B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1040, 18/1078
B29C 51/22 (2006.01) B29C 51/02 (2006.01) B29C 47/00 (2006.01)
Patent
CA 1127364
ABSTRACT OF THE DISCLOSURE A method and apparatus are provided for continuously extruding biaxially oriented and formed molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage for further extrusion. The method involves the steps of continu- ously extruding a relatively narrow web of thermoplastic material and con- tinuously transporting the extruded web at a first downstream velocity away from the point of extrusion while controlling the temperature of the web to an optimum value for biaxial orientation; receiving and biaxially stretching the transported web in a continuous manner to effect biaxial orien- tation therein and to dimension the web for subsequent forming by increas- ing its length and width and decreasing its thickness and continuously transporting the biaxially oriented web at a second downstream velocity aw away from the point of biaxial orientation; substantially immediately and continuously transferring the biaxially oriented web into conformal engage- ment with an undulating rotating peripheral surface travelling at substan- tially the second downstream velocity to preclude loss of such orientation; and forming products from the oriented,web, wherein stress placed in the thermoplastic material by the biaxial orientation is substantially main- tained from the initiation of the orientation to the forming of the products therein. The apparatus is specially adapted to carry out that method. Such method and system provided is very facile and variable with regard to unique and unusual shapes. A continuous method with a relatively high speed of production and high quality control with a low inertia apparatus is readily effectuated.
323052
Marcus & Associates
Maryland Cup Corporation
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