TWI383893B - Heat-resistant cushioning member for pressing - Google Patents

Description

Heat-resistant cushioning material for forming press

The present invention relates to a heat-resistant cushioning material for molding press-bonding (hereinafter referred to as a "cushioning material"), and particularly relates to a heat-resistant cushioning material having an excellent temperature rising rate and high cushioning property.

A product (laminated product) having a laminated structure is produced by, for example, holding between a plurality of hot plates and performing thermocompression bonding using the hot plates. An example of a laminate produced by this method is as follows. Further, in addition to the following examples, the laminated product has various diversified products.

(1) A laminate that becomes a substrate of a printed wiring board:

The laminated board is, for example, a paper phenol laminated board made of kraft paper and a phenol resin, or a glass epoxy laminated board made of a woven fabric of glass fibers and an epoxy resin.

(2) Printed wiring board:

The printed wiring board is a single-sided printed wiring board in which a conductor pattern is formed on one surface of a substrate, a double-sided printed wiring board in which a conductor pattern is formed on both surfaces of the substrate, and a multilayer printing in which a conductor pattern is formed not only on the outer surface of the substrate but also on the outer surface of the substrate. Wiring board, etc.

(3) Flat panel display: such as a liquid crystal display, electroluminescence, and the like.

(4) Semiconductor package: a chip size package (CSP) or the like having substantially the same size as a wafer.

The step of producing the various laminated products (shaped bodies) by the forming press-bonding device is to interpose a cushioning material between the hot plate and the laminated product. The cushioning material has a cushioning property so that the hot plate and the laminated product are not in direct contact with each other, and exhibits a function of uniformly transmitting heat generated by the hot plate to the laminated product.

A specific use example of the cushioning material will be described with reference to Fig. 1 . Fig. 1 is a cross-sectional view showing a molding press of a laminated board in the apparatus for manufacturing a double-sided printed wiring board.

In the molding press apparatus 1 shown in Fig. 1, a pair of cushioning materials C disposed on the inner side of the pair of hot plates 40 and the pair of hot plates 40, and the inner side of the cushioning material C are used. A pair of mirror panels 50, copper foil 60, and prepreg 70 are disposed.

Finally, the prepreg 70 and the copper foil 60 are used to form a double-sided printed wiring board. The prepreg 70 is formed by laminating a plurality of sheets by using a glass cloth in which a glass fiber cloth is impregnated with an epoxy resin and in a semi-hard state.

The laminate is formed by applying heat and pressure to the hot plates 40 and 40. The molding conditions at this time vary depending on the formulation of the epoxy resin material. Therefore, it is necessary to match the amount of heat transfer (temperature rising rate: ° C/min) of the cushioning material C used in the forming press-bonding step to the above-described forming conditions.

It is assumed that the amount of thermal movement of the cushioning material C is not consistent with the molding conditions of the epoxy resin, and the laminated product may be inferior in physical properties. For example, between the laminated product located at a position very close to the hot plates 40, 40 and the laminated product located at a central position between the hot plates 40, 40 and away from the hot plate 40, physical properties may occur. Further, even in the same laminated product, there is a possibility that physical properties are poor in the central portion and the peripheral portion.

The reason is that the resin viscosity in the prepreg 70 is temporarily lowered by thermal compression bonding, and after the resin is returned to the liquid state, the resin hardening manufacturing step is gradually performed. In this step, the hot plate 40 is pressed and pressed to rise. The timing of the pressure is offset.

That is, the bonding between the prepreg sheets 70, the bonding between the prepreg sheets 70 and the copper foil 60, and the removal of the air contained in the resin are performed by moving the resin, and the molding pressure is performed by temperature and pressure. The opportunity to meet is beyond the allowable range.

For example, when the viscosity of the resin is too low, if pressure is applied to the prepreg 70, the resin may flow more than necessary, resulting in an increase in the thickness of the central portion of the laminate and a decrease in the thickness of the peripheral portion. As a result, there is a problem that the thickness of the finally produced laminated product is uneven.

On the other hand, when the viscosity of the resin becomes too high, if pressure is applied to the prepreg 70, the resin does not sufficiently flow, and the air contained in the resin does not disappear, so that the insulation of the laminated product may cause problems. Therefore, the cushioning material C is required to have an excellent heating rate.

It is known from the self-study that kraft paper or the like is often used as a cushioning material during press forming. However, in recent years, due to the increase in size and precision of laminated products manufactured, it has been desired to have cushioning materials having excellent characteristics.

Such a cushioning material is, for example, a pulp containing inorganic fibers and a heat-resistant aromatic polymer (Japanese Patent Laid-Open Publication No. SHO 59-192795), and those containing aromatic polyamine fibers (Japanese Patent Laid-Open) Gaz. No. 62-156100). However, it is difficult to maintain cushioning properties of any of the cushioning materials, and thus the life is short.

