KR20180111524A - Cushioning material for hot press and method for producing the same - Google Patents

Abstract

Provided is a cushioning material for hot press, which is newly modified by suppressing fluff in use and having excellent releasability from heat plate and transferability for automatic loading. Moreover, provided is a method for producing the cushioning material for hot press. According to the present invention, the cushioning material for hot press comprises: a base material; a bat fibrous layer whose external surface disposed on a first major surface of the base material is softened and smoothed; and an airtight sheet layer disposed on a second major side of the base material. The airtight sheet layer is composed of a fiber sheet or a resin film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for a hot press,

The present invention relates to a heat-press cushioning material and a method of manufacturing the cushioning material for hot press.

BACKGROUND ART [0002] Generally, in the production of an electrical component having a laminated structure such as printed wiring, a liquid crystal display panel and the like, and a building material having a laminated structure such as a laminate, an decorative sheet and a builder, A hot press is performed for the purpose of press molding or thermocompression bonding.

For example, a printed wiring board is manufactured by laminating a prepreg made of resin and a copper foil, and then pressing and heating, i.e., hot pressing, with a heat board . In the hot press, the prepreg is gradually heated by the viscosity, once it returns to the liquid state, and then hardening proceeds gradually. In such a hot press, it is required that the pressure and the temperature distribution applied to the laminate are uniform.

For this purpose, a cushioning pad for hot pressing is generally used in a hot press. The cushioning pad for hot pressing is disposed between the heating plate and the laminate, and the pressure and temperature distribution of the hot press can be made uniform by dispersing the pressure and temperature loaded in the heating plate in the lateral direction. Therefore, a cushion for hot pressing is required as a basic performance in order to equalize the pressure distribution and the temperature distribution, such as proper deformation followability, cushioning property, thermal conductivity, and high durability (for example, heat resistance).

Patent Document 1 discloses an unstretched meta-based aromatic polyamide fiber or a web containing the above-mentioned fibers on the whole or whole surface of a substrate made of a meta-aromatic polyamide, And a heat-resistant cushioning material which is heat-treated at a temperature not lower than the glass transition point of the meta-based aromatic polyamide fiber.

Patent Document 2 discloses a heat-resistant cushioning material in which an airtight layer made of heat-resistant fibers is formed on the surface of a body made of heat-resistant fibers.

Patent Document 3 discloses a nonwoven fabric comprising a first nonwoven fabric constituting an inner layer and a second nonwoven fabric disposed on both sides of the first nonwoven fabric and constituting an outer layer, wherein the second nonwoven fabric has a weight per unit area ) Of 80 to 400 g / m < ² > is used, and the first nonwoven fabric uses fibers having higher rigidity than the aramid fibers of the copolymer type as the constituent material thereof, The second nonwoven fabric and the second nonwoven fabric have a heat-resistant temperature of 270 DEG C or higher, respectively.

[Patent Document 1] JP-A-6-91780 [Patent Document 2] JP-A-8-169074 [Patent Document 3] JP-A-2014-37654

However, in order to smoothly carry out the hot pressing process, the cushioning pad for hot pressing generally requires good peel-off property with the heat bar. Further, at the time of using the cushioning material for hot pressing, it is necessary to suppress the fluff of the constituting fiber material and the detachment (hair loss) accompanying thereto. If hair loss occurs, the detached fiber material may be mixed into the laminate and adversely affect the final product.

On the other hand, there is a case where the cushioning pad for hot pressing is automatically loaded for the purpose of automating the hot pressing process. In such automatic loading, the cushioning material for hot pressing is lifted and conveyed and carried by suctioning and holding the cushioning material for hot pressing. Here, the cushioning pad for hot pressing tends to be lightweight recently, and therefore, also in the automatic stacking apparatus, there is a tendency to perform sucking with a weak suction force as compared with the conventional one. Therefore, the cushioning pad for hot pressing is required to have a good conveying ability that can be automatically loaded even with a weak suction force as compared with the conventional one.

Here, as described in Patent Documents 1 and 3, a hot press cushion having a fiber layer and a nonwoven fabric layer as surface layers does not have a sufficient conveying property corresponding to such recent automatic conveying tendency. On the other hand, in the case where the airtight layer is provided as described in Patent Document 2, the releasability from the nirvana is not sufficient. As described above, the cushioning pad for thermal press described in the above Patent Documents 1 to 3 does not simultaneously satisfy the above-mentioned performance.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a new and improved cushioning pad for heat pressing and a cushioning pad for heat transfer, which are excellent in the transportability of automatic loading, And a method of manufacturing the cushioning pad for press.

According to one aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising the steps of: forming a base material, a vat fiber layer disposed on a first main surface of the base material and having an outer surface softened smoothed, There is provided a cushion for a hot press having an airtight sheet layer disposed on a second main surface side of the cushion.

The bat fiber layer may be softened and smoothed at a temperature not lower than the glass transition temperature of the bat fiber including the bat fiber.

According to another aspect of the present invention, there is provided a method of manufacturing a magnetic recording medium having a base material, a bat fiber layer disposed on a first main surface of the base material, and an airtight sheet layer disposed on a second main surface side of the base material, The outer surface of the bat fiber layer is provided with a cushioning material for hot pressing, wherein at least a portion of the outer surface is made of fibers that are flattened along the outer surface.

The airtight sheet layer may be composed of a fiber sheet or a resin film.

The surface roughness Ra of the outer surface of the bat fiber layer may be 2.5 to 11 mu m.

The air permeability according to the shape of the Frazier specified in JIS L 1096 may be 0.2 cm ³ / cm ² / sec or less.

The bat fiber layer may include an unoriented meta-based aromatic polyamide fiber.

The fineness of the bat fibers constituting the bat fiber layer may be 0.8 to 11 dtex.

The cushioning pad for hot pressing may also have a bat fiber layer disposed between the substrate and the airtight sheet layer.

The substrate may comprise aromatic polyamide fibers.

According to another aspect of the present invention, there is provided a method of manufacturing a base material, comprising the steps of disposing bat fibers on at least one main surface of a base material and performing needling, To form a laminate,

There is provided a method of producing a cushioning pad for hot pressing, which comprises pressing the cushioning material at a temperature equal to or higher than the glass transition temperature of the bat fiber in a state in which the airtight sheet is disposed on the other main side surface of the base material in the laminate.

INDUSTRIAL APPLICABILITY As described above, the present invention provides a new and improved cushioning pad for heat pressing and a cushioning pad for hot press, which are excellent in carrying properties and releasability from a heat pad in automatic loading, .

1 is a schematic view showing an example of a use state of a cushioning pad for hot pressing according to an embodiment of the present invention.
2 is a schematic view showing an example of a use state of a cushioning pad for hot pressing according to an embodiment of the present invention.
3 is a sectional view of a cushioning pad for hot pressing according to an embodiment of the present invention.
4 is a sectional view of a cushioning pad for hot pressing according to a modification of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 1 and 2 are schematic views showing an example of a use state of a cushioning pad for hot pressing according to an embodiment of the present invention, and Fig. 3 is a sectional view of a cushioning pad for hot pressing according to an embodiment of the present invention. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. In addition, the components of each figure are emphasized appropriately for ease of explanation, and the size of the figures does not indicate actual size.

<1. Heat Press>

First, prior to the description of the cushioning material for hot pressing, an example of a hot press using the cushioning material for hot pressing according to the embodiment of the present invention will be described. It should be noted that the object to be subjected to hot pressing in this embodiment is a laminate 300 as a precursor of a printed wiring board.

As shown in Fig. 1, the hot press is achieved by pressing the laminates 300 with a pair of upper and lower heated nirvits 100. In addition, as shown in Fig. 1, a hot press can be performed for various laminate plates 300 at the same time.

2, a metal foil 302 such as a copper foil is disposed on both sides of the prepreg 301 in the laminated board 300. As shown in Fig. The prepreg 301 is formed by laminating a plurality of sheets in a semi-cured state in which a glass cloth is impregnated with a thermosetting resin.

A mirror-surface plate 200 such as a stainless plate is disposed between the various laminate plates 300 so as not to directly contact them and to form a surface. In order to avoid direct contact with the cushioning pad 1 for heat press and the cushioning member 100 and also below the laminated plate 300 existing at the upper and lower ends of the laminate 300 located at the upper end, The mirror mirror plate 200 is disposed.

The object to be pressed laminated with the laminated plate 300 and the mirror-surface plate 200 is pressed by the nirvana 100 through the cushioning material 1 for hot pressing arranged above and below. Here, the cushioning pad 1 for hot pressing has appropriate thermal conductivity, strain following property, and cushioning property, and the pressure and heat in the nirvana 100 are uniformly applied to the object to be pressed laminated with the laminated plate 300 and the mirror- It has the function of transferring.

The conventional cushioning pad for hot pressing has a problem in carrying performance due to automatic loading, releasability from a heat plate, and fluff in use. However, in the cushioning pad for hot pressing 1 according to the present embodiment, can do.

<2. Cushioning material for hot press>

Next, the cushioning pad for hot pressing according to the present embodiment will be described.

The cushioning pad 1 for hot pressing shown in Fig. 3 is used for the production of an electric component having a laminated structure such as a printed wiring board, or more specifically, a molding press. The cushioning pad for hot pressing 1 comprises a substrate 10, a first bat fiber layer 20 disposed on one main surface (first main surface) of the substrate 10, And the airtight sheet layer 40 disposed on the side opposite to the base 10 side of the second bat fiber layer 30 and the second bat fibrous layer 30 disposed on the second main surface.

The base material 10 is a main body of the cushioning material for hot pressing 1 and is a layer exhibiting basic performance as a cushioning material 1 for hot pressing such as thermal conductivity, The substrate 10 has a ground fabric 12 and a felt layer 14.

The bubble 12 is a fiber-reinforced base material which contributes to maintenance of tensile strength and shape stability in the cushioning material 1 for hot pressing. Although not particularly limited, the bubble 12 may be made of, for example, a fabric or a lattice material. When the bubble 12 is a woven fabric, the structure of the woven fabric is not particularly limited, but may be plain fabric, twill weave, satin, or multiple yarns using them. As the lattice-like material, for example, warp yarns and weft yarns may be used. As the constituent material of the bubble 12, for example, a meta-based aromatic polyamide, a para-aromatic polyamide, a wholly aromatic polyester fiber, poly-p-phenylenebenzobisoxazole (PBO) Stainless steel fibers and the like can be appropriately selected. The bubbles 12 can be appropriately omitted according to the specifications of the cushioning pad 1 for hot pressing.

The felt layer 14 is disposed on both sides of the bubble 12. The felt layer 14 is a fibrous aggregate layer formed by bonding short fibers together and exhibits basic performance with the cushioning material 1 for hot pressing such as thermal conductivity, strain followability and cushioning property in the cushioning material 1 for hot pressing.

The felt layer 14 is formed by placing a fibrous web made of batt fibers as short fibers on the bubble 12 and bonding them to each other by needle punching, .

The material constituting the felt layer 14 is not particularly limited, but is preferably composed of a resin material having heat resistance, for example, an aromatic polyamide. For example, a meta-based aromatic polyamide and / An aromatic polyamide can be used. Specifically, a staple fiber composed of the above-described material can be used as the bat fiber. That is, the felt layer 14 of the substrate 10 preferably comprises aromatic polyamide fibers. More specifically, meta-based aromatic polyamide fibers (manufactured by Conex (trade name / Teijin) and nomex (trade name / manufactured by Dupont)) mainly containing poly-m-phenylene-isophthalamide, , Para-aromatic polyamide fibers (Kevlar (trade name / Dupont) and technora (trade name / Teijin)) mainly containing polyparaphenylene terephthalamide and the like, PPS fibers (tor- / Toray)) may be used alone or in combination of two or more.

The fiber length of the short fibers constituting the felt layer 14 is not particularly limited, but may be, for example, 38 to 130 mm. The fineness of the staple fibers constituting the felt layer 14 is not particularly limited, but may be 0.8 to 11 dtex, for example.

The weight per unit area of the felt layer 14 may be selected according to the use of the cushioning pad 1 for hot pressing and is not particularly limited. For example, Layer is 300 to 2700 g / m &lt; ² &gt;, preferably 1000 to 2200 g / m &lt; ^{2 &} gt ;. Therefore, appropriate thermal conductivity and strain followability can be obtained.

The first bat fiber layer 20 is disposed on one main surface of the base material 10 and constitutes a surface layer of the cushioning material 1 for hot pressing. Further, the first bat fiber layer 20 is disposed on the side of the cushioning pad 1 that is in contact with the heat bar when the cushion pad 1 is used.

The first bat fiber layer 20 is formed by softening and smoothening the outer surface of the bat fiber layer formed at the same time while bonding the bat fibers by needle punching. Thus, the outer surface 21 of the first batt fibrous layer 20 is composed of fibers that are at least partially flattened along the outer surface 21.

This softening smoothing can be performed by treating the bat fibers constituting the first bat fiber layer 20 at a temperature equal to or higher than the glass transition temperature. In the softening smoothing, it is preferable to press the outer surface 21 of the first bat fiber layer 20 with a nirvana or the like while maintaining the temperature.

As such, the outer surface 21 is softened and smoothed so that the bat fibers in the vicinity of the outer surface 21 are adhered to each other to be self-adhered or to be stuck in a space where other fibers are formed. So that napping of the bat fibers at the outer surface 21 is prevented. Further, hair loss is prevented in the first bat fiber layer 20.

Further, the outer surface 21 of the first bat fiber layer 20 is properly densified by softening and smoothening, thereby lowering the air permeability of the cushioning pad 1 for hot pressing. Accordingly, the air permeability of the hot-press cushioning material 1 together with the air-tightness sheet layer 40 described later becomes sufficiently low, and the conveyability of the automatic cushioning material 1 for hot pressing is improved. Further, since the outer surface 21 is densified, the cushioning pad 1 for hot pressing can be sucked, held and transported by the suction device of the automatic loading device at the side of the first batt fibrous layer 20.

On the other hand, since the outer surface 21 of the first bat fiber layer 20 is made of bat fibers even though it is smoothed, it has an appropriate surface roughness and is excellent in peelability between the first bat fiber layer 20 and the nirvana . Therefore, the cushioning pad 1 for hot pressing is excellent in peelability from the nirvana.

The surface roughness Ra of the outer surface 21 of the first bat fiber layer 20 is not particularly limited, but is, for example, 2.5 to 11 μm, preferably 3 to 8 μm, more preferably 4 to 7 μm. If the surface roughness Ra of the outer surface 21 of the first bat fiber layer 20 is not lower than the lower limit described above, the peeling property of the cushioning pad 1 for thermal press can be further improved. Further, when the surface roughness Ra of the outer surface 21 of the first bat fiber layer 20 is not more than the upper limit value, the conveyability of the automatic cushioning material 1 for hot pressing can be further improved. In the present specification, the surface roughness Ra can be measured according to JIS-B0633.

As described above, the outer surface 21 of the first bat fiber layer 20 is made up of at least a part of the bat fibers having a flat shape along the outer surface 21.

Here, the degree of flatness of the bat fibers can be defined by the aspect ratio of the cross-section of the bat fibers constituting the outer surface 21. Specifically, the aspect ratio of the bat fibers (the diameter in the plane direction of the hot press cushioning material 1 / the diameter in the thickness direction of the hot press cushioning material 1) when the cross section in the thickness direction of the first bat fiber layer 20 is observed ) Can be an average of.

The aspect ratio is not particularly limited, but is, for example, 1.2 to 3.0, preferably 1.5 to 2.5.

The bat fiber constituting the first bat fiber layer 20 is not particularly limited as long as it is capable of softening smoothing as described above. For example, non-stretchable fibers, preferably unoriented aromatic polyamide fibers, A neat meta-based aromatic polyamide fiber can be used. These unstretched fibers are relatively easily deformed by the softening smoothing treatment as compared with the fibers subjected to the stretching treatment, and are advantageous for forming the outer surface 21 as described above.

As the bat fiber, in addition to the above-mentioned unstretched fibers, fibers subjected to stretching treatment may be used. Such fibers include various fibers that can be used for the felt layer 14 described above. In this case, the weight ratio of the unstretched fibers in the first bat fiber layer 20 is, for example, 70% by mass or more, preferably 80% by mass or more, and more preferably 100% by mass.

The fineness (average) of the bat fibers constituting the first bat fiber layer 20 is not particularly limited, but is, for example, 0.8 to 11 dtex, preferably 2 to 6 dtex. The outer surface 21 after the softening smoothing treatment can be made even smoother because the fineness of the bat fiber is the lower limit value or more. On the other hand, since the fineness of the bat fibers is not more than the upper limit value, the number of fibers can be increased and the outer surface 21 can be made dense.

The weight per unit area of the first bat fiber layer 20 is not particularly limited, but is, for example, 80 to 200 g / m ² , preferably 100 to 150 g / m ² . When the weight per unit area of the first bat fiber layer 20 is not more than the lower limit value, depending on the material composition of the cushioning pad 1 for hot pressing, the first bat fiber layer 20 is easily affected by the surface shape of the base material 10 As a result, the surface smoothness of the first bat fiber layer 20 may be lowered. On the other hand, when the weight per unit area of the first bat fiber layer 20 exceeds the upper limit value, the first bat fiber layer 20 does not largely contribute to the cushioning property. Therefore, depending on the construction of the cushioning pad 1 for hot pressing, The cushioning property may be lowered as compared with the case where the first batt fibrous layer 20 is not present.

2, the cushioning pad 1 for hot pressing is disposed such that the outer surface 21 of the first bat fiber layer 20 on the side of the heat bar 100 is generally opposed. As a result, the peeling property between the heat bar 100 and the cushioning pad 1 for hot pressing can be made excellent.

The second bat fiber layer 30 is disposed on the main surface of the substrate 10 opposite to the first bat fiber layer 20 side. The second bat fiber layer 30 is formed by bonding the bat fibers by needle punching.

The batt fibers constituting the second bat fiber layer 30 are not particularly limited, but various fibers usable for the non-stretched fibers and the felt layer 14 described above can be used. Particularly, when the second bat fiber layer 30 comprises non-drawn fibers, preferably unoriented aromatic polyamide fibers, and more preferably unoriented meta-based aromatic polyamide fibers as bat fibers, The adhesion is further enhanced.

The fineness (average) of the bat fibers constituting the second bat fiber layer 30 is not particularly limited, but is, for example, 0.8 to 11 dtex, preferably 2 to 6 dtex.

The weight per unit area of the second bat fiber layer 30 is not particularly limited, but is, for example, 80 to 200 g / m ² , preferably 100 to 150 g / m ² .

One reason for disposing the second batting fibrous layer 30 is to prevent the occurrence of warpage caused by repeated use of the cushioning pad 1 for hot pressing. That is, in the cushioning pad 1 for hot pressing, contraction difference occurs on the side of the first batt fibrous layer 20 and the side of the second batt fibrous layer 30 of the cushioning pad 1 for hot pressing by the heat of repetitive press forming, The cushioning pad 1 for press can be bent. From the viewpoint of preventing warping of the cushioning pad 1 for hot pressing, it is more preferable that the second bat fiber layer 30 has the same structure as the first bat fiber layer 20.

The airtight sheet layer 40 is disposed on the side opposite to the side of the substrate 10 of the second bat fiber layer 30. The airtight sheet layer 40 is made of a fibrous sheet or a resin film so that it is brought into close contact with the second bat fiber layer 30 and at the same time maintains high airtightness and contributes to lowering the air permeability of the cushioning pad 1 for hot pressing. Therefore, the cushioning pad 1 for hot pressing is attracted and held by the suction device even when the cushioning material 1 is relatively weakly attracted at the time of automatic loading, in addition to the airtightness of the outer surface 21 of the first bat fiber layer 20 described above. That is, the cushioning pad 1 for hot pressing has excellent conveyability at the time of automatic loading.

The airtight sheet layer 40 is formed by thermally pressing or thermally fusing a fibrous sheet or a resin film to the second batt fibrous layer 30. The fibrous sheet may be, for example, a paper-like sheet produced by papermaking, that is, a wet nonwoven fabric or the like. The material of the fiber constituting the fiber sheet is not particularly limited, but it is preferable that it is made of a resin material having heat resistance, for example, an aromatic polyamide, for example, a meta-based aromatic polyamide and / Polyamide can be used. The resin film is not particularly limited and examples thereof include a fluororesin film, specifically, an ethylene-tetrafluoroethylene copolymer (ETFE), a tetrafluoroethylene / hexafluoropropylene copolymer ethylene / hexafluoro propylene copolymer (FEP), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride, and perfluoroalkoxy alkane. PFA) may be used.

The surface roughness Ra of the airtight sheet layer 40 is not particularly limited, but is, for example, 2 to 7 占 퐉, preferably 4 to 6 占 퐉. The vacuum state of the aspirator and the outer surface 41 can then be kept good when the outer surface 41 of the fiber sheet layer 40 is sucked into the aspirator by the suction surface during the automatic loading device.

The basis weight of the airtight sheet layer 40 is not particularly limited, but is, for example, 40 to 80 g / m ² , preferably 50 to 70 g / m ² .

The thickness of the airtight sheet layer 40 is not particularly limited, but is, for example, 25 to 200 占 퐉, preferably 50 to 100 占 퐉.

The air permeability of the cushioning pad 1 for hot pressing according to the above-described configuration in the form of a fraser specified in JIS L 1096 is not particularly limited, but may be 1.0 cm ³ / cm ² / sec or less, preferably 0.2 cm ³ / cm ² / sec or less, and more preferably 0.0 cm ³ / cm ² / sec. As a result, the carrying performance of the automatic loading of the cushioning pad 1 for hot pressing can be further improved. The lower limit of the air permeability is not particularly limited, but may be, for example, 0 cm ³ / cm ² / sec. If the air permeability of the cushioning pad for hot pressing is 0.3 cm ³ / cm ² / sec or more, a problem may occur in automatic conveyance depending on the configuration of the automatic loading device to be used.

The density of the cushioning pad 1 for hot pressing is not particularly limited, but is, for example, 0.3 to 0.7 g / cm 3, preferably 0.4 to 0.6 g / cm ³ . Therefore, the thermal conductivity of the cushioning pad 1 for hot pressing is stable (difference in thermal conductivity is small) during the hot press from the beginning to the end of use, and excellent cushioning is continued.

The thickness of the cushioning pad 1 for hot pressing is not particularly limited, but is, for example, 1 to 8 mm, preferably 2 to 6 mm.

The dimensions of the cushioning pad 1 for hot pressing are not particularly limited and may be suitably set by the application and the thermal head to be used. For example, the length in the longitudinal direction and the width direction may be 3.6 x 1.3 m.

The cushioning pad 1 for hot pressing as described above is such that the outer surface of the first bat fiber layer 20 is softened and smoothed so that fluff of the bat fiber is prevented on the outer surface 21. [ On the other hand, since the first bat fiber layer 20 is composed of bat fibers, the cushioning pad 1 for hot pressing is excellent in releasability from the nirvana.

The airtightness of the cushioning pad 1 for hot pressing is low because the cushioning pad 1 for hot pressing has the airtightness sheet layer 40 and the airtightness of the outer surface 21 of the first batting fiber layer 20 Together, the cushioning pad 1 for hot pressing is sucked and held by the suction device even when the suction force is relatively weak at the time of automatic loading. That is, the cushioning pad 1 for hot pressing has excellent conveyability at the time of automatic loading. Further, the cushioning pad 1 for hot pressing is excellent in conveyability even when it is suctioned from the outer surface 21 side as well as automatically conveyed from the outer surface 41 side. In particular, recently, cushioning materials for hot pressing tend to be lightweight in general, and therefore, even in the automatic loading apparatus, the cushioning material tends to be attracted by a weak suction force as compared with the conventional one. For example, Patent Document 1 discloses that suction is performed under the condition of 500 mmH ₂ O. At present, suction is performed at a degree of vacuum of, for example, about 50 to 100 mm. After reaching a predetermined degree of vacuum according to the aspirator, the suction is stopped. Even in this case, the cushioning pad 1 for hot pressing can be easily sucked and held by the suction device of the automatic loading device.

As described above, the cushioning pad 1 for hot pressing is used for the production of an electric component (laminated product) having a laminated structure such as a printed wiring board, or more specifically, a molding press. For example, an example of a laminated product is as follows. There are various products besides the examples shown below in the laminated product.

(1) Laminate that becomes a basal plate of a printed wiring board:

Examples of the laminated board include a glass epoxy laminate in which a layer made of kraft paper and a phenol resin is formed of a phenol laminate or a glass fiber fabric and an epoxy resin.

(2) Printed circuit board:

Examples of the printed wiring board include a single-sided printed wiring board on which a conductor pattern is formed on one side of a substrate, a double-sided printed wiring board on which conductor patterns are formed on both sides of the substrate and a multilayer printed wiring board on which conductor patterns are formed, .

(3) Flat panel display:

The flat panel display includes, for example, a liquid crystal display, electroluminescence, and the like.

(4) Semiconductor package:

As the semiconductor package, for example, a chip size package (CSP) having almost the same size as that of the chip can be cited.

The cushioning material for hot pressing according to the present invention can be used not only for the above-mentioned purposes but also for the production of a material having a laminated structure such as a laminate, a veneer, and a builder. In this case, the cushioning pad for hot pressing according to the present invention can be appropriately changed in configuration depending on the use.

<3. Method of producing cushioning material for hot press>

Next, a manufacturing method of the cushioning pad 1 for hot pressing according to the present invention will be described as an example.

A method of manufacturing a cushioning pad for hot pressing according to the present invention comprises the steps of placing a bat fiber on at least one main surface of a base material and performing needling to form a bat fiber layer on at least one main surface of the base material to obtain a laminate, And a step of pressing at a temperature equal to or higher than the glass transition temperature of the bat fiber while the airtight sheet is disposed on the other main surface side of the base material according to the laminate.

In the present embodiment, the base material (10) is prepared in advance of the step of obtaining the laminate. The base material 10 is formed by placing a fibrous web made of bat fibers as short fibers in the above-described bubble 12 on the bubble 12 and bonding them to each other by needle punching and bonding them to the bubble 12, (14).

In the next step, bat fibers are arranged on both sides of the base material 10 and needling is performed to form bat fiber layers 20 and 30 on both sides of the base material 10 to obtain a laminate. Specifically, the bat fiber is disposed on one main surface of the base material 10, the needling is performed, then the bat fiber is disposed on the other main surface of the base material 10, and the needling is performed, The fibrous layer 20 and the second bat fiber layer 30 are obtained. In addition, either the first bat fiber layer 20 or the second bat fiber layer 30 may be formed first.

The next step is to form the first bat fiber layer 20 in a state in which the airtight sheet is disposed on the main surface opposite to the first bat fiber layer 20, that is, on the second bat fiber layer 30, Press at a temperature above the glass transition temperature of the bat fiber. Thus, the airtight sheet is adhered to the second fibrous layer 30 to form the airtight sheet layer 40, and the outer surface 21 of the first bat fiber layer 20 is softened and smoothed.

The press temperature is not particularly limited as long as the press temperature is not lower than the glass transition temperature of the bat fiber constituting the first bat fiber layer 20 but is preferably not lower than the glass transition temperature or decomposition temperature of the bat fiber constituting the first bat fiber layer 20 It is below the melting temperature. Specifically, the press temperature is, for example, 270 to 330 占 폚, preferably 280 to 300 占 폚.

The press pressure is not particularly limited, but is preferably 5 to 40 kg / cm ² , and more preferably 10 to 20 kg / cm ² , for example, from the viewpoint of stability of heat conductivity and continuity of cushioning property when the cushioning pad 1 for hot press is used .

The pressing time is not particularly limited and can be appropriately set, but is, for example, 10 to 40 minutes, preferably 15 to 25 minutes.

By the above process, the cushioning pad 1 for hot pressing can be obtained. Further, the obtained cushioning pad 1 for hot pressing can be appropriately cut according to the use, and post-treatment such as cleaning can be performed.

<4. Modifications>

Next, a modified example of the above-mentioned cushioning pad for hot pressing 1 will be described. 4 is a sectional view of a cushioning pad for hot pressing according to a modification of the present invention. The cushioning pad 1 for hot press shown in Fig. 4 has a structure in which the second bat fiber layer 30 is omitted and the airtight sheet layer 40 is directly bonded to the main face 10a of the base 10 opposite to the first bat fiber layer 20 side The cushioning material 1 is different from the cushioning material 1 for hot pressing in that

In this modified example, the cushioning pad 1 for hot pressing 1 is provided with the first bat fiber layer 20 as described above, so that napping of the bat fiber is prevented and the peeling property from the nirvana is excellent. The cushioning pad 1 for thermal press has an airtight sheet layer 40 so that the airtightness of the outer surface 21 of the first batt fibrous layer 20 is excellent and the conveyability at the time of automatic loading is excellent.

Further, as described above, the second bat fiber layer 30 is disposed mainly for suppressing warping when the cushioning pad 1 for hot pressing is used. Therefore, the cushioning pad for hot pressing 1 A is suitable for the case where the occurrence of warpage is not problematic and the warp is suppressed by the material composition of each layer even if the second batting fiber layer is omitted.

