APPARATUS FOR FABRICATING THREE-DIMENSIONAL PAPER-MOLDED PRODUCTS WITH ZERO-DRAFT ANGLES
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United States of America Patent
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Issued Date -
Oct 3, 2019
app pub date -
Aug 2, 2018
filing date -
Mar 30, 2018
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Abstract
An apparatus for fabricating three-dimensional paper-molded products with zero-draft angles is disclosed herein, which comprises at least one conveying rail and at least three sets of mold assemblies for sequentially applying a pre-compression, a first thermo-compression and a second thermo-compression on each semi-finished product. The at least three sets of mold assemblies are collocated, in ascending order of their transversally cross-sectional concave widths, along the at least one conveying rail. By gradually compressing the semi-finished product in sequence of compression operations of the at least three sets of mold assemblies, a specific transversally cross-sectional width of the semi-finished product are gradually and transversally widened to finalize a formation of a three-dimensional paper-molded product having zero-draft angles, thereby enhancing a structural strength of the entire product, shortening its manufacturing time and saving its manufacturing cost.
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