composite sheet, and a winding roll for winding the fired composite sheet.

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail.

In the present invention, as the fluororesin, for example, tetrafluoroethylene resin (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-6 fluorinated propylene copolymer resin (FEP) and the like And in particular, PTFE is preferred.

In the present invention, the conductive material may be, for example, a white conductive acicular single crystal, for example, conductive whisker (trade name: Dentol WK-200B, manufactured by Otsuka Chemical Co., Ltd.), carbon black, graphite, carbon fiber, Metal powders, such as gold, silver copper, aluminum, and palladium, are mentioned.

In the present invention, heat-resistant fiber woven fabric is classified into inorganic fiber woven fabric and organic fiber woven fabric. Here, the inorganic fiber woven fabric includes, for example, a woven fabric made of glass fiber, carbon fiber, ceramic fiber such as alumina, or a metal fiber such as stainless steel. Examples of the organic fiber woven fabric include a woven fabric made of any one selected from polyamide fibers, polyaramid fibers, polyester fibers, and polyvinyl alcohol fibers.

In the present invention, examples of the material of the thermally conductive fine particles include metal powders such as alumina, titania, magnesium oxide, silica, carbon black, graphite, gold, silver, copper, aluminum, and palladium.

EMBODIMENT OF THE INVENTION Hereinafter, the composite sheet which concerns on each Example of this invention, and its manufacturing apparatus are demonstrated with reference to drawings. However, the numerical value of each member in the following Example showed the example and this invention is not limited to this.

(Example 1)

1 is a sectional view of a composite sheet according to Example 1. FIG. In the figure, reference numeral 11 denotes a sheet made of a fluororesin (for example, PTFE) as a heat resistant substrate. One surface of the PTFE sheet 11 is formed with a silicone rubber sheet 13 as a heat resistant rubber layer through the silica fine particle layer 12.

The composite sheet 14 of this configuration is manufactured using the apparatus shown in FIG. Reference numerals 21 and 22 in FIG. 4 denote first furnaces (drying furnaces) for drying and second furnaces (firing furnaces) for baking, respectively. On the upstream side of the first furnace 21, a feed roll 23, a roll 24, a pair of back-up rolls wound around a surface-treated PTFE sheet 11 (that is, the silica fine particle layer 12 is formed) ( 25) and a metering roll 27 with a coating roll 26 and a doctor blade 27a are arranged. The metering roll 27 serves to send a certain amount of rubber coating agent to the coating roll and the coating roll 26 serves to apply a rubber coating agent to one surface of the sheet (11). Further, in the vicinity of the coating roll 26, containers 28 containing liquid silicone rubber coating agents 28a are disposed, respectively. On the downstream side of the second furnace 22, a winding roll 29 for winding the composite sheet 14 is disposed. In addition, the code | symbol 30a, 30b, 30c, 30d, 30e in a figure represents a roll, respectively.

First, a mixed dispersion (surface treatment solution), which was mixed for 1 hour by mixing the ultrafine silica powder, the surfactant, and the PTFE aqueous dispersion, was uniformly applied to one surface of the PTFE sheet 11 having a thickness of 0.05 mm, and the furnace (not shown). After incorporating into a film and drying at 100 ° C, surface treatment was performed by baking at 360 ° C. Next, an organic solvent (e.g., toluene, key) in advance is easy to apply the heat-dissipating silicon (e.g., Dongle Co., Ltd., Dow Corning, Silicon Co., Ltd. product name: SE4400 (Elastomer type)) made of liquid silicone rubber. Dilution with silane, hexane) and vacuum degassing. And this coating agent 28a was accommodated in the said container 28.

Next, the PTFE sheet 11 surface-treated in the winding roll 23 is sent in the arrow X direction, and the coating agent 28a is surface-treated of the sheet 11 via the metering roll 27 and the coating roll 26. Apply evenly to the surface so that the thickness is 0.15mm. Subsequently, the sheet 11 is sent to the first furnace 21, dried at 80 ° C., and the sheet 11 is sent to the second furnace 22, and thermally cured at 150 ° C. to produce a composite sheet having a total thickness of 0.2 mm 14. ).

Since the composite sheet 14 according to the first embodiment has a configuration in which a silicone rubber sheet (heat resistant rubber layer) 13 is formed on one surface of the PTFE sheet 11 through the silica fine particle layer 12, it has excellent releasability and cushioning properties. . Moreover, since there is no treatment by metal Na like the conventional one, it is excellent in safety and productivity. In addition, by interposing the silica particle layer 12 which improves the wettability between the sheet 11 and the silicone rubber sheet 13, the peeling strength between the two 11 and 13 is larger than that of the conventional sheet, and the long production and the thin material Manufacturing can be realized.

In addition, the apparatus for producing a composite sheet according to the first embodiment includes a feeding roll 23 for feeding the PTFE sheet 11, a coating roll 26 for coating a predetermined amount of a rubber coating agent on the PTFE sheet 11; And a first furnace 21 for drying the PTFE sheet 11 to which the rubber coating agent is applied, a metering roll 27 for sending a predetermined amount of a rubber coating agent to the coating roll 26, and the first furnace 21. The second furnace 22 for firing the coarse PTFE sheet 11 to form the composite sheet 14 and the roll roll 29 for winding the fired composite sheet 22 are provided. By the constituent device in this regard, a composite sheet 14 having better peel strength, superior safety, workability, economy and practicality than a conventional composite sheet can be obtained.                     

In fact, the interlaminar peel strength of the PTFE sheet and the silicone rubber in the obtained composite sheet was measured by the T-type peeling method (JIS K 6328), and it was judged that the peel strength was 10 N / 15 mm or more because the silicone rubber was broken in the middle. It was confirmed that the peel strength was better than the conventional composite sheet produced by chemical etching of the surface treatment, and the safety, workability and economic efficiency were superior, and the practicality was high.

(Example 2)

See FIG. 2. However, the same members as in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted. In Example 2, a composite sheet 32 was produced in the same manner as in Example 1, except that a tetrafluoroethylene resin (PTFE) sheet 31 containing conductive carbon black (conductive material) was used as the substrate. The sheet 31 is composed of a glass fiber woven fabric 31a and a fluorine resin (PTFE) 31b impregnated and applied to the glass fiber woven fabric 31a.

As the composite sheet according to Example 2 has a configuration in which the silicone rubber layer 13 is formed on one surface of the sheet 31 through the silica fine particle layer 12, the same effect as in Example 1 is obtained. . Moreover, the said composite sheet can also be manufactured with the apparatus of FIG.

(Example 3)

See FIG. 3. The composite sheet 35 according to the third embodiment has a configuration in which a silicone rubber sheet 13 and PTFE sheets 33 and 34 are laminated on both surfaces of the silicone rubber sheet 13. Here, the silica particle layer 12a is formed on one surface of the PTFE sheet 33, the silica particle layer 12b is formed on one surface of the PTFE sheet 34, and the silica particle layers 12a and 12b face each other. The sheets 33 and 34 are laminated. The sheet 33 is composed of a glass fiber woven fabric 33a and PTFE 33b impregnated and applied to the glass fiber woven fabric 33a. On the other hand, the sheet 34 is composed of glass fiber woven fabric 34a and PTFE 34b impregnated and applied to the glass fiber woven fabric 34a.

The composite sheet 35 of the related structure is manufactured using the apparatus shown in FIG. However, the same member as FIG. 4 is attached | subjected with the same code | symbol, and abbreviate | omits description. Reference numerals 41 and 42 in FIG. 5 denote a delivery roll for feeding the PTFE sheet, and reference numerals 43a and 43b denote a pair of laminate rolls.

