WO1991001211A1

WO1991001211A1 - Method and means for the production of pile surfaced products from thermoplastics

Info

Publication number: WO1991001211A1
Application number: PCT/SE1990/000491
Authority: WO
Inventors: Peter R. FANTO-KÜRTÖS; Roland SPÅNGBERG; Jan-Åke HAGGREN
Original assignee: Vigesco Industrier Ab
Priority date: 1989-07-17
Filing date: 1990-07-16
Publication date: 1991-02-07
Also published as: SE8902540L; SE8902540D0

Abstract

Method and arrangement for the production of a product with a piled surface of thermoplastics on a web. A layer (9) of thermoplastics is put on the upwardly turned part (4) of a conveyer (1) which occurs in the first zone of said conveyer part. In a second zone the plastics layer is heated by means of rays from an aggregate (12). In a third zone the web (14) is laid down against the heated plastics layer. In a fourth zone separation of the web from the surface of the conveyer occurs whereby the threads which make the piled surface are formed. This occurs by pulling the web over a deflection organ (16) where air cooling of the formed threads occurs. The temperature is conducted selectively in the different zones with the aim to obtain a temperature which is suitable for each step.

Description

Title:

Method and means for the production of pile surfaced pro¬ ducts from thermoplastics.

Technical field: The present invention relates to a method for the produc¬ tion of products having a piled surface of thermoplastics according to the preamble of claim 1 and a means for per¬ forming the method according to the preamble of claim 5.

Prior art:

By the possibilities that arose through the creation of the thermoplastics, the idea was brought up that on a surface thread-shaped creations could be obtained by letting a heated plastics stick to two surfaces, which are pulled apart whereby the plastics creates threads. An early proposal to use this idea is described in the Swe¬ dish Patent 329 892, Seiffert. In a preferred embodiment of this patent, a plastic layer is applied between a fab¬ ric which shall be included in the finished product and a surface on a part of the production means. When the sur¬ face of the fabric and the surface of the machine part, after having pressed the heated plastics between themsel¬ ves, are drawn apart by running in divergely moving tracks, the plastics will be maintained on the fabric when pulled away from the surface of the machine part whereby a pile of threads is made on the surface of the fabric. In the area where the threads are made, the pla¬ stics is cooled by means of an air stream so that the plastics from its viscose, melted phase is transferred into a solid state. In the publication a means for carrying out this produc¬ tion method is shown as two bands, which by being carried by two rollers, which meet in a narrow play between them¬ selves, press the plastic layer and said fabric. From this play the bands diverge and form said zone in which the plastic threads are drawn out from the surface of the machine part, which one of the bands forms. The second band is, accordingly, a substrate for said fabric. A nozzle for cooling air is arranged at a place where the bands start to depart from each other.

The principles mentioned in said patent have been used to further develop the method. Thus, in the Swedish Patent 7114853-0 is disclosed that cooling occurs from the rear side of the fabric instead of directly against the threads, which are formed on its front side. Further it is proposed in the Swedish Patent 7316292-7 that the fab¬ ric runs over a pulling means at an angle which deviates from the tangent to the cylindrical surface of a roller around which a fabric runs, and that the pulling means is provided with air holes through which a cooling stream can be blown through the fabric which is air per-meable.

In the Swedish Patent 75005524-4 is, additionally, the location of such a pulling means, compared to the surface of the roller, discussed so that a steeper departing angle between the fabric and the surface of the opposing machine part is obtained than what is obtained through a play between rollers.

At all these inventions, which are developments of the basic invention in the publication first mentioned, it is presumed that the plastics is fed between two surfaces or rollers, which at the same time carry out the feeding, heating and pulling apart of the thermoplastic material layer. This is the object of the Swedish Patent 337276. In this is stated that means for this function is common and consists of a driven roller which can be heated and said fabric, which shall be included in the product and which via the plastics layer runs against the heated roller.

If one analyzes what occurs in the different zones along the manufacturing way, which a certain part of the pla¬ stics material passes during the production of threads, one will find the following:

1. A layer of a thermoplastic material, polyethylene has proved to be usable, is applied on the sur¬ face of a heated roller.

2. By means of a second roller a fabric, such as fibre web, is pressed against the heated plastic layer on the surface of the first roller, which layer now is in a viscose, liquid state.

3. Adherence of one side of the fabric, which is directed towards the plastic layer, through the sticking of the plastic in its highly viscose state against the surface of the fabric.

4. Departing of the surface of the first roller from the fabric which runs tangentially out from the second roller whereby the plastic layer substan¬ tially will follow the fabric when it is pulled off from the surface of the first roller.

5. Forming of threads at said pulling off from the surface of the first roller by melt breaks in the viscose plastics, which threads protrude from the surface of the fabric. 6. Pulling the fabric over a rod-shaped means at a larger diverging angle compared to the surface of the first roller than what can be obtained through the above-mentioned tangential pulling, whereby the fabric will rest against the means by its rear surface, which opposes that surface on which the threads have been formed.

7. Blowing air against said rear side of the fabric, preferably through the means whereby air will penetrate through the air permeable fabric and out between the threads formed.

8. Cooling of the plastics material which has formed the threads, primarily by means of said air stream so that the plastics comes into a solid state and forms a piled surface.

Particularly during that part of the process from the point that the plastics layer has been introduced into the process, and to the point where the threads have been formed at the surface of the roller and the departing of the web from the rollers, many process steps with mutual¬ ly different requirements shall be carried out with the same means.

Thus, the heated roller shall first have such a tempera¬ ture that the plastics layer gets a suitable viscosity for its sticking to the surface of the web. Thereafter shall, with the same roller the plastics layer partly be pressed under suitable pressure to get a good attachment to the web, and partly the roller itself shall stick to the plastics layer.

When this has occurred the forming of the threads shall be started, maintaining a temperature in the plastics la- yer that simultaneously gives a suitable viscosity for the forming of threads and a viscosity that gives re¬ quired maintenance of the plastics on the surface of the web at which at least the main part of it shall remain, and on the surface of the roller from which departing shall occur, but not until threads with required lengths have been pulled out.

Finally, the roundness of the roller and the tangential pulling off of the web shall form such an opening, the geometry of which is adapted to give the initial thread forming before the web is pulled over the means and the plastics is cooled.

As, in the solutions described in the patent literature referred to, it is presumed that the control of the tem¬ perature, the pressing and forming of a geometrically acceptable pulling-off opening, shall be carried out with only one roller, the fullfilment of the process demands in the different zones, must be solved by compromise. The diameter of the roller must be adapted to obtain said geometry in the pulling-off opening; air roller with a too large diameter will give a too slow departing of the surface of the roller from the tangentially running web and a too small diameter can under certain circumstances give a too quick opening for the pulling off. At a dia¬ meter area, which one for this and other reasons has to work with, it is not possible to vary the temperature along the surface of the roller when it rotates and the temperature will accordingly become a compromise, which shall give good adherence of the web as well as main¬ tenance of the plastic layer on the same and adherence on the surface of the roller and suitable viscosity for the thread forming. The quality of the products manufactured has shown that this need of compromising has not been very successful. Thus, it has been shown that it is difficult or im¬ possible to get an even thread forming. The surface will instead be covered by threads with different dimensions and band layers in which the plastics has not been drawn out to threads but to a continuous band. That can be tolerated for a product by which the appearance, isolat¬ ing abilities and some other factors do not have an appreciable importance. As such a product, floor mop clothes not to be reused can be mentioned and the method has accordingly also been used practically solely for the production of such clothes. For the widespread product area which is mentioned in the Swedish Patent 7505523-6, where a great number of decorative purposes have been mentioned, the material can be used to a limited extent, for example a decrease of the length of the thread is required if an even pile is required.

A very important factor, which depends on the control of the temperature, is the sensibility of many plastics ma¬ terials for over-heating. The area between suitable vis¬ cosity and over-heating, when the plastics material is deteriorated, is very narrow. This also makes the number of useable polymers limited. Besides that, the selection of materials for the web is limited as some materials do not stick to the plastics at the temperatures that have to be used to obtain thread forming. This further limits the selection of products for which the material can be used.

Solution and advantages:

The object of the present invention is to attain a method which allows separate control of said factors so that at each process step the most optimal conditions can be reached. The invention also has as an object a means for carrying out the method. Through *he present invention a possibility now is obtained to conduct the process in such a way that the fibre pile that one wants to produce can be produced in an easily reproducible way, using a wide area of polymers and webs that are to be included in the product.

A further object of the invention is to use a material which solely consists of thermoplastics without the need of using a carrier of a second material. That means that on the surface of the plastics layer, fibres shall be formed at a temperature adapted for that whereas an underlying part through a lower temperature is kept in such an unbroken shape that it can be used as a layer for carrying the piles.

The objects of the invention are obtained by performance of the method, including the features which appear from claim 1, and a means with the features stated in claim 5.

Description of the figures:

In the following an embodiment example of the invention shall be described with reference to the attached drawings. In the drawings are shown:

Fig. 1 a schematic picture of a machine by which the process for the production of the material is illustrated;

Fig. 2 shows in a side-view more in detail a machine for performing the production process, the main parts of the machine are shown in the same positions and the same sizes which are used in the schematic Fig. 1; Fig. 3 shows in an enlarged scale compared to Fig. 1 and Fig. 2 a part of the machine in Fig. 2, and

Fig. 4 shows an end-view of the machine in the same scale as in Fig. 1 and Fig. 2.

According to Fig. 1 a conveyer band 1 has been arranged to be driven over a rear roller 2 and a front roller 3 with an upper part 4 of the conveyer running from the roller 2 to the roller 3. The conveyer may consist of steel or some other material which, without being de¬ stroyed or loose its shape or strength, can be heated to the working temperature for the polymer to be used in the process. Suitable working temperature should be in the area of 130-260°C. The conveyer band has a sufficient width producing the desired width of the material to be produced, and it is presumed to be substantially plane even if certain other shapes are thinkable. The roller 3 is driven by an aggregate 10, comprising a motor and a belt transmission.

