US3276672A - Bag - Google Patents

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Publication number
US3276672A
US3276672A US423695A US42369565A US3276672A US 3276672 A US3276672 A US 3276672A US 423695 A US423695 A US 423695A US 42369565 A US42369565 A US 42369565A US 3276672 A US3276672 A US 3276672A
Authority
US
United States
Prior art keywords
tube
end edge
wall
bowed
bag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US423695A
Other languages
English (en)
Inventor
Milton J Heimos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amcor Flexibles North America Inc
Original Assignee
Bemis Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bemis Co Inc filed Critical Bemis Co Inc
Priority to US423695A priority Critical patent/US3276672A/en
Priority to GB53525/65A priority patent/GB1117423A/en
Priority to BE674782D priority patent/BE674782A/xx
Application granted granted Critical
Publication of US3276672A publication Critical patent/US3276672A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/007—Details of, or accessories for, sacks or bags for facilitating the separation of the two walls, e.g. walls of inequal height, tabs; for maintaining the mouth of the sack or bag open
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents

Definitions

  • FIG. l is a view diagrammatically illustrating certain steps in the method of mannfactnring bags according to this invention.
  • FIG. 2 is a view in elevation of a bag of this invention manufactured according to the FIG. 1 method.
  • FIG. 3 is a section taken on line -3-3 of FIG. 2, the bag wall thickness being exaggerated.
  • FIG. 1 of the -drawings there is indicated at 1 a continuous web of flexible sheet plastic material, such as heavy-duty polyethylene. This is shown as being fed forwa-rd to the right, as indicated by the arrow.
  • lines of weakness such as indicated at 3 are formed therein extending transversely across the web spaced at bag length intervals. In accordance with this invention, each such line is slightly bowed in the same direction (slightly bowed toward the left as viewed in FIG. l).
  • the lines of weakness may be conventionally formed as lines of perforations across the web. As shown in FIG.
  • each line of weakness may be formed as an arc of a circle having a relatively long radius of curvature in relation to the bag length interval such, for example, that the oifset from the chord -of the arc (i.e., the line joining the points of intersection of the arc with the side edges of the web) to the center of the are is from about one-eighth to threeeighths of an inch.
  • the web As the web is fed forward, and after the lines of weakness 3 have been -formed therein, it is formed into fiat tubing as indicated at 5 in FIG. 1 with a longitudinal tube seam (a so-called back seam) indicated at 7 by folding over side portions 9 and 11 of the web on fold lines as indicated at l13 and 15 to bring the side margins 17 and 19 of the web into overlapping relation and securing said side margins together.
  • This securement is conventionally by -a seal -on a line extending throughout the length of the seam, and may be made, for example, by extrndng a bead of molten plastic (e.g., polyethylene) to come between the overlapping margins and squeezing the margins to cause them to become se-aled together.
  • molten plastic e.g., polyethylene
  • the resultant tubing 5 has the original lines of weakness 3 spaced at bag length intervals therealong, but,
  • each original line of -weakness extends transversely across the unseamed wall 21 of the tubing slightly bowed in one direction (toward the left as viewed in FIG. 1) and the remaining portions 3b and 3c of each original line of weakness form a line extending transversely across the seamed wall 2-3 of the tubing slightly bowed in the opposite direction.
  • the tubing 5 is nltimately snapped apart on the lines of weakness to form individual bag tnbes, one of which is illnstrated in FIGS. 2 and 3 and designated 25, and this is closed at one end as indicated at 27 and left open at the other to form an open-month bag.
  • the bag in effect comprises a generally rectangular segment of the flexible sheet plastic material having side edges (the side edges of the web) and first and second end edges at 3. The side edges are straight and parallel to another. The first end edge is bowed slightly ou-tward from corner-to-corner of the segment and the second end edge is bowed slightly inward from corner-to-corner of the segment, the bow of the second end edge being the reverse of the bow of the first end edge.
  • the segment is formed into the fiat tube 25 with longitudinal seam 7 in one wall 29 of the bag (which is conventionally -referred to vas the back wall).
  • one wall 29 of the bag which is conventionally -referred to vas the back wall.
  • the edge 37 (which corresponds to a line 3b, 30) of the back wall is bowed slightly ontward and the edge 3-9 (which corresponds to a line Sa) of the front wall is bowed slightly inward.
  • the closure at 27 is formed by sealing the front and back walls together along a line of seal extending transversely across the bag immediately inward of the inwardly bowed edge 39.
  • each completed bag at the month end the front wall 35 projects slightly beyond the end edge 31 of the back wall, the extension being designated 41 in FIGS. 2 and 3.
  • This extension 41 is sufiicient to be taken between the thnmb and the fingers for facilitating the opening of the bag at its month preparatory to filling the bag.
  • its month end is closed, as by a seal similar to the seal at 27, made immediately inward of the inwardly bowed edge 31 at the month.
  • a bag comprising a generally rectangnlar seg-ment of fiexible sheet plastic material having side edges and first and second end edges, the side edges being straight and parallel to one another, bowed segment, the second end edge being bowed slightly in- Ward from corner-to-corne-r of the segment, the bow of the second end edge being the reverse of the bow of the first end edge, said segment being folded on fold lines extending parallel to its side edges into a fiat tube and having its side margins overlapping and sealed together to form a longitudinal searn, said tube having opposed Walls integrally joined at the sides of lthe tube along said fold lines, said longitudinal seam eXtending lengthwise of one of said Walls, the end edge of one wall of the tube at one end of the tube being bowed slightly outward and the end edge of the other wall of the tube at said one end of the tube being bowed slightly inwa-rd, the end edge of said one wall of the tube at the other end of the tube being bowed slightly inward and the end edge of said
  • the first end edge being slightly outward from corner-to-corner of thewall of the bag which has the outwardly bowed end edge at said mouth end projecting slightly beyond the other Wall to facilitate Opening of the mouth of the tube.
  • each of the end edges of said segment is formed generally as an arc of a circle having a relatively long radius of curvature in relation to the distance between said end edges such that the otset from the chord line joining the points of in-tersection of the are With the side edges of said segment to the center of the arc is from about one-eighth to three-eighths of an inch.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
US423695A 1965-01-06 1965-01-06 Bag Expired - Lifetime US3276672A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US423695A US3276672A (en) 1965-01-06 1965-01-06 Bag
GB53525/65A GB1117423A (en) 1965-01-06 1965-12-16 Flat plastics bags and their manufacture
BE674782D BE674782A (US20030199744A1-20031023-C00003.png) 1965-01-06 1966-01-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US423695A US3276672A (en) 1965-01-06 1965-01-06 Bag

Publications (1)

Publication Number Publication Date
US3276672A true US3276672A (en) 1966-10-04

Family

ID=23679861

Family Applications (1)

Application Number Title Priority Date Filing Date
US423695A Expired - Lifetime US3276672A (en) 1965-01-06 1965-01-06 Bag

Country Status (3)

Country Link
US (1) US3276672A (US20030199744A1-20031023-C00003.png)
BE (1) BE674782A (US20030199744A1-20031023-C00003.png)
GB (1) GB1117423A (US20030199744A1-20031023-C00003.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904092A (en) * 1988-10-19 1990-02-27 Mobil Oil Corporation Roll of thermoplastic bags
US4931033A (en) * 1989-02-01 1990-06-05 Equitable Bag Co., Inc. Plastic bag construction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54123213U (US20030199744A1-20031023-C00003.png) * 1978-02-10 1979-08-29

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2220874A (en) * 1937-10-20 1940-11-05 Harry F Waters Method for the manufacture of containers
US2265075A (en) * 1939-12-06 1941-12-02 Thomas M Royal & Company Method of making bags
US2735215A (en) * 1956-02-21 rutledge
US3077410A (en) * 1959-06-08 1963-02-12 Amos R Kanaga Portion control holding bag or container
US3104797A (en) * 1963-09-24 Langenfeld
US3113715A (en) * 1961-02-03 1963-12-10 Dow Chemical Co Anti-block edge for plastic bags and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735215A (en) * 1956-02-21 rutledge
US3104797A (en) * 1963-09-24 Langenfeld
US2220874A (en) * 1937-10-20 1940-11-05 Harry F Waters Method for the manufacture of containers
US2265075A (en) * 1939-12-06 1941-12-02 Thomas M Royal & Company Method of making bags
US3077410A (en) * 1959-06-08 1963-02-12 Amos R Kanaga Portion control holding bag or container
US3113715A (en) * 1961-02-03 1963-12-10 Dow Chemical Co Anti-block edge for plastic bags and the like

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904092A (en) * 1988-10-19 1990-02-27 Mobil Oil Corporation Roll of thermoplastic bags
US4931033A (en) * 1989-02-01 1990-06-05 Equitable Bag Co., Inc. Plastic bag construction

Also Published As

Publication number Publication date
BE674782A (US20030199744A1-20031023-C00003.png) 1966-07-06
GB1117423A (en) 1968-06-19

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