EP3233461B1 - Verfahren und maschine zur herstellung von beuteln - Google Patents

Verfahren und maschine zur herstellung von beuteln Download PDF

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Publication number
EP3233461B1
EP3233461B1 EP15820494.1A EP15820494A EP3233461B1 EP 3233461 B1 EP3233461 B1 EP 3233461B1 EP 15820494 A EP15820494 A EP 15820494A EP 3233461 B1 EP3233461 B1 EP 3233461B1
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EP
European Patent Office
Prior art keywords
pair
bag
cylinders
tubular body
separation
Prior art date
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Active
Application number
EP15820494.1A
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English (en)
French (fr)
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EP3233461A1 (de
Inventor
Vincent SCHALCK
Dominique Morel
Freddy OBERHAUSSER
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Holweg Group SAS
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Holweg Group SAS
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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
    • B31B70/005—Making flexible containers, e.g. envelopes or bags involving a particular layout of the machinery or relative arrangement of its subunits
    • 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
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/146—Cutting, e.g. perforating, punching, slitting or trimming using tools mounted on a drum
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B31B70/18—Cutting 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
    • 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
    • B31B2150/003—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
    • B31B2160/10—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
    • B31B2160/102—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents obtained from essentially rectangular 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
    • B31B2160/10—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
    • 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
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/148—Cutting-out portions from the sides of webs or 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting 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
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/26—Folding sheets, blanks or webs
    • B31B70/262—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement
    • B31B70/266—Folding sheets, blanks or webs involving longitudinally folding, i.e. along a line parallel to the direction of movement involving gusset-forming

Definitions

  • the present invention relates to a method of manufacturing bags according to which, starting from a hose having transverse perforation lines delimiting legs of the future bag, two separation steps are carried out along the perforation lines to separate two successive bags and a waste remaining on one of the bags between the two legs. It also relates to a machine implementing said method.
  • a technique which consists in forming a casing from a sheet of rolled paper, separating sections from this casing and closing one end of the section to form a bag.
  • the hose can also be formed with a plastic part, for example transparent, assembled by gluing with the paper by covering the respective edges.
  • the document FR 786 579 shows several examples of this technique. It shows in particular on figures 7 to 10 a manufacturing process in which the paper strip is provided at regular intervals with transverse perforation lines, with a single line in the center and two lines, respectively of opening and bottom, offset on either side with respect to the central line on each side of the sheet, the bottom line being seen as arriving after the central line in the direction of movement of the paper, the opening line being seen as arriving before the central line.
  • Perforation lines connect the bottom line and the opening line to the center line at an angle.
  • the hose is formed by folding each edge over the central part and gluing the two edges between them along a central junction.
  • the hose thus formed passes between a pair of drive rollers which drive the hose at a constant speed.
  • the hose passes between a pair of separation rollers rotating with a peripheral speed greater than that of the drive rollers before being driven to a folding device.
  • One of the rollers of the pair of separation rollers is hollowed out over a large part of its periphery so as to come into contact with the other roller only intermittently. During this contact, which occurs between the opening line and the central line, the hose is tensioned between the drive rollers and the separation rollers so as to obtain the separation of a section from the hose at the level of the central perforation line and the bottom lines.
  • the front part of the section which has just been separated is then gripped by the folding device which rotates with a peripheral speed greater than that of the pair of separation rollers.
  • the pair of separation rollers maintains at this time the separate section between the central line and the bottom line, that is to say only the upper part of the section, so that the part of the section between the line of opening and the bottom line is separated from the section forming a waste.
  • the waste is driven downwards by the lower roller of the pair of separation rollers provided for this purpose with pins which are planted in the waste between the central line and the bottom line.
  • a rear tab is thus formed on the section, as is a front tab at the end of the hose. This front leg will be found on the next section.
  • the front and rear legs are located on the same side of the section, that is to say at the bottom.
  • the front tab is glued and folded by the folding device to close the front part of the section.
  • peripheral speed ratios between the drive rollers, those of separation and the folding device are generally fixedly determined by mechanical drives from the same drive motor.
  • Seizure of waste from the rear side imposes limitations on the speed of operation of the machine. Indeed, the front part of the waste can turn over because it is not maintained. This phenomenon is particularly noticeable with a long length of waste and with a high rate. When the front part turns over, it can cause the detachment of the waste which then risks getting stuck on the way of its evacuation.
  • the document FR 829 591 proposes adding a pair of cylinders between the pair of separation rollers and the folding device, in order to be able to perform the separation function in place of the folding device. This document also proposes to add a pair of auxiliary rollers between the drive rollers and the separation rollers, pinching the hose only during the tearing operation.
  • the document FR 1,159,929 proposes to distinguish the two separation operations by providing two stations between which takes place the separation between the section and the hose and two other stations between which the second separation takes place between the section and the waste. This arrangement tends to make the manufacturing machine bulky and expensive due to the multiplication of the number of stations. It can only be applied to a machine the dimensions of which have been designed to accommodate additional stations, which is not the case as standard.
  • the invention aims to provide an alternative arrangement which simplifies the construction of the machine implementing the manufacturing process, which allows a compact machine and which facilitates the implementation of the process during adjustment according to the format of the bags to be produced. It also aims to be able to be applied to existing machines the size of which does not allow receiving additional stations. The invention also aims to solve the problem of disposing of waste at high speed.
  • the invention relates to a method of manufacturing a bag according to which, from a hose comprising lines of transverse perforations delimiting a rear end of a first bag and at least one front tab of a second bag following the first between a central line and a bottom line, in a first step, the first and second bags are separated and, in a second step, a waste remaining on one of the bags between the rear end and the front leg, characterized in that the first and second stages are carried out between on the one hand a first pair of separation cylinders and on the other hand a second pair of separation cylinders downstream of the first pair of separation cylinders relative to the direction of travel of the hose, the waste being pinched between the central line and the bottom line between the cylinders of the first pair during the first step to be retained on the second bag, could is pinched and torn off by the second pair during the second step, the first pair of cylinders being driven by a peripheral speed lower than that of the second pair at least during the first and the second step
  • the method according to the invention makes it possible to produce the bags according to the same principle as in the prior art, but with only two pairs of separation cylinders, while the prior art required at least one additional pair of cylinders to perform the second separation .
  • the machine implementing the method according to the invention can thus be more compact since it uses the same two pairs of cylinders to carry out the two separation steps. Therefore it is less expensive by reducing the number of pairs of cylinders and by reducing the size of the machine.
  • Another advantage is that the waste is carried at the front of the second bag, which makes it possible to grasp it from the front for its evacuation. Even if it is long, its evacuation is not affected, the long part being behind and not likely to turn over or come off. Indeed, in the prior art, when the waste remains attached to the rear of the first bag, the only possibility for grasping it is the rearmost part, and it becomes difficult to guide it during its evacuation, in particular in case of great length of the waste.
  • the hose is driven upstream of the first pair of cylinders by a pair of drive rollers rotating at constant peripheral speed called the reference speed, the peripheral speed of the first pair of cylinders being less than the speed of reference during the first and second stage.
  • the hose is thus retained by the first pair of cylinders, the part of the hose between the pair of drive rollers and the first pair of cylinders being relaxed and until sometimes can temporarily form a ripple. This possible ripple is subsequently absorbed when the first pair of cylinders no longer pinches the hose.
  • the speed of at least one of the cylinders of the first pair of cylinders is adjusted between the second and the first step so that the clamping of the waste between the cylinders of the first pair is synchronized with the clamping and the tearing of the first bag by the second pair of cylinders.
  • the length of the bag must be adjustable on the machine.
  • the length of hose which runs between the pinching on the bag during the first and then the second step corresponds substantially to the distance between the first and the second pair of cylinders.
  • the pinching by the first pair of cylinders takes place at the level of the waste between the central line and the bottom line, to maintain it with the second bag.
  • the pinching during the second step takes place when the waste maintained on the second bag is at the level of the second pair of cylinders, therefore after a course of a substantially fixed distance, which does not depend on the length of the bag.
  • the interval between the tightening of the second step and that of the first step for the next bag is a function of the length of the bag. It may therefore be advantageous to adjust the speed of rotation of the first pair of cylinders between the second and the first step to adapt the cycle to the length of the bag.
  • the rotation speed of the cylinders is adjusted, for example, by the use of a controlled synchronous electric motor.
  • the means for adjusting the speed of the first pair of cylinders can also be used to adapt the peripheral speed during the first and second stages so as to limit the difference with the speed of travel of the hose.
  • the end of the hose has very little delay after the first separation step with respect to the normal travel, and it is then not necessary to provide take-up rollers downstream of the first pair of cylinders.
  • the speed difference can be adjusted for each type of production, depending on the size of the bags and the nature of the casing material.
  • the speed of at least one of the cylinders of the second pair of cylinders is adjusted between the second and the first step so that the tightening of the first bag between the cylinders of the second pair is synchronized with the pinching of the waste from the first pair of cylinders.
  • the peripheral speed of the second pair of cylinders is always higher than the peripheral speed of the first pair of cylinders during the first and second stages, but evolves freely between the stages and can be faster and slower than the first cylinders and may be different depending on the size of the bags.
  • the perforation lines further delimit a rear tab at the rear end of the first bag opposite the front tab of the second bag.
  • the invention also relates to a bag making machine comprising means for forming a hose comprising lines of transverse perforations delimiting a rear end of a first bag and at least one front tab of a second bag according to the first, separation means for, in a first step, to separate the first and the second bag and, in a second step, to separate a waste remaining on one of the bags between the rear end and the front tab, the machine being characterized in that the separation means comprise a first pair of separation cylinders, driven by first drive means, and a second pair of separation cylinders, driven by second drive means, the separation means being configured to pinch the waste between the cylinders of the first pair during the first step and retain it on the second bag while the first bag is pinched between the second e pair of separation cylinders, and to pinch the waste and tear it off with the cylinders of the second pair during the second step while the second bag is pinched between the first pair of separation cylinders, the first and second means drive imparting a peripheral speed to the first pair of cylinders
  • a main cylinder of the second pair of separation cylinders comprises gripping means for gripping the waste during the second step.
  • the gripping means make it possible to carry the waste in the rotation of the cylinder which comprises these means. These are conventionally a row of pins, but it can also be a suction cup or an adherent surface. Other means are provided for then removing the waste from the gripping means.
  • the main cylinder of the second pair of separation cylinders comprises a bar for pinching the hose, the gripping means being retractable so as to be retracted during the first step.
  • the same bar performs the tightening during the first and the second step, which requires that the gripping means be retracted during the tightening of the first step.
  • the main cylinder of the second pair of separation cylinders comprises a first tear-off bar for pinching the hose during the first step and a second tear-off bar for pinching the hose during the second step, the gripping means being arranged in the environment of the second tear bar.
  • Each of the bars is dedicated to one of the stages, which makes it possible to carry out the two stages during a rotation cycle of the main cylinder.
  • the main cylinder of the second pair of cylinders comprises at least two tear-off bars, the gripping means being arranged in the environment of all the tear-off bars or of a tear-off bar out of two to pinch the hose during the first stage with a bar not fitted with a gripping device or whose gripping system is retracted and a second pull-out bar with a functional gripping device to pinch the hose during the second step and grab the waste.
  • the second drive means it is possible using the second drive means to carry out the pinching steps for the first step either with the same bars or with bars different from those used during the second step.
  • the two stages can be carried out, depending on the settings adopted, in less than one revolution of the main cylinder, one revolution or even more than one revolution, which allows a high rate over the entire range of formats.
  • the tear-off bars can be arranged regularly or offset differently.
  • a main cylinder of the first pair of separation cylinders comprises a retaining bar for pinching the hose during the first and the second step. Tightening on the bar is limited to carrying out the separation steps, which leaves the possibility of giving the main cylinder which carries it or the pair of cylinders an unconstrained speed of rotation outside these steps.
  • the same bar is used for the first and for the second stage, which allows a compact production with a small diameter for the first pair of cylinders.
  • a main cylinder of the first pair of separation cylinders comprises a first holding bar for pinching the hose during the first step and a second holding bar for pinching the hose during the second step.
  • the two stages are carried out during the same revolution of the main cylinder, which allows a high rate.
  • the two retaining bars can be arranged opposite one another or offset differently.
  • a counter-cylinder of the first or of the second pair of cylinders comprises an eroded zone, the corresponding drive means being configurable so that the first tear-off bar or the second tear-off bar is opposite the area eroded intermittently during the rotation of the main cylinder.
  • the eroded area can take the form of a groove, a flat or any other form locally reducing the radius of the cylinder and extending along a generatrix of the cylinder.
  • the counter-cylinder may include several eroded zones.
  • a machine is shown schematically on the figure 1 . It successively comprises, in the direction of unwinding, a reeling device 1 receiving a strip of paper 2 on a reel to unwind it, a punching station 3 for making perforations transversely on the paper strip 2 which is unwinding, a training station for 'a hose 4, separation means 5 for separating the hose 20 into successive bag blanks, a folding device 6 to form the bottom of each bag and a receiving table 7 for stacking the bags produced.
  • the hose formation station 4 ends with a pair of drive rollers 40 rotating at a constant peripheral speed called the reference speed.
  • the machine further comprises means of transport, not shown, arranged between the different stations to guide and transport the hose 20 or the blanks between the stations. Only the separation means 5 are modified in the context of this invention, the other equipment will therefore not be described in detail.
  • the hose 20 shown has gussets 21, but it should be understood that the invention also applies to a hose 20 simple, for bags provided without gussets.
  • the hose 20 has an upper face 22 facing a lower face 23, the faces 22, 23 being connected together by the side gussets 21.
  • the hose 20 is produced by gluing together the edges of the original paper strip 2, the superimposed edges being found substantially in the middle 24 of the upper face 22.
  • the hose 20 is intended to be separated into a first bag 27, a waste 26 and a second bag 28 following the first bag 27, knowing that in the next cycle, the first bag 27 will be replaced by the second bag 28 and so on.
  • the first bag 27 has a rear tab 232 coming from the lower face 23 of the hose 20, and delimited by a central line 233 in the transverse direction and two oblique lines 234 joining the gussets 21.
  • the gussets 21 and the upper face 22 are cut at the same transverse level with an opening line 235 from which the rear tab 232 projects rearwards.
  • the second bag 28 has a front tab 231 coming from the lower face 23 of the hose 20, and delimited by the central line 233 in the transverse direction and two oblique lines 234 joining the gussets 21.
  • the gussets 21 and the upper face 22 are cut at the same transverse level of a bottom line 236 from which the front tab 231 projects forward.
  • the part of the hose 20 delimited between the oblique lines 234 and between the bottom 236 and opening 235 lines on the upper face 22 forms the waste 26 which will be extracted.
  • the rear tab 232 of the first bag 27 is thus opposite the front tab 231 of the second bag 28.
  • the perforation station 3 performs perforations over the entire width of the paper strip 2, at regular intervals.
  • the perforations extend along the central line 233, oblique lines 234, the opening line 235 and the bottom line 236 delimiting the bags on the upper face 22 and the gussets 21.
  • the separation means 5 of the manufacturing machine comprise a first pair of separation cylinders 51 driven by first drive means 53, and a second pair of separation cylinders 52, driven by second drive means 54.
  • the cylinders of the same pair in the upper part rotate at the same peripheral speed as the cylinders in the lower part but in opposite directions, so as to accompany the passage of the hose 20 between them.
  • the first pair of separating cylinders 51 comprises a first retaining bar 511 and a second retaining bar 512.