For example, such a cushioning material is a heat-resistant cushioning material C4 for press-forming as shown in Fig. 6. Fig. 6 is a cross-sectional view showing a conventional heat-resistant cushioning material C4 for forming press-bonding.

The cushioning material C4 shown in Fig. 6 is composed of a base 11B, a short-fiber felt layer 11A laminated on the surface of the base 11B, and a needle-rolled short-fiber felt layer 11A laminated on the back surface of the base 11B.

Accordingly, the cushioning material C4 is laminated with two layers of the felt layers 11A and 11A. The short fiber of the felt layer 11A is composed of a meta-type aromatic polyamine. In the base 11B, a woven fabric formed by a warp yarn 11B1 composed of heat-resistant fibers and a weft yarn 11B2 is used.

Since the felt layer 11A of the cushioning material C4 is composed of a meta-type aromatic polyamine, the temperature increase rate can be easily adjusted. However, on the contrary, since the short fibers of the meta-type aromatic polyamide are difficult to maintain the cushioning property, the cushioning material C4 has a short life.

Therefore, in order to maintain the cushioning property of the cushioning material C4, it is considered to increase the areal density of the short fibers. However, if the areal density of the short fibers is increased, the heat transfer rate becomes slow, which makes it difficult to adjust the temperature increase rate, and the cushioning material C4 becomes heavy, resulting in deterioration in handability during use.

In order to solve such a disadvantage of the cushioning material C4, the heat-resistant cushioning material C5 for forming press-forming shown in Fig. 7 has been developed. Fig. 7 is a cross-sectional view showing another conventional heat-resistant cushioning material C5 for forming press-bonding.

The cushioning material C5 shown in Fig. 7 is composed of a base 21B, a short-fiber felt layer 21A laminated on the surface of the base 21B, and a needle-rolled short-fiber felt layer 21A laminated on the back surface of the base 21B. That is, the cushioning material C5 is laminated with the double-layered felt layers 21A and 21A.

The short fiber of the felt layer 21A is composed of a para-type aromatic polyamine mainly composed of polyparaphenylene terephthalate or phenylenediamine. The base 21B is a woven fabric having a warp yarn 21B1 and a weft yarn 21B2 made of heat-resistant fibers.

Since the felt layer 21A of the cushioning material C5 is composed of a para-type aromatic polyamine, the cushioning property is maintained good. However, since the thermal conductivity of the cushioning material C5 is too high, it is difficult to adjust the temperature rise rate of the cushioning material C5. In order to adjust the temperature increase rate, it is necessary to increase the areal density of the short fibers, but since the cushioning material C5 becomes heavy, the handability in use is deteriorated.

U.S. Patent No. 5,945,358 discloses a papermaking felt in which a spunbond nonwoven fabric is disposed in order to obtain a good void volume (void, porosity), migration stability, and abrasion resistance. The felt for papermaking is such that the spunbonded nonwoven fabric can be fixed to the felt for papermaking, and the cotton felt fibers are arranged in the thickness direction of the felt.

However, the papermaking is used by a felt to wander and apply pressure to the wet paper, and is not used for heating by a hot plate or the like.

Therefore, the felt for papermaking does not require characteristics such as heat resistance, temperature increase rate adjustment, and cushioning property maintenance. Therefore, there is no description of such characteristics relating to the effects of the present invention in the U.S. Patent No. 5,945,358.

[Patent Document 1] Japanese Patent Laid-Open No. 59-192795

[Patent Document 2] Japanese Patent Laid-Open No. 62-156100

[Patent Document 3] US Patent No. 5,945,358

The present invention has been made to solve such a problem, and an object of the present invention is to provide a heat-resistant cushioning material for forming press-bonding which is easy to adjust the temperature increase rate and excellent in cushioning property.

In order to achieve the above object, the present invention is a heat-resistant cushioning material for forming press-bonding in which a laminated product (formed body) is produced by a molding press device and laminated with a base material and a felt material. The cushioning material is provided with at least one layer (that is, one layer or two or more layers) of a felt layer containing heat-resistant staple fibers on one surface and the other surface of the base body. Inside the cushioning material, a plurality of raised fiber systems composed of short fibers having a fine fineness penetrate the base body, and are formed in the thickness direction of the cushioning material to connect all of the felt layers.

As a result, it is possible to obtain a cushioning property, and it is easy to adjust the temperature increase rate, and it is possible to uniformly transfer heat to the heat-resistant cushioning material for press-forming products having excellent characteristics.

The "felt layer containing heat-resistant short fibers" is formed by mixing heat-resistant short fibers with other short fibers, and the heat-resistant short fibers are at least 50% by weight or more.

The heat-resistant short fiber constituting the felt layer preferably contains one or more selected from the group consisting of meta-type aromatic polyamines, para-type aromatic polyamides, and fire-retardant fibers.

The raising fiber system is formed by needle-rolling interwoven fibers. The fluffing fiber system is composed of a fineness of 1.0 to 10.0 dtex (Danny) and heat-resistant short fibers. In this case, the fineness of the raised fiber body is preferably 1.0 to 6.0 dtex (more preferably 1.0 to 3.0 dtex).

The buffer material has a density of preferably from 0.3 g/cm ³ to 0.5 g/cm ³ . Further, it is preferable to laminate the surface layer on the surface of the cushioning material. The surface layer is joined to the cushioning material by a joining means (for example, a resin, a prepreg, a joined short fiber, or the like).

"Flocking fiber" means a fiber in which the short fiber axis of the raised fiber is aligned toward the thickness of the cushioning material. "Flocking fiber body" means that at least three of the above-mentioned raised fibers are bundled.

The raised fiber bundle according to the preferred cushioning material body plan, per unit area (1cm ²⁾ beams of at least 5 (i.e., beam 5 / cm ²⁾ configuration. Further, the upper limit of the number of raised fiber bundles of the cushioning material may be in a plan view of the cushioning material, and almost or all of the unit area may be occupied by the bundled raised fiber body. The aspect of the above-mentioned raised fiber body can be confirmed by a microscope (refer to Fig. 4).

"Formed in the thickness direction of the cushioning material" means that the short fiber axis of the raised fibers is formed in a substantially vertical direction with respect to the cushioning material base. In the present invention, the short fiber axis of the raised fiber is a cushioning material which is aligned in the range of 45 to 135 degrees and 225 to 315 degrees, respectively, with respect to the secondary surface which becomes the base, and is also covered by the "pilling fiber body". The structure is formed in the direction of the thickness of the cushioning material. In addition, as shown in FIG. 2 and FIG. 3 which will be described later, the X direction and the X direction extending from the weft yarn constitute the X and Z planes.

In the heat-resistant cushioning material for forming press-bonding of the present invention, since a plurality of raised fiber bodies composed of short fibers penetrate the substrate and are formed in the thickness direction of the cushioning material and connect the felt layers, the elastic material is exerted in the thickness direction of the cushioning material. Can mention The cushioning property of the cushioning material.

The basic structure of the heat-resistant cushioning material for press-forming of the present invention is a cushioning material used in the production of a laminated product by a molding press-bonding device, and is laminated with a matrix and a felt layer. The cushioning material is provided with at least one layer (that is, one layer or two or more layers) of a heat-resistant short fiber-containing felt layer, respectively, on one surface (surface) and the other surface (back surface) of the substrate. Inside the cushioning material, a plurality of raised fiber systems composed of short fibers of fine denier penetrate the substrate and are formed in the thickness direction of the cushioning material to join all the felt layers.

In particular, in the cushioning material, the heat-resistant short fiber constituting the felt layer preferably contains a meta-type aromatic polyamine (CONEX®, trade name / Teijin Co., Ltd.; NOMEX®, trade name/DuPont) One or more selected from the group consisting of a para-type aromatic polyamine (Kevlar®, trade name/DuPont); Twaron, trade name/made by Teijin Co., Ltd., and fireproof fibers.

For example, the felt layer may be composed of short fibers of meta-type aromatic polyamide and composite short fibers mixed with short fibers of para-type aromatic polyamide.

More specifically, the cushioning material is used in a heat-resistant cushioning material for forming press-bonding which is used when a laminated product is produced by a molding press device, and a layer is formed by a layer and a felt layer. The buffer material is a layer of a felt material containing short fibers of meta-type aromatic polyamine and another felt layer of short fibers containing para-type aromatic polyamide, respectively, on one side of the substrate ( The surface) and the other surface (back surface) are each provided with at least one layer (that is, one layer or two layers or more).

Inside the cushioning material, a plurality of raised fiber systems composed of short fibers having a fine fineness penetrate the base body, and are formed in the thickness direction of the cushioning material to join all the felt layers.

Among these cushioning materials, it is preferred that the hair-receiving fiber system is formed by interlacing fibers between needle-rolling and heat-resistant short fibers having a fineness of 1.0 to 6.0 dtex (Danny). More preferably, the buffer material has a density of 0.3 g/cm ³ to 0.5 g/cm ³ .

Since the interfiber interweaving of the fat denier fibers is weak, it is difficult to form a high-density fluff fiber body. Therefore, in the present invention, the raised fiber system has fine fiber heat-resistant short fibers. That is, a high-density raised fiber body is formed by inter-fiber interlacing by needle rolling using a fine-density heat-resistant short fiber.

Therefore, a plurality of raised fiber bodies composed of such fine-density short fibers penetrate the base body inside the cushioning material, and are formed in the thickness direction of the cushioning material to join all the felt layers. In this case, the high-density majority of the raised fiber body can exert an elastic effect on the thickness direction of the cushioning material. Therefore, the cushioning material can be easily adjusted in temperature rise rate and excellent in cushioning durability.

However, when the raising fiber system is formed in the thickness direction of the cushioning material without passing through the cushioning material base, the raising fiber body exerts an elastic action, but the temperature increase rate adjustment of the cushioning material is deteriorated. The reason is that the raised fiber body composed of the fine fine fibers has not penetrated the cushioning material base, and thus the thermal conductivity of the cushioning material in the thickness direction is deteriorated.

In addition, when the density of the cushioning material is from 0.3 g/cm ³ to 0.5 g/cm ³ , the cushioning material is increased in elasticity due to the high density, and the effect of multiplying the cushioning property of the raised fiber body is enhanced, and the cushioning property is further improved.

A surface layer is preferably laminated on the surface of the cushioning material. According to this, when the composite product (formed body) is heated and pressed, the surface of the surface layer undergoes follow-up deformation in accordance with the shape of the uneven surface of the laminated product. As a result, since the surface layer is in close contact with the laminated product, the cushioning material can easily adhere to the uneven surface of the laminated product. Therefore, the hot plate can equally transmit the pressing force to the laminated product via the cushioning material.

The surface layer is preferably a cover film or a metal foil, or a heat resistant resin having a mold release property to the hot plate.

As the cover film, a polyamide resin or a polystyrene resin which is a film for press molding can be used, and a polyolefin resin can also be used. In addition, the cover film may also be composed of fibers mainly composed of poly-p-phenylisophthalamide. (trade name / DuPont company) paper, etc.

As the metal foil, for example, an aluminum alloy foil, a stainless steel foil, or the like can be used. The heat resistant resin is derived from tetrafluoroethylene/ethylene copolymer (ETFE), tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), and polytetrafluoroethylene. Selected from the group consisting of ethylene (PTFE).

Further, in order to laminate (dispose) the surface layer on the surface of the cushioning material, a resin, a prepreg or a bonded fiber is used.

As the resin, an epoxy resin or a polyimide resin can be used, and a heat-fusible resin such as a fluorine film or the like can also be used. As the prepreg, a glass epoxy prepreg or the like can be used. Bonding fiber systems can be used such as unstretched Fiber, wholly aromatic polyester fiber (trade name: ).

Next, an embodiment of the present invention will be described with reference to Figs. 1 to 5 .

2 is a cross-sectional view showing a heat-resistant cushioning material for forming press-bonding according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a heat-resistant cushioning material for forming press-bonding according to another embodiment, and FIG. 4 is a drawing pressure shown in FIG. An enlarged cross-sectional view of a heat-resistant cushioning material.

In Fig. 2 and Fig. 4, the first cushioning material 10 is composed of a base 10B, a first felt layer 1A laminated on the surface (surface of one side of the hot plate 40) on one side of the base 10B, and laminated on the base 10B. The second felt layer 1B on the other side (back surface), the third felt layer 1C laminated on the surface of the first felt layer 1A, and the fourth felt layer 1D laminated on the surface of the second felt layer 1B are formed.

The first felt layer 1A and the second felt layer 1B are attached to the front surface and the back surface of the base 10B by needle rolling, respectively. The third felt layer 1C is attached to the first felt layer 1A by needle rolling. The fourth felt layer 1D is attached to the second felt layer 1B by needle rolling.

The plurality of raised fiber bodies 30 composed of the fine fine fibers are passed through the base 10B, and are formed in the thickness direction of the cushioning material 10 to connect all the felt layers 1A, 1B, 1C, and 1D.

In the first cushioning material 10 shown in Fig. 2, the first felt layer 1A, the second felt layer 1B, the third felt layer 1C, and the fourth felt layer 1D each contain a meta-type aromatic polyamine. Or one of the para-type aromatic polyamines, or both.

For example, the third felt layer 1C and the fourth felt layer 1D are composed of a short fiber (here, a meta-type aromatic polyamide) felt material having a low thermal conductivity. In this case, the heat unevenness of the hot plate 40 can be alleviated.

Further, the first felt layer 1A and the second felt layer 1B are composed of a short fiber (here, a para-type aromatic polyamide) felt having a high thermal conductivity. In this case, since the cushioning property is improved, the entire cushioning material 10 can be set to adjust the temperature increase rate and the cushioning property in a balanced manner.

The second cushioning material 20 shown in Fig. 3 has a structure in which the surface layer 1E is laminated on the surface of the first cushioning material 10 (Fig. 2) (here, one surface and the other surface). That is, the surface layer 1E is joined to the surface of the third felt layer 1C by the joining means P. The surface layer 1E is also joined to the surface of the fourth felt layer 1D by the joining means P.

In the second cushioning material 20, the first felt layer 1A, the second felt layer 1B, the third felt layer 1C, and the fourth felt layer 1D each contain a meta-type aromatic polyamine or a para-fragrance One of the polyamidoamines, or both.

In the first cushioning material 10 and the second cushioning material 20, the base 10B is formed of a woven fabric in which warp yarn 10B1 composed of heat-resistant fibers and weft yarn 10B2 are woven. The heat-resistant fiber is derived from meta-type aromatic polyamine, para-type aromatic polyamine, wholly aromatic polyester fiber, poly-p-phenylene bis-bis A group consisting of azole (PBO) fibers and stainless steel fibers is selected.

The base 10B preferably enhances the strength of the woven fabric which is woven by the warp yarn 10B1 and the weft yarn 10B2 as described above, and may be replaced by a structure in which only the warp yarn and the weft yarn are overlapped.

In this case, the base 10B has the warp yarn 10B1 and the weft yarn 10B2, and the plurality of raised fiber bodies 30 penetrate the base body 10B and are formed in the thickness direction of the cushioning materials 10 and 20. Therefore, the warp yarn 10B1 extending in the Z direction, the weft yarn 10B2 extending in the X direction, and the raised fiber body 30 extending in the Y direction (the thickness direction of the cushioning members 10 and 20) are substantially orthogonal to each other in a three-dimensional configuration (i.e., X). , Y, Z orthogonal coordinate system). Further, since the raised fiber body 30 penetrates the base 10B, the intermediate portion of the raised fiber body 30 is surely held by the base 10B (FIGS. 2 to 4).

As a result, since most of the raised fiber bodies 30 exert an elastic effect toward the thickness direction of the cushioning members 10, 20, the cushioning properties of the cushioning members 10, 20 are improved.

The first felt layer 1A and the second felt layer 1B are attached to one surface (surface) and the other surface (back surface) of the base 10B by needle rolling. The third felt layer 1C is attached to the surface of the first felt layer 1A by needle rolling. The fourth felt layer 1D is attached to the surface of the second felt layer 1B by needle rolling.

The bonding means P is disposed on the surface of the third felt layer 1C and the surface of the fourth felt layer 1D, respectively. The joining means P is, for example, not extended Short-fiber and less base felt.

In addition, when the topsheet 1E is placed on the surface of the joining means P and is in a laminated state, the whole is subjected to thermocompression bonding, and the joining means P is melted. As a result, the third felt layer 1C and the surface layer 1E are firmly joined (joined) via the fusion bonding means P. Then, the fourth felt layer 1D and the surface layer 1E are firmly joined (joined) via the fusion bonding means P.

Here, a method of forming a plurality of raised fiber bodies 30 in the thickness direction of the cushioning materials 10 and 20 in order to penetrate the base body 10B with respect to the fiber body 30 will be described.

(sequence 1)

First, a woven fabric to be used as the base 10B is initially prepared. On the surface and the back surface of the woven fabric, a carded staple fiber web is laminated. Then, needle rolling is performed, and the interlacing treatment of the short fibers is performed on the woven fabric (base 10B). Thereby, the first felt layer 1A and the second felt layer 1B are laminated on one surface (surface) and the other surface (back surface) of the woven fabric (base body 10B).

In this needle rolling, a needle for needle rolling (hereinafter referred to as "needle") of 6 or less barbs (thorn) per one edge is used. The number of needle rolling is 50 times/cm ² or less. Further, the first barb of the knitting needle (the barb closest to the position viewed from the needle tip) is set at a position in contact with the surface of the woven fabric, and needle rolling is performed.

By this interlacing treatment, the axial direction of the short fibers is parallel to the woven fabric.

(sequence 2)

The above lamination operation is repeated until the first felt 1A and the second felt 1B reach a predetermined basis weight, respectively. Finally, when the first felt material 1A and the second felt material 1B have reached a predetermined basis weight, they are moved to the order of forming the raised fiber body 30.

(sequence 3)

This sequence uses a needle having a greater number of barbs (thorns) than the needle used in the above-described interlacing process (for example, a needle having 8 barbs or more per one edge). Then, a plurality of raised fiber bodies 30 are formed in the thickness direction of the cushioning members 10 and 20 by the knitting needles.

For example, a needle having a double-edge 18 barb is used, and the number of times of needle rolling is set to 80 times/cm ² or more. The knitting needle is set to the state where the last barb of the knitting needle (the barb located at the farthest position from the needle tip) is located at the position of the weaving.

When the needle rolling is performed in this state, the plurality of raised fiber bodies 30 are passed through the woven fabric (base body 10B) and formed in the thickness direction of the cushioning materials 10 and 20, and all the felt layers are joined. In response to this, the cushioning members 10, 20 having the plurality of raised fibrous bodies 30 are completed.

When the fineness of the short fibers is less than 1.0 dtex, the short fibers are easily pilling due to the needle rolling, and it is difficult to form the raised fibrous body 30. On the other hand, when the fineness of the short fibers exceeds 6.0 dtex, since the interlacing between the short fibers is weak, it is difficult to form the high-density raised fiber body 30, and the cushioning property of the cushioning material becomes weak.

Therefore, in the cushioning materials 10 and 20 of the present invention, the short fiber fineness of the raised fiber body 30 is preferably in the range of 1.0 to 6.0 dtex. In this case, since it is difficult to cause the short fibers to become the hair balls due to the needle rolling, the raised fiber bodies 30 can be easily formed. Further, since the interlacing between the short fibers is strong, the high-density raised fiber body 30 can be easily formed, and the cushioning properties of the cushioning members 10 and 20 become strong.

