JPS647431B2 - - Google Patents
Info
- Publication number
- JPS647431B2 JPS647431B2 JP2554982A JP2554982A JPS647431B2 JP S647431 B2 JPS647431 B2 JP S647431B2 JP 2554982 A JP2554982 A JP 2554982A JP 2554982 A JP2554982 A JP 2554982A JP S647431 B2 JPS647431 B2 JP S647431B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- tetrafluoroethylene
- polyethylene
- slip sheet
- slip
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 18
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 14
- 229920005672 polyolefin resin Polymers 0.000 claims description 8
- 239000006229 carbon black Substances 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 230000005865 ionizing radiation Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 239000012778 molding material Substances 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
- -1 polyethylene terephthalate Polymers 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000010894 electron beam technology Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004049 embossing Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229920002050 silicone resin Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000006230 acetylene black Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 108010000817 Leuprolide Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration 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
- 239000012752 auxiliary 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
- 238000000748 compression moulding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 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
- 239000006232 furnace black Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RGLRXNKKBLIBQS-XNHQSDQCSA-N leuprolide acetate Chemical compound CC(O)=O.CCNC(=O)[C@@H]1CCCN1C(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](CC(C)C)NC(=O)[C@@H](NC(=O)[C@H](CO)NC(=O)[C@H](CC=1C2=CC=CC=C2NC=1)NC(=O)[C@H](CC=1N=CNC=1)NC(=O)[C@H]1NC(=O)CC1)CC1=CC=C(O)C=C1 RGLRXNKKBLIBQS-XNHQSDQCSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229940087857 lupron Drugs 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
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 238000007493 shaping process 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】
本発明はカセツトテープ用スリツプシート用材
料の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a material for slip sheets for cassette tapes.
従来、一般に用いられているカセツトテープに
おいて、ケースとリールテープの間に摩擦抵抗を
減じ、且つテープの走行を滑らかにするためにス
リツプシートが内蔵されているが、この種のスリ
ツプシート用材料としてはカーボンブラツク、グ
ラフアイト等の導電性物質をテトラフルオロエチ
レンや超高分子量ポリエチレンに混入したもの、
又は上記導電性物質を抄き込んだ紙（導電紙）に
シリコン樹脂を塗布、含浸したもの、又はポリエ
チレンテレフタレートのシートに導電性物質を塗
布したもの等が用いられている。 Conventionally, commonly used cassette tapes have a built-in slip sheet to reduce frictional resistance between the case and reel tape and to smoothen the running of the tape. is a mixture of conductive substances such as carbon black and graphite into tetrafluoroethylene or ultra-high molecular weight polyethylene;
Alternatively, paper (conductive paper) coated with a silicone resin or impregnated with a silicone resin, or a sheet of polyethylene terephthalate coated with a conductive substance, etc., are used.
しかしながら上述したようなスリツプシートは
いずれも次に挙げる何等かの欠点を有している。 However, all of the above-mentioned slip sheets have the following drawbacks.
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軟なため、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するなど耐
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、その製造加
工は一般に用いられる成膜法に比べて特殊な機
械・加工方法によらなければならない。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が
ある。 In other words, since the conductive carbon-containing tetrafluoroethylene polymer sheet is flexible, the end surface of the sheet may bend, fold, or tear when handled, and the sheet may curl into a cigar shape when heated. Because it lacks shape stability, has a high melting point of 320°C or higher, and lacks fluidity at high temperatures, its manufacturing process requires special machinery and processing methods compared to commonly used film-forming methods. Therefore, there is a drawback that the processing cost is high in addition to the raw material cost.
次に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材料コスト面を改良した
ものとして市販されたものであるが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、その製造加工を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する特殊な
加工方法によらなければならず、生産効率が低
く、加工コストが高いという欠点がある。 Next, conductive carbon-containing ultra-high molecular weight polyethylene is commercially available as a product that improves the above-mentioned drawbacks of tetrafluoroethylene polymer sheets, and in particular improves the flexibility and raw material cost of conductive carbon-containing tetrafluoroethylene polymer sheets. However, like tetrafluoroethylene polymer, it lacks fluidity at high temperatures, so it is manufactured by heating and press-molding ultra-high molecular weight polyethylene powder and carbon powder to form a block, and then forming it into a block shape to the desired thickness. This requires a special processing method for cutting the film, which has the drawbacks of low production efficiency and high processing costs.
また導電紙にシリコン樹脂を塗布、含浸したも
のやポリエチレンテレフタレートシートに導電性
物質を塗布したもの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
が劣るという欠点がある。 Conductive paper coated or impregnated with silicone resin or polyethylene terephthalate sheet coated with a conductive substance have the advantage of low cost, but have the disadvantage of inferior performance, especially poor surface smoothness and abrasion resistance. There is.
本発明者は上記の欠点、特に加工性、価格面を
改良すると共にカセツトテープ用スリツプシート
に必要な性能のうち特に剛性と耐熱性に優れたス
リツプシート用材料を開発すべく研究の結果、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
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押出し製膜後、電離放射線
を照射することにより剛性と耐熱性に優れたスリ
ツプシート用材料を得ることができることを見い
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, the present inventor has developed a polyolefin material in order to improve the above-mentioned drawbacks, particularly in terms of processability and price, and to develop a material for slip sheets that has particularly excellent rigidity and heat resistance among the performances required for slip sheets for cassette tapes. 2 to 30% by weight of carbon black in the system resin, tetrafluoroethylene polymer or tetrafluoroethylene-hexafluoropropylene copolymer, or tetrafluoroethylene polymer and tetrafluoroethylene-6
2-50% by weight mixture of fluorinated propylene copolymer
The inventors discovered that a slip sheet material with excellent rigidity and heat resistance could be obtained by extruding a molding material mixed with the above and irradiating it with ionizing radiation, and based on this knowledge, the present invention was completed. .
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
押出し製膜後、電離放射線を照射することを特徴
とするカセツトテープ用スリツプシート用材料の
製造方法である。 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. This is a method for producing a slip sheet material for a cassette tape, which comprises extruding a molding material containing 2 to 50% by weight of a hexafluorinated propylene copolymer and then irradiating it with ionizing radiation.
以下、本発明の製造方法につき、詳細に説明す
る。 Hereinafter, the manufacturing method of the present invention will be explained in detail.
先ず、ポリオレフイン系樹脂にカーボンブラツ
ク２〜30重量％、４フツ化エチレン混合物（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の混合物２〜50重量％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
厚み30〜150μのシートを押出し製膜する。 First, 2 to 30% by weight of carbon black and a tetrafluoroethylene mixture (hereinafter referred to as
PTFE) or tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP) or a mixture of PTFE and FEP (2 to 50% by weight) are mixed and melted and kneaded using a Banbury mixer, three-roll mixer, etc., and then mixed with a pelletizer. After pelletizing, a sheet with a thickness of 30 to 150 μm is formed by extrusion using a T-die extruder or an inflation extruder.
次いで得られたシートに電離放射線を照射する
ことにより剛性及び耐熱性が優れたカセツトテー
プ用スリツプシート用材料を得ることができる。 Next, by irradiating the obtained sheet with ionizing radiation, a material for a slip sheet for a cassette tape having excellent rigidity and heat resistance can be obtained.
第１図及び第２図は上記の製造方法により得た
カセツトテープ用スリツプシート用材料を用いて
なるカセツトテープ用スリツプシート１を示し、
２はスリツプシートの突起部を示す。 FIGS. 1 and 2 show a slip sheet 1 for cassette tape using the material for slip sheet for cassette tape obtained by the above manufacturing method,
2 shows the protrusion of the slip sheet.
而して、本発明の製造方法において、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特に良く、こ
の材料は、低コストで且つ適度な剛度、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製膜する時に
使用するＴダイ押出機やインフレーシヨン押出機
を利用して製膜できる。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エチレン−酢酸ビ
ニル共重合体、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形可能な樹脂を利用
することもできる。更にポリオレフイン系樹脂の
代りにポリ塩化ビニルを用いても良い。 In the production method of the present invention, the polyolefin resin is polyethylene for extrusion molding, and has a melt index of about 0.01 to 10.0 g/10 minutes, preferably 0.05 to 5.0 g/10 minutes, and a density of
High-density polyethylene of 0.940 or higher is particularly good. This material is low cost, has appropriate stiffness and impact resistance, and has better processability than conventional ultra-high molecular weight polyethylene or tetrafluoroethylene polymers. 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, as a polyolefin resin instead of polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, polypropylene, polyethylene and various additives, such as antioxidants, lubricants, antiblocking agents, antistatic agents, fillers, etc. It is also possible to use extrusion moldable resins such as resins containing agents and ionomer resins. Furthermore, polyvinyl chloride may be used instead of polyolefin resin.
次に本発明の製造方法において、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100〜400c.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
されているものを用いることができる。また
PTFE及び／又はFEP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。 Next, in the manufacturing method of the present invention, the carbon black to be mixed with the polyolefin resin is as follows:
Conductive carbon black powder, particle size 10~60nm, oil absorption 100~400c.c./100g,
It is possible to use those produced by the thermal decomposition method of acetylene or the incomplete combustion method of heavy oil, and which are commercially available under the names of Kettien black, acetylene black, furnace black, etc. Also
As PTFE and/or FEP, an additive powder is used, preferably one having a particle size of 10 μm or less.
本発明の製造方法においてカーボンブラツクの
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102〜1012
Ωの範囲に入ることが好ましく、２％以下だと
1012Ω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。 In the manufacturing method of the present invention, the composition ratio of carbon black is 2 to 30% by weight,
When formed into a sheet, the surface resistance value is 10 2 to 10 12
It is preferable to fall within the range of Ω, and if it is less than 2%.
If it is 10 12 Ω or more, the antistatic performance will be poor, and if it is 30% or more, the fluidity of polyethylene at high temperatures will decrease, making film formation difficult.
次に本発明の製造方法においてPTFE及び／又
はFEPの添加量は２〜50重量％で、シートに成
形した場合において摩擦係数が0.15以下になるこ
とが好ましく、２重量％以下だと摩擦係数が0.15
以上となり、効果が認められず、一方50重量％以
上だと成膜加工性が悪くなる。 Next, in the manufacturing method of the present invention, the amount of PTFE and/or FEP added is 2 to 50% by weight, and when formed into a sheet, it is preferable that the coefficient of friction is 0.15 or less, and if it is 2% by weight or less, the coefficient of friction is 0.15
If the amount exceeds 50% by weight, the film forming processability deteriorates.
次に本発明の製造方法において、電離放射線と
しては電子線、紫外線、原子・分子・分子セグメ
ントのイオン等の重粒子線、高周波、α線、γ
線、Ｘ線等を用い得るが、大気中で使用でき、安
全でかつ制御が容易な電子線が工業的に適してい
る。以上のような電離放射線の照射条件は線源及
び照射される材料によつても異なるが、照射後の
材料のゲル分率が５〜90％になるように定めれば
よく、前記した線源のうち、電子線源を使用する
ときは、加速電圧50〜1000KV、好ましくは150
〜450KV、照射線量１〜50Mrad、好ましくは３
〜30Mradである。又、紫外線を用いるときは紫
外線源として強度80〜100W／cmのものを１〜10
灯使用する。 Next, in the production method of the present invention, the ionizing radiation includes electron beams, ultraviolet rays, heavy particle beams such as ions of atoms, molecules, and molecular segments, high frequency radiation, α rays, γ rays, etc.
Although radiation, X-rays, etc. can be used, electron beams are industrially suitable because they can be used in the atmosphere, are safe, and are easy to control. Irradiation conditions for ionizing radiation as described above vary depending on the radiation source and the material to be irradiated, but they may be set so that the gel fraction of the material after irradiation is 5 to 90%. Among them, when using an electron beam source, the accelerating voltage is 50-1000KV, preferably 150KV.
~450KV, irradiation dose 1~50Mrad, preferably 3
~30 Mrad. In addition, when using ultraviolet rays, use one with an intensity of 80 to 100 W/cm as an ultraviolet source.
Use lights.
以上の電離放射線による照射を行うと、照射さ
れたシート中のポリオレフイン系樹脂が活性化さ
れてラジカルを生じ、ラジカル反応により架橋化
が進行するものと考えられ、照射後シートの剛
性、耐熱性が増加する。従来の４フツ化エチレン
重合物や導電紙にシリコンを塗布したシートは、
剛性、耐熱性に欠け、第１，２図のようなスリツ
プシートの所定形状にするためのエンボス、及び
抜き適性が悪く、且つカセツトテープ装填適性が
問題になつている。また、磁気テープの走行時に
磁気テープとスリツプシートの間で発生する摩擦
熱のため従来のものは、カールしたりする支障が
起きる。それに対して本発明の制造方法によれ
ば、従来のものより加工しやすい、耐熱性と剛性
を兼ね備えたシートを製造できるのみならず従来
の４フツ化エチレン重合物、あるいは超高分子量
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、本発明によれば汎用樹脂を製膜する方法とま
つたく同じ通常の方法で大量生産が可能である。 It is thought that when irradiated with the above ionizing radiation, the polyolefin resin in the irradiated sheet is activated and generates radicals, and crosslinking progresses due to the radical reaction, resulting in a decrease in the rigidity and heat resistance of the sheet after irradiation. To increase. Conventional sheets made of tetrafluoroethylene polymer or conductive paper coated with silicone are
It lacks rigidity and heat resistance, has poor embossing and punching properties for shaping the slip sheet into a predetermined shape as shown in FIGS. 1 and 2, and has problems in its suitability for loading into cassette tapes. In addition, the conventional magnetic tape has problems such as curling due to frictional heat generated between the magnetic tape and the slip sheet when the magnetic tape runs. In contrast, according to the manufacturing method of the present invention, it is possible to not only manufacture a sheet that is easier to process than conventional sheets and has both heat resistance and rigidity, but also a sheet made of conventional tetrafluoroethylene polymer or ultra-high molecular weight polyethylene. Processability and productivity are improved and costs can be reduced compared to conventional methods. In other words, the processing method for tetrafluoroethylene polymers, etc. is to heat and pressure mold the powder into blocks, plates, or round bars (compression molding).
Either keep it and cut it into a sheet shape, or
The raw materials had to be mixed with an auxiliary agent, made into a paste, extruded, rolled, and extracted to form a sheet, resulting in low production efficiency and high processing costs.However, according to the present invention, it is possible to produce a general-purpose resin. It can be mass-produced using the same conventional method as that used for film production.
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用いる
ことができるため低コストでスリツプシートを製
造できる。 Furthermore, in the conventional case, expensive PTFE or ultra-high molecular weight polyethylene had to be used as raw materials, but according to the present invention, inexpensive polyethylene can be used, so slip sheets can be manufactured at low cost.
次に実施例をあげて本発明につき具体的に説明
する。 Next, the present invention will be specifically explained with reference to Examples.
実施例
押出し成形用高密度ポリエチレンとして3300F
（三井石油化学製、メルトフローインデツクス１、
２）を用い、導電性カーボンブラツクとしてデン
カブラツク（電気化学工業製、アセチレンブラツ
ク）20重量％と添加剤用PTFEとしてルプロンＬ
−５（ダイキン工業製、粒径5μ）５重量％をパン
バリーミキサーで溶融混練後、インフレーシヨン
押出機で製膜した。Example 3300F as high density polyethylene for extrusion molding
(Mitsui Petrochemical, Melt Flow Index 1,
2) was used, 20% by weight of Denka Black (manufactured by Denki Kagaku Kogyo, Acetylene Black) as conductive carbon black and Lupron L as PTFE for additive.