  • the second pair of separating cylinders 52 comprises a first tearing bar 521 and a second tearing bar 522
  • the holding bars 511, 512 and tearing bars 521, 522 are fixed to the main cylinder of the corresponding pair, in this case on the cylinder facing the upper face 22 of the hose 20, in a direction of generator of the cylinder and forms a protruding part relative to the surface of the cylinder, so as to form a clamp which clamps the hose when the bar passes opposite the other cylinder, called a counter-cylinder.
  • the counter cylinders are smooth.
  • Gripping means 523 in the form of a row of pins are arranged near the second tear-off bar 522.
  • the process implemented by the machine will now be described, starting with an arbitrary position, knowing that each position is also found in the next cycle.
  • the process is a succession of cycles, a bag being produced for each cycle.
  • first and the second bag 27, 28 are in one piece in the extension of the hose 20.
  • the first bag 27 is located between the cylinders of the second pair of cylinders 52 while the second bag 28 is located upstream of the first pair of cylinders 51.
  • the hose 20 moves in the direction of arrow F1, namely from the first pair of cylinders 51 to the second pair of cylinders 52.
  • the pairs of cylinders 51, 52 driven by the first and second drive means 53, 54, bring the first retaining bar 511 into contact with the front tab 231 of the second bag 28 and the waste 26 by pinching them between the central line 233 and the bottom line 236 while the first tear-off bar 521 comes into contact with the upper and lower faces 22, 23 of the second bag 28 by pinching them.
  • each pair of cylinders 51, 52 namely a peripheral speed lower than the reference speed for the first pair of cylinders 51, induce traction between the first and the second bag 27, 28 so as to obtain their separation along the perforations of the central line 233, the opening line 235 and the oblique lines 236 connecting them, as shown on the Figures 6 and 7 .
  • the rear tab 232 of the first bag 27 is thus formed.
  • the waste 26 remains attached to the second bag 28.
  • the differential peripheral speeds of each pair of cylinders induce a traction between the waste 26 and the second bag 28 so as to obtain their separation along the oblique perforation lines 234 and bottom 236, as shown on the figures 12 and 13 .
  • the front tab 231 of the second bag 28 is thus formed.
  • the waste 26 is rammed forward by the gripping means 523 and removed with the rotation of the main cylinder, in a manner known per se.
  • the folding device 6 glues and then flaps the front tab 231 on the upper face 22 in order to close the end of the bag.
  • This device is conventional and is not described in more detail here.
  • the bars do not exert any clamping on the other cylinder of the pair. Also, these periods without position constraint are used to accelerate or slow down the rotational speeds of the cylinders so that the following toe-in occurs at the chosen time with respect to the position of the hose 20 and at the desired speed. These speed adjustments are adapted for each length of bag.
  • a diagram represents on a first curve c1 the peripheral position of the first pair of cylinders as a function of the scrolling of the rod, on a second curve c2 the peripheral position of the second pair of cylinders and on a third curve the reference position cR for the sausage.
  • the curves c1 and c2 are synchronous, the peripheral speed of the second pair of cylinders 52 being greater than that of the first 51.
  • the speeds, corresponding to the slopes of the curves are such that the speed of the first curve c1 is lower than the speed of the second curve c2 and that of the reference curve cR to achieve the separation between the first and the second bag.
  • the cylinders in the lower part rotate at a constant speed and only the speed of the cylinders which carry the bars are adjusted. It follows a lower inertia of the mobile part which undergoes accelerations. It is however necessary to provide at least one other engine for the counter-cylinders.
  • the invention is not limited to the embodiment which has just been described.
  • the bars can be arranged in pairs on both of the cylinders of the same pair. It is also possible to provide only one bar per pair of cylinders, the cylinders performing two rotations per cycle to carry out the pinching for both the first and the second step. This solution can be applied to one or both pairs of cylinders. When it applies to the second pair of cylinders, the gripping means must be retractable so as to be active only during the second step.

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Claims (12)

  1. Verfahren zur Herstellung eines Beutels, bei dem ausgehend von einem Schlauch (20), der dazu bestimmt ist, in einen ersten Beutel (27), ein Abfallstück (26) und einen zweiten Beutel (28), der auf den ersten Beutel (27) folgt, getrennt zu werden;
    wobei der erste Beutel (27) Folgendes umfasst: eine hintere Lasche (232), die aus einer unteren Seite (23) des Schlauchs hervorgeht und durch eine Mittellinie (233) in der Querrichtung und zwei schräge Linien (234), die an Seitenkanten der unteren Seite (23) des ersten Beutels (27) anschließen, abgegrenzt ist;
    wobei der zweite Beutel (28) Folgendes umfasst: eine vordere Lasche (231) gegenüber der hinteren Lasche (232) des ersten Beutels (27), die aus der unteren Seite (23) des Schlauchs (20) hervorgeht und durch die Mittellinie (233) in der Querrichtung und zwei schräge Linien (234), die an Seitenkanten der unteren Seite (23) des zweiten Beutels (28) anschließen, abgegrenzt ist; wobei eine obere Seite (22) des Schlauchs (20) und die Seitenkanten des zweiten Beutels (28), wenn der Schlauch (20) Verstärkungsfalten (21) umfasst, entlang derselben Querebene einer Bodenlinie (236) geschnitten werden, von der aus die vordere Lasche (231) des zweiten Beutels (28) nach vorne ragt;
    wobei der Schlauch Perforationen umfasst, die sich entlang der Mittellinie (233), der schrägen Linien (234) des ersten Beutels (27) und des zweiten Beutels (28) und der Bodenlinie (236), die die Beutel an der oberen Seite (22) und den Seitenkanten der Beutel abgrenzt, wenn der Schlauch (20) Verstärkungsfalten (21) umfasst, erstrecken;
    - in einem ersten Schritt eine Trennung des ersten und des zweiten Beutels (27, 28) vorgenommen wird und;
    - in einem zweiten Schritt das Abfallstück (26), das an einem der Beutel (28) zwischen dem hinteren Ende und der vorderen Lasche (231) verbleibt, abgetrennt wird;
    dadurch gekennzeichnet, dass der erste und der zweite Schritt zwischen einerseits einem ersten Paar von Trennungswalzen (51) und andererseits einem in Bezug auf die Laufrichtung des Schlauchs (20) dem ersten Paar von Trennungswalzen (51) nachgelagerten zweiten Paar von Trennungswalzen (52) ausgeführt werden, wobei das Abfallstück (26) während des ersten Schritts zwischen der Mittellinie (233) und der Bodenlinie (236) zwischen den Walzen des ersten Paares (51) eingeklemmt wird, um an dem zweiten Beutel (28) zurückgehalten zu werden, und dann während des zweiten Schritts durch das zweite Paar (52) eingeklemmt und abgerissen wird, wobei das erste Walzenpaar (51) mit einer Umfangsgeschwindigkeit bewegt wird, die mindestens während des ersten und des zweiten Schritts geringer als die des zweiten Paares (52) ist.
  2. Herstellungsverfahren nach Anspruch 1, wobei der Schlauch (20) vor dem ersten Walzenpaar (51) durch ein Paar von Antriebsrollen (40), das mit einer konstanten Umfangsgeschwindigkeit, die als Referenzgeschwindigkeit bezeichnet wird, dreht, angetrieben wird, wobei die Umfangsgeschwindigkeit des ersten Walzenpaares (51) während des ersten und des zweiten Schritts geringer als die Referenzgeschwindigkeit ist.
  3. Verfahren nach einem der Ansprüche 1 oder 2, wobei die Geschwindigkeit mindestens einer der Walzen des ersten Walzenpaares (51) zwischen dem zweiten und dem ersten Schritt angepasst wird, um das Klemmen des Abfallstücks (26) zwischen den Walzen des ersten Paares (51) mit dem Klemmen und dem Abreißen des ersten Beutels (27) durch das zweite Walzenpaar (52) zu synchronisieren.
  4. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Geschwindigkeit mindestens einer der Walzen des zweiten Walzenpaares (52) zwischen dem zweiten und dem ersten Schritt angepasst wird, um das Klemmen des ersten Beutels (27) zwischen den Walzen des zweiten Paares (52) mit dem Einklemmen des Abfallstücks (26) durch das erste Walzenpaar (51) zu synchronisieren.
  5. Maschine zur Herstellung von Beuteln, die Mittel zur Bildung eines Schlauchs (20) umfasst, der dazu bestimmt ist, in einen ersten Beutel (27), ein Abfallstück (26) und einen zweiten Beutel (28), der auf den ersten Beutel (27) folgt, getrennt zu werden;
    wobei der erste Beutel (27) Folgendes umfasst: eine hintere Lasche (232), die aus einer unteren Seite (23) des Schlauchs hervorgeht und durch eine Mittellinie (233) in der Querrichtung und zwei schräge Linien (234), die an Seitenkanten der unteren Seite (23) des ersten Beutels (27) anschließen, abgegrenzt ist;
    wobei der zweite Beutel (28) Folgendes umfasst: eine vordere Lasche (231) gegenüber der hinteren Lasche (231) des ersten Beutels (27), die aus der unteren Seite (23) des Schlauchs (20) hervorgeht und durch die Mittellinie (233) in der Querrichtung und zwei schräge Linien (234), die an Seitenkanten der unteren Seite (23) des zweiten Beutels (28) anschließen, abgegrenzt ist; wobei eine obere Seite (22) des Schlauchs (20) und die Seitenkanten des zweiten Beutels (28), wenn der Schlauch (20) Verstärkungsfalten (21) umfasst, entlang derselben Querebene einer Bodenlinie (236) geschnitten werden, von der aus die vordere Lasche (231) des zweiten Beutels (28) nach vorne ragt;
    wobei der Schlauch Perforationen umfasst, die sich entlang der Mittellinie (233), der schrägen Linien des ersten Beutels (27) und des zweiten Beutels (28) und der Bodenlinie (236), die die Beutel an der oberen Seite (22) und den Seitenkanten der Beutel abgrenzt, wenn der Schlauch (20) Verstärkungsfalten (21) umfasst, erstrecken;
    wobei die Maschine Trennungsmittel (5) umfasst, um während eines ersten Schritts eine Trennung des ersten und des zweiten Beutels (27, 28) auszuführen und während eines zweiten Schritts ein Abfallstück (26), das an einem der Beutel (28) zwischen dem hinteren Ende und der vorderen Lasche (231) verbleibt, abzutrennen,
    wobei die Maschine dadurch gekennzeichnet ist, dass die Trennungsmittel (5) ein erstes Paar von Trennungswalzen (51), das durch erste Antriebsmittel (53) angetrieben wird, und ein zweites Paar von Trennungswalzen (52), das durch zweite Antriebsmittel (54) angetrieben wird, umfassen, wobei die Trennungsmittel (5) dazu konfiguriert sind, das Abfallstück (26) während des ersten Schritts zwischen der Mittellinie (233) und der Bodenlinie (236) zwischen den Walzen des ersten Paares (51) einzuklemmen und es an dem zweiten Beutel (28) zurückzuhalten, während der erste Beutel (27) zwischen dem zweiten Paar von Trennungswalzen eingeklemmt ist, und während des zweiten Schritts das Abfallstück (26) einzuklemmen und mit den Walzen des zweiten Paares (52) abzureißen, während der zweite Beutel (28) zwischen dem ersten Paar von Trennungswalzen (51) eingeklemmt ist, wobei die ersten und die zweiten Antriebsmittel (53, 54) eine Umfangsgeschwindigkeit auf das erste Walzenpaar (51) übertragen, die mindestens während des ersten und des zweiten Schritts geringer als die des zweiten Paares (52) ist.
  6. Maschine nach Anspruch 5, wobei eine Hauptwalze des zweiten Paares von Trennungswalzen (52) Greifmittel (523) umfasst, um das Abfallstück (26) während des zweiten Schritts zu packen.
  7. Maschine nach Anspruch 6, wobei die Hauptwalze des zweiten Paares von Trennungswalzen (52) eine Abreißklemme (521) umfasst, um den Schlauch (20) einzuklemmen, wobei die Greifmittel (523) versenkbar sind, um während des ersten Schritts versenkt zu werden.
  8. Maschine nach Anspruch 6, wobei die Hauptwalze des zweiten Paares von Trennungswalzen (52) eine erste Abreißklemme (521), um den Schlauch (20) während des ersten Schritts einzuklemmen, und eine zweite Abreißklemme (522), um den Schlauch (20) während des zweiten Schritts einzuklemmen, umfasst, wobei die Greifmittel (523) in der Nähe der zweiten Abreißklemme (522) angeordnet sind.
  9. Maschine nach Anspruch 6, wobei die Hauptwalze des zweiten Paares von Trennungswalzen (52) mindestens zwei Abreißklemmen (522) umfasst, wobei die Greifmittel (523) in der Umgebung aller Abreißklemmen (522) oder jeder zweiten Abreißklemme angeordnet sind, um den Schlauch (20) während des ersten Schritts mit einer Klemme, die nicht mit einer Greifvorrichtung versehen ist oder deren Greifsystem versenkt ist, und einer zweiten Abreißklemme mit einer betriebsfähigen Greifvorrichtung einzuklemmen, um den Schlauch während des zweiten Schritts einzuklemmen und das Abfallstück (26) zu greifen.
  10. Maschine nach einem der Ansprüche 5 bis 9, wobei eine Hauptwalze des ersten Paares von Trennungswalzen (51) eine Halteklemme umfasst, um den Schlauch (20) während des ersten und des zweiten Schritts einzuklemmen.
  11. Maschine nach einem der Ansprüche 5 bis 8, wobei eine Hauptwalze des ersten Paares von Trennungswalzen (51) eine erste Halteklemme (511), um den Schlauch (20) während des ersten Schritts einzuklemmen, und eine zweite Halteklemme (512), um den Schlauch (20) während des zweiten Schritts einzuklemmen, umfasst.
  12. Maschine nach einem der Ansprüche 5 bis 11, wobei eine Gegenwalze des ersten oder des zweiten Walzenpaares einen ausgehöhlten Bereich umfasst, wobei die entsprechenden Antriebsmittel konfigurierbar sind, damit sich die erste Abreißklemme oder die zweite Abreißklemme während der Rotation der Hauptwalze intermittierend gegenüber dem ausgehöhlten Bereich befindet.
EP15820494.1A 2014-12-19 2015-12-18 Verfahren und maschine zur herstellung von beuteln Active EP3233461B1 (de)

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FR1462928A FR3030352B1 (fr) 2014-12-19 2014-12-19 Procede et machine de fabrication de sacs
PCT/EP2015/080531 WO2016097310A1 (fr) 2014-12-19 2015-12-18 Procédé et machine de fabrication de sacs

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FR3090589B1 (fr) 2018-12-21 2021-04-09 Holweg Group Procédé et machine de séparation de tronçons pour la formation de sacs flexibles
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FR3122847B1 (fr) 2021-05-12 2023-05-12 Holweg Group Procédé et machine de fabrication de sac flexible du type enveloppe, notamment avec renfort
WO2022238301A1 (fr) 2021-05-12 2022-11-17 Holweg Group Sac flexible à fond transformable, son procédé et sa machine de fabrication

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US10792881B2 (en) 2020-10-06
FR3030352A1 (fr) 2016-06-24
WO2016097310A1 (fr) 2016-06-23
FR3030352B1 (fr) 2018-09-07
EP3233461A1 (de) 2017-10-25
US20180036987A1 (en) 2018-02-08

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