JPH0227472B2 - - Google Patents
Info
- Publication number
- JPH0227472B2 JPH0227472B2 JP61106402A JP10640286A JPH0227472B2 JP H0227472 B2 JPH0227472 B2 JP H0227472B2 JP 61106402 A JP61106402 A JP 61106402A JP 10640286 A JP10640286 A JP 10640286A JP H0227472 B2 JPH0227472 B2 JP H0227472B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- pulp
- cellulose
- base paper
- dissolving pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920000875 Dissolving pulp Polymers 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 14
- 238000010009 beating Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 229920001131 Pulp (paper) Polymers 0.000 claims description 9
- 239000011122 softwood Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000123 paper Substances 0.000 description 47
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 18
- 239000000835 fiber Substances 0.000 description 17
- 230000000704 physical effect Effects 0.000 description 8
- 238000004080 punching Methods 0.000 description 8
- 229920002678 cellulose Polymers 0.000 description 7
- 239000002023 wood Substances 0.000 description 7
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011121 hardwood Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 238000010292 electrical insulation Methods 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 238000010411 cooking Methods 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-QTVWNMPRSA-N D-mannopyranose Chemical compound OC[C@H]1OC(O)[C@@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-QTVWNMPRSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- ZOJBYZNEUISWFT-UHFFFAOYSA-N allyl isothiocyanate Chemical compound C=CCN=C=S ZOJBYZNEUISWFT-UHFFFAOYSA-N 0.000 description 1
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 1
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008164 mustard oil Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
Description
〔産業上の利用分野〕
本発明はプリント配線板などにに用いられる積
層板原紙の製法に関するものであり、樹脂含浸性
にすぐれ、打抜加工性、寸法安定性、電気特性の
良好な積層板を得るのに適した紙基材の製法に関
するものである。
〔従来の技術およびその問題点〕
従来プリント配線基板用の紙基材としては、リ
ンター紙、クラフト紙、リンター／クラフト混抄
紙等が用いられている。
近年、電子部品の小型化、高密度化が要求され
るとともに、材料の加工特性、電気特性に対する
要求がより厳格になつてきている。しかしながら
従来の紙基材ではその対応が困難である。
即ち、これら従来の紙基材を原料として、積層
板を製造した場合、リンター紙からのものは電気
絶縁性、打抜加工性は良いが寸法安定性に乏しい
という問題がある。一方、クラフト紙からのもの
は寸法安定性は良いが、打抜加工性、電気絶縁性
に乏しい傾向がある。また混抄紙は両成分の悪い
方の特性が強調される傾向を示す。さらに、紙に
代わる安価な材料もこれまでのところ開発されて
いない。
リンターパルプを原料とする紙は、繊維自体が
屈曲しているので、寸法安定性を改良するのは容
易なことでなく、また価格も木材パルプを原料と
する紙に比べて高値である。
本発明者は斯かる問題に鑑み、木材パルプを原
料としながら高性能の紙基材を得る方法につき研
究の結果、製紙用パルプでなく、溶解パルプを使
用することにより、寸法安定性、打抜加工性、電
気特性など諸物性にすぐれた積層板となりうる紙
基材が得られることをみとめた。溶解パルプと
は、これを原料として種々の化学品と反応させ、
セルロース誘導体を製造するのを本来の目的とし
ている。溶解パルプの語は、上記セルロースの誘
導体としたときの溶剤溶解性に優れていることか
ら来たものである。具体的にはパルプを用いて、
酢酸セルロース、硝酸セルロースなどを得たと
き、それらの有機溶媒溶液中にゲル分がないもの
を溶剤溶解性に優れていると云つている。このよ
うなゲル分は、例えばキシロース、マンノースな
どの含量の高い多糖類によることが多い。これら
の高重合度のセルロース以外の多糖類を蒸解工程
で除去したのものが溶解パルプであるので、溶解
パルプ中のα−セルロース含量は高く、標準的な
溶解パルプはα−セルロース含量90％以上であ
る。しかしながら、高α−セルロースパルプで
も、上記多糖類を含有するものがあるので高α−
セルロースパルプ（例えば高α−セルロース未晒
パルプ）と溶解パルプとは同義ではない。例えば
α−セルロース含量は比較的低くても、残余のも
のがグルコースの重合物である場合、誘導体の溶
剤溶解性は優れており、本発明に使用することが
できる。
一般に高α−セルロースパルプは、蒸解後、高
度の漂白処理を行うことが多いが、溶解パルプは
パルプをそのままの形状で使用するものではない
ので、漂白処理は高度でなくてよい。本発明の紙
基材原料としても漂白は高度である必要がなく、
むしろ残留塩素が多いと、銀を使用した回路に悪
影響が出るため、漂白は低度のものである方が望
ましい。
溶解パルプはα−セルロース以外の物質の除去
率が高いので、一般の高α−セルロースパルプに
共通した利点は有している。
即ち、含浸性が良好で、打抜き性、電気絶縁性
に優れ、吸湿性の低い積層板を得ることができ
る。一方、同じ高α−セルロースパルプであるリ
ンターパルプの場合、繊維が屈曲しているため、
積層板の寸法安定性が良くないが、木材を原料と
する溶解パルプは積層板としたときの寸法安定性
にも優れている。
即ち、溶解パルプは、木材中に存在するα−セ
ルロース以外の物質を除去しているため多孔質に
なつており、繊維間への樹脂の含浸性が良い。ま
た、ヘミセルロース等が充分除去されているの
で、吸湿性が低く、電気絶縁性ににすぐれた積層
板を得ることができる。更にヘミセルロースが少
なく、樹脂含浸性が良いことは、空隙や繊維間粘
着物質が少なくなり、寸法安定性、打抜加工性の
良いものが得られることにつながる。
ところが溶解パルプから抄紙したものは、製紙
用パルプの場合に比べ強度が低いという欠点があ
り、積層板の度のみならず樹脂含浸時の作業性が
悪いという傾向がある。
〔問題点を解決するための手段〕
この点に対して本発明者等は溶解パルプの叩解
度を15゜SR以上30゜SR以下としてから抄造すると、
充分な強度の紙が得られることを見出し、本発明
を完成するに至つた。
即ち、本発明は、木材パルプを原料とし、これ
を叩解、抄造して積層板原紙を得るにあたつて、
原料木材パルプとして溶解パルプを使用し、これ
を15゜SR以上30゜SR以下の叩解度となるよう叩解
し、次いで抄造することを特徴とする積層板原紙
の製法に関する。
本発明に使用する溶解パルプとは、再生セルロ
ース繊維、セロフアン、セルロースエーテル類、
セルロースエステル類などのセルロース原料とし
て用いられるパルプであり、セルロース純度を高
めるため長時間をかけて蒸解、精製されたパルプ
であつて、製紙用パルプとは区別されている。原
料は主として広葉樹であるが針葉樹パルプもあ
る。蒸解法も主として亜硫酸法が用いられるが硫
酸塩法を使用したものもある。又分析値について
は、例えばビスコース繊維用亜硫酸パルプの品質
が第１表のように定められている（JIS P2701）。
[Industrial Field of Application] The present invention relates to a method for producing base paper for laminated boards used for printed wiring boards, etc., and provides a laminated board with excellent resin impregnation properties, punching workability, dimensional stability, and electrical properties. The present invention relates to a method for producing a paper base material suitable for obtaining. [Prior Art and its Problems] Conventionally, linter paper, kraft paper, linter/kraft mixed paper, etc. have been used as paper base materials for printed wiring boards. In recent years, there has been a demand for electronic components to be smaller and more dense, and requirements for material processing characteristics and electrical properties have become more stringent. However, it is difficult to deal with this problem with conventional paper base materials. That is, when laminates are manufactured using these conventional paper base materials as raw materials, there is a problem in that laminates made from linter paper have good electrical insulation and punching properties, but are poor in dimensional stability. On the other hand, those made from kraft paper have good dimensional stability, but tend to have poor punching workability and poor electrical insulation properties. In addition, mixed paper shows a tendency for the worse characteristics of both components to be emphasized. Furthermore, no inexpensive materials have been developed to replace paper. Since the fibers of paper made from linter pulp are bent, it is not easy to improve the dimensional stability, and the price is higher than paper made from wood pulp. In view of this problem, the present inventor conducted research into a method for obtaining high-performance paper base materials using wood pulp as a raw material. By using dissolving pulp instead of papermaking pulp, the inventors found that dimensional stability and punching properties could be improved by using dissolving pulp instead of papermaking pulp. It was found that a paper base material that can be used as a laminate with excellent physical properties such as processability and electrical properties was obtained. Dissolving pulp is made by reacting this pulp with various chemicals as a raw material.
Its original purpose is to produce cellulose derivatives. The term dissolving pulp comes from the excellent solvent solubility of the above-mentioned cellulose derivatives. Specifically, using pulp,
Cellulose acetate, cellulose nitrate, etc. are said to have excellent solvent solubility if they have no gel content in their organic solvent solutions. Such gel content is often due to high content of polysaccharides such as xylose and mannose. Dissolving pulp is obtained by removing polysaccharides other than cellulose with a high degree of polymerization in the cooking process, so the content of α-cellulose in dissolving pulp is high, and standard dissolving pulp has an α-cellulose content of 90% or more. It is. However, even high α-cellulose pulp contains some of the above-mentioned polysaccharides.
Cellulose pulp (eg high alpha cellulose unbleached pulp) and dissolving pulp are not synonymous. For example, even if the α-cellulose content is relatively low, if the remainder is a glucose polymer, the derivative has excellent solvent solubility and can be used in the present invention. In general, high α-cellulose pulp is often subjected to a high degree of bleaching treatment after cooking, but since the dissolving pulp is not used in its original form, the bleaching treatment does not need to be of a high degree. Bleaching does not need to be highly advanced even as a raw material for the paper base of the present invention.
In fact, if there is a large amount of residual chlorine, it will have an adverse effect on circuits using silver, so it is preferable to bleach to a low degree. Since dissolving pulp has a high removal rate of substances other than α-cellulose, it has an advantage common to general high α-cellulose pulp. That is, it is possible to obtain a laminate with good impregnation properties, excellent punchability and electrical insulation properties, and low hygroscopicity. On the other hand, in the case of linter pulp, which is also a high α-cellulose pulp, the fibers are bent, so
Although the dimensional stability of laminates is not good, dissolving pulp made from wood has excellent dimensional stability when made into laminates. That is, since the dissolving pulp removes substances other than α-cellulose present in the wood, it becomes porous and has good impregnation of resin between the fibers. Furthermore, since hemicellulose and the like are sufficiently removed, a laminate with low hygroscopicity and excellent electrical insulation can be obtained. Furthermore, the low hemicellulose content and good resin impregnation properties lead to fewer voids and interfiber adhesive substances, resulting in a product with good dimensional stability and punching workability. However, paper made from dissolving pulp has the disadvantage that it has lower strength than papermaking pulp, and tends to have poor workability not only in laminated sheets but also in resin impregnation. [Means for solving the problem] In view of this, the present inventors have found that when papermaking is carried out after setting the beating degree of the dissolving pulp to 15°SR or more and 30°SR or less,
It was discovered that paper with sufficient strength could be obtained, and the present invention was completed. That is, the present invention uses wood pulp as a raw material, and in obtaining a laminated board base paper by beating and paper-making it,
This invention relates to a method for producing base paper for laminated boards, which is characterized by using dissolving pulp as a raw material wood pulp, beating it to a degree of beating of 15°SR or more and 30°SR or less, and then making paper. The dissolving pulp used in the present invention includes regenerated cellulose fibers, cellophane, cellulose ethers,
Pulp is used as a raw material for cellulose such as cellulose esters, and is pulp that has been digested and purified over a long period of time to increase the purity of cellulose, and is distinguished from pulp for papermaking. The raw material is mainly hardwood, but softwood pulp is also used. As for the cooking method, the sulfite method is mainly used, but there are also methods that use the sulfate method. Regarding analytical values, for example, the quality of sulfite pulp for viscose fibers is determined as shown in Table 1 (JIS P2701).
以下実施例により本発明を更に説明するが、本
発明はこれに限定されるものではない。
実施例 １
針葉樹材から亜硫酸法で作製した溶解パルプ
（α−セルロース含量96.5％、平均繊維長2.12mm）
を25゜SRまで叩解し（叩解後の平均繊維長1.21
mm）、添加剤なし、スライス濃度0.8％にて、長網
抄紙機を用いて抄造し、原紙を得た。原紙の坪量
は125ｇ／m2、密度は0.48ｇ／cm3であつた。この
原紙にフエノール樹脂（「プライオーフエン
5030」、大日本インキ製を固形分50％になるよう
にイソプロピルアルコールで調製したもの）を含
浸、乾燥して樹脂付着分53％のプリプレグを得
た。このプリプレグを８枚重ね160℃、10Kg／cm2
で10分予圧加熱後、150Kg／cm2で加圧・加熱成形
して厚さ1.6mmの積層板を得た。
原紙および積層板の物性を第２表、第３表に示
す。原紙の含浸性、積層板の打抜加工性、絶縁低
抗、寸法安定性などの諸物性に優れたものであつ
た。
実施例 ２
広葉材から硫酸塩法で作製した溶解パルプ（α
−セルロース含量97.3％、平均繊維長1.38mm）を
22゜SRまで叩解し（叩解後の平均繊維長1.02mm）、
添加剤なし、スライス濃度0.8％にて、長網抄紙
機を用いて抄造し、原紙を得た。原紙の坪量は
126ｇ／m2、密度は0.45ｇ／cm3であつた。この原
紙に実施例１と同様にフエノール樹脂を含浸、乾
燥して樹脂付着分55％のプリプレグを得、８枚積
層して加圧・加熱成形して厚さ1.6mmの積層板を
得た。原紙および積層板の物性を第２表、第３表
に併せて示す。諸物性は実施例１と同様に優れた
ものであつた。
実施例 ３
針葉樹材から亜硫酸法で作製した溶解パルプ
（α−セルロース含量97.2％、平均繊維長2.52mm）
と、広葉樹材から硫酸塩法で作製した溶解パルプ
（α−セルロース含量97.5％、平均繊維長1.62mm）
の等量混合物を23゜SRまで叩解し（叩解後の平均
繊維長1.47mm）、添加剤なし、スライス濃度1.0％
にて長網抄紙機を用いて抄造し原紙を得た。
原紙の坪量は124ｇ／m2、密度は0.47ｇ／cm3で
あつた。この原紙を用いて実施例１、２に準じフ
エノール樹脂を含浸、乾燥し、次いで積層して厚
さ1.6mmの積層板を得た。原紙および積層板の物
性を第２表、第３表に併せて示す。
比較例 １
広葉樹材から硫酸塩法で作製した製紙用パルプ
（α−セルロース含量82.3％、平均繊維長1.27mm）
を25゜SRまで叩解し（叩解後の平均繊維長0.95
mm）、実施例１と同様に抄造し、坪量125ｇ／m2、
密度0.52ｇ／cm3の原紙を得た。
この原紙を用い、実施例１と同様にして積層板
を得たが、第３表に示すとおり、打抜加工性は50
℃以下で極度に低下した。また、絶縁抵抗、耐熱
性についても劣つたものであつた。
比較例 ２
針葉樹材から亜硫酸法で作製した製紙用パルプ
（α−セルロース含量84.3％、平均繊維長2.48mm）
を20゜SRまで叩解し（叩解後の平均繊維長1.42
mm）、実施例１と同様に抄造し、坪量125ｇ／m2、
密度0.53ｇ／cm3の原紙を得た。第２表に示すとお
り、この原紙は含浸性に劣るものであつた。
この原紙を用い、実施例１と同様にして積層板
を得たところ、第３表に示すとおり、打抜加工
性、絶縁抵抗、耐熱性に劣るものであつた。
The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto. Example 1 Dissolving pulp produced from softwood wood by sulfite method (α-cellulose content 96.5%, average fiber length 2.12 mm)
was beaten to 25°SR (average fiber length after beating was 1.21
mm), without additives, at a slice concentration of 0.8%, using a Fourdrinier paper machine to obtain a base paper. The base paper had a basis weight of 125 g/m 2 and a density of 0.48 g/cm 3 . This base paper is coated with phenolic resin
5030, manufactured by Dainippon Ink and prepared with isopropyl alcohol to a solid content of 50%), and dried to obtain a prepreg with a resin adhesion content of 53%. Stack 8 sheets of this prepreg at 160℃, 10Kg/cm 2
After prepressing and heating for 10 minutes, the product was pressurized and heated at 150 kg/cm 2 to obtain a laminate with a thickness of 1.6 mm. The physical properties of the base paper and laminate are shown in Tables 2 and 3. It was excellent in physical properties such as impregnating properties of base paper, punching processability of laminates, low insulation resistance, and dimensional stability. Example 2 Dissolving pulp (α
−Cellulose content 97.3%, average fiber length 1.38mm)
Beaten to 22°SR (average fiber length after beating 1.02mm),
A base paper was obtained by making paper using a Fourdrinier paper machine without any additives and at a slicing concentration of 0.8%. The basis weight of the base paper is
The weight was 126 g/m 2 and the density was 0.45 g/cm 3 . This base paper was impregnated with a phenol resin in the same manner as in Example 1, and dried to obtain a prepreg with a resin adhesion content of 55%. Eight sheets were laminated and molded under pressure and heat to obtain a 1.6 mm thick laminate. The physical properties of the base paper and the laminate are also shown in Tables 2 and 3. The various physical properties were excellent as in Example 1. Example 3 Dissolving pulp produced from softwood wood by sulfite method (α-cellulose content 97.2%, average fiber length 2.52 mm)
and dissolving pulp made from hardwood using the sulfate method (α-cellulose content 97.5%, average fiber length 1.62 mm)
A mixture of equal amounts of was beaten to 23°SR (average fiber length after beating 1.47mm), no additives, slicing concentration 1.0%.
Paper was made using a Fourdrinier paper machine to obtain base paper. The base paper had a basis weight of 124 g/m 2 and a density of 0.47 g/cm 3 . Using this base paper, it was impregnated with a phenolic resin according to Examples 1 and 2, dried, and then laminated to obtain a laminate with a thickness of 1.6 mm. The physical properties of the base paper and the laminate are also shown in Tables 2 and 3. Comparative Example 1 Paper pulp made from hardwood using the sulfate method (α-cellulose content 82.3%, average fiber length 1.27 mm)
is beaten to 25°SR (average fiber length after beating is 0.95
mm), paper-made in the same manner as in Example 1, basis weight 125 g/m 2 ,
A base paper with a density of 0.52 g/cm 3 was obtained. Using this base paper, a laminate was obtained in the same manner as in Example 1, but as shown in Table 3, the punching workability was 50
It decreased extremely below ℃. Furthermore, the insulation resistance and heat resistance were also poor. Comparative Example 2 Paper pulp made from softwood wood by sulfite method (α-cellulose content 84.3%, average fiber length 2.48 mm)
was beaten to 20°SR (average fiber length after beating was 1.42
mm), paper-made in the same manner as in Example 1, basis weight 125 g/m 2 ,
A base paper with a density of 0.53 g/cm 3 was obtained. As shown in Table 2, this base paper had poor impregnation properties. When a laminate was obtained using this base paper in the same manner as in Example 1, as shown in Table 3, it was inferior in punching workability, insulation resistance, and heat resistance.
【表】
マシ油が試料の全面に浸透するのに要した時
間。
[Table] Time required for mustard oil to penetrate the entire surface of the sample.
【表】
実施例 ４、５
針葉樹材から亜硫酸法で製造した溶解パルプ
（α−セルロース含量97.2％、平均繊維長2.52mm）
と広葉樹材から硫酸塩法で製造した溶解パルプ
（α−セルロース含量97.5％、平均繊維長1.62mm）
を90／10及び80／20に混合してそれぞれ23゜SRま
で叩解し、添加剤なし、スライス濃度0.7％にて
長網抄紙機を用いて抄造し、原紙を得た。このも
のは、針葉樹材をそれぞれ別々に叩解した後、
90／10、80／20に混合して叩解度23゜SRに調製し
たものより吸水度が高く、油浸透度の低い含浸性
の良いものであつた。
この原紙を用いて実施例１に準じフエノール樹
脂を含浸、乾燥し、次いで積層して厚さ1.6mmの
積層板を得た。原紙および積層板の物性を第４
表、第５表に併せて示す。諸物性は実施例１と同
様に優れたものであつた。
尚、第４表の＊１、＊２は第２表の註に、第５
表の＊１〜＊５は第３表の註に準ずる。[Table] Examples 4 and 5 Dissolving pulp produced from softwood wood by the sulfite method (α-cellulose content 97.2%, average fiber length 2.52 mm)
Dissolving pulp produced from hardwood and hardwood using the sulfate method (α-cellulose content 97.5%, average fiber length 1.62 mm)
A mixture of 90/10 and 80/20 was beaten to 23°SR, and paper was made using a Fourdrinier paper machine without additives and at a slicing concentration of 0.7% to obtain base paper. This material is made by beating each piece of coniferous wood separately.
The water absorption was higher than that prepared by mixing 90/10 and 80/20 to give a freeness of 23°SR, and the oil had a low oil permeability and good impregnating properties. Using this base paper, it was impregnated with a phenolic resin in the same manner as in Example 1, dried, and then laminated to obtain a laminate with a thickness of 1.6 mm. Physical properties of base paper and laminate
It is also shown in Table 5. The various physical properties were excellent as in Example 1. Note that *1 and *2 in Table 4 are in the notes of Table 2, and
*1 to *5 in the table follow the notes in Table 3.
【表】【table】
Claims (1)
て積層板原紙を得るにあたつて、原料木材パルプ
として溶解パルプを使用し、これを15゜SR以上
30゜SR以下の叩解度となるよう叩解し、次いで抄
造することを特徴とする積層板原紙の製法。 ２ 原料木材パルプの少なくとも50％が針葉樹溶
解パルプである特許請求の範囲第１項記載の積層
板原紙の製法。[Scope of Claims] 1. When wood pulp is used as a raw material and is beaten and made into paper to obtain laminated board base paper, dissolving pulp is used as the raw material wood pulp, and this is made into a material with a SR of 15° or more.
A method for producing base paper for laminated board, which is characterized by beating the paper to a degree of beating of 30°SR or less, and then papermaking. 2. The method for manufacturing laminated board base paper according to claim 1, wherein at least 50% of the raw material wood pulp is softwood dissolving pulp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640286A JPS62263396A (en) | 1986-05-09 | 1986-05-09 | Production of laminated board base paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10640286A JPS62263396A (en) | 1986-05-09 | 1986-05-09 | Production of laminated board base paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62263396A JPS62263396A (en) | 1987-11-16 |
| JPH0227472B2 true JPH0227472B2 (en) | 1990-06-18 |
Family
ID=14432691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10640286A Granted JPS62263396A (en) | 1986-05-09 | 1986-05-09 | Production of laminated board base paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62263396A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5711291A (en) * | 1980-06-17 | 1982-01-20 | Sanyo Kokusaku Pulp Co | Production of soluble pulp from heneken fiber |
| JPS6079952A (en) * | 1983-10-07 | 1985-05-07 | 山陽国策パルプ株式会社 | Manufacture of laminated board |
-
1986
- 1986-05-09 JP JP10640286A patent/JPS62263396A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5711291A (en) * | 1980-06-17 | 1982-01-20 | Sanyo Kokusaku Pulp Co | Production of soluble pulp from heneken fiber |
| JPS6079952A (en) * | 1983-10-07 | 1985-05-07 | 山陽国策パルプ株式会社 | Manufacture of laminated board |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62263396A (en) | 1987-11-16 |
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