US3378189A - Plastic sack - Google Patents
Plastic sack Download PDFInfo
- Publication number
- US3378189A US3378189A US577492A US57749266A US3378189A US 3378189 A US3378189 A US 3378189A US 577492 A US577492 A US 577492A US 57749266 A US57749266 A US 57749266A US 3378189 A US3378189 A US 3378189A
- Authority
- US
- United States
- Prior art keywords
- sack
- weld
- mouth
- gusset
- plastic
- 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
Links
Images
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
- B65D33/01—Ventilation or drainage of bags
-
- 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
- B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
-
- 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
- B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
-
- 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
- B65D31/14—Valve bags, i.e. with valves for filling
- B65D31/147—Valve bags, i.e. with valves for filling the filling port being provided in a side wall
Definitions
- an air vent comprising a perforation through the sack wall is provided in conjunction, ⁇ with at least one of said welds in a corner portion of an outwardly directed pleat, the position of the air vent andthe shape of the weld being such that the weld is adaptedgto screen the air vent from the contents of the sack but to allow the passage of air from the sack interior to the air vent.
- FIGURE 1 is a side view of one side of the gusseted sack provided with a weld in one corner portion;
- the weld 31 may follow a straight line or may be a spot weld between the film layers, or more than one weld may be provided. It is preferred, however, that the weld be of a rounded configuration, for example crescent shaped or arc shaped, or substantially semi-circular, since this distributes strains around the weld; considera-ble strains may be imposed upon the weld when the sack is being filled.
- the sacks of this invention may be used for packing any materials, but are especially useful for packing powdered or granular materials, for example fertilizers, plastic granules, cement, salt, feeding stuffs.
- Polythene and poly ⁇ vinyl chloride heavy duty films are widely used for mak- 3. ing sacks for such applications, and the sacks of this invention may readily be made from these materials' and also from other plastic films, for example from films of other polyolelines, for example polypropylene.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
Description
April 16, 1968 R. w. DlcKsoN PLASTIC SACK Filed Sept. 6, 1966 FIG. l
United States Patent O 3,378,189 l PLASTIC SACK Robert Walker Dickson, Welwyn Garden City, England, assgnor to British Visqueen Limited, London, England Filed Sept. 6, 1966, Ser. No. 577,492
Claims priority, application Great Britain, Sept. 6, 1965,
1 Claim. (Cl. 229-53) ABSTRACT OF THE DISCLOSURE A plastic sack of the type having side gussets infolded Ibetween the sides of the opposed walls of the sack, the sack being adapted to assume a block ended shape when it is lled and closed by a straight seam across its mouth, at least one of the outwardly directed pleats formed by the gussets at each side of the mouth of the sack being provided with a weld of rounded configuration between the gusset and the sack wall facing it.
This invention relates to a gusseted plastic sack.
In closing filled gusseted plastic sacks by bringing the opposite sides of the mouth of the sack together with the gusset portion folded between them, and joining the edges together, usually by heat sealing, it is often difficult to locate the gusset folds in the distended mouth of the sack. This frequently causes delay in the sack closing operation, thus adding to costs.
The present invention provides a means by which the sack closing operation may be facilitated.
The invention provides a plastic sack of the type having side gussets infolded between the sides of the opposed walls of the sack, the sack thus being adapted to assume a `block ended shape when it is filled and closed by a straight seam across its mouth, with the ends of the out wardly directed pleats formed by the gusset and the sack walls providing, at each side of the block end, corners that are normally empty of the sack contents and lie substantially flat against the end of the sack, in which at least one of said outwardly directed pleats at each side of the mouth of the sack is provided with a weld between the gusset and the sack wall facing it, in the portion of the pleat that is destined to form one of said empty corners.
It will be appreciated that although the major portion of the empty corners will normally lie substantially at against the end of the sack, a small portion of the corners will be included in the upstanding seam that Ais formed whentthe mouth ofthe sack is closed. The welds provided in the corner portions in accordance with the invention may be wholly included in this seam, although it is preferred that they extend to, or are =wholly located, below the normal seaming line, since the gusset folds are more clearly located when the weld is well spaced from the top edge of the sack.
Welds may be provided in all four corner portions of the sack mouth, so that all the gusset folds are positively located. However, the provision of only one weld at each side of the mouth of the sack, preferably in adjacent pleats (front or 'back), but alternatively in diagonally opposite pleats, is found to give a great improvement in the ease of closing the sack. Such an arrangement is in fact generally preferred, for it provides the lesser restriction in the width of the sack mouth and thus allows the sack to be more easily filled. It is generally preferred that the arrangement of the welds is not such that all four of the outwardly directed pleats are wholly prevented from opening to contribute to the opening of the sack mouth. However, all four of the pleats may quite satisfactorily be provided with welds that stop short of the inwardly diice rected folds of the gussets, without impossing an undue restriction on the opening of the sack mouth.
In accordance with a further feature of the invention, an air vent comprising a perforation through the sack wall is provided in conjunction,` with at least one of said welds in a corner portion of an outwardly directed pleat, the position of the air vent andthe shape of the weld being such that the weld is adaptedgto screen the air vent from the contents of the sack but to allow the passage of air from the sack interior to the air vent.
One preferred form of the invention will now be more particularly described =by way of example with reference to the accompanying drawingsgsrfin which:
FIGURE 1 is a side view of one side of the gusseted sack provided with a weld in one corner portion; and
FIGURE 2 is a plan of the end of such a sack after it has been filled and sealed.
In these figures: 1
1 and 2 represent the said outwardly directed pleats at one side of the sack; 3 is a Acrescent-shaped weld between the two thicknesses of pleat 1 of the gusset, in the portion destined to form the empty corner AEC, shown in FIG- URE 2, when the sack has been filled and closed; and 4, in FIGURE 2, is the straight seam closing the mouth of the filled sack. 5 shows a position at which an air vent may be provided if desired.
Various modifications may be made in the sack partic ularly described. For example, the weld 31, particularly when no air vent is provided, may follow a straight line or may be a spot weld between the film layers, or more than one weld may be provided. It is preferred, however, that the weld be of a rounded configuration, for example crescent shaped or arc shaped, or substantially semi-circular, since this distributes strains around the weld; considera-ble strains may be imposed upon the weld when the sack is being filled.
The air vent perforation, if provided, need be no larger than a pinhole puncture through the wall of the sack, and this puncture may penetrate both walls of the pleat, so that the corner portion contains two perforations. The fact that the corner portion remains empty of contents, with the Walls of the pleat flattened together, provides that this perforated portion will act as a self closing valve to allow the escape of air from inside the sack Iwhen the pressure therein is above atmospheric pressure, but to be closed by pressure of the atmosphere on the film layers when the inside pressure falls below atmospheric pressure.
As stated hereinbefore, in this embodiment of theA in vention the perforation or perforations are screened from the contents of the sack by the weld between the walls of the pleat on the side of the perforations nearer to the contents of the sack, the weld however leaving an air channel between the said walls from the interior of the sack to the perforation. A crescent shaped, arc shaped, or substantially semicircular weld is again preferred, for the reason that it then more effectively shields the air vent from the contents of the sack.
When a crescent shaped, arc shaped, or substantially semicircular weld is provided to shield the vent in this embodiment of the invention, the distance of the ends of the weld from the edge fold is preferably a maximum consistent with none of the contents of the sack (fertilizer granules, for example) passing into the area containing the vent hole. Generally a separation of from 1A to inch between the ends of the weld and the edge fold gives high security combined with ease of venting.
The sacks of this invention may be used for packing any materials, but are especially useful for packing powdered or granular materials, for example fertilizers, plastic granules, cement, salt, feeding stuffs. Polythene and poly` vinyl chloride heavy duty films are widely used for mak- 3. ing sacks for such applications, and the sacks of this invention may readily be made from these materials' and also from other plastic films, for example from films of other polyolelines, for example polypropylene.
I claim:
1. In a plastic sack of the type having side gussets infolded between the sides of the opposed walls of the sack, the sack thus being adapted to assume a [block ended shape when it is filled and closed by a straight seam across its mouth, with the ends of the outwardly directed pleats formed by the gusset and the sack walls providing, at each side of the block end, corners that are normally empty of the sack contents and lie substantially flat against the end of the sack, the improvement consisting in that at least one of said outwardly directed pleats at each side of the mouth of the sack is provided with a weld of rounded configuration between the gusset and the sack wall facing it, in the portion of `the pleat that is destined to form one of said empty corners, but at least a part of at least one of said outwardly directed pleats at each side of the mouth is left free to open to contribute to the opening of the sack mouth.
References Cited UNITED STATES PATENTS DAVID M. BOCKENEK, Primary Examiner.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3797765 | 1965-09-06 | ||
GB37978/65A GB1152463A (en) | 1965-09-06 | 1965-09-06 | Plastics Gusseted Sack |
Publications (1)
Publication Number | Publication Date |
---|---|
US3378189A true US3378189A (en) | 1968-04-16 |
Family
ID=26263654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US577492A Expired - Lifetime US3378189A (en) | 1965-09-06 | 1966-09-06 | Plastic sack |
Country Status (7)
Country | Link |
---|---|
US (1) | US3378189A (en) |
BE (1) | BE686514A (en) |
ES (1) | ES130978Y (en) |
GB (1) | GB1152463A (en) |
LU (1) | LU51879A1 (en) |
NL (1) | NL6612547A (en) |
SE (1) | SE322464B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4491959A (en) * | 1982-04-22 | 1985-01-01 | Wavin B.V. | Plastic bag with gusset folds and perforations |
US4573203A (en) * | 1982-06-14 | 1986-02-25 | Paramount Packaging Corp. | Reusable plastic bag with loop handle |
US4613988A (en) * | 1984-02-29 | 1986-09-23 | Mobil Oil Corporation | Thermoplastic bag and method of forming the same |
US4713839A (en) * | 1982-06-14 | 1987-12-15 | Paramount Packaging Corp. | Resealable reusable flexible plastic bag with loop handle |
US4890934A (en) * | 1987-10-30 | 1990-01-02 | The Procter & Gamble Company | Plastic carrier bag with cut-out carry handle |
US5112138A (en) * | 1982-06-14 | 1992-05-12 | Paramount Packaging Corporation | Resealable reusable flexible plastic bag with loop handle |
US5350239A (en) * | 1991-10-03 | 1994-09-27 | Norsk Hydro A.S. | Suspension and venting |
US6196717B1 (en) | 1998-03-27 | 2001-03-06 | Pactiv Corporation | Folded thermoplastic bag structure |
US20020147091A1 (en) * | 2000-05-24 | 2002-10-10 | Colgate-Palmolive Company | Reclosable bag |
US20040188310A1 (en) * | 2003-03-31 | 2004-09-30 | Peter Hamilton | Ventable storage bag |
US20050157961A1 (en) * | 2004-01-21 | 2005-07-21 | Dudley Langston | Vented package |
US20060257056A1 (en) * | 2003-07-24 | 2006-11-16 | Hidenobu Miyake | Packaging bag with steam releasing function and package body using the packaging bag |
EP2135818A1 (en) * | 2008-06-20 | 2009-12-23 | Nordfolien GmbH | Inflatable packaging |
US20110158562A1 (en) * | 2009-12-31 | 2011-06-30 | Emballage Rouville Inc. | Deflatable bag with laterally perforated liner and non-adjacent humidity barrier |
US20160107826A1 (en) * | 2014-10-21 | 2016-04-21 | The Procter & Gamble Company | Flexible package and methods of making same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3902494B2 (en) * | 2001-07-19 | 2007-04-04 | 博之 山田 | Bag body having deaeration structure and manufacturing method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE40107C (en) * | A. KEMPE in Olbernhau, Sachsen | Slidable air rifle barrel | ||
US2790591A (en) * | 1954-04-20 | 1957-04-30 | Milprint Inc | Commodity bag for automatic filling machines |
US3023947A (en) * | 1955-08-16 | 1962-03-06 | Int Paper Co | Multiwall bag |
US3133691A (en) * | 1962-10-30 | 1964-05-19 | Nat Distillers Chem Corp | Vent for thermoplastic bag |
US3237844A (en) * | 1963-10-07 | 1966-03-01 | Ici Ltd | Bag closure |
-
1965
- 1965-09-06 GB GB37978/65A patent/GB1152463A/en not_active Expired
-
1966
- 1966-09-02 LU LU51879A patent/LU51879A1/xx unknown
- 1966-09-05 SE SE11941/66A patent/SE322464B/xx unknown
- 1966-09-06 ES ES1966130978U patent/ES130978Y/en not_active Expired
- 1966-09-06 BE BE686514A patent/BE686514A/xx unknown
- 1966-09-06 US US577492A patent/US3378189A/en not_active Expired - Lifetime
- 1966-09-06 NL NL6612547A patent/NL6612547A/xx unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE40107C (en) * | A. KEMPE in Olbernhau, Sachsen | Slidable air rifle barrel | ||
US2790591A (en) * | 1954-04-20 | 1957-04-30 | Milprint Inc | Commodity bag for automatic filling machines |
US3023947A (en) * | 1955-08-16 | 1962-03-06 | Int Paper Co | Multiwall bag |
US3133691A (en) * | 1962-10-30 | 1964-05-19 | Nat Distillers Chem Corp | Vent for thermoplastic bag |
US3237844A (en) * | 1963-10-07 | 1966-03-01 | Ici Ltd | Bag closure |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4491959A (en) * | 1982-04-22 | 1985-01-01 | Wavin B.V. | Plastic bag with gusset folds and perforations |
US4573203A (en) * | 1982-06-14 | 1986-02-25 | Paramount Packaging Corp. | Reusable plastic bag with loop handle |
US4713839A (en) * | 1982-06-14 | 1987-12-15 | Paramount Packaging Corp. | Resealable reusable flexible plastic bag with loop handle |
US5112138A (en) * | 1982-06-14 | 1992-05-12 | Paramount Packaging Corporation | Resealable reusable flexible plastic bag with loop handle |
US4613988A (en) * | 1984-02-29 | 1986-09-23 | Mobil Oil Corporation | Thermoplastic bag and method of forming the same |
US4890934A (en) * | 1987-10-30 | 1990-01-02 | The Procter & Gamble Company | Plastic carrier bag with cut-out carry handle |
US5350239A (en) * | 1991-10-03 | 1994-09-27 | Norsk Hydro A.S. | Suspension and venting |
US6196717B1 (en) | 1998-03-27 | 2001-03-06 | Pactiv Corporation | Folded thermoplastic bag structure |
US20020147091A1 (en) * | 2000-05-24 | 2002-10-10 | Colgate-Palmolive Company | Reclosable bag |
US7237953B2 (en) * | 2000-05-24 | 2007-07-03 | Colgate-Palmolive Company | Reclosable bag |
US20040188310A1 (en) * | 2003-03-31 | 2004-09-30 | Peter Hamilton | Ventable storage bag |
US7004632B2 (en) | 2003-03-31 | 2006-02-28 | The Glad Products Company | Ventable storage bag |
US20060257056A1 (en) * | 2003-07-24 | 2006-11-16 | Hidenobu Miyake | Packaging bag with steam releasing function and package body using the packaging bag |
US8777486B2 (en) * | 2003-07-24 | 2014-07-15 | Toppan Printing Co., Ltd. | Packaging bag with steam venting function and package using the packaging bag |
US20050157961A1 (en) * | 2004-01-21 | 2005-07-21 | Dudley Langston | Vented package |
EP2135818A1 (en) * | 2008-06-20 | 2009-12-23 | Nordfolien GmbH | Inflatable packaging |
US20110158562A1 (en) * | 2009-12-31 | 2011-06-30 | Emballage Rouville Inc. | Deflatable bag with laterally perforated liner and non-adjacent humidity barrier |
US20160107826A1 (en) * | 2014-10-21 | 2016-04-21 | The Procter & Gamble Company | Flexible package and methods of making same |
Also Published As
Publication number | Publication date |
---|---|
NL6612547A (en) | 1967-03-07 |
GB1152463A (en) | 1969-05-21 |
ES130978Y (en) | 1968-05-16 |
BE686514A (en) | 1967-03-06 |
ES130978U (en) | 1968-01-16 |
LU51879A1 (en) | 1966-11-03 |
SE322464B (en) | 1970-04-06 |
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