Double belt moulding machine

Details Double belt moulding machine Double belt moulding machine

1989-12-21

1991-01-01

Heitbrink, Jill L.

Plastic article or earthenware shaping or treating: apparatus

With electrical control system

425335, 425371, 425817C, B29C 3916

Patent

active

049814273

ABSTRACT:
The invention relates to a double belt moulding machine for producing foamed plastic plates as a continuous strand. Two endless conveyor belts are moved in opposite rotation directions. The belts can be in the form of straps, steel strips, plate belts, etc., which are each guided over one drive pulley or drive sprockets in the case of plate belts, support elements in the form of slideways or slide rails and a guide pulley or sprocket. According to the invention the drive pulleys or sprockets for the two belts are provided with individual electric drives regulated to synchronize of the facing belt sections. Thus, destructive shear forces within the foam strand in the mould channel are avoided.

REFERENCES:
patent: 3381609 (1968-05-01), Malarkey, Jr.
patent: 3887314 (1975-06-01), Andresen et al.
patent: 3957413 (1976-05-01), Lieberman
patent: 4178144 (1979-12-01), Tabler
patent: 4265608 (1981-05-01), Tunador et al.
patent: 4371414 (1983-02-01), Ahrweiler
patent: 4375350 (1983-03-01), Sato
patent: 4506200 (1985-03-01), Datwyler et al.
patent: 4559990 (1985-12-01), Greilinger et al.
patent: 4589948 (1986-05-01), Held

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