Nancy S Cheng

US Patent:

20210276315, Sep 9, 2021

Filed:

May 26, 2021

Appl. No.:

17/331315

Inventors:

- Livingston NJ, US
Kelvin Yang - Madison NJ, US
Nancy (Lan-Shin) Cheng - Livingston NJ, US

International Classification:

B32B 27/32
B32B 7/035
C08L 23/06
B29C 48/00
B29C 48/21
B29C 48/28

Abstract:

A method of making a pre-stretched plastic packaging film comprising co-extruding a top layer, a bottom layer, and a core layer into a multilayer film intermediate product, wherein the top layer and bottom layer comprise at least about 95 wt % polyethylene resin, and the core layer comprises polyethylene resin and filler particles; stretching the multilayer film intermediate product to impart cavitation in the core layer in the area of the filler particles to form a pre-stretched polyethylene-based film; and rolling the pre-stretched polyethylene-based film onto a roller to form a roll of pre-stretched polyethylene-based film. A multilayer pre-stretched plastic packaging film comprising: a core layer sandwiched between a top layer and a bottom layer wherein the top layer and bottom layer comprise at least about 95 wt % polyethylene, and the core layer comprises filler particles having a particle size of 0.1 to 20 μm in a polyethylene-based matrix comprising at least about 95 wt % polyethylene.

US Patent:

20190202185, Jul 4, 2019

Filed:

Dec 31, 2018

Appl. No.:

16/237019

Inventors:

- Livingston NJ, US
Kelvin Yang - Madison NJ, US
Nancy (Lan-Shin) Cheng - Port Lavaca TX, US

Assignee:

Inteplast Group Corporation - Livingston NJ

International Classification:

B32B 27/32
B32B 7/035
C08L 23/06
B29C 48/00

Abstract:

A method of making a pre-stretched plastic packaging film comprising co-extruding a top layer, a bottom layer, and a core layer into a multilayer film intermediate product, wherein the top layer and bottom layer comprise at least about 95 wt % polyethylene resin, and the core layer comprises polyethylene resin and filler particles; stretching the multilayer film intermediate product to impart cavitation in the core layer in the area of the filler particles to form a pre-stretched polyethylene-based film; and rolling the pre-stretched polyethylene-based film onto a roller to form a roll of pre-stretched polyethylene-based film. A multilayer pre-stretched plastic packaging film comprising: a core layer sandwiched between a top layer and a bottom layer wherein the top layer and bottom layer comprise at least about 95 wt % polyethylene, and the core layer comprises filler particles having a particle size of 0.1 to 20 μm in a polyethylene-based matrix comprising at least about 95 wt % polyethylene.