US4366369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for heating sheet-like thermoplastic preshapes
Assignee: BASF SE
•
Filing: 1981-02-20
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Granted: 1982-12-28
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Expires: 2001-02-20
Abstract
Abstract In an apparatus for heating preshapes consisting of a thermoplastic, in particular a fiber-reinforced plastic, the preshape is fed, by a conveyor belt, to a heating apparatus equipped with bright infra-red radiators. To provide time-dependent metering of the thermal energy, the installation possesses an electronic control unit, equipped with a microprocessor, which unit generates a periodically increasing and decreasing electrical signal voltage, whose time-curve and amplitude can be varied in accordance with the heat uptake capacity of the preshape. The signal voltage additionally controls a feed unit, which in turn feeds to the heating apparatus, by means of a phase control system, a periodic electric current which in its time-curve and amplitude corresponds to the pre-programmed signal voltage.
Inventors
- 👤 Karl Hagen
- 👤 Karl H. Scholl
- 👤 Gerhard Schmelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:00
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/0288; B29C35/08; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20; G05D23/22; B29C37/00; B29C2037/90; B29C2037/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
An arrangement for heating sheet-like preshapes consisting of a thermoplastic, especially of a fiber-reinforced thermoplastic, said arrangement comprising an infra-red heating apparatus equipped with bright infra-red radiators, a conveyor belt feeding the preshapes to said apparatus, an electronic control unit provided with a microprocessor, said control unit generating a periodically increasing and decreasing electrical signal voltage, whose time-curve and amplitude are variable in accordance with the heat uptake capacity of the preshapes, and a feed unit controlled by the signal voltage, said feed unit having phase-controlled rectifier means for in turn metering to the heating apparatus, a periodic electrical current which in its time-curve and amplitude corresponds to the preprogrammed signal voltage.
Claim 2
Dependent Claim
112 words
An arrangement for heating sheet-like preshapes consisting of a thermoplastic, especially of a fiber-reinforced thermoplastic, said arrangement comprising an infra-red heating apparatus equipped with bright infra-red radiators, a conveyor belt feeding the preshapes to said apparatus, an electronic control unit provided with a microprocessor, said control unit generating a periodically increasing and decreasing electrical signal voltage, whose time-curve and amplitude are variable in accordance with the heat uptake capacity of the preshapes, and a feed unit controlled by the signal voltage, said feed unit having phase-controlled rectifier means for in turn metering to the heating apparatus, a periodic electrical current which in its time-curve and amplitude corresponds to the preprogrammed signal voltage.
Claim 3
Dependent Claim
25 words
An arrangement as claimed in claim 1, which also comprises a temperature-regulating unit which is interactively connected to the heating apparatus and the feed unit.
Claim 4
Dependent Claim
37 words
An arrangement as claimed in claim 1 or 2, wherein the heating apparatus possesses a plurality of heating zones arranged in the direction of travel of the conveyor belt and switchable in sequence by the control unit.
Claim 5
Dependent Claim
32 words
An arrangement as claimed in claim 1, wherein the control unit is adapted to vary the speed of travel of the conveyor belt as a function of the metering of thermal energy.
References Cited (Backward Citations)
DE1072638B
Cited
DE2216651B2
Cited
US3980863A
Cited
US4180721A
Cited
DE2728825A1
Cited
DE2854393A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |