US3933244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrink-wrapping of articles
Assignee: BXL Plastics Ltd
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Filing: 1973-12-05
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Granted: 1976-01-20
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Expires: 1993-12-05
Abstract
Abstract Double-wrap shrink-pack, and method of making it comprising wrapping at least one article in an ethylene polymer film, preferably a polyethylene film, to give a package, and shrink-wrapping a plurality of such packages in an ethylene polymer film, preferably a polyethylene film, to give a double-wrap shrink-pack, wherein one of said films, preferably the second of said films, contains an amount of anti-block additive and the other of said films is substantially free of anti-block additive.
Inventors
- 👤 Merfyn Jones Hughes
- 👤 Derek William Shorten
- 👤 Graham Westley Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:42
CPC Classifications
B; B65; B65D; B65D71/00; B65D71/06; B65D71/08; B65D75/00; B65D75/38; C; C08; C08K; C08K5/00; C08K5/01; B65D2571/00; B65D2571/00006; B65D2571/00012; B65D2571/00018; B65D2571/00024
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
92 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film to form a first package, collating a plurality of said packages to form a collation, and shrink-wrapping said collation in a second ethylene polymer film, which is heat-shrinkable, to form a second package, wherein one of said films contains an anti-block additive present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-block additive.
Claim 2
Dependent Claim
92 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film to form a first package, collating a plurality of said packages to form a collation, and shrink-wrapping said collation in a second ethylene polymer film, which is heat-shrinkable, to form a second package, wherein one of said films contains an anti-block additive present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-block additive.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein said first package is made by seal-wrapping at least one article in said first ethylene polymer film.
Claim 4
Dependent Claim
32 words
The method of claim 1, wherein said first package is made by shrink-wrappng at least one article in said first ehtylene polymer film, said first ethylene polymer film being a heat-shrinkable film.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein at least one ethylene polymer film is a polyethylene film.
Claim 6
Dependent Claim
16 words
The method of claim 4, wherein at least one polyethylene film is a low-density polyethylene film.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein at least one ethylene polymer film is an ethylene-vinyl acetate copolymer film.
Claim 8
Dependent Claim
28 words
The method of claim 6, wherein at least one ethylene-vinyl acetate polymer film has an ethylene unit content of at least 90 % by weight of the copolymer.
Claim 9
Dependent Claim
28 words
The method of claim 6, wherein at least one ethylene-vinyl acetate polymer film has an ethylene unit content of at leat 96 % by weight of the copolymer.
Claim 10
Dependent Claim
24 words
The method of claim 1, wherein the anti-block additive is selected from the group consisting of lauramide, myristamide, palmitamide, stearamide, oleamide, erucamide, and behenamide.
Claim 11
Dependent Claim
32 words
The method of claim 1, wherein the amount of anti-block additive in the anti-block additive-containing film is in the range of from 1.0 to 2.5 % by weight of the ethylene polymer.
Claim 12
Dependent Claim
26 words
The method of claim 1, wherein said first ethylene polymer film is substantially free from anti-block additive, and said second ethylene polymer film contains anti-block additive.
Claim 13
Dependent Claim
18 words
The method of claim 1, wherein at least one ethylene polymer film is a ethylene ethyl-acrylate copolymer film.
Claim 14
Dependent Claim
27 words
The method of claim 12, wherein at least one ethylene ethyl-acrylate copolymer film has an ethylene unit content of at least 90% by weight of the polymer.
Claim 15
Dependent Claim
27 words
The method of claim 12, wherein at least one ethylene ethyl-acrylate copolymer film has an ethylene unit content of at least 96% by weight of the copolymer.
Claim 16
Dependent Claim
73 words
Double-wrap pack comprising a collation of a plurality of first packages each comprising at least one article wrapped in first ethylene polymer film, said collation being shrink-wrapped in a second ethylene polymer film, wherein one of said film contains an anti-block additive present in an amoutn between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-blocking additive.
Claim 17
Dependent Claim
73 words
Double-wrap pack comprising a collation of a plurality of first packages each comprising at least one article wrapped in first ethylene polymer film, said collation being shrink-wrapped in a second ethylene polymer film, wherein one of said film contains an anti-block additive present in an amoutn between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-blocking additive.
Claim 18
Dependent Claim
27 words
Double-wrap pack according to claim 15, wherein said first ethylene polymer film is substantially free from anti-block additive, and said second ethylene polymer film contains anti-block additive.
Claim 19
Dependent Claim
24 words
Double-wrap pack according to claim 15, wherein each of said first packages comprises at least one article seal-wrapped in said first ethylene polymer film.
Claim 20
Dependent Claim
24 words
Double-wrap pack according to claim 15, wherein each of said first packages comprises at least one article shrink-wrapped in said first ethylene polymer film.
Claim 21
Dependent Claim
12 words
Double-wrap pack according to claim 15, wherein each ethylene polymer is polyethylene.
Claim 22
Dependent Claim
13 words
Double-wrap pack according to claim 15, wherein the anti-block additive is N,N'-distearoyl-ethylene diamine.
Claim 23
Dependent Claim
109 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film to form a first package, collating a plurality of said packages to from a collation, and shrink-wrapping said collation in a second ethylene polymer film, which is heat-shrinkable, to form a second package, wherein one of said films is substantially free from anti-block additive, and the other of said films contains as an anti-block additive an N,N'-bis-(long-chain alkoyl)-alkylene diamine having a melting point within the range of from 100° to 180°C present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive.
Claim 24
Dependent Claim
109 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film to form a first package, collating a plurality of said packages to from a collation, and shrink-wrapping said collation in a second ethylene polymer film, which is heat-shrinkable, to form a second package, wherein one of said films is substantially free from anti-block additive, and the other of said films contains as an anti-block additive an N,N'-bis-(long-chain alkoyl)-alkylene diamine having a melting point within the range of from 100° to 180°C present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive.
Claim 25
Dependent Claim
12 words
The method of claim 21, wherein the anti-block additive is N,N'-distearoyl-ethylene diamine.
Claim 26
Dependent Claim
44 words
The method of claim 21, wherein said first ethylene polymer film is of a thickness within the range of from 30 to 50 microns, and wherein said second ethylene polymer film is of a thickness within the range of from 50 to 250 microns.
Claim 27
Dependent Claim
120 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film having a thickness within the range of from 30 to 50 microns to form a first package, collating a plurality of said packages to form a collation, and shrink-wrapping said collation in a second ethylene polymer film having a thickness within the range of from 50 to 250 microns, which second film is a heat-shrinkable film, to form a second package, wherein one of said films contains an anti-block additive present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-block additive.
Claim 28
Dependent Claim
120 words
Method of making a double-wrap pack which comprises wrapping at least one article in a first ethylene polymer film having a thickness within the range of from 30 to 50 microns to form a first package, collating a plurality of said packages to form a collation, and shrink-wrapping said collation in a second ethylene polymer film having a thickness within the range of from 50 to 250 microns, which second film is a heat-shrinkable film, to form a second package, wherein one of said films contains an anti-block additive present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive, and the other of said films is substantially free from anti-block additive.
Claim 29
Dependent Claim
92 words
Double-wrap pack comprising a collation of a plurality of said first packages each comprising at least one article wrapped in a first ethylene polymer film, said collation being shrink-wrapped in a second ethylene polymer film, wherein one of said films is substantially free from anti-block additive, and the other of said films contains as an anti-block additive an N,N'-bis-(long-chain alkoyl)-alkylene diamine having a melting point within the range of from 100° to 180°C present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive.
Claim 30
Dependent Claim
92 words
Double-wrap pack comprising a collation of a plurality of said first packages each comprising at least one article wrapped in a first ethylene polymer film, said collation being shrink-wrapped in a second ethylene polymer film, wherein one of said films is substantially free from anti-block additive, and the other of said films contains as an anti-block additive an N,N'-bis-(long-chain alkoyl)-alkylene diamine having a melting point within the range of from 100° to 180°C present in an amount between the effective anti-blocking amount of said additive and the self-heat-sealing-preventing amount of said additive.
Claim 31
Dependent Claim
14 words
The double-wrap pack of claim 25 in which said anti-block additive is N,N'-distearoyl-ethylene diamine.
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |