Multi-layer thermoplastic films and bags with enhanced light transmittance and methods for making the same
AssigneeThe Glad Products Company
InventorMichael G. Borchardt
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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.
Claims4
A method of manufacturing a thermoplastic film with enhanced light transmission, comprising:
- extruding a first layer of thermoplastic material having a first concentration of a light-reflecting opacity agent, the first concentration of the light-reflecting opacity agent being between about 4% and about 6%;
- extruding a second layer of thermoplastic material having a second concentration of a light-absorbing opacity agent, the second concentration of the light-absorbing opacity agent in the second layer of thermoplastic material being between 0.25% and 0.75% such that the second layer of thermoplastic material has a cloudy transparent appearance;
- incrementally stretching the first and second layers by passing the first and second layers between one or more pairs of intermeshing rollers;
- and
- discontinuously bonding the first and second layers together.
Dependencies are inferred from the claim text.