Bead forming apparatus and method

Details Bead forming apparatus and method Bead forming apparatus and method

1975-12-03

1977-07-26

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

4172, 156222, 156245, 156267, 156306, 156500, 156583, 264229, 264248, 425500, 428 66, 428192, B32B 3100

Patent

active

040381196

ABSTRACT:
Apparatus and method for forming a bead on the border of a swimming pool liner or similar article of plastic sheet material. The plastic sheet is located so that a portion of the border thereof underlies the elongate heat sealing member of a heat sealing apparatus. An elongate strip of bead material is dispensed beneath the heat sealing member and underneath the border of the plastic sheet underlying the member so that the border overlaps the strip. The outer edge of the bead material is compressed by engaging it with a transverse moving member adjacent the edge of the border to provide curvature to the material. The heat sealing member is then motivated downwardly into contact with the portion of the border of the plastic sheet underlying the member to heat seal the border to the bead material. The curvature of the bead material provides excess sheet material where the heat sealing takes place to minimize the formation of a tear line between the bead material and the plastic sheet.

REFERENCES:
patent: 1642847 (1927-09-01), Emanuele
patent: 2804419 (1957-08-01), De Woskin et al.
patent: 3066064 (1962-11-01), Pommer
patent: 3177501 (1965-04-01), Kwake
patent: 3283052 (1966-11-01), Munk

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