Method of making pressure sensitive adhesive tape rolls with a t

Details Method of making pressure sensitive adhesive tape rolls with a t Method of making pressure sensitive adhesive tape rolls with a t

1997-07-25

1998-05-26

Engel, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156187, 242520, B65H 1800

Patent

active

057559058

ABSTRACT:
The method of the present invention provides a way to make rolls of high shear strength pressure sensitive adhesive tapes with a transparent to the core appearance in a relatively short time and without the need to subject the rolls to additional method steps. Moreover, the present invention achieves such transparent to the core appearance by sufficiently wetting-out the adhesive on the tape backing to remove microscopic air bubbles entrapped within the harder and less deformable high shear strength adhesive layers. The method comprises a rewinding method and is characterized by the use of a pack roll during rewinding to provide a sufficiently high contact pressure to the non-adhesive side of the tape substantially at the application point of the tape to the tape roll. In one aspect, a sufficient contact pressure is provided by the pack roll so that the pressure sensitive adhesive tape rolls are made with a transparent to the core appearance at the time of the rewinding step. In another aspect, the method further includes the step of aging the tape roll after the rewinding step is complete for allowing the tape roll to become transparent to the core after the rewinding step.

REFERENCES:
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Brochure entitled "NG 210" from Guzzetti s.p.a., Italy (no date).
"Slitting" (Chapter 37) in Handbook of Pressure Sensitive Adhesives, edited by Donatas Satas, 2nd ed., copyright 1989, pp. 885-890.
Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics, ASTM Designation D1003-61 (Reapproved 1988), 6 pages.
Standard Test Method for Holding Power of Pressure-Sensitive Tape, ASTM Designation D3654-88, 4 pages.

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