Plastic Bag and Plastic Bag Making Apparatus

Patent metadata

Field	Value
Publication number	US-2019062001-A1
Application number	US-201816175982-A
Country	US
Kind code	A1
Filing date	Oct 31, 2018
Priority date	Jul 24, 2015
Publication date	Feb 28, 2019
Grant date	—

Abstract

In a plastic bag including a triangular flap which has a folded hypotenuse and an open hypotenuse, a flow path is formed by the folded hypotenuse or the open hypotenuse to discharge air or gas through the flow path.

First claim

1 - 9 . (canceled)

10 . An apparatus for making plastic bags successively, comprising:
a panel feeder by which two webs of panel material are superposed with each other and fed longitudinally thereof and intermittently; a side gusset supply by which a web of side gusset material is supplied to one of the webs of panel material and cut into a sheet of side gusset material after being folded into halves whenever the webs of panel material are fed intermittently, the sheet of side gusset material being disposed widthwise of and interposed between the webs of panel material, the sheet of side gusset material having a folded inner edge and open outer edges, the sheet of side gusset material further having opposite end portions; a side gusset folder by which one of the opposite end portions of the sheet of side gusset material is folded obliquely along a folded line as it is folded into halves after or before the sheet of side gusset material is supplied so that a triangular flap is formed by the end portion to be shaped into a triangle having a base formed by the folded line, the sheet of side gusset material further having opposite end edges, the triangle having an apex formed by an intersection between one of the opposite end edges and the folded inner edge of the sheet of side gusset material, the triangular flap further having a folded side formed by the folded inner edge, the triangular flap further having an open side formed by the end edge, a heat seal device by which the webs of panel material, the sheet of side gusset material and the triangular flap are heat sealed with each other widthwise of the webs of panel material whenever the webs of panel material are fed intermittently; and a cutter by which the webs of panel material are cut widthwise thereof into sheets of panel material whenever being fed intermittently to make plastic bags successively of the sheets of panel material and the sheet of side gusset material, the apparatus being characterized by a flow path formed by the folded side or the open side when making the plastic bags successively, to discharge air or gas through the flow path.

11 . A method of making plastic bags successively, comprising:
making two webs of panel material superposed with each other and fed longitudinally thereof and intermittently; making a web of side gusset material supplied to one of the webs of panel material and cut into a sheet of side gusset material after being folded into halves whenever the webs of panel material are fed intermittently, the sheet of side gusset material being disposed widthwise of and interposed between the webs of panel material, the sheet of side gusset material having a folded inner edge and open outer edges, the sheet of side gusset material further having opposite end portions; making one of the opposite end portions of the sheet of side gusset material folded obliquely along a folded line as it is folded into halves after or before the sheet of side gusset material is supplied so that a triangular flap is formed by the end portion to be shaped into a triangle having a base formed by the folded line, the sheet of side gusset material further having opposite end edges, the triangle having an apex formed by an intersection between one of the opposite end edges and the folded inner edge of the sheet of side gusset material, the triangular flap further having a folded side formed by the folded inner edge, the triangular flap further having an open side formed by the end edge, making the webs of panel material, the sheet of side gusset material and the triangular flap heat sealed with each other widthwise of the webs of panel material whenever the webs of panel material are fed intermittently; and making the webs of panel material cut widthwise thereof into sheets of panel material whenever being fed intermittently to make plastic bags successively of the sheets of panel material and the sheet of side gusset material, the method being characterized by making a flow path formed by the folded side or the open side when making the plastic bags successively, to discharge air or gas through the flow path.

12 . The method as set forth in claim 11 further comprising making a notch formed in the folded side of the triangular flap, the flow path being formed by the notch.

13 . The method as set forth in claim 11 further comprising making the folded line inclined at an angle larger than 45° with respect to the open outer edges of the sheet of side gusset material so that the flow path is formed by the open side of the triangular flap at a position adjacent to the intersection between the folded side and the open side of the triangular flap.

14 . The method as set forth in claim 11 further comprising making the triangular flap removed partially at a position adjacent to the intersection between the folded side and the open side to make a removed portion formed, the flow path being formed by the removed portion.

15 . The method as set forth in claim 11 further making a notch formed in the open side of the triangular flap, the flow path being formed by the notch.

Assignees

• Totani Corp

Inventors

• Totani Mikio

Classifications

• B31B2155/00

  Flexible containers made from webs · CPC title

• B31B2155/002

  by joining superimposed webs, e.g. with separate bottom webs · CPC title

• B31B70/855

  Forming valves integral with the containers · CPC title

• B31B2160/10

  rectangular and flat, i.e. without structural provision for thickness of contents · CPC title

• B31B50/81

  Forming or attaching accessories, e.g. opening devices, closures or tear strings · CPC title