GB1087519A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1087519A – Process and apparatus for dimensional stabilization of thermoplastic film
– Google Patents

GB1087519A – Process and apparatus for dimensional stabilization of thermoplastic film
– Google Patents
Process and apparatus for dimensional stabilization of thermoplastic film

Info

Publication number
GB1087519A

GB1087519A
GB40007/66A
GB4000766A
GB1087519A
GB 1087519 A
GB1087519 A
GB 1087519A
GB 40007/66 A
GB40007/66 A
GB 40007/66A
GB 4000766 A
GB4000766 A
GB 4000766A
GB 1087519 A
GB1087519 A
GB 1087519A
Authority
GB
United Kingdom
Prior art keywords
roll
film
driven
rolls
over
Prior art date
1965-09-08
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

Application number
GB40007/66A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

EIDP Inc

Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
1965-09-08
Filing date
1966-09-07
Publication date
1967-10-18

1966-09-07
Application filed by EI Du Pont de Nemours and Co
filed
Critical
EI Du Pont de Nemours and Co

1967-10-18
Publication of GB1087519A
publication
Critical
patent/GB1087519A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE

B29D7/00—Producing flat articles, e.g. films or sheets

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

B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor

Abstract

1,087,519. Stabilization of films. E. I. DU PONT DE NEMOURS & CO. Sept. 7, 1966 [Sept. 8, 1965], No. 40007/66. Heading B5B. In a process for the dimensional stabilization of a continuous web of biaxially oriented polypropylene film wherein the film maintained at a temperature within the range of from 120‹ to 150‹ C. is allowed to retract between 5 and 40% in its transverse direction and between 1 and 15% in its longitudinal direction as it is passed successively over a series of driven rolls, the web is passed over and in contact with at least 90 degrees of the circumference of each of a series of idler rolls located between the first and second driven rolls of said series of driven rolls, whereby the major portion of transverse retraction of the film takes place between the first and second driven rolls, guiding the film into smooth contact with at least one of the driven rolls following the last of said idler rolls by passing the film over a guide member immediately adjacent the driven roll which presents a film-spreading surface operative to bow the film of transverse to the direction of travel of the web and contacting the entire width of the web, and thereafter passing said film over the driven roll adjacent thereto. In the operation of the apparatus shown, heated air is circulated through the container E to maintain the atmosphere at from 120‹ to 150‹ C., preferably from 125‹ to 140‹ C. Bi-axially oriented polypropylene film F in the form of a continuous web is guided into the chamber over idler guide roll G and passes between a first driven feed roll 1 and associated nip roll 1A, between driven roll 11 and nip roll 11A, and thence over a series of closely spaced idler rolls 2A, 2B, 2C, 2D, 2E and 2F disposed in static relationship such that the film contacts at least 90‹, and preferably about 180‹ of the circumference of each roll. From the last idler roll the web of film is passed over each of a series of relatively widely spaced driven rolls comprising second driven roll 3, and rolls 4, 5, 6, 7, 8 and 9 and finally over driven take-off roll 10 and its associated nip roll 10A. In the preferred embodiment the film is smoothed out, i.e. longitudinal wrinkles are removed before passing over at least one of the series of driven rolls in the path of the film following the idler rolls by passing the film over a spreading means in the form of a moderately arched or curved spreader rod or roll S the arched surface of which extends transversely of the web and for the full width thereof, and thence over the immediately adjacent driven roll. The radius of curvature of rod S may be from 60 to 40 feet or more. To ensure uniform and efficient heating of the film to the conditioning temperature all but the last of the series of driven rolls are controllably heated by suitable means not shown and the take-off roll 10 is cooled to bring the temperature of the film to near the normal temperature as it leaves the conditioner. To ensure positive traction and uniform contact of the film with the driven intermediate rolls co-operating nip rolls (3A, 4A &c.) each surfaced with an elastomeric material are also preferably associated with each driven intermediate roll. With incoming film which is especially baggy the speed of roll 11 with its associated nip roll 11 A is set slightly higher than the speed of roll 1 to provide a slight pull up of this point; otherwise rolls 1 and 11 are driven at the same speed. When roll 11 is used, relaxation of the film occurs first between this roll and roll 3, referred to above as the second driven roll, in which event roll 11 will become the first driven roll for purposes of defining the position of the idler rolls. The tension on the film and hence the extent of retraction of the film as it passes through the conditioner is controlled by control of the relative speeds of the feed and take-off rolls 1 (or 11) and 10 respectively, by conventional speed control means not shown. The idler rolls are desirably closely spaced, e.g. 4-inch diameter rolls may be used with their centres spaced apart about 6 to 18 inches, and so positioned relatively that the film contacts at least 90 degrees and preferably about 180 degrees of the circumference of each roll. An example illustrates the treatment of polypropylene film.

GB40007/66A
1965-09-08
1966-09-07
Process and apparatus for dimensional stabilization of thermoplastic film

Expired

GB1087519A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US48580665A

1965-09-08
1965-09-08

Publications (1)

Publication Number
Publication Date

GB1087519A
true

GB1087519A
(en)

1967-10-18

Family
ID=23929506
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB40007/66A
Expired

GB1087519A
(en)

1965-09-08
1966-09-07
Process and apparatus for dimensional stabilization of thermoplastic film

Country Status (2)

Country
Link

US
(1)

US3460194A
(en)

GB
(1)

GB1087519A
(en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4038917A
(en)

1972-07-18
1977-08-02
Westvaco Corporation
Thin belt embossing method and apparatus

CN103009647B
(en)

2011-09-28
2015-01-21
陈博彦
Integrated processing device of in-plant production of surface-coated and modified BOPP (Biaxially Oriented Polypropylene) synthetic paper

CN112873814A
(en)

2020-12-24
2021-06-01
沧州东鸿制膜科技有限公司
Flattening and finishing method for nylon film processing semi-finished product

Family Cites Families (6)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2311755A
(en)

1940-06-22
1943-02-23
Du Pont
Apparatus for making sheet wrapping material

US2321635A
(en)

1940-11-26
1943-06-15
Du Pont
Treatment of polyamide films

BE511254A
(en)

1949-08-01

US2916767A
(en)

1956-12-07
1959-12-15
Du Pont
Film casting apparatus including means to restrain transverse shrinkage of the film

US3004284A
(en)

1958-10-23
1961-10-17
Union Carbide Corp
Apparatus for stretching plastic material

DE1221786B
(en)

1961-12-07
1966-07-28
Brueckner Trocknerbau Inh Gern

Device for stretching a sheet of thermoplastic material in the longitudinal direction

1965

1965-09-08
US
US485806A
patent/US3460194A/en
not_active
Expired – Lifetime

1966

1966-09-07
GB
GB40007/66A
patent/GB1087519A/en
not_active
Expired

Also Published As

Publication number
Publication date

US3460194A
(en)

1969-08-12

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