Apparatus for producing oriented plastic strap

Details Apparatus for producing oriented plastic strap Apparatus for producing oriented plastic strap

1997-02-04

1998-01-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

264175, 2642105, 425327, 425363, 425461, B29C 2508

Patent

active

057076600

ABSTRACT:
An apparatus for producing an oriented plastic strap having a predetermined desired thickness for use in connection with the strapping of packages or the like. Heating is provided in connection with the surface of the sheet workpiece which is exposed to the ambient air prior to entry of the workpiece into the nip defined between the pair of rollers such that both surfaces will have similar temperature levels so as to exhibit similar density properties, and still further, the edge portions of the sheet workpiece are also heated so as to advantageously control the degree of flatness of the sheet material or workpiece across the width thereof. The flatness quality of the sheet workpiece can also be achieved through means of specially contoured milling rollers defining the zero gap assembly nip, or by means of specially contoured extrusion dies, whereby the edge portions are rendered thinner as compared to the central portion of the sheet workpiece such that upon milling and stretching of the workpiece, which operations tend to thicken the edge portions of the sheet workpiece, the edge portions will exhibit thickness dimensions commensurate with the thickness dimension of the central portion of the sheet workpiece.

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"Principles of Polymer Processing" by Tadmor and Gogos .apprxeq.1979 pp. 363-372, 442-446 & 661-663.

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