GB2024715A - Process for the preparation of thermoweldable polyolefinic films - Google Patents

Process for the preparation of thermoweldable polyolefinic films Download PDF

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Publication number
GB2024715A
GB2024715A GB7924046A GB7924046A GB2024715A GB 2024715 A GB2024715 A GB 2024715A GB 7924046 A GB7924046 A GB 7924046A GB 7924046 A GB7924046 A GB 7924046A GB 2024715 A GB2024715 A GB 2024715A
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film
base film
preparation
coating
copolymer
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GB2024715B (en
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Moplefan SpA
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Moplefan SpA
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of 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
    • 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
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
    • 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
    • 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
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • B29C55/026—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets of preformed plates or sheets coated with a solution, a dispersion or a melt of thermoplastic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Materials Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Non-fibrillating thermo-weldable films are made from two layers of the same polyolefinic material, following a sequence of operations essentially comprising the extrusion of a base film, cooling and longitudinally stretching it under defined conditions, extruding a relatively thin coating of the same polyolefinic material onto the base film and then transversely stretching the composite film under defined conditions. Typically, an extruded film of isotactic polypropylene is cooled to 40 DEG C., stretched 1:5. coated at a base/ coat ratio of 8:1 and stretched transversely 1:8. The polyolefinic material should be a crystalline alpha-olefine polymer or copolymer or a mixture of such. <IMAGE>

Description

SPECIFICATION Process for the preparation of thermoweldable polyolefinic films The present invention concerns a method for the preparation of thermoweldable, non-fibrilling polyolefine films obtained from a single type of olefinic polymer or copolymer or from mixtures thereof, by the combination of a plurality of successive extrusions and suitable drawing operations.
It is an object of the invention to provide, in a convenient manner, films suitable for the manufacture of containers, covers, small bags, vessels and in general manufactured articles intended for the packaging industry.
As is known, materials intended for packaging should possess a combination of characteristics, both mechanical as well as aesthetic, and in particular impermeability to gases and vapours, of thermoweldability, transparency and brightness and many other characteristics that are difficult to establish simultaneously in films obtained from a single type of polymer. Thus, recourse is made to the use of laminated sheets and coated films obtained by combining polymers of different types.
There are also known and described in various of our patents, laminated and bonded films comprising polyolefinic films and films of othertheroplastic polymers or metal foils, in particular of aluminium.
There are also known bonded sheets obtained from non-stretched polyolefinic films and from films of other thermoplastic polymers which are successively stretched, and also films obtained by the extrusion of olefinic polymers onto films of other thermoplastic polymers.
It has now been found that it is possible to obtain thermoweldable and non-fibrilling polyolefinic films by a process which involves extruding on a polyolefine base film a polyolefine composition which is the same as that of the base film and effecting certain suitable stretch operations.
Thus, the process of the invention permits the use of the same polymer composition both for the preparation of the base film and for its coating.
The invention consists in a process for the preparation of thermoweldable and non-fibrilling polyolefinic films which comprises: (a) preparing a mono-oriented base film by extrusion of a crystalline alpha-olefine polymer or copolymer or of a mixture thereof, cooling the film at 1000 - 700C and subsequently longitudinally stretching it at 11000 15000 with a stretch ratio in the range 1: 4 to 1: 7; (b) extruding, onto one or both faces of the base film, a coating of the same polymer or copolymer or mixture used in the preparation of the base film, so that the thickness of the coating layer is from 1/6 to 1/10 of the thickness of the base film; and (c) cross-stretching the coated film at a temperature of 1 200c to 16000, using a stretch ratio in the range 1 :6to1 1 : 10.
The polymers or copolymers or mixtures thereof suitable for use in the process of this invention both for the preparation of the base film and for its coating, are the crystalline polymers or copolymers of alpha-olefines, these generally being prepared with stereospecific catalysts. In particular, polypropylene having macro-molecules which are prevailingly isotactic, and crystalline propylene-ethylene copolymers prevailingly containing propylene units, both of the block as well as of the random type, as well as polyethylene/polypropylene, polyethylene/crystalline propylene-ethylene copolymer, polypropylene/crystalline propylene-ethylene copolymer mixtures may be used.
The polymers and polymeric mixtures may be compounded with dulling agents, stabilizers, lubricants, fillers, and/or organic and inorganic pigments.
Preferably there are used polymers or polymeric mixtures with a melt index in the range 0.1 to 30.
The polyolefinic films obtainable by the process of this invention show good characteristics of thermoweldability, and good mechanical and aesthetic characteristics; they are non-fibrilling and display good resistance to sticking to the welding bars of automatic or semi-automatic machines used for the manufacture of containers, envelopes, small bags, vessels and in general articles intended for the packaging industry.
The accompanying drawing shows in diagramatic form an example of apparatus suitable for carrying out the process of this invention.
The drawing depicts an extruder (1 ) for the extrusion of the base film, a cooling unit (2), a pre-heating unit (3), a longitudinal stretching unit (4), the extrusion devices (5) for applying the olefine polymer on one or both faces of the base film, and the transverse or cross stretching unit (6).
The measurement of the adhesion of the film to welding bars was made by measuring with an Instron dynamometer the force per surface unit (g/cm2) necessary for the detachment, from the welding elements, of a specimen connected to the dynamometer and subjected to welding under conditions similar to those of packaging machines normally used (temperatures between 13000 and 150 C, pressure 40 psi, time 1 second).
The fibrillability was evaluated by inspection with an optical microscope, after elongation on the Instron dynamometer.
The resistance of the weld was evaluated at 135"C - 15000, with an Instron dynamometer, on superimposed and welded samples, under knurled bars, with a Sentinel type welder, for 1 second, under a pressure of 40 psi.
The following examples illustrate how the invention may be carried into effect without limiting the wider aspects thereof.
EXAMPLE 1 Athermoweldable and notfibrilling polypropylene film was prepared by film extrusion of a crystalline polypropylene having prevailingly isotactic macromolecules, having a melt-index of 1, a residue from the heptane extraction of 97.2%, and an ash residue of 100 ppm, prepared by stereospecific polymerization of propylene. The precedure is schematically represented in the accompanying drawing.
The production of the film is achieved by the following successive operations: (a) preparation of the unstretched film by extrusion of the polypropylene; (b) cooling down on rollers, to 4000; (c) longitudinal stretching, at 140 C, with a stretch ratio of 1: 5; (d) extrusion of polypropylene having the same characteristics as the base film, onto the mono-stretched film using a base film/coating film ratio of 8:1; (e) transverse stretching at 155 C, at a stretch ratio of 1: 8; (f) winding up.
