JPS6355731A - Production of magnetic disk substrate - Google Patents
Production of magnetic disk substrateInfo
- Publication number
- JPS6355731A JPS6355731A JP20060286A JP20060286A JPS6355731A JP S6355731 A JPS6355731 A JP S6355731A JP 20060286 A JP20060286 A JP 20060286A JP 20060286 A JP20060286 A JP 20060286A JP S6355731 A JPS6355731 A JP S6355731A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- core material
- magnetic disk
- sheet
- reinforcing material
- 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.)
- Pending
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 44
- 239000012779 reinforcing material Substances 0.000 claims abstract description 26
- 239000011162 core material Substances 0.000 claims abstract description 19
- 239000004734 Polyphenylene sulfide Substances 0.000 claims abstract description 18
- 229920000069 polyphenylene sulfide Polymers 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000000696 magnetic material Substances 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000012792 core layer Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920006038 crystalline resin Polymers 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
［技術分野］
本発明は、コンピュータメモリディスク用などに用いら
れる磁気ディスク基板の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing a magnetic disk substrate used for computer memory disks and the like.
［背景技術］
磁気ディスク基板は現在コンピュータメモリディスク用
として主に使用されている。この磁気ディスク基板とし
ては、Ａ１合金をベースしてディスク状に加工したのち
に表面を鏡面加工し、これに磁気材をコーティング処理
してさらに鏡面仕上げをおこなうことによって製造され
るものが現在の主流である。しかしこのＡ１合金をベー
スにするものでは生産性やコストのうえで問題があり、
磁気ディスク基板を金属から樹脂へと移行させて生産性
を向上させると共に低コストで生産できるようにするこ
とが検討されている。[Background Art] Magnetic disk substrates are currently mainly used for computer memory disks. The current mainstream type of magnetic disk substrate is one that is manufactured by processing A1 alloy into a disk shape, then mirror-finishing the surface, and then coating it with a magnetic material and further mirror-finishing it. It is. However, products based on this A1 alloy have problems in terms of productivity and cost.
Consideration has been given to changing magnetic disk substrates from metal to resin to improve productivity and enable lower cost production.
しかし樹脂で磁気ディスク基板を製造することは未だ実
用化されていないものであり、その理由として次のこと
が指摘されている。However, manufacturing magnetic disk substrates using resin has not yet been put to practical use, and the following reasons have been pointed out as reasons for this.
■ 樹脂基板では表面平滑性を与えにくい。■ It is difficult to provide surface smoothness with resin substrates.
■ 磁気材をコーティングする際に２００°Ｃ程度の温
度で加熱がなされるが、この温度に酎える樹脂が少ない
。■ When coating magnetic materials, heating is done at a temperature of about 200°C, but there is little resin that can reach this temperature.
■ 強度と寸法安定性をあわせ持ち、磁性材との熱影響
によるクラック発生などに対して満足できる樹脂が少な
い。■ There are few resins that have both strength and dimensional stability, and are satisfactory in preventing cracks from occurring due to thermal effects with magnetic materials.
■ 生産性が良い、例えば押出し成形や射出成形などに
対応することができる量産向きの樹肥で、上記■〜■を
満足する樹脂はさらに少ない。■ There are even fewer resins that are highly productive and suitable for mass production, such as those that can be used in extrusion molding and injection molding, and that satisfy the above requirements (■) to (■).
すなわち、■を満足するためには熱硬化性樹脂を用いる
ことはできず、熱可塑性樹脂を用いる必要があり、熱可
塑性υ（脂を用いる場合において■■を満足させるには
ある程度の繊維質材料やフィラーなど補強材を含有した
熱可塑性のエンジニアリングプラスチックを用いること
が考えられるが、補強材を含有させると■の表面平滑性
が与えられなくなるのである。ちなみに本発明者等は従
前に、エンジニアリングプラスチックに分類されるガラ
スｆｉ、４Ｉ４０％入りのポリフェニレンサルファイド
樹、脂（以下ＰＰＳ樹脂と略称）を射出成形して磁気デ
ィスク基板を製造する検討をおこなったが、ガラス＃＆
維が表面に表れて表面粗さの最大限ＲｔＢａｘを０．１
μ以下にすることは到底不可能であり、■を満足できず
実用化することはできなかった。In other words, in order to satisfy ■, it is not possible to use a thermosetting resin, it is necessary to use a thermoplastic resin, and thermoplastic υ (when using fat, a certain amount of fibrous material is required to satisfy ■■). It is conceivable to use thermoplastic engineering plastics containing reinforcing materials such as or fillers, but if reinforcing materials are included, the surface smoothness described in (■) cannot be achieved.Incidentally, the present inventors have previously We investigated manufacturing magnetic disk substrates by injection molding polyphenylene sulfide resin (hereinafter abbreviated as PPS resin) containing 40% glass fi and 4I, which are classified as glass #&
fibers appear on the surface and the maximum surface roughness RtBax is 0.1
It is absolutely impossible to make it less than μ, and it was not possible to put it into practical use because the condition (2) could not be satisfied.
