DD210089A5 - METHOD AND DEVICE FOR PRODUCING PLASTIC-COATED DOCUMENTS - Google Patents

Abstract

A method and apparatus for the production of plastic coated substrates by applying a plastic by means of a patterned arranged recesses Foerderflaeche on a heated pad (2) by the gravure printing method with a device for applying the synthetic resin powder on the Foerderflaeche having a temperature at which the Flowability of the powder is still maintained, so that sticking to the Foerderflaeche is prevented, while a heated by means of heatable rollers (18,20) pressed against the Foerderflaeche and heated pad (2) is maintained at a temperature for softening and bonding of the synthetic resin powder with the base (2) leads, whereupon the so coated underlay (2) after removal from the Foerderflaeche before their Abkuehlung or possibly after Wiedererwaermung between a revolving heatable pressure roller (27) and their movement around the pressure roller (27) inhibiting leadership so hind is performed that a compacting and shrinking of the coated substrate (2) takes place.

Description

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Method and device for producing plastic-coated documents

Field of application of the invention:

The invention relates to the production of plastic-coated sheet-like documents, which are used as interlining materials in the clothing industry.

Characteristic of the known technical solutions:

Creamy bases such as textile fabrics used as interlining, e.g. used as collar inserts for shirts, are patterned with a thermoplastic resin, z.3. punctiform ,, so that then this can serve as a heat-sealable adhesive for connection to other panels. Such methods, in which the synthetic resin is applied in powder form to the substrates and fixed under heating, are described in the patents G3-PS 745 057 and US-PS 3,085,548 and FR-PS i 193 436.

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In a particularly suitable method for this purpose, the synthetic resin powder is coated by means of an applicator roll, which has a relief-like surface structure with depressions, under the action of heat so that the synthetic resin adheres firmly to the pattern. In this case, the web-shaped pad is subjected to a simultaneous high stress by train and heat, resulting in a latent elongation of this pad. Then, when re-heating occurs or the pad is subjected to a washing process, the internal stress equalizes and shrinkage of the stretched pad occurs. This is particularly disturbing when the pad in question has already been fixed as a liner by means of the applied synthetic resin to other panels by HeiSsiegeln, because in the so interconnected fabrics then occupied by the resin fabric shows a different washing and Therraoschrumpfverhalten than the most similar, but unassigned and therefore not stretched fabric. In particular, when the documents are used as interlining fabrics in shirts, this different behavior of the panels leads to wrinkles in the collar and cuffs of the shirts, which are provided with the interlining.

The well-known Sanfor process, which is carried out in order to prevent the subsequent shrinkage and running in stretched textiles and which is generally applied even before the documents with the resin before the documents, is expensive and does not lead to the already occupied with resin tissues desired goal since this shrinkage process is hampered by Sanforisieren to the coated by the resin bodies and also the resin application here shows a different behavior than the textile backing.

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Object of the invention:

The invention enables a cost-effective production of heat-sealable sheet-like documents coated with synthetic resin, which do not substantially shrink and enter at a later heating or washing process.

Explanation of the essence of the invention:

The invention has for its object to develop an improved manufacturing method of the type mentioned and the associated device.

Now, this object is achieved in that on the sheet-like pad after the Tiedruckverfahren the resin in powder form with the aid of a provided with patterned depressions conveying surface, in particular an applicator roll, z.3. Dot roller, is applied «The powder is applied to the conveying surface at a temperature at which still obtain the full flowability of the powder and sticking to the conveying surface is avoided. Here, the underlayer to be coated, which has been heated to a temperature at which the synthetic resin softens and becomes tacky, is brought into contact with the conveying surface, whereby the transfer of the synthetic resin powder from the recesses to the substrate takes place. The substrate coated with the resin is then passed through it in a heated state prior to its cooling or, if appropriate, after reheating between a rotating roller and a guide which inhibits its movement around the roller. causes a compression and shrinkage of the substrate and the plastic application occurs. Preferably, the circumferential pressure roller on the surface has a

Corrugation to prevent the roller from slipping. The restraining guide acts as a brake or drag shoe and should have a rubber or rubber pad at its interface with the pad.

