Method of making baffled lap welded waterbed mattress bag

Details Method of making baffled lap welded waterbed mattress bag Method of making baffled lap welded waterbed mattress bag

1980-05-06

1981-12-01

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156290, 1563808, 156581, 1565834, B29C 1904

Patent

active

043034608

ABSTRACT:
Two rectangular pieces of plastic material corresponding to the top and bottom layers of the bag to be formed are placed end to end and looped to form a tube. The overlapped ends are partially welded together to leave long access slits to the tube. The incompletely formed tube is telescoped over a welding die having the same general configuration of the tube, but axially compressed. The edges of the tube openings are turned inwardly over the generally rectangular rims at opposite ends of the die. The corners of the rims are rounded so that the inwardly turned edges form a one layer continuous flange free of wrinkles. Rectangular end pieces are then lap welded to the flange. The incompletely formed waterbed mattress is removed from the die. Individual baffle structures are welded to the top and bottom layers of the bag by secondary operations in which a jig mounting a row of baffle structures projects through the tube slits to position the baffle structures during a welding operation. The jig withdraws from the now welded baffle structures. After the requisite number of rows of baffles are welded, the slits are finally closed by a lap welding process. A fully lap welded waterbed mattress bag results.

REFERENCES:
patent: 3918110 (1975-10-01), Cantillo et al.
patent: 4167432 (1979-09-01), Mollura
patent: 4172301 (1979-10-01), Everard et al.

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