Packaging bag

Patent metadata

Field	Value
Publication number	US-9850032-B2
Application number	US-201414771082-A
Country	US
Kind code	B2
Filing date	Feb 19, 2014
Priority date	Feb 28, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

Provided is a packaging bag which can prevent a colorant contained in a multilayer film from staining a packaged object, as well as has high mechanical strengths such as high impact resistance and high pinhole resistance. In a packaging bag formed by forming a multifold film into a bag shape, the multifold film being formed by stacking a plurality of multilayer films, a colorant is contained in a layer of the multilayer films, the layer containing the colorant being not in contact with an object to be packaged. For example, the multifold film comprises two stacked multilayer film formed by flattening a tubular multilayer film. For example, the colorant is an inorganic pigment.

First claim

The invention claimed is:

1. A packaging bag comprising:
forming a multifold film into a bag shape, the multifold film being formed by stacking a plurality of multilayer films,
wherein a colorant is contained in a layer of the multilayer films, the layer containing the colorant being not in contact with an object to be packaged,
wherein the packaging bag is formed using envelope sealing,
wherein the multifold film has an inner multilayer film and an outer multilayer film, and
wherein an unbonded surface is provided between the inner multilayer film and the outer multilayer film,
wherein the inner multilayer film and the outer multilayer film are composed of a plurality of layers,
wherein a colorant is contained in at least one layer except for an innermost layer of the plurality of layers of the inner multilayer film, and
wherein a colorant is contained in at least one layer except for an outermost layer of the plurality of layers of the outer multilayer film,
wherein the inner multilayer film and the outer multilayer film are connected to each other at edge portions in the width direction, and formed by flattening a tubular multilayer film,
wherein one edge portion of the width direction of the multifold film and the other edge portion of the width direction of the multi-layer film are bonded together in such a manner that the one edge portion and the other edge portion are stacked, so as to form a tubular shape with the inner multilayer film inside,
wherein a longitudinal seal is formed in the region in which the one edge portion and the other edge portion are stacked,
wherein containing space is formed by the inner multilayer film, and
wherein the colorant is contained in only an innermost layer of the tubular multilayer.

2. The packaging bag of claim 1 , wherein the colorant is an inorganic pigment.

Assignees

• Kyoraku Co Ltd

Inventors

• Uesugi Tomohiro
• Matsunaga Shinji

Classifications

• B65D33/16

  End- or aperture-closing arrangements or devices (valves of valve bags {B65D31/14}; closures of filled bags B65D77/10) · CPC title

• B65D31/04

  with multiple walls (B65D81/3881 takes precedence; for shock absorbing purposes B65D81/03) · CPC title

• B65D31/02 Primary

  with laminated walls · CPC title

• B65D35/08

  from plastics material · CPC title

• B65D33/004

  Information or decoration elements, e.g. level indicators, detachable tabs or coupons · CPC title