Method of making elastic plastic netting made of oriented strands

• US 5,256,353 A
• Filed: 12/23/1991
• Issued: 10/26/1993
• Est. Priority Date: 11/30/1989
• Status: Expired due to Term

• Current Assignee: TAMA Plastic Industry
• Original Assignee: TAMA Plastic Industry
• Inventors: Arnon, Yonatan, Leiber, Yuval, Agavof, Ya'Acov
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): Davis, Robert B.
• Application Number:
  US07/813,140
• Time in Patent Office: 673 Days
• Field of Search: 264/103, 264/146, 264/147, 264/288.4, 264/290.2, 264/210.1, 264/DIG. 47
• US Class Current: 264/103
• CPC Class Codes: A01F 2015/0745 Special features of the wrapping material for wrapping the bale
• CPC Class Codes: D01D 5/426 by cutting films
• CPC Class Codes: D04B 21/12 characterised by thread material
• CPC Class Codes: D10B 2321/021 polyethylene
• CPC Class Codes: D10B 2401/061 elastic
• CPC Class Codes: D10B 2505/10 Packaging, e.g. bags
• CPC Class Codes: Y10S 264/47 Processes of splitting film, webs or sheets
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/24074 Strand or strand-portions
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 442/10 Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]

Abstract

A method of making an elastic wrapper netting wherein linear low density polyethylene ribbons are knitted into a Raschel net. The ribbons of the knitted wrapper netting have an orientation of about 1:4.25 in the longitudinal direction.

Claims

1. A method of making a knitted thermoplastic netting having longitudinal ribbons and lateral ribbons, comprising the steps of:

producing a substantially unoriented primary film consisting essentially of linear low density polyethylene;

slitting the substantially unoriented primary film into longitudinal ribbons;

orienting by stretching the longitudinal ribbons to have a ratio of stretched oriented length to original substantially unoriented length of about 1;

4 to 1;

5; and

knitting said oriented longitudinal ribbons and the lateral ribbons into a knitted net;

wherein said knitted net has an elastic limit of more than about 6%, an elongation at break of more than about 60%, and an elasticity of more than about 15% when stretched more than 40%.

2. The method according to claim 1, further comprising of the step of orienting by stretching the longitudinal ribbons to produce a tensile energy at break (TEB) of about 80% of the maximum TEB possible for said ribbons measured up to an elongation of 130%.

3. The method according to claim 1, further comprising the steps of:

orienting by stretching said longitudinal ribbons to a width of between about 1.2 mm and 1.3 mm, a thickness of between about 0.04 mm and 0.05 mm, and a denier of between about 430 and 460; and

orienting by stretching the lateral ribbons to have a width of between about 1.2 mm and 1.3 mm, a thickness of between about 0.2 mm and 0.03 mm, and a denier of between about 240 and 250.

4. The method according to claim 3, further comprising the step of orientating said longitudinal ribbons to a ratio of about 1:

4.25.

5. The method according to claim 1, further comprising the step of orienting by stretching the lateral ribbons to have a ratio of stretched oriented length to original substantially unoriented length in excess of 1:

4.

6. The method according to claim 1, further comprising the step of orienting by stretching the lateral ribbons to have a ratio of stretched oriented length to original substantially unoriented length of about 1:

4 to 1;

5.