This combined method of applying the synthetic resin and compacting the base achieves a precise application of the synthetic resin at a higher operating speed with a low energy consumption, whereby the pattern of the application and the application quantity can not only be precisely controlled, but at the same time it is achieved that the washing and thermal shrinkage behavior of the occupied pad is favorably influenced.

A further advantage of the method is that it is within one's hand to be able to precisely set the temperature ranges which are suitable for carrying out the method as a function of the properties of the respective synthetic resins to be processed to respectively favorable values. If necessary, in the application region of the powder to the conveying surface by cooling the conveying surface, its temperature is kept at values which are below the softening temperature or plasticizing temperature. To adjust the higher temperatures of the substrate in the transfer area, the transfer of heat by means of heated rollers through the substrate is particularly suitable; however, heat radiators are also useful for bringing the underlay in this area to the desired temperature at which plastic softens and becomes tacky. As a result, the substrate facing Tgilchen the introduced into the wells of the conveying surface plastic powder are sticky, while located in the Vertiefunaen the conveying surface

Powder particles have an iemperatur at which sticking of the plastic to the conveying surface is avoided.

Thanks to the tackiness of the substrate surface facing surface portions of the loose, applied by squeegees on the conveying surface resin powder, a precise transition of the present in the wells of the structural star of the conveying surface powder on the heated surface. Oa adhesion by _ _v plasticization of the resin powder in contact with ^v - starts the substrate thanks to its higher temperature, the position of the plastic powder in relation to the base can not change after its detachment from the conveying surface. By further heating, z.3. With heated rollers or by radiant heat, in general, a supplementary post-plasticization and sintering of the powder application is achieved, whereby the resin can be even more firmly connected to the substrate by calendering.

By the inventive leadership of the pad between a rotating roller and a movement of the Un- ~. Supporting the roll around the roller is achieved by allowing the backing to recover from the strain caused by mechanical and thermal stress before the solidification of the resin application and to relax with the effect that the washing and thermal shrinkage behavior of the base coated in this way is markedly improved.

Since the compacting and shrinking of the stretched pad by the leadership of the pad between rotating pressure roller and the inhibitory leadership and the plastic is connected to contract solid with the pad,

If necessary, the use of a separate calender roll for pressing on the plastic coating transferred from the conveying surface is therefore unnecessary on the base.

The principle of mechanical compression and shrinkage of paper and textile webs has long been known. Thus, in DE-PS 2 238 230 and DE-OS 3,002 devices are described in which the paper or textile web is guided between a Anpreßwalze and an endless elastic Ban, the peripheral speeds of the pressure roller and the elastic band are different. Also, machines made by Hunt and Moscrop (Textile Machinery) Ltd., Middleton, Manchester, UK, who work according to this principle has long been used in the textile equipment, as well as the long known Rigmel machines in which the cloth between the is guided over rollers running endless belt made of rubber and a heated pressure plate, where it is subjected to contractive forces, which cause a shrinkage of the cloth. But it was not foreseeable that this principle can be applied to the already on one side with plastic occupied web-like documents.

Rather, it was to be feared that the plastic application disturbs or even prevents this shrinkage process or that the shear and frictional forces acting on the surface would displace the applied plastic material on the base or even partially detach it from the base. This was to be expected especially in the case of a dot-shaped application pattern, in which the precise arrangement of the relatively numerous and small dots is of decisive importance for the usability of the insert.

In the shrinkage treatment, the base with the plastic coating should be at a temperature at which the plastic material is plastic and deformable, so that it can also follow the shrinkage movement of the pad and no obstruction 'enters through the fixed plastic. Suitable temperatures that can be achieved by heating the pressure roller are ICO to 140 C, depending on the plastic material used, preferably 120 ⁰ C in Polyehtylen.

_. On the other hand, if necessary, by cooling the inhibiting guide, e.g. the brake shoe or the elastic 3andes used, the speed of which is less than the peripheral speed of the pressure roller can be prevented, that due to the frictional forces occurring there are reached too high temperatures.

Preferably, after passing through the pad between the pressure roller and the inhibiting guide, the pad is vibrated, z.3. through a beating wheel. This supports the shrinking process ..

In the present process it may be advantageous Γ ",, if prior to shrinkage of the pad, these previously nor a vapor treatment, preferably · is subjected by the action of water vapor on the non-covered with plastic side of the web. In this way, not only electrostatic charges eliminated but it also reduces the wear of the inhibitory guide, since the shrinking action, especially when used in this case a brake shoe with rubber or rubber surface or opposite the pressure roller slower revolving endless rubber or rubber band, but relatively high shear forces that a The treatment of the substrate with water

Steam now surprisingly causes a reduction of this wear, but without affecting the effectiveness of the shrinkage treatment. The pad can be guided in this treatment so; that their coated side faces the optionally corrugated pressure roller or the inhibiting guide »

It has also been shown that the heat-sealable documents according to the invention, which are first punched or cut in the case of use as interlining fabrics to the desired pieces, no longer tend to roll on or Aufkräuseln, but lie flat, as when applying the plastic latent internal stresses have now been virtually completely removed.

The invention is also an apparatus for performing the method, which is explained by way of example, for reasons of clarity, the drawing can not reproduce all 'institutions to scale.

Embodiment:

The invention will be explained in more detail below. In the accompanying drawings show:

Fig. 1: a schematic side view

a first embodiment of the device according to the invention;

FIG. 2 is a plan view of a corrugated pressure roller circulating with the fabric web; FIG. and

Fig. 3: a schematic side view

a second embodiment of the device according to the invention.

According to Fig. 1, the device has a more or less filled with a synthetic resin powder as a reservoir 1, from which the web-shaped endless pad 2 is coated with dam synthetic resin powder. The reservoir 1 may optionally be provided with a vibration device 5, so that any agglomeration of the synthetic resin powder at individual points in the container or on the way to the base is prevented ..Über an outlet 3, which is completed by a rotating discharge roller 4 trickles Powder in even stream on a guide plate 6 in the form of a loose, loosened veil. The container facing away from the baffle 6 is located in a hollow pyramidal stump 7, in addition to the discharge roller 4, the squeegee 8, the doctor blade 9 and the upper hemisphere of a conveyor and distribution drum 10 receives, which rotates about its axis 11 or 11 with the axis in camps , The circumferential surface of this conveyor and distributor drum 10 is engraved according to the desired pattern and spatially structured, for example, by eirs plurality of hollow-wart or cup-shaped recesses on its surface for receiving more or less powder. The drum 10 is expedient interchangeable to be adapted to the particular circumstances occurring. Non-drawn, known heating and / or cooling devices make it possible to keep the punctured engraved surface of the drum 10 at a certain temperature level or to change it arbitrarily, so that the loosely scribed synthetic resin powder does not stick in the structural esters. Have proven to be useful

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Channels arranged in the drum shell body, through which either a coolant or a heating medium flows. The direction of rotation of the drum 10 runs counterclockwise. Oer on the baffle 6 trickling powder veil therefore initially comes under the influence of the roller blade 8. This squeegee carries a jacket 12, which consists of foam. The core

13 of the roller blade can be designed as a weight weight, so that it comes under the influence of the roller blade 8 for uniform filling of the dot engraving of the surface of the drum 10 with the powder. The synthetic resin powder can be scrawled into the structural tester of the conveyor drum 10 both rolling and brushing * whereby a slight mechanical connection of the powder grains of a single structural space can take place, As far as inevitable Oberfüllungen the engraving have occurred in the powder grains or smaller accumulations on the drum circumference, eliminated the scraper 14 of the doctor blade 9, wherein the effective edge of the scraper blade

14 coincides with a surface line of the cylinder surface which forms the surface of the drum 10, if the irregularities of the engraving is omitted.

By way of the pointwise to be occupied pad '2 is initially a Bewegungsdämmvorrichtung 15, which, as seen in the web movement direction 15, the crowned drafting roller 17 follows. In the direction of movement of the web, a heated roller 18 connects, which rotates about the shaft 19. The heaters customary training, arranged in the form of Trommelmantellcörper in the form of hot oil can be flowed through channels are, because provided as known, not shown. It has proved to be useful, in addition to the heating roller

15 to use one or more preheating rolls,

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otherwise on both sides of the pad. For example, this could also be instead of or in addition to heated rollers under the influence of heat radiators, without again excrete other embodiments of vVärmezuführung. It may also be the already applied to the conveyor drum IO pad 2 during the common promotion of another heat treatment by the pad through subject. The shaft 19 is either under spring pressure or the bearing supporting them are arranged so adjustable,

