EP3033286A1

EP3033286A1 - Dispenser

Info

Publication number: EP3033286A1
Application number: EP14744056.4A
Authority: EP
Inventors: Peter Himmelsbach; Hans-Peter BRANDT
Original assignee: Tesa SE
Current assignee: Tesa SE
Priority date: 2013-08-15
Filing date: 2014-07-23
Publication date: 2016-06-22
Also published as: CN105517927A; BR112016002374A2; RU2016108979A3; US20160251191A1; KR20160045764A; RU2658986C2; US10144610B2; CN105517927B; RU2016108979A; JP2016532614A; WO2015022155A1

Abstract

Dispenser for dispensing a material (42) that is adhesive on at least one side, in which at least one adhesive side of the material is covered with a liner (41) that has at least one slit (45) extending in a longitudinal direction, wherein the material located on the liner is wound up to form a roll in the form of an Archimedean spiral and at least one slit is located beneath the material covered with the liner, consisting of a frame at one end of which there is a receptacle for the material roll such that the material roll is mounted in a rotatable manner, a first guide device by way of which the material, together with the liner, is guided to a first dispensing edge (2) at which at least one first strip of the liner (41a) is pulled off in that the liner is cut open at the slit located beneath the material, while the material is guided with the remaining second liner strip (41b) to a second dispensing edge (3), a second guide device by way of which the material, together with the remaining liner strip (41b), is guided to a second dispensing edge (3) at which the remaining cutting (42) of the liner can be pulled off.

Description

description

dispensers

The present invention relates to a dispenser for dispensing of a material which is at least adhesively finished on one side and in which at least one adhesive side of the material is covered with a liner.

Adhesive tapes, which are coated with adhesives on one or both sides, are usually wound onto a core (made of plastic or cardboard) in the form of an Archimedean spiral at the end of the production process. In order to prevent the pressure-sensitive adhesive from sticking to the support in the case of double-sided adhesive tapes or single-sided adhesive tapes, the adhesive tapes are covered with an antiadhesive covering material (also referred to as separating material) before winding, which is wound up together with the adhesive tape. The person skilled in such cover materials under the name Releaseliner or Liner are known.

A liner (release paper, release film) is not part of an adhesive tape, but only an aid for its production, storage or for further processing by punching. In addition, unlike an adhesive tape carrier, a liner is at least partially not firmly bonded to an adhesive layer.

Before using the adhesive tape, the liner is usually removed.

Self-adhesive labels, also known as blanks, are produced in roll form by coating on the label material an adhesive which is then covered with a liner. In an alternative method, the covering material can also be coated and then the support material can be laminated to it. Suitable process steps are used to create an application-related network. The label material is rolled up into large rolls (so-called parent rolls). The parent rolls are then unrolled and stamped the labels from the label material, that is, the top layers of composite material from the adhesive label material and the liner are cut according to the later Eti chain contour with or without grid. Of course, a direct separation without intermediate rolling is possible.

In the following step, if necessary, the so-called grid is removed and wound up. This is the excess material around the labels.

In the final step, the stamped labels, often several strips next to each other, are rewound into large rolls.

Usually, the mother roll, from which the blanks are punched, a large width, so that in the transverse direction a plurality of blanks are arranged side by side. For further processing, therefore, the mother roll is cut longitudinally to mostly single-lane label rolls, wherein the width of the resulting strip is adapted to the width of the blanks, so that on the resulting strip a web of successively arranged, so arranged in the longitudinal direction blanks.

If desired, two or more blanks may be arranged side by side on the resulting strip.

Finally, the webs are wound on a core (made of plastic or cardboard) with defined diameters or numbers of labels in the form of an Archimedean spiral.

Again, the cutting of the individual roles from the parent roll is possible without a meantime takes place winding.

The problem with these blank or label rolls is that the blanks are all over the liner strip.

Depending on the material from which the support and / or the adhesive of the blanks consist or from which material the liner is made, the blanks for the important dispensing process are very difficult to detach from the liner. The blanks firmly adhere to the liner.

Adhesive tapes of this type are frequently used in industrial production. This can be used for fastening or sealing. In some cases, they can have a dampening effect. A particularly preferred field of application can be found in the Automotive industry. Here, for example, cable lines are attached with an adhesive tape.

A big problem always arises with the negotiability of the blanks. Usually, the liner closes flush with the blanks, that is, there is no piece of a blank over which the blank can be gripped and conveniently pulled off. On the contrary, the fact that liners and blanks are congruent, it is often very difficult and therefore very time-consuming to replace the blank at least one point of the liner strip.

This is no longer tolerated today at the current production speeds.

