Method for manufacturing an air permeable composite film
OwnerIrene Lininventor
Life of this patent
Estimating the term…
Abstract
A method for manufacturing a novel air permeable composite film is disclosed. The air permeable composite film has a polymer layer with a top face and a bottom face and a sealing layer covering the top face. The polymer layer is first perforated by virtue of an impression process to form a plurality of tiny gaps in it for air permeation. Then the sealing layer is coated on the top face of the polymer layer to fill the gaps. The differential pressure between the top face and bottom face of the polymer layer enlarges the gaps and makes the gaps become air permeable.
Claims20
A method of manufacturing an air permeable packaging bag, the method comprising:
- providing a polymer composite layer, the polymer composite layer comprising a first part and a second part;
- performing an impression process to form a plurality of gaps on thepolymer composite layer, each of the gaps comprising two edges in contact with each other to form a closed gap when a pressure difference between the two sides of the composite film is approximately zero wherein when the pressure difference between the two sides of the composite film increases,each of the gaps are enlarged by the air pressure exerted on one side of the composite film and become air permeable, and restore again while the pressure difference is removed;
- folding the polymer composite layer to overlap the first part against the second part;
- and
- performing a sealing process to seal the overlapping edge of the first part and second part so as to form an opening of the air permeable packaging bag.
A method of manufacturing an air permeable packaging bag, the method comprising:
- providing two polymer composite layers, at least one of the two polymer composite layers comprising a plurality of gaps formed by virtue of an impression process;
- overlapping the two polymer composite layers;
- and
- performing a sealing process to seal the overlapping edge of the two polymer composite layers so as to form an opening of the air permeable packaging bag.
The method of claim 11 wherein the method further comprises a step of forming a sealing layer on the surface of the polymer composite layer.
The method of claim 11 wherein the polymer composite layer contains one or more layers each made by one of the following materials:
- acrylic resins, polyester, polyethylene (PE), polypropylene (PP), copolymer of PE and PP, ethylene-styrene copolymer (ES), cyclo olefin, polyethylene terephthalate (PET), polyvinyl alcohol (PVA), ethylene-vinyl acetate (EVA), ethylene/methacrylic acid (E/MAA)ionomer, polyethylene naphthalate (PEN), poly ether ether ketone (PEEK), polycarbonate (PC), polysulfone, polyimide (PI), polyacrylonitrile (PAN), styrene acrylonitrile (SAN), polyurethane (PU), synthetic papers, glassine papers, or polyolefin coated paper.
The method of claim 11 wherein at least two overlapping edges are sealed in the sealing process so as to form an opening in the air permeable packaging bag.
The method of claim 11 wherein at least one curving edge is sealed in the sealing process as to form an opening in the air permeable packaging bag.
The method of claim 11 wherein the sealing process is performed using a heat activating process, an ultrasonic pressing process, or an adhesive.
The method of claim 11 wherein the method of closing the opening of the air permeable packaging bag uses a zipper, a ziplock, a sliding zipper, a heat activating process, an ultrasonic pressing process, or an adhesive.
Dependencies are inferred from the claim text.