また二〇Ｐ Ｐ Ｓ樹脂においてプラス繊維など補強材
を含まないものでは表面平滑性が良好で■を満足するこ
とができるが、低強度で耐熱性が低く、寸法安定性や耐
クラックなどに問題があり、■■を満足することはでき
ない。In addition, 20PPS resins that do not contain reinforcing materials such as plus fibers have good surface smoothness and can satisfy (■), but have low strength and heat resistance, and have problems with dimensional stability and crack resistance. Therefore, ■■ cannot be satisfied.
［発明の目的］
本発明は、上記の点に鑑みて為されたものであり、樹脂
によって製造することができる磁気ディスク基板の製造
方法を提供することを目的とするものである。[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a magnetic disk substrate that can be manufactured using resin.
［発明の開示］
しかして本発明に係る磁気ディスク基板の製造方法は、
補強材入りのＰＰＳ樹脂で形ｒ＆される芯材１の両面に
、補強材を含有しないＰ Ｐ Ｓ ａ（脂で形成される
樹脂シート２を重ね、これを一体化成形したのちにディ
スク状に打ち抜き加工すること特徴とするものであり、
押出し成形などが可能な熱可塑性のＰＰＳ樹脂を用いる
ことで前た■を満足させ、芯材１を補強材入りのＰＰＳ
樹甜で形成して前記■■を満足させると共に表面の層と
なる８（脂シート２を補強材を含有しないＰＰＳ樹脂で
形成して前記■を満足させるようにし、もって樹脂によ
って製造することを可能にしたものであって以下本発明
を実施例により詳述する。[Disclosure of the Invention] However, the method for manufacturing a magnetic disk substrate according to the present invention includes:
A core material 1 formed of PPS resin containing a reinforcing material is overlaid with a PPS resin sheet 2 made of resin that does not contain a reinforcing material on both sides, and after integrally molding these sheets, a disc-shaped It is characterized by punching,
By using a thermoplastic PPS resin that can be extruded, we satisfied the previous point (2), and the core material 1 was made of PPS containing reinforcing material.
8 (The resin sheet 2 is made of PPS resin that does not contain a reinforcing material to satisfy the above (2), thereby satisfying the above (2)). This invention has been made possible, and the present invention will be described in detail below with reference to Examples.
ＰＰＳ樹脂はベンゼン環と硫黄とが交互結合された構造
を有するもので、高流動性の結晶性樹脂であり、次の特
徴を有する。PPS resin has a structure in which benzene rings and sulfur are alternately bonded, is a highly fluid crystalline resin, and has the following characteristics.
１）ガラス転位温度（Ｔｇ）が２８０ ’Ｃで、耐熱性
が優れている。1) Excellent heat resistance with glass transition temperature (Tg) of 280'C.
２）寸法安定性が優れている。この寸法安定性は長期的
にも良好である。2) Excellent dimensional stability. This dimensional stability is also good over the long term.
３）吸水率が小さい。3) Low water absorption rate.
４）押出し成形や射出成形が可能である。4) Extrusion molding and injection molding are possible.
そしてこのＰ Ｐ Ｓ ｌ（脂には補強材を容易に混合
することができる。補強材としてはガラス繊維や炭素Ｉ
！ｌ＆維、ウィスカーなどの繊維質補強材や無機質フィ
ラーを用いることができ、これらの一方あるいは両者を
併用することができる。A reinforcing material can be easily mixed with this P P S l (fat). Glass fiber or carbon I can be used as a reinforcing material.
! A fibrous reinforcing material such as l&fiber and whiskers or an inorganic filler can be used, and one or both of these can be used in combination.
しかして本発明においては、磁気ディスク基板Ａを芯層
ａと表面層すとの積層、構造でｖＩ造するようにするも
のであり、芯層ａ′＋構成する芯材１を補強材入りのＰ
ＰＳ樹脂で形成し、表面層すを構成するａ（脂シート２
を補強材を含有しない生のＰＰ３４３１脂で形成するよ
うにしたものである。すなわち、まず第２図（ａ）のよ
うに押出し成形装置の金型５から強化材入りのＰ Ｐ
Ｓ ａ（脂を芯材１としてシート状に連続して押出し成
形すると共に（第１図のＣ工程）、この芯材１の上下両
面に補強材を含有しないＰ Ｐ Ｓ ａｔ脂でフィルム
状に形成した長尺の樹脂シート２．２をフィル６．６が
ら繰り出して重ねる（！６１図のｂ工程）。このとき補
助ロール７を用いて樹脂シート２，２をプイドしつつ芯
材１の押出し速度に同調させて芯材１に重ねるようにす
る。次に芯＃１にａｔ脂レシート２２を重ねた状態でヒ
ータなどの加熱装置８で加熱しく第１図のＣ工程）、こ
ののちに第２図（ｂ）のように表面を鏡面仕上げした加
圧ロールなどで形成される加圧装置４に導入して加圧す
ることよって、芯材１に樹脂シート２を熱圧着させて積
層一体化させる（第１図のＣ工程）。このようにして補
強材入りＰ Ｐ Ｓ ４７５脂の芯材」による芯層ａの
両面に補強材を含有しない生Ｐ Ｐ Ｓ Ｐｉ（脂のａ
４脂シート２による表面層すを積層した基板シート９を
得ることができる。次にこの長尺に成形されることにな
る基板シート９を打ち抜き装置１０に導き、基板シート
９からディスク形状のものを打ち抜いて（第１図のｅ工
程）、第３図に示すような磁気ディスク基＠Ａを得る（
第１図のｆ工程）。ここで、打ち抜き装置１０は例えば
第２図（ｅ）のように基台１１に油圧機構などで上下昇
降部ｒＢＪされる可動台１２を取り付けたプレス装置で
形成されるものであり、基台１１には内形孔１３と外形
孔１４とを有する打ち抜きグイ１５が取り付けてあり、
また可動台１２には内形抜きポンチ１６と外形抜きポン
チ１７とが取り付けである。そしてまず内形抜きポンチ
１６と内形孔１３との間で内形な抜き、次いで外形抜き
ポンチ１７と外形孔１４との開で外形を抜くことによっ
てディスク形状に打ち抜くことができる。However, in the present invention, the magnetic disk substrate A is constructed with a laminated structure of a core layer a and a surface layer. P
A (fat sheet 2) is made of PS resin and constitutes the surface layer.
is made of raw PP3431 resin containing no reinforcing material. That is, as shown in FIG. 2(a), P P containing reinforcing material is first removed from the mold 5 of the extrusion molding device.
S a (fat is used as the core material 1 and is continuously extruded into a sheet shape (Step C in Figure 1), and the top and bottom surfaces of this core material 1 are formed into a film shape with P P S at fat that does not contain any reinforcing material. The formed long resin sheets 2.2 are fed out together with the fill 6.6 and overlapped (step b in Figure 61). At this time, the core material 1 is extruded while the resin sheets 2, 2 are pulled using the auxiliary roll 7. Synchronize the speed and overlap it with the core material 1. Next, with the AT resin receipt 22 overlapped on the core #1, heat it with a heating device 8 such as a heater (Step C in Fig. 1). As shown in Fig. 2(b), the resin sheet 2 is thermocompression bonded to the core material 1 and integrated by lamination by introducing it into a pressure device 4 formed by a pressure roll or the like with a mirror-finished surface and applying pressure. (Step C in Figure 1). In this way, raw P P S Pi (fat a
It is possible to obtain a substrate sheet 9 on which a surface layer of the 4-fat sheet 2 is laminated. Next, the substrate sheet 9, which is to be formed into a long length, is guided to a punching device 10, and a disc-shaped piece is punched out from the substrate sheet 9 (step e in FIG. 1), and a magnetic material as shown in FIG. Get disk base @A (
Step f in Figure 1). Here, the punching device 10 is formed by a press device, for example, as shown in FIG. A punched gouer 15 having an inner hole 13 and an outer hole 14 is attached to the hole.
Further, an inner punch 16 and an outer punch 17 are attached to the movable table 12. Then, first, the inner shape is punched out between the inner shape punch 16 and the inner shape hole 13, and then the outer shape is punched out between the outer shape punch 17 and the outer shape hole 14, thereby making it possible to punch out a disk shape.
このようにして得られる磁気ディスク基板Ａは、芯層ａ
が補強材入りのＰ Ｐ Ｓ ？ｊｆ脂であるために、補
強材によってＰＰＳ樹脂の耐熱性を向上させると共にま
た強度や寸法安定性を向上させ、さらには耐クラツク性
を向上させることができ、前記した■や■を満足させる
ことができるものであり、また表面層すが補強材を含有
しない生のＰ Ｐ ６８！脂であるために、補強材の影
響なく表面平滑性を与えることができ、前記■を満足さ
せることができる。従って、■を満足する熱可塑性樹脂
であるＰ Ｐ Ｓ ａ＋脂を用いて磁気ディスク基板Ａ
を低コストで量産して製造することが可能になるのであ
る。The magnetic disk substrate A obtained in this way has a core layer a
Is it P P S with reinforcing material? Since it is a JF resin, the reinforcing material can improve the heat resistance of the PPS resin, as well as improve the strength and dimensional stability, as well as improve the crack resistance, and satisfy the above-mentioned conditions (1) and (2). It is a raw P P 68! that can be made of raw P P 68! whose surface layer does not contain any reinforcing material. Since it is a fat, surface smoothness can be imparted without the influence of reinforcing materials, and the above condition (2) can be satisfied. Therefore, the magnetic disk substrate A is made using P P S a+ resin, which is a thermoplastic resin that satisfies (■).
This makes it possible to mass-produce at low cost.
尚、上記実施例では表面平滑性を向上させるために第２
図（ｂ）に示すように、加圧装置４として鏡面ロールを
用いるようにしているが、さらに表面平滑性を向上させ
るためにこの鏡面ロールを複数個用いたり、磨きロール
を付加したりすることができる。また、磁気ディスク基
板Ａの表面には磁気材がコーティングして設けられるが
、第２図（ｂ）のように芯材１に樹脂シート２．２を一
体化して長尺の基板シート９を作成したのちに、この基
板シート９を再度加熱して磁気材をコーティングするこ
とができる。このように長尺の基板シート９に磁気材を
コーティングするようにすることによって、磁気材コー
ティングを磁気ディスク基板Ａの製造のラインの一部に
組み込むことができることになる。In addition, in the above embodiment, the second
As shown in Figure (b), a mirror roll is used as the pressure device 4, but in order to further improve the surface smoothness, it is possible to use a plurality of mirror rolls or add a polishing roll. Can be done. Further, the surface of the magnetic disk substrate A is coated with a magnetic material, and as shown in FIG. 2(b), a long substrate sheet 9 is created by integrating a resin sheet 2.2 with the core material 1. Afterwards, this substrate sheet 9 can be heated again and coated with magnetic material. By coating the long substrate sheet 9 with the magnetic material in this manner, the magnetic material coating can be incorporated into a part of the production line for the magnetic disk substrate A.
［発明の効果］
上述のように本発明にあっては、補強材入りのＰＰＳ樹
脂で形成される芯材の両面に、補強材を含有しないＰＰ
Ｓ樹脂で形成される樹脂シートを重ね、これを一体化成
形したのちにディスク状に打ち抜き加工するようにした
ので、芯層を形成する芯材は補強材によって耐熱性や強
度、寸法安定性、耐クラック性等に優れ、しかも表面層
を形成する樹脂シートは補強材の影響なく表面平滑性を
与えることができ、成形が容易な熱可塑性樹脂であるＰ
ＰＳ樹脂を用いて磁気ディスク基板を製造することが可
能になるものである。[Effects of the Invention] As described above, in the present invention, a core material made of PPS resin containing a reinforcing material is coated with PP containing no reinforcing material on both sides of the core material.
Resin sheets made of S resin are stacked, integrally molded, and then punched into a disk shape.The core material that forms the core layer has heat resistance, strength, dimensional stability, and P is a thermoplastic resin that has excellent crack resistance, etc., and the resin sheet that forms the surface layer can provide surface smoothness without the influence of reinforcing materials, and is easy to mold.
This makes it possible to manufacture magnetic disk substrates using PS resin.
第１図は本発明の−Ｘ−実施例の工程の７０−チャート
、第２図（ａ）（ｂ）（ｃ）は同上の各工程での断面図
、ｆｊＩＪ３図（ａ）（ｂ）は同上によつ、て得られる
磁気ディスク基板の平面図と断面図である。
１は芯材、２は樹脂シートである。Figure 1 is a 70-chart of the process of -X- Example of the present invention, Figures 2 (a), (b), and (c) are cross-sectional views at each of the above steps, and fjIJ3 figures (a) and (b) are FIG. 3 is a plan view and a sectional view of a magnetic disk substrate obtained by the same method as above. 1 is a core material, and 2 is a resin sheet.
Claims (1)
形成される芯材の両面に、補強材を含有しないポリフェ
ニレンサルファイド樹脂で形成される樹脂シートを重ね
、これを一体化成形したのちにディスク状に打ち抜き加
工することを特徴とする磁気ディスク基板の製造方法。(1) A resin sheet made of polyphenylene sulfide resin that does not contain reinforcing material is layered on both sides of a core material made of polyphenylene sulfide resin that contains reinforcing material, and after integrally molding these, they are punched into a disk shape. A method for manufacturing a magnetic disk substrate, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20060286A JPS6355731A (en) | 1986-08-26 | 1986-08-26 | Production of magnetic disk substrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20060286A JPS6355731A (en) | 1986-08-26 | 1986-08-26 | Production of magnetic disk substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6355731A true JPS6355731A (en) | 1988-03-10 |
Family
ID=16427090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20060286A Pending JPS6355731A (en) | 1986-08-26 | 1986-08-26 | Production of magnetic disk substrate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6355731A (en) |
-
1986
- 1986-08-26 JP JP20060286A patent/JPS6355731A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4744846A (en) | Method of shaping resin laminate sheet | |
| CN205046418U (en) | Reinforcing element of light structure and be used for making materials compound thing of this reinforcing element | |
| KR940011167A (en) | Method for producing a metal-polypropylene-metal laminate and a molded sheet material of the laminate | |
| US4859524A (en) | Reinforced composite and method of manufacture | |
| CN101885252A (en) | Be used to the insertion injection moulding method that inserts injection molding film and use this film | |
| JPWO2019188195A1 (en) | Manufacturing method of fiber reinforced plastic | |
| CN109532058A (en) | A kind of Varying-thickness polymer matrix composites structure preparation method | |
| JPH08136755A (en) | Manufacture of optical waveguide from laminate | |
| JPS6355731A (en) | Production of magnetic disk substrate | |
| CN104626615B (en) | The manufacture method of material shell | |
| CN110520282A (en) | A kind of method being manufactured product and the moulded products thus manufactured | |
| CN103442888A (en) | Composite material and method for preparing the same | |
| JP2006525889A (en) | Manufacturing method of aspherical hybrid lens | |
| CN1069537A (en) | High-strength polytetrafluoroethyl-ne welding Compound Fabric, manufacturing, application | |
| US20230405973A1 (en) | Composite material structure and manufacturing method thereof | |
| CN213321823U (en) | Composite material structure suitable for net size forming in die pressing process | |
| CN2110571U (en) | High-strength polytetrafluorethylene welding composite cloth | |
| KR980005234A (en) | Method for manufacturing film type deflection member of cathode ray tube and its deflection member | |
| JPS58112739A (en) | Manufacture of projecting screen | |
| JPS606455A (en) | Paperboard hot-pressed shape with skin and manufacture thereof | |
| KR980005235A (en) | Method for manufacturing film type deflection member of cathode ray tube and its deflection member | |
| JP3309913B2 (en) | Method for producing thermoplastic composite material | |
| JPS6094304A (en) | Manufacture of flitch | |
| CN113752665A (en) | High-transparency self-adhesive film and processing method thereof | |
| JPS63278843A (en) | Preparation of molding material |