US3784004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skin packaging process and skin package thereof
Assignee: Stone Container Corp
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Filing: 1972-02-28
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Granted: 1974-01-08
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Expires: 1992-02-28
Abstract
Abstract A method of making a skin package which comprises carding an article on a substrate of porous or air-permeable material having a meltable, thermoplastic barrier coating subtending the article which renders the substrate substantially impervious to passage of air or moisture therethrough; feeding the substrate with carded article to the vacuum forming station of a skin packaging machine concurrently with the feeding of said article-bearing substrate and a thermoplastic film below a heater assembly sufficiently to raise the temperature of the film above the melt temperature thereof and permit the radiant heat from the heater assembly and the film to raise the temperature of the barrier coating above its melt temperature with exception of that part of the barrier coating immediately subtending said article; said parts of the substrate which have melted barrier coating thereon being impregnated therewith and thereby being rendered pervious to air so as to permit a vacuum draw through the substrate for vacuum forming the softened plastic film around the article and laminating same to the substrate. The resulting skin package has an air impervious area immediately below the carded article provided by the unmelted coating which thereafter functions as a moisture vapor barrier for the film encased article.
Inventors
- 👤 M Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:16
CPC Classifications
B; B65; B65B; B65B11/00; B65B11/50; B65B11/52; B65D; B65D75/00; B65D75/28; B65D75/30; B65D75/305
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
208 words
A method of making a skin package comprising: coating the surface of a porous substrate sheet with a low-temperature meltable thermoplastic barrier coating material, carding an article on the substrate overlying said coating, feeding the substrate with carded article to a vacuum-forming station of a skin-packaging machine along with a thermoplastic film below the heater assembly of said machine heating said film so as to enable the radiant heat from the heater assembly to raise the temperature of the film above the melt temperature thereof and permit the radiant heat from the heater assembly and the film to raise the temperature of the barrier coating above its melt temperature with the exception of that part of the barrier coating immediately subtending said article, the melted baRrier coating being absorbed by the substrate whereby to render the same pervious to air by effecting a protective barrier coating layer on the substrate which renders that part of the substrate having said layer impervious to air, laminating the thermoplastic film by vacuum draw through the air-pervious parts of the substrate to said substrate parts and encasing the article in a skin-like chamber which has the mouth thereof closed by said protective barrier layer to hermetically seal the article in said chamber.
Claim 2
Independent Claim
208 words
A method of making a skin package comprising: coating the surface of a porous substrate sheet with a low-temperature meltable thermoplastic barrier coating material, carding an article on the substrate overlying said coating, feeding the substrate with carded article to a vacuum-forming station of a skin-packaging machine along with a thermoplastic film below the heater assembly of said machine heating said film so as to enable the radiant heat from the heater assembly to raise the temperature of the film above the melt temperature thereof and permit the radiant heat from the heater assembly and the film to raise the temperature of the barrier coating above its melt temperature with the exception of that part of the barrier coating immediately subtending said article, the melted baRrier coating being absorbed by the substrate whereby to render the same pervious to air by effecting a protective barrier coating layer on the substrate which renders that part of the substrate having said layer impervious to air, laminating the thermoplastic film by vacuum draw through the air-pervious parts of the substrate to said substrate parts and encasing the article in a skin-like chamber which has the mouth thereof closed by said protective barrier layer to hermetically seal the article in said chamber.
Claim 3
Dependent Claim
24 words
A method as described in claim 1 in which said coating is applied to the surface of the substrate next adjacent the carded article.
Claim 4
Dependent Claim
26 words
The method described in claim 1 in which the coating is applied to the surface of the substrate opposite that surface next adjacent the carded article.
Claim 5
Dependent Claim
19 words
The method as described in claim 1 in which the substrate is heated only during lamination of said film.
Claim 6
Dependent Claim
37 words
The method as described in claim 1 in which the substrate is a continous sheet of material having said coating over an entire surface thereof and is fed to the skin-packaging machine continuously from a roll thereof.
Claim 7
Dependent Claim
40 words
A method described in claim 1 in which said substrate comprises a rectangular sheet of paperboard having said coating over one surface thereof and the coated substrate sheets are fed with carded articles thereon intermittently to a batch-type skin-packaging machine.
Claim 8
Dependent Claim
16 words
The method as described in claim 1 in which said coating comprises a hot-melt wax material.
Claim 9
Dependent Claim
42 words
The method as described in claim 1 in which there is a thermoplastic adhesive primer material interposed between the coating and substrate surface next adjacent the article thereon whereby to provide a stronger adhesive bond with the film laminated to the substrate.
Claim 10
Dependent Claim
152 words
A skin package comprising a normally porous substrate sheet, a meltable protection barrier coating supported over the entire surface of said substrate, an article carded on a surface of said substrate, a thermoplastic film formed over said article in skintight encasement therewith and having peripheral parts laminated to said surface of said substrate to provide a skin-like chamber for the article encased therein with a mouth portion of said chamber contiguous to said substrate, said meltable protection barrier closing off the mouth of said chamber to hermetically seal the article therein, the portion of said substrate not covered by said article having said coating melted and absorbed therein so as not to interfere with the normal porosity of said substrate, said substrate portion underlying said article having the coating unmelted thereat rendering said last mentioned substrate portion impervious to passage of air therethrough to form a vapor protection barrier for the article.
Claim 11
Dependent Claim
152 words
A skin package comprising a normally porous substrate sheet, a meltable protection barrier coating supported over the entire surface of said substrate, an article carded on a surface of said substrate, a thermoplastic film formed over said article in skintight encasement therewith and having peripheral parts laminated to said surface of said substrate to provide a skin-like chamber for the article encased therein with a mouth portion of said chamber contiguous to said substrate, said meltable protection barrier closing off the mouth of said chamber to hermetically seal the article therein, the portion of said substrate not covered by said article having said coating melted and absorbed therein so as not to interfere with the normal porosity of said substrate, said substrate portion underlying said article having the coating unmelted thereat rendering said last mentioned substrate portion impervious to passage of air therethrough to form a vapor protection barrier for the article.
Claim 12
Dependent Claim
19 words
A skin package as described in claim 9 in which said coating material comprises a low temperature hot-melt wax.
Claim 13
Dependent Claim
29 words
A skin package as described in claim 9 in which said coating has been applied to the surface of the substrate next adjacent the surface supporting the article thereon.
Claim 14
Dependent Claim
28 words
A skin package as described in claim 9 in which said coating is applied to the surface of the substrate opposite the one having the article supported thereon.
Claim 15
Dependent Claim
42 words
A skin package as described in claim 11 in which there is an adhesive primer coating interposed between the first coating and the substrate for forming a stronger bond between the film and the substrate surface to which the film is laminated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |