GB862966A - Making uniformly oriented polymer film - Google Patents

Making uniformly oriented polymer film

Info

Publication number
GB862966A
GB862966A GB20471/57A GB2047157A GB862966A GB 862966 A GB862966 A GB 862966A GB 20471/57 A GB20471/57 A GB 20471/57A GB 2047157 A GB2047157 A GB 2047157A GB 862966 A GB862966 A GB 862966A
Authority
GB
United Kingdom
Prior art keywords
tube
orifice
polymer
pinch rolls
extrusion
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
Application number
GB20471/57A
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.)
Dow Chemical Co
Original Assignee
Dow Chemical 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.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Publication of GB862966A publication Critical patent/GB862966A/en
Expired legal-status Critical Current

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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Abstract

862,966. Films. DOW CHEMICAL CO. June 28, 1957 [July 11, 1956], No. 20471/57. Class 2(2). Films are made from polystyrene, polyvinyltoluene, or copolymers of styrene or vinyl toluene with one another or with alphamethylstyrene or acrylonitrile by supplying the polymer in homogeneously molten condition at from 170-200 ‹C. and advancing it toward a downwardly directed tube-forming extrusion orifice having a vertical axis, cooling it during its advance and extruding it in tubular form through the orifice at a constant lower temperature of 130‹C. to 170‹C., conducting the extruded tube downwardly through a non-reactive gaseous atmosphere at a temperature at least 40 ‹C. below the heat-distortion point of the polymer and thence through the nip of a pair of horizontally disposed pinch rolls, maintaining an air bubble trapped within the tube between the pinch rolls and the extrusion orifice under a small but positive superatmospheric pressure, of sufficient volume to stretch the tube radially to the desired extent before it is cooled below its heat distortion temperature, and driving the pinch rolls at a peripheral speed greater than the linear rate of extrusion of the tube to effect about as much longitudinal stretching in the hot tube as the amount of radial stretching effected by the entrapped air bubble. Preferably the polymer is cooled to a constant temperature in the range 140-155‹C. just prior to extrusion, and the non-reactive gaseous atmosphere is still air. As shown, the polymer tube may be passed through a guide ring, concentric with and larger than the orifice but smaller than the ultimate diameter of the inflated tube, positioned beneath the orifice to fit slidably about the moving tube. The guide ring may be internally cooled. A suitable guide ring is disclosed in Specification 862,967. The inflated film may, as shown, be collapsed by two converging banks of horizontal guide rolls, and radiant or convected heat may be applied to the tube over the area nearest the pinch rolls, to remove wrinkles.
GB20471/57A 1956-07-11 1957-06-28 Making uniformly oriented polymer film Expired GB862966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US862966XA 1956-07-11 1956-07-11

Publications (1)

Publication Number Publication Date
GB862966A true GB862966A (en) 1961-03-15

Family

ID=22197620

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20471/57A Expired GB862966A (en) 1956-07-11 1957-06-28 Making uniformly oriented polymer film

Country Status (1)

Country Link
GB (1) GB862966A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7824773B2 (en) 2006-07-27 2010-11-02 Dow Global Technologies Inc. Shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
US8187685B2 (en) 2006-08-24 2012-05-29 Dow Chemical Technologies LLC Window envelopes with scratch resistant window film patches
US8431198B2 (en) 2007-10-02 2013-04-30 Dow Global Technologies Inc. Multilayer coextruded shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
CN105149888A (en) * 2015-10-15 2015-12-16 天津索玛科技有限公司 Machining method for degradable polymer intravascular stent

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7824773B2 (en) 2006-07-27 2010-11-02 Dow Global Technologies Inc. Shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
US8187685B2 (en) 2006-08-24 2012-05-29 Dow Chemical Technologies LLC Window envelopes with scratch resistant window film patches
US8431198B2 (en) 2007-10-02 2013-04-30 Dow Global Technologies Inc. Multilayer coextruded shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
CN105149888A (en) * 2015-10-15 2015-12-16 天津索玛科技有限公司 Machining method for degradable polymer intravascular stent

Similar Documents

Publication Publication Date Title
US2720680A (en) Methods and machines for producing tubing and sheeting
US2688773A (en) Dimensional stabilization of oriented thermoplastic films
US3888609A (en) Apparatus for producing films in accordance with the blown tube process
US3544667A (en) Process for biaxially stretching thermoplastic tubular film
GB921308A (en) Process for producing polymeric tubular films
US3819776A (en) Process and apparatus for the production of tubes and tubular films
GB654550A (en) Method of making flattened thermoplastic tubing of predetermined desired characteristics
US3754067A (en) Blown tube production
GB1044068A (en) Production of coated biaxially oriented linear highly crystalline polyolefin films
US3959425A (en) Method for extruding tubular thermoplastic film
US3400184A (en) Process and apparatus for preparing film from thermoplastic resins
GB1189999A (en) Production of Biaxially Oriented Films
GB1009842A (en) Method and apparatus for producing sheets of foamed plastics material
US2448433A (en) Making wrinkle-free film
GB686625A (en) Improvements in or relating to a method of making plastic tubes and films
US3008185A (en) Extrusion process and apparatus for forming tubular film
US3121760A (en) Method of extruding polystyrene tube
GB922085A (en) Improvements in the production of film and tubing of organic thermoplastic material
GB948937A (en) Method and apparatus for producing films of organic thermoplastic material having improved optical properties
GB1490454A (en) Translucent polypropylene film and process for producing the same
GB862966A (en) Making uniformly oriented polymer film
US2832994A (en) Accessory apparatus for making blown polystyrene film
US3304352A (en) Method for the extrusion of tubing
US3146284A (en) Process for making polypropylene film
US3207823A (en) Production of flattened tubular plastic film