FR2510943A1 - METHOD AND MACHINE FOR MANUFACTURING A TUBULAR CARDBOARD CYLINDER, IN PARTICULAR A BODY OF FUTURE AND CYLINDER OF CARDBOARD PRODUCED THEREBY - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A PROCESS AND A MACHINE FOR MANUFACTURING TUBULAR CARDBOARD CYLINDERS SUCH AS A DRUM BODY. THE MACHINE, ACCORDING TO THE INVENTION INCLUDES A FEEDING REEL 1 IN PAPER 4, FEEDING ROLLS 2, 2A OF THE STRIP OF PAPER ON A CYLINDRICAL CHUCK 3, A COUNTER ROLL 10 COMING IN CONTACT WITH LEDIT CHUCK 3 FOR ENSURE THE WRAP-UP OF THE SHEET OF PAPER, A CUTTING DEVICE 7 OF THE PAPER AND OF THE SIZING MEANS 8 PRIOR TO THE PAPER CHARACTERIZED IN THAT IT INCLUDES MEANS OF DETECTION AND MEASUREMENT 17 OF THE LENGTH OF UNWINDED PAPER AT LEAST AT THE BEGINNING OF EACH MANUFACTURING CYCLE AND CONTROL MEANS SUBJECT TO THESE MEASURING MEANS TO CONTROL IN PARTICULAR THE IMPLEMENTATION OF THE PAPER SIZING MEANS 8. THE PRESENT INVENTION APPLIES IN PARTICULAR TO THE FIELD OF THE PAPER INDUSTRY.

Description

The subject of the present invention is essentially a method of

  manufacture of a tubular cylinder

  cardboard and a machine for carrying out this method.

  The invention more specifically relates to a method of manufacturing a cylindrical and tubular body of cardboard for fufeNotamment used for the packaging of

solid or liquid product.

  It is already known to manufacture cylindrical and tubular bodies of cardboard drums by winding a strip of paper in several layers on a mandrel, the paper being previously glued on its face facing the mandrel, with the exception of the paper constituting the

first inner layer of the body.

  In this known method the paper is unwound from a spool and is fed onto the mandrel so that the front end transverse edge of the paper web abuts against a limit switch located under the mandrel L This switch is actuated by the paper tape to control the application of the paper on the mandrel and its winding around it. To avoid defiling the mandrel with the glue, the glue first rolls a first layer of unsized paper on a mandrel. a revolution and a certain length of safety During this revolution, a cam integral with the mandrel actuates a switch for the putting into operation of the gluing device so that the turn being completed, the glued paper arrives near its point of tangency with the mandrel Then, the winding of the paper is continued to obtain the desired thickness of the roll the rotation of the mandrel, the cutting of the paper being controlled and controlled by Turning counters of said mandrel This known method has a main disadvantage which lies in the inaccuracy of the control of implementation.

  of the gluing device die the paper web.

  Indeed, the positioning of the Enfler pa '' abutment strip or the limit switch, located under the mandrel is very imprecise because of the great flexibility of the paper strip which is a function of its flexibility and the speed of paper scroll The positioning variations of the paper sheet are of the order of about 100 mm This inaccuracy causes a delay in the actuation of the stop o a risk that the

  glued side of the paper comes into contact with the mandrel.

  In the known method, in order to avoid contaminating the mandrel, it was provided with a long safety lenght of the safety device before the release of the relatively large sizing device (of the order of 100 mm) during the winding of the first layer of paper on the mandrel, which resulted in the presence of a tab or bib of unbound paper inside the barrel body that was necessary to cut after the removal of the drum This operation causes a waste of time

and matter.

  The main object of the present invention is to remedy this drawback by proposing a manufacturing method that makes it possible to trigger the implementation of the sizing device accurately and thus to eliminate the presence of the tongue and thus to realize

  saving time and material.

  To this end, the subject of the invention is a method for manufacturing a tubular cardboard cylinder such as a drum body by winding a paper web, for example of paper especially used for packaging and known in the art. the commercial name of Kraft paper, or the like, in several layers on a mandrel, of the type consisting of winding a layer of paper tape on said mandrel, then continuing the winding of said strip of paper after having previously glued the face of the paper web of the following layers facing said mandrel, to cut said strip of paper after winding up the number of desired layers, and to remove said cylinder thus manufactured and then start again successive cycles of manufacture, characterized in that it consists measuring and controlling the length of paper web rolled at least at the beginning of each manufacturing cycle, and to trigger the aforementioned sizing operation of one side of the web of paper when the measured length of paper unrolled reaches a reference value, so that at the beginning of each manufacturing cycle a length of unsized paper equal to or slightly greater than the perimeter of the mandrel is wound on said mandrel to constitute the first

layer of paper.

  Thus, by a measurement operation and precise control of the length of paper sheet unrolled and scrolling in the production line, it is possible to trigger the gluing of the paper to remove or significantly reduce the tongue or flap not glued present on the inner face of the manufactured cylinder. According to another characteristic of the invention,

  at the beginning of each production cycle, the banana is

  of paper on the mandrel by an intermittent automatic drive with time control Thus, it is no longer necessary to provide a limit switch forming a stop for

  the front transverse end of the paper web.

  The present invention also relates to a machine for carrying out the method described above, of the type comprising a paper feed reel, rollers for feeding the paper web on a cylindrical mandrel such as a drum , cylinder or the like, said mandrel having means, for example a pneumatic nozzle or the like, for applying and holding at least a portion of the aforesaid first layer of paper on its surface, a counter-roller contacting said mandrel for winding up of the paper sheet, a cutting device for cutting the paper web, pre-gluing means of the face of the paper facing the mandrel and means for controlling the number of rotations of the mandrel for controlling the drive. of it and / or the cutting device, characterized in that it further comprises means for detecting and measuring the length of paper unwound at the beginning of each cycle of manufacture. n and control means slaved to these measuring and detection means for periodically transmitting a control signal for the implementation of said sizing means. Advantageously, the aforementioned means of detection, measurement and control consist of a system

  electronic device preferably comprising a photoelectric member

  For example, at least the above-mentioned measurement and detection means are mounted before the gluing means mentioned above.

  the scrolling direction of the unwound paper strip.

  According to another characteristic of the invention, the machine comprises a timed electronic control system, preferably with adjustable delay of the drive of the aforementioned paper feed rollers

on the cylinder.

  The present invention also relates to a tubular cardboard cylinder product such as an iron body or the like obtained by the method described above. Other features, details and advantages of the invention will appear more clearly in the light

  the following explanatory description, made in

  reference to the attached schematic drawings illustrating an embodiment, given solely by way of example and in which: Figure 1 is a schematic vertical longitudinal sectional view of an embodiment of a manufacturing machine according to the invention; , and Figure 2 is a partial top view along the arrow II of Figure 1 illustrating the positioning of the detection, measuring and control means according to the invention. Referring to FIG. 1, a machine for making tubular rolls made of cardboard from strip paper, advantageously a paper used for packaging and known under the trade name Kraft paper, includes

  conventional and successively a coil 1 of food

  paper, advantageously with braked unwinding, a device for feeding rollers 2 for pulling said

  paper tape and bring it on a 3 reel mandrel.

  Throughout its scrolling the paper strip 4 is kept under tension and guided by rolls of

guidance 5.

  Advantageously, the strip 4 of paper passes into a device 6 known per se for breaking the paper fibers In addition, the paper scrolls in a cutting device 7 and a device 8 for sizing one of its faces Moreover, fixed or movable devices 9 for guiding and supporting the paper web are arranged to guide the paper web 4 on the mandrel These devices may be advantageously constituted by parallel rods of any length forming a support table

for paper.

  Cooperating with the mandrel 3, there is provided a counter-roller 10 which can be moved by any system 11 such as cylinder, lever or the like to bring it into contact with the mandrel 3 which comprises means (not shown) such a suction or vacuum ramp, for example, to apply and maintain at least a portion of the first layer of

paper wound on the mandrel 3.

  It is understood that the manufacturing machine of the invention comprises means for driving the mandrel 3 in rotation, driving means for the cutting device 7, feed rollers 2 and gluing means 8, as well as counters for checking and totalizing the number of turns of the mandrel, in other words all the elements necessary for the operation of such a machine These different means and elements are not shown in the drawings,

for the sake of simplification.

  The gluing means 8 are conventionally constituted by an adhesive reservoir 18 disposed above two rollers 12 and 13 rotating in opposite directions so as to cause a film of glue on their surface. When the gluing means are set a pressure roller 14 disposed beneath the gluing roll 12 is actuated to press the paper web 4 against said gluing roll 12, as shown in solid lines in FIG. 1. On the contrary, when the gluing means 8 are not not implemented, the pressure roller 14 is brought into the low position (shown in dashed line in FIG. 1) so that the paper strip 4 is no longer in contact with

the gluing roll 12.

  The cutting device 7 is constituted by a first roller 15 comprising fixed on one of these generatrices a tapered blade, and a second roller 16 mounted facing said first roller 15 and comprising at its periphery a layer of rubber In a preferred embodiment of the invention, during the implementation of the cutting device 7, the roller 15 is rotated at a speed substantially equal to the speed of travel of the paper, the blade 15 to penetrate into the rubber layer of the roller 16 to cut the

  strip 4 of paper passing between the two rollers 15 and 16.

  It is understood that these embodiments of the gluing means 8, the cutting device 7 are given by way of example and can be any

  without departing for that from the spirit of the invention.

  According to the invention, means 17 for detecting and measuring the length of the paper unwound and scrolling in the machine from the beginning of each production cycle mounted, dns = preferred embodiment of the invention end of axis a roller 2a of the device 2 of feed rollers, as illustrated in FIG.

  for detection and measurement are for example a photoelectric

  slotted disc, and are connected to a control device (not shown) constituted for example by an electronic system comparing the measured value of the length by said means 17 to a predetermined reference value, and emitting a signal when the measured value is equal to the reference value for controlling the implementation of the gluing means 8, that is to say the rotation of the gluing rollers 12, 13 and the displacement of the pressure roller 14 to apply the strip 4 against

the roll 12.

  By way of example, these detection means can be

  consisting of the commercial LS 800 detector assembly

  ELESTA, and the control means consist of the servo-electronic counter-counter assembly.

  type H 7 4 D marketed under the trademark OMRON.

  We will now describe the operation of the machine

  of manufacture according to the invention.

  This manufacturing machine operates in cycles of manufacture.

  successive citations, and as a result we will simply describe

  the stages of a manufacturing cycle.

  At the beginning of the manufacturing cycle of a tubular cylinder

  cardboard or barrel body, the front transverse end of the paper web 4 is fed by the feed rollers 2 to the mandrel 3 This end is guided by the various supports 9 so as to come into contact against the surface said mandrel substantially between the mandrel 3 and the counter roller 10 It is understood that at the beginning of each cycle, the gluing means 8 are not implemented and therefore

  the pressure roller 14 is in the low position.

  Furthermore, according to the invention from the beginning of the manufacturing cycle, in other words as soon as the section of the paper web is cut, the control and detection means 17 detect and memorize the length of paper that passes between the rolls of paper. 2 in the case where these means 17 are mounted end of axis of a

feed rollers.

  According to the invention, the transverse front end of the paper web is brought into contact with the mandrel 3 by the feed rollers 2, the drive of which is controlled by a timed control, advantageously with an adjustable time delay. This timing thus triggers the implementation. suction means incorporated in the mandrel 3 and the rise of the counter-roller 10 -to come into contact with the mandrel and thus tighten

  the paper web 4 against the mandrel 3.

  The mandrel is then rotated, advantageously at a progressive speed, so as to

  to roll up a first layer of unsized paper.

  When the value stored and detected by the detecting and measuring means 17 for detecting the paper length reaches a reference value, control means slaved to these measuring and detecting means 17 emit a signal to control the setting. the aforementioned sizing means 8, in other words the rotation of the glue rollers 12, 13 and the displacement in the up position of the pressure roller 14 It is understood that the reference value is calculated as a function of the distance separating the detection means 17 from the gluing means and the mandrel, so that a length of unsized paper equal to or slightly greater than the perimeter of the mandrel is wound on said mandrel to constitute the

first layer of paper.

