Sealing blades for a shrink wrapping process

Details Sealing blades for a shrink wrapping process Sealing blades for a shrink wrapping process

1984-01-20

1985-12-24

Culver, Horace M.

Package making

Apparatus for contraction of cover by stretching or shrinking

By heat shrinking

53373, 53548, 156515, 1565831, B65B 5114, B65B 5130

Patent

active

045597642

ABSTRACT:
Improved set of sealing blades are for a shrink warpping process of the type wherein a plurality of the objects are advanced in spaced relationship along with and between two long sheets of heat-shrinkable polyethylene. A first set of sealing blades and a second set of the sealing blades respectively join the two sheets at a trailing side of one of the objects and at a leading side of an adjacent object. The two sheets are cut by a cutting blade between the first set of sealing blades and the second set of sealing blades to temporarily retain each of the objects between the two sheets prior to the polyethylene being heated to cause shrinkage thereof for sealing the object within the polyethylene. The improvement includes the first set of sealing blades having mating V-shaped sealing surfaces with bases thereof adjacent the cutting blade and legs thereof extending toward opposite sides of the one object. The second set of sealing blades has mating V-shaped sealing surfaces with bases thereof adjacent the cutting blade and legs thereof extending toward opposite sides of the adjacent object.

REFERENCES:
patent: 3025649 (1962-03-01), Stuhlman
patent: 3053723 (1962-09-01), Plach et al.
patent: 3513629 (1970-05-01), Hoagland et al.
patent: 3558406 (1971-01-01), Kugler

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