Stretch film

• US 7,682,683 B2
• Filed: 12/09/2002
• Issued: 03/23/2010
• Est. Priority Date: 01/16/2002
• Status: Expired due to Fees

• Current Assignee: Megaplast S.A.
• Original Assignee: Megaplast S.A.
• Inventors: Kavvadias, Harilaos, Markakis, Damianos
• Primary Examiner(s): Watkins, III; William P
• Application Number:
  US10/501,799
• Publication Number:
  US 20050118391A1
• Time in Patent Office: 2,661 Days
• Field of Search: 428/134, 428/136, 428/137, 428/138
• US Class Current: 428/138
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 3/14 characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side B32B5/02 takes precedence
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B65D 2205/02 Venting holes
• CPC Class Codes: B65D 2571/0003 Mechanical characteristics of the stretch film
• CPC Class Codes: B65D 75/006 in stretch films
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24298 Noncircular aperture [e.g., slit, diamond, rectangular, etc.]
• CPC Class Codes: Y10T 428/24314 Slit or elongated
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component

Abstract

A stretch film with a base (1) consisting of a film material and with a multitude of holes (2) that are formed in the base (1) in several rows (3) of holes extending, in essence, in parallel to each other and in a main direction (X) comprises at least one layer of strips (4) consisting of a film material and extending in the main direction (X), said layer being arranged on the base (1) between the rows (3) of holes. Owing to the applied strips (4), a high stretchability of the stretch film can be achieved.

Claims

1. Stretch film comprising a base consisting of a film material;

a multitude of holes, said holes being formed in the base in several rows extending in parallel to each other and in a main direction;

said stretch film further comprising;

at least two layers of reinforcing strips consisting of a film material and extending in the main direction wherein said at least two layers of strips are attached to the base one above the other between the rows of holes, wherein said at least two layers of strips are only attached to the base and to each other at their major planar faces and wherein respective pairs of adjacent strips are disposed on both sides of a row of holes, said at least two layers of strips being devoid of said holes;

wherein the width of at least a part of the separation between the respective adjacent pairs of strips extending in transverse direction in relation to the main direction, is dimensioned such that the strips each reach up to the rows of holes adjacent to said strips to define between said respective pairs of adjacent strips a fixed width for said holes extending in the transverse direction, for preventing the development of tears in the film material and for preventing the spreading of such tears;

wherein the strips are generally even, but at least without wrinkles; and

wherein each hole is surrounded by a bead having a thickness that exceeds a thickness of the base.

2. Stretch film according to claim 1, wherein the strips are attached to the base or the associated strip carrying said strips by adhesion.

3. Stretch film according to claim 1, wherein the strips are applied without sealing or bonding.

4. Stretch film according to claim 1, wherein the holes of neighboring rows of holes are staggered in relation to the main direction.

5. Stretch film according to claim 1, wherein the base is prestretched together with the strips.

6. Stretch film according to claim 1, wherein the width of each row of holes is equal to the diameter of said holes.

7. Stretch film according to claim 1, wherein a single row of holes is located between said respective pairs of adjacent strips, wherein said holes in each of said rows are aligned linearly.