GB2045677A - Ribbed polyethylene film - Google Patents

Ribbed polyethylene film Download PDF

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Publication number
GB2045677A
GB2045677A GB8004893A GB8004893A GB2045677A GB 2045677 A GB2045677 A GB 2045677A GB 8004893 A GB8004893 A GB 8004893A GB 8004893 A GB8004893 A GB 8004893A GB 2045677 A GB2045677 A GB 2045677A
Authority
GB
United Kingdom
Prior art keywords
film
polyethylene film
extruded
spaced apart
extruder
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.)
Withdrawn
Application number
GB8004893A
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.)
Paclene Co Ltd
Original Assignee
Paclene Co Ltd
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 Paclene Co Ltd filed Critical Paclene Co Ltd
Publication of GB2045677A publication Critical patent/GB2045677A/en
Withdrawn legal-status Critical Current

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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
    • B29C48/25—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
    • 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
    • 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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/003—Tubular articles having irregular or rough surfaces

Abstract

An extruded tube of high molecular weight high density polyethylene film is formed with a plurality of equally spaced apart ribs 11 and the film intermediate the ribs 11 is slightly stretched. The ribbed film 10 is formed using an extrusion die 12 of circular cross-section having at the in-use top end thereof a plurality of spaced apart fine cut grooves 13. <IMAGE>

Description

SPECIFICATION Polythene film This invention relates to a high molecular weight high density polyethylene film which, inter alia, is suitable for the production of carrier bags.
The present invention provides an extruded high molecular weight high density polyethylene film having imparted thereto by the extrusion process a series of spaced apart ribs which gives to the film a ribbed configuration.
Preferably the ribs are spaced apart with a regular pitch. The ribbed configuration imparts to the film of polyethylene material an appearance and feel similar to that associated with a high quality paper product for use in the packaging industry.
The invention also provides an apparatus for the production of the extruded high molecular weight high density film, the apparatus comprising a polyethylene film extruder, for example a conventional Reifinhauser machine or an ALPINE (Trade Mark) machine, provided with an extrusion die having, in its in use position, at the top end thereof a plurality of narrow spaced apart grooves extending in the direction of extrusion.
The invention will be understood from the following description of an embodiment thereof given by way of example only with reference to the accompanying drawings in which: Figure 1 is a perspective view of part of an extruded tube of high molecular weight high density polyethylene film according to an embodiment of the present invention; Figure 2 is a detail of a small portion of the film illustrated in Fig. 1; Figure 3 is a perspective view of an extrusion die for use in the production of the above polyethylene film; Figure 4 is a plan view of the extrusion die; and Figure 5 is a detail view of outlined portion A of Fig. 4.
Referring to Figs. 1 and 2 of the accompanying drawings an extruded tube of high molecular weight high density polyethylene film 10 is provided with a plurality of equally spaced apart ribs 11. The film intermediate the ribs 11 has a slightly stretched or contoured appearance which enhances the ribbed configuration of the extruded film 10 to give the extruded film 10 an appearance similar to a high quality packaging paper.
The high molecular high density polyethylene film 10 may be produced using a Reifinhauser polyethylene film extruder, the extruder being fitted with an extrusion die as illustrated in Figs. 3, 4 and 5 of the accompanying drawings. The extruder die 12 is circular in cross-section and is provided at the inuse top end thereof with a plurality of spaced apart fine cut grooves 13. The diameter of the die at the top end thereof is 60 mm and the narrow grooves 13 are provided, to a groove length of about 13 mm, around the circumferential surface of the die. The die 12 has an overall depth of 83 mm. Each groove 13 is 0.025 mm wide and 13 mm in length and has a groove depth of 1.00 mm. These dimensions are indicated in Figs. 3 and 5.
The manner of production of the film is otherwise conventional. The extruder used can handle some 40-90 kilos/hour of material, the material rate/hour being determined by the extruded film thickness required. The number of grooves 13 provided on the extrusion die 12 is one factor which determines the rib pitch on the extruded film. A second factor which determines the rib pitch is the rate of material/hour through the extruder, i.e., the film size and thickness blown at the time. A normal gauge extruded polyethylene film, suitable for the production of carrier bags of the kind at present used in quality supermarkets, would have a rib pitch in the range 5-7 mm.
It is to be clearly understood that the actual extrusion process employed is conventional and further except for the new extrusion die employed the extruder used to produce the film is also conventional both in its construction and manner of operation.
1. An extruded high molecular weight high density polyethylene film having imparted thereto by the extrusion process a series of spaced apart ribs which gives to the film a ribbed configuration.
2. A polyethylene film as claimed in Claim 1, wherein the film is in the form of a tube.
3. A polyethylene film as claimed in Claim 1 or 2, wherein the the ribs are spaced apart with a regular pitch.
4. A polyethylene film as claimed in Claim 3, wherein the rib pitch is 5 to 7 mm.
5. An apparatus for producing film as claimed in Claim 1, comprising a polyethylene film extruder provided with an extrusion die having at its top end a plurality of narrow spaced apart grooves extending in the direction of extrusion.
6. An apparatus as claimed in Claim 5 wherein the top end of the die is circular in cross-section.
7. An extruded polyethylene film substantially as described with reference to Figs. 1 and 2 of the accompanying drawings.
8. An apparatus for producing polyethylene film comprising a polyethylene film extruder provided with an extrusion die substantially as described with reference to Figs. 3, 4 and 5 of the accompanying drawings.
9. A polyethylene film made using the apparatus of Claim 8.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Polythene film This invention relates to a high molecular weight high density polyethylene film which, inter alia, is suitable for the production of carrier bags. The present invention provides an extruded high molecular weight high density polyethylene film having imparted thereto by the extrusion process a series of spaced apart ribs which gives to the film a ribbed configuration. Preferably the ribs are spaced apart with a regular pitch. The ribbed configuration imparts to the film of polyethylene material an appearance and feel similar to that associated with a high quality paper product for use in the packaging industry. The invention also provides an apparatus for the production of the extruded high molecular weight high density film, the apparatus comprising a polyethylene film extruder, for example a conventional Reifinhauser machine or an ALPINE (Trade Mark) machine, provided with an extrusion die having, in its in use position, at the top end thereof a plurality of narrow spaced apart grooves extending in the direction of extrusion. The invention will be understood from the following description of an embodiment thereof given by way of example only with reference to the accompanying drawings in which: Figure 1 is a perspective view of part of an extruded tube of high molecular weight high density polyethylene film according to an embodiment of the present invention; Figure 2 is a detail of a small portion of the film illustrated in Fig. 1; Figure 3 is a perspective view of an extrusion die for use in the production of the above polyethylene film; Figure 4 is a plan view of the extrusion die; and Figure 5 is a detail view of outlined portion A of Fig. 4. Referring to Figs. 1 and 2 of the accompanying drawings an extruded tube of high molecular weight high density polyethylene film 10 is provided with a plurality of equally spaced apart ribs 11. The film intermediate the ribs 11 has a slightly stretched or contoured appearance which enhances the ribbed configuration of the extruded film 10 to give the extruded film 10 an appearance similar to a high quality packaging paper. The high molecular high density polyethylene film 10 may be produced using a Reifinhauser polyethylene film extruder, the extruder being fitted with an extrusion die as illustrated in Figs. 3, 4 and 5 of the accompanying drawings. The extruder die 12 is circular in cross-section and is provided at the inuse top end thereof with a plurality of spaced apart fine cut grooves 13. The diameter of the die at the top end thereof is 60 mm and the narrow grooves 13 are provided, to a groove length of about 13 mm, around the circumferential surface of the die. The die 12 has an overall depth of 83 mm. Each groove 13 is 0.025 mm wide and 13 mm in length and has a groove depth of 1.00 mm. These dimensions are indicated in Figs. 3 and 5. The manner of production of the film is otherwise conventional. The extruder used can handle some 40-90 kilos/hour of material, the material rate/hour being determined by the extruded film thickness required. The number of grooves 13 provided on the extrusion die 12 is one factor which determines the rib pitch on the extruded film. A second factor which determines the rib pitch is the rate of material/hour through the extruder, i.e., the film size and thickness blown at the time. A normal gauge extruded polyethylene film, suitable for the production of carrier bags of the kind at present used in quality supermarkets, would have a rib pitch in the range 5-7 mm. It is to be clearly understood that the actual extrusion process employed is conventional and further except for the new extrusion die employed the extruder used to produce the film is also conventional both in its construction and manner of operation. CLAIMS
1. An extruded high molecular weight high density polyethylene film having imparted thereto by the extrusion process a series of spaced apart ribs which gives to the film a ribbed configuration.
2. A polyethylene film as claimed in Claim 1, wherein the film is in the form of a tube.
3. A polyethylene film as claimed in Claim 1 or 2, wherein the the ribs are spaced apart with a regular pitch.
4. A polyethylene film as claimed in Claim 3, wherein the rib pitch is 5 to 7 mm.
5. An apparatus for producing film as claimed in Claim 1, comprising a polyethylene film extruder provided with an extrusion die having at its top end a plurality of narrow spaced apart grooves extending in the direction of extrusion.
6. An apparatus as claimed in Claim 5 wherein the top end of the die is circular in cross-section.
7. An extruded polyethylene film substantially as described with reference to Figs. 1 and 2 of the accompanying drawings.
8. An apparatus for producing polyethylene film comprising a polyethylene film extruder provided with an extrusion die substantially as described with reference to Figs. 3, 4 and 5 of the accompanying drawings.
9. A polyethylene film made using the apparatus of Claim 8.
GB8004893A 1979-04-02 1980-02-13 Ribbed polyethylene film Withdrawn GB2045677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IE711410A IE790359L (en) 1979-04-02 1979-04-02 Ribbed polyethylene film

Publications (1)

Publication Number Publication Date
GB2045677A true GB2045677A (en) 1980-11-05

Family

ID=11011139

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8004893A Withdrawn GB2045677A (en) 1979-04-02 1980-02-13 Ribbed polyethylene film

Country Status (2)

Country Link
GB (1) GB2045677A (en)
IE (1) IE790359L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940237A1 (en) * 1989-12-05 1991-06-06 Int Patentmanagement Corp Film tubing with mesh-like reinforcement - is produced in one single operation by extruding from annular die between indented but rotated inner tool
WO2001064420A2 (en) * 2000-03-01 2001-09-07 Tecnomatic S.P.A. Extrusion head for tubular articles made of plastic materials
US20140178649A1 (en) * 2012-03-28 2014-06-26 The Glad Products Company Incrementally-stretched thermoplastic films with enhanced look and feel and methods for making the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3940237A1 (en) * 1989-12-05 1991-06-06 Int Patentmanagement Corp Film tubing with mesh-like reinforcement - is produced in one single operation by extruding from annular die between indented but rotated inner tool
WO2001064420A2 (en) * 2000-03-01 2001-09-07 Tecnomatic S.P.A. Extrusion head for tubular articles made of plastic materials
WO2001064420A3 (en) * 2000-03-01 2001-12-27 Tecnomatic Spa Extrusion head for tubular articles made of plastic materials
US20140178649A1 (en) * 2012-03-28 2014-06-26 The Glad Products Company Incrementally-stretched thermoplastic films with enhanced look and feel and methods for making the same
US9469441B2 (en) * 2012-03-28 2016-10-18 The Glad Products Company Incrementally-stretched thermoplastic films with enhanced look and feel and methods for making the same
AU2016203267B2 (en) * 2012-03-28 2017-12-14 The Glad Products Company Incrementally-stretched thermoplastic films with enhanced look and feel and methods for making the same

Also Published As

Publication number Publication date
IE790359L (en) 1980-10-02

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)