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US 10,787,293 B2Granted
Multi-layer thermoplastic films and bags with enhanced light transmittance and methods for making the same
AssigneeThe Glad Products Company
InventorMichael G. Borchardt
Life of this patent
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Abstract
Implementations described herein include films with maintained or decreased light transmittance despite a reduction in gauge. In particular, one or more implementations include a multi-layer film with each layer having differing opacity agents. The combination of the two different opacity agents in two different layers can have a synergistic effect that provide decreased light transmittance. Indeed, in one or more embodiments a multi-layer film with differing opacity agents in each layer has a decreased light transmittance despite a reduction in gauge and opacity agents.
Claims5
A thermoplastic bag, comprising:
- a first layer of thermoplastic material, wherein the first layer comprises:
- first and second side walls joined along a bottom edge, a first side edge, and an opposing second side edge;
- a first plurality of alternating thicker ribs and thinner stretched webs;
- and
- a first opacity agent in a first concentration;
- a second layer of thermoplastic material, wherein the second layer comprises:
- first and second side walls joined along a bottom edge, a first side edge, and an opposing second side edge, the second layer being positioned within the first layer;
- a second plurality of alternating thicker ribs and thinner stretched webs;
- and
- a second opacity agent in a second concentration that is less than the first concentration;
- a first light transmittance in a direction through the first layer and then the second layer at a first location of the thermoplastic bag;
- and
- a second light transmittance in a direction through the second layer and then the first layer at the first location of the thermoplastic bag, wherein the first light transmittance is lesser than the second light transmittance.
10 more elements
Dependencies are inferred from the claim text.