US4730556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of screen printing with hot melt foam compositions
Assignee: Nordson Corp
•
Filing: 1985-10-28
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Granted: 1988-03-15
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Expires: 2005-10-28
Abstract
Abstract The method of screen printing with a hot melt foam composition includes providing a screen having the desired pattern to be transferred to a substrate, casting onto the screen a hot melt foam composition and forcing the foam composition through the screen to form the described pattern on the substrate. The method offers a number of advantages including the transfer of large amounts of hot melt inks through the screen, fast printing speeds, printing with highly viscous polymeric or thermosetting materials and control of processing temperatures, among other advantages.
Inventors
- 👤 Walter H. Cobbs, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A method of hot melt screen printing a pattern onto a substrate comprising providing a screen having a desired pattern of porous and nonporous areas adjacent the substrate, heating a nonaqueous thermoplastic to form a hot melt composition of molten thermoplastic, foaming said hot melt composition by introducing a gas to form a hot melt foam composition having a lower viscosity and higher heat retention than the unfoamed hot melt composition, coating onto said screen the hot melt foam composition, and forcing the hot melt foam composition through the porous areas of the screen to form the desired pattern of the composition on the substrate.
Claim 2
Independent Claim
105 words
A method of hot melt screen printing a pattern onto a substrate comprising providing a screen having a desired pattern of porous and nonporous areas adjacent the substrate, heating a nonaqueous thermoplastic to form a hot melt composition of molten thermoplastic, foaming said hot melt composition by introducing a gas to form a hot melt foam composition having a lower viscosity and higher heat retention than the unfoamed hot melt composition, coating onto said screen the hot melt foam composition, and forcing the hot melt foam composition through the porous areas of the screen to form the desired pattern of the composition on the substrate.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein a squeegee is passed across the screen to force the hot melt foam composition through the porous screen areas.
Claim 4
Dependent Claim
39 words
The method according to claim 1 wherein the hot melt foam composition is formed by dispersing gas bubbles in a molten thermoplastic material to form a hot solution, foaming the solution and coating the foamed solution onto the screen.
Claim 5
Dependent Claim
16 words
The method according to claim 3 wherein a surfactant is incorporated into the molten thermoplastic material.
Claim 6
Dependent Claim
37 words
The method according to claim 1 wherein the hot melt foam composition is formed by dispensing a thermoplastic material containing a foaming agent which volatilizes to introduce said gas and produce a stable foam at atmospheric conditions.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein said foaming agent is a volatile solvent.
Claim 8
Dependent Claim
42 words
The method according to claim 1 wherein the hot melt foam composition contains a polymer selected from the group consisting of a polyolefin or copolymer thereof, a polymer of a conjugated diene or copolymer thereof, polyester, polyamide, polyurethane, polyepoxy and cellulose esters.
Claim 9
Dependent Claim
16 words
The method according to claim 1 wherein said hot melt foam composition comprises a thermosetting resin.
Claim 10
Dependent Claim
14 words
The method according to claim 8 wherein said thermosetting resin is a polyester resin.
Claim 11
Dependent Claim
20 words
The method according to claim 1 wherein the screen is heated to assist in the passage of foam melt therethrough.
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |