Bag making machine and method for making plastic bag

Patent metadata

Field	Value
Publication number	US-11090897-B2
Application number	US-201716317027-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Jul 14, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A web of first or second material is provided with the spout, and a plastic bag is made from side gusset materials in addition to webs of the first and second materials. An aperture is formed in the web of the first or second panel material, and the spout is inserted into and positioned with the aperture, whenever the webs of the first and second panel materials are fed intermittently. After the webs of the first and second panel materials are superposed on each other, whenever the webs of the first and second panel materials are fed intermittently, the webs of the first and second panel materials are heat sealed with each other in a longitudinal direction thereof by a longitudinal seal device, and the webs of the first and second panel materials are heat sealed with the side gusset materials in a width direction thereof by a cross seal device.

First claim

What is claimed is:

1. A bag making machine, comprising:
a panel material feed device, by which webs of a first panel material and a second panel material are superposed on each other, and fed in a longitudinal direction of the webs of the first panel material and the second panel material intermittently;
a side gusset material supply device, by which side gusset materials are supplied to the web of the first panel material or the web of the second panel material, so as to be extended in a width direction of the webs of the first panel material and the second panel material, whenever the webs of the first panel material and the second panel material are fed intermittently before the webs of the first panel material and the second panel material are superposed on each other, the side gusset materials being disposed between the webs of the first panel material and the second panel material when the webs of the first panel material and the second panel material are superposed on each other;
a spout mounting device, by which an aperture is formed in the web of the first panel material or the web of the second panel material, and a spout is inserted into and positioned with the aperture, whenever the webs of the first panel material and the second panel material are fed intermittently before the webs of the first panel material and the second panel material are superposed on each other;
a longitudinal seal device, by which the webs of the first panel material and the second panel material are heat sealed with each other in the longitudinal direction of the webs of the first panel material and the second panel material, whenever the webs of the first panel material and the second panel material are fed intermittently after the webs of the first panel material and the second panel material are superposed on each other;
a cross seal device, by which the webs of the first panel material and the second panel material are heat sealed with the side gusset materials in the width direction of the webs of the first panel material and the second panel material so as to form cross sealed portions, whenever the webs of the first panel material and the second panel material are fed intermittently after the webs of the first panel material and second panel material are superposed on each other;
an oblique seal device, by which the webs of the first panel material and the second panel material are obliquely heat sealed with the side gusset materials at a position adjacent to a longitudinal sealed portion of side edges of the webs of the first panel material and the second panel material so as to form oblique sealed portions, the longitudinal sealed portion and the cross sealed portions being connected to each other by the oblique sealed portions;
a first cutout blade, by which the longitudinal sealed portion is cut out between each of the cross sealed portions so as to form a first through portion, the longitudinal sealed portion of the side edges of the webs of the first panel material and the second panel material having a predetermined width in the width direction;
a panel material guide device, by which the webs of the first panel material and the second panel material are guided while the webs of the first panel material and the second panel material are fed, the web of the first panel material including an additional side edge, the web of the second panel material including a corresponding additional side edge, the web of the first panel material being folded at a position adjacent to the additional side edge and along a first folded line, the web of the second panel material being folded at a position adjacent to the corresponding additional side edge and along a second folded line, whereby a first folded portion being formed on the web of the first panel material, a second folded portion being formed on the web of the second panel material, then the first folded portion being superposed on the second folded portion, and the additional side edge being aligned with the corresponding additional side edge, furthermore, when the webs of the first panel material and the second panel material are folded along the first folded line and the second folded line, the additional side edge being apart from the first folded line at a distance L 1 , the corresponding additional side edge being apart from the second folded line at a distance L 2 , the distance L 1 between the additional side edge and the first folded line being longer than twice the distance L 2 between the corresponding additional side edge and the second folded line by a predetermined distance L 3 , a protruding portion being formed by the predetermined distance L 3 ;
a second cutout blade, by which the protruding portion is cut out so as to form a second through portion; and
a cutter, by which the side gusset materials in addition to the webs of the first panel material and the second panel material are cross cut in the width direction of the webs of the first panel material and the second panel material, whenever the webs of the first panel material and the second panel material are fed intermittently after being heat sealed;
wherein the web of the first panel material or the web of the second panel material is provided with the spout, and a plastic bag being made from the side gusset materials in addition to the webs of the first panel material and the second panel material;
a first handle is made from both the longitudinal sealed portion and the first through portion;
an end surface is formed by the first folded portion;
a second handle is made from both the protruding portion and the second through portion;
the side gusset materials in addition to the webs of the first panel material and the second panel material are bonded with each other by the oblique sealed portions at a position adjacent to the longitudinal sealed portion, so that oblique surfaces are formed on the webs of the first panel material and the second panel material respectively, when the plastic bag being filled with a content, and
among the oblique surfaces, one of the oblique surfaces being provided with the spout.

2. The bag making machine as set forth in claim 1 , further comprising:
guide rollers, configured to guide the web of the first panel material or the web of the second panel material to which the spout is mounted by the spout mounting device,
wherein the guide rollers are divided widthwise of the web of the first panel material or the web of the second panel material at an interval through which the spout is passed.

3. The bag making machine as set forth in claim 1 , further comprising:
a guide roller, configured to guide the web of the first panel material or the web of the second panel material to which the spout is mounted by the spout mounting device,
wherein the guide roller comprises a reduced diameter in such a manner that a diameter of the guide roller is reduced partially, and the spout is passed through the reduced diameter.

4. A method for making the plastic bag, comprising:
using the bag making machine as set forth in claim 1 .

Assignees

• Totani Corp

Inventors

• Totani Mikio

Classifications

• B31B70/04

  Feeding sheets or blanks · CPC title

• B31B2160/20

  with structural provision for thickness of contents · CPC title

• B31B70/84

  Forming or attaching means for filling or dispensing contents, e.g. valves or spouts · CPC title

• B31B70/644

  Making seals parallel to the direction of movement, i.e. longitudinal sealing · CPC title

• B65D33/08

  Hand holes · CPC title