-5 (manufactured by Daikin Industries, Ltd., particle size 5μ) 5% by weight was melt-kneaded in a Panbury mixer and then formed into a film using an inflation extruder.
このシートに、リニアフイラメント型電子照射
装置で、加速電圧175KV、照射線量20Mradの条
件で電子線を照射した。照射後のシートは照射前
に比して、外観上の変化はほとんどなく、摩擦係
数、導電性は照射前と差はなく、80℃における熱
収縮率は照射前に0.5％であつたのが0.05％に減
少し、剛性は向上しカールも起きにくくなつた。
又、エンボス、及び抜き適性も改善された。 This sheet was irradiated with an electron beam using a linear filament type electron irradiation device under conditions of an acceleration voltage of 175 KV and an irradiation dose of 20 Mrad. The sheet after irradiation showed almost no change in appearance compared to before irradiation, the coefficient of friction and conductivity were the same as before irradiation, and the thermal shrinkage rate at 80℃ was 0.5% before irradiation. The stiffness has been reduced to 0.05%, and the rigidity has improved and curls are less likely to occur.
Embossing and punching suitability were also improved.
以上、詳記した通り、本発明によれば剛性及び
耐熱性に優れた、エンボス、及び抜き適性の良好
なスリツプカセツトテープ用スリツプシート用材
料を低コストで汎用の製膜法によつて製造するこ
とができる。 As detailed above, according to the present invention, a slip sheet material for slip cassette tapes having excellent rigidity and heat resistance and good embossing and punching properties is manufactured at low cost by a general-purpose film forming method. be able to.
第１図及び第２図は本発明の製造方法により製
造したカセツトテープ用スリツプシート用材料を
用いてなるカセツトテープ用スリツプシートを示
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 and 2 show a slip sheet for a cassette tape using the material for a slip sheet for a cassette tape manufactured by the manufacturing method of the present invention, FIG. 1 is a sectional view, and FIG. A-
It is a sectional view taken along the line A'.
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押出し製膜後、電離
放射線を照射することを特徴とするカセツトテー
プ用スリツプシート用材料の製造方法。 ２ 前記ポリオレフイン系樹脂として高密度ポリ
エチレンを用いることを特徴とする特許請求の範
囲第１項記載のカセツトテープ用スリツプシート
用材料の製造方法。[Claims] 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
1. A method for producing a material for a slip sheet for a cassette tape, which comprises extruding a molding material having a mixed weight percentage and then irradiating it with ionizing radiation. 2. The method for producing a material for a slip sheet for a cassette tape according to claim 1, characterized in that high-density polyethylene is used as the polyolefin resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2554982A JPS58143475A (en) | 1982-02-19 | 1982-02-19 | Manufacture of compound for split sheet for cassette tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2554982A JPS58143475A (en) | 1982-02-19 | 1982-02-19 | Manufacture of compound for split sheet for cassette tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58143475A JPS58143475A (en) | 1983-08-26 |
| JPS647431B2 true JPS647431B2 (en) | 1989-02-08 |
Family
ID=12169040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2554982A Granted JPS58143475A (en) | 1982-02-19 | 1982-02-19 | Manufacture of compound for split sheet for cassette tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58143475A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61229555A (en) * | 1985-04-05 | 1986-10-13 | 大日本印刷株式会社 | Transparent slip sheet material for cassette tape |
| JPH0754620B2 (en) * | 1985-08-21 | 1995-06-07 | 大日本印刷株式会社 | Transparent sheet material for reel type cassette tape |
| US4904735A (en) * | 1988-07-08 | 1990-02-27 | E. I. Du Pont De Nemours And Company | Processing aid for polymers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS508594U (en) * | 1973-05-23 | 1975-01-29 | ||
| JPS5110735U (en) * | 1974-07-10 | 1976-01-26 | ||
| JPS5349416A (en) * | 1976-10-18 | 1978-05-04 | Asahi Chemical Ind | Cassette tape back sheet |
-
1982
- 1982-02-19 JP JP2554982A patent/JPS58143475A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58143475A (en) | 1983-08-26 |
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