, - ,. in that the roller 18 applies the base 2 to the peripheral surface of the punctured engraved drum 10 with a respectively selectable pretension. Thereby, the transfer of the powder particles from the surface of the punctured drum 10 to the web 2 begins with the distribution and with the layer thickness, which can be realized on the basis of the previously discussed and shown measures. The temperature of the conveyor drum 10 is brought to a value at which the powder particles have virtually no adhesive action, which would lead to sticking to the surface of the conveyor drum, but in connection with the mechanical consolidation by the Einrakeln are able to the radial force wi-

(Derstehen. In 3etracht are generally between

30 ⁰ C and 100 ⁰ C lying temperatures, depending on the resin used, the conditions change fundamentally within the 3erührungszone the pad 2 with the conveyor drum 10, since the roller 18 heated in the present case to about 200 ⁰ C and on this Temperature is maintained. As a result, the pad 2 is heated accordingly, so that the plastic particles located in the surface engravings of the conveyor drum 10 are currently brought to temperatures at which they strongly adhere to their Bearenzunasflachen zuaewandten the UnterlaGe 2

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Develop properties, while they are relatively cool at their the conveyor drum 10 facing boundary surfaces, in particular room or cooling temperatures, so that the flowability of the powder is maintained. This leads to a mirror image 'transfer of the synthetic resin powder on the base 2.

During the run of the conveyor drum 10 together with the base 2, the powder is temporarily covered on both sides and thereby excluded any attributable to external influences state changes of the predetermined by the shape of the structural ester powder amount. Only when the pad 2 is detached from the surface of the conveyor drum 10 by means of the roller 20, this inclusion and termination of the powder through the casing body and pad falls away. For further "fixation, the roller 20 can in turn be heated If, in addition, further strengthening of the fixation is required or allowed to occur, in this exemplary embodiment, infrared heaters 22 are also provided for supplementary nacroplasticization and sintering between a calender roll 24 and an optionally pivotally mounted roller 25, is then subjected to a steam treatment, preferably by the action of heated, from a along the path of the occupied pad 2 arranged damping system 25 effluent water vapor to the unoccupied side of the pad to then between a circulating with the fabric pressure roller 27 and an applied against the pressure roller inhibiting guide, which is designed as a brake shoe 28 to be passed, wherein the brake shoe 28 on the uncoated side of the textile web a braking effect The inhibiting guide has at its contact surface with the

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Pad one rubber or rubber pad on. The plastic particles applied to the fabric are still plastic to a certain extent or may be made plastic again by heating the roller 27, if necessary. By these measures is achieved according to the invention that even before the solidification of the synthetic resin powder, the occupied pad 2 can relax from the mechanical stress and the influence of elevated temperatures herauswnden stretched state in a non-stretched state, so that a compression and shrinkage of the occupied Pad 2 is carried out without causing the applied plastic material is moved to the pad or even detached from it. The roller 27 has at its periphery a substantially axially extending corrugations 29, whose longitudinal axes are inclined relative to the longitudinal axis of the roller 27, as shown in FIG. 2. The apexes 30 of these corrugations are rounded.

The pad 2 is by means of one of the pressure roller 27 downstream of Schlagrad 31, consisting of a roller with radial projections 32, vibrated. These vibrations assist the clean separation of the pad 2 from the roller 27 and in particular serve a uniform relaxation of the pad to a non-stretched state. As a result, the pad is removed via guide rollers of the system.

In the embodiment shown in Fig. 3, an elastic 3and 33 is provided as an inhibiting guide instead of the brake shoe 23, which is guided over tension rollers 34, 35. These tension rollers are adjustable by means of diagonal biasing means 36, 37, for example, micro-screws may be provided for fine adjustment, this band 33 can not

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be too soft rubber band, and facilities may be provided to cool this band. For cooling the band, for example, a cooling bar can be installed or it can be cooled by means of slasluft.

