US3473445A - Installation for manufacturing block bags - Google Patents

Installation for manufacturing block bags Download PDF

Info

Publication number
US3473445A
US3473445A US728547A US3473445DA US3473445A US 3473445 A US3473445 A US 3473445A US 728547 A US728547 A US 728547A US 3473445D A US3473445D A US 3473445DA US 3473445 A US3473445 A US 3473445A
Authority
US
United States
Prior art keywords
foil
bags
tubular
carrier
valve
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
US728547A
Other languages
English (en)
Inventor
Leonard Van Der Meulen
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.)
Meulen Leonard V D
Original Assignee
Meulen Leonard V D
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 Meulen Leonard V D filed Critical Meulen Leonard V D
Application granted granted Critical
Publication of US3473445A publication Critical patent/US3473445A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • 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
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D5/00—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles
    • B31D5/0034—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles for making valve inserts for 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
    • 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
    • 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
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/003—Flexible containers made from sheets or blanks, e.g. from flattened tubes made from tubular sheets
    • 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
    • B31B2170/00—Construction of flexible containers
    • 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
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/022—Holders for feeding or positioning sheets or webs
    • B31B70/024—Rotating holders, e.g. star wheels, drums
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/844—Applying rigid valves, spouts, or filling tubes

Definitions

  • My invention relates to an installation for manufacturing block bags and/or block bags provided with at least one valve.
  • Such devices are known for manufacturing paper bags.
  • the device requires a flat foil web which about a folder is shaped into a tubular foil which thereupon is moved past a number of folding means whereby the bottom quadrat is formed and the bottom label, if any, is applied for obtaining a plastic block bottom bag provided with a valve.
  • an installation for manufacturing block bags and/ or block bags provided with at least one valve comprises at least feeding means, movable carrier means for conveying foil material to stations where it receives treatment, clamping means capable of cooperation with the carrier means, cutting means for incising the foil material, folding means forming a bottom quadrat, folding means for folding the lateral marginal parts of the bottom quadrat, means for severing the tubular foil, glueing and/or sealing means, and, if desired, bottom label applying means, a tube opening member retained with clearance between foil guiding members for internally opening the tubular :foil and a foil incising member acting at the location of the member, auxiliary carrying members which auxiliary members can be disposed beside carrier members.
  • the clamping means are opice erative on the side areas of the carrier means and auxiliary members over at least a part of the trajectory of cooperation between the clamping means and the carrier means.
  • the devices comprises also means incising the tubular foil from the sides in a transverse direction.
  • the carrier members on a first circuit are conveniently composed of at least two carrier member parts and an intermediate carrier member part. This supporting carrier member can serve to apply the valve label.
  • auxiliary carrying members which are composed of at least two separated auxiliary member parts and a third auxiliary member part, the means for severing the tubular foil being active at the location of the location of the third auxiliary member part.
  • the device is conveniently provided with suction members which are operative in the area between successive carrier means.
  • bags can be manufactured at a fast rate, to wit at a rate of 50 bags per minute which can be increased up to bags.
  • My invention will be clarified with reference to an embodiment of a device for the manufacture of glued block bags provided with a valve. It is obvious, however, that the invention is not limited to the manufacture of glued bags but covers also the application of definite heatsealed joints in the process.
  • FIGURE 1 shows diagrammatically a device for manufacturing glued block bags comprising a valve
  • FIGURE 2 represents the various stages of treatment of a block bag to be manufactured from a tubular foil part
  • An installation for manufacturing glued block bags from plastic foil material comprises foil feeding means consisting of a feed roller 1 on which is disposed the thermoplastic tubular foil material 2 which by means of feed rollers 3 and guide rollers 4 is guided through two roller pairs 5 and 6 situated one above the other. Between the roller pairs 5 and 6 is a tube opening member in the shape of a frame or block 7 on which the plastic foil tube is guided so that the walls of the plastic tube 2 no longer contact one another.
  • a knife 8 which may be heated by which a. cross cut 9 can be made in the wall of the tubular plastic foil, whereby when the material is being incised, two edges are formed simultaneously which in FIGURE 2 are denoted by 28 and 29. This cross cut 9 is only made on a part of the width of the folded plastic tubular foil.
  • Guide rollers 10 and 11 are provided for the further transport of the material.
  • the device further comprises a number of movably mounted carrier means 12 which are secured on two movable chains 13, guided on rollers 14 and driven by a motor (not shown) by means of a driving roller 15. These means constitute a first circuit.
  • auxiliary carrying members 18 are mounted on two likewise movable chains 16 which can be driven via a driving roller 17 by a motor (not shown) these auxiliary carrying members 18 constitute together with the carrier means 12 supporting faces for performing treatment on the tubualr plastic foil 2.
  • a quantity of plastic foil material 2 is introduced in the shape of a curve 2a between two consecutive carriers 12, which egg. is effected by suction.
  • the device comprises furthermore means for incising the tubular foil from the sides in a transverse direction, in the shape of a cutter 19 which can cut through the material, disposed on a supporting face in the shape of a tubular plastic foil 2, on either side of the incision 9.
  • a cutter 19 which can cut through the material, disposed on a supporting face in the shape of a tubular plastic foil 2, on either side of the incision 9.
  • the incision 20 indicated in FIGURE 2 is formed.
  • movable clamping means in the form of belts 21 and 22 retaining the material during the subsequent treatments in the longitudinal marginal portions directly situated beside the lateral edges 23 and 24 of the plastic tube.
  • a bottom quadrat forming device in the shape of a tube unfolding member consisting of wedges 26 and 27 mounted on a belt by which means the edges 28 and 29, produced on the formation of the cross cut, are folded back while forming triangular small pockets 30 and 30a and the bottom quadrats 56 and 57.
  • the glue applying means consisting of a glue container 31 from which via a roller 32 glue is taken which via a roller 33 is applied to the bottom quadrat 57 in two glue strips 34, 35 on the pockets 30 and a glue strip 36 in the vicinity of and parallel to the connecting marginal portion 37 of the tubular foil existing between the bottom quadrats 56 and 57 after the bottom quadrat has been folded.
  • valve foil applying device consisting of a valve foil supply package 38 from which the valve foil material is passed via guide rollers 39 to a vacuum drum 40 divided into sectors. In this way block bags comprising a valve can be manufactured, but bags without a valve may also be produced.
  • a cutter 41 is provided for cutting the valve label to the desired size. After severance the valve label 42 is taken along in the previously determined shape to the supporting face where it is brought into contact with the forwardly fed bottom quadrat 56 moving at the same speed as the drum 40. When the drum comes into ocntact with one of the pockets 30a and the other foil material the vacuum is terminated and the valve label foil 42 is laid at a slight over-pressure on the bottom quadrat 56 of the tubular foil material whereby one of the glue strips 35 and a part of the glue strip 36 ensure the connection of label foil and bottom quadrat 56.
  • a second foil cutting knife 43 cutting through the still existing connecting marginal portion 37 between the bottom quadrats 56 and '57 so that a separate tubular bag part 61 is produced with ends formed by the flat bottom quadrats 56 and 57.
  • Depressing members 44 may be provided past the cutter 43 in order to press the bottom quadrats 56 and 57 situated on the supporting face into a cavity of the carrier members 12a and 12b, whereby the transverse marginal portions 46 and 46a, 46b, 46c, situated beside the folding lines 58. 58a, 58b, 580, are produced.
  • a folding mechanism 47 folding the marginal portions 46, 46a, 46b, and 460 and comprising a roller 50 operable by an eccentric 48 and secured to an arm 49, the roller 50 being movable in the direction of conveyance to act upon a marginal portion 46a, an inclined counter plate 51 folding the transverse marginal portion 46 over the marginal portion 46a and the marginal portions 46 and 46a being connected by glue.
  • a presser roller 52 is provided in order to reinforce this glued joint.
  • a bottom label applying device consisting of a foil supply package 53, a glue container 54 with a glue doctor roller 55.
  • a heated roller 57 cooperates with this glue doctor roller 55 and the material of the supply package 53 is passed from *between the two rollers.
  • the foil material of the supply package 53 on moving from between the rollers 55 and 57a is provided with a fast adhering glue.
  • the foil material arrives at a second vacuum drum 59 in front of which is a cutter 59a.
  • This cutter 59a serves the foil material to the length desired for the bottom label 60 after the material has been placed on the second vacuum drum 59, whereupon this label 60 via the drum 59 is disposed on the marginal portions 46 and 46:: which are already folded over one the other. Due to the glue the bottom label 60 will adhere well and constitute the final bottom.
  • a tubular bag part 61 is then obtained with a flat bottom 63, provided with a valve 62, formed from a bottom quadrat 56 and a normal flat bottom 66 formed from a bottom quadrat 57. It is obvious that, if desired, when a valve strip 42 is omitted a bag can be formed with two closed flat bottoms whereby by severing the tubular bag part 61 two block bags open at one end can be obtained.
  • the carrier parts on the first circuit 13 move off, whereupon the auxiliary carrying members on the second circuit 16 are removed.
  • the carrier members 12 are on the first circuit on endless chains 13 while the auxiliary carrying members 18 are on the second circuit on endless chains 16.
  • the carrier members consist preferably of carrier member parts 12a. 12b and an intermediate carrier member part in order to prevent difiiculties during movement around guiding elements.
  • the auxiliary carrying members provided on the second circuit 16 consist likewise of three parts, viz the auxiliary carrying member parts 18a, 18b and a third carrying member part 18c.
  • the foil severing means 43 are situated in such a way that they are operative in the area of the third auxiliary carrying member part 18c.
  • the third carrier member part 12c is provided in such a way that it may serve to dispose the valve label foil. Obviously operations can also be carried out in inversed order.
  • the bags are discharged via a mechanism which is not further discussed.
  • the bags may be provided with welded joints instead of glued joints at definite locations.
  • My invention relates also to plastic bags obtained by means of the installation.
  • Apparatus for manufacturing block bags having two block bottoms at least one of which can be provided with a valve comprising feeding means for advancing tubular foil in flattened condition, means for expanding the foil into opened form, first foil incising means for producing a cut in the expanded foil extending transversely with respect to the direction of movement of the foil, first spaced movable carrier means for conveying the thus cut tubular foil, movable auxiliary carrier means placed between two successive first movable carrier means after delivery of the tubular foil between two successive first movable carrier means, said auxiliary carrier means being removed from between the first carrier means after formation of the bags, first foil cutting means for forming transverse slits in the tubular foil at both sides thereof in the plane of the cuts made by said first foil incising means to leave a connecting fiat part in the foil material, first and second clamping means cooperating with the first carrier means and the auxiliary means lying between same, first folding means for forming bottom quadrats at both sides of the cuts and slits respectively formed by the first foil
  • said first folding means comprises an endless belt and wedges on said belt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
US728547A 1967-05-12 1968-05-13 Installation for manufacturing block bags Expired - Lifetime US3473445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6706720 1967-05-12

