EP1036002B1 - Method and device for producing a package unit, especially for protective gloves - Google Patents

Description

The present invention relates to a method and a Device for producing a packaging unit from Multi-layer film, attached on one side to a carrier, each with an almost identical outline, plastic articles arranged one above the other, in particular of protective gloves arranged one above the other, with a feed one web of the carrier and several webs of the film Transport devices and welding in at least two one behind the other in the direction of movement of the web of the carrier arranged welding stations takes place.

A packaging unit of the type described is for example known from EP 0 722 409 B1, which is a packaging unit with two protective gloves arranged on a carrier sheet and describes a process for their preparation. In this packaging unit, the two protective gloves, especially AIDS gloves, one on each side Carrier sheet and / or on an opposite side of the Carrier sheet attached that the outline of the two Overlap protective gloves at least partially. At a Stacking of protective gloves on one side of the Carrier sheet is preferably the outline of the further from Carrier sheet removed protective glove of the same shape however, slightly larger than that of the support sheet Protective glove. In this way, when manufacturing the protective gloves with a heat seal seam first the Protective glove made of two layers of film sealed and thus attached to the carrier, whereupon then the second protective glove in the same way the first protective glove is sealed. The fact that the protective glove a little further away from the carrier sheet has a larger outline contour, this protective glove the heat seal can be done without this protective glove glued to the protective glove underneath. Instead of the heat seal, EP 0722 409 B1 can also gluing may be provided at some adhesive points. Like in Detail and by what means the heat seal or the Gluing can be done is not in EP 0722 409 B1 disclosed.

A method and a device is known from US Pat. No. 3,923,577 known for the manufacture of a multi-component article, at which are particularly common packaging of Gloves and a hood made of plastic film. The Packaging can be removed from a dispenser and used for The hair treatment determines where the glove is the hand protects and the hood the hair during exposure of a hair dye covered. The article described consists of a support layer in the form of a sheet, e.g. made of paper, Fabric or similar on which several heat-welded products, such as the removable from a dispenser, made of plastic Gloves, shoe guards, bags, hoods, etc. arranged could be. The device comprises as transport devices a drum and pull rollers for simultaneous feeding and for Transport of several heat-weldable plastic sheets and one Paper layer and two arranged on the circumference of the drum Welding press forms for successive shaping or Welding the layers of the articles on the paper back wall are secured. There are also various idlers intended to keep the webs taut. The at least two Packaging containing items is formed as follows: Feeding a flexible carrier layer, laying on a number layers of a first material on the carrier layer, For example, formation of a glove from the first Material, such that the glove later from the Carrier layer can be removed, laying on a number of Lay a second material over the glove, forming for example a hood made of the second material, in such a way that the hood is removed from the backing later removed and used regardless of the glove can. By arranging the welding presses on the circumference of the Drum can experience processing problems with this setup when welding the film layers of the articles result, especially if these, like a glove, are in the plane is not a straight and / or irregular contour have, since the film layers in the area of the welding stations in a curved path over the outer surface of the drum run.

A protective glove is described in DE 39 20 597 C1, by welding using four superimposed ones Plastic film layers double-walled is, the two inner film layers under shaping Separation welding in a first welding station to one Inner glove and the two outer layers of film around the Inner glove around with forming separation welding in a second, the first downstream welding station are welded to an outer glove. The transport of the Plastic film layers and possibly a carrier web takes place on a conveyor belt.

A method and a device is known from US Pat. No. 3,028,576 for the production of a packaging unit of made from foil multilayer, fixed on one side on a carrier, protective gloves with the same outline known, wherein a feed of a web of a carrier and two sheets of film over transport devices and one Welding takes place in a welding station. The as feed rollers trained transport facilities, of which one in the direction of movement of the webs in front of the welding station is preferably driven intermittently. The individual protective gloves do not overlap, but rather are arranged side by side.

The invention has for its object an improved method and an improved device as described in the opening paragraph Provide species that are particularly suitable for a plastic article with almost the same outline, for example a pair of gloves, one on top of the other to be arranged, overcoming the disadvantages described above should be.

According to the method according to the invention, this becomes achieved the position of one in a first welding station manufactured plastic article in the subsequent welding station on the feed of the trained as feed rollers Transport devices is controlled. The feed rollers are controlled by a constant step size in common mode Servomotors driven, with one of the feed rollers, in the direction of movement of the webs in front of the first welding station is arranged, the path of the carrier and at least two of the film webs are guided and over one of the feed rollers, in the direction of movement of the webs behind the last welding station is arranged, the path of the carrier with the packaging unit of the multilayer made of foil superimposed plastic article attached to the carrier to be led. The distance between the welding stations is an integer multiple of each Equidistant step size of the servo motors.

According to the invention, an exact and Safe positioning of the articles in the packaging unit achieved, especially when this, like a glove, an irregular and / or curved one in the plane Have a contour. Because the step size of the two Servo motors is equidistant, i.e. the step size of the first Servo motor is the same size as that of the second servo motor, are the webs of the carrier and the film during their taut and smooth all the way through the welding stations held. Due to the distance defined according to the invention This ensures that welding stations always ensure that if there is a plastic article in the first welding station is manufactured, including one manufactured in the first welding station Item is positioned exactly in the second welding station. In the second welding station, for example, a second, to be placed above a first, further from the Protective glove removed from the carrier web with a possibly intended overlap manufactured and exactly to a predetermined Place on the carrier.

The invention that can be used to implement this method Device is a device of the beginning described type, in which the transport devices as feed rollers are executed with a constant step size servomotors controlled in common mode are driven, one of the feed rollers in the direction of movement of the webs in front of the first welding station and one of the feed rollers is arranged behind the second welding station and the distance of the welding stations from each other an integer multiple the equidistant step size of the servo motors is.

In this device according to the invention can be used as welding stations with advantage using the heat pulse welding process working welding presses with a substantially flat Work surface.

In addition, according to the invention - relative to the carrier - one precise and safe positioning of the articles in the packaging unit can be achieved, which is particularly the case Significance is when usage instructions are printed on the carrier are or the carrier has a transverse perforation that must never be covered by a plastic article. This positioning can be done with the help of a direction of movement the path of the carrier arranged in front of the first welding station Sensor, in particular a photocell, can be achieved, wherein the sensor is connected to the first servo motor, and wherein on the path of the carrier at an even distance, the one integer multiple of the equidistant increment of the servomotors is markings detectable by the sensor, in particular color marks are applied. The distance the sensor from the first welding station must also an integer multiple of the equidistant step size of the servo motors. The working position of the train of the carrier in the first welding device can thus Sensor controlled, the sensor being on the path of the Carrier applied markings detected and according to the Markings determines the duty cycle of the first servo motor. Due to the distance of the sensor from the first welding stations ensure that whenever the sensor detects a marking, the Carrier in the first welding station in a working position is in which a manufactured plastic article on it can be arranged and attached.

Further advantageous design features of the invention are contained in the subclaims and the following description.

Using a preferred shown in the drawing The invention is intended to illustrate the exemplary embodiment below are explained. 1 shows a diagram of a Device according to the invention for producing a packaging unit of multilayer, one-sided made of foil attached to a carrier, almost the same in each case Outline plastic articles, especially one above the other arranged protective gloves.

1 shows a device according to the invention several unwinding stations 1, 2, 3, 4, 5 for a web 6 of Carrier and for several tracks 7, 8, 9, 10 of the film. In the Unwinding stations 1, 2, 3, 4, 5 are the web 6 of the carrier and the webs 7, 8, 9, 10 of the film as rolls 11, 12, 13, 14, 15 stored. For the production of a multilayer packaging unit, those made of foil attached to the carrier Plastic articles, for example two arranged one above the other Protective gloves, exist, are essential components the device according to the invention a first welding station 16 and a second welding station 17 are provided. ever according to the number of layers in the If necessary, the packaging unit can also have more than two Welding stations and corresponding unwinding devices for Foil sheets can be provided.