  Thus, as the measurement of the length of the paper 9 unwound and scrolling in front of the detection and measurement means 17 is a linear measurement, so very accurate it is possible to precisely coincide the front edge of paper to be glued with the front transverse end of the strip of paper wound on the mandrel 3, and thus remove the tongue or flap not glued inside the inner face

of the drum body manufactured.

  However, to avoid any risk of staining of the mandrel, it is advantageous to provide a length

  safety which is for example of the order of about 3 mm.

  Continuing the winding of the paper web 4 previously glued on the mandrel 3 to obtain the desired thickness of the cardboard cylinder This thickness is advantageously controlled by the number of turns of the

  chuck totalized for example by two revolution counters.

  Thus, the first revolution counter triggers the cutting device 7 when the number of turns of the mandrel reaches a given value, and the second counter triggers the stopping of the mandrel preferably with a repositioned position, after advantageously an additional rotation of the mandrel without paper winding to complete the bonding of the outer layer Then the mandrel is uncompressed and the cardboard cylinder is removed after the movement of the

against roller.

  The machine is then ready to recommence a manufacturing cycle by driving the feed rollers 2 to bring the front transverse end of the web

of cut paper on mandrel 3.

  Thus, it is possible to obtain, according to the method of the invention, tubular cardboard cylinders no longer having flap or tongue not glued on the inner surface of said cylinders, or simply a tongue of peripheral length less than 3 mm, so having no disadvantage when using 2 n of these cylinders as barrel Oros for 3 the iticeo u

  solid or liquid products for example.

  Thus, it is no longer necessary to provide the cut of this flap, which caused a loss

of time and matter.

  Of course, the invention is not limited to the embodiment described and shown which has been given as an example. Thus, the control of the drive means of the mandrel 3, the section 7 can be any and the location of the means 17 for detecting and measuring the length of the paper strip 4 unwound, without

  for that, out of the scope of the invention.

Claims (4)

R E V E N D I C A T IO N S   A method of manufacturing a tubular cardboard cylinder such as a barrel body by winding a paper web in a plurality of layers on a mandrel, such as winding a layer of paper on said mandrel, and then continuing with winding said strip of paper, after having previously glued the paper face of the following layers facing said mandrel, cutting said strip of paper after winding the desired number of layers, removing said cylinder thus manufactured and then starting cycles again successive manufacturing processes, characterized in that it consists in measuring and controlling the length of paper strip unwound at least at the beginning of each cycle   of manufacture, and to trigger the aforementioned sizing   one side of the paper web when the measured length of paper unrolled reaches a predetermined reference value, so that at the beginning of each production cycle a length of unsized paper equal to or slightly greater than the perimeter of the mandrel is wound on said mandrel to constitute the first layer of paper.   2 Process according to claim 1, characterized in that, at the beginning of each production cycle, the strip of paper is fed to the mandrel by means of an intermittent automatic drive with timed control. 3 Machine for carrying out the process according to claim 2 1 or 2 of the type comprising a paper feed reel, rollers for feeding the paper web on a cylindrical mandrel, said mandrel comprising means, for example sucking means for applying and holding at least a portion of the first layer; of paper on its surface, a counter-roller contacting said mandrel to ensure the winding of the paper sheet, a cutting device of the paper web, means for gluing the paper face facing the mandrel, and means for controlling the number of rotations of the mandrel for controlling the driving of said mandrel and / or the cutting device, characterized in that it further comprises means for s detection and measurement of the length of paper unwound at least at the beginning of each manufacturing cycle, and control means slaved to these measuring and detection means for periodically emitting a signal to control the implementation of the means of d sizing above. 4 Machine according to claim 3, characterized in that the aforementioned means of measurement and control are constituted by an electronic system preferably comprising a photoelectric body discs to slots, for example.   Machine according to claim 3 or 4, characterized in that at least the aforementioned means of detection and measurement are mounted before the aforementioned sizing means in the direction of travel of the paper tape unrolled.   Machine according to one of Claims 3 to 5,   characterized in that it comprises a timed electronic control system, preferably with an adjustable time delay, for driving the feed rollers above mentioned paper.   Tubular tubular cylinder product, such as barrel body or the like, characterized in that it is obtained by the process according to claim 1 -or 2 -