GB941898A - - Google Patents
Info
- Publication number
- GB941898A GB941898A GB941898DA GB941898A GB 941898 A GB941898 A GB 941898A GB 941898D A GB941898D A GB 941898DA GB 941898 A GB941898 A GB 941898A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tubing
- point
- coated
- film
- melting
- 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
- 229920000098 polyolefin Polymers 0.000 abstract 13
- 239000011248 coating agent Substances 0.000 abstract 6
- 238000000576 coating method Methods 0.000 abstract 6
- 229920001169 thermoplastic Polymers 0.000 abstract 3
- 239000004416 thermosoftening plastic Substances 0.000 abstract 3
- 239000005977 Ethylene Substances 0.000 abstract 2
- 210000001138 Tears Anatomy 0.000 abstract 2
- 150000001336 alkenes Chemical class 0.000 abstract 2
- 229920001577 copolymer Polymers 0.000 abstract 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 2
- 238000001125 extrusion Methods 0.000 abstract 2
- 239000012530 fluid Substances 0.000 abstract 2
- 229920001519 homopolymer Polymers 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000000155 melt Substances 0.000 abstract 2
- 229920005606 polypropylene copolymer Polymers 0.000 abstract 2
- -1 propylene, ethylene Chemical group 0.000 abstract 2
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 abstract 2
- XTXRWKRVRITETP-UHFFFAOYSA-N vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 abstract 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 238000005660 chlorination reaction Methods 0.000 abstract 1
- 238000003851 corona treatment Methods 0.000 abstract 1
- 230000004059 degradation Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000002657 fibrous material Substances 0.000 abstract 1
- 229920001903 high density polyethylene Polymers 0.000 abstract 1
- 239000004700 high-density polyethylene Substances 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 229920001684 low density polyethylene Polymers 0.000 abstract 1
- 239000004702 low-density polyethylene Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract 1
- 239000004627 regenerated cellulose Substances 0.000 abstract 1
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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
Abstract
941,898. Polyolefin films; laminates and laminating. UNION CARBIDE CORPORATION. July 19, 1961 [July 21, 1960], No. 26080/61. Headings B5B and B5N. [Also in Division B2] A polyolefin film comprises a highly uniaxially oriented crystalline polyolefin film having a melting-point above 120 C., a density of at least 0.94 and a tensile strength of from 30,000 to 80,000 pounds per square inch. The film may be of a high density homopolymer of propylene, ethylene or butylene or a copolymer of said olefins with themselves, or a copolymer of propylene and ethylene with vinyl chloride or acetate. The film may be coated with a homopolymer of ethylene, propylene or butylene, or a copolymer of said olefins with themselves, or a copolymer of propylene or ethylene with vinyl chloride or acetate. The heat sealable coated film may be formed by continuously passing a seamless tubing of highly crystalline polyolefin 38 having a coating 40 of a polyolefin, having a melting-point lower than that of the tubing, bonded to at least one surface thereof, through a heated zone 48 maintained at a temperature below the melting point of the crystalline polyolefin but above the temperature at which it is drawable and above the melting- point of the coating but below its degradation point, to preserve the bond of the thermoplastic coating to the crystalline polyolefin tubing, while simultaneously introducing and maintaining in the tubing a bubble of a fluid medium, e.g. air, to prevent the tubing from collapsing, stretching the tubing at least 700% in the longitudinal direction to cause high orientation thereof in said direction, flattening the oriented tubing and recovering the coated film. The oriented tubing 38 may be coated with a polyolefin film having a melting-point lower than that of the oriented tubing by simultaneously extruding a second tubing 40 of the polyolefin having a lower melting-point, the second tubing being concentric to the oriented tubing and adhering thereto. The coated tubing may be formed by extruding a melt of the highly crystalline polyolefin through an annular orifice of die 14 to form a seamless tubing, simultaneously extruding therewith a melt of the thermoplastic coating material through a concentric annular orifice of die 14, whereby it is deposited on to the polyolefine tubing being co-extruded, continuously with drawing the coated tubing from the point of extrusion, e.g. by squeeze rolls 46, flattening the tubing, e.g. by rolls 50, at a point spaced from the extrusion point, a bubble of fluid medium being maintained under pressure in the tubing between these points to cause distension thereof, and passing the coated tubing through the heated zone and stretching as above. The coating may have a melting-point of less than 115 C., and a density of up to 0.93. The coated film may be used as a tear tape 58 comprising a crystalline polyolefin backing film 60 having a thermoplastic coating 62, applied internally to surface 68 (Fig. 5) or externally to surface 64 (Fig. 4), of a packing film 66 which may be of low or high density polyethylene, fibrous cellulose material, e.g. paper, or non- fibrous material, e.g. regenerated cellulose. As shown in Fig. 2, the tear tape 58 may be notched at 70 and strip 72 torn out between guides 74. Alternatively, the tape may have tab 76 as in Fig. 3. The coated or uncoated crystalline polyolefin film may be treated, e.g. flame, ozone, chlorination or corona discharge treatment, or metallized, before or after orientation, and may be coated with a pressure-sensitive adhesive or a magnetic layer.
Publications (1)
Publication Number | Publication Date |
---|---|
GB941898A true GB941898A (en) | 1900-01-01 |
Family
ID=1753931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB941898D Expired GB941898A (en) |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB941898A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2104817A1 (en) * | 1970-02-03 | 1971-08-12 | Fehrn Chnstensen, Vagn Christian Albert, Sempach (Schweiz) | Pressure sensitive adhesive tape |
DE2351923A1 (en) * | 1972-10-17 | 1974-04-18 | British Cellophane Ltd | HEAT SEALABLE POLYPROPYLENE FILM |
EP0052262A1 (en) * | 1980-11-03 | 1982-05-26 | Hoechst Aktiengesellschaft | Sealable biaxially oriented polypropylene film with high abrasion resistance, and method of making it |
-
0
- GB GB941898D patent/GB941898A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2104817A1 (en) * | 1970-02-03 | 1971-08-12 | Fehrn Chnstensen, Vagn Christian Albert, Sempach (Schweiz) | Pressure sensitive adhesive tape |
DE2351923A1 (en) * | 1972-10-17 | 1974-04-18 | British Cellophane Ltd | HEAT SEALABLE POLYPROPYLENE FILM |
EP0052262A1 (en) * | 1980-11-03 | 1982-05-26 | Hoechst Aktiengesellschaft | Sealable biaxially oriented polypropylene film with high abrasion resistance, and method of making it |
US4460631A (en) * | 1980-11-03 | 1984-07-17 | Hoechst Aktiengesellschaft | Sealable, biaxially stretched polypropylene film having high scratch resistance, and process for its manufacture |
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