TWI766945B - Cushioning material for hot press and method for producing the same - Google Patents

Cushioning material for hot press and method for producing the same Download PDF

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TWI766945B
TWI766945B TW107104475A TW107104475A TWI766945B TW I766945 B TWI766945 B TW I766945B TW 107104475 A TW107104475 A TW 107104475A TW 107104475 A TW107104475 A TW 107104475A TW I766945 B TWI766945 B TW I766945B
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hot pressing
buffer material
fluff
fiber layer
base material
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TW107104475A
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TW201902674A (en
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菊池能樹
河邊和利
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日商市川股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B32B37/1027—Pressing using at least one press band
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20454—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/08—PCBs, i.e. printed circuit boards

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)

Abstract

本發明之課題在於提供一種新穎且經改良之熱壓用緩衝材及熱壓用緩衝材之製造方法，前述熱壓用緩衝材在自動堆載時之運送性、與熱盤之剝離性優異，且可抑制使用時之起毛。就解決手段而言，有關本發明之熱壓用緩衝材具有基材、配置在前述基材之第1主面且外表面經軟化平滑化的毛絮纖維層、與配置在前述基材之第2主面側的氣密片層。前述氣密片層亦可藉由纖維片或樹脂薄膜來構成。The subject of the present invention is to provide a novel and improved buffer material for hot pressing and a method for producing the buffer material for hot pressing, the buffer material for hot pressing is excellent in transportability during automatic stacking and peelability from a hot plate, And can suppress the fluff when using. As a solution, the buffer material for hot pressing according to the present invention has a base material, a fluff fiber layer disposed on the first main surface of the base material and whose outer surface is softened and smoothed, and a first material disposed on the base material. 2 Airtight sheets on the main side. The aforementioned airtight sheet layer may also be constituted by a fiber sheet or a resin film.

Description

熱壓用緩衝材及熱壓用緩衝材之製造方法Buffer material for hot pressing and manufacturing method of buffer material for hot pressing

發明領域 本發明有關於熱壓用緩衝材及熱壓用緩衝材之製造方法。FIELD OF THE INVENTION The present invention relates to a buffer material for hot pressing and a method for producing the buffer material for hot pressing.

發明背景 一般而言，在製造具有印刷佈線、液晶顯示板等積層構造之電子零件，或者具有積層材、裝飾板、積成材等積層構造之建材時，在目的是積層體之壓製成形或熱壓著時，會進行熱壓。BACKGROUND OF THE INVENTION In general, when manufacturing electronic parts having a laminated structure such as printed wiring and liquid crystal display panels, or building materials having a laminated structure such as a laminated material, a decorative board, and a laminated material, the purpose is to press-form or hot-press the laminated body. When it is on, it will be hot pressed.

例如，印刷佈線板可藉由在積層樹脂製預浸體與銅箔等之後，利用熱盤來加壓及加熱，亦即，進行熱壓，來製造。在熱壓時，預浸體會因加熱使黏度暫時下降而返回液體狀態，之後，會慢慢進行硬化。在如此熱壓之中，會要求積層體所負荷之壓力及溫度的分布要均一。For example, a printed wiring board can be manufactured by pressing and heating with a hot plate after laminating a resin-made prepreg, a copper foil, or the like, that is, by performing hot pressing. During hot pressing, the viscosity of the prepreg is temporarily reduced by heating and returns to a liquid state, and then gradually hardens. In such hot pressing, the distribution of pressure and temperature applied to the laminate is required to be uniform.

因此，在熱壓時，一般會使用熱壓用緩衝材。熱壓用緩衝材會配置在熱盤與積層體之間，使來自熱盤之負荷壓力及溫度朝面方向分散，藉此可在熱壓時使壓力分布及溫度分布均一化。因此，就熱壓用緩衝材來說，會需求用以使壓力分布及溫度分布均一化之適當的變形跟隨性、緩衝性、熱傳導性或高耐久性(例如耐熱性)等作為基本性能。Therefore, in hot pressing, a buffer material for hot pressing is generally used. The buffer material for hot pressing is arranged between the hot plate and the laminated body, and the load pressure and temperature from the hot plate are dispersed in the surface direction, thereby making the pressure distribution and temperature distribution uniform during hot pressing. Therefore, the buffer material for hot pressing requires suitable deformation followability, cushioning properties, thermal conductivity, and high durability (for example, heat resistance) for uniformizing pressure distribution and temperature distribution as basic properties.

專利文獻1揭示一種耐熱緩衝材，在全部或主要纖維是由間位系芳香族聚醯胺所構成之基體的單面或整面設置由未延伸之間位系芳香族聚醯胺纖維或含有該纖維之網(web)所構成的覆蓋層(cover layer)，且經在前述間位系芳香族聚醯胺纖維之玻璃轉移點以上的溫度進行熱處理。 專利文獻2揭示一種耐熱緩衝材，在由耐熱纖維所構成之本體之表面形成有由耐熱纖維所構成的氣密層。Patent Document 1 discloses a heat-resistant buffer material in which unstretched meta-aromatic polyamide fibers are provided on one side or the entire surface of a matrix in which all or main fibers are composed of meta-aromatic polyamide fibers. The cover layer constituted by the web of fibers is heat-treated at a temperature above the glass transition point of the aforementioned meta-aromatic polyamide fibers. Patent Document 2 discloses a heat-resistant buffer material in which an inner liner made of heat-resistant fibers is formed on the surface of a body made of heat-resistant fibers.

專利文獻3揭示一種熱壓用緩衝材，具備構成內部層之第一不織布、與配置在前述第一不織布兩面側並構成外部層之第二不織布，前述第二不織布在其構成材料方面是使用基重為80~400g/m2 之共聚合系對位型聚芳醯胺纖維，前述第一不織布在其構成材料方面是使用纖維之剛性(rigidity)比前述共聚合系對位型聚芳醯胺纖維還高的纖維，且前述第一不織布及前述第二不織布的耐熱溫度分別在270℃以上。Patent Document 3 discloses a buffer material for hot pressing, 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. The weight is 80~400g/ m2 of the copolymerized para-type polyaramide fiber, and the above-mentioned first non-woven fabric uses the rigidity of the fiber than the aforementioned copolymerized para-type polyaramide in terms of its constituent material. The fiber is also high in fiber, and the heat-resistant temperature of the first non-woven fabric and the second non-woven fabric are respectively 270°C or higher.

[先行技術文獻] 專利文獻1：日本特開平6-91780號公報 專利文獻2：日本特開平8-169074號公報 專利文獻3：日本特開2014-37654號公報[Prior Art Documents] Patent Document 1: Japanese Patent Laid-Open No. 6-91780 Patent Document 2: Japanese Patent Laid-Open No. 8-169074 Patent Document 3: Japanese Patent Laid-Open No. 2014-37654

發明概要 [發明欲解決之課題] 然而，為了要順利進行熱壓步驟，熱壓用緩衝材一般會要求良好的與熱盤之剝離性。進一步，在使用熱壓用緩衝材時，必須要抑制構成之纖維材料的起毛及接下來的脫離(脫毛)。在產生脫毛的情況下，已離脫的纖維材料會混入積層體，而可能會對最終製品有不好的影響。SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] However, in order to smoothly carry out the hot pressing step, the buffer material for hot pressing is generally required to have good releasability from the hot plate. Furthermore, when the buffer material for hot pressing is used, it is necessary to suppress the fuzzing and subsequent detachment (depilation) of the constituent fiber material. In the event of depilation, the detached fibrous material can be incorporated into the laminate and may adversely affect the final product.

另一方面，在自動化熱壓步驟之目的之下，會有自動堆載熱壓用緩衝材的情形。在如此自動堆載當中，是透過吸引並保持住熱壓用緩衝材，來進行熱壓用緩衝材之提起、運送、載置。在此，近年來熱壓用緩衝材有輕量化的傾向，因此在自動堆載裝置上亦有透過比以往還弱的吸引力來進行吸引的傾向。故，就熱壓用緩衝材來說，要求即便透過比以往還弱之吸引力仍可自動堆載且良好的運送性。On the other hand, for the purpose of automating the hot pressing step, there are cases where the buffer material for hot pressing is automatically stacked. In such automatic stacking, the buffer material for hot pressing is lifted, transported, and placed by attracting and holding the buffer material for hot pressing. Here, in recent years, there is a tendency for the shock absorbing material for hot pressing to become lighter in weight, and therefore, there is a tendency for the automatic stacking device to be sucked by a suction force that is weaker than before. Therefore, the buffer material for hot pressing is required to be able to be automatically stacked even by a weaker suction force than before and to have good transportability.

在此，如專利文獻1或專利文獻3所記載之在表面層方面是具有纖維層或不織布層的熱壓用緩衝材並不具有足夠應付這般近年來自動運送傾向的運送性。另一方面，在如專利文獻2所記載之設置有氣密層的情況下，與熱盤的剝離性並不足夠。這般上述專利文獻1~3所記載之熱壓用緩衝材並非同時滿足如上所述之性能者。 就此，本發明是有鑑於上述問題而成者，且本發明之目的是在於提供一種新穎且經改良之熱壓用緩衝材及熱壓用緩衝材之製造方法，前述熱壓用緩衝材在自動堆載時之運送性、與熱盤之剝離性優異，且可抑制使用時之起毛。Here, as described in Patent Document 1 or Patent Document 3, the hot-pressing buffer material having a fiber layer or a non-woven fabric layer on the surface layer does not have sufficient transportability to cope with the tendency of automatic transport in recent years. On the other hand, when an airtight layer is provided as described in Patent Document 2, the releasability from the hot disk is not sufficient. In this way, the buffer materials for hot pressing described in the above-mentioned Patent Documents 1 to 3 do not satisfy the above-mentioned properties at the same time. In this regard, the present invention is made in view of the above-mentioned problems, and the object of the present invention is to provide a novel and improved buffer material for hot pressing and a method for manufacturing the buffer material for hot pressing, wherein the buffer material for hot pressing is automatically It has excellent transportability during stacking and peelability from hot plates, and can suppress fluff during use.

[用以解決課題之手段] 為了解決上述課題，依據本發明之一觀點，可提供一種熱壓用緩衝材，其具有：基材、配置在前述基材之第1主面且外表面經軟化平滑化的毛絮纖維層、與配置在前述基材之第2主面側的氣密片層。[MEANS TO SOLVE THE PROBLEM] In order to solve the above-mentioned problem, according to one aspect of the present invention, there is provided a buffer material for hot pressing, which has a base material, a first main surface arranged on the base material, and a softened outer surface. The smoothed fluff fiber layer and the airtight sheet layer arranged on the second main surface side of the base material.

前述毛絮纖維層含有毛絮纖維，且可經毛絮纖維之玻璃轉移溫度以上的溫度而軟化平滑化。The aforementioned batting fiber layer contains batting fibers, and can be softened and smoothed at a temperature equal to or higher than the glass transition temperature of the batting fibers.

又，為了解決上述課題，依據本發明之另一觀點，可提供一種熱壓用緩衝材，其具有：基材、配置在前述基材之第1主面的毛絮纖維層、與配置在前述基材之第2主面側的氣密片層，且前述毛絮纖維層之外表面至少一部分是藉由沿著前述外表面成為扁平狀的纖維來構成。Further, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a buffer material for hot pressing, comprising a base material, a fluff fiber layer disposed on the first main surface of the base material, and a buffer material disposed on the above-mentioned base material. In the airtight sheet layer on the second main surface side of the base material, at least a part of the outer surface of the batt fiber layer is formed of flat fibers along the outer surface.

前述氣密片層亦可藉由纖維片或樹脂薄膜來構成。 前述毛絮纖維層之外表面的表面粗度Ra亦可為2.5~11μm。 根據JIS L 1096所規定之弗雷澤型法(Frazier type method)的通氣度亦可為0.2cm3 /cm2 /sec以下。The aforementioned airtight sheet layer may also be constituted by a fiber sheet or a resin film. The surface roughness Ra of the outer surface of the aforementioned fluff fiber layer may be 2.5 to 11 μm. The air permeability according to the Frazier type method specified in JIS L 1096 may be 0.2 cm 3 /cm 2 /sec or less.

前述毛絮纖維層亦可含有未延伸間位系芳香族聚醯胺纖維。 構成前述毛絮纖維層之毛絮纖維的纖度亦可為0.8~11dtex。 前述熱壓用緩衝材亦可進一步具有配置在前述基材與前述氣密片層之間的毛絮纖維層。 前述基材亦可含有芳香族聚醯胺纖維。The aforementioned batt fiber layer may contain unstretched meta-aromatic polyamide fibers. The fineness of the fluff fibers constituting the aforementioned fluff fiber layer may also be 0.8 to 11 dtex. The said buffer material for hot pressing may further have the fluff fiber layer arrange|positioned between the said base material and the said airtight sheet layer. The aforementioned base material may also contain aromatic polyamide fibers.

又，為了解決上述課題，依據本發明之另一觀點，可提供一種熱壓用緩衝材之製造方法，具有如下步驟： 獲得積層體之步驟：在基材之至少一主面配置毛絮纖維並進行針刺(needling)而在前述基材之至少一主面形成毛絮纖維層，獲得積層體；及 進行壓製之步驟：在前述積層體中前述基材之另一主面側配置有氣密片的狀態下，在前述毛絮纖維之玻璃轉移溫度以上之溫度下進行壓製。Furthermore, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a method for producing a buffer material for hot pressing, comprising the steps of: obtaining a layered body: arranging fluff fibers on at least one main surface of a base material, and Needling is performed to form a fluff fiber layer on at least one main surface of the base material to obtain a laminate; and the step of pressing: an airtight airtight is arranged on the other main surface side of the base material in the laminate. In the state of a sheet, pressing is performed at a temperature above the glass transition temperature of the aforementioned fluff fibers.

[發明效果] 依據如上說明之本發明，可提供一種新穎且經改良之熱壓用緩衝材及熱壓用緩衝材之製造方法，前述熱壓用緩衝材在自動堆載時之運送性、與熱盤之剝離性優異，且可抑制使用時之起毛。[Effects of the Invention] According to the present invention as described above, a novel and improved buffer material for hot pressing and a method for producing the buffer material for hot pressing can be provided, the buffer material for hot pressing having transportability during automatic stacking, and The hot plate has excellent peelability and can suppress fluff during use.

[用以實施發明之形態] 以下參照本案所附圖式，就本發明的較佳實施形態進行詳細說明。圖1及圖2是示意圖，顯示一關於本發明一實施形態之熱壓用緩衝材之使用狀態的例子；圖3是關於本發明一實施形態之熱壓用緩衝材的剖面圖。此外，在本說明書及圖式中，具有實質上相同機能構成的構成要素會透過附上相同的符號來省略重複說明。又，為了說明的容易化，各圖之部件會適當的強調，且圖中的尺寸並非顯示實際的尺寸。[Forms for Carrying out the Invention] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the drawings attached to the present application. 1 and 2 are schematic diagrams showing an example of the use state of the buffer material for hot pressing according to an embodiment of the present invention; FIG. 3 is a cross-sectional view of the buffer material for hot pressing according to an embodiment of the present invention. In addition, in this specification and drawings, the same code|symbol is attached|subjected to the component which has substantially the same functional structure, and repeated description is abbreviate|omitted. In addition, in order to simplify description, the components of each figure will be emphasized suitably, and the dimension in a figure does not show an actual dimension.

＜1.熱壓＞ 首先，在說明熱壓用緩衝材之前，先說明一使用有關於本發明實施形態之熱壓用緩衝材之熱壓的例子。另外，在本實施形態中，是設定進行熱壓之對象物為作為印刷佈線板之前驅體的積層板300來進行說明。<1. Hot pressing> First, before describing the buffer material for hot pressing, an example of hot pressing using the buffer material for hot pressing according to the embodiment of the present invention will be described. In addition, in this embodiment, the object to be hot-pressed is assumed to be the laminate 300 as a precursor of a printed wiring board.

如圖1所示，熱壓是利用上下一對之經加熱的熱盤100以壓迫積層板300來進行。又，如圖1所示，熱壓可同時對複數個積層板300來進行。As shown in FIG. 1 , the hot pressing is performed by using a pair of upper and lower heated hot plates 100 to press the laminate 300 . Furthermore, as shown in FIG. 1 , the hot pressing may be performed on a plurality of laminates 300 at the same time.

如圖2所示，積層板300是在預浸體301的兩面配置銅箔等的金屬箔302。預浸體301藉由重疊複數枚板材所構成，前述板材是將玻璃布(Glass cloth)含浸在硬化性樹脂並做成半硬化狀態者。As shown in FIG. 2 , in the laminate 300 , metal foils 302 such as copper foils are arranged on both surfaces of a prepreg 301 . The prepreg 301 is formed by stacking a plurality of sheet materials, which are obtained by impregnating a glass cloth with a curable resin and making it a semi-cured state.

在複數個積層板300之間，為了不使其等直接接觸且為了表面之成形，可配置不鏽鋼板等的鏡面板200。此外，存在於上端之積層板300的上方及存在於下端之積層板300的下方，亦可為了迴避與熱壓用緩衝材1及熱盤100之直接接觸且為了表面之成形，而可配置鏡面板200。Between the plurality of laminates 300, a mirror plate 200 such as a stainless steel plate may be arranged so as not to directly contact them and to shape the surface. In addition, a mirror may be arranged above the laminated board 300 at the upper end and below the laminated board 300 at the lower end in order to avoid direct contact with the buffer material 1 for hot pressing and the hot plate 100 and to shape the surface. panel 200.

然後，積層有積層板300與鏡面板200之被壓製對象物是隔著配置在其上下之熱壓用緩衝材1並藉由熱盤100來壓製。在此，熱壓用緩衝材1具有適當的熱傳導性、變形跟隨性及緩衝性，且具有將來自熱盤100之壓力及熱均一的傳到積層有積層板300與鏡面板200之被壓製對象物的機能。Then, the object to be pressed on which the laminate plate 300 and the mirror plate 200 are laminated is pressed by the hot platen 100 with the buffer material 1 for hot pressing arranged on the upper and lower sides thereof. Here, the buffer material 1 for hot pressing has appropriate thermal conductivity, deformation followability, and buffering properties, and has the ability to uniformly transmit the pressure and heat from the hot plate 100 to the pressed object on which the laminated plate 300 and the mirror plate 200 are laminated. function of things.

以往之熱壓用緩衝材在自動堆載時之運送性、與熱盤之剝離性、或使用時之起毛上有問題，然在關於本實施形態之熱壓用緩衝材1上，如下所示，可防止該等問題。The conventional buffer material for hot pressing has problems with the transportability during automatic stacking, the peelability from the hot plate, or the fluffing during use. However, the buffer material 1 for hot pressing according to the present embodiment is as follows , which prevents these problems.

＜2.熱壓用緩衝材＞ 接著，針對關於本實施形態之熱壓用緩衝材進行說明。<2. Buffer material for hot pressing> Next, the buffer material for hot pressing according to the present embodiment will be described.

圖3所示熱壓用緩衝材1可用於例如製造印刷佈線板等具有積層構造的電子零件，更具體而言，可用於成形壓製。熱壓用緩衝材1具有基材10、配置在基材10之一主面(第1主面)的第1毛絮纖維層20、配置在基材10之另一主面(第2主面)的第2毛絮纖維層30、與配置在和第2毛絮纖維層30之基材10側呈相對側之面的氣密片層40。The buffer material 1 for hot pressing shown in FIG. 3 can be used, for example, for the manufacture of electronic components having a laminated structure such as a printed wiring board, and more specifically, it can be used for forming and pressing. The buffer material 1 for hot pressing includes a base material 10 , a first fluff fiber layer 20 disposed on one main surface (first main surface) of the base material 10 , and a second main surface (second main surface) disposed on the base material 10 . ) of the second batt fiber layer 30 , and the airtight sheet layer 40 disposed on the surface opposite to the base material 10 side of the second batt fiber layer 30 .

基材10是熱壓用緩衝材1之主體，是用以發揮熱傳導性、變形跟隨性、緩衝性之所謂作為熱壓用緩衝材1之基本性能的層。基材10具有基布12與毛氈層14。The base material 10 is the main body of the buffer material 1 for hot pressing, and is a layer for exhibiting the so-called basic properties of the buffer material 1 for hot pressing, such as thermal conductivity, deformation followability, and cushioning properties. The base material 10 has a base cloth 12 and a felt layer 14 .

基布12是在熱壓用緩衝材1中賦予維持拉伸強度、穩定形狀之纖維補強基材。基布12並無特別限定，可利用例如織布或格子狀素材來構成。又，基布12為織布時，織布的組織並無特別限定，可使用平紋織、斜紋織、緞紋織，或使用有該等之多重織的任一。格子狀素材可使用例如交疊有經線與緯線者。基布12之構成材料可適宜採用例如間位系芳香族聚醯胺、對位系芳香族聚醯胺、全芳香族聚酯纖維、聚對伸苯基苯幷二噁唑(PBO)纖維、不鏽鋼纖維等。此外，基布12亦可因應熱壓用緩衝材1的規格而適宜省略。The base fabric 12 is a fiber-reinforced base material that maintains tensile strength and stabilizes the shape in the buffer material for hot pressing 1 . The base fabric 12 is not particularly limited, and can be formed of, for example, a woven fabric or a lattice-like material. In addition, when the base fabric 12 is a woven fabric, the structure of the woven fabric is not particularly limited, and plain weave, twill weave, satin weave, or any of these multiple weaves can be used. As the lattice material, for example, a warp and a weft can be used. The constituent material of the base fabric 12 can be suitably used, for example, meta-aromatic polyamide, para-aromatic polyamide, wholly aromatic polyester fiber, polyparaphenylene benzobisoxazole (PBO) fiber, Stainless steel fiber, etc. In addition, the base fabric 12 may be appropriately omitted according to the specifications of the buffer material 1 for hot pressing.

毛氈層14是配置在基布12的兩面。毛氈層14是透過使短纖維彼此纏結所形成之纖維集合體層，在熱壓用緩衝材1中發揮熱傳導性、變形跟隨性、緩衝性之所謂作為熱壓用緩衝材1的基本性能。The felt layers 14 are arranged on both sides of the base fabric 12 . The felt layer 14 is a fiber aggregate layer formed by entangling short fibers with each other, and exhibits the basic properties of the hot-pressing buffer material 1 such as thermal conductivity, deformation followability, and cushioning properties.

毛氈層14可藉由例如將作為短纖維之由毛絮纖維構成的纖維網配置在基布12上，利用針軋(needle punching)使其互相纏結，同時使其纏結到基布12來形成。The felt layer 14 can be obtained by, for example, arranging a fiber web composed of fluff fibers as short fibers on the base fabric 12, entangling them with each other by needle punching, and simultaneously entangling them on the base fabric 12. form.

構成毛氈層14之材料並無特別限定，可藉由具有耐熱性之樹脂材料，例如宜為藉由芳香族聚醯胺來構成，且可使用例如間位系芳香族聚醯胺及/或對位系芳香族聚醯胺。具體而言，毛絮纖維可使用以上述材料所構成之人造棉(staple fiber)。亦即，基材10之毛氈層14宜含有芳香族聚醯胺纖維。更具體而言，可單獨使用以聚間苯二甲醯間苯二胺(polymetaphenylene isophthalamide)等為主體之間位系芳香族聚醯胺纖維(conex(商品名/帝人製)或Nomex (商品名/Dupont製))、以聚對苯二甲醯對苯二胺(poly paraphenylene terephthalamide)等為主體之對位系芳香族聚醯胺纖維(Kevlar(商品名/Dupont製)或Technora (商品名/帝人製))、PPS纖維(TORCON (商品名/TORAY製))等，或可2種以上組合使用。The material constituting the felt layer 14 is not particularly limited, and can be composed of a heat-resistant resin material, for example, aromatic polyamide, and, for example, meta-aromatic polyamide and/or para-aromatic polyamide can be used. The position is an aromatic polyamide. Specifically, as the fluff fiber, staple fiber composed of the above-mentioned materials can be used. That is, the felt layer 14 of the base material 10 preferably contains aromatic polyamide fibers. More specifically, meta-aromatic polyamide fibers (conex (trade name / Teijin) or Nomex (trade name) mainly containing polymetaphenylene isophthalamide or the like can be used alone. /Dupont)), para-aromatic polyamide fibers mainly composed of polyparaphenylene terephthalamide (Kevlar (trade name/Dupont) or Technora (trade name/ Teijin)), PPS fiber (TORCON (trade name / TORAY)), etc., or a combination of two or more.

構成毛氈層14之短纖維的纖維長並無特別限定，可設為例如38~130mm。又，構成毛氈層14之短纖維的纖度並無特別限定，可設為例如0.8~11dtex。The fiber length of the short fibers constituting the felt layer 14 is not particularly limited, and can be, for example, 38 to 130 mm. In addition, the fineness of the short fiber which comprises the felt layer 14 is not specifically limited, For example, it can be set as 0.8-11 dtex.

又，毛氈層14之基重可因應熱壓用緩衝材1之用途來選擇，而無特別限定，例如在基布12兩面之各層的合計為300~2700g/m2 、且宜為1000~2200g/m2 。藉此，可獲得適當的熱傳導性及變形跟隨性。In addition, the basis weight of the felt layer 14 can be selected according to the application of the hot-pressing buffer material 1 , and is not particularly limited. /m 2 . Thereby, appropriate thermal conductivity and deformation followability can be obtained.

第1毛絮纖維層20是配置在基材10之一主面，且構成熱壓用緩衝材1之表面層。又，第1毛絮纖維層20在熱壓用緩衝材1之使用時通常是配置在與熱盤接觸之側。The first fluff fiber layer 20 is arranged on one main surface of the base material 10 and constitutes a surface layer of the buffer material 1 for hot pressing. Moreover, the 1st fluff fiber layer 20 is normally arrange|positioned at the side which contacts a hot plate when the buffer material 1 for hot pressing is used.

第1毛絮纖維層20是藉由將毛絮纖維利用針軋使其纏結，同時將形成之毛絮纖維層的外表面進行軟化平滑化而形成。藉此，第1毛絮纖維層20之外表面21的至少一部分是藉由沿著外表面21而成為扁平狀的纖維來構成。The first batt fiber layer 20 is formed by softening and smoothing the outer surface of the formed batt fiber layer by entangling the batt fibers by needle rolling. Thereby, at least a part of the outer surface 21 of the 1st fluff fiber layer 20 is comprised by the fiber which becomes a flat shape along the outer surface 21.

如此軟化平滑化可藉由將構成第1毛絮纖維層20之毛絮纖維以玻璃轉移溫度以上之溫度來處理而進行。又，在軟化平滑化當中，宜邊維持上述溫度，邊將第1毛絮纖維層20之外表面21以熱盤等進行押壓。Such softening and smoothing can be performed by treating the batt fibers constituting the first batt fiber layer 20 at a temperature equal to or higher than the glass transition temperature. In addition, in softening and smoothing, it is preferable to press the outer surface 21 of the first batt fiber layer 20 with a hot plate or the like while maintaining the above-mentioned temperature.

藉由如此將外表面21進行軟化平滑化，外表面21附近的毛絮纖維會互相密著而自我接著，或嵌入到其他纖維形成之空間而接著。藉此，可防止在外表面21之毛絮纖維的起毛。進而可防止自第1毛絮纖維層20的脫毛。By softening and smoothing the outer surface 21 in this way, the fluff fibers in the vicinity of the outer surface 21 will adhere to each other and adhere to each other, or be embedded in the space formed by other fibers and adhered. Thereby, fluffing of the fluff fibers on the outer surface 21 can be prevented. Furthermore, the hair fall from the 1st batt fiber layer 20 can be prevented.

又，第1毛絮纖維層20之外表面21可透過軟化平滑化而適當的緻密化，而使熱壓用緩衝材1的通氣性降低。藉此，與後述之氣密片層40一起，熱壓用緩衝材1之通氣度可變的夠低，而可提升熱壓用緩衝材1在自動堆載時的運送性。又，由於外表面21被緻密化，因此亦可自第1毛絮纖維層20側利用自動堆載裝置之吸引器吸引、保持、並運送熱壓用緩衝材1。In addition, the outer surface 21 of the first batt fiber layer 20 can be properly densified by softening and smoothing, thereby reducing the air permeability of the buffer material 1 for hot pressing. Thereby, together with the airtight sheet layer 40 to be described later, the air permeability of the buffer material 1 for hot pressing can be made sufficiently low, and the transportability of the buffer material 1 for hot pressing during automatic stacking can be improved. Moreover, since the outer surface 21 is densified, the buffer material 1 for hot pressing can also be sucked, held, and transported by the suction device of the automatic stacker from the side of the first fluff fiber layer 20 .

另一方面，雖說第1毛絮纖維層20之外表面21會被平滑化，然因是由毛絮纖維所構成，因此具有適當的表面粗度，第1毛絮纖維層20與熱盤之間的剝離性優異。因此，熱壓用緩衝材1在與熱盤之剝離性上優異。On the other hand, although the outer surface 21 of the first batt fiber layer 20 will be smoothed, since it is composed of batt fibers, it has an appropriate surface roughness. Excellent peelability between them. Therefore, the buffer material 1 for hot pressing is excellent in releasability from the hot plate.

第1毛絮纖維層20之外表面21的表面粗度Ra並無特別限定，例如為2.5~11μm，且宜為3~8μm、以4~7μm為佳。若第1毛絮纖維層20之外表面21的表面粗度Ra在上述下限値以上，則可做出更優異的熱壓用緩衝材1與熱盤的剝離性。又，若第1毛絮纖維層20之外表面21的表面粗度Ra在上述上限値以下，則可做出更優異的自動堆載熱壓用緩衝材1時之運送性。此外，在本說明書中，表面粗度Ra可基於JIS-B0633來測定。The surface roughness Ra of the outer surface 21 of the first batt fiber layer 20 is not particularly limited, but is, for example, 2.5 to 11 μm, preferably 3 to 8 μm, preferably 4 to 7 μm. When the surface roughness Ra of the outer surface 21 of the first batt fiber layer 20 is more than the above-mentioned lower limit value, more excellent releasability between the buffer material 1 for hot pressing and the hot plate can be obtained. In addition, if the surface roughness Ra of the outer surface 21 of the first batt fiber layer 20 is below the above-mentioned upper limit value, more excellent transportability of the buffer material 1 for automatic hot pressing can be obtained. In addition, in this specification, the surface roughness Ra can be measured based on JIS-B0633.

又，如上所述，第1毛絮纖維層20之外表面21的至少一部分是藉由沿著外表面21而成為扁平狀的毛絮纖維來構成。 在此，毛絮纖維之扁平狀程度可依構成外表面21之毛絮纖維之剖面的寬高比(aspect ratio)來規定。具體而言，可設為在觀察第1毛絮纖維層20厚度方向之剖面時，毛絮纖維之寬高比(熱壓用緩衝材1之平面方向的徑/熱壓用緩衝材1之厚度方向的徑)的平均。 上述寬高比並無特別限定，可為例如1.2~3.0、且宜為1.5~2.5。Moreover, as mentioned above, at least a part of the outer surface 21 of the 1st batt fiber layer 20 is comprised by the batt fiber which becomes a flat shape along the outer surface 21. Here, the degree of flatness of the fluff fibers can be determined according to the aspect ratio of the cross-section of the fluff fibers constituting the outer surface 21 . Specifically, when the cross section of the first batt fiber layer 20 in the thickness direction is observed, the aspect ratio of the batt fibers (diameter in the plane direction of the buffer material 1 for hot pressing/thickness of the buffer material 1 for hot pressing can be set) direction diameter). The said aspect ratio is not specifically limited, For example, it may be 1.2-3.0, Preferably it is 1.5-2.5.

又，在構成第1毛絮纖維層20之毛絮纖維方面，若可進行上述之軟化平滑化，則無特別限定，可使用例如未延伸之纖維，且宜為未延伸芳香族聚醯胺纖維、以未延伸間位系芳香族聚醯胺纖維為佳。如此未延伸之纖維，與受到延伸處理之纖維相比，藉由軟化平滑化處理會比較容易變形，而在形成如上述之外表面21上是有利的。 此外，毛絮纖維除了上述之未延伸的纖維之外，還可使用已受延伸處理的纖維。如此纖維可舉於上述毛氈層14可使用之各種纖維。又，此時，第1毛絮纖維層20中未延伸纖維之重量比例為例如70質量%以上，且宜為80質量%以上、以100質量%為佳。In addition, the fluff fibers constituting the first fluff fiber layer 20 are not particularly limited as long as the above-mentioned softening and smoothing can be performed. For example, unstretched fibers can be used, and unstretched aromatic polyamide fibers are preferred. , Unextended meta-series aromatic polyamide fibers are preferred. Such unstretched fibers are more easily deformed by softening and smoothing treatment than fibers subjected to stretching treatment, which is advantageous in forming the outer surface 21 as described above. In addition to the above-mentioned unstretched fibers, fibers that have been stretched can also be used as the batt fibers. Such fibers include various fibers that can be used for the felt layer 14 described above. In addition, at this time, the weight ratio of the unstretched fibers in the first batt fiber layer 20 is, for example, 70% by mass or more, preferably 80% by mass or more, preferably 100% by mass.

又，構成第1毛絮纖維層20之毛絮纖維的纖度(平均)並無特別限定，可為例如0.8~11dtex，且宜為2~6dtex。透過使毛絮纖維之纖度在上述下限値以上，可將軟化平滑化處理後之外表面21做的更平滑。另一方面，透過使毛絮纖維之纖度在上述上限値以下，可增加纖維根數，而可使外表面21緻密。In addition, the fineness (average) of the fluff fibers constituting the first fluff fiber layer 20 is not particularly limited, and may be, for example, 0.8 to 11 dtex, and preferably 2 to 6 dtex. The outer surface 21 after softening and smoothing treatment can be made smoother by making the fineness of the fluff fibers more than the above-mentioned lower limit value. On the other hand, by making the fineness of the fluff fibers below the above-mentioned upper limit value, the number of fibers can be increased, and the outer surface 21 can be made dense.

第1毛絮纖維層20之基重並無特別限定，可為例如80~200g/m2 ，且宜為100~150g/m2 。當第1毛絮纖維層20之基重在上述下限値以下時，根據熱壓用緩衝材1之材料構成，有時第1毛絮纖維層20會容易受到基材10之表面形狀的影響，結果便是會降低第1毛絮纖維層20的表面平滑性。另一方面，若第1毛絮纖維層20之基重超過上述上限値，由於第1毛絮纖維層20幾乎不賦予緩衝性，因此根據熱壓用緩衝材1之構成，與沒有同基重之第1毛絮纖維層20者相比，有時會降低緩衝性。The basis weight of the first batt fiber layer 20 is not particularly limited, and may be, for example, 80 to 200 g/m 2 , and preferably 100 to 150 g/m 2 . When the basis weight of the first batt fiber layer 20 is below the above lower limit value, the first batt fiber layer 20 may be easily affected by the surface shape of the base material 10 depending on the material composition of the buffer material 1 for hot pressing. As a result, the surface smoothness of the first batt fiber layer 20 is lowered. On the other hand, if the basis weight of the first batt fiber layer 20 exceeds the above-mentioned upper limit value, since the first batt fiber layer 20 hardly imparts cushioning properties, according to the configuration of the buffer material 1 for hot pressing, the basis weight is the same as that without Compared with the first batt fiber layer 20, the cushioning properties may be lowered.

此外，如圖2所示，熱壓用緩衝材1通常是配置成第1毛絮纖維層20之外表面21是對著熱盤100側。藉此，可做出優異之熱盤100與熱壓用緩衝材1之間的剝離性。Moreover, as shown in FIG. 2, the buffer material 1 for hot pressing is normally arrange|positioned so that the outer surface 21 of the 1st fluff fiber layer 20 may face the hot plate 100 side. Thereby, excellent releasability between the hot plate 100 and the buffer material 1 for hot pressing can be obtained.

第2毛絮纖維層30是配置在與基材10之第1毛絮纖維層20側呈相對側之主面。第2毛絮纖維層30是藉由將毛絮纖維利用針軋使其纏結而形成。The second batt fiber layer 30 is arranged on the main surface on the opposite side to the first batt fiber layer 20 side of the base material 10 . The second batt fiber layer 30 is formed by entangling the batt fibers by needle rolling.

構成第2毛絮纖維層30之毛絮纖維並無特別限定，可使用上述之未延伸的纖維，或上述毛氈層14可使用之各種纖維。其中，第2毛絮纖維層30在毛絮纖維方面含有未延伸之纖維，且宜含有未延伸芳香族聚醯胺纖維、更佳是含有未延伸間位系芳香族聚醯胺纖維，此時，後述之氣密片層的密著性可變得更高。The batt fibers constituting the second batt fiber layer 30 are not particularly limited, and the above-described unstretched fibers or various fibers that can be used for the above-described felt layer 14 can be used. Wherein, the second fluff fiber layer 30 contains unstretched fibers in fluff fibers, and preferably contains unstretched aromatic polyamide fibers, more preferably contains unstretched meta-aromatic polyamide fibers. , the adhesion of the airtight sheet layer described later can be made higher.

又，構成第2毛絮纖維層30之毛絮纖維的纖度(平均)並無特別限定，可為例如0.8~11dtex，且宜為2~6dtex。In addition, the fineness (average) of the fluff fibers constituting the second fluff fiber layer 30 is not particularly limited, and may be, for example, 0.8 to 11 dtex, and preferably 2 to 6 dtex.

第2毛絮纖維層30之基重並無特別限定，可為例如80~200g/m2 ，且宜為100~150g/m2 。The basis weight of the second batt fiber layer 30 is not particularly limited, and may be, for example, 80 to 200 g/m 2 , and preferably 100 to 150 g/m 2 .

配置第2毛絮纖維層30的一個理由可舉，防止反覆使用熱壓用緩衝材1時翹曲的發生。亦即，熱壓用緩衝材1會因使用時之反覆壓製成形的熱而在熱壓用緩衝材1之第1毛絮纖維層20側及第2毛絮纖維層30側產生收縮差，而有時會在熱壓用緩衝材1發生翹曲。從防止熱壓用緩衝材1之翹曲的觀點來看，第2毛絮纖維層30之構成宜與第1毛絮纖維層20相同。One reason for arranging the second batt fiber layer 30 is to prevent the occurrence of warpage when the buffer material 1 for hot pressing is repeatedly used. That is, the heat-pressing buffer material 1 may have a difference in shrinkage between the first fluff fiber layer 20 side and the second fluff fiber layer 30 side of the hot-pressing buffer material 1 due to the heat of repeated press molding during use, and Warpage may occur in the buffer material 1 for hot pressing. From the viewpoint of preventing the warpage of the buffer material 1 for hot pressing, the configuration of the second fluff fiber layer 30 is preferably the same as that of the first fluff fiber layer 20 .

氣密片層40是配置在與第2毛絮纖維層30之基材10側呈相對側的面。氣密片層40藉由以纖維片或樹脂薄膜來構成，可密著在第2毛絮纖維層30，且同時維持高氣密性，並有助於降低熱壓用緩衝材1之通氣度。因此，再加上上述之在第1毛絮纖維層20外表面21之氣密性，在自動堆載時，即便是以較弱的吸引力，熱壓用緩衝材1仍可被吸引器吸引、保持。亦即，熱壓用緩衝材1在自動堆載時之運送性優異。The airtight sheet layer 40 is arranged on the surface opposite to the base material 10 side of the second batt fiber layer 30 . The airtight sheet layer 40 is composed of a fiber sheet or a resin film, which can be adhered to the second batting fiber layer 30, maintains high airtightness, and helps to reduce the air permeability of the buffer material 1 for hot pressing . Therefore, in addition to the above-mentioned airtightness on the outer surface 21 of the first batt fiber layer 20, during automatic stacking, even with a weak suction force, the buffer material 1 for hot pressing can still be sucked by the suction device ,Keep. That is, the buffer material 1 for hot pressing is excellent in the transportability at the time of automatic stacking.

氣密片層40可藉由將纖維片或樹脂薄膜在第2毛絮纖維層30進行熱壓著或熱融著來形成。纖維片可為例如經抄造的紙狀片，亦即，溼式不織布等。又，構成纖維片之纖維材料並無特別限定，可藉由具有耐熱性之樹脂材料，例如宜為芳香族聚醯胺來構成，且可使用例如間位系芳香族聚醯胺及/或對位系芳香族聚醯胺。樹脂薄膜並無特別限定，可使用例如氟系樹脂薄膜，具體而言，可使用乙烯・四氟乙烯共聚物、四氟乙烯・六氟丙烯共聚物、聚四氟乙烯、聚偏二氟乙烯、聚氟乙烯、全氟烷氧基氟樹脂等。The airtight sheet layer 40 can be formed by heat-bonding or heat-melting a fiber sheet or a resin film on the second batt fiber layer 30 . The fibrous sheet may be, for example, a paper-like sheet that has been scribbled, that is, a wet nonwoven fabric or the like. In addition, the fiber material constituting the fiber sheet is not particularly limited, and can be composed of a resin material having heat resistance, such as aromatic polyamide, for example, and meta-aromatic polyamide and/or para-aromatic polyamide can be used, for example. The position is an aromatic polyamide. The resin film is not particularly limited. For example, a fluorine-based resin film can be used. Specifically, ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, polytetrafluoroethylene, polyvinylidene fluoride, Polyvinyl fluoride, perfluoroalkoxy fluororesin, etc.

又，氣密片層40之表面粗度Ra並無特別限定，例如為2~7μm，且宜為4~6μm。藉此，在自動堆載裝置時，在令纖維片層40之外表面41為吸引面且吸引到吸引器時，可良好保持吸引器與外表面41的真空狀態。Moreover, the surface roughness Ra of the airtight sheet layer 40 is not specifically limited, For example, it is 2-7 micrometers, Preferably it is 4-6 micrometers. Therefore, in the automatic stacking device, when the outer surface 41 of the fiber sheet layer 40 is used as the suction surface and sucked to the suction device, the vacuum state of the suction device and the outer surface 41 can be well maintained.

氣密片層40之基重並無特別限定，可為例如40~80g/m2 ，且宜為50~70g/m2 。 氣密片層40之厚度並無特別限定，可為例如25~200μm，且宜為50~100μm。The basis weight of the airtight sheet layer 40 is not particularly limited, and may be, for example, 40 to 80 g/m 2 , and preferably 50 to 70 g/m 2 . The thickness of the airtight sheet layer 40 is not particularly limited, and may be, for example, 25 to 200 μm, and preferably 50 to 100 μm.

具有以上構成之熱壓用緩衝材1之根據JIS L 1096所規定之弗雷澤型法的通氣度並無特別限定，可為例如1.0cm3 /cm2 /sec以下，且宜為0.2cm3 /cm2 /sec以下、以0.0cm3 /cm2 /sec為佳。藉此，可做出更優異的熱壓用緩衝材1在自動堆載時之運送性。通氣度的下限値並無特別限定，亦可為例如0cm3 /cm2 /sec。此外，當熱壓用緩衝材之通氣度在0.3cm3 /cm2 /sec以上時，根據所使用之自動堆載機的構成，有時在自動運送上會產生問題。The air permeability of the hot-pressing buffer material 1 having the above-mentioned constitution according to the Fraser-type method specified in JIS L 1096 is not particularly limited, and may be, for example, 1.0 cm 3 /cm 2 /sec or less, and preferably 0.2 cm 3 /cm 2 /sec or less, preferably 0.0cm 3 /cm 2 /sec. Thereby, more excellent transportability of the buffer material 1 for hot pressing during automatic stacking can be achieved. The lower limit of the air permeability is not particularly limited, and may be, for example, 0 cm 3 /cm 2 /sec. In addition, when the air permeability of the buffer material for hot pressing is 0.3 cm 3 /cm 2 /sec or more, there may be problems in automatic transportation depending on the configuration of the automatic stacker to be used.

又，熱壓用緩衝材1之密度並無特別限定，可為例如0.3~0.7g/cm3 ，且宜為0.4~0.6g/cm3 。藉此，從熱壓用緩衝材1之使用初期到使用末期，熱壓時之熱傳導性會穩定(熱傳導變化的差異會小)、又，可持續優異的緩衝性。In addition, the density of the buffer material 1 for hot pressing is not particularly limited, and may be, for example, 0.3 to 0.7 g/cm 3 , and preferably 0.4 to 0.6 g/cm 3 . Thereby, the thermal conductivity during hot pressing is stabilized from the initial stage of use to the final stage of use of the shock absorbing material 1 for hot pressing (the difference in thermal conductivity change is small), and excellent shock absorbing properties can be maintained.

又，熱壓用緩衝材1之厚度並無特別限定，可為例如1~8mm，且宜為2~6mm。 熱壓用緩衝材1之尺寸並無特別限定，可根據其用途或所使用之熱盤而適宜設定、例如，長邊方向、寬度方向各自的長度可為3.6×1.3m。Moreover, the thickness of the buffer material 1 for hot pressing is not specifically limited, For example, 1 to 8 mm may be sufficient, and 2 to 6 mm is suitable. The size of the buffer material 1 for hot pressing is not particularly limited, and can be appropriately set according to the application or the hot plate used. For example, the lengths in the longitudinal direction and the width direction can be 3.6×1.3 m.

以上說明之熱壓用緩衝材1藉由第1毛絮纖維層20之外表面被軟化平滑化，而可防止在外表面21之毛絮纖維的起毛。另一方面，由於第1毛絮纖維層20是以毛絮纖維所構成，因此熱壓用緩衝材1在與熱盤之剝離性上是優異的。The buffer material 1 for hot pressing described above can prevent fluffing of the batt fibers on the outer surface 21 by softening and smoothing the outer surface of the first batt fiber layer 20 . On the other hand, since the first fluff fiber layer 20 is composed of fluff fibers, the buffer material 1 for hot pressing is excellent in releasability from the hot plate.

進一步，熱壓用緩衝材1透過具有氣密片層40，達成低的熱壓用緩衝材1之通氣度，再加上第1毛絮纖維層20之外表面21的氣密性，熱壓用緩衝材1在自動堆載時，即便以較弱的吸引力仍能被吸引器吸引、保持。亦即，熱壓用緩衝材1在自動堆載時之運送性上優異。又，熱壓用緩衝材1不只是從外表面41側，即便是從外表面21側進行吸引而進行自動運送時，運送性仍優異。特別是，近年來，熱壓用緩衝材一般來說有輕量化的傾向，因此在自動堆載裝置上亦有以較以往較弱之吸引力進行吸引的傾向。例如，專利文獻1揭示在500mmH2 O之條件下進行吸引，然現在是例如以50~100吋水柱左右的真空度下進行吸引。又，根據吸引器，在到達所欲之真空度後會停止吸引。即便在如此情況下，熱壓用緩衝材1仍可容易的被自動堆載裝置之吸引器吸引、保持。Further, the buffer material 1 for hot pressing has an airtight sheet layer 40 to achieve a low air permeability of the buffer material 1 for hot pressing. When the buffer material 1 is automatically stacked, it can be attracted and held by the suction device even with a weak suction force. That is, the buffer material 1 for hot pressing is excellent in conveyability at the time of automatic stacking. Moreover, the buffer material 1 for hot pressing is excellent in conveyability even when it is automatically conveyed by suction not only from the outer surface 41 side but also from the outer surface 21 side. In particular, in recent years, the shock absorbing material for hot pressing generally tends to be lighter in weight, and therefore, it tends to be attracted by an automatic stacking device with a weaker suction force than before. For example, Patent Document 1 discloses that suction is performed under the condition of 500 mmH 2 O, but at present, suction is performed under a vacuum degree of about 50 to 100 inches of water, for example. Also, depending on the suction device, suction stops when the desired degree of vacuum is reached. Even in such a case, the buffer material 1 for hot pressing can be easily attracted and held by the suction device of the automatic stacking device.

熱壓用緩衝材1，如上所述，可用於例如製造具有印刷佈線板等積層構造之電子零件(積層製品)，更具體而言，用於成形壓製。例如，積層製品之一例如下述。此外，積層製品除了以下所示例子之外，其他還有各式各樣的製品。As mentioned above, the buffer material 1 for hot pressing can be used for the manufacture of electronic components (laminated products) having a laminated structure such as a printed wiring board, and more specifically, for forming and pressing. For example, one of the laminates is as follows. In addition to the example shown below, the laminated product has various other products.

(1)成為印刷佈線板之基板的積層板： 此積層板可舉由牛皮紙與酚樹脂所構成之紙酚積層板或由玻璃纖維之織布與環氧樹脂所構成之玻璃環氧積層板等。 (2)印刷佈線板： 此印刷佈線板可舉在基板之單面形成有導體圖案之單面印刷佈線板、在基板之兩面形成有導體圖案之兩面印刷佈線板、或不只在基板之外面且在內部亦形成有導體圖案之多層印刷佈線板等。 (3)平板顯示器(flat panel display)： 平板顯示器可舉例如液晶顯示器、電致發光(Electroluminescence)等。 (4)半導體封裝體： 半導體封裝體可舉例如與晶片幾乎同大小的晶片大小封裝體(Chip Size Package(CSP))等。(1) Laminates to be the substrates of printed wiring boards: The laminates include paper-phenol laminates composed of kraft paper and phenolic resins, glass-epoxy laminates composed of glass fiber woven fabrics and epoxy resins, etc. . (2) Printed wiring board: The printed wiring board includes a single-sided printed wiring board in which a conductor pattern is formed on one side of a substrate, a double-sided printed wiring board in which a conductor pattern is formed on both sides of the substrate, or not only on the outer surface of the substrate but also A multilayer printed wiring board and the like with conductor patterns are also formed inside. (3) Flat panel display: As a flat panel display, a liquid crystal display, electroluminescence, etc. are mentioned, for example. (4) Semiconductor package: As a semiconductor package, the chip size package (Chip Size Package (CSP)) etc. which are substantially the same size as a wafer are mentioned, for example.

此外，關於本發明之熱壓用緩衝材不僅可用於上述用途，亦可用於製造具有積層材、裝飾板、積成材等積層構造之建材。此時，關於本發明之熱壓用緩衝材可因應用途而適宜變更構成。In addition, the buffer material for hot pressing of the present invention can be used not only for the above-mentioned applications, but also for the production of building materials having a laminated structure such as a laminated material, a decorative board, and a laminated material. In this case, the structure of the buffer material for hot pressing of the present invention can be appropriately changed according to the application.

＜3.熱壓用緩衝材之製造方法＞ 接著，將以上述熱壓用緩衝材1之製造方法作為一例說明關於本發明之熱壓用緩衝材之製造方法。<3. Manufacturing method of the buffer material for hot pressing> Next, the manufacturing method of the buffer material for hot pressing concerning this invention is demonstrated using the manufacturing method of the said buffer material 1 for hot pressing as an example.

關於本發明熱壓用緩衝材之製造方法具有如下步驟：獲得積層體之步驟，在基材之至少一主面配置毛絮纖維並進行針刺而在前述基材之至少一主面形成毛絮纖維層，獲得積層體；及進行壓製的步驟，在前述積層體中前述基材之另一主面側配置有氣密片的狀態下，在前述毛絮纖維之玻璃轉移溫度以上之溫度下進行壓製。The manufacturing method of the buffer material for hot pressing of the present invention includes the steps of: obtaining a layered body, arranging fluff fibers on at least one main surface of a base material, and performing needle punching to form fluff on at least one main surface of the base material A fiber layer to obtain a laminate; and the step of pressing is performed at a temperature higher than the glass transition temperature of the fluff fibers in a state where an airtight sheet is arranged on the other main surface side of the base material in the laminate suppress.

在本實施形態中，首先，在獲得上述積層體的步驟之前準備基材10。基材10可如下獲得：在上述基布12將作為短纖維之由毛絮纖維構成的纖維網配置在基布12上，並利用針軋使其互相纏結，同時使其纏結到基布12上，藉此形成毛氈層14而獲得。In this embodiment, first, the base material 10 is prepared before the step of obtaining the above-mentioned layered product. The base material 10 can be obtained by disposing a fiber web composed of fluff fibers as short fibers on the base cloth 12 on the above-mentioned base cloth 12, and entangling them with each other by needle rolling, and at the same time entangling them on the base cloth 12 , thereby forming a felt layer 14 to obtain.

在接下來的步驟中，在基材10的兩面配置毛絮纖維並進行針刺而在基材10的兩面形成毛絮纖維層20、30，獲得積層體。具體而言，在基材10之一主面配置毛絮纖維並進行針刺，接著，在基材10之另一主面配置毛絮纖維並進行針刺，依序獲得第1毛絮纖維層20及第2毛絮纖維層30。此外，第1毛絮纖維層20與第2毛絮纖維層30之任一先形成皆可。In the next step, the fluff fiber layers 20 and 30 are formed on both surfaces of the base material 10 by arranging fluff fibers on both surfaces of the base material 10 and performing needle punching, thereby obtaining a laminate. Specifically, fluff fibers are placed on one main surface of the base material 10 and needle punching is performed, and then the fluff fibers are placed on the other main surface of the base material 10 and needle punched to obtain a first fluff fiber layer in sequence. 20 and the second batt fiber layer 30 . In addition, any one of the 1st batt fiber layer 20 and the 2nd batt fiber layer 30 may be formed first.

在接下來的步驟中，針對獲得之積層體，在與第1毛絮纖維層20呈相對側之主面上，亦即，在第2毛絮纖維層30上配置有氣密片的狀態下，在構成第1毛絮纖維層20之毛絮纖維之玻璃轉移溫度以上的溫度下進行壓製。藉此，在第2纖維層30上氣密片會密著且並形成氣密片層40，同時第1毛絮纖維層20之外表面21會軟化平滑化。In the next step, with respect to the obtained laminate, the main surface on the opposite side to the first batt fiber layer 20 , that is, in a state where the airtight sheet is arranged on the second batt fiber layer 30 , and pressing is performed at a temperature higher than or equal to the glass transition temperature of the batt fibers constituting the first batt fiber layer 20 . Thereby, the air-tight sheet is adhered to the second fiber layer 30 to form the air-tight sheet layer 40, and the outer surface 21 of the first fluff fiber layer 20 is softened and smoothed.

壓製溫度若為構成第1毛絮纖維層20之毛絮纖維之玻璃轉移溫度以上的溫度，則無特別限定，然宜為構成第1毛絮纖維層20之毛絮纖維之玻璃轉移溫度以上且在分解溫度或熔融溫度以下。具體而言，壓製溫度為例如270~330℃、且宜為280~300℃。The pressing temperature is not particularly limited as long as it is a temperature equal to or higher than the glass transition temperature of the fluff fibers constituting the first fluff fiber layer 20, but it is preferably equal to or higher than the glass transition temperature of the fluff fibers constituting the first fluff fiber layer 20. below the decomposition temperature or melting temperature. Specifically, the pressing temperature is, for example, 270 to 330°C, and preferably 280 to 300°C.

壓製壓並無特別限定，然從在使用熱壓用緩衝材1時之熱傳導性的穩定或緩衝性之持續的觀點來看，為例如5~40kg/cm2 ，且宜為10~20kg/cm2 。 壓製時間並無特別限定，而可適宜設定，可為例如10~40分、且宜為15~25分。The pressing pressure is not particularly limited, but it is, for example, 5 to 40 kg/cm 2 , and preferably 10 to 20 kg/cm, from the viewpoint of the stabilization of thermal conductivity or the continuation of cushioning properties when the buffer material 1 for hot pressing is used. 2 . The pressing time is not particularly limited, and can be appropriately set, for example, 10 to 40 minutes, and preferably 15 to 25 minutes.

藉由以上步驟，可獲得熱壓用緩衝材1。此外，針對獲得之熱壓用緩衝材1，可因應用途而適宜裁切，亦可進行洗淨等的後處理。Through the above steps, the buffer material 1 for hot pressing can be obtained. In addition, the obtained buffer material 1 for hot pressing can be appropriately cut according to the application, and post-processing such as washing can also be performed.

＜4.變形例＞ 接著，針對上述熱壓用緩衝材1之變形例進行說明。圖4是有關本發明變形例之熱壓用緩衝材的剖面圖。圖4所示之熱壓用緩衝材1A省略第2毛絮纖維層30，且氣密片層40是直接配置在與基材10之第1毛絮纖維層20側呈相對側之主面，前述特點與熱壓用緩衝材1相異。<4. Modification> Next, the modification of the buffer material 1 for hot pressing mentioned above is demonstrated. 4 is a cross-sectional view of a buffer material for hot pressing according to a modification of the present invention. In the buffer material 1A for hot pressing shown in FIG. 4 , the second batt fiber layer 30 is omitted, and the air-tight sheet layer 40 is directly disposed on the main surface opposite to the first batt fiber layer 20 side of the base material 10 . The aforementioned features are different from those of the buffer material 1 for hot pressing.

在本變形例中，由於熱壓用緩衝材1A具備如上述之第1毛絮纖維層20，因此亦可防止毛絮纖維之起毛，又，與熱盤之剝離性優異。熱壓用緩衝材1透過具有氣密片層40，再加上第1毛絮纖維層20之外表面21的氣密性，而在自動堆載時之運送性上是優異的。In this modification, since the buffer material 1A for hot pressing includes the first fluff fiber layer 20 as described above, fluffing of the fluff fibers can also be prevented, and the releasability from the hot plate is excellent. The buffer material 1 for hot pressing is excellent in transportability during automatic stacking by having the airtight sheet layer 40 and the airtightness of the outer surface 21 of the first fluff fiber layer 20 .

此外，如上述之第2毛絮纖維層30主要是配置來用以抑制熱壓用緩衝材1之使用時的翹曲。因此，熱壓用緩衝材1A適用在下述情況：翹曲之發生不視為問題的情況、或具有即便省略第2毛絮纖維層也可透過各層之材料構成等而抑制翹曲之構造的情況。Moreover, the 2nd fluff fiber layer 30 mentioned above is arrange|positioned mainly to suppress the warpage at the time of use of the buffer material 1 for hot pressing. Therefore, the hot-pressing buffer material 1A is suitable for cases where the occurrence of warpage is not a problem, or when the second batt fiber layer is omitted, the material structure of each layer can be permeated to suppress warpage, etc. .

又，熱壓用緩衝材1A在獲得上述積層體之步驟中除了省略第2毛絮纖維層30之形成之外，其餘可與熱壓用緩衝材1相同來製造。亦即，在壓製時，在與積層體之第1毛絮纖維層20呈相對側之主面配置氣密片。在此情況下，為了做出堅固的基材10與氣密片層40之結合，可在基材10與氣密片層40之間配置接著劑，使之相互接著。 [實施例]In addition, the buffer material 1A for hot pressing can be produced in the same manner as the buffer material 1 for hot pressing except that the formation of the second batt fiber layer 30 is omitted in the step of obtaining the above-mentioned laminated body. That is, at the time of pressing, the airtight sheet is arranged on the main surface on the opposite side to the first batt fiber layer 20 of the laminate. In this case, in order to make a strong bond between the base material 10 and the airtight sheet layer 40 , an adhesive may be arranged between the base material 10 and the airtight sheet layer 40 to be bonded to each other. [Example]

以下，透過實施例以更具體說明本發明，然本發明並未受到該等實施例所限定。Hereinafter, the present invention will be described in more detail through examples, but the present invention is not limited by these examples.

