Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Applying indicia or design
Patent
1982-03-11
1984-05-15
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Applying indicia or design
15624412, 15624427, 264171, 264175, 264284, 425 94, 425104, 425113, 425115, 425505, 425516, 425517, B29D 902
Patent
active
044487398
ABSTRACT:
The invention relates to a method and a device for manufacturing multi-ply sheets of extrudable plastics material supplied by way of at least two webs which are produced by extruders having flat sheet dies and which are bonded to a structured insert web by means of rolls. Moreover, the invention relates to multi-ply sheets thus produced, especially for use with a shower enclosure. In manufacturing such multi-ply sheets it is difficult to obtain a reliable bond between the webs and the structured web without sophisticated machinery. There is also the requirement that the structured web be uniformly introduced between the webs. The invention proposes to feed these webs to a single common set of rolls and to arrange the flat sheet die of at least one extruder so close to a set of rolls that a reliable permanent bond to the structured web and/or at the other web is obtained by the heat accumulated and carried in the one web just extruded.
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