The cushioning pad 1 A for hot pressing can be produced in the same manner as the cushioning pad for hot pressing 1 except that the formation of the second batting fibrous layer 30 is omitted in the step of obtaining the laminate. That is, at the time of pressing, the airtight sheet is arranged on the main surface of the laminate opposite to the first bat fiber layer 20. In this case, an adhesive may be disposed between the substrate 10 and the airtight sheet layer 40 in order to strengthen the bond between the substrate 10 and the airtight sheet layer 40, and they may be adhered to each other.

[Example]

Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples.

<1. Production of cushioning material for hot press>

(1) Preparation of substrate

First, a fabric (base yarn: 2 / 20S (twentieth twin span yarn) having a warp and weft of meta-based aromatic polyamide fiber (m-aramid fiber) / 1 plain weave, weight per unit area: 100 g / m ² ) was prepared. Then, m-aramid fiber (fineness: 2.2 dtex, fiber length: 51 mm) was laminated on both sides with a total weight per unit area of 900 g / m ² to prepare a substrate having felt layers on both sides of the woven fabric.

(2) Formation of Bat Fiber Layer

Next, non-stretched m-aramid fibers (fiber length: 51 mm, glass transition temperature: 270 占 폚) of fineness shown in Table 1 were prepared as the bat fibers of the first and second bat fiber layers, A laminate having first and second batt fibrous layers of 150 g / m ² in weight per unit area and having first and second batt fibrous layers on both sides was obtained. In Example 5, the second bat fiber layer was not formed.

The formation of the first and second bat fiber layers was carried out by disposing the bat fibers as a pre-bat fiber layer on the base material and needle-bonding the base fiber and the pre-bat fiber layer together.

(3) Presses

Then, aramid paper (m-aramid paper, thickness: 178 占 퐉) was placed on the second batt fibrous layer, the aramid paper was bonded to the second batt fibrous layer with the airtight sheet layer, And the outer surface of the fiber layer was softened and smoothed. The press conditions are as shown in Table 1. In Example 5, instead of the aramid paper, an ethylene-tetrafluoroethylene copolymer film (ETFE film, thickness: 50 μm) was disposed on the side opposite to the first bat fiber layer of the substrate and pressed. In Comparative Example 1, the press was performed without placing the aramid paper on the second bat fiber layer. In Comparative Example 3, the aramid paper was placed on both sides of the laminate and pressed. Thus, the cushioning pad for hot pressing according to Examples 1 to 5 and Comparative Examples 1 to 3 was obtained.

<2. Evaluation>

(1) Surface roughness

The surface roughness Ra of the outer surface of the first bat fiber layer was measured according to JIS-B0633 using a surface roughness contour meter (Surfcom 480A, manufactured by Tokyo Seimitsu Corporation) with respect to the cushioning pad for thermal press of each example and each comparative example did. The results are shown in Table 1. The cushioning pad for hot pressing according to Comparative Example 3 in the table indicates the surface roughness of the airtight sheet disposed on the first bat fiber layer.

(2) Air permeability

The air permeability of the cushioning pad for hot pressing according to each of the examples and comparative examples was measured using an air permeability meter (Frazier permeameter: manufactured by Tokyo Seimitsu Corporation) according to the fraser shape specified in JIS L 1096. In the measurement of the air permeability, the suction surface was set to the side of the first bat fiber layer. The results are shown in Table 1. The values in parentheses in the table are actually the measured air permeability, and the values without parentheses are the actual measured air permeability according to the marking method specified in JIS L 1096.

(3) aspect ratio of bat fiber

The cross section of the outer surface of the first bat fiber layer was observed with a scanning electron microscope and the aspect ratio of the bat fibers constituting the outer surface of the first bat fiber layer (the diameter in the plane direction of the hot press cushion material / Diameter) was measured. The results are shown in Table 1.

(4) Lint

Short fibers protruding from the surface of the first bat fiber layer were observed using a microscope (digital microscope VHX-900: manufactured by KEITH) with respect to the cushioning pad for hot pressing in each of the examples and comparative examples. At this time, a short fiber having a length of 0.5 mm or more protruded from the surface of the first bat fiber layer, or that the short fiber protruded in a loop shape was evaluated as "B ", and the others were evaluated as" A ". The results are shown in Table 1.

(5) Peelability

In a heat pressing apparatus for pressing a cushioning pad for hot pressing of each of the embodiments and Comparative Examples by upward and downward movement of an upper side cylinder with an upper side cylinder and a lower side cylinder provided with a stainless steel plate (SUS plate) on the upper side cylinder, A cushioning pad for hot pressing was placed between the SUS plate and the lower side heat bar so that the surface of the first bat fiber layer of the cushioning material was in contact with the SUS plate, and heat press was performed (press condition: 220 캜 - 40 kg / cm ^{2 -} And then opened the press. At this time, the time until each of the cushioning materials was naturally peeled off from the SUS plate and measured was measured. The time of 3 seconds or less was evaluated as "A", and the time exceeding 3 seconds was evaluated as "B". The results are shown in Table 1.

