FOLDING STRUCTURE FOR A PLASTIC PLURAL-SHEET STATIONARY
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United States of America Patent
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Issued Date -
Oct 19, 2023
app pub date -
Apr 19, 2022
filing date -
Apr 19, 2022
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Abstract
A plastic plural-sheet stationary includes plural plastic sheets that are superimposed on one another. The plastic plural sheets includes at least two element sheets made of plastic. The outermost element sheet includes a folding edge. Two first fusion lines are provided to securely connect the plural plastic sheets formed by the superimposed element sheets through fusion. The two first fusion lines are located on two sides of the folding edge. A spacing between the two first fusion lines is greater than twice a superimposed thickness of the plural plastic sheets. Thus, although a corrugation area is generated when the plural plastic sheets are folded along the folding line, the corrugation area is restricted between the two first fusion lines to maintain the region outside of the two first fusion lines smooth, avoiding outward spread of the corrugation area.
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