Title: Method for forming containers with fin-type seams

Abstract: A conventional fin-type seam formed on tubed bag forming sheet material provided on one face with heat sealable material, has heat sealed overlapping edge portions forming the seam. The fin slides over a back-up plate extending between it and the body of the tube to prevent scuffing of the heat sealable material with consequent seal failure. A tracking wheel engaging the fin presses it against the back-up plate, and maintains alignment.

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Inventors: Rucker, George I. (Dublin, CA, US)

Application Number: 520437
Filing Date: 1974-11-04
Publication_date: 1976-01-27
Assignee: Crown Zellerbach Corporation (San Francisco, CA)
Primary Class(es): 156/203 53/451, 53/545, 53/551, 156/466, 493/205, 493/302
Other Classes:
US Patent Ref:

2277288	Mar, 1942	Berch	53/46.
2385897	Oct, 1945	Waters	53/128.
3399094	Aug, 1968	Skoggard et al.	156/466.
3816043	Jun, 1974	Snelling et al.	425/112.

Other Refs:
Primary Examiner: Powell, William A.
Assistant Examiner: Simmons, David A.
Attorney: Lampe; Thomas R., Horton; Corwin R.