Process and apparatus for winding a film web

Details Process and apparatus for winding a film web Process and apparatus for winding a film web

1990-04-02

1991-08-13

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 65, B65H 1810, B65H 1816

Patent

active

050390236

ABSTRACT:
In an interstice 6 between a film reel 8 and a contact roll 3, two air displacement rollers 5a, 5b are arranged parallel to the film reel 8 and the contact roll 3. In comparison with the contact roll and the winding core 2, these two air displacement rollers have a smaller diameter of about 7.5 to 50 mm. The rollers squeeze out the air boundary layers 4 at the film web layers 1 moving into the interstice 6. The contact roll 3 and one of the air displacement rollers 5a have a smooth hard surface layer with an average peak-to-valley height Ra of less than 0.4 microns and a Brinell hardness HB of greater than 10 HB 2.5/62.5. The distance between the two air displacement rollers and the contact point of film reel with the contact roll is chosen so small that new air boundary layers on the film web sections within the interstice can form only to a slight extent.

REFERENCES:
patent: 4576344 (1986-03-01), Sasaki et al.
patent: 4830303 (1989-05-01), Hagens et al.

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