Apparatus and methods for producing shrink wrap packaging

Details Apparatus and methods for producing shrink wrap packaging Apparatus and methods for producing shrink wrap packaging

2006-04-25

2006-04-25

Tawfik, Sameh H. (Department: 3721)

Package making

Methods

Applying a partial cover

C053S412000, C053S442000

Reexamination Certificate

active

07032360

ABSTRACT:
An apparatus (10) is disclosed including a web of film (20) extending between first and second pairs of pinch rollers (12–15) and onto a vacuum table (18). A rotary cutter (46) positioned before the first pair of pinch rollers (12, 13) includes laterally extending and spaced knives (52) for creating cuts (54, 58) in the film (20) which expand into vent openings (54′) positioned over the sides (68) of the product (72) when the film (20) is wrapped around and shrunk upon the product (72). A further rotary cutter (30) positioned between the pairs of pinch rollers (12–15) includes a cut-off knife (36) and first and second blades (44). The cut-off knife (36) creates a cut (60) in the film (20) to form a single sheet of film (20) and includes notches (38) in its cutting edge to form tie strips (62) connecting the single sheet to the web of film (20). A kicker plate (84) of a rotatable tie strip breaker (80) engages the cut film (20) on the vacuum table (18) at the trailing edge and at a speed faster than the film (20) is being conveyed to place tensional force on and breaking the tie strips (62).

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