First, the glass cross is immersed in a PTFE dispersion, pulled up, and passed through a furnace (not shown) at 200 ° C. for about 5 minutes to dry moisture. Next, an impurity such as a surfactant is removed by passing through a furnace (not shown) at 310 ° C. for about 5 minutes. Subsequently, the mixed dispersion was applied to one surface of the substrate baked through a furnace (not shown) at 380 ° C. for 5 minutes, dried, and then calcined at 390 ° C. to carry out surface treatment. In addition, the silicone rubber solution was apply | coated to the surface of the base material surface-treated like Example 1, and it dried and thermoset.

As shown in FIG. 3, the composite sheet 35 according to Example 3 includes a silicone rubber sheet 13, a PTFE sheet 33 having a silica particulate layer 12a formed on one surface thereof, and a silica particulate layer 12b formed on one surface thereof. ) Is provided with a PTFE sheet 34 formed thereon, and the PTFE sheets 33 and 34 are laminated on both surfaces of the silicone rubber sheet 13 so that the silica fine particle layers 12a and 12b face each other. Therefore, according to the third embodiment, since the PTFE sheets 33 and 34 are formed on both surfaces of the other silicone rubber sheet 13 having the same effect as the first embodiment, the durability can be improved and the conductivity can be improved.

In addition, the apparatus for producing a composite sheet according to Example 3 includes a feeding roll 41 for feeding the PTFE sheet 33, a coating roll 26 for coating a predetermined amount of a rubber coating agent on the PTFE sheet 34, The metering roll 27 which sends a fixed amount of a rubber coating agent to this coating roll 26, the 1st furnace 21 which dries the laminated body 44 of the said PTFE sheet 33 and 34 to which the rubber coating agent was apply | coated, The second furnace 22 for firing the laminated body 44 passing through the first furnace 21 to form the composite sheet 35 and the roll for blowing back 29 for winding the fired composite sheet 35 It is equipped with the structure provided. By the apparatus of this structure, the composite sheet 35 which is more excellent in peeling strength than the conventional composite sheet, and is excellent in safety, workability, economy, and practicality is obtained.

In addition, although the case where PTFE dispersion was used was mentioned in the said Example 3, it is not limited to this, For example, you may use PTFE dispersion which mix | blended conductive carbon black.

(Example 4)

First, one surface of the substrate prepared in the same manner as in Example 2 was subjected to surface treatment with a mixed dispersion (ultrafine silica powder, surfactant, and PTFE aqueous acid solution), and a silicone rubber solution was applied to the surface. Next, the base material which surface-treated on one surface beforehand was put on the apply | coated surface, and it inserted into a nip roll and thermosetted.

The composite sheet according to Example 4 has a structure in which another heat-resistant base material subjected to surface treatment on one surface of the heat-resistant base material and surface-treated on the side of the heat treatment substrate is laminated through a silicone rubber layer having heat resistance. Therefore, since the silicone rubber layers are formed on both surfaces of the other heat resistant substrate having the same effect as in Example 1, the durability can be improved and the conductivity can be improved.

(Example 5)

The composite sheet was formed like Example 1 except having mix | blended magnesium oxide as thermally conductive fine particles with the silicone rubber solution of Example 1.

According to Example 5, it is possible to shorten the holding time associated with the thermocompression, thereby improving the production efficiency.

As described above, according to the composite sheet of the present invention, a sheet-shaped heat resistant substrate made of a fluorine resin containing a fluorine resin or a conductive material, a silica fine particle layer formed on one surface of the heat resistant substrate, and heat resistance formed on the silica fine particle layer The configuration provided with the rubber layer provides excellent releasability and cushioning properties, as well as excellent safety, economical efficiency and productivity, and enables long-length manufacturing and thin-film manufacturing.

In addition, according to the composite sheet of the present invention, a sheet-shaped heat resistant substrate formed by blending a fluorine resin containing a fluorine resin or a conductive material with a heat resistant fiber woven fabric, a silica fine particle layer formed on one surface of the heat resistant substrate, and the silica fine particle layer shape By setting it as the structure provided with the heat resistant rubber layer formed in this, the same effect as the above can be acquired.

In addition, according to the apparatus for producing a composite sheet of the present invention, a roll for sending out a sheet-shaped heat-resistant substrate made of fluorine resin, a coating roll for applying a predetermined amount of a rubber coating agent on the heat-resistant substrate, and the rubber coating agent is applied The first furnace for drying the heat resistant substrate, the second furnace for firing the heat resistant substrate passing through the first furnace to form a composite sheet, and the winding roll for winding the fired composite sheet are provided. At the same time, it is possible to obtain a composite sheet that is excellent in cushioning properties, has excellent safety, economy and productivity, and is capable of making long and thin articles.

Claims (11)

In the composite sheet used in the pressing process which is one of the manufacturing processes of an electronic device, the sheet-like heat resistant base material which consists of a fluorine resin containing a fluororesin or a conductive material, the silica fine particle layer formed in one surface of this heat resistant base material, A composite sheet comprising a heat resistant rubber layer formed on a silica fine particle layer. A first heat resistant substrate having a silica fine particle layer formed on one surface of the heat resistant substrate according to claim 1, and a second heat resistant substrate having a silica fine particle layer formed on one surface of the heat resistant substrate according to claim 1; A composite sheet comprising a structure in which second heat resistant substrates are laminated on both sides of a silica fine particle layer through a heat resistant rubber layer in a state of facing each other. The composite sheet according to claim 1, wherein the heat resistant rubber layer is obtained by applying and thermally curing a mixture of thermally conductive fine particles in a silicone rubber solution.  The composite sheet of claim 3, wherein the thermally conductive fine particles are selected from alumina, titania, magnesium oxide, silica, carbon black, graphite, gold, silver, copper, aluminum, and palladium. The composite sheet of claim 1, wherein the conductive material is selected from a conductive whisker, carbon black, graphite, carbon fiber, gold, silver, copper, aluminum, and palladium. In the composite sheet used in the crimping step, which is one of electronic device manufacturing processes, a sheet-shaped heat resistant substrate formed by blending a fluorine resin containing a fluorine resin or a conductive material with a heat resistant fiber woven fabric, and formed on one surface of the heat resistant substrate. A composite sheet comprising a silica fine particle layer and a heat resistant rubber layer formed on the silica fine particle layer. A first heat resistant substrate having a silica fine particle layer formed on one surface of the heat resistant substrate according to claim 6, and a second heat resistant substrate having a silica fine particle layer formed on one surface of the heat resistant substrate according to claim 6, A composite sheet comprising a structure in which the second heat resistant substrates are laminated on both sides of the silica fine particle layer through the heat resistant rubber layer therebetween. The composite sheet according to claim 6, wherein the heat resistant rubber layer is obtained by applying and thermally curing a mixture of thermally conductive fine particles in a silicone rubber solution.  The composite sheet of claim 8, wherein the thermally conductive fine particles are selected from alumina, titania, magnesium oxide, silica, carbon black, graphite, gold, silver, copper, aluminum, and palladium. The method of claim 6, wherein the heat-resistant fiber woven fabric is selected from among glass fiber, carbon fiber, ceramic fiber such as alumina, metal fiber such as stainless steel, polyamide fiber, polyaramid fiber, polyester fiber and polyvinyl alcohol fiber. Composite sheet, characterized in that selected.  A drying roll for sending out a sheet-shaped heat resistant substrate made of a fluorine resin or a fluorine resin containing a conductive material, a coating roll for applying a predetermined amount of a rubber coating agent on the heat resistant substrate, and the heat resistant substrate coated with a rubber coating agent And a second furnace for firing the heat-resistant base material passed through the first furnace to form a composite sheet, and a winding roll for winding the fired composite sheet. .

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