EP3049331A1 - Machine for stretch wrapping loads with stretchable film - Google Patents

Machine for stretch wrapping loads with stretchable film

Info

Publication number
EP3049331A1
EP3049331A1 EP14789860.5A EP14789860A EP3049331A1 EP 3049331 A1 EP3049331 A1 EP 3049331A1 EP 14789860 A EP14789860 A EP 14789860A EP 3049331 A1 EP3049331 A1 EP 3049331A1
Authority
EP
European Patent Office
Prior art keywords
film
stretching
magnet
roller
machine
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
Application number
EP14789860.5A
Other languages
German (de)
French (fr)
Other versions
EP3049331B1 (en
Inventor
János GÁL
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.)
Korospack Kft
Original Assignee
Korospack Kft
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 Korospack Kft filed Critical Korospack Kft
Publication of EP3049331A1 publication Critical patent/EP3049331A1/en
Application granted granted Critical
Publication of EP3049331B1 publication Critical patent/EP3049331B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
    • B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/56—Rolling articles with wrappers along a supporting surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B2011/002—Prestretching mechanism in wrapping machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/18—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2210/00—Specific aspects of the packaging machine
    • B65B2210/14—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles
    • B65B2210/20—Details of wrapping machines with web dispensers for application of a continuous web in layers onto the articles the web dispenser being mounted on a rotary arm

Definitions

  • the invention relates to a machine for wrapping loads with stretchable film.
  • the vertical and top surface of loads can also be wrapped using the machine.
  • the load wrapped with the shrinkable cap is rotated by the turntable and a burner nozzle fastened on a vertically moving carriage shrinks the upper and lower parts of the shrinkable cap circularly and the lateral part along a screw line performing a programmed movement.
  • the application of the shrinkable cap provides appropriate protection to the load owing to the wrapping the upper part of the load.
  • the disadvantage of the machine is that the shrink-hood must be made previously and put onto the load.
  • the manufacturing of the cap requires manual labor, in addition the specific demand of film is great, as well as the energy requirement of the shrinking is also great enough.
  • the above mentioned structural units of the machines make possible that the pre- stretched film wraps the load along a screw line as result of the rotating movement of the load and the vertical movement of the film.
  • the stretch of the film, the overlap and the number of film windings can be changed depending on the properties of the load and the requirements of fastening.
  • the patent description of registration number of HUP 210302 discloses a very advantageously applicable machine enabling the stretch wrapping of loads with stretchable film also on the top surface of the load with the film applied for the wrapping of lateral surface.
  • the solution ensures the perfect protection of the goods through continuity of the film, rendering unnecessary applying a shrink hood in this way.
  • the essence of the machine according to the solution is that the film applied for stretch wrapping the lateral surface of the load by winding up along a screw line is led above the load and tilted from vertical position to horizontal one during the rotation of the load. The film is then tilted back to the vertical position during a descending movement and the wrapping of the upper part is made in this way.
  • the machine according to the patent has a base frame, a turntable mounted in it and a mast fastened on the base frame.
  • a carriage vertically moving the film is mounted on the mentioned mast and bushing is supporting the carriage.
  • a shaft is inserted into the bushing and a reel of film is connected to the one end and the tilting actuator is connected to the other end of the shaft.
  • a sensor for the vertical (basic) position and a sensor for the horizontal position are mounted on the base frame, triggering flags mounted on the turntable associated to the corners of the load, as operating elements controlling the tilting.
  • the disadvantage of the machine is that the stretch tension value can attain only the nearest digital value according to the step values, so it cannot be followed proportionally, consequently the tension of the film cannot be set precisely.
  • the film can occasionally be torn by the sharp corners of a load.
  • the film can break to inside the corners of the most loaded lower layers of the loads packed in cardboard and corrugated paper boxes.
  • the swingarm deviating along a circular arc under influence of the tension of the film is pulled or pushed by one or more springs with quasi constant force - between the two end positions of the deviation - to the direction corresponding to the smaller tension of the film.
  • the problem with this solution is that the pulling or pushing force of the springs is not linear along the length of pulling or pushing, consequently a pre-stretching unit with springs has also not linear but progressive behavior.
  • the invention relates to an machine for stretch wrapping vertical and top surface of loads with stretchable film having a base frame, a turntable mounted in it and a mast fastened on the base frame.
  • a carriage vertically moving the film is mounted on the mentioned mast and bushing is supporting the carriage.
  • a shaft is inserted into the bushing and a reel of film is connected to the one end and the tilting actuator is connected to the other end of the shaft.
  • a sensor for the vertical (basic) position and a sensor for the horizontal position are mounted on the base frame, triggering flags mounted on the turntable associated to the corners of the load, as operating elements controlling the tilting.
  • the characteristics of the machine are that it has a swinging film tension setting unit connected to the other end of the pin, which has pre-stretching rollers provided with a pre-stretching motor and fastened to the frame of the film carrying and pre-stretching unit, a leading roller containing an arm provided with a roller, a tension setting pneumatic cylinder having a piston with magnet and an analogous displacement transducer, furthermore a pressure regulator and a frequency changer, where the film winded off from the film reel is led between pre-stretching rollers connected one to another with a transmission and one of them is driven by a pre-stretching motor, then the film is led around a leading roller having an arm moving around a centre of rotation and provided with a roller, this arm is connected to the piston provided with magnet and arranged
  • the turntable of the machine is driven with a turntable driving motor.
  • the piston provided with magnet of the machine is moved between two end positions in relation to the set reference value through the pressure regulator.
  • the Figure 1 shows the schematic representation of the machine, while the Figure 2 shows the regulating elements of the machine and their connections.
  • the Figure 1 shows an advantageous embodiment of the machine.
  • the solution covers among others also those machines having more than two pre-stretching rollers and their drive can be either identical to the one shown or different from it.
  • the base frame 1, the turntable 2 mounted in it and the load 13 is positioned on the turntable 2 are shown in the Figure 1.
  • the carriage 4 vertically moving the film reel 7 is fastened to the mast 3 mounted on the base frame 1 and bushing 5 are formed on the carriage 4.
  • a shaft 6 is inserted into bushing 5, a tilting actuator 8 is connected to the one end and a film tension setting unit 22 is connected to the other end of it.
  • the home position sensor 9 and the horizontal position sensor 10 are arranged on the base frame 1, and (tilting controlling) triggering flags 12 A, 12B, 12C, 12D are controlling the tilting associated to the corners of the load 14, as well as a home position sensor 9 are mounted on the turntable 2.
  • the swinging film tension setting unit 22 fastened to the frame of the film holding and pre-stretching unit 23 has pre-stretching rollers 7A provided with a pre-stretching motor 20, a leading roller 7B containing an arm provided with a roller 7C, a tension setting pneumatic cylinder 16 having an analogous displacement transducer 17 and supplied with a piston provided with magnet 16 A, a pressure regulator 18 and a frequency changer
  • the film winded off from the film reel 7 is led between the pre-stretching rollers 7A connected one to another with a transmission 19 and one of them is driven with the pre- stretching motor 20, then the film is led around a leading roller 7B having an arm moving around a centre of rotation and the arm is provided with a roller 7C.
  • the arm provided with the roller 7C is connected to a piston provided with magnet 16A and the piston provided with magnet 16A is arranged in a tension setting pneumatic cylinder 16 provided with an analogous displacement transducer 17.
  • the piston provided with magnet 16A is connected to a pressure regulator 18 and a frequency changer 15.
  • the frequency changer 15 is connected also to the pre-stretching motor 20 of the pre-stretching rollers 7A.
  • the turntable 2 is driven with a turntable driving motor 21.
  • the piston provided with magnet 16A is moved by a pressure regulator 18 between two end positions in relation to the set reference value.
  • the transmission 19 can be of any usual type, advantageously one with chain, V-belt, gears, timing belt etc.
  • the Figure 2 shows the tension setting pneumatic cylinder 16 having the piston provided with magnet 16A and the analogous displacement transducer 17 connected to the pressure regulator 18.
  • the machine contains a tension setting pneumatic cylinder 16 equipped with a piston provided with magnet 16 A, charged on one side and a pressure regulator 18 connected to it, applicable for setting the tension of the film in relation to an targeted reference value.
  • the tension setting pneumatic cylinder 16 is provided with an analogous displacement transducer 17 measuring the position of the piston provided with magnet 16A.
  • the transducer transforms the position to an electric signal characterizing it and regulates with that the film pre-stretching motor 20 through a frequency changer 15.
  • the piston provided with magnet 16A moves towards the one end position.
  • the rotary speed of the pre-stretching motor 20 is then diminished; it wraps the load 13 with less film during a unit of time until that film quantity during the unit of time becomes equal to or less than the quantity sufficient to wrap the load 13.
  • the load 13 "pulls" the film because of that, it becomes stretched and the force characterizing its tension moves the arm provided with roller 7C towards the position characterizing the tersioned film.
  • the piston provided with magnet 16A of the tension setting pneumatic cylinder 16 will be moved towards the other end position at the same time. Consequently, the analogous displacement transducer 17 sends accelerating signal to the frequency changer 15, which sends accelerating signal to the pre-stretching motor 20.
  • the current position of the piston provided with magnet 16A is regulated by the resultant of the pressure set and the pulling force arising on the film.
  • the pulling or pushing force of the tension setting pneumatic cylinder 16 can be set in the whole length of path, the pressure can be measured, so the stretching force can be repeated.
  • the horizontal axis of the film tension setting unit 22 encloses an angle of twentyfive degrees with the radial direction of the main rotating movement, so the upper edge of the film turned to horizontal on the side of the real or imaginary centre of the main rotating movement is not elongated in such a great extent that it could lose the ability of shrinking back.
  • the pre-stretching motor responds quicker, more accurately and with smaller redundancy under the influence of the increased tension
  • the required value of the film tension can be better approached and kept by means of the regulating action of increased accuracy during the whole duration of the wrapping.
  • the swinging film tension setting unit 22 which can be operated with motor-driven pre- stretching and at several pre-sets of pressure, adjustable in analogous way can be a separate complement of the machine wrapping with stretchable film, which can be built on all types of the machines wrapping with stretchable film, e. g. to the constructions with rotating arm or rotating ring, and the wrapping with film can be solved on a machine wrapping with stretchable film of any type with a relatively small cost using the stretchable film used for wrapping the lateral surfaces of the load 13.

Abstract

The subject of the invention is a machine for wrapping vertical and top surface of loads (13) with stretchable film. The machine of the invention is provided with a swinging film tension setting unit (22) connected to the end of a shaft (6), which unit has pre-stretching rollers (7A) provided with a pre-stretching motor (20), a leading roller (7B) containing an arm provided with a roller (7C), a tension setting pneumatic cylinder (16) provided with an analogous displacement transducer (17) and equipped with a piston provided with a magnet (16A), furthermore a pressure regulator (18) and a frequency changer (15) all fastened to a frame of the film holding and pre-stretching unit (23), wherein the film winded off from the film reel (7) is led between the pre-stretching rollers (7A), one connected to another with a transmission (19) and one of them is driven by a pre-stretching motor (20) then the film is led around the leading roller (7B) having the arm rotating around a center of rotation and provided with the roller (7C), it is connected to the piston provided with the magnet (16A), which is mounted in the tension setting pneumatic cylinder (16), the latter is provided with the analogous displacement transducer (17) and the piston provided with the magnet (16A) is connected to the pressure regulator (18) and the. frequency changer (15), which frequency changer (15) is connected also to the pre-stretching motor (20).

Description

MACHINE FOR STRETCH WRAPPING LOADS WITH STRETCHABLE FILM
The invention relates to a machine for wrapping loads with stretchable film.
The vertical and top surface of loads can also be wrapped using the machine.
There is a great variety of load stretch wrapping machines known in the practice.
Using the machine described in the German publication of registration number DE 3633680 the load is put on a turntable and a shrinkable cap made of a shrinkable film is put on the load.
The load wrapped with the shrinkable cap is rotated by the turntable and a burner nozzle fastened on a vertically moving carriage shrinks the upper and lower parts of the shrinkable cap circularly and the lateral part along a screw line performing a programmed movement.
The application of the shrinkable cap provides appropriate protection to the load owing to the wrapping the upper part of the load.
The disadvantage of the machine is that the shrink-hood must be made previously and put onto the load. The manufacturing of the cap requires manual labor, in addition the specific demand of film is great, as well as the energy requirement of the shrinking is also great enough.
In the last decade the significantly cost effective wrapping with stretchable (ductile) film is applied in more and more increasing degree because of the above mentioned disadvantage of the wrapping with shrinkable film.
The specific demand of film of the wrapping with stretchable film weight approximately one fifth part of that of the shrink hood and the indispensable high energy requirement of the shrinking does not arise. The common distinctive features both of the simplest hand- operated machines and the fully automated ones applied for the stretch wrapping with stretchable film are that they have turntables and a carriage applicable for the vertical movement of the film.
The above mentioned structural units of the machines make possible that the pre- stretched film wraps the load along a screw line as result of the rotating movement of the load and the vertical movement of the film. The stretch of the film, the overlap and the number of film windings can be changed depending on the properties of the load and the requirements of fastening. The patent description of registration number of HUP 210302 discloses a very advantageously applicable machine enabling the stretch wrapping of loads with stretchable film also on the top surface of the load with the film applied for the wrapping of lateral surface.
The solution ensures the perfect protection of the goods through continuity of the film, rendering unnecessary applying a shrink hood in this way.
The essence of the machine according to the solution is that the film applied for stretch wrapping the lateral surface of the load by winding up along a screw line is led above the load and tilted from vertical position to horizontal one during the rotation of the load. The film is then tilted back to the vertical position during a descending movement and the wrapping of the upper part is made in this way.
The machine according to the patent has a base frame, a turntable mounted in it and a mast fastened on the base frame. A carriage vertically moving the film is mounted on the mentioned mast and bushing is supporting the carriage.
A shaft is inserted into the bushing and a reel of film is connected to the one end and the tilting actuator is connected to the other end of the shaft.
A sensor for the vertical (basic) position and a sensor for the horizontal position are mounted on the base frame, triggering flags mounted on the turntable associated to the corners of the load, as operating elements controlling the tilting.
The disadvantage of the machine is that the stretch tension value can attain only the nearest digital value according to the step values, so it cannot be followed proportionally, consequently the tension of the film cannot be set precisely.
As the tension continuously changes, the film can occasionally be torn by the sharp corners of a load. There is another problem that the film can break to inside the corners of the most loaded lower layers of the loads packed in cardboard and corrugated paper boxes.
It is a widespread solution to sense the tension of the film by leading the film around a swing axle loaded with a spring. Using this solution, when the tension of the film between the load and the pre-stretching unit increases, it forces to deviate the swingarm loaded with spring and there are digital sensors (usually inductive ones) arranged along the circular arc described by the shaft, and the sensors transmit signals of discrete values about the tension of the film to the control system, which responds to them by changing the braking force of the film.
According to another solution the swingarm deviating along a circular arc under influence of the tension of the film is pulled or pushed by one or more springs with quasi constant force - between the two end positions of the deviation - to the direction corresponding to the smaller tension of the film. The problem with this solution is that the pulling or pushing force of the springs is not linear along the length of pulling or pushing, consequently a pre-stretching unit with springs has also not linear but progressive behavior.
A possible consequence of this operation is that a machine combined with digital control is amenable to oscillation and sets tension of the film in wide range. Consequently an excessive tension can arise, which can result in tearing or loosening. It can even cause the winding up of the film onto the rubber covered cylinders, and force to stop the packing process. The pre-stretching of film with loading by spring has also another problem, that it cannot be adjusted, repeated and measured.
We set ourselves an aim to develop an improved machine eliminating the above mentioned disadvantages.
We reached this aim in such a way that we completed the machine with a tiltable film tension setting unit, which has pre-stretching rollers provided with a pre-stretching motor connected to the frame of a film carrying and pre-stretching unit, a leading roller containing an arm provided with a roller, a tension setting pneumatic cylinder, which has a piston provided with magnet, with an analogous transducer of displacement, a pressure regulator and a frequency changer.
The invention relates to an machine for stretch wrapping vertical and top surface of loads with stretchable film having a base frame, a turntable mounted in it and a mast fastened on the base frame.
A carriage vertically moving the film is mounted on the mentioned mast and bushing is supporting the carriage.
A shaft is inserted into the bushing and a reel of film is connected to the one end and the tilting actuator is connected to the other end of the shaft.
A sensor for the vertical (basic) position and a sensor for the horizontal position are mounted on the base frame, triggering flags mounted on the turntable associated to the corners of the load, as operating elements controlling the tilting. The characteristics of the machine are that it has a swinging film tension setting unit connected to the other end of the pin, which has pre-stretching rollers provided with a pre-stretching motor and fastened to the frame of the film carrying and pre-stretching unit, a leading roller containing an arm provided with a roller, a tension setting pneumatic cylinder having a piston with magnet and an analogous displacement transducer, furthermore a pressure regulator and a frequency changer, where the film winded off from the film reel is led between pre-stretching rollers connected one to another with a transmission and one of them is driven by a pre-stretching motor, then the film is led around a leading roller having an arm moving around a centre of rotation and provided with a roller, this arm is connected to the piston provided with magnet and arranged in the film tension setting pneumatic working cylinder, the latter is provided with an analogous displacement transducer, the piston provided with magnet is connected to the pressure regulator and the frequency changer and the frequency changer is connected also to the pre-stretching motor.
The turntable of the machine is driven with a turntable driving motor.
The piston provided with magnet of the machine is moved between two end positions in relation to the set reference value through the pressure regulator.
The machine according to the invention is shown in the Figures 1 and 2.
The Figure 1 shows the schematic representation of the machine, while the Figure 2 shows the regulating elements of the machine and their connections.
The Figure 1 shows an advantageous embodiment of the machine. The solution covers among others also those machines having more than two pre-stretching rollers and their drive can be either identical to the one shown or different from it.
The base frame 1, the turntable 2 mounted in it and the load 13 is positioned on the turntable 2 are shown in the Figure 1.
The carriage 4 vertically moving the film reel 7 is fastened to the mast 3 mounted on the base frame 1 and bushing 5 are formed on the carriage 4.
A shaft 6 is inserted into bushing 5, a tilting actuator 8 is connected to the one end and a film tension setting unit 22 is connected to the other end of it.
The home position sensor 9 and the horizontal position sensor 10 are arranged on the base frame 1, and (tilting controlling) triggering flags 12 A, 12B, 12C, 12D are controlling the tilting associated to the corners of the load 14, as well as a home position sensor 9 are mounted on the turntable 2.
The swinging film tension setting unit 22 fastened to the frame of the film holding and pre-stretching unit 23 has pre-stretching rollers 7A provided with a pre-stretching motor 20, a leading roller 7B containing an arm provided with a roller 7C, a tension setting pneumatic cylinder 16 having an analogous displacement transducer 17 and supplied with a piston provided with magnet 16 A, a pressure regulator 18 and a frequency changer The film winded off from the film reel 7 is led between the pre-stretching rollers 7A connected one to another with a transmission 19 and one of them is driven with the pre- stretching motor 20, then the film is led around a leading roller 7B having an arm moving around a centre of rotation and the arm is provided with a roller 7C.
The arm provided with the roller 7C is connected to a piston provided with magnet 16A and the piston provided with magnet 16A is arranged in a tension setting pneumatic cylinder 16 provided with an analogous displacement transducer 17.
The piston provided with magnet 16A is connected to a pressure regulator 18 and a frequency changer 15. The frequency changer 15 is connected also to the pre-stretching motor 20 of the pre-stretching rollers 7A.
The turntable 2 is driven with a turntable driving motor 21.
The piston provided with magnet 16A is moved by a pressure regulator 18 between two end positions in relation to the set reference value.
We applied advantageously the product SM6 of the company Bosch Rexroth or the one named SMAT of the company Festo as analogous displacement transducer 17.
The transmission 19 can be of any usual type, advantageously one with chain, V-belt, gears, timing belt etc.
The Figure 2 shows the tension setting pneumatic cylinder 16 having the piston provided with magnet 16A and the analogous displacement transducer 17 connected to the pressure regulator 18.
The machine contains a tension setting pneumatic cylinder 16 equipped with a piston provided with magnet 16 A, charged on one side and a pressure regulator 18 connected to it, applicable for setting the tension of the film in relation to an targeted reference value. The tension setting pneumatic cylinder 16 is provided with an analogous displacement transducer 17 measuring the position of the piston provided with magnet 16A. The transducer transforms the position to an electric signal characterizing it and regulates with that the film pre-stretching motor 20 through a frequency changer 15. In the case where the tensile force characterizing the tension of the film is less than the original reference value set by the tension setting pneumatic cylinder 16 and the pressure regulator 18 belonging to it, the piston provided with magnet 16A moves towards the one end position.
The rotary speed of the pre-stretching motor 20 is then diminished; it wraps the load 13 with less film during a unit of time until that film quantity during the unit of time becomes equal to or less than the quantity sufficient to wrap the load 13. The load 13 "pulls" the film because of that, it becomes stretched and the force characterizing its tension moves the arm provided with roller 7C towards the position characterizing the tersioned film. The piston provided with magnet 16A of the tension setting pneumatic cylinder 16 will be moved towards the other end position at the same time. Consequently, the analogous displacement transducer 17 sends accelerating signal to the frequency changer 15, which sends accelerating signal to the pre-stretching motor 20.
The current position of the piston provided with magnet 16A is regulated by the resultant of the pressure set and the pulling force arising on the film. The pulling or pushing force of the tension setting pneumatic cylinder 16 can be set in the whole length of path, the pressure can be measured, so the stretching force can be repeated.
The horizontal axis of the film tension setting unit 22 encloses an angle of twentyfive degrees with the radial direction of the main rotating movement, so the upper edge of the film turned to horizontal on the side of the real or imaginary centre of the main rotating movement is not elongated in such a great extent that it could lose the ability of shrinking back.
The advantages of the machine according to the invention are as follows:
It follows the angular displacement directly proportional to the film tension between the load 13 and the pre-stretching rollers 7A with an analogous signal of a contactless displacement transducer 17, which can accept not only a small number of digital values but even several hundreds of individual values. The measurement of the tension is more accurate, the regulating action is quicker and the difference of the tensions to be compensated becomes smaller.
The pre-stretching motor responds quicker, more accurately and with smaller redundancy under the influence of the increased tension
The required value of the film tension can be better approached and kept by means of the regulating action of increased accuracy during the whole duration of the wrapping.
The swinging film tension setting unit 22, which can be operated with motor-driven pre- stretching and at several pre-sets of pressure, adjustable in analogous way can be a separate complement of the machine wrapping with stretchable film, which can be built on all types of the machines wrapping with stretchable film, e. g. to the constructions with rotating arm or rotating ring, and the wrapping with film can be solved on a machine wrapping with stretchable film of any type with a relatively small cost using the stretchable film used for wrapping the lateral surfaces of the load 13. List of symbols
1 base frame
2 turntable
3 mast
4 carriage
5 bushing
6 shaft
7 film reel
7A pre-stretching rollers
7B leading roller
7C arm provided with roller
8 tilting actuator
9 home position sensor
10 horizontal position sensor
11 home position actuating element
12A, B, C, D (tilting controlling) triggering flags
13 load
14 corners of the load
15 frequency changer
16 tension setting pneumatic cylinder
16A piston provided with magnet
17 analogous displacement transducer
18 pressure regulator
19 transmission
20 pre-stretching motor
21 turntable driving motor
22 film tension setting unit
23 frame of the film holding and pre-stretching unit

Claims

1. A machine for wrapping vertical and top surface of loads (13) with stretchable film having a base frame (1), a turntable (2) mounted in it and a mast (3) fastened to the base frame (1), a carriage (4) moving vertically a film reel (7) is fastened to the mast (3), bushings (5) are formed on the carriage (4), a shaft (6) is inserted through it, a tilting actuator (8) is connected to the one end and a film reel (7) is connected to the other end of the shaft (6) and a home position sensor (9) and a horizontal position sensor (10) are arranged on the base frame (1), tilting controlling triggering flags (12A, 12B, 12C, 12D) associated to the corners (14) of the load (13) and a home position actuating element (11) are fastened to the turntable (2) c h a r a c t e r i z e d b y t h a t it is provided with a swinging film tension setting unit (22) connected to the other end of the shaft (6), which unit has pre-stretching rollers (7 A) provided with a pre-stretching motor (20), a leading roller (7B) containing an arm provided with a roller (7C), a tension setting pneumatic cylinder (16) provided with an analogous displacement transducer (17) and equipped with a piston provided with magnet (16A), furthermore a pressure regulator (18) and a frequency changer (15) all fastened to the frame of the film holding and pre-stretching unit (23), wherein the film winded off from the film reel (7) is led between pre-stretching rollers (7 A) one connected to another with a transmission (19) and one of them is driven by a pre-stretching motor (20) then the film is led around a leading roller (7B) having an arm rotating around a center of rotation and the arm is provided with a roller (7C), it is connected to the piston provided with magnet (16 A), which is mounted in a tension setting pneumatic cylinder (16), the latter is provided with an analogous displacement transducer (17) and the piston provided with magnet (16A) is connected to the pressure regulator (18) and the frequency changer (15), which frequency changer (15) is connected also to the pre-stretching motor (20).
2. The machine according to the claim l c h a r a c t e r i z e d b y t h a t the turntable (2) is driven by a turntable driving motor (21).
3. The machine according to the claim 1 characterized by that the piston provided with magnet (16A) is moved in relation to a set reference value between two end positions by the pressure regulator (18).
EP14789860.5A 2013-09-12 2014-09-02 Machine for stretch wrapping loads with stretchable film Active EP3049331B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU1300528A HU230529B1 (en) 2013-09-12 2013-09-12 Device for covering unit-loads with stretch foil
PCT/HU2014/000079 WO2015036807A1 (en) 2013-09-12 2014-09-02 Machine for stretch wrapping loads with stretchable film

Publications (2)

Publication Number Publication Date
EP3049331A1 true EP3049331A1 (en) 2016-08-03
EP3049331B1 EP3049331B1 (en) 2018-08-22

Family

ID=89991248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14789860.5A Active EP3049331B1 (en) 2013-09-12 2014-09-02 Machine for stretch wrapping loads with stretchable film

Country Status (4)

Country Link
EP (1) EP3049331B1 (en)
ES (1) ES2691958T3 (en)
HU (1) HU230529B1 (en)
WO (1) WO2015036807A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201700082727A1 (en) 2017-07-20 2019-01-20 Aetna Group Spa METHOD AND MACHINE TO WRAP A LOAD WITH A FILM
CN108387349B (en) * 2018-05-28 2023-11-24 杭州国辰机器人科技有限公司 General gas leakage detecting system of food industry cover mark membrane
CN113381160B (en) * 2021-06-18 2022-07-01 上海航天测控通信研究所 Film antenna tensile force active adjusting mechanism

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458467A (en) * 1981-03-31 1984-07-10 Infra Pak (Dallas), Inc. Pretensioner for stretchable film web with dancer roller compensation
US4706443A (en) * 1982-05-04 1987-11-17 International Packaging Machines, Inc. Constant tension stretch wrapping machine
DE3633680A1 (en) 1986-10-03 1988-04-14 Dentz Verpackungsmaschinen Gmb DEVICE FOR SHRINKING PACKAGING FILMS
DE3941940C1 (en) * 1989-12-19 1991-03-21 B. Hagemann Gmbh & Co, 4430 Steinfurt, De
US6370839B1 (en) * 1999-08-10 2002-04-16 Sekisui Jushi Kabushiki Kaisha Stretch wrapping machine
US6185914B1 (en) * 1999-09-10 2001-02-13 1137508 Ontario Ltd. Pre-stretch web dispenser
IT1319650B1 (en) * 2000-11-14 2003-10-23 Sestese Off Mec UNWINDING REEL EQUIPPED WITH DRIVING DEACTIVATION VEHICLES.
GB0812903D0 (en) * 2008-07-15 2008-08-20 Rota Eng Ltd Linear actuator and position sensing apparatus therefor
DE102010034994B4 (en) * 2010-08-20 2012-06-06 Festo Ag & Co. Kg Measuring device and method for detecting and processing a position of a measuring element

Also Published As

Publication number Publication date
HUP1300528A2 (en) 2015-03-30
ES2691958T3 (en) 2018-11-29
EP3049331B1 (en) 2018-08-22
WO2015036807A1 (en) 2015-03-19
HU230529B1 (en) 2016-11-28

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