GB836542A - Improvements in the production of oriented shaped structures such as films and artificial filaments - Google Patents

Improvements in the production of oriented shaped structures such as films and artificial filaments

Info

Publication number
GB836542A
GB836542A GB33981/58A GB3398158A GB836542A GB 836542 A GB836542 A GB 836542A GB 33981/58 A GB33981/58 A GB 33981/58A GB 3398158 A GB3398158 A GB 3398158A GB 836542 A GB836542 A GB 836542A
Authority
GB
United Kingdom
Prior art keywords
temperature
polyolefine
crystalline
crystalline melting
product
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
GB33981/58A
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.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB836542A publication Critical patent/GB836542A/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
    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • 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
    • B29C48/03—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
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Textile Engineering (AREA)
  • Artificial Filaments (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Normally crystalline polyolefine films, filaments and like products are oriented by heatng the product to a temperature at least 10 DEG C. above the crystalline melting temperature of the polyolefine, cooling the product to a temperature below, but not more than 12 DEG C. below, the crystalline melting temperature and almost immediately stretching the product in at least one direction while maintaining its temperature between the crystalline melting temperature of the polyolefine and a temperature 12 DEG C. below, preferably at a temperature 5-12 DEG C. below, the crystalline melting temperature. The product may be formed by extrusion at a temperature at least 10 DEG C. above the crystalline melting-point of the polyolefine, and may be kept at the extrusion temperature up to the time it is cooled to within 12 DEG C. below the crystalline melting-point. The crystalline melting-point is defined as the lowest temperature at which complete disappearance of the crystalline structure of the polymer is observed under a visible light microscope using polarized light when the crystalline product is heated at a rate of about 2 DEG C. per minute under the microscope. Crystalline polyolefine is defined as a polyolefine which exhibits at least 10% crystallinity at room temperature as determined from X-ray diffraction patterns. The method of carrying out the determination is described. The polyolefine may be polyethylene, particularly high-density polyethylene, polypropylene, polystyrene, polyisopropylethylene or polyisobutylethylene. The product is stretched by at least 1.5 times its initial length in the direction of stretch, and is then advantageously cooled, preferably to a temperature below 75 DEG C., while maintaining sufficient tension on it to prevent shrinkage, the tension thereafter being released. Films are preferably stretched in two mutually perpendicular directions, preferably simultaneously. In an example, a film having a crystalline melting-point of 128 DEG C. and formed by melt-extruding a polyethylene having, when annealed, a crystallinity of 87% and a density of 0.95, is heated to 138 DEG C. and then cooled to 119 DEG C., at which temperature it is stretched simultaneously at a ratio of 2.3 in the longitudinal direction and 2.2 in the transverse direction; finally, it is cooled to 50-60 DEG C. under sufficient tension to prevent shrinkage. Films stretched as described above are improved with respect to durability, tensil strength, stiffness and transparency and are particularly suitable for packaging. Specification 741,962 is referred to.
GB33981/58A 1957-10-31 1958-10-23 Improvements in the production of oriented shaped structures such as films and artificial filaments Expired GB836542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US836542XA 1957-10-31 1957-10-31

Publications (1)

Publication Number Publication Date
GB836542A true GB836542A (en) 1960-06-01

Family

ID=22179811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33981/58A Expired GB836542A (en) 1957-10-31 1958-10-23 Improvements in the production of oriented shaped structures such as films and artificial filaments

Country Status (4)

Country Link
BE (1) BE572425A (en)
DE (1) DE1108898B (en)
FR (1) FR1211161A (en)
GB (1) GB836542A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086242A (en) * 1960-07-15 1963-04-23 Raychem Corp Process and apparatus for producing materials having plastic memory
US3159449A (en) * 1960-11-25 1964-12-01 Herculcs Powder Company Modified stereo regulated polyolefin filamentary articles and process for producing such articles
US6174479B1 (en) * 1996-09-30 2001-01-16 Solvay (Societe Anonyme) Process for processing a semicrystalline thermoplastic

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265769A (en) * 1961-10-09 1966-08-09 Minnesota Mining & Mfg Biaxially oriented polypropylene film containing butyl rubber
US3144430A (en) * 1961-10-09 1964-08-11 Minnesota Mining & Mfg Polypropylene film and method of making

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086242A (en) * 1960-07-15 1963-04-23 Raychem Corp Process and apparatus for producing materials having plastic memory
US3159449A (en) * 1960-11-25 1964-12-01 Herculcs Powder Company Modified stereo regulated polyolefin filamentary articles and process for producing such articles
US6174479B1 (en) * 1996-09-30 2001-01-16 Solvay (Societe Anonyme) Process for processing a semicrystalline thermoplastic

Also Published As

Publication number Publication date
BE572425A (en) 1900-01-01
DE1108898B (en) 1961-06-15
FR1211161A (en) 1960-03-14

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