Stock material or miscellaneous articles – Hollow or container type article – Nonself-supporting tubular film or bag
Patent
1995-11-06
1998-05-05
Dye, Rena
Stock material or miscellaneous articles
Hollow or container type article
Nonself-supporting tubular film or bag
428 355, 428100, 428133, 428138, 24586, 24587, 24589, 383 61, 383 63, B32B 306, B65D 3316
Patent
active
057471266
ABSTRACT:
A reclosable bag is formed of a first wall and a second wall of a polymeric sheet material joined to form an enclosure with a mouth defined by the wall edges. The bag has a closure for selectively opening and sealing the mouth. The closure includes a first and a second mutually interlocking profile, each of which extends along and is bonded to the internal surface of its respective first and second wall. The first and second mutually interlocking profiles are extruded from a first polymeric resin material, and have a web portion which is bonded to the wall. Coextruded onto the web portions, or applied to the web portions following the extrusion of the strips, is at least one rib of a second polymeric resin material which includes an ultraviolet-light-excitable tracer material. The second polymeric resin material has a lower melting point than the first polymeric resin material, and is used to bond the profiles to the sheet material of the walls. Before such bonding, the ribs appear as discrete lines under ultraviolet light. After a complete bonding, the ribs disappear and are replaced by a smeared brightening of the region between the profiles and the sheet material of the walls. The appearance of ribs after bonding indicates an unsuccessful bonding operation that could possibly lead to an increase in the occurrence of leaking packages.
REFERENCES:
patent: 4673383 (1987-06-01), Beutsen
patent: 5216787 (1993-06-01), Custer et al.
patent: 5242516 (1993-09-01), Custer et al.
patent: 5403094 (1995-04-01), Tomic
patent: 5486051 (1996-01-01), May
patent: 5489252 (1996-02-01), May
patent: 5566429 (1996-10-01), Martinez et al.
Erden Donald Van
Malin Art
Dye Rena
Illinois Tool Works Inc.
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