JPS635255B2 - - Google Patents
Info
- Publication number
- JPS635255B2 JPS635255B2 JP56132705A JP13270581A JPS635255B2 JP S635255 B2 JPS635255 B2 JP S635255B2 JP 56132705 A JP56132705 A JP 56132705A JP 13270581 A JP13270581 A JP 13270581A JP S635255 B2 JPS635255 B2 JP S635255B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- heat shrinkage
- biaxially stretched
- shrinkage rate
- present
- 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
- 229920006267 polyester film Polymers 0.000 claims description 9
- 229920000728 polyester Polymers 0.000 claims description 3
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 claims description 2
- -1 polyethylene Polymers 0.000 description 12
- 239000004698 Polyethylene Substances 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 150000001991 dicarboxylic acids Chemical class 0.000 description 2
- 150000002009 diols Chemical class 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical class OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 150000002466 imines Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2375/00—Polyureas; Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
Description
本発明は、三方シール袋用2軸延伸ポリエステ
ルフイルムに関するものである。
従来、2軸延伸ポリエステルフイルムは、機械
的強度、耐水性、耐薬品性、寸法安定性、透明性
等が優れている点から種々の用途に用いられ、ま
た、酸素、香り、油等の低透過性、食品衛生上有
害な添加剤を含まないなどの長所によつて、包装
素材としても広く用いられている。
そして、この2軸延伸ポリエステルフイルムは
三方シール袋として使用される場合が多いが、こ
れは一般に2軸延伸ポリエステルフイルムにイミ
ン系、ウレタン系等の接着層を塗布し、次いでポ
リエチレンをラミネートした後、ポリエチレン層
をシール面として熱シールされ製袋されている。
しかし、かかる従来の2軸延伸ポリエステルフ
イルムを用いた三方シール袋は、コーナー部が袋
面平面に対して、起き上りあるいは垂れ下り現象
(いわゆるツイスト現象)を生じ、三方シール袋
への内容物の自動充填の際に、トラブルを生ずる
原因となつている。
このツイスト現象は、使用される2軸延伸フイ
ルムの熱収縮特性の不均一性によつて生ずるもの
であるが、延伸軸方向すなわち縦、横の熱収縮率
をバランスさせたフイルムを用いても充分に改善
はできなかつた。
本発明者らは、このツイスト現象が熱収縮特性
の異方性に起因するものとの観点から鋭意検討の
結果、本発明に到達したものである。
本発明の目的は、上記ツイスト現象の生じない
袋を製造するための2軸延伸ポリエステルフイル
ムを提供せんとするものである。
本発明は上記目的を達成するため次の構成、す
なわち、エチレンテレフタレートを主たるくり返
し単位とするポリエステルからなり、延伸軸に対
して45゜方向の熱収縮率と135゜方向の熱収縮率と
の差の絶対値がフイルムの各部において0.5%以
下である三方シール袋用2軸延伸ポリエステルフ
イルムをを特徴とするものである。
本発明において用いられるポリエステルフイル
ムは、80モル%以上がポリエチレンテレフタレー
トからなる2軸延伸フイルムであつて、そのフイ
ルム組成物には、ジエチレングリコール、エチレ
ングリコール、ポリオキシエチレングリコール、
プロピレングリコール、テトラメチレングリコー
ル、ヘキサメチレングリコール、ペンタエリスリ
トール等のジオール成分、イソフタル酸、フタル
酸、テレフタル酸、アジピン酸、セバチン酸等の
ジカルボン酸、p−ヒドロキシ安息香酸等のヒド
ロキシカルボン酸等を共重合または、これらのジ
オール、ジカルボン酸、オキシカルボン酸からな
るポリエステルを添加配合あるいは複合させても
よい。また、フイルム組成物中にはナイロン、ポ
リプロピレン、ポリエチレン、ポリエチレンオキ
シド−プロピレンオキシドコポリマ等のポリマ、
無機微粒子等の改質剤を添加配合させてもよい。
なお、そのフイルムの表面には、必要に応じて
コロナ放電処理、コーテイング、印刷等が行われ
てもよい。
本発明における延伸軸とは、ポリエチレンテレ
フタレートフイルムを2軸に延伸する際の延伸方
向を指し、通常ロール巻きされた状態でロール幅
方向が横、フイルム長さ方向が縦である。そし
て、45゜方向、135゜方向とは、上記縦あるいは横
の何れか一方を基準(0゜)として示される方向で
ある。
本発明のフイルムは、延伸軸に対して45゜方向
の熱収縮率と135゜方向の熱収縮率との差の絶対値
がフイルムの各部において0.5%以下、好ましく
は、0.3%以下であることが必要で、この値が0.5
%をこえるフイルムではツイスト現象が大きくな
り実用上支障をきたす。
なお、熱収縮率は、荷重25g/mm2、150℃の温
度で30分保持したときの測定値を指し、その熱収
縮率の測定個所は、一般にポリエステルフイルム
は横方向に差を生じ易いので、横方向に数点選定
すればよい。
以上述べたように、本発明のフイルムは、延伸
軸に対して45゜方向および135゜方向の熱収縮率の
差の絶対値を0.5%以下としたので、そのフイル
ムで三方シール袋を作成した場合、その袋のツイ
スト現象を、非常に小さくすることができる。
以下に本発明の実施態様を説明する。
なお、実施例における熱収縮率Aとは、延伸軸
に対して45゜および135゜方向の荷重25g/mm2下で
150℃の温度で30分間保持したときの熱収縮率の
差の絶対値である。
また、熱収縮率Bとは、タテ、ヨコの延伸軸に
夫々平行な方向の荷重25g/mm2下で150℃の強度
で30分間保持したときの熱収縮率の差の絶対値で
ある。ここで、タテとはフイルムの巻長さ方向を
指し、ヨコとはそれに直角な方向を指す。
実施例
極限粘度0.65のポリエチレンテレフタレートチ
ツプを十分に真空乾燥し、280℃に加熱された押
出機に供給してT字型口金よりフイルム状に成形
した。このフイルムを表面温度85℃のロール群に
通し3.0倍にタテ延伸したのち30℃のロール群で
冷却した。続いてこのフイルムの両端をクリツプ
で把持してテンター内で120℃の雰囲気下で3.5倍
にヨコ延伸し、さらにテンター内で10秒間、種々
の熱処理温度及びヨコ方向の弛緩率(第1表中に
記載した。)で熱処理し、厚さ12μmの7種類の
2軸延伸フイルムを得た。
得られた7種類のポリエチレンテレフタレート
2軸延伸フイルムをウレタン系接着層を介してポ
リエチレンを積層し、ポリエチレン層を熱接着す
る通常の方法で作成した三方シール袋のツイスト
現象の程度は表のとおりであつた。
The present invention relates to a biaxially stretched polyester film for three-sided seal bags. Conventionally, biaxially stretched polyester films have been used for various purposes due to their excellent mechanical strength, water resistance, chemical resistance, dimensional stability, transparency, etc. It is also widely used as a packaging material due to its permeability and lack of additives harmful to food hygiene. This biaxially stretched polyester film is often used as a three-sided seal bag, but this is generally done by applying an imine-based, urethane-based, etc. adhesive layer to the biaxially stretched polyester film, and then laminating polyethylene. Bags are heat-sealed using a polyethylene layer as a sealing surface. However, in the conventional three-sided sealed bag using biaxially stretched polyester film, the corner portion rises or hangs down (so-called twist phenomenon) with respect to the bag surface plane, and the contents of the three-sided sealed bag are This causes trouble during automatic filling. This twisting phenomenon is caused by the non-uniformity of the heat shrinkage properties of the biaxially stretched film used, but it is sufficient to use a film that has a balanced heat shrinkage rate in the direction of the stretching axis, that is, in the vertical and horizontal directions. No improvement could be made. The present inventors have arrived at the present invention as a result of intensive studies from the viewpoint that this twist phenomenon is caused by anisotropy of heat shrinkage characteristics. An object of the present invention is to provide a biaxially stretched polyester film for manufacturing bags that does not suffer from the above-mentioned twist phenomenon. In order to achieve the above object, the present invention has the following configuration, that is, it is made of polyester having ethylene terephthalate as the main repeating unit, and the difference between the heat shrinkage rate in the 45° direction and the heat shrinkage rate in the 135° direction with respect to the drawing axis. The present invention is characterized by a biaxially stretched polyester film for three-sided seal bags, in which the absolute value of is 0.5% or less in each part of the film. The polyester film used in the present invention is a biaxially stretched film containing 80 mol% or more of polyethylene terephthalate, and the film composition includes diethylene glycol, ethylene glycol, polyoxyethylene glycol,
Diol components such as propylene glycol, tetramethylene glycol, hexamethylene glycol, and pentaerythritol; dicarboxylic acids such as isophthalic acid, phthalic acid, terephthalic acid, adipic acid, and sebacic acid; and hydroxycarboxylic acids such as p-hydroxybenzoic acid. It may be polymerized, or a polyester consisting of these diols, dicarboxylic acids, and oxycarboxylic acids may be added or compounded. In addition, the film composition may contain polymers such as nylon, polypropylene, polyethylene, polyethylene oxide-propylene oxide copolymers, etc.
Modifiers such as inorganic fine particles may also be added. Note that the surface of the film may be subjected to corona discharge treatment, coating, printing, etc., if necessary. The stretching axis in the present invention refers to the stretching direction when a polyethylene terephthalate film is stretched biaxially, and usually when wound in a roll, the width direction of the roll is horizontal and the length direction of the film is vertical. The 45° direction and the 135° direction are directions shown with either the vertical or horizontal direction as a reference (0°). In the film of the present invention, the absolute value of the difference between the heat shrinkage rate in the 45° direction and the heat shrinkage rate in the 135° direction with respect to the stretching axis is 0.5% or less, preferably 0.3% or less in each part of the film. is required and this value is 0.5
%, the twisting phenomenon becomes so large that it becomes a practical problem. The heat shrinkage rate refers to the value measured when the load is 25g/mm 2 and the temperature is held at 150°C for 30 minutes. , just select several points in the horizontal direction. As mentioned above, since the film of the present invention has an absolute value of the difference in heat shrinkage rate in the 45° direction and the 135° direction with respect to the stretching axis, which is 0.5% or less, a three-sided sealed bag was made with the film. In this case, the twisting phenomenon of the bag can be made very small. Embodiments of the present invention will be described below. In addition, the heat shrinkage rate A in the examples is under a load of 25 g/mm 2 in directions of 45° and 135° with respect to the stretching axis.
This is the absolute value of the difference in thermal shrinkage when held at a temperature of 150°C for 30 minutes. The heat shrinkage rate B is the absolute value of the difference in heat shrinkage rates when the film is held at a strength of 150° C. for 30 minutes under a load of 25 g/mm 2 in directions parallel to the vertical and horizontal stretching axes, respectively. Here, vertical refers to the length direction of the film, and horizontal refers to the direction perpendicular to that direction. EXAMPLE Polyethylene terephthalate chips having an intrinsic viscosity of 0.65 were sufficiently vacuum dried, fed into an extruder heated to 280°C, and molded into a film through a T-shaped nozzle. This film was passed through a group of rolls with a surface temperature of 85°C, vertically stretched 3.0 times, and then cooled with a group of rolls with a surface temperature of 30°C. Next, both ends of this film were held with clips, and the film was horizontally stretched 3.5 times in an atmosphere of 120°C in a tenter, and then stretched in the tenter for 10 seconds at various heat treatment temperatures and relaxation rates in the horizontal direction (see Table 1). ) to obtain seven types of biaxially stretched films each having a thickness of 12 μm. The degree of twist phenomenon of three-sided sealed bags made by laminating the obtained seven types of biaxially stretched polyethylene terephthalate films with polyethylene via a urethane adhesive layer and thermally bonding the polyethylene layers is as shown in the table. It was hot.
【表】
表中ツイスト現象程度(級)は、次の基準で判
定した。
1級:ツイスト現象はほとんど起こらない。
2級:ツイスト現象は若干起こるが許容限度内。
3級:ツイスト現象が大きく、許容不可レベル。
第1表から明らかなように、No.2、No.6、No.7
のごとく、タテとヨコの熱収縮率Bをバランスさ
せただけではツイスト現象程度は改善されない。
また、No.1〜No.4とNo.5〜No.7とを対比すれば
明らかなように、ツイスト現象は、熱収縮率Bの
値とほとんど関係せず、熱収縮率Aの最高値を小
さくすることによつて改善される。[Table] The degree (grade) of the twist phenomenon in the table was determined based on the following criteria. Grade 1: Twist phenomenon hardly occurs. Grade 2: A slight twisting phenomenon occurs, but it is within the allowable limit. Grade 3: The twist phenomenon is large and is at an unacceptable level. As is clear from Table 1, No. 2, No. 6, No. 7
As shown in the figure, the degree of twisting phenomenon cannot be improved simply by balancing the vertical and horizontal thermal contraction rates B. Moreover, as is clear from comparing No. 1 to No. 4 and No. 5 to No. 7, the twist phenomenon has almost no relationship with the value of thermal contraction rate B, and the highest value of thermal contraction rate A This can be improved by making the value smaller.
Claims (1)
位とするポリエステルからなり、延伸軸に対して
45゜方向の熱収縮率と135゜方向の熱収縮率との差
の絶対値がフイルムの各部において0.5%以下で
ある三方シール袋用2軸延伸ポリエステルフイル
ム。1 Made of polyester with ethylene terephthalate as the main repeat unit,
A biaxially stretched polyester film for three-sided seal bags in which the absolute value of the difference between the heat shrinkage rate in the 45° direction and the heat shrinkage rate in the 135° direction is 0.5% or less in each part of the film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13270581A JPS5836413A (en) | 1981-08-26 | 1981-08-26 | Biaxially orientated polyester film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13270581A JPS5836413A (en) | 1981-08-26 | 1981-08-26 | Biaxially orientated polyester film |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5836413A JPS5836413A (en) | 1983-03-03 |
JPS635255B2 true JPS635255B2 (en) | 1988-02-02 |
Family
ID=15087628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13270581A Granted JPS5836413A (en) | 1981-08-26 | 1981-08-26 | Biaxially orientated polyester film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5836413A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108127903A (en) * | 2018-02-12 | 2018-06-08 | 佛山市盟思拉伸机械有限公司 | The two-way heat setting method of lithium battery diaphragm |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2672951B2 (en) * | 1987-10-20 | 1997-11-05 | 株式会社芝浦製作所 | Switching drive circuit |
JP3569987B2 (en) † | 1994-12-22 | 2004-09-29 | 東洋紡績株式会社 | Biaxially oriented polyamide resin film |
US6623821B1 (en) * | 1995-03-31 | 2003-09-23 | E. I. Du Pont De Nemours And Company | Heat-shrinkable, heat-sealable polyester film for packaging |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50145480A (en) * | 1974-05-16 | 1975-11-21 | ||
JPS5191973A (en) * | 1975-02-12 | 1976-08-12 | FUIRUMUNONETSUSHORIHOHO | |
JPS5434206A (en) * | 1977-08-23 | 1979-03-13 | Teijin Ltd | Polyester film |
-
1981
- 1981-08-26 JP JP13270581A patent/JPS5836413A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50145480A (en) * | 1974-05-16 | 1975-11-21 | ||
JPS5191973A (en) * | 1975-02-12 | 1976-08-12 | FUIRUMUNONETSUSHORIHOHO | |
JPS5434206A (en) * | 1977-08-23 | 1979-03-13 | Teijin Ltd | Polyester film |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108127903A (en) * | 2018-02-12 | 2018-06-08 | 佛山市盟思拉伸机械有限公司 | The two-way heat setting method of lithium battery diaphragm |
Also Published As
Publication number | Publication date |
---|---|
JPS5836413A (en) | 1983-03-03 |
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