Heating – Processes of heating or heater operation – Continous strip – strand or web passed longitudinally through...
Patent
1979-09-14
1981-12-22
Camby, John J.
Heating
Processes of heating or heater operation
Continous strip, strand or web passed longitudinally through...
264234, 432 59, F27B 928
Patent
active
043068561
ABSTRACT:
There is disclosed a pre-heating apparatus for a thermoforming machine for uniformly heating a thermoplastics sheet or plate throughout, the apparatus comprising a first heating section (A), a cooling section (B) and a further heating section (C). Such arrangement ensures that both the outer and inner layers of the thermoplastics sheet or plate (1) are all at the same temperature when the sheet or plate is subjected to a thermoforming process. There is also disclosed a process for pre-heating a thermoplastics sheet or plate prior to subjecting such sheet or plate to a thermoforming process comprising firstly passing a sheet or plate through a heating section, thereafter through a cooling section and finally through a further heating section. The first heating section and the cooling section are preferably arranged vertically and the further heating section being arranged horizontally, the thermoplastics sheet or plate passing upwardly through the first heating section and downwardly through the cooling section.
REFERENCES:
patent: 2218354 (1940-10-01), Keller
patent: 2441500 (1948-05-01), Miess
patent: 3188066 (1965-06-01), Nordberg et al.
patent: 3476840 (1969-11-01), Glassford
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