Further, in the present invention, heat-resistant short fibers having a fineness of 1.0 to 3.0 dtex are preferably used.

The cushioning materials 10 and 20 having the above-described configuration are suitable for use in the laminated plate forming and pressing device 1 of the apparatus for manufacturing a double-sided printed wiring board shown in Fig. 1, for example. Fig. 1 shows a laminated board which is a substrate of a double-sided printed wiring board, and is a laminated product.

[Examples]

Hereinafter, the heat-resistant cushioning material for press-forming of the present invention will be described in more detail using examples. In addition, the following examples are not intended to limit the invention in any way.

In the examples and comparative examples, the following structures were all used in common.

(1) Buffer material base:

As the cushioning material-based system, a woven fabric in which spun yarn of meta-type aromatic polyamide is woven is used. The fiber system of the woven fabric (trade name / Teijin Co., Ltd.).

(2) Needle rolling conditions: (a) Conditions for interleaving:

Using a needle having 6 barbs per one edge, the number of times of needle rolling was set to 50 times/cm ² , and the first barb of the knitting needle was set to a position contacting the surface of the woven fabric.

(b) Conditions for the formation of raised fibers:

In the examples, after the interlacing treatment, a needle having 18 barbs per two edges was used, the number of times of needle rolling was set to 80 times/cm ² , and the final barb of the knitting needle was set at a position penetrating through the woven fabric.

In the comparative example, after the interlacing treatment, the needle having 18 ribs and 18 barbs was used, and the number of times of needle rolling was set to 80 times/cm ² , and the first barb of the knitting needle was used. Set to the position where it touches the surface of the fabric.

(1) For the short fibers constituting the felt, the following examples were used for Examples 1 to 9 and Comparative Examples 1 to 5.

(a) Short-fiber use of meta-type aromatic polyamine (trade name / Teijin Co., Ltd.) 2dtex cut length 50mm short fiber.

(b) Polyphenylene terephthalamide (p) is used for the short fiber of the para-type aromatic polyamine ( , product name / DuPont company) 2dtex cut length 50mm short fiber.

(2) For the short fibers constituting the felt, the following examples were used for Examples 10 to 12 and Comparative Examples 6 and 7.

(a) Short-fiber use of meta-type aromatic polyamine (trade name / Teijin Co., Ltd.) 6dtex cut length 50mm short fiber.

(b) Polyphenylene terephthalamide (p) is used for the short fiber of the para-type aromatic polyamine ( , trade name / DuPont company) 5dtex cut length 50mm short fiber.

(Example 1)

On the surface and the back surface of the woven fabric, a cotton web formed of short fibers of polyparaphenylene terephthalate and phenylenediamine is laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 1 was obtained.

(Example 2)

Laminated on the surface and back of the woven fabric The short fiber forms the cotton web. Then, pinching was performed to form the first felt layer 1A and the second felt layer 1B, respectively, and the cushioning material of Example 2 was obtained.

(Example 3)

On the surface of the woven fabric (the side on the side of one hot plate 40), a short fiber of polyparaphenylene terephthalamide is formed into a mesh and laminated on the back side of the woven fabric (the back side of one of the hot plates 40) ),will The short fibers form a mesh and are laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 3 was obtained.

(Example 4)

On the surface of the woven fabric (the surface on the side of one hot plate 40), 50% by weight of short fibers of polyparaphenylene terephthalamide and 50% by weight of carbon fibers were mixed to form a network and laminated. On the back of the woven fabric (the side of the back side of a hot plate 40), 50% by weight of the short fibers and 50% by weight of the carbon fibers were subjected to a kneading treatment to form a net and laminated.

Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 4 was obtained.

(Example 5)

On the surface of the woven fabric (the side of one of the hot plates 40) The short fibers form a web and are laminated, and the short fibers of polyparaphenylene terephthalamide are formed on the back surface of the woven fabric (the side of the back side of one of the hot plates 40) and laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 5 was obtained.

(Example 6)

The short fibers of polyparaphenylene terephthalamide are formed into a cotton web on both the surface and the back surface of the woven fabric and laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 6 was obtained. In this Example 6, the areal density of the short fibers was increased as compared with Example 1.

(Example 7)

On the surface of the cushioning material prepared in Example 1, The short fibers form a mesh and are laminated. Then, pinching was performed to form the third felt layer 1C and the fourth felt layer 1D, respectively, to obtain the cushioning material of Example 7.

(Example 8)

On the surface of the cushioning material prepared in Example 2, the short fibers of polyparaphenylene terephthalamide were formed into a network and laminated. Then, the third felt layer 1C and the fourth felt layer 1D were formed by needle rolling, and the cushioning material of Example 8 was obtained.

(Example 9)

On the surface of the cushioning material obtained in Example 7, the ETFE film was further bonded to the surface of the cushioning material via a glass epoxy, and the cushioning material of Example 9 was obtained.

(Embodiment 10)

The short fibers of polyparaphenylene terephthalamide are formed on the surface of the woven fabric (the side on the side of one hot plate 40) and laminated, and on the back side of the woven fabric (the back side of one of the hot plates 40) Admiral The short fibers form a mesh and are laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 10 was obtained.

(Example 11)

On the surface of the woven fabric (the surface on the side of one hot plate 40), 50% by weight of short fibers of polyparaphenylene terephthalamide and 50% by weight of carbon fibers were mixed to form a network and laminated. On the back of the woven fabric (the side of the back side of a hot plate 40), 50% by weight of the short fibers and 50% by weight of the carbon fibers were subjected to a kneading treatment to form a net and laminated.

Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Example 11 was obtained.

(Embodiment 12)

The cushioning material of Example 12 was bonded to the surface of the cushioning material prepared in Example 10, and the ETFE film was bonded to the prepreg with glass epoxy.

(Comparative Example 1)

On the surface and the back surface of the woven fabric, short fibers of polyparaphenylene terephthalamide and p-phenylenediamine are respectively formed into a cotton web and laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Comparative Example 1 was obtained.

(Comparative Example 2)

On the surface and back of the woven fabric, respectively The short fibers form a cotton web and are laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Comparative Example 2 was obtained.

(Comparative Example 3)

The short fibers of polyparaphenylene terephthalamide are formed on the surface of the woven fabric (the side on the side of one hot plate 40) and laminated, on the back side of the woven fabric (the side of the back side of one of the hot plates 40) Admiral The short fibers form a mesh and are laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Comparative Example 3 was obtained.

(Comparative Example 4)

On the surface of the woven fabric (the surface on the side of one hot plate 40), 50% by weight of short fibers of polyparaphenylene terephthalamide and 50% by weight of carbon fibers were used to form a network and laminated. On the back of the woven fabric (the side of the back side of a hot plate 40), 50% by weight of the short fibers and 50% by weight of the carbon fibers were subjected to a kneading treatment to form a net and laminated.

Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Comparative Example 4 was obtained.

(Comparative Example 5)

The cushioning material of Comparative Example 5 was obtained by bonding the ETFE film to the surface of the cushioning material prepared in Comparative Example 3 via a glass epoxy prepreg.

(Comparative Example 6)

On the surface of the woven fabric (on the side of a hot plate 40 side), the short fibers of polyparaphenylene terephthalamide are formed into a mesh and laminated on the back side of the woven fabric (the back side of one of the hot plates 40) ), will The short fibers form a mesh and are laminated. Then, the first felt layer 1A and the second felt layer 1B were formed by needle rolling, and the cushioning material of Comparative Example 6 was obtained.

(Comparative Example 7)

The cushioning material of Comparative Example 7 was obtained by bonding the ETFE film to the surface of the cushioning material prepared in Comparative Example 6 and further by a glass epoxy prepreg.

With respect to the samples of the cushioning materials prepared by the above Examples and Comparative Examples, a test apparatus having the same configuration as that of the forming press-bonding apparatus 1 shown in Fig. 1 was used and tested. Thereby, the performance measurement of each cushioning material was performed.

The sample of the relevant cushioning material was set to one cycle in a series of steps of "temperature at 190 ° C, pressure of 40 kg/cm ² for 60 minutes, and then water cooling for 15 minutes and pressurization for 15 minutes". Then, the relevant sample was subjected to the measurement of the following items by repeating the series of 300 cycles and repeating the sample 300 times.

(1) Measurement of heating rate (°C/min):

The time until the buffer material sample was changed from 90 ° C to 140 ° C was measured, and the temperature increase rate (° C/min) was obtained.

The evaluation of the heating rate is such that the sample heating rate exceeds 1.8 ° C / min and the temperature below 2.2 ° C / min is rated as " ◎", which will exceed 1.5 ° C / min and below 1.8 ° C / min, and above 2.2 ° C / min and in Those below 2.5 °C/min were rated as "○" and the rest were rated as "X" (Fig. 5).

(2) Measurement of buffer displacement (μm):

The sample of the cushioning material was measured in the state of being heated to 180° C., and the thickness of the cushioning material sample at the time of performing the press-forming at 50 kg, and the thickness of the cushioning material sample at the time of performing the press-forming at 50 kg. Then, the difference between the thickness at the time of press-forming at 50 kg and the thickness at the time of press-forming at 0.2 kg was determined, and the difference was defined as the amount of buffer displacement (μm).

The evaluation of the buffer displacement amount was rated as "◎" for those with a sample buffer displacement of 500 μm or more, "○" for those of 400 μm or more and less than 500 μm, and "×" for those of less than 400 μm (Fig. 5).

Fig. 5 shows the physical properties of the cushioning material samples obtained from the examples and the comparative examples, and the cushioning material sample performance table measured by the above test apparatus.

