GB930962A - Improvements in and relating to polyethylene terephthalate films - Google Patents
Improvements in and relating to polyethylene terephthalate filmsInfo
- Publication number
- GB930962A GB930962A GB1414561A GB1414561A GB930962A GB 930962 A GB930962 A GB 930962A GB 1414561 A GB1414561 A GB 1414561A GB 1414561 A GB1414561 A GB 1414561A GB 930962 A GB930962 A GB 930962A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stretching
- transverse
- film
- stretch ratio
- polyethylene terephthalate
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/146—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly transversely to the direction of feed and then parallel thereto
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Biaxially oriented polyethylene terephthalate film having a high tensile strength on the longitudinal direction is made from an unstretched amorphous polyethylene terephthalate film by first stretching it transversely to a stretch ratio in the range 2.65:1 to 3.2:1 and then longitudinally to a stretch ratio greater than 5.05:1 at a temperature above 120 DEG C. and at a rate of stretching of at least 5,000%/min. Preferably the transverse stretch ratio does not exceed 3.0:1, transverse stretching being effected at about 80 DEG -100 DEG C. and longitudinal stretching at 120 DEG -160 DEG C. The rate of stretching in the longitudinal direction is desirably less than 100,000%/min. Partial shrinkage of the film may be permitted in the transverse direction during longitudinal stretching. In this case, the transverse stretch first applied to the film may be at a stretch ratio greater than 3.2:1, provided that the shrinkage which takes place during longitudinal stretching brings down the overall transverse extension to 3.2:1 or less. After stretching, the films may be heat-set in known manner while held at, e.g. 150 DEG -230 DEG C. Films so made normally have a yield strength of 30,000 p.s.i. or greater, a tensile break strength of at least 35,000 p.s.i. with an elongation at break not above about 25% and in the transverse direction a yield strength of at least 8,000 p.s.i. A voided film may be made by the use of a higher rate of transverse stretching. Specification 811,066 is referred to.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1414561A GB930962A (en) | 1961-04-19 | 1961-04-19 | Improvements in and relating to polyethylene terephthalate films |
| FR894806A FR1319899A (en) | 1961-04-19 | 1962-04-17 | Improvements to polyethylene terephthalate sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1414561A GB930962A (en) | 1961-04-19 | 1961-04-19 | Improvements in and relating to polyethylene terephthalate films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB930962A true GB930962A (en) | 1963-07-10 |
Family
ID=10035841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1414561A Expired GB930962A (en) | 1961-04-19 | 1961-04-19 | Improvements in and relating to polyethylene terephthalate films |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB930962A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153667A (en) | 1976-07-30 | 1979-05-08 | Owens-Illinois, Inc. | Method of forming articles from thermoplastic materials |
| CN104015348A (en) * | 2006-02-21 | 2014-09-03 | 赛尔格有限责任公司 | Biaxially oriented microporous membrane |
-
1961
- 1961-04-19 GB GB1414561A patent/GB930962A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153667A (en) | 1976-07-30 | 1979-05-08 | Owens-Illinois, Inc. | Method of forming articles from thermoplastic materials |
| CN104015348A (en) * | 2006-02-21 | 2014-09-03 | 赛尔格有限责任公司 | Biaxially oriented microporous membrane |
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