＜1.製造熱壓用緩衝材＞ (1)準備基材 首先，在基材之基布方面，是準備經線及緯線是由間位系芳香族聚醯胺纖維(m-聚芳醯胺纖維)所構成之織布(線纖度：2/20S(2股之20號手細紗(spun yarn)、組織：1/1平紋織、基重：100g/m2 )。接著，將m-聚芳醯胺纖維(纖度：2.2dtex、纖維長：51mm)以兩面合計為900g/m2 之基重來積層，製造在織布之兩面具有毛氈層的基材。<1. Manufacture of buffer material for hot pressing> (1) Preparation of base material First, in terms of the base fabric of the base material, the warp and weft threads are prepared by meta-aromatic polyamide fibers (m-polyaramide fibers). fiber) (thread fineness: 2/20S (2 strands of 20-gauge spun yarn), weave: 1/1 plain weave, basis weight: 100 g/m 2 ). Next, m-polyethylene Aramid fibers (fineness: 2.2 dtex, fiber length: 51 mm) were laminated with a basis weight of 900 g/m 2 in total on both sides to produce a base material having felt layers on both sides of the woven fabric.

(2)形成毛絮纖維層 接著，在第1及第2毛絮纖維層之毛絮纖維方面，是準備表1所示纖度之未延伸m-聚芳醯胺纖維(纖維長：51mm、玻璃轉移溫度：270℃)，在基材之兩面形成每一面為150g/m2 之基重的第1及第2毛絮纖維層，而獲得在兩面具有第1及第2毛絮纖維層的積層體。此外、在實施例5並未形成第2毛絮纖維層。 此外，第1及第2毛絮纖維層之形成是藉由在基材上配置上述毛絮纖維作為預毛絮纖維層、進行針刺，並將基材與預毛絮纖維層一體化來進行。(2) Formation of the batt fiber layer Next, as the batt fibers of the first and second batt fiber layers, unstretched m-polyaramid fibers (fiber length: 51 mm, glass) having the fineness shown in Table 1 were prepared Transfer temperature: 270°C), the first and second batt fiber layers each with a basis weight of 150 g/m 2 are formed on both sides of the substrate to obtain a laminate with the first and second batt fiber layers on both sides body. In addition, in Example 5, the 2nd fluff fiber layer was not formed. In addition, the formation of the first and second batt fiber layers is performed by arranging the above-mentioned batt fibers as a pre-batt fiber layer on a base material, performing needle punching, and integrating the base material and the pre-batt fiber layer. .

(3)壓製 接著，在第2毛絮纖維層上配置有聚芳醯胺紙(m-聚芳醯胺紙、厚度：178μm)的狀態下進行壓製，使作為氣密片層之聚芳醯胺紙接著到第2毛絮纖維層上，同時進行第1毛絮纖維層之外表面的軟化平滑化處理。壓製條件是如表1所示。此外，在實施例5中，是使用乙烯・四氟乙烯共聚物薄膜(ETFE薄膜、厚度：50μm)取代聚芳醯胺紙，配置在與基材之第1毛絮纖維層呈相對側之面，並進行壓製。又，在比較例1中，是在第2毛絮纖維層上沒有配置聚芳醯胺紙之下進行壓製。又，在比較例3中，是將聚芳醯胺紙配置在積層體之兩面並進行壓製。依上獲得關於實施例1~5、比較例1~3之熱壓用緩衝材。(3) Pressing Next, pressing was performed in a state in which polyaramide paper (m-aramide paper, thickness: 178 μm) was arranged on the second batt fiber layer, and the polyaramide as an airtight sheet layer was pressed. The amine paper is next to the second batt fiber layer, and at the same time, the softening and smoothing treatment of the outer surface of the first batt fiber layer is performed. The pressing conditions are as shown in Table 1. In addition, in Example 5, an ethylene-tetrafluoroethylene copolymer film (ETFE film, thickness: 50 μm) was used instead of the polyaramide paper, and it was arranged on the surface opposite to the first batt fiber layer of the base material. , and suppress. In addition, in Comparative Example 1, pressing was performed without disposing the polyaramid paper on the second batt fiber layer. In addition, in the comparative example 3, the polyaramide paper was arrange|positioned on both surfaces of a laminated body, and it pressed. The buffer materials for hot pressing of Examples 1 to 5 and Comparative Examples 1 to 3 were obtained as described above.

＜2.評價＞ (1)表面粗度 針對各實施例及各比較例之熱壓用緩衝材，使用表面粗度輪廓形狀測定器(SURFCOM 480A：東京精密公司製)，並基於JIS-B0633，測定第1毛絮纖維層之外表面的表面粗度Ra。結果顯示於表1。此外，在表中，就關於比較例3之熱壓用緩衝材，是顯示配置在第1毛絮纖維層上之氣密片的表面粗度。<2. Evaluation> (1) Surface Roughness For the buffer material for hot pressing of each example and each comparative example, a surface roughness profile measuring device (SURFCOM 480A: manufactured by Tokyo Seiki Co., Ltd.) was used, and based on JIS-B0633, The surface roughness Ra of the outer surface of the 1st fluff fiber layer was measured. The results are shown in Table 1. In addition, the table shows the surface roughness of the airtight sheet arranged on the first batt fiber layer with respect to the buffer material for hot pressing of Comparative Example 3.

(2)通氣度 針對各實施例及各比較例之熱壓用緩衝材，使用通氣度計(弗雷澤滲透儀(frazier permeameter)：東洋精密公司製)，並藉由JIS L 1096所規定之弗雷澤型法來測定通氣度。此外，在測定通氣度時，是設吸引面為第1毛絮纖維層側。結果顯示在表1。表中附有括弧的數値是實際測定到的通氣度，未附有括弧的數値則是將實際測定到的通氣度以JIS L 1096所規定之表示方法來表示的數値。(2) Air permeability The air permeability meter (frazier permeameter: manufactured by Toyo Precision Co., Ltd.) was used for the hot-pressing buffer material of each example and each comparative example, and was regulated by JIS L 1096. Fraser-type method to measure air permeability. In addition, when measuring the air permeability, the suction surface was set as the side of the first fluff fiber layer. The results are shown in Table 1. The values with parentheses in the table are the air permeability actually measured, and the values without parentheses are the values expressed by the method specified in JIS L 1096 for the actually measured air permeability.

(3)毛絮纖維的寬高比 利用掃描型電子顯微鏡觀察第1毛絮纖維層之外表面的剖面，測定構成第1毛絮纖維層之外表面之毛絮纖維的寬高比(熱壓用緩衝材之平面方向的徑/熱壓用緩衝材之厚度方向的徑)。結果顯示在表1。(3) Aspect ratio of fluff fibers The cross section of the outer surface of the first fluff fiber layer was observed with a scanning electron microscope, and the aspect ratio of the fluff fibers constituting the outer surface of the first fluff fiber layer was measured (hot pressing The diameter of the buffer material used in the plane direction/the diameter of the thickness direction of the buffer material used for hot pressing). The results are shown in Table 1.

(4)起毛 針對各實施例及各比較例之熱壓用緩衝材，使用顯微鏡(digital microscope VHX-900：KEYENCE公司製)，並觀察從第1毛絮纖維層之表面突出的短纖維。此時，從第1毛絮纖維層之表面，將短纖維是突出0.5mm以上之長度者，或短纖維以環狀(loop)突出者設為評價「B」，其他則設為評價「A」。結果顯示在表1。(4) Fluff The short fibers protruding from the surface of the first fluff fiber layer were observed using a microscope (digital microscope VHX-900: manufactured by KEYENCE Corporation) for the buffer material for hot pressing of each Example and each Comparative Example. At this time, from the surface of the first batt fiber layer, the short fibers protruded by a length of 0.5 mm or more, or the short fibers protruded in a loop (loop) were evaluated as "B", and the others were evaluated as "A" ". The results are shown in Table 1.

(5)剝離性 針對各實施例及各比較例之熱壓用緩衝材，在具有上側熱盤與下側熱盤並於上側熱盤附有不鏽鋼板(SUS板)且透過上側熱盤之上下動作可進行壓製的熱盤壓製裝置中，以熱壓用緩衝材之第1毛絮纖維層表面與SUS板接觸之方式將熱壓用緩衝材配置在SUS板與下側熱盤間，並實施熱盤壓製(壓製條件:220℃-40kg/cm2 -60分)，之後，放開壓製。此時，計測各緩衝材從SUS板直到自然剝落的時間，並令該時間為3秒以下者為評價「A」，令超過3秒者為評價「B」。結果顯示在表1。(5) Peelability With regard to the buffer material for hot pressing of each example and each comparative example, a stainless steel plate (SUS plate) was attached to the upper hot plate and penetrated through the upper and lower hot plates. In the hot plate pressing device capable of pressing, the buffer material for hot pressing is arranged between the SUS plate and the lower hot plate so that the surface of the first fluff fiber layer of the buffer material for hot pressing is in contact with the SUS plate, and the Hot plate pressing (pressing conditions: 220°C-40kg/cm 2 -60 minutes), after which the pressing is released. At this time, the time until the natural peeling of each buffer material from the SUS plate was measured, and the evaluation "A" was made when the time was 3 seconds or less, and the evaluation "B" was made when the time exceeded 3 seconds. The results are shown in Table 1.