The coated film thus obtained had the following characteristics: - thickness of coating (in microns) 3 - breaking load (kg/sq cm) transverse 2,800 longitudinal 1,300 - elongation (%) transverse 45 longitudinal 180 - adhesion (scotch-tape test) (%) 100 - blocking at 43 C (ASTM D-1146/53) 200 -transparency (ASTM D-1003/59T) 2 - glidability (static friction coefficient TMI) 0.5 - resistance of weld (g/cm) at 145 C 70 art 150'0 250 -fibrillability none - adhesion to welding bars at 130 C 0 at 140 C 0 art 150'0 0 EXAMPLE2 There was prepared a thermoweldable and non-fibrilling polypropylene film, by film extruding a crystalline polypropyline with prevailingly isotactic macromolecules having a melt-index of 2, a residue from the heptane extraction of 97.2%, and an ash residue of 100 ppm, prepared by stereospecific polymerization of propylene, the film being made by using the device schematically illustrated in the accompanying drawing.
The preparation of the film was achieved by the following successive operations: (a) preparation of a non-stretched film by extrusion of the polypropylene; (b) cooling on rollers, at 4000; (c) stretching in a longitudinal direction at 140 C, with a stretch ratio of 1: 5; (d) extrusion of polypropylene having the same characteristics as the base film, onto the mono-stretched film, using a base film/coating film ratio of 8:1; (e) transverse stretching, at 155 C, at a stretch ratio of 1: 8; (f) winding up.
The so-obtained coated film had the following characteristics: - thickness of coating (in microns) 3 - breaking load (kg/sq cm) transverse 2,800 longitudinal 1,300 - elongation (%) transverse 45 longitudinal 180 - adhesion (scotch-tape test) (%) 100 - blocking at43'C (ASTM D-1146/53) 200 -transparency (ASTM D-1003/59T) 2 - glidability (coefficient of static friction TMI) 0.5 - resistance of weld (g/cm) at 145 C 70 at 150 C 250 - fibrillability none - adhesion to welding bars at 1300C 0 at 140 C 0 at 150 C 0 EXAMPLE 3 There was prepared a thermoweldable and non-fibrilling polypropylene film, by film-extruding a crystalline polypropylene with prevailingly isotactic macromolecules, having a melt-index of 10, a residue from heptane extraction of 95%, and an ash residue of 100 ppm, prepared by stereospecific polymerization of propylene and by using the device schematically illustrated in the accompanying drawing.
The preparation of the film was achieved by the following successive operations: (a) preparation of an unstretched film by extrusion of polypropylene; (b) cooling on rollers at4000; (c) longitudinal stretching, at 140 C, at a stretch ratio of 1: 5; (d) extrusion of polypropylene, of the same characteristics of that of the base film, onto the mono-stretched film, using the base film/coating film ratio of 8:1; (e) transverse stretching at 155 C, at a stretch ratio of 1: 8; (f) winding up.
The so-obtained coated film had the following characteristics: - thickness of the coating (microns) 3 - breaking load (kg/sq cm) transverse 2,600 longitudinal 1,200 - elongation (%) transverse 50 longitudinal 190 - adhesion (scotch-tape test) (%) 100 - blocking art4300 (ASTM D-1146/53) 200 - transparency (ASTM D-1003/59T) 2 - glidability (static friction coefficient TMl) 0.5 - resistance of weld (g/cm) at 140'0 50 at 145'0 100 art 150'0 250 -fibrillability none - adhesion to welding bars: at 13000 0 art 140'0 0 at 1500 0 EXAMPLE 4 A thermoweldable and non-fibrilling polypropylene film was prepared by film-extruding a crystalline polypropylene with prevailingly isotactic macromolecules, having a melt-index of 20, a residue from heptane extraction of 90%, an ash residue of 100 ppm, prepared by stereospecific polymerization of propylene, the film having been made by using the device schematically illustrated in the accompanying drawing.
The preparation of the film was achieved by means of the following successive operations: (a) preparation of an unstretched polypropylene film by extrusion; (b) cooling on rollers at4000; (c) longitudinal stretching, at 1400C, at a stretch ratio of 1: 5; (d) extrusion of polypropylene, of the same characteristics as that of the base film, onto the mono-stretched film, using a base film/coating film ratio of 8:1; (e) transverse stretching at 155 C, at a stretch ratio of 1: 8; (f) winding up.
The so-obtained coated film had the following characteristics: - thickness of the coating (in microns) 3 - breaking load (kg/sq cm) transverse 2,600 longitudinal 1,200 - elongation (%) transverse 50 longitudinal 190 - adhesion (scotch-tape test) (%) 100 - blocking art4300 (ASTM D-1146/53) 200 - transparency (ASTM D-1103/59T) 2 - glidability (static friction coefficient TMI) 0.5 - resistance of weld (g/cm) at 1400C 50 at 145'0 250 art 150'0 300 -fibrillability none - adhesion to welding bars:: lt 1300 0 art 140'0 0 art 150'0 O EXAMPLE 5 Athermoweldable and non-fibrilling polyolefine film was prepared by film-extruding a random propylene-ethylene copolymer, having a melt-index of 8; an ash residue of 78 ppm, and an ethylene content of 2.7%, prepared by copolymerization of the propylene/ethylene by means of a stereospecific catalyst, the film having been made by using the device schematically illustrated in the accompanying drawing.
The preparation of the film was achieved by means of the following successive operations: (a) preparation of the unstretched film by extrusion of the copolymer; (b) cooling on rollers, at40'0; (c) longitudinal stretching, at 125 C, with a stretch ratio of 1: 5; (d) extrusion of a copolymer having the same characteristics of that of the base film, onto the mono-stretched film, at a base film/coating film ratio of 8:1; (e) transverse stretching, at 145 C, at a stretch ratio of 1: 8; (f) winding up.
The so-obtained coated film had the following characteristics: - thickness of the coating (microns) 3 - breaking load (kg/sq cm) transverse 2,300 longitudinal 1,000 - elongation (%) transverse 50 longitudinal 210 - adhesion (scotch-tape test) (%) 100 - blocking art4300 (ASTM D-1146/53) 250 -transparency (ASTM D-1003/59T) 4 - glidability (static friction coefficient TMI) 0.5 - resistance of weld (g/cm) at 135"C 200 art 140'0 300 at 14500 300 at 15000 300 - fibrillability none - adhesion to welding bars: at 130 C 0 art 140'0 0

Claims (5)

1. A process for the preparation of thermoweldable, non-fibrilling polyolefine films which comprises: (a) preparing a mono-oriented base film by extruding a crystalline alpha-olefine polymer or copolymer or a mixture thereof, cooling the film at 1 ODC - 70 C, and subsequently longitudinally stretching it at 110 C 150 C with a stretch ratio in the range 1: 4 to 1: 7; (b) extruding, onto one or both faces of the base film, a coating of the same polymer or copolymer or mixture used in the preparation of the base film, so that the thickness of the coating is from 1/6 to 1/10 of the thickness of the base film; and (c) cross-stretching the coating film at a temperature 120'Cto 160 C, using a stretch ratio in the range 1: 6 to 1 : 10.
2. A process according to claim 1, in which for the preparation of the base film and for coating the same there is used a polymeric material selected from: isotactic polypropylene, propylene-ethylene crystalline copolymers with a predominant content of propylene, of the block copolymer or the random copolymer type, polyethylene-crystalline polypropylene mixtures, polyethylene/crystalline propylene-ethylene copolymers and polypropylene/crystaline propylene-copolymer mixtures.
3. A process according claim 1 or 2 in which the polymeric material used has a melt-index of 0.1 to 30.
4. A process according to claim 1, substantially as described in any of the foregoing examples.
5. Thermoweldable, non-fibrilling polyolefine films when prepared by a process as set forth in any of the foregoing claims.
GB7924046A 1978-07-10 1979-07-10 Process for the preparation of thermoweldable polyolefinic films Expired GB2024715B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7825477A IT1097510B (en) 1978-07-10 1978-07-10 PROCEDURE FOR THE PREPARATION OF THERMAL SEALABLE POLYOLEFINIC FILMS

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GB2024715A true GB2024715A (en) 1980-01-16
GB2024715B GB2024715B (en) 1982-07-21

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JP (1) JPS5514299A (en)
AT (1) ATA477579A (en)
BE (1) BE877592A (en)
DE (1) DE2927633A1 (en)
DK (1) DK286179A (en)
ES (1) ES482328A1 (en)
FR (1) FR2430836A1 (en)
GB (1) GB2024715B (en)
IT (1) IT1097510B (en)
NL (1) NL7905317A (en)
NO (1) NO792259L (en)
SE (1) SE7905937L (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038108A2 (en) * 1980-01-25 1981-10-21 Mobil Oil Corporation Thermoplastic packaging films with improved heat-seal characteristics
EP0044544A1 (en) * 1980-07-22 1982-01-27 Toray Industries, Inc. Adhesive tape
EP0074194A2 (en) * 1981-08-22 1983-03-16 Showa Denko Kabushiki Kaisha Propylene-ethylene random copolymer, production process thereof, and film derived therefrom
FR2603522A1 (en) * 1986-09-08 1988-03-11 Silec Liaisons Elec FLEXIBLE TUBE WITH REDUCED LINEAR EXPANSION COEFFICIENT, MANUFACTURING METHOD THEREOF, AND APPARATUS USING THE SAME
US6939584B2 (en) 2001-01-25 2005-09-06 Stephen William Sankey Process for the production of coated polymeric film
WO2007093798A1 (en) 2006-02-17 2007-08-23 Dupont Teijin Films U.S. Limited Partnership Polyester film
US7939147B2 (en) 2002-01-25 2011-05-10 Dupont Teijin Films U.S. Limited Partnership Heat-sealable and shrinkable multi-layer polymeric film
US8197925B2 (en) 2003-07-16 2012-06-12 Dupont Teijin Films U.S. Limited Partnership Self-venting polymeric film
CN110350155A (en) * 2018-04-04 2019-10-18 北京师范大学 A kind of composite micro porous film of the nanometer fibrous porous layer of the orientation containing transversely draw direction
WO2021074240A1 (en) * 2019-10-15 2021-04-22 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Process and film-drawing unit for producing sealable biaxially oriented polyester-based film
WO2021140444A1 (en) 2020-01-06 2021-07-15 Dupont Teijin Films U.S. Limited Partnership Polymeric film tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323018A1 (en) * 1983-06-25 1985-01-10 Beiersdorf Ag, 2000 Hamburg DUCT TAPE
DE102016215730A1 (en) * 2016-08-23 2018-03-01 Contitech Antriebssysteme Gmbh Method for the multi-stage production of a tensile or suspension means

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805886A1 (en) * 1967-11-04 1969-09-04 Mitsubishi Petrochemical Co Heat sealable biaxially oriented polypropylene sheet films and methods of making them
DE1769028A1 (en) * 1968-03-22 1972-02-03 Kalle Ag Biaxially oriented polypropylene film
DE2637978B2 (en) * 1976-08-24 1979-10-25 Hoechst Ag, 6000 Frankfurt Heat-sealable plastic film and process for its production

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038108A3 (en) * 1980-01-25 1983-01-05 Mobil Oil Corporation Thermoplastic packaging films with improved heat-seal characteristics
EP0038108A2 (en) * 1980-01-25 1981-10-21 Mobil Oil Corporation Thermoplastic packaging films with improved heat-seal characteristics
EP0044544A1 (en) * 1980-07-22 1982-01-27 Toray Industries, Inc. Adhesive tape
EP0074194A2 (en) * 1981-08-22 1983-03-16 Showa Denko Kabushiki Kaisha Propylene-ethylene random copolymer, production process thereof, and film derived therefrom
EP0074194A3 (en) * 1981-08-22 1983-11-30 Showa Denko K.K. Propylene-ethylene random copolymer, production process thereof, and film derived therefrom
FR2603522A1 (en) * 1986-09-08 1988-03-11 Silec Liaisons Elec FLEXIBLE TUBE WITH REDUCED LINEAR EXPANSION COEFFICIENT, MANUFACTURING METHOD THEREOF, AND APPARATUS USING THE SAME
EP0263728A1 (en) * 1986-09-08 1988-04-13 Societe Industrielle De Liaisons Electriques - Silec Hose with a reduced linear expansion coefficient, its manufacturing process and apparatus for using it
US7368165B2 (en) 2001-01-25 2008-05-06 Dupont Teijin Films U.S. Limited Partnership Process for the production of coated polymeric film
US6939584B2 (en) 2001-01-25 2005-09-06 Stephen William Sankey Process for the production of coated polymeric film
US7939147B2 (en) 2002-01-25 2011-05-10 Dupont Teijin Films U.S. Limited Partnership Heat-sealable and shrinkable multi-layer polymeric film
US8394470B2 (en) 2002-01-25 2013-03-12 Dupont Teijin Films U.S. Limited Partnership Heat-sealable and shrinkable multi-layer polymeric film
US8197925B2 (en) 2003-07-16 2012-06-12 Dupont Teijin Films U.S. Limited Partnership Self-venting polymeric film
US8586159B2 (en) 2003-07-16 2013-11-19 Dupont Teijin Films U.S. Limited Partnership Self-venting polymeric film
WO2007093798A1 (en) 2006-02-17 2007-08-23 Dupont Teijin Films U.S. Limited Partnership Polyester film
EP2431177A1 (en) 2006-02-17 2012-03-21 DuPont Teijin Films U.S. Limited Partnership Polyester film
EP2431176A1 (en) 2006-02-17 2012-03-21 DuPont Teijin Films U.S. Limited Partnership Polyester film
US8202612B2 (en) 2006-02-17 2012-06-19 Dupont Teijin Films U.S. Limited Partnership Polyester film
CN110350155A (en) * 2018-04-04 2019-10-18 北京师范大学 A kind of composite micro porous film of the nanometer fibrous porous layer of the orientation containing transversely draw direction
WO2021074240A1 (en) * 2019-10-15 2021-04-22 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Process and film-drawing unit for producing sealable biaxially oriented polyester-based film
CN114514106A (en) * 2019-10-15 2022-05-17 林道尔·多尼尔有限责任公司 Method for producing sealable biaxially oriented polyester-based film and film stretching device
WO2021140444A1 (en) 2020-01-06 2021-07-15 Dupont Teijin Films U.S. Limited Partnership Polymeric film tube

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FR2430836A1 (en) 1980-02-08
ATA477579A (en) 1983-05-15
JPS5514299A (en) 1980-01-31
GB2024715B (en) 1982-07-21
FR2430836B1 (en) 1983-04-01
IT1097510B (en) 1985-08-31
ES482328A1 (en) 1980-08-16
BE877592A (en) 1980-01-09
SE7905937L (en) 1980-01-11
DK286179A (en) 1980-01-11
NO792259L (en) 1980-01-11
IT7825477A0 (en) 1978-07-10
NL7905317A (en) 1980-01-14
DE2927633A1 (en) 1980-01-31

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