JPS647430B2 - - Google Patents
Info
- Publication number
- JPS647430B2 JPS647430B2 JP10163081A JP10163081A JPS647430B2 JP S647430 B2 JPS647430 B2 JP S647430B2 JP 10163081 A JP10163081 A JP 10163081A JP 10163081 A JP10163081 A JP 10163081A JP S647430 B2 JPS647430 B2 JP S647430B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- polyethylene
- present
- tetrafluoroethylene
- ptfe
- 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
Links
- 229920000642 polymer Polymers 0.000 claims description 13
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 229920005672 polyolefin resin Polymers 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000012778 molding material Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- PYVHTIWHNXTVPF-UHFFFAOYSA-N F.F.F.F.C=C Chemical compound F.F.F.F.C=C PYVHTIWHNXTVPF-UHFFFAOYSA-N 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229920000573 polyethylene Polymers 0.000 description 9
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 8
- -1 polyethylene Polymers 0.000 description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 8
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000019506 cigar Nutrition 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08757—Guiding means
- G11B23/08764—Liner sheets
Description
【発明の詳細な説明】
本発明はカセツト磁気録音用テープに内蔵され
る滑りシートに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding sheet incorporated in a cassette magnetic recording tape.
一般にカセツトテープにおいて、ケースとリー
ルテープとの間には、摩擦抵抗を感じ、かつテー
プの走行を滑らかにするために、滑りシートとし
て種々の材料からなるシート部材が用いられてい
る。代表的な例として導電性カーボン入り超高分
子量ポリエチレンシート、導電性カーボン入り４
フツ化エチレン重合物シート、シリコンを含浸し
たカーボン入り特殊紙シート等が知られている。
上述の滑りシートはいずれも次に挙げる何等かの
欠点を有しており、従つて性能、加工性及び価格
の全てを満足するすぐれたシート材の開発が望ま
れていた。 Generally, in a cassette tape, a sheet member made of various materials is used as a sliding sheet between the case and the reel tape in order to feel frictional resistance and to make the tape run smoothly. Typical examples include conductive carbon-containing ultra-high molecular weight polyethylene sheet, conductive carbon-containing 4
Fluorinated ethylene polymer sheets, carbon-containing special paper sheets impregnated with silicone, etc. are known.
All of the above-mentioned sliding sheets have some of the following drawbacks, and therefore, it has been desired to develop an excellent sheet material that satisfies all of the requirements of performance, workability, and cost.
すなわち、導電性カーボン入り４フツ化エチレ
ン重合物シートは柔難なため、取り扱い時にシー
ト端面の曲り込み、折れ、破れ等が発生し、また
加熱によつてシートが葉巻状にカールし、耐熱
性、形状安定性に欠け、また融点が320℃以上と
高く高温時の流動性に欠けるため、加工方法が一
般に用いられる成膜法に比べ特殊な機械・方法を
用いなければならない、従つて原料コストに加え
て加工コストが高いという欠点を有している。ま
た導電性カーボン入り超高分子量ポリエチレンは
上述の４フツ化エチレン重合物の欠点を改良し、
特に導電性カーボン入り４フツ化エチレン重合物
シートの柔軟さと原料コスト面を改良するものと
して市販されたが完全ではなく、４フツ化エチレ
ン重合物と同様、高温時の流動性に欠けるため、
特殊な加工方法によらねばならない。すなわち、
超高分子量ポリエチレン粉末とカーボン粉末を加
熱加圧成型しブロツク状としてから、所望の厚み
のフイルムに切削しなければならず生産効率が低
く、加工コストが高い。また剛性が極めて大きい
ので剪断強度が極めて大きく所定形状に打抜き加
工する際に打抜刃を摩耗させたり、打抜製品にバ
リが生じる等の欠点がある。またシリコンを含浸
したカーボンを含む特殊紙シートは、コストが低
いという長所をもつ反面、性能が劣り、特に、表
面滑性、耐摩耗性、あるいは滑性効果のための突
起を有する場合は弾力性が劣るという欠点があ
る。 In other words, since the conductive carbon-containing tetrafluoroethylene polymer sheet is flexible, the sheet edges may bend, fold, or tear when handled, and the sheet may curl into a cigar shape when heated, resulting in poor heat resistance. , lacks shape stability, and has a high melting point of 320°C or higher and lacks fluidity at high temperatures, so the processing method requires the use of special machines and methods compared to commonly used film-forming methods, resulting in lower raw material costs. In addition, it has the disadvantage of high processing cost. In addition, ultra-high molecular weight polyethylene containing conductive carbon improves the drawbacks of the above-mentioned tetrafluoroethylene polymer,
In particular, it was commercially available to improve the flexibility and raw material cost of conductive carbon-filled tetrafluoroethylene polymer sheets, but it is not perfect, and like tetrafluoroethylene polymers, it lacks fluidity at high temperatures.
Special processing methods must be used. That is,
Ultra-high molecular weight polyethylene powder and carbon powder must be molded under heat and pressure to form a block and then cut into a film of desired thickness, resulting in low production efficiency and high processing costs. In addition, since the rigidity is extremely high, the shear strength is extremely large, and there are disadvantages such as abrasion of the punching blade when punching into a predetermined shape and burrs on the punched product. Also, special paper sheets containing carbon impregnated with silicone have the advantage of low cost, but have poor performance, especially when they have protrusions for surface smoothness, abrasion resistance, or lubricity effects. The disadvantage is that it is inferior.
本発明者は叙上の欠点を解消すべく研究の結
果、ポリオレフイン系樹脂にカーボンブラツク２
〜30重量％、４フツ化エチレン重合物もしくは４
フツ化エチレン−６フツ化プロピレン共重合物も
しくはそれらの混合物２〜50重量％を混合した成
形材料を成形してなるシートにより、カセツトテ
ープ用滑りシートを構成すれば従来の４フツ化エ
チレン重合物シート、超高分子量ポリエチレンの
シートなどからなるものに比べ、加工性、生産性
が向上し、コストを低減できることを見い出し、
かかる知見にもとづいて本発明を完成したもので
ある。 As a result of research in order to eliminate the above-mentioned drawbacks, the inventors of the present invention have added carbon black 2 to polyolefin resin.
~30% by weight, tetrafluoroethylene polymer or 4
If a sliding sheet for a cassette tape is formed by molding a molding material containing fluorinated ethylene-hexafluorinated propylene copolymer or a mixture thereof from 2 to 50% by weight, it can be used as a conventional tetrafluorinated ethylene polymer. We discovered that compared to sheets made of ultra-high molecular weight polyethylene sheets, processability and productivity are improved, and costs can be reduced.
The present invention was completed based on this knowledge.
即ち、本発明の要旨はポリオレフイン系樹脂に
カーボンブラツク２〜30重量％、４フツ化エチレ
ン重合物もしくは４フツ化エチレン−６フツ化プ
ロピレン共重合物もしくは４フツ化エチレン重合
物と４フツ化エチレン−６フツ化プロピレン共重
合物の混合物２〜50重量％を混合した成形材料を
成形してなるシートからなることを特徴とするカ
セツトテープ用滑りシートである。 That is, the gist of the present invention is to add 2 to 30% by weight of carbon black to a polyolefin resin, a tetrafluoroethylene polymer, a tetrafluoroethylene-hexafluoropropylene copolymer, or a tetrafluoroethylene polymer and a tetrafluoroethylene polymer. A sliding sheet for a cassette tape, characterized in that it is a sheet formed by molding a molding material containing 2 to 50% by weight of a hexafluorinated propylene copolymer.
以下、本発明につき、詳細に説明する。 Hereinafter, the present invention will be explained in detail.
本発明のカセツトテープ用滑りシートはポリオ
レフイン系樹脂にカーボンブラツク２〜30重量
％、４フツ化エチレン重合物（以下PTFEとい
う）もしくは４フツ化エチレン−６フツ化プロピ
レン共重合物（以下FEPという）もしくはPTFE
とFEP混合物を混合した成形材料を成形したシ
ートからなる。 The sliding sheet for cassette tapes of the present invention is a polyolefin resin containing 2 to 30% by weight of carbon black and a tetrafluoroethylene polymer (hereinafter referred to as PTFE) or a tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP). Or PTFE
It consists of a sheet molded from a molding material mixed with FEP mixture and FEP mixture.
第１図及び第２図は本発明のカセツトテープ用
滑りシート１を示し、２は突起部である。 1 and 2 show a sliding sheet 1 for a cassette tape according to the present invention, and 2 is a protrusion.
ポリオレフイン系樹脂として、押出成形用のポ
リエチレンで、メルトインデツクスが、0.01〜
10.0ｇ／10分程度で好ましくは0.05〜5.0ｇ／10
分、密度が、0.940以上の高密度ポリエチレンが
良く、この材料は、適度な剛度、耐衝撃性を有
し、かつ、従来の超高分子量ポリエチレンや４フ
ツ化エチレン重合物に比べ、加工適性にすぐれ、
汎用のポリエチレンフイルムを成膜する時に使用
するＴダイ押出機やインフレーシヨン押出機を利
用して成膜できる。またポリエチレンの代りにポ
リオレフイン系樹脂としてポリエチレン−酢酸ビ
ニル共重合体、ポリエチレン−エチルアクリレー
ト共重合体、ポリプロピレン、ポリエチレンに
種々の添加剤、たとえば酸化防止剤、滑剤、ブロ
ツキング防止剤、帯電防止剤、充填剤等を含む樹
脂、アイオノマー樹脂等の押出し成型可能な樹脂
を利用することもできる。 As polyolefin resin, polyethylene for extrusion molding has a melt index of 0.01~
About 10.0g/10 minutes, preferably 0.05 to 5.0g/10
High-density polyethylene with a density of 0.940 or more is preferred. This material has appropriate stiffness and impact resistance, and has better processability than conventional ultra-high molecular weight polyethylene or tetrafluoroethylene polymers. Excellent,
The film can be formed using a T-die extruder or an inflation extruder that is used to form a general-purpose polyethylene film. In addition, polyethylene-vinyl acetate copolymer, polyethylene-ethyl acrylate copolymer, polypropylene, polyethylene and various additives such as antioxidants, lubricants, antiblocking agents, antistatic agents, and fillers can be used as polyolefin resins instead of polyethylene. It is also possible to use extrusion moldable resins such as resins containing agents and ionomer resins.
ポリオレフイン系樹脂に混合するカーボンブラ
ツクとしては、導電性カーボンブラツクの粉末、
すなわち粒子径が10〜60nｍ、吸油量が100〜400
c.c.／100ｇで、アセチレンの熱分解法又は、重油
の不完全燃焼法により生産され、ケツチエンブラ
ツク、アセチレンブラツク、フアーネスブラツク
等の名称で市販されているものまたPTFEとして
は、添加剤用の粉末を用い、好ましくは粒径が
10μ以下のものを用いる。 Carbon black to be mixed with polyolefin resin includes conductive carbon black powder,
In other words, the particle size is 10 to 60 nm and the oil absorption is 100 to 400.
cc/100g, produced by the thermal decomposition method of acetylene or the incomplete combustion method of heavy oil, and is commercially available under the names of Kettien Black, Acetylene Black, Furnace Black, etc. Also, as PTFE, it is used as an additive. Use a powder, preferably with a particle size of
Use one with a diameter of 10μ or less.
本発明においてカーボンブラツクとPTFEの組
成率は、カーボンブラツクが２〜30重量％で、シ
ートに成形した場合に表面抵抗値が102〜1012Ω
の範囲に入ることが好ましく、２％以下だと1012
Ω以上となり、帯電防止性能が劣り30％以上だと
ポリエチレンの高温時の流動性が低下し、成膜加
工が困難となる。またPTFE及び／又はFEPの添
加量は２〜50重量％で、シートに成形した場合に
摩擦係数が0.15以下になることが好ましい。 In the present invention, the composition ratio of carbon black and PTFE is 2 to 30% by weight, and the surface resistance value when formed into a sheet is 10 2 to 10 12 Ω.
It is preferable that it falls within the range of 10 to 12 if it is less than 2%.
If it exceeds Ω, the antistatic performance will be poor, and if it exceeds 30%, the fluidity of polyethylene at high temperatures will decrease, making film formation difficult. The amount of PTFE and/or FEP added is preferably 2 to 50% by weight, and when formed into a sheet, the coefficient of friction is preferably 0.15 or less.
本発明のシートを成膜するには、例としてあら
かじめ所定組成のポリエチレン・カーボンブラツ
ク・PTFE及び／又はFEPを混合し、バンバリー
ミキサーや三本ロールミキサー等で溶融混練し、
ペレタイザーでペレツト状にした後、Ｔダイ押出
機やインフレーシヨン押出機にて成膜する方法が
ある。 To form the sheet of the present invention, for example, polyethylene, carbon black, PTFE and/or FEP of a predetermined composition are mixed in advance, melted and kneaded using a Banbury mixer, a three-roll mixer, etc.
There is a method in which the material is formed into pellets using a pelletizer and then formed into a film using a T-die extruder or an inflation extruder.
本発明の滑りシートを用いることにより次のよ
うな改善効果が見い出される。従来の４フツ化エ
チレン重合物、超高分子量ポリエチレンのシート
に比べ加工性、生産性が向上し、コストが低減で
きる。すなわち４フツ化エチレン重合物等の加工
法はあらかじめ粉体をブロツク状、板状、丸棒に
加熱加圧成型（圧縮成型）しておきこれを切削加
工してシート状にするか、原料に助剤を混ぜ、ペ
ースト状とし押出成型後圧延加工、助剤抽出によ
りシート状にしなければならず、生産効率が低
く、加工コストが高かつたが、本発明では、汎用
樹脂を成膜する方法とまつたく同じ通常の方法で
大量生産が可能となる。また原料も従来の場合は
高価なPTFEや超高分子量ポリエチレンを用いな
ければならなかつたが、本発明によれば安価なポ
リエチレンを主成分とするため、原料コストも低
減できる。また本発明のシートはPTFEよりも剛
性があり、超高分子量ポリエチレンよりも柔かく
適度な剛性をもつため、従来、PTFEで問題とさ
れたシート端面の曲り込み、折れ、破れや超高分
子量ポリエチレンで問題とされた剪断加工性が劣
る、打抜後バリが残る等の欠点をなくすことが可
能となる。 By using the sliding sheet of the present invention, the following improvement effects are found. Compared to conventional tetrafluoroethylene polymer and ultra-high molecular weight polyethylene sheets, processability and productivity are improved, and costs can be reduced. In other words, the processing method for tetrafluoroethylene polymers, etc. is to heat and pressure mold (compression mold) the powder into a block, plate, or round bar in advance and then cut it into a sheet, or to process it as a raw material. It was necessary to mix an auxiliary agent, make it into a paste, extrude it, roll it, and extract the auxiliary agent to form a sheet, resulting in low production efficiency and high processing costs.However, in the present invention, the method of forming a film from a general-purpose resin Mass production becomes possible using the same standard methods. Furthermore, in the conventional case, expensive PTFE or ultra-high molecular weight polyethylene had to be used as the raw material, but according to the present invention, since the main component is inexpensive polyethylene, the raw material cost can be reduced. In addition, the sheet of the present invention is more rigid than PTFE, softer than ultra-high molecular weight polyethylene, and has moderate rigidity. It becomes possible to eliminate problems such as poor shearability and burrs remaining after punching.
第１図及び第２図は本発明のカセツトテープ用
滑りシートを示し、第１図は断面図、第２図は第
１図示のＡ−A′線矢視断面図である。
１……カセツトテープ用滑りシート。
1 and 2 show a sliding sheet for a cassette tape according to the present invention, with FIG. 1 being a sectional view and FIG. 2 being a sectional view taken along the line A--A' in FIG. 1...Sliding sheet for cassette tape.
Claims (1)
〜30重量％、４フツ化エチレン重合物もしくは４
フツ化エチレン−６フツ化プロピレン共重合物も
しくは４フツ化エチレン重合物と４フツ化エチレ
ン−６フツ化プロピレン共重合物の混合物２〜50
重量％を混合した成形材料を成形してなるシート
からなることを特徴とするカセツトテープ用滑り
シート。1 Carbon black on polyolefin resin 2
~30% by weight, tetrafluoroethylene polymer or 4
Ethylene fluoride-propylene hexafluoride copolymer or mixture of ethylene tetrafluoride and propylene tetrafluoride-hexafluoride copolymer 2-50
A sliding sheet for a cassette tape, characterized in that it is made of a sheet formed by molding a molding material mixed with % by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163081A JPS583162A (en) | 1981-06-30 | 1981-06-30 | Slip sheet for cassette tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10163081A JPS583162A (en) | 1981-06-30 | 1981-06-30 | Slip sheet for cassette tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS583162A JPS583162A (en) | 1983-01-08 |
| JPS647430B2 true JPS647430B2 (en) | 1989-02-08 |
Family
ID=14305713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10163081A Granted JPS583162A (en) | 1981-06-30 | 1981-06-30 | Slip sheet for cassette tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS583162A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS508594U (en) * | 1973-05-23 | 1975-01-29 | ||
| JPS5110735U (en) * | 1974-07-10 | 1976-01-26 |
-
1981
- 1981-06-30 JP JP10163081A patent/JPS583162A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS583162A (en) | 1983-01-08 |
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