(6)運送性 針對各實施例及各比較例之熱壓用緩衝材，按直徑100mm取樣(sampling)，並使直徑50mm之矽酮橡膠製吸盤吸附到各熱壓用緩衝材之第1毛絮纖維層表面的中心。接著，通過吸盤提起各熱壓用緩衝材。此時，令提起熱壓用緩衝材者為評價「A」、令未提起者為評價「B」。結果顯示在表1。(6) Transportability With respect to the buffer materials for hot pressing of each of the Examples and Comparative Examples, sampling was performed at a diameter of 100 mm, and a suction cup made of silicone rubber with a diameter of 50 mm was adsorbed to the first hair of each buffer material for hot pressing. The center of the surface of the batt fiber layer. Next, each buffer material for hot pressing is lifted up by the suction cup. At this time, let the person who raised the buffer material for hot pressing be the evaluation "A", and let the person who did not raise it be the evaluation "B". The results are shown in Table 1.

[表1]

Figure 02_image001
[Table 1]
Figure 02_image001

如表1所示，有關實施例1~5之熱壓用緩衝材可抑制毛絮纖維層之起毛，且同時剝離性及運送性優異。相對於此，有關比較例1之熱壓用緩衝材因不具有氣密片層，而運送性並不充分。又，針對有關比較例2之熱壓用緩衝材，是以較毛絮纖維之玻璃轉移溫度還低之溫度進行壓製處理，結果是無法充分進行軟化平滑化處理。因此，有關比較例2之熱壓用緩衝材不能抑制毛絮纖維之起毛、又，通氣度亦變大而運送性不佳。As shown in Table 1, the cushioning materials for hot pressing of Examples 1 to 5 can suppress the fluff of the fluff fiber layer, and are excellent in peelability and transportability at the same time. On the other hand, since the buffer material for hot pressing according to Comparative Example 1 does not have an airtight sheet layer, the transportability is insufficient. In addition, about the buffer material for hot pressing of Comparative Example 2, the pressing process was performed at a temperature lower than the glass transition temperature of the fluff fiber, and as a result, the softening and smoothing process could not be sufficiently performed. Therefore, the cushioning material for hot pressing according to Comparative Example 2 could not suppress the fluff of the fluff fibers, and the air permeability was also increased, resulting in poor transportability.

進一步，有關比較例3之熱壓用緩衝材是在第1毛絮纖維層上配置氣密片層，結果是不能將第1毛絮纖維層之外表面軟化平滑化，又，第1毛絮纖維層並未露出外表面。結果便是有關比較例3之熱壓用緩衝材無法具有源自第1毛絮纖維層之適當的外表面凹凸，而剝離性不佳。Furthermore, in the buffer material for hot pressing of Comparative Example 3, the air-tight sheet layer was arranged on the first fluff fiber layer, and as a result, the outer surface of the first fluff fiber layer could not be softened and smoothed. The fiber layer is not exposed to the outer surface. As a result, the shock absorbing material for hot pressing of Comparative Example 3 could not have appropriate outer surface irregularities derived from the first batt fiber layer, and was poor in releasability.

以上是邊參照本案圖式邊針對本發明合適的實施形態進行詳細說明，然本發明並未受限於該等例式。應瞭解，凡本發明所屬技術領域中具通常知識者很顯然可思及在申請專利範圍所記載之技術思想的範疇內的各種變更例或修正例，而該等變更例或修正例當然隸屬於本發明之技術範圍內。The above is a detailed description of suitable embodiments of the present invention with reference to the drawings, but the present invention is not limited to these embodiments. It should be understood that those with ordinary knowledge in the technical field to which the present invention pertains can obviously think of various modifications or amendments within the scope of the technical idea described in the scope of the patent application, and such modifications or amendments of course belong to within the technical scope of the present invention.

1、1A‧‧‧熱壓用緩衝材10‧‧‧基材12‧‧‧基布14‧‧‧毛氈層20‧‧‧第1毛絮纖維層21‧‧‧外表面30‧‧‧第2毛絮纖維層40、40A‧‧‧氣密片層41‧‧‧外表面100‧‧‧熱盤200‧‧‧鏡面板300‧‧‧積層板301‧‧‧預浸體302‧‧‧金屬箔1. 1A‧‧‧Buffer material for hot pressing 10‧‧‧Substrate 12‧‧‧Base cloth 14‧‧‧Felt layer 20‧‧‧First batting fiber layer 21‧‧‧Outer surface 30‧‧‧First 2Fatty fiber layer 40, 40A‧‧‧Airtight sheet layer 41‧‧‧Outer surface 100‧‧‧Hot plate 200‧‧‧Mirror panel 300‧‧‧Laminated board 301‧‧‧Prepreg 302‧‧‧ metal foil

圖1是一示意圖，顯示一關於本發明一實施形態之熱壓用緩衝材之使用狀態的例子。 圖2是一示意圖，顯示一關於本發明一實施形態之熱壓用緩衝材之使用狀態的例子。 圖3是一關於本發明一實施形態之熱壓用緩衝材的剖面圖。 圖4是一關於本發明變形例之熱壓用緩衝材的剖面圖。FIG. 1 is a schematic diagram showing an example of the use state of the buffer material for hot pressing according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of the use state of the buffer material for hot pressing according to an embodiment of the present invention. 3 is a cross-sectional view of a buffer material for hot pressing according to an embodiment of the present invention. 4 is a cross-sectional view of a buffer material for hot pressing according to a modification of the present invention.

1‧‧‧熱壓用緩衝材 1‧‧‧Buffer material for hot pressing

10‧‧‧基材 10‧‧‧Substrate

12‧‧‧基布 12‧‧‧kibu

14‧‧‧毛氈層 14‧‧‧Felt layer

20‧‧‧第1毛絮纖維層 20‧‧‧First batting fiber layer

21‧‧‧外表面 21‧‧‧External surface

30‧‧‧第2毛絮纖維層 30‧‧‧Second batting fiber layer

40‧‧‧氣密片層 40‧‧‧Airtight lamella

Claims (11)

一種熱壓用緩衝材，具有：基材、配置在前述基材之第1主面且外表面經軟化平滑化的毛絮纖維層、與僅配置在前述基材之第2主面側的氣密片層。 A buffer material for hot pressing, comprising: a base material, a fluff fiber layer arranged on the first main surface of the base material and whose outer surface is softened and smoothed, and a gaseous layer arranged only on the second main surface side of the base material dense layer. 如請求項1之熱壓用緩衝材，其中前述毛絮纖維層含有毛絮纖維，且經毛絮纖維之玻璃轉移溫度以上的溫度而軟化平滑化。 The buffer material for hot pressing according to claim 1, wherein the fluff fiber layer contains fluff fibers, and is softened and smoothed at a temperature equal to or higher than the glass transition temperature of the fluff fibers. 一種熱壓用緩衝材，具有：基材、配置在前述基材之第1主面的毛絮纖維層、與僅配置在前述基材之第2主面側的氣密片層；且前述毛絮纖維層之外表面至少一部分是藉由沿著前述外表面成為扁平狀的纖維來構成。 A buffer material for hot pressing, comprising: a base material, a fluff fiber layer disposed on the first main surface of the base material, and an airtight sheet layer disposed only on the second main surface side of the base material; and the wool At least a part of the outer surface of the batt fiber layer is composed of flat fibers along the outer surface. 如請求項1至3中任一項之熱壓用緩衝材，其中前述氣密片層是藉由纖維片或樹脂薄膜來構成。 The buffer material for hot pressing according to any one of claims 1 to 3, wherein the airtight sheet layer is formed of a fiber sheet or a resin film. 如請求項1至3中任一項之熱壓用緩衝材，其中前述毛絮纖維層之外表面的表面粗度Ra為2.5~11μm。 The buffer material for hot pressing according to any one of claims 1 to 3, wherein the surface roughness Ra of the outer surface of the aforementioned fluff fiber layer is 2.5-11 μm. 如請求項1至3中任一項之熱壓用緩衝材，其根據JIS L 1096所規定之弗雷澤型法的通氣度為0.2cm3/cm2/sec以下。 The buffer material for hot pressing according to any one of Claims 1 to 3, which has an air permeability of 0.2 cm 3 /cm 2 /sec or less according to the Fraser type method specified in JIS L 1096. 如請求項1至3中任一項之熱壓用緩衝 材，其中前述毛絮纖維層含有未延伸間位系芳香族聚醯胺纖維。 Buffer for hot pressing according to any one of claims 1 to 3 material, wherein the aforementioned batting fiber layer contains unstretched meta-aromatic polyamide fibers. 如請求項1至3中任一項之熱壓用緩衝材，其中構成前述毛絮纖維層之毛絮纖維的纖度為0.8~11dtex。 The buffer material for hot pressing according to any one of claims 1 to 3, wherein the fineness of the fluff fibers constituting the fluff fiber layer is 0.8 to 11 dtex. 如請求項1至3中任一項之熱壓用緩衝材，其進一步具有配置在前述基材與前述氣密片層之間的毛絮纖維層。 The buffer material for hot pressing according to any one of claims 1 to 3, further comprising a fluff fiber layer disposed between the base material and the airtight sheet layer. 如請求項1至3中任一項之熱壓用緩衝材，其中前述基材含有芳香族聚醯胺纖維。 The buffer material for hot pressing according to any one of claims 1 to 3, wherein the base material contains aromatic polyamide fibers. 一種熱壓用緩衝材之製造方法，具有如下步驟：獲得積層體之步驟：在基材之至少一主面配置毛絮纖維並進行針刺而在前述基材之至少一主面形成毛絮纖維層，獲得積層體；及進行壓製之步驟：在僅於前述積層體中前述基材之另一主面側配置有氣密片的狀態下，在前述毛絮纖維之玻璃轉移溫度以上之溫度下進行壓製。A method for producing a buffer material for hot pressing, comprising the following steps: a step of obtaining a layered body: arranging fluff fibers on at least one main surface of a base material and performing needle punching to form fluff fibers on at least one main surface of the base material layer to obtain a laminate; and a step of pressing: in a state where an airtight sheet is arranged only on the other main surface side of the base material in the laminate, at a temperature higher than the glass transition temperature of the fluff fiber to suppress.
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