US4833017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particle-impregnated one-sided cling stretch wrap film
Assignee: Pactiv LLC
•
Filing: 1987-04-17
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Granted: 1989-05-23
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Expires: 2007-04-17
Abstract
Abstract A thermoplastic stretch wrap film exhibits a significant level of cling on one surface but no appreciable cling force on the other, the latter surface exhibiting a slide property when in contact with a film or like surface due to the presence of particulate antiblock agent mechanically bonded thereto. The film can be used to overwrap one or a group of articles to form a unitized packaged unit employing any of the known and conventional tension-wrapping techniques. Because of its one-sided cling and slide capabilities, pallet loads overwrapped with the film and in mutual contact avoid film tearing or destruction when the pallet loads are separated from each other.
Inventors
- 👤 Gordon L. Benoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:49
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/58; B29C70/64; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B65; B65D; B65D65/00; B65D65/38; C; C08; C08J; C08J5/00; C08J5/18; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/08; B29K2023/083; B29L; B29L2007/00; B29L2007/008; B32B2323/00; B32B2323/04; B32B2323/046; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31924; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A stretch wrap film which comprises a thermoplastic film, fabricated from a polyolefin film-forming resin possessing a cling property on one surface thereof and substantially no cling property on the opposite surface thereof, the latter surface possessing a slide property said latter surface having a particulate antiblock agent mechanically bonded to said surface.
Claim 2
Dependent Claim
53 words
A stretch wrap film which comprises a thermoplastic film, fabricated from a polyolefin film-forming resin possessing a cling property on one surface thereof and substantially no cling property on the opposite surface thereof, the latter surface possessing a slide property said latter surface having a particulate antiblock agent mechanically bonded to said surface.
Claim 3
Dependent Claim
14 words
The stretch wrap film of claim 1 wherein the film is a monolayer film.
Claim 4
Dependent Claim
14 words
The stretch wrap film of claim 1 wherein the film is a multilayer film.
Claim 5
Dependent Claim
19 words
The stretch wrap film of claim 2 wherein the film is fabricated from a linear low density polyethylene resin.
Claim 6
Dependent Claim
26 words
The stretch wrap film of claim 4 wherein the linear low density polyethylene film inherently exhibits a cling property in the absence of added cling agent.
Claim 7
Dependent Claim
28 words
The stretch warp film of claim 4 wherein the linear low density polyethylene film does not exhibit any significant cling property in the absence of added cling agent.
Claim 8
Dependent Claim
11 words
The stretch wrap film of claim 1 containing a cling agent.
Claim 9
Dependent Claim
81 words
The stretch wrap film of claim 3 wherein the film possesses two layers, one film layer being fabricated from a linear low density polyethylene film which inherently exhibits a significant cling force and, contain an added cling agent, or a linear low density polyethylene film which does not exhibit a significant cling force in the absence of added cling agent and to which cling agent is added, the other film layer being fabricated from a high pressure low density polyethylene resin.
Claim 10
Dependent Claim
45 words
The stretch wrap film of claim 3 wherein the film possesses two layers, one film layer being fabricated from ethylene-vinyl acetate copolymer possessing a cling force, the other layer being fabricated from a linear low density polyethylene resin which does not exhibit a cling force.
Claim 11
Dependent Claim
41 words
The stretch wrap film of claim 3 wherein the film is a three layer film, said film being a coextrudate of a linear low density polyethylene core layer and ethylene-vinyl acetate copolymer and high pressure low density polyethylene resin surface layers.
Claim 12
Dependent Claim
48 words
The stretch wrap film of claim 1 wherein said latter surface having the particulate antiblock agent mechanically bonded thereto by directing a stream of particulate antiblock agent against said outer exposed surface while the surface is in semi-plastic state followed by applying a particulate-embedding force against said surface.
Claim 13
Dependent Claim
40 words
The stretch wrap film of claim 1 wherein said latter surface having the particulate antiblock agent mechanically bonded thereto by electrostatically adhering the particulate antiblock agent to said outer exposed surface, followed by applying a particle-embedding force against said surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |