Rectangular-bottomed packaging bag, and method for manufacturing rectangular-bottomed packaging bag

Patent metadata

Field	Value
Publication number	US-2023145096-A1
Application number	US-202117908546-A
Country	US
Kind code	A1
Filing date	Mar 25, 2021
Priority date	Mar 26, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

A rectangular-bottomed packaging bag (1) is a rectangular-bottomed packaging bag formed by folding a sheet material member and includes a rectangular shaped bottom (2) a front (3) and a rear (4) rising from two facing sides of the bottom (2), and a pair of sides (5) connecting the front (3) and the rear (4). The pair of sides (5) each include a first region (31) positioned on the front (3) side, a second region (32) positioned on the rear (4) side, a side joining portion (33) joining the first region (31) and the second region (32), and an inclined joining portion (34) inclined to the bottom (2) side from the side joining portion (33) toward one of the front (3) and the rear (4) and joining the sheet material member of the first region (31) and the second region (32) overlapping each other in a direction of thickness.

First claim

1 . A rectangular-bottomed packaging bag, which is a rectangular-bottomed packaging bag formed by folding a sheet material member, comprising:
a rectangular shaped bottom; a front and a rear rising from two facing sides of the bottom; and a pair of sides connecting the front and the rear, wherein the pair of sides each include: a first region positioned on the front side; a second region positioned on the rear side; a side joining portion joining the first region and the second region; and an inclined joining portion inclined to the bottom side from the side joining portion toward one of the front and the rear, and joining the sheet material member of the first region and the second region overlapping each other in a direction of thickness.

2 . The rectangular-bottomed packaging bag according to claim 1 , further comprising:
a bottom joining portion provided between the bottom and each of the front, the rear, and the sides, wherein an end portion of the inclined joining portion positioned on the bottom side that is connected to the bottom joining portions.

3 . The rectangular-bottomed packaging bag according to claim 1 , further comprising a fixed sealing portion which joins the side joining portion and the side.

4 . The rectangular-bottomed packaging bag according to claim 3 , wherein the fixed sealing portion is provided at an end portion of the side joining portion positioned on the bottom side.

5 . The rectangular-bottomed packaging bag according to claim 1 , wherein
the bottom includes a half-folded bottom gusset which protrudes into the bag between the front and the rear, and the side includes a half-folded side portion gusset which protrudes into the bag between the front and the rear.

6 . The rectangular-bottomed packaging bag according to claim 1 , wherein a spout is provided at an opening of the rectangular-bottomed packaging bag.

7 . The rectangular-bottomed packaging bag according to claim 1 , wherein a zipper is provided at an opening of the rectangular-bottomed packaging bag.

8 . The rectangular-bottomed packaging bag according to claim 1 , wherein a pillar seal portion in which a part of the sheet material member is fused at a constant width is provided at a portion including each of boundary lines which are boundaries between the front and the rear, and the pair of sides.

9 . The rectangular-bottomed packaging bag according to claim 1 , wherein
a pillar seal portion in which a part of the sheet material member is fused at a constant width is provided at a portion including each of boundary lines which are boundaries between the front and the rear, and the pair of sides, a zipper is provided at an opening of the rectangular-bottomed packaging bag, and the pillar seal portion is provided below the zipper.

10 . A method for manufacturing the rectangular-bottomed packaging bag described in claim 5 , comprising:
an unfolding step of unfolding a flat bag so that the front, the rear, and the pair of sides are formed from a pair of flat portions, the bottom is formed by opening the bottom gusset folded in half, and an isosceles-triangle-shaped folded portion is formed along the inclined joining portion by separating the pair of flat portions of the flat bag including the half-folded bottom gusset provided between the pair of flat portions, the side joining portion in which both end edges of the pair of flat portions are joined, the bottom joining portion in which the pair of flat portions and a circumferential edge portion forming a boundary with the bottom gusset are joined, and the inclined joining portion connecting obliquely between the side joining portion and the bottom joining portion; and a folding step of forming the bottom gusset again and forming the side portion gusset by bringing the front and the rear into close contact with each other while thrusting a pair of side portion folding plates facing the pair of sides and a bottom portion folding plate facing the bottom from an outer side of the bag toward an inner side of the bag after the unfolding step.

11 . The method for manufacturing the rectangular-bottomed packaging bag according to claim 10 , further comprising a fixed sealing step of joining the bottom joining portion formed in one of the first region and the second region, and the side joining portion in a state in which the side joining portion is sandwiched between the first region and the second region on an inner side of the side portion gusset after the folding step.

12 . The rectangular-bottomed packaging bag according to claim 2 , further comprising a fixed sealing portion which joins the side joining portion and the side.

13 . The rectangular-bottomed packaging bag according to claim 12 , wherein the fixed sealing portion is provided at an end portion of the side joining portion positioned on the bottom side.

Assignees

• Hosokawa Yoko Kk

Inventors

• Kuge Raizo
• Umenaka Kazuhiro
• Obara Sho

Classifications

• B65D31/16

  of special shape · CPC title

• B31B70/60

  Uniting opposed surfaces or edges; Taping · CPC title

• B31B2150/001

  with square or cross bottom · CPC title

• B65D75/5883

  connected to the package at the sealed junction of two package walls · CPC title

• B31B70/26

  Folding sheets, blanks or webs · CPC title