Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-10-21
1993-11-30
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
15624414, 15624418, 156259, 156270, 156290, 53455, 53459, B29C 5308, B32B 3118
Patent
active
052661407
ABSTRACT:
A method of making a support sheet-containing plastic film pocket for use in files. A continuous thin-film tubular material formed continuously by synthetic resin inflation molding is folded at opposite sides thereof into a flat tubular sheet consisting of an upper thin-film sheet and a lower thin-film sheet. The upper thin-film sheet is cut centrally along the length thereof. Two halves of the cut upper thin-film sheet are opened, and support sheets are inserted between respective opened halves of the upper thin-film sheet and corresponding portions of the lower thin-film sheet. Cut edge portions of the upper thin-film sheet are tacked to the lower thin-film sheet. Then, the thin-film tubular material, with support sheets inserted therein, is cut to a predetermined size of a target plastic film pocket. One end resulting from this cutting is welded. Again, the cut edge portions of the upper thin-film sheet or portions adjacent thereto are welded to at least the lower thin-film sheet.
REFERENCES:
patent: 3254828 (1966-06-01), Lerner
Ball Michael W.
Crispino Richard
Kohno Fasei Co., Ltd.
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