The temperature of the elastic band 33 is suitably set to 60 to 75 C, while the temperature of the heated roller 27 (preferably with mandrel and roller are oil-heated) can be controlled to 80 to 92 ⁰ C. At the mentioned setting of the temperature of the strip, together with the rolling heat results in the optimal working behavior in the now usual documents at a belt speed of 30 to 50 m / min. However, the belt speeds can be between 10 and 100 m / min, and are always set lower than the rotational speed of the pressure roller 27. The corrugation 29 of the roller 27 is to be treated in a particular case to be treated pad 2 and the distribution and thickness of the coating. In an extraordinarily finely divided coating, the proposed method can be carried out with a roll which has no shrinkage.

The pad 2 is usually performed so that the coated side of the roller 27 faces. At a certain density of the coating, it may also be advantageous to guide the pad so that its uncoated side faces the roller.

The essence of the proposed method is the possibility of realizing many other advantages. Thus, there is the further possibility of supplying the substrate immediately after the implementation of the proposed method a further web and bonding it to the coated substrate. It is

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Furthermore, it is possible to coat the substrate with plastic on both sides and then to use it as two-sided adhesive Sinlagestoff between two further creams.

If it is necessary for spatial or other fabrikatorischen reasons, the processing operation after the post-plasticization, before the calender rolls, or even after the calender rolls, can be interrupted.

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Claims (14)

invention demanding 1. A process for the production of plastic-coated web-shaped documents, characterized in that a plastic by means of a patterned depressions having conveying surface on a heated pad after low pressure method is applied, wherein the synthetic resin is applied in powder form to the conveying surface, which has a temperature at the powder flow still remaining-and sticking to the. Conveying surface is avoided while the pad is erhi-tzt to a temperature at which the synthetic resin softens and becomes sticky, whereupon the coated substrate before its cooling or optionally after reheating between a rotating pressure roller and a movement around the roller inhibiting guide is passed so that a compression and shrinkage of the substrate and plastic coating occurs. 2. The method according to item 1, characterized in that the coated base is treated with water vapor before compacting and shrinking. 3. The method according to item 1 or 2, characterized in that a heated pressure roller is used. 4. The method according to any one of items 1 to 3, characterized in that the coated base is set after being carried out between the pressure roller and inhibiting guide in vibration. - i7 , Apparatus for carrying out the method, characterized in that a device for supplying a synthetic resin powder to a movable past it, be heated or cooled conveying surface (10) whose surface has patterned recesses for receiving the synthetic resin powder; a heatable roller (18) supplying a support (2) to be coated and leading to the conveyor drum (10), the conveyor drum (10) arranged downstream of _a pair of roller rollers (24, 25), an adjoining damping system (26) for applying hot steam to the non-plastic-coated side of the base (2), a pressure roller (27) arranged downstream in the direction of movement of the web and circulating with the base (2), and the movement, the base ( 2) are provided around the pressure roller (27) inhibiting guide. 6. The device according to item 5, characterized in that the inhibiting guide as a against the pressure roller '. (27) adjacent coolable brake shoe (28) is formed. 7. The device according to item 5, characterized in that the inhibiting guide as a via rollers (34, 35) guided, to the pressure roller (27) fitting elastic band (33) is formed, relative to the pressure roller (27) at a lower speed circulates. 8. Device according, one of the items 5 to 7, characterized in that cooling means for the movement of the pad (2) inhibiting guide are provided. 9. Device according to one of the items 5 to 8, characterized in that the pressure roller (27) has on its peripheral surface a substantially axially extending corrugations (29). 10. The device according to item 9, characterized in that the longitudinal axes of the corrugation (29) relative to the longitudinal axis of the pressure roller (27) are inclined. 11. Device according to item 9 or 10, characterized in that the corrugation (29) has rounded apexes (30), 12. The device according to item 5, characterized in that the AnpreSwaüize (27) has a smooth surface. 13. Device according to one of the items 5 to 12, characterized in that as a striking wheel (31) formed and radial projections (32) having roller for vibration of the coated substrate (2) is arranged downstream of the inhibiting guide. 14. The device according to item 5, characterized in that the conveying surface (10) is associated with a take-off roller (20), via which the base of the conveying surface (10) is deflected and removed. 15. The device according to item 14, characterized in that the take-off roller (20) is designed to be heated. - For this 2 sheets drawings -