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1. WO2000041872 - HEAT-SHRINKABLE, IRRADIATED, POLYETHYLENE MONO-LAYER FILM

Publication Number WO/2000/041872
Publication Date 20.07.2000
International Application No. PCT/EP2000/000127
International Filing Date 11.01.2000
Chapter 2 Demand Filed 19.04.2000
IPC
B29C 35/08 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
35Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
02Heating or curing, e.g. crosslinking or vulcanising
08by wave energy or particle radiation
B29C 55/12 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
55Shaping by stretching, e.g. drawing through a die; Apparatus therefor
02of plates or sheets
10multiaxial
12biaxial
CPC
B29C 35/08
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
35Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
02Heating or curing, e.g. crosslinking or vulcanizing ; during moulding, e.g. in a mould
08by wave energy or particle radiation
B29C 55/12
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
55Shaping by stretching, e.g. drawing through a die; Apparatus therefor
02of plates or sheets
10multiaxial
12biaxial
B29K 2023/0625
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2023Use of polyalkenes ; or derivatives thereof; as moulding material
04Polymers of ethylene
06PE, i.e. polyethylene
0608characterised by its density
0625LLDPE, i.e. linear low density polyethylene
Applicants
  • CRYOVAC, INC. [US/US]; 100 Rogers Bridge Road Duncan, SC 29334, US (AllExceptUS)
  • FORLONI, Roberto [IT/IT]; IT (UsOnly)
Inventors
  • FORLONI, Roberto; IT
Agents
  • DE CARLI, Elda; Cryovac S.p.A. Via Trento, 7 I-20017 Passirana Di Rho, IT
Priority Data
99100787.318.01.1999EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) HEAT-SHRINKABLE, IRRADIATED, POLYETHYLENE MONO-LAYER FILM
(FR) PELLICULE DE POLYETHYLENE, MONOCOUCHE, THERMORETRACTABLE, SOUMISE A UN RAYONNEMENT
Abstract
(EN)
A process of manufacturing a heat-shrinkable polyethylene mono-layer film with a thickness variation of less than 20 %, preferably less than 18 % and even more preferably less than 15 %, which process comprises extrusion of the film resin through a flat die, quenching of the cast extruded sheet, irradiation thereof, re-heating to the suitably selected orientation temperture and stretching of the irradiated sheet. Preferably the polyethylene comprises an ethylene-α-olefin copolymer. The heat-shrinkable polyethylene mono-layer irradiated film with a thickness variation of less than 20 %, preferably less than 18 % and even more preferably less than 15 % is also claimed.
(FR)
L'invention concerne un procédé de fabrication d'une pellicule de polyéthylène, monocouche, thermorétractable, dont la variation en épaisseur est inférieure à 20 %, de préférence inférieure à 18 % et idéalement inférieure à 15 %. Ce procédé comprend les étapes consistant à extruder la résine de la pellicule à travers une filière plate, à refroidir rapidement la feuille extrudée moulée, à la soumettre à un rayonnement, puis à la chauffer à nouveau jusqu'à une température d'étirage correctement choisie, et à étirer la feuille ayant subi le rayonnement. De préférence, le polyéthylène comprend un copolymère d'éthylène-$g(a)-oléfine. L'invention concerne encore une pellicule de polyéthylène, monocouche, thermorétractable, soumise à un rayonnement, et dont la variation en épaisseur est inférieure à 20 %, de préférence inférieure à 18 % et idéalement inférieure à 15 %.
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