US3896714A - Process of manufacturing block bottom bags - Google Patents
Process of manufacturing block bottom bags Download PDFInfo
- Publication number
- US3896714A US3896714A US415513A US41551373A US3896714A US 3896714 A US3896714 A US 3896714A US 415513 A US415513 A US 415513A US 41551373 A US41551373 A US 41551373A US 3896714 A US3896714 A US 3896714A
- Authority
- US
- United States
- Prior art keywords
- bag
- face
- flat
- block bottom
- seam
- 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
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/26—Folding sheets, blanks or webs
- B31B70/261—Folding sheets, blanks or webs involving transversely folding, i.e. along a line perpendicular to the direction of movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
- B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
- B31B2150/0012—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom having their openings facing in the direction of movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/25—Surface scoring
Definitions
- the side gussets are subsequently spread to transform the bottom portion of the bag into a block bottom in such a manner that the underside of the bag and the lower folded edge are retained in a portion which extends from the bottom seam by a distance equal to the gusset depth.
- the upper folded edge and/or the upper side of the bag is gripped by movable gripping means, and the gripping means are moved relative to the support so as to form the block bottom.
- the gripping means which grip the upper folded edge and/or the upper side of the bag are moved tangentially to the support for the bag during the transformation of the bottom portion whereas a lifting component of motion is avoided.
- This invention relatesto a process of manufacturing a block bottom bag, in which a bag having side gussets and a simple bottom seam (side-gusseted flat bag) is made first, the side gussets are subsequently spread to transform the bottom portion of, the bag intoya block bottom in such amanner that the underside of the bag and the lower folded edge are retained. in a portion which extends from the bottom seam by a distance equal to the gusset depth, the upper foldededge and/or the upper side of the bagis gripped by movable gripping means, and the gripping means are moved relative to the support so as to form the block bottom.
- This procedure has the advantage that a block bottom bag can bemade with relatively simple apparatus.
- the semicircular relative movement has also the advantage that the bag material is substantially stretched during the formation of the bottom and a wrinkling of the bag material is avoided.so that neat bottom folds are obtained.
- this. procedure has the disadvantage that the pulling openof. the side-gusseted bag adjacent to the bottom like opening bellows during the formation of the block bottom gives-rise to the formation of a large cavity, which must fill with air. To enter the cavity, this air must flow through the filling opening and throughout the length of the flat sidegusseted bag. Because the side-gusseted bag is flat, it presents a high resistance to the flow of the air.
- Block bottom bags are known to have the convenient property of opening readily into the subsequent parallel-epipedic shape as they are filled manually or by machine.
- this object is accomplished inthatthe gripping means which grip the upper folded edge and/or the upper side of the bag are moved tangentially to the support for the bag during the transformation of thebottom portion whereas a lifting component of motion is avoided.
- the block bottom is formed substantially within the plane, of the bag in that the superimposed wall portions of the bag are peeled from each other and any vacuum formed adja- -cent to the bottom is utilized.
- FIGS. 1 to 5 shows the left-hand half of the bottom portion of the bag made by the process according to the invention.
- FIG. 1 It is shownin FIG. 1. that in the manufacture of bags in accordance with the invention, individual tube sections lare initially provided, which have side gussets 2 having adepth T. These tube sections are severed by cuts along the edge 3 from a virtually endless flat tubing of plastics material'in which the side gussets have been formed in known manner. The tube section is formed at the bottom cut edge with a transverse seam weld 4, as shown in FIG. .2, to form a normal side-gusseted flat bag. Toprepare the formation of a block bottom, transverse sco're lines '5 and 6 are formed throughout the width of the bag before, during or after the welding.
- score lines are spaced from that edge of the seam weld 4 which faces the interior of the bag by distances T'and 2T, which are equal to the side gusset depth T and twice the side gusset depth T, respectively.
- These score lines facilitate the formation of a block bottom with uniform precision in all bags which are made and also serve to preserve the resulting bottom during the storage and shipment of the finished flat bags until they are used.
- tools must engage the bag adjacent to its bottom. The bag is first engaged on both sides by respective holding-down members 7, which are as flat as possible and engage the bag in such a manner that that edge of the holding-down member which faces the bottom end of the bag is approximately flush with the inner score line 6.
- the side gusset must be opened to form a small gap adjacent to the lower score line 5 so that holding-down members 8 can be laterally introduced between respective side gussets of the bag.
- the side gussets may be opened by a row of suckers 11, which are indicated by the suction points 9 and the arrows 10 and act on the top face of the bag inside the lower score line 5 between the latter and the seam weld 4, or by individual suckers, which are effective only adjacent to the side gussets. Another row of suckers may act on the underside of the bag shortly behind the score line 5.
- the holding-down member 8 When the side gusset has been slightly spread, the holding-down member 8 may be introduced.
- the holding-down member 8 is as flat as possible and is bevelled at an angle of 45 at its forward edge facing the bottom seam weld 4.
- the holding-down member is introduced in such a manner that its bevelled forward edge crosses the side edge of the bag at the score line 5 so that the holding-down member engages the bag behind the score line 5.
- the underside may also be retained on the support by a row of suckers, which is aligned with the holding-down members 8.
- the sidegusseted flat bag shown in FIG. 3 may be transformed into a block bottom bag.
- This movement is indicated by the arrows 12.
- a lifting at right angles to the plane of the bag is avoided.
- This movement results in the transformation of the side-gusseted flat bag into a block bottom bag in that the wall portions slip relative to each other although their movement is not exactly regular at the beginning of the transformation.
- FIG. 4 illustrates the beginning of the transformation.
- FIG. shows a portion of the bag as the transforming movement is being completed and the bag toward the end of the transforming movement so that the block bottom bag has virtually been completed.
- the vacuum which forms in the interior of the bottom portion of the bag as its wall portions are peeled off is utilized to change the initially irregular transforming movement of the wall portions into an in- 4 creasingly regular movement/Toward the end of the movement, the wall portions are stretched to their desired position by the tools engaging the bottom portion of the bag so that an exact shaping of the bottom is ensured.
- thermoplastic material including the steps of:
Landscapes
- Making Paper Articles (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2256913A DE2256913A1 (de) | 1972-11-20 | 1972-11-20 | Verfahren zum herstellen eines klotzbodenbeutels |
Publications (1)
Publication Number | Publication Date |
---|---|
US3896714A true US3896714A (en) | 1975-07-29 |
Family
ID=5862267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US415513A Expired - Lifetime US3896714A (en) | 1972-11-20 | 1973-11-14 | Process of manufacturing block bottom bags |
Country Status (5)
Country | Link |
---|---|
US (1) | US3896714A (ja) |
JP (1) | JPS4982477A (ja) |
DE (1) | DE2256913A1 (ja) |
FR (1) | FR2207456A5 (ja) |
IT (1) | IT1001713B (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5102384A (en) * | 1989-09-01 | 1992-04-07 | Ross Philip E | Method for making flat bottom plastic bag |
US5135464A (en) * | 1990-05-02 | 1992-08-04 | Jebco Packaging Systems, Inc. | Method for manufacturing a container |
US6328683B1 (en) * | 1998-12-23 | 2001-12-11 | Windmöller & Hölscher | Device for pulling up the ends of continuously transverse-conveyed flat tubular segments during the production of sacks or bags |
US20090297073A1 (en) * | 2005-06-02 | 2009-12-03 | Smq Group B.V. | Method of manufacturing a foldable bag and a foldable bag |
US20100323868A1 (en) * | 2009-06-18 | 2010-12-23 | Ishida Co., Ltd. | Bag-making and packaging apparatus |
US20150111712A1 (en) * | 2012-04-30 | 2015-04-23 | Roberto Emilio Gingardi | Machine for making a bag bottom |
US10377549B2 (en) | 2009-04-29 | 2019-08-13 | Scholle Ipn Corporation | Foldable bag and a method of manufacturing a foldable bag |
US20220055333A1 (en) * | 2018-12-12 | 2022-02-24 | Holweg Group | Method and machine for forming flexible bags with special bottom |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5974065A (ja) * | 1982-10-15 | 1984-04-26 | 出光石油化学株式会社 | 角底袋および角底袋の製造方法 |
DE4317071A1 (de) * | 1993-05-21 | 1994-11-24 | Winkler Duennebier Kg Masch | Vorrichtung zum kontinuierlichen Herstellen von Umschlägen, Beuteln, Versandtaschen u. dgl. |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2648263A (en) * | 1948-10-02 | 1953-08-11 | Arthur W Richens | Method of making bags |
US3094905A (en) * | 1960-07-08 | 1963-06-25 | Robert L Haslacher | Process for making bags |
US3606822A (en) * | 1970-01-12 | 1971-09-21 | Nat Distillers Chem Corp | Method and apparatus for producing a flat-bottom plastic bag |
-
1972
- 1972-11-20 DE DE2256913A patent/DE2256913A1/de active Pending
-
1973
- 1973-11-12 IT IT31195/73A patent/IT1001713B/it active
- 1973-11-14 US US415513A patent/US3896714A/en not_active Expired - Lifetime
- 1973-11-19 FR FR7341041A patent/FR2207456A5/fr not_active Expired
- 1973-11-20 JP JP48130655A patent/JPS4982477A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2648263A (en) * | 1948-10-02 | 1953-08-11 | Arthur W Richens | Method of making bags |
US3094905A (en) * | 1960-07-08 | 1963-06-25 | Robert L Haslacher | Process for making bags |
US3606822A (en) * | 1970-01-12 | 1971-09-21 | Nat Distillers Chem Corp | Method and apparatus for producing a flat-bottom plastic bag |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5102384A (en) * | 1989-09-01 | 1992-04-07 | Ross Philip E | Method for making flat bottom plastic bag |
US5135464A (en) * | 1990-05-02 | 1992-08-04 | Jebco Packaging Systems, Inc. | Method for manufacturing a container |
US6328683B1 (en) * | 1998-12-23 | 2001-12-11 | Windmöller & Hölscher | Device for pulling up the ends of continuously transverse-conveyed flat tubular segments during the production of sacks or bags |
US20090297073A1 (en) * | 2005-06-02 | 2009-12-03 | Smq Group B.V. | Method of manufacturing a foldable bag and a foldable bag |
US9278496B2 (en) | 2005-06-02 | 2016-03-08 | Scholle Corporation | Method of manufacturing a foldable bag and a foldable bag |
US10377549B2 (en) | 2009-04-29 | 2019-08-13 | Scholle Ipn Corporation | Foldable bag and a method of manufacturing a foldable bag |
US20100323868A1 (en) * | 2009-06-18 | 2010-12-23 | Ishida Co., Ltd. | Bag-making and packaging apparatus |
US20150111712A1 (en) * | 2012-04-30 | 2015-04-23 | Roberto Emilio Gingardi | Machine for making a bag bottom |
US20220055333A1 (en) * | 2018-12-12 | 2022-02-24 | Holweg Group | Method and machine for forming flexible bags with special bottom |
US11833775B2 (en) * | 2018-12-12 | 2023-12-05 | Holweg Group | Method and machine for forming flexible bags with special bottom |
Also Published As
Publication number | Publication date |
---|---|
FR2207456A5 (ja) | 1974-06-14 |
DE2256913A1 (de) | 1974-05-22 |
JPS4982477A (ja) | 1974-08-08 |
IT1001713B (it) | 1976-04-30 |
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