As welding stations 16, 17 can preferably after Heat pulse welding process with welding presses an essentially flat work surface. With such welding presses, special welding tasks, such as the production of molded parts, e.g. Gloves, bags, bags, protective covers, etc. with a irregular and / or curved shape of the weld seam, excellent solve, because the welding press with heating tapes of different Molds can be equipped. Almost all of them thermoplastic films, such as polyethylene, polypropylene, Polyamide, polyvinyl chloride, etc. can be easily weld. In this way, in the welding stations 16, 17 on the one hand there is a shape welding, i.e. two each the webs 7, 8 fed to the individual welding stations 16, 17 or 9, 10 of the films can be combined to form a multilayer Plastic items, e.g. into a protective glove, united on the other hand, the one made in this way Multi-layer plastic articles at the same time via a heat seal seam can also be attached to the web 6 of the carrier. In addition, a separation takes place in a manner not shown here the final shape of the plastic article from the respective tracks 7, 8 and 9, 10.

As transport devices for the web 6 of the carrier and for the webs 7, 8, 9, 10 of the film serve two feed rollers 18, 19, over two with constant step size in common mode controlled servomotors 20 schematically indicated in FIG. 1, 21 are driven. One of the feed rollers 18 is located in the direction of movement (arrow B) of the tracks 6, 7, 8, 9, 10 the first welding station 16 and the other feed roller 19 in the direction of movement B of the tracks 6, 7, 8, 9, 10 behind the second (after several welding stations behind the last) Welding station 17. The distance A between the welding stations 16, 17 from each other is an integer multiple of the step size of servomotors 20, 21. In this way, an accurate and safe positioning of the in the first welding station manufactured and connected to the web 6 of the carrier Plastic article in the downstream welding station 17 reached.

In addition, in front of the respective welding station 16, 17 to regulate the belt tension of the web 6 of the carrier and / or the webs 7, 8, 9, 10 of the film at least one system 22, 23 of resiliently suspended, partly inserted in ribbon loops Dancer rollers can be provided. Fig. 1 shows two such Dancer roller systems 22, 23 - a first system 22 in the lower Part of the device for the web 6 of the carrier and the webs 7, 8 for the production of the first multilayer plastic article and a second system 23 in the upper part of the device for which the webs 9, 10 for the production of the second multilayer Plastic article.

To smooth and increase the flexibility of the web 6 des Carrier can further, as shown in Fig. 1, in front of the direction of movement B of the web 6 of the carrier first feed roller 18 and one in front of the corresponding system 22 of the dancer rollers Carrier smoothing device 24 - if the carrier is concerned Paper, preferably a paper breaker - be arranged.

In addition, one or more of the in the unwinding station 1, 2, 3, 4, 5 rollers 11, 12, 13, 14, 15 the carrier and / or the film at least one web tension regulator 25 may be arranged. In Fig. 1 is such a Tension axis 26 for the web 6 of the carrier acting web tension regulator 25 shown.

To increase the security of the device according to the invention can be in the unwinding station 1, 2, 3, 4, 5 Rolls 11, 12, 13, 14, 15 of the carrier and / or the film also each have a device connected to a shutdown device 27 for detecting the end of the web.

To avoid the formation of air cushions in the film manufactured multi-layer plastic items, it can be useful be in the direction of movement B of the tracks 6, 7, 8, 9, 10 behind to arrange the welding stations 16, 17 grooved rollers 28, 29, through the air located between the tracks 6, 7, 8, 9, 10 can be pushed out.

In each case in the direction of movement B of the tracks 6, 7, 8, 9, 10 behind the welding stations 16, 17 are also extraction devices 30, 31 for the when the final form of the Plastic articles from the respective lanes 7, 8 or 9, 10 resulting film waste is provided.

As mentioned earlier, it may be necessary in the Packaging unit to be manufactured not only an exact and safe positioning of the articles to each other but also one make such positioning of the articles relative to the carrier. This is especially the case when on the carrier Instructions for use are printed or the carrier one Has transverse perforation. The items must then be on a whole certain point of the web 6 of the carrier can be placed. To can preferably be in the direction of movement B of the web 6 of the Carrier arranged in front of the first welding station 16 sensor 32, in particular a photocell, can be used, the Sensor 32 is connected to the first servo motor 20, and wherein detectable on the web 6 of the carrier by the sensor 32 Markings, especially color marks, are applied. The Distance C of the sensor 32 from the first welding station 16 should be an integer multiple of the equidistant Step size of the servo motors 20, 21 amount.

The markings can be of different colors, but should be as large as possible to the lane 6 of the carrier Contrast. The markings can in particular on Web edge can be attached and can be, for example, a width of 3 to 5 mm and a length of 10 to 20 mm. In particular, the use of opaque (not transparent) colors. If the entire surface of the web 6 of the carrier is printed, should be in front of the respective marking an unprinted zone of about 8 to 10 percent of the Distance of the markings from each other.

The operation of the servo motor 20 can function as a ramp take place, i.e. that after switching on first steady increase in speed, then over a certain Time a run at constant speed and then after the Shutdown signal a steady decrease in speed up to zero.

The invention is not based on the illustrated embodiment limited, but also includes all in the sense of Invention equivalent effects. In particular, it falls for example within the scope of the invention if more than two Welding stations are provided. Each of the welding stations in this case it should be the same distance from the next Have welding stations. If in the to manufacture Packing unit in one level several made of foil Plastic items should be arranged side by side, can this in a single welding station or in an additional one Welding station happen. In the latter case it is under Taking into account the extent of the articles the distance of these Welding station from the previous one by the distance the should have juxtaposed articles, too increase or decrease. Instead of a photocell Another sensor can also detect color markings, for example for the detection of inserted metal threads or the like can be used.

In addition, other facilities such as 1, behind the second feed roller 19 arranged cross cutters 33 or if necessary folding or Folding devices can be provided for the film webs.

Furthermore, the invention is not limited to that defined in claim 1 Characteristic combination limited, but can also by any any other combination of certain characteristics of all overall disclosed individual features can be defined. This means that basically every single feature of the Claim 1 omitted or by at least one other Instead of the individual feature disclosed in the application can be replaced can. In this respect, claim 1 is only a first To understand the attempt to formulate an invention.

reference numeral

1, 2, 3, 4, 5

unwinding

6

support web

7, 8, 9, 10

film webs

11, 12, 13, 14, 15

web rolls

16

first welding station

17

second welding station

18, 19

feed rollers

20, 21

servomotors

22, 23

Dancer roller systems

24

Carrier smoothing device

25

Web tension controllers

26

release axle

27

Device for web end detection

28, 29

grooved wheels

30, 31

Take-off devices for film waste

32

photocell

33

Sheeter

A

Distance between 16 and 17

B

Direction of movement of 6, 7, 8, 9, 10

Claims (16)

1. Process for the production of a pack unit comprising multilayer plastic articles that are produced from film, fixed to a substrate on one side, have a virtually identical outline and are arranged one above the other, especially protective gloves arranged one above the other, a web (6) of substrate and a plurality of webs (7, 8, 9, 10) of the film being supplied via transport devices and being welded in at least two welding stations (16, 17) arranged one behind the other in the direction of movement (B) of the web (6) of substrate, the position of a plastic article produced in a first welding station (16) being controlled in the subsequent welding station (17) via the feed of the transport devices, constructed as feed rolls (18, 19) which are driven via servomotors (20, 21) controlled synchronously with a constant step size, the web (6) of the substrate and at least two of the webs (7, 8) of the film being guided over one of the feed rolls (18), which is arranged upstream of the first welding station (16) in the direction of movement (B) of the webs (6, 7, 8, 9, 10), and the web (6) of the substrate with the pack unit of the multilayer plastic article produced from film, lying one above the other and fixed to the substrate being guided over one of the feed rolls (19), which is arranged downstream of the second welding station (17) in the direction of movement (B) of the webs (6, 7, 8, 9, 10), and the distance (A) between the welding stations (16, 17) being an integer multiple of a respective equidistant step size of the servomotors (20, 21).
2. Process according to Claim 1, characterized in that the production of the multilayer plastic article consisting of film and its fastening to the substrate are carried out by the heat-pulse welding method.
3. Process according to Claim 1 or 2, characterized in that the web tension of the web (6) of substrate and/or of the webs (7, 8, 9, 10) of the film is regulated by means of at least one system (22, 23) of dancer rolls which are spring-suspended, partly inserted into loops and in each case located upstream of the welding station (16, 17).
4. Process according to one of Claims 1 to 3, characterized in that before reaching the first feed roll (18) in the direction of movement (B) of the web (6) of substrate, the web (6) of substrate is smoothed and its flexibility increased.
5. Process according to one of Claims 1 to 4, characterized in that the tension of the web (6, 7, 8, 9, 10) of substrate and/or of the film is regulated with the aid of at least one web tension regulator (25) which is located in an unwind station (1, 2, 3, 4, 5) and acts on a tensioning shaft (26) of the respective roll (11, 12, 13, 14, 15) of the web (6, 7, 8, 9, 10).
6. Process according to one of Claims 1 to 5, characterized in that when the end of a web of a roll (11) of the substrate that is located in an unwind station (1) or a roll (12, 13, 14, 15) of the film that is located in an unwind station (2, 3, 4, 5) is reached the plant is shut down.
7. Process according to one of Claims 1 to 6, characterized in that, at least after leaving a welding station (16, 17), air between the webs (6, 7, 8, 9, 10) of substrate and the film is removed by means of grooved rolls (28, 30).
8. Process according to one of Claims 1 to 7, characterized in that the position of the web (6) of substrate in the first welding station (16) is controlled via a sensor (32), especially a photocell, arranged upstream of the first welding station (16), the sensor (32) detecting marks, especially coloured marks, applied to the web (6) of substrate, and determining the operating cycle of the first servomotor (20) in accordance with the marks.
9. Apparatus for the production of a pack unit comprising multilayer plastic articles that are produced from film, fixed to a substrate on one side, have a virtually identical outline and are arranged one above the other, especially protective gloves arranged one above the other, having transport devices for a web (6) of substrate and a plurality of webs (7, 8, 9, 10) of the film and having at least two welding stations (16, 17) arranged one behind the other in the direction of movement (B) of the web (6) of substrate, the transport devices being constructed as feed rolls (18, 19) which are driven via at least two servomotors (20, 21) controlled synchronously with a constant step size, and one of the feed rolls (18) being arranged upstream of the first welding station (16) in the direction of movement (B) of the webs (6, 7, 8, 9, 10), and one of the feed rolls (19) being arranged downstream of the second welding station (17) in the direction of movement (B) of the webs (6, 7, 8, 9, 10), and the distance (A) between the welding stations (16, 17) being an integer multiple of the step size of the servomotors (20, 21).
10. Apparatus according to Claim 9, characterized in that the welding stations (16, 17) used are welding presses that operate on the heat-pulse welding method and have a substantially flat working surface.
11. Apparatus according to Claim 9 or 10, characterized in that in order to regulate the web tension of the web (6) of substrate and/or of the webs (7, 8, 9, 10) of the film at least one system (22, 23) of spring-suspended dancer rolls is provided which are partly inserted into loops and in each case located upstream of the welding station.
12. Apparatus according to one of Claims 9 to 11, characterized in that in order to smooth the web (6) of substrate and increase its flexibility a substrate smoothing device (24), preferably a paper breaker, is arranged upstream of the first feed roll (18) in the direction of movement (B) of the web (6) of substrate.
13. Apparatus according to one of Claims 9 to 12, characterized in that at least one web tension regulator (25) is arranged on a roll (11) of the substrate in an unwind station (1) and/or on at least one roll (12, 13, 14, 15) of the film in an unwind station (2, 3, 4, 5) and acts on a tensioning shaft (26) of the respective roll (11, 12, 13, 14, 15) of the web (6, 7, 8, 9, 10).
14. Apparatus according to one of Claims 9 to 13, characterized in that at least one device (27), connected to a shutdown device and for detecting the end of a web, is arranged on a roll (11) of substrate in an unwind station (1) and/or on at least one roll (12, 13, 14, 15) of the film in an unwind station (2, 3, 4, 5).
15. Apparatus according to one of Claims 9 to 14, characterized by grooved rolls (28, 29) in each case arranged downstream of the welding station in the direction of movement (B) of the webs (6, 7, 8, 9, 10), in order to avoid the formation of air cushions in the multilayer plastic article produced from film.
16. Apparatus according to one of Claims 9 to 15, characterized by a sensor (32), especially a photocell, which is arranged upstream of the first welding station (16) in the direction of movement (B) of the web (6) of substrate, and is connected to the first servomotor (20) in order to adjust the operating cycle, marks, especially coloured marks, that can be detected by the sensor (32) being applied to the web (6) of substrate at uniform intervals, which are an integer multiple of the respectively equidistant step size of the servomotors, and the distance (C) of the sensor (32) from the first welding station (16) being an integer multiple of the respectively equidistant step size of the servomotors (20, 21).

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