Bag body and method for manufacturing bag body
AssigneeIdemitsu Unitech Co., Ltd.
InventorTakumi Todaka
Life of this patent
Estimating the term…
Abstract
A bag includes: a bag body at least having a first surface and a second surface facing each other with a storing space formed between the first surface and the second surface; and a tape member provided between the first surface and the second surface and defining one side of the storing space. The tape member includes, in a cross section, a first portion formed of a first resin composition and a second portion formed of a second resin composition different from the first resin composition. The first portion is bonded to both the first surface and the second surface at a first section of a longitudinal direction of the tape member while bonded to only the second surface at a second section of the longitudinal direction, and the second portion is bonded to the first surface at the second section.
Claims21
A bag comprising:
- a bag body at least having a first surface and a second surface facing each other with a storing space formed between the first surface and the second surface;
- and
- a tape member provided between the first surface and the second surface and defining one side of the storing space, a cross section of the tape member comprising a first portion formed of a first resin composition and a second portion formed of a second resin composition different from the first resin composition, wherein
- the first portion is bonded to both the first surface and the second surface at a first section of a longitudinal direction of the tape member while bonded only to the second surface at a second section of the longitudinal direction,
- the second portion is bonded to the first surface at the second section, and
- a melting point of the first resin composition is higher than a melting point of the second resin composition by 10 degrees C. or more, and
- wherein the first resin composition comprises homopolypropylene when the second resin composition comprises a mixture of low-density polyethylene and polypropylene or a mixture of linear low-density polyethylene and polypropylene, or
- wherein the first resin composition comprises random polypropylene when the second resin composition comprises m-linear low-density polyethylene.
A bag comprising:
- a bag body at least having a first surface and a second surface facing each other with a storing space formed between the first surface and the second surface;
- and
- a tape member provided between the first surface and the second surface and defining one side of the storing space, a cross section of the tape member comprising a first portion formed of a first resin composition and a second portion formed of a second resin composition different from the first resin composition, wherein
- the first portion is bonded to both the first surface and the second surface at a first section of a longitudinal direction of the tape member while bonded only to the second surface at a second section of the longitudinal direction,
- the second portion is bonded to the first surface at the second section, and
- wherein a bonding strength between the first portion and the second portion is lower than a bonding strength between the first portion and each of the first surface and the second surface.
Dependencies are inferred from the claim text.