초록 ▼

The present invention provides reclosable plastic bags that a laboratory worker wearing gloves can open safely without the use of any tool or utensil and without increasing the risk of contact between the contents of the bag and the user. The reclosable plastic bags of the present invention may be m

The present invention provides reclosable plastic bags that a laboratory worker wearing gloves can open safely without the use of any tool or utensil and without increasing the risk of contact between the contents of the bag and the user. The reclosable plastic bags of the present invention may be made from an extruded plastic bag film web that may be cut or otherwise formed into a bag comprising a first wall on which a first closure profile element is disposed and a second wall on which a second closure profile element is disposed. On either wall or both walls, below the closure profile element, the plastic film web may be formed into subsections having different thicknesses. One of the subsections may be thinner cross-section, formed of a thinner bag film web, thus creating a "tear zone" that may have a substantially linear, not substantially cross-linked, molecular alignment. A sufficient distance from the centerline of that thin subsection, on either side or both sides of the thin subsection, one or more strips may be formed of sufficient mass, weight, or strength to reduce at least partially the lateral forces that might otherwise act in or on the thin section during extrusion to cause unacceptable wrinkling of the thin section and/or surrounding sections. The present invention also provides apparatus, die assemblies, and methods for manufacturing the reclosable plastic bags of the present invention. The present invention further provides reclosable closure profiles that create a partial seal substantially preventing a closure profile element from contacting either the contents of the bag or the ambient air or moisture.

대표청구항 ▼

[ What is claimed is:] [1.]1. A reclosable bag comprising:(a) first and second wall panels, each having a top, a bottom, and first and second side edges, the bottom and first and second side edges of the first wall panel joined to the bottom and first and second side edges, respectively, of the seco

[ What is claimed is:] [1.]1. A reclosable bag comprising:(a) first and second wall panels, each having a top, a bottom, and first and second side edges, the bottom and first and second side edges of the first wall panel joined to the bottom and first and second side edges, respectively, of the second wall panel to form a bag having an openable mouth;(b) a reclosable closure adjacent the openable mouth, comprising a first closure element adjacent the top of the first wall panel and an interengaging second closure element adjacent the top of the second wall panel; and(c) an unperforated tear zone in said first wall panel, said tear zone comprising a thin section having a thickness which is less than adjacent sections of the first wall panel, and extending continuously and substantially across the first wall panel between the first and second side edges and positioned between the bottom and the closure element.