The supplier of such blanks is expected to provide a solution so that the blanks on the liner can be easily and quickly removed from the liner.

This is problematic in the case when the carrier material has a low flexural rigidity and the release force from the liner - by the choice of adhesive and / or application amount - is high. In these cases, commercial dispensers can not work reliably because the blank beats around the intended dispensing edge and does not detach from the liner. It comes here then to disturbances.

The object of the invention is to provide a dispenser available, which allows the structural design that in particular one-sided adhesive tape sections or stampings that are located on a liner, can be easily and quickly donated to any surface, and the one easy removal of the adhesive tape or blank allows.

This object is achieved by a dispenser, as set forth in the main claim. Further developments of the device according to the invention are the subject of the dependent claims. Accordingly, the invention describes a dispenser for dispensing an at least single-sided adhesive material in which at least one adhesive side of the material is covered with a liner having at least one longitudinal slot, the material on the liner becoming a roll in shape an Archimedean spiral is wound and there is at least one slot below the material covered with the liner.

The dispenser consists of a frame, at one end of a receptacle for the roll of material is present, so that the roll of material is rotatably mounted, a first guide means, with which the material together with liner is guided to a first dispensing edge, at least a first, In particular smaller strip of the liner is withdrawn by the liner is separated at the slot located below the material, while the material with the remaining second, in particular larger liner strip is passed through a further second guide means to a second dispensing edge. At this point, the blank is partially uncovered by the liner and can therefore be easily removed (preferably laterally). Preferably, the remaining strip of the liner is wound over another device.

The material is preferably an adhesive tape which adheres at least on one side or a series of blanks arranged one behind the other and adhering at least on one side.

The individual blanks (adhesive tape sections) are preferably arranged in the form of rectangles on the liner. Furthermore, it is very advantageous if these rectangles are arranged on the liner without spacing. In the following, preferred embodiments of the unwinder are explained on the basis of a material which consists of a series of blanks arranged one behind the other, at least one-sidedly adhering blanks, without this being understood to mean any restriction. By removing the one liner strip at the first dispensing edge, a portion of each blank is uncovered, that is freed from the liner, so that this section of each can serve as a very good gripping handle.

By using a slotted liner, it is possible that in the dispenser according to the invention, the material to be dispensed with the liner freed Handles available. Because of the unwinding design, due to the positive guidance with partial covering of the liner, very soft and strongly adhesive blanks can be donated. It is preferred to dispense blanks having a peel force of less than 100 cN / cm, more preferably a peel force of 2 cN / cm to 50 cN / cm, and most preferably a peel force of 4 cN / cm to 21 cN / cm.

To determine the peel force, the samples are conditioned for 24 hours at 23 ° C and 50% relative humidity. Then the blank of the adhesive tape covered with a release paper is cut into 20 mm wide strips. The blank is glued to a test plate with the aid of a double-sided adhesive tape, so that the carrier of the blank is fixed with the double-sided adhesive tape. The test plate is fixed in a clamping device of a tensile tester and the release paper is peeled off at 180 ° angle, the force required for this is taken over a load cell. The peeling off of the release paper is carried out at a speed of 300 mm / min.

Further preferably, blanks having a bending stiffness of less than 0.5 mNm, more preferably blanks having a bending stiffness of less than 0.25 mNm and very particularly preferably having a bending stiffness of less than 0.05 mNm, are dispensed.

To determine the bending stiffness in accordance with DIN 53864, a 38 mm wide strip of the sample to be examined is clamped between two clamping jaws in the measuring device (device of Lorentzen & Wettre). The sample is rotated at a constant speed against a force sensor, the force being respectively recorded as a function of the bending angle. The values of bending stiffness are determined at a bending angle of 15 °. Preferably, the liner has only one slot.

Further preferably, the width ratio of the two resulting liner strips is between 10:90 and 30:70, more preferably between 20:80 and 30:70, more preferably exactly 20:80, and more preferably the first liner strip is the narrower one. According to a preferred embodiment, the slot only completely cuts through the liner, that is, the remaining blank is not slit at this point. The slot (or, if there are several, the slots) may be designed as a continuous or broken line, the latter preferably interrupted at regular intervals.

In a further embodiment of the invention, a portion of the slotted liner is removed already in the production process and added a new liner. It is possible that the newly supplied liner has a different width than the discharged liner. Advantageously, the width of the newly fed liner is greater than the width of the discharged liner. Furthermore, the slitting of the liner can take place in the device according to the invention.

The slitting of the liner can be accomplished by any standard cutting, slitting or punching technique that provides the precision needed for scoring and is suitable for use at such close proximity.

Preferably, this is the method of rotary punching with suitable tools.

According to a preferred embodiment of the invention, the first liner strip is first pulled off by means of a preferably electrically or pneumatically driven roller over the dispensing edge, then removed and possibly wound up on preferably the same or another roll.

Further preferably, the receptacle for the roll of material is braked, so that an uncontrolled running of the roll of material, for example, when a stop of the liner feed is prevented.

Furthermore, at least one adjustable brake, in particular a friction brake, ensures a uniform, not too low tension in the liner-covered material web during the dispensing process. The preferred existing brake in the material roll unwinding provides the necessary bias of the liner strip at the point where the blank can be removed. According to a further preferred embodiment of the invention, the second liner strip is conveyed by means of a preferably electrically or pneumatically driven roller to a removal plate. There, the tape blanks are removed, the remaining liner removed and optionally also wound on a roll. It is advantageous if the winding of both liners are translated differently, wherein a liner is wound up a little faster and is synchronized by the slip with the main drive of the other liner. This ensures a smooth running.

If the liner is slit several times and is peeled off in multiple strips, it is advantageous if each individual strip is pulled off and wound up with the aid of a preferably electrically or pneumatically driven roller.

In particular, if the blanks are arranged in multiple lanes on the liner (ie two or more blanks lying next to one another in the transverse direction), it is advantageous that at least one slot is provided under each web of the blanks.

Further preferably, the dispenser in the region of the second dispensing edge or removal plate on a sensor with which is recognized that a stamped part or the end of the adhesive tape has reached near the dispensing edge.

For this case, for example, the advances of the liner rolls are stopped.

Two or more sensors can also be used. The sensors can transmit electromechanical (for example as a rocker switch), electro-optically or by sound sensor signals to the device.

After removal of a blank, the material is transported further, for example, by pulling on both liners on the drive side (electrically or pneumatically operated liner winding).

Particularly advantageous is the dispenser in a material consisting of a series of successively arranged, one-sided adhesive blanks, which on a liner are arranged, which has a slot, with a width ratio of the two resulting liner strips of 20:80.

In an advantageous embodiment, the adhesive tape blanks 10 to 250 mm wide and have a length of 10 mm to 250 mm. Particularly preferred are adhesive tape blanks having a width of 30 mm to 200 mm and a length of 10 to 100 mm. Very particular preference is given to adhesive tape blanks having a width of 30 to 120 mm and a length of 30 to 100 mm. The narrower liner strips separated by the slot are in an advantageous embodiment at least 2 mm, more preferably 2 to 50 mm, most preferably 10 to 30 mm.

For the purposes of this invention, the general term "adhesive tape" encompasses all self-adhesive sheetlike structures, such as films or film sections expanded in two dimensions, tapes of extended length and limited width, tape sections, etc. Blanks or labels are also to be subsumed under an adhesive tape in the broadest sense ,

The adhesive tape can be provided in fixed lengths, such as by the meter, or as endless wraps on rolls (Archimedean spiral) or spools. If blanks are used, they can have different geometric shapes. By way of example - but without limiting the invention - quasi four- or hexagonal or circular or oval-shaped sheet called.

As a carrier for the adhesive tape and / or for the liner preferably paper, a paper-polyolefin composite and / or a film are used.

As a carrier and as a liner, in principle, films such as BOPP or MOPP, PET, PVC or nonwovens (based on cellulose or polymers) are suitable, in particular PUR. Also come foams (for example, PUR, PE, PE / EVA, EPDM, PP, PE, silicone, etc.).

Examples of usable film materials are PP, PE, PET, PA, PU, PVC or polyester. In general, polyolefins, copolymers of ethylene and polar monomers such as styrene, vinyl acetate, methyl methacrylate, butyl acrylate or acrylic acid, homopolymers such as HDPE, LDPE, MDPE or copolymers of ethylene and a other olefins such as propene, butene, hexene or octene (for example, LLDPE, VLLDE) or polypropylenes such as polypropylene homopolymers, polypropylene random copolymers or polypropylene block copolymers) and mixtures of all the aforementioned polymers can be used.

To be able to achieve the antiadhesive effect as a liner, the liners can be equipped on one or both sides with an anti-adhesive coating.

As an anti-adhesive coating, a solvent-free coated silicone is preferably used.

Further preferably, the anti-adhesive coating and / or the solvent-free coated silicone at 0.8 to 3.7 g / m ² , preferably 1, 3 to 3.2 g / m ² , most preferably 1, 8 to 2.8 g / m ² , applied. But also solvent-containing systems as anti-adhesive coating are possible, with an application amount of in particular 0.3 to 1 g / m ² .

In addition, as antiadhesive layers, for example, silicone, paraffin, Teflon or waxes can be used. Then, silicone-free release layers, for example "non-silicone" from Rexam, or low-silicone release layers, for example "Lo ex" from Rexam, can be used.

The thickness of the liner is preferably in a range from 20 to 120 μm, preferably from 30 to 100 μm, particularly preferably from 50 to 80 μm. More preferably, it is in the range of 45 to 55 or 60 to 80 μηη.

Adhesive compositions for the adhesive tapes can be any of the PSAs mentioned, for example, in SAT AS, Handbook of Pressure Sensitive Adhesive Technology, Third Edition. In particular, natural / synthetic rubber and acrylate-based adhesives which can be applied from the melt or solution are suitable. With reference to the figures described below, particularly advantageous embodiments of the device are explained in more detail, without wishing to unnecessarily limit the invention. Show it

Figure 1 shows a part of the unwinder and

FIG. 2 shows a roll of the carrier material web with adhesive tape sections.

In FIG. 1, a part of the unwinder for dispensing is shown by a material 42 which adheres at least on one side and in which at least one adhesive side of the material is covered with a liner 41 which has at least one longitudinal slot 45.

From a receiving roller, not shown for the equipped with blanks 42 liner 41 of the liner 41 is guided in the direction of a first dispensing edge 2.

At this dispensing edge 2, the liner 41 is separated at the slot 45 located below the blanks 42, so that a first strip of the liner 41 a is pulled off, which is subsequently rolled up.

The blanks 42 with the remaining second liner strip 41 b are guided to a second dispensing edge 3, at which the remaining second strip of the liner 41 b is withdrawn laterally.

The dispenser has, in the region of the second dispensing edge 3, a sensor 4 with which it is detected that a blank 42 has arrived in the vicinity of the dispensing edge 3 and thus in the dispensing area 5.

The liner 41 is wound according to Figure 2 into a roll in the form of an Archimedean spiral. On the liner 41, the individual blanks 42, here in the form of circles, are arranged at regular intervals. The liner 41 has different anti-adhesive coatings 43, 44. The antiadhesive coating 43 located on the lower side of the liner 41 has a higher degree of repellency than the antiadhesive coating 44 located on the upper side of the liner 1.

Finally, the liner 41 has a slot 45, which is arranged centrally, so that the slot 45 is located below the blanks 42.

Claims

claims

1 . A dispenser for dispensing an at least single-sided adhesive material, wherein at least one adhesive side of the material is covered with a liner having at least one longitudinal slot, the material on the liner being wound into a roll in the form of an Archimedean spiral and at least one slot is located below the material covered with the liner

from a frame, at one end of which a receptacle for the roll of material is present, so that the roll of material is rotatably mounted,

a first guide device, with which the material together with liner is guided to a first dispensing edge at which at least a first strip of the liner is removed by the liner is separated at the slot located below the material while the material with the remaining second liner strip to a second donation edge is led,

a second guide means, with which the material is carried along with remaining liner strips to a second dispensing edge, at which the remaining second strip of the liner can be removed.

2. Dispenser according to claim 1,

characterized in that

the material is a series of successively arranged, at least one-sided adhesive blanks.

3. Dispenser according to claim 1 or 2,

characterized in that

the liner has only one slot.

4. Dispenser according to at least one of claims 1 to 3,

characterized in that

the width ratio of the two resulting liner strips is between 10:90 and 30:70, preferably between 20:80 and 30:70, more preferably exactly 20:80, and more preferably the first liner strip is the narrower one.

5. Dispenser according to at least one of the preceding claims,

characterized in that

the first liner strip is first pulled off by means of a preferably electrically or pneumatically driven roller over the dispensing edge and then wound up on the roll.

6. Dispenser according to at least one of the preceding claims,

characterized in that

the recording for the roll of material is braked.

7. Dispenser according to at least one of the preceding claims,

characterized in that

the second liner strip is first pulled off via the dispensing edge with the aid of a preferably electrically or pneumatically driven roller.

8. Dispenser according to at least one of the preceding claims,

characterized in that

the material is transported further, for example by pulling the drive side on both liners.

9. Dispenser according to at least one of the preceding claims,

characterized in that

the material has a width of 10 to 300 mm and a length of 10 to 320 mm, wherein the liner has a slot of 2 to 40 mm.

10. Dispenser according to at least one of the preceding claims,

characterized in that

the material has a peel force of 2 to 50 cN / cm and a flexural strength of less than 0.5 mNm.

1 1. Use of a unwinder according to at least one of the preceding claims, characterized in that the adhesive material is used in the manufacture of industrial components, especially components of the automotive industry, cable fastening.