(6) Returnability

The cushioning pad for hot pressing of each of the examples and comparative examples was sampled at a diameter of 100 mm and a silicone rubber sucker having a diameter of 50 mm was adsorbed to the center of the surface of the first bat fiber layer of each hot press cushioning material. Then, the cushioning material for each thermal press was lifted through a sucker plate. At this time, the cushioning material for hot pressing was evaluated as "A ", and the unincorporated was evaluated as" B ". The results are shown in Table 1.

Manufacturing conditions Composition of cushioning material for hot press evaluation Fineness of bat fiber
(dtex) Press condition The first bat
Fibrous layer Presence or absence of airtight sheet layer Ventilation
(cm ³ / cm ² / sec) fluff Peelability Returnability Temperature
(° C) pressure
(kg / cm ² ) time
(minute) Surface roughness of outer surface RA
(μm) Aspect ratio of bat fiber The first bat fiber layer side The side of the second bat fiber layer Example 1 0.8 290 10 15 2.5 1.6 radish U 0.0
(0.03) A A A Example 2 3.0 290 10 15 4.2 2.0 radish U 0.0
(0.04) A A A Example 3 5.6 290 10 15 6.3 1.9 radish U 0.0
(0.04) A A A Example 4 11 290 15 20 10.1 1.3 radish U 0.1
(0.06) A A A Example 5 3.0 290 10 15 4.2 2.0 radish U 0.0
(0.04) A A A Comparative Example 1 3.0 290 10 15 4.4 2.0 radish radish 0.8 A A B Comparative Example 2 3.0 240 10 15 15.8 1.1 radish U 1.8 B A B Comparative Example 3 3.0 290 10 15 1.2 - U U 0.0
(0.02) A B A

As shown in Table 1, the cushioning pad for hot pressing according to Examples 1 to 5 suppressed fluff of the bat fiber layer, and was excellent in peelability and transportability. On the other hand, the cushioning pad for hot pressing according to Comparative Example 1 did not have an airtight sheet layer, and thus the conveyability was not sufficient. Further, in the cushioning pad for hot pressing according to Comparative Example 2, when the press processing was performed at a temperature lower than the glass transition temperature of the bat fiber, the softening smoothing treatment was not sufficiently performed. Therefore, the cushioning pad for hot pressing according to Comparative Example 2 was unable to suppress napping of the bat fiber, and also the air permeability became large and the conveyability was poor.

In the cushioning pad for hot pressing according to Comparative Example 3, the airtight sheet layer was disposed on the first bat fiber layer. As a result, the outer surface of the first bat fiber layer was not softened and smoothed, and the first bat fiber layer was not exposed on the outer surface . As a result, the cushioning pad for hot pressing according to Comparative Example 3 could not have the irregularities on the proper outer surface originating from the first bat fiber layer, and the peelability was inferior.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. I understand.

1, 1A cushioning material for hot press
10 Base material
12 Ground fabric
14 felt layer
20 first batt fibrous layer
21 outer surface
30 second batt fibrous layer
40, 40A airtight sheet layer
41 outer surface
100 heat board
200 Mirror face plate
300 laminates
301 prepreg
302 metal foil

Claims (11)

A base material,
A bat fiber layer disposed on the first major surface of the substrate and having an outer surface softened and smoothed;
And an airtight sheet layer disposed on a second major side of the substrate.
The cushioning pad for hot pressing according to claim 1, wherein the bat fiber layer includes bat fibers and is softened and smoothed at a temperature equal to or higher than the glass transition temperature of the bat fiber.
A substrate,
A base fiber layer disposed on the first main surface of the base material,
An airtight sheet layer disposed on a second major side of the substrate,
Wherein the outer surface of the bat fiber layer is composed of fibers at least partially flattened along the outer surface.
The cushioning pad for hot pressing according to any one of claims 1 to 3, wherein the airtight sheet layer is composed of a fiber sheet or a resin film.
The cushioning pad for hot pressing according to any one of claims 1 to 4, wherein the outer surface of the bat fiber layer has a surface roughness Ra of 2.5 to 11 μm.
The cushioning pad for hot pressing according to any one of claims 1 to 5, wherein the air permeability according to the shape of a fraser specified in JIS L 1096 is 0.2 cm ³ / cm ² / sec or less.
The cushioning pad for hot pressing according to any one of claims 1 to 6, wherein the bat fiber layer comprises unstretched meta-based aromatic polyamide fiber.
The cushioning pad for hot pressing according to any one of claims 1 to 7, wherein the fineness of the bat fibers constituting the bat fiber layer is 0.8 to 11 dtex.
9. The cushioning pad according to any one of claims 1 to 8, further comprising a bat fiber layer disposed between the base material and the airtight sheet layer.
10. The cushioning pad according to any one of claims 1 to 9, wherein the substrate comprises aromatic polyamide fibers.
A method for producing a laminated body, comprising the steps of arranging a bat fiber on at least one main surface of a base material to perform needling, and forming a bat fiber layer on at least one main surface of the base material,
And a step of performing pressing at a temperature equal to or higher than the glass transition temperature of the bat fiber in a state where the airtight sheet is disposed on the other main side surface of the base material in the laminate.

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