B - Operations – Transporting – 29 – H
Patent
B - Operations, Transporting
29
H
18/125, 18/718
B29H 17/00 (1980.01)
Patent
CA 1141120
Abstract of the Disclosure There is disclosed a new and improved plastic extrusion structure and manufacturing apparatus and method for producing the same. The disclosure is directed to a specific application of the present invention in the form of a tire which includes a peripheral surface having a tread thereon which tread includes not only longitudinal and circumferential grooves, but in addition, non-longitudinal or lateral grooves us well. The plastic tire also includes annular sidewalls naving circumferential side margin portions adjacent the peripheral surface of the tire, which side margin portions also include a tread pattern thereon. The plastic tires are of the type formed from extruded plastic material and the manufacturing apparatus disclosed is adapted to form a tread on the surface of the extruded plastic material having any predetermined pattern of grooves. The apparatus includes a first die means for shaping the extruded plastic to a predetermined cross-section including a tread receiving portion and second die means including a rotatable wheel immediately adjacent the first die means. The wheel includes a peripheral embossing surface defining a predetermined tread pattern and is arranged to engage and emboss the predetermined tread pattern onto the tread receiving surface of the extruded plastic. Preferably, the first and second die means are enclosed within a common housing so that each acts upon the extruded plastic while the plastic is in a malleable state.
348412
Hamelin Robert
Smart & Biggar
LandOfFree
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