Publications (1)

Publication Number Publication Date
US3473445A true US3473445A (en) 1969-10-21

Family

ID=19800116

Family Applications (1)

Application Number Title Priority Date Filing Date
US728547A Expired - Lifetime US3473445A (en) 1967-05-12 1968-05-13 Installation for manufacturing block bags

Country Status (5)

Country Link
US (1) US3473445A (forum.php)
BE (1) BE715090A (forum.php)
CH (1) CH490965A (forum.php)
DE (1) DE1778571A1 (forum.php)
FR (1) FR1561881A (forum.php)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114286791A (zh) * 2019-08-24 2022-04-05 洛希亚有限公司 用于袋成形的方法和设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3306053C2 (de) * 1982-09-07 1994-11-24 Altstaedter Verpack Vertrieb Verfahren zum Herstellen eines Schlauchstückes aus einer flachen Bahn und Vorrichtung zur Durchführung eines solchen Verfahrens

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926421A (en) * 1929-08-12 1933-09-12 Andreas Arno Method and apparatus for manufacturing paper bags
US2125307A (en) * 1934-07-13 1938-08-02 Smithe Machine Co Inc F L Bag making machine
US2333440A (en) * 1940-01-17 1943-11-02 Potdevin Machine Co Bagmaking machine
US2845214A (en) * 1953-07-16 1958-07-29 Windmoller & Holscher Fa Bag
US2847914A (en) * 1956-03-09 1958-08-19 Equitable Paper Bag Co Bag bottoming machine
US3043199A (en) * 1959-10-16 1962-07-10 Windmoeller & Hoelscher Manufacture of cross-bottomed valve bags
US3172342A (en) * 1963-01-31 1965-03-09 Potdevin Machine Co Bag-making machines
US3195424A (en) * 1961-05-23 1965-07-20 Natro Cellulosa S P A Plastic bag
US3196762A (en) * 1964-10-08 1965-07-27 Aluminum Co Of America Method of making containers
US3242829A (en) * 1963-11-07 1966-03-29 American Can Co Container
US3266387A (en) * 1962-10-16 1966-08-16 Windmoeller & Hoelscher Method and machine for making bags
US3279330A (en) * 1964-06-19 1966-10-18 St Regis Paper Co Method for making all plastic valved bags
US3345919A (en) * 1965-02-18 1967-10-10 Union Carbide Corp Continuous bag making machine
US3366018A (en) * 1965-03-19 1968-01-30 Continental Can Co Apparatus for and method of manufacturing multi-ply bags
US3395064A (en) * 1964-10-12 1968-07-30 Schmermund Alfred Devices for attaching tear strips to wrapping material
US3397622A (en) * 1965-05-05 1968-08-20 Bemis Co Inc Bags

