US4724983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for liquefying a thermoplastic plastic
Assignee: Nordson Corp
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Filing: 1986-12-23
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Granted: 1988-02-16
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Expires: 2006-12-23
Abstract
Abstract An apparatus for liquefying a thermoplastic plastic, in particular an adhesive on the basis of polyurethane, comprises a supply container for the thermoplastic plastic, a heating means for heating the thermoplastic plastic disposed in the supply container and a collecting trough for the liquefied plastic disposed beneath the supply container, from which trough the plastic is supplied to the further processing. The heatable supply container includes an upper portion for receiving a downwardly open transport container for the thermoplastic plastic and a lower portion serving as buffer volume. The heated plastic flows out of the transport container downwardly through the buffer volume into the collecting trough.
Inventors
- 👤 Henning J. Claassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:55
CPC Classifications
B; B29; B29B; B29B13/00; B29B13/02; B29B13/022; B29C; B29C2791/00; B29C2791/004; B29C2791/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
An apparatus for liquefying a thermoplastic plastic, in particular an adhesive on the basis of polyurethane, comprising (a) a supply container for the thermoplastic plastic, (b) a heating means for heating the thermoplastic plastic disposed in the supply container and (c) a collecting trough for the liquefied thermoplastic plastic disposed beneath the supply container, wherein (d) the heatable supply container comprises an upper portion for receiving a downwardly open transport container for the thermoplastic plastic and a lower portion serving as buffer volume.
Claim 2
Independent Claim
83 words
An apparatus for liquefying a thermoplastic plastic, in particular an adhesive on the basis of polyurethane, comprising (a) a supply container for the thermoplastic plastic, (b) a heating means for heating the thermoplastic plastic disposed in the supply container and (c) a collecting trough for the liquefied thermoplastic plastic disposed beneath the supply container, wherein (d) the heatable supply container comprises an upper portion for receiving a downwardly open transport container for the thermoplastic plastic and a lower portion serving as buffer volume.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1, wherein the supply container is detachably secured to a lower part with the collecting trough.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 2, wherein between the lower edge of the supply container and the upper edge of the lower part seals are disposed.
Claim 5
Dependent Claim
17 words
An apparatus according to claim 3, wherein insulating seals on the basis of mineral fibres are used.
Claim 6
Dependent Claim
32 words
An apparatus according to claim 1, wherein the inner wall of the supply container comprises an inwardly projecting annular web which serves as support for the lower edge of the transport container.
Claim 7
Dependent Claim
23 words
An apparatus according to claim 1, wherein in the wall of the supply container bores with insulated electrical resistance heating elements are provided.
Claim 8
Dependent Claim
35 words
An apparatus according to claim 1, wherein the buffer volume of the lower part of the supply container is at least as large as the filling volume of the largest transport container to be handled.
Claim 9
Dependent Claim
20 words
An apparatus according to claim 1, wherein at the upper end of the supply container a cover is pivotally attached.
Claim 10
Dependent Claim
35 words
An apparatus according to claim 8, wherein at the inner side of the cover a mandrel is provided whose tip when the cover is closed penetrates into the upwardly directed face of the transport container.
Claim 11
Dependent Claim
15 words
An apparatus according to claim 8, wherein a latch means is provided for the cover.
Claim 12
Dependent Claim
17 words
An apparatus according to claim 8, wherein seals are disposed between the cover and the supply container.
Claim 13
Dependent Claim
16 words
An apparatus according to claim 1, wherein the supply container is surrounded by a heat-protecting hood.
Claim 14
Dependent Claim
26 words
An apparatus according to claim 1, wherein a conduit is provided for supplying an inert gas, in particular nitrogen, to the interior of the supply container.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |