EP0377416A1 - Plant for the continuous manufacture of bags using polypropylene, polythene, PVC and similar plastics - Google Patents
Plant for the continuous manufacture of bags using polypropylene, polythene, PVC and similar plastics Download PDFInfo
- Publication number
- EP0377416A1 EP0377416A1 EP89830531A EP89830531A EP0377416A1 EP 0377416 A1 EP0377416 A1 EP 0377416A1 EP 89830531 A EP89830531 A EP 89830531A EP 89830531 A EP89830531 A EP 89830531A EP 0377416 A1 EP0377416 A1 EP 0377416A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- film
- plant
- rolls
- bags
- 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.)
- Granted
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
- B31B2155/00—Flexible containers made from webs
-
- 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
- B31B2155/00—Flexible containers made from webs
- B31B2155/001—Flexible containers made from webs by folding webs longitudinally
-
- 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
- B31B2155/00—Flexible containers made from webs
- B31B2155/001—Flexible containers made from webs by folding webs longitudinally
- B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally 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
- 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
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
- B31B2160/106—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents obtained from sheets cut from larger sheets or webs before finishing the bag forming operations
Definitions
- the present invention relates to plant for the continuous cycle manufacture of bags fashioned in polypropylene, polythene, PVC and similar plastic materials.
- the prior art embraces a variety of systems for the formation of plastic bags by heat-sealing, all of which are intermittent in operation insofar as they involve indexing previously cut and folded sheets of plastic film, generally on a conveyor belt, into a heat-seal station that consists in a vertically reciprocating plate disposed transversely to the path of the conveyor, the film material being held motionless at the station until such time as two, three or four sides have been fused together to form the bag.
- a further drawback experienced with indexing type systems is that waste is generated, as a transverse strip of the film has to be trimmed away in order to provide an opening for the bag and ensure a tidy finish.
- the object of the present invention is to provide plant for the continuous cycle manufacture of bags using one or more reels of film, or alternatively, and by virtue of this same capacity for continuous production, operating in combination with a chill- (or cast-) roll facility of the type which produces film by continuous extrusion.
- a further object of the invention is to step up the number of bags turned out per hour by the plant, without jeopardizing quality.
- Another object of the invention is to reduce the quantity of waste generated in manufacture.
- the stated objects are comprehensively realized in plant according to the present invention, which is intended for the continuous production of bags in polypropylene, polythene, PVC and similar plastic film, and characterized in that it comprises: -a drive unit by means of which to uncoil film from one or more supply rolls; -continuously operating rotary heat-seal means with which to fuse one or more seams along longitudinal parallel edges of the film, and one or more seams in the transverse direction; -means by which to cool the heat-sealed film; -rotary means by which to cut and divide the film transversely and/or longitudinally into single bags, and if required, to punch one longitudinal edge of the bags.
- the folding device 5 serves to double up the film into two identical sandwiched layers, denoted 6, which are fed between two guide rollers 7 and then passed around a roller denoted 8, this in its turn flanked by a pressure roller 8a the purpose of which is to flatten the fold and align the running film in readiness for its passage through a set of units, or stations, to which the present invention effectively relates.
- the heat-seal station 11 comprises a top roll 12 and a bottom roll 13, both of which are driven by a belt 14 looped around two pulleys 15 and 16 keyed to the respective shafts 17 and 18 of the rolls 12 and 13.
- the belt 14 is kept taut by a tensioner 19, and turned by a pulley 20 set in rotation by a bevel gear pair 21 in receipt of drive from a shaft 22 coupled to a geared motor 23 (see fig 2).
- the roll shafts 17 and 18 are embodied hollow in order to accommodate wires 24 supplying electrical power to resistances 25 by which the rolls 12 and 13 are heated.
- the resistances 25 are arranged in two parallel and laterally positioned circumferential elements 26 and 27 by means of which to produce a pair of continuous longitudinal seams along the folded outer edges of the running film, and one transverse element 28 by means of which to produce a seam across the film.
- the shafts 17 and 18 are supported by bearings 29 and 29a carried in journal blocks 30 and 31 made fast to two respective rails 32 and 33 which are mounted slidably to columns 34.
- Each column 34 is part-threaded in such a way as to accept two lock nuts 37 which impinge on relative sleeves denoted 38; in effect, it is these sleeves that are mounted slidably to the columns and permit of adjusting the position of the roll shafts.
- the belt 35 denotes a belt looped around the bottom heated roll 13, the purpose of which is to isolate the folded film entirely from the surface of the roll, thereby preventing direct contact between the two; the belt 35 is set in motion by the roll 13 itself, and tensioned by means denoted 36.
- Plant according to the present invention comprises a cut and punch station located following the heat seal station.
- the station in question comprises two distinct devices: a transverse cutter 40a by which the continuous film is separated into single bags, and a punch 40b designed to produce a plurality of holes along one longitudinal edge of each bag.
- the cutter device 40a comprises a top roll 41a and a bottom roll 41b, of which the top roll 41a is urged elastically into contact with the bottom roll by spring means embodied in rubber 42.
- the blade and the striker are clamped and adjusted for position by way of means denoted 43a and 44a, respectively.
- the shafts 45 and 46 of the cutter device 40a are embodied hollow in order to permit of ducting a coolant to and from the rolls by way of relative manifolds 47, and are driven utilizing a system identical to that previously described for the heat seal rolls.
- the punch device 40b similarly comprises two rolls, of which the top roll 51 affords a plurality of holes 52, arranged in a circular formation and accommodating relative balls 53 each of which is held in place by a retaining ring 54 and urged against the ring by a setscrew 55.
- the bottom roll 56 of the device is fitted with a plurality of hollow cylindrical cutting edges 57 positioned in such a way as to register with the balls 53 of the top roll, and thus puncture each bag with circular holes.
- the bottom roll is carried by a shaft 60 that will be embodied hollow to permit of connection to an extractor system 61 for removal of the punchings which accumulate during the course of production.
- the two punch rolls 51 and 56 are urged together elastically by rubber spring means 62.
- the runout from the final station coincides with a conveyor belt 63 by which the finished bags are gathered up and counted.
Landscapes
- Making Paper Articles (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Pretreatment Of Seeds And Plants (AREA)
- Bag Frames (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
Abstract
Description
- The present invention relates to plant for the continuous cycle manufacture of bags fashioned in polypropylene, polythene, PVC and similar plastic materials.
- The prior art embraces a variety of systems for the formation of plastic bags by heat-sealing, all of which are intermittent in operation insofar as they involve indexing previously cut and folded sheets of plastic film, generally on a conveyor belt, into a heat-seal station that consists in a vertically reciprocating plate disposed transversely to the path of the conveyor, the film material being held motionless at the station until such time as two, three or four sides have been fused together to form the bag.
- Thus, given of necessity that the sheet must remain static at the heat-seal station, plastic bags of the type in question are costly to manufacture, and there is no way in which this aspect of production can be speeded up.
- A further drawback experienced with indexing type systems is that waste is generated, as a transverse strip of the film has to be trimmed away in order to provide an opening for the bag and ensure a tidy finish.
- The object of the present invention is to provide plant for the continuous cycle manufacture of bags using one or more reels of film, or alternatively, and by virtue of this same capacity for continuous production, operating in combination with a chill- (or cast-) roll facility of the type which produces film by continuous extrusion.
- A further object of the invention is to step up the number of bags turned out per hour by the plant, without jeopardizing quality.
- Another object of the invention is to reduce the quantity of waste generated in manufacture.
- Utilizing plant according to the present invention, moreover, it becomes possible to turn out bags, in continuous cycle, with stiffening ribs, and with holes if appropriate, either by adding a further layer of film or by direct extrusion.
- The stated objects are comprehensively realized in plant according to the present invention, which is intended for the continuous production of bags in polypropylene, polythene, PVC and similar plastic film, and characterized in that it comprises:
-a drive unit by means of which to uncoil film from one or more supply rolls;
-continuously operating rotary heat-seal means with which to fuse one or more seams along longitudinal parallel edges of the film, and one or more seams in the transverse direction;
-means by which to cool the heat-sealed film;
-rotary means by which to cut and divide the film transversely and/or longitudinally into single bags, and if required, to punch one longitudinal edge of the bags. - The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
- -fig 1 is a schematic representation of the plant disclosed, viewed in plan;
- -fig 2 is a further schematic of the plant, viewed in side elevation;
- -fig 3 illustrates a heat-seal station, in side elevation;
- -fig 4 shows the sectional view of the heat-seal station taken through III-III in fig 3;
- -fig 5 is a side elevation of the cut and punch station;
- -fig 6 is the sectional view of the punch station, taken through IV-IV in fig 5;
- -fig 7 is the sectional view of the cutter station taken through V-V in fig 5.
- With reference to figs 1 and 2, it will be observed that the plant described is of the type utilizing a continuous film of plastic material (polypropylene) folded into two thicknesses.
- 1 denotes the supply roll, supported by a holder 2, from which the
film 3 is uncoiled, passed between twoguide rollers 4 and fed to afolding device 5 of conventional embodiment, shown schematically in the drawings. - The
folding device 5 serves to double up the film into two identical sandwiched layers, denoted 6, which are fed between two guide rollers 7 and then passed around a roller denoted 8, this in its turn flanked by a pressure roller 8a the purpose of which is to flatten the fold and align the running film in readiness for its passage through a set of units, or stations, to which the present invention effectively relates. - 9 denotes a drive unit consisting in two power driven
pinch rolls 10 by which the film is drawn from the supply roll and fed into the successive stations. - 11 denotes a heat seal station, in its entirety, located following and in alignment with the drive unit.
- With reference now to figs 3 and 4, the heat-
seal station 11 comprises atop roll 12 and abottom roll 13, both of which are driven by abelt 14 looped around twopulleys respective shafts rolls belt 14 is kept taut by atensioner 19, and turned by apulley 20 set in rotation by abevel gear pair 21 in receipt of drive from ashaft 22 coupled to a geared motor 23 (see fig 2). - The
roll shafts wires 24 supplying electrical power toresistances 25 by which therolls - In the example illustrated, the
resistances 25 are arranged in two parallel and laterally positionedcircumferential elements transverse element 28 by means of which to produce a seam across the film. - The
shafts bearings journal blocks respective rails columns 34. - Each
column 34 is part-threaded in such a way as to accept twolock nuts 37 which impinge on relative sleeves denoted 38; in effect, it is these sleeves that are mounted slidably to the columns and permit of adjusting the position of the roll shafts. - 39 denotes one of four pneumatic cylinders located between the two
rails - 35 denotes a belt looped around the bottom heated
roll 13, the purpose of which is to isolate the folded film entirely from the surface of the roll, thereby preventing direct contact between the two; thebelt 35 is set in motion by theroll 13 itself, and tensioned by means denoted 36. - Plant according to the present invention comprises a cut and punch station located following the heat seal station.
- As discernible from figs 5, 6 and 7, the station in question, denoted 40 in its entirety, comprises two distinct devices: a transverse cutter 40a by which the continuous film is separated into single bags, and a
punch 40b designed to produce a plurality of holes along one longitudinal edge of each bag. - The cutter device 40a comprises a
top roll 41a and abottom roll 41b, of which thetop roll 41a is urged elastically into contact with the bottom roll by spring means embodied inrubber 42. - 43 denotes a transversely disposed blade carried by the
bottom roll 41b, which operates in conjunction with astriker 44 set into thetop roll 41a. - The blade and the striker are clamped and adjusted for position by way of means denoted 43a and 44a, respectively.
- The
shafts relative manifolds 47, and are driven utilizing a system identical to that previously described for the heat seal rolls. - The
punch device 40b similarly comprises two rolls, of which thetop roll 51 affords a plurality ofholes 52, arranged in a circular formation and accommodatingrelative balls 53 each of which is held in place by aretaining ring 54 and urged against the ring by asetscrew 55. - The
bottom roll 56 of the device is fitted with a plurality of hollowcylindrical cutting edges 57 positioned in such a way as to register with theballs 53 of the top roll, and thus puncture each bag with circular holes. - The bottom roll is carried by a
shaft 60 that will be embodied hollow to permit of connection to anextractor system 61 for removal of the punchings which accumulate during the course of production. Like the rolls of the cutter device, the twopunch rolls - The runout from the final station coincides with a
conveyor belt 63 by which the finished bags are gathered up and counted. - Alternative embodiments of the invention might well be contemplated, without prejudice to the scope of the appended claims; for example, the number and position of the resistances in the heat seal rolls could be varied to suit different types and sizes of bags.
Claims (7)
characterized
in that it comprises:
-a drive unit (9) by means of which to uncoil a continuous film from one or more supply rolls;
-continuously operating rotary heat-seal means (11) with which to produce one or more fused seams along longitudinal parallel edges of the film, and one or more seams in the transverse direction;
-means by which to cool the heat-sealed film;
-rotary means (40) by which to cut and divide the film transversely and/or longitudinally into single bags, and if required, to punch one longitudinal edge of the bags.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89830531T ATE91250T1 (en) | 1989-01-04 | 1989-12-01 | PLANT FOR CONTINUOUS MANUFACTURE OF POLYPROPYLENE, POLYETHENE, PVC OR SIMILAR PLASTIC MATERIAL BAGS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT400289 | 1989-01-04 | ||
IT400289 | 1989-01-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0377416A1 true EP0377416A1 (en) | 1990-07-11 |
EP0377416B1 EP0377416B1 (en) | 1993-07-07 |
Family
ID=11112005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89830531A Expired - Lifetime EP0377416B1 (en) | 1989-01-04 | 1989-12-01 | Plant for the continuous manufacture of bags using polypropylene, polythene, pvc and similar plastics |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0377416B1 (en) |
AT (1) | ATE91250T1 (en) |
DE (1) | DE68907475T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767306A1 (en) * | 1997-08-12 | 1999-02-19 | Morvan Sous Traitance | Manufacturing method for heat sealed sachets |
EP0937574A2 (en) * | 1998-02-18 | 1999-08-25 | HETZEL GmbH & Co. KG | Method and device for the continuous production of plastic sleeves |
US6626811B2 (en) | 2000-03-16 | 2003-09-30 | Fas Converting Machinery Ab | Method and machine for working an elongate web of material |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10029407B2 (en) | 2014-12-04 | 2018-07-24 | Big Heart Pet, Inc. | Apparatus, processes, and systems for heat sealing |
CN107443761A (en) * | 2016-06-30 | 2017-12-08 | 浙江汇锋薄膜科技有限公司 | A kind of film bonder |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2301771A (en) * | 1940-06-10 | 1942-11-10 | Milprint Inc | Art of producing receptacles |
US2866392A (en) * | 1956-07-25 | 1958-12-30 | Continental Can Co | Pouch manufacturing means and method |
US2909969A (en) * | 1958-06-12 | 1959-10-27 | Poly Cut Corp | Bag forming and sealing machine |
US3793927A (en) * | 1972-05-18 | 1974-02-26 | A Emond | Bag making machine |
US4123956A (en) * | 1977-09-12 | 1978-11-07 | Arco Industries Corporation | Self-adjusting punch device |
US4273015A (en) * | 1979-06-04 | 1981-06-16 | Johnson Donald R | Dome head punch |
US4599926A (en) * | 1984-07-16 | 1986-07-15 | Preston Engravers, Inc. | Rotary cutting dies with vacuum assist to cut and clear waste |
US4674372A (en) * | 1986-07-28 | 1987-06-23 | Milliken Research Corporation | Hole punch |
EP0267706A1 (en) * | 1986-10-24 | 1988-05-18 | William F. Brown | Bag bundles and method of and apparatus for manufacture |
-
1989
- 1989-12-01 DE DE89830531T patent/DE68907475T2/en not_active Expired - Fee Related
- 1989-12-01 EP EP89830531A patent/EP0377416B1/en not_active Expired - Lifetime
- 1989-12-01 AT AT89830531T patent/ATE91250T1/en not_active IP Right Cessation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2301771A (en) * | 1940-06-10 | 1942-11-10 | Milprint Inc | Art of producing receptacles |
US2866392A (en) * | 1956-07-25 | 1958-12-30 | Continental Can Co | Pouch manufacturing means and method |
US2909969A (en) * | 1958-06-12 | 1959-10-27 | Poly Cut Corp | Bag forming and sealing machine |
US3793927A (en) * | 1972-05-18 | 1974-02-26 | A Emond | Bag making machine |
US4123956A (en) * | 1977-09-12 | 1978-11-07 | Arco Industries Corporation | Self-adjusting punch device |
US4273015A (en) * | 1979-06-04 | 1981-06-16 | Johnson Donald R | Dome head punch |
US4599926A (en) * | 1984-07-16 | 1986-07-15 | Preston Engravers, Inc. | Rotary cutting dies with vacuum assist to cut and clear waste |
US4674372A (en) * | 1986-07-28 | 1987-06-23 | Milliken Research Corporation | Hole punch |
EP0267706A1 (en) * | 1986-10-24 | 1988-05-18 | William F. Brown | Bag bundles and method of and apparatus for manufacture |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767306A1 (en) * | 1997-08-12 | 1999-02-19 | Morvan Sous Traitance | Manufacturing method for heat sealed sachets |
EP0937574A2 (en) * | 1998-02-18 | 1999-08-25 | HETZEL GmbH & Co. KG | Method and device for the continuous production of plastic sleeves |
EP0937574A3 (en) * | 1998-02-18 | 2000-04-26 | HETZEL GmbH & Co. KG | Method and device for the continuous production of plastic sleeves |
US6626811B2 (en) | 2000-03-16 | 2003-09-30 | Fas Converting Machinery Ab | Method and machine for working an elongate web of material |
Also Published As
Publication number | Publication date |
---|---|
EP0377416B1 (en) | 1993-07-07 |
DE68907475D1 (en) | 1993-08-12 |
DE68907475T2 (en) | 1993-10-21 |
ATE91250T1 (en) | 1993-07-15 |
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