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1926421A (en) * 1929-08-12 1933-09-12 Andreas Arno Method and apparatus for manufacturing paper bags
US2125307A (en) * 1934-07-13 1938-08-02 Smithe Machine Co Inc F L Bag making machine
US2333440A (en) * 1940-01-17 1943-11-02 Potdevin Machine Co Bagmaking machine
US2845214A (en) * 1953-07-16 1958-07-29 Windmoller & Holscher Fa Bag
US2847914A (en) * 1956-03-09 1958-08-19 Equitable Paper Bag Co Bag bottoming machine
US3043199A (en) * 1959-10-16 1962-07-10 Windmoeller & Hoelscher Manufacture of cross-bottomed valve bags
US3195424A (en) * 1961-05-23 1965-07-20 Natro Cellulosa S P A Plastic bag
US3266387A (en) * 1962-10-16 1966-08-16 Windmoeller & Hoelscher Method and machine for making bags
US3172342A (en) * 1963-01-31 1965-03-09 Potdevin Machine Co Bag-making machines
US3242829A (en) * 1963-11-07 1966-03-29 American Can Co Container
US3279330A (en) * 1964-06-19 1966-10-18 St Regis Paper Co Method for making all plastic valved bags
US3196762A (en) * 1964-10-08 1965-07-27 Aluminum Co Of America Method of making containers
US3395064A (en) * 1964-10-12 1968-07-30 Schmermund Alfred Devices for attaching tear strips to wrapping material
US3345919A (en) * 1965-02-18 1967-10-10 Union Carbide Corp Continuous bag making machine
US3366018A (en) * 1965-03-19 1968-01-30 Continental Can Co Apparatus for and method of manufacturing multi-ply bags
US3397622A (en) * 1965-05-05 1968-08-20 Bemis Co Inc Bags

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114286791A (zh) * 2019-08-24 2022-04-05 洛希亚有限公司 用于袋成形的方法和设备
CN114286791B (zh) * 2019-08-24 2023-12-01 洛希亚有限公司 用于袋成形的方法和设备

Also Published As

Publication number Publication date
DE1778571A1 (de) 1971-08-05
CH490965A (de) 1970-05-31
BE715090A (forum.php) 1968-09-30
FR1561881A (forum.php) 1969-03-28

Similar Documents

Publication Publication Date Title
US2785609A (en) Art of producing lip-type bags
US3361041A (en) Method and apparatus for making gusseted header bags
US2290564A (en) Making of bags and envelopes
US3857329A (en) Fabrication of a carrying bag from thermoplastic synthetic film
US3041941A (en) Manufacture of containers or the like
US3148598A (en) Making bags with enclosed stiffener at top
US3611883A (en) Apparatus and method for making baglike containers with boxlike top
US3406611A (en) Apparatus for producing and stacking sheetlike items
US3576154A (en) Process and apparatus for manufacturing bags comprising a liner bag which protrudes from the opening
US3228583A (en) Bag for bulky merchandise
US2281964A (en) Method and apparatus for making paper bags
US4388794A (en) Apparatus for cutting and transporting blanks from a web of flexible material
US3473445A (en) Installation for manufacturing block bags
US2649035A (en) Apparatus for making stiffended wrappers
US3485697A (en) Method and apparatus for forming a plastic bag with an integral pouch
US2106431A (en) Manufacture of paper or like bag tubes or bags
US2102001A (en) Manufacture of dry-sealing envelopes
US2895387A (en) Multiply bag with supplemental sleeve
US3143936A (en) Manufacture of bags
CA2272692C (en) Method and apparatus for obtaining individual web sections from a web of sheet material
US2061438A (en) Process of making bags
US1941272A (en) Method of and apparatus for making bags
US2192177A (en) Machine for making satchel-bottom bags
US2212469A (en) Manufacture of paper and like bags, envelopes, and the like
GB1295618A (forum.php)