As is apparent from Fig. 5, the samples of the examples of the present invention were better than the samples of the comparative examples in both the temperature rise rate evaluation and the buffer displacement amount evaluation. Therefore, it was confirmed that the cushioning material of the present invention is easy to adjust the temperature increase rate, and the cushioning property is excellent.

Further, the buffer material density according to various embodiments of the present invention is the minimum value (0.30 g/cm ³ ) in Example 11, and the maximum value (0.49 g/cm ³ ) in Example 9. Therefore, it is known that the density of the cushioning material of the present invention is preferably from 0.3 g/cm ³ to 0.5 g/cm ³ .

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications, additions, and the like can be made without departing from the spirit and scope of the invention.

In addition, the same symbols in the respective drawings denote the same or corresponding parts.

(industrial availability)

The heat-resistant cushioning material for forming press-bonding of the present invention can be applied to a manufacturing step of a substrate of a printed wiring board, a printed wiring board, a flat panel display, and a semiconductor package.

1. . . Forming press

1A. . . First felt layer

1B. . . 2nd felt layer

1C. . . 3rd felt layer

1D. . . 4th felt layer

1E. . . Surface material

10. . . First cushioning material

10B, 11B, 21B. . . Matrix

10B1, 11B1, 21B1. . . Warp

10B2, 11B2, 21B2. . . Weft

11A. . . Felt layer

20. . . Second cushioning material

21A‧‧‧Short fiber mat layer

30‧‧‧Flocking body

40‧‧‧ hot plate

50‧‧‧Mirror panel

60‧‧‧ copper foil

70‧‧‧Prepreg

C‧‧‧ cushioning material

C4, C5‧‧‧ Heat-resistant cushioning material for forming press

P‧‧‧ joining means

Fig. 1 is a cross-sectional view showing a molding press of a laminated board in a manufacturing apparatus for a double-sided printed wiring board.

Fig. 2 is a cross-sectional view showing a heat-resistant cushioning material for forming press-bonding according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view showing a heat-resistant cushioning material for forming press-bonding according to another embodiment of the present invention.

Fig. 4 is an enlarged cross-sectional view showing the heat-resistant cushioning material for press forming shown in Fig. 2;

Figure 5 is a table showing the physical properties and properties of a buffer material sample.

Fig. 6 is a cross-sectional view showing a conventional heat-resistant cushioning material for press forming.

Fig. 7 is a cross-sectional view showing a conventional heat-resistant cushioning material for press forming.

1A‧‧‧1st felt layer

1B‧‧‧2nd felt layer

1C‧‧‧3rd felt layer

1D‧‧‧4th felt layer

10‧‧‧1st cushioning material

10B‧‧‧ substrate

10B1‧‧‧ warp yarn

10B2‧‧‧ Weft

30‧‧‧Flocking body

Claims (5)

A heat-resistant cushioning material for forming press-bonding is used for manufacturing a laminated product by a molding press-bonding device (1), and a heat-resistant cushioning for forming press-bonding by laminating a substrate (10B) and a felt layer (1A, 1B, 1C, 1D) The material (10, 20) is characterized in that the buffer material (10, 20) is provided with one or two layers of heat-resistant short fibers (staple) on one side and the other side of the base body (10B). The above-mentioned felt layer (1A, 1B, 1C, 1D); the above-mentioned felt layer (1A, 1B, 1C, 1D) is composed of short fibers of para-type aromatic polyamine and para-aromatic a composite short fiber in which short fibers of polyamine are mixed; a state in which the knitting needle is set to the last barb of the knitting needle (the barb located at the farthest position from the needle tip) is located at a position penetrating the base body (10B) Further, in the cushioning material (10, 20), a plurality of raised fiber bodies (30) composed of short fibers having a fineness of 1.0 to 10.0 dtex penetrate the base body (10B) and are formed in the cushioning material (10). And 20) in the thickness direction, and the above-mentioned felt layer (1A, 1B) of the first layer is respectively connected to the base body (10B), from the plural Fibrous body (30) based at least three fiber bundles was napped collection, by raising the bundle fiber body by the buffer member 5 of at least a top beam system configuration / cm ^2, of the complex fluffing fibrous body (30) of said cushion member (10, 20) The thickness direction exerts an elastic effect. The heat-resistant cushioning material (10, 20) for forming press-bonding according to the first aspect of the invention, wherein the raised fiber body (30) is a heat-resistant short fiber having a fineness of 1.0 to 6.0 dtex, and inter-fiber interlacing is performed by needle rolling. form. The heat-resistant cushioning material (10, 20) for forming press-bonding according to the first aspect of the invention, wherein the buffer material (10, 20) has a density of 0.3 g/cm ³ to 0.5 g/cm ³ . The heat-resistant cushioning material (20) for forming press-bonding according to the first aspect of the patent application, wherein the surface layer (1E) is laminated on the surface of the cushioning material (20). The heat-resistant cushioning material (20) for forming press-bonding according to the fourth aspect of the invention, wherein the surface layer (1E) is a cover film, a metal foil, or a heat-resistant resin having mold release properties.