The whole arrangement is supported by a frame 11 which, however, is shown only partly in Fig. 1.

An extrusion tool 5 has been arranged above the roller 2. An extruded plastics layer 9 is moved via the rollers 6, 7,8 to the upper part 4 of the conveyer band. All or some of the rollers 6-8 have suitably a cooling function so that, at the melting point, the extruded plastics, gets a shape which is sufficiently strong for its transfer to the conveyer band. The plastics layer does not necessar¬ ily have to be extruded in connection with the now de¬ scribed process and it can be produced as a foil to be fed into the machine on its conveyer band. Above the upper part 4 of tl - conveyer between the rollers 2,3 there is a heating aggregate 12, comprising radiators for infrared radiation down to plastics layer 9 on the conveyer 1.

After the aggregate 12 a pressure roller 13 has been arranged under which a carrier web 14 is fed. The layers between the roller and the conveyer band 1 are according¬ ly counted from the latter, the plastics layer heated by the heated aggregate 12 and the carrier web 14, which is pressed down into the plastics by means of the roller 13.

Approximately where the upper part of the conveyer 4 ends to continue in the part enclosing the roller 3, is a list-shaped organ, in the following called the deflection list 16.

The system has further been provided with two cooling arrangements. One is in the following called the band cooling aggregate 18. It has in Fig. 1 been shown as a nozzle 19 for cooling medium and a shield 20. The con¬ veyer cooling aggregate is arranged between the area where the web 14 is pressed down into the plastics layer and the deflection list, that is, in front of the roller 3. The nozzle is intended for spraying a cooling medium, which according to the cooling demand can be air or water. In practice it has been shown to be suitable to have a cooling medium which is air mixed with water, that is, water fog. With such a cooling medium, the cooling effect may be controlled accurately by having different proportions between air and water. The cooling medium can also at this mixture have a good distribution for even cooling of the conveyer 1. The second cooling arrangement is located in the area where the web 14 is torn away from the conveyer band 1, that is, at the deflection list 16. It is at this point that the fibres are formed in semi-melted shape from the plastics. Immediately after the forming they have to be cooled so that the plastics shall resume its solid shape. Such a cooling occurs best with air, which by means of a nozzle is blown into the fibre-forming area. In Fig. 1 it is assumed that the deflection list 16 is shaped as an extended air nozzle, which extends over the width of the conveyer. The cooling air is accordingly introduced from the rear side of the web 14 and through the web and into the fibre-forming area. A condition for this is that the web is air permeable and, accordingly, preferably made of textile. A web can be used, but a non-woven fibre web has proven in many products to be suitable. The cooling air can, however, also be introduced from the fibre side by means of an extended nozzle. Such a nozzle is, however, not shown in Fig. 1.

The arrangement shown in Fig. 1 of the heating aggregate 12, the pressure roller 13 for the web 14 and the deflec¬ tion list 16 and the two cooling locations can, to some extent, deviate internally in relation to what has been shown. One may presume that the heating aggregate 12 with at least some part must be located in front of the pressure roller 13, but it can also have a part after the roller. The cooling zone for the aggregate 18 can be further extended backwards compared to the direction of running of the conveyer 1. The cooling of the fibres for¬ med must, however, occur close to the area for cooling off of the plastics layer as has been described earlier. Changes of this kind may be dependent of the properties of the plastics and the shape and the properties of the conveyer and the desired length, thickness etc. of the threads formed. A production arrangement has now been described with regard to its main parts and with reference to Fig. 1, which shows the arrangement in a simplified way. The co - plete machine concept, however, comprises further parts, as shown in Fig. 2, but which, for the sake of clarity, has been excluded from Fig. 1. As shown, the frame 11 has two gables 30 and 31 (see also Fig. 4) which, like the frame, consist of square pipes. The gable 30 carries the extruder tool 5 whereas the extruder itself stands at the side of the arrangement shown. The gables are united at their upper ends by pipes 32, which carry, besides the earlier mentioned and permeable suspended pressure roller 13, also further rollers 21,22,23 and 24 for a conduction of the carrier web 14 from a supply roller (should be lo¬ cated to the left in Fig. 2, but is not shown). Between the rollers 22,23 the web extends substantially horizon¬ tally and turns thereafter downwardly to meet the con¬ veyer 1 at the pressure roller 13. The latter is together with the rollers 21,22 suspended in a downwardly extend¬ ing part of the frame, which starts from the pipes 32. A lower part 33 of the frame carries the conveyer arrange¬ ment with the conveyer band 1 and the rollers 2,3. Be¬ sides that, the conveyer cooling aggregate 18 and the earlier mentioned deflection list 16 are carried. This latter is carried by an adaption arrangement 26, which also carries a roller 27 to cooperate with a roller 28 on the frame pipes 32 for the conduction of the web after it has left the deflection list 16. This part of the web has the denotation 25 whereas the part to the deflection list 16 is denoted 14 as mentioned earlier.

The adaption arrangement 26 for the deflection list is shown more in detail in the partly broken view in Fig. 3. As appears from Fig. 3, the deflection list 16, carried by the adaption arrangement 26, has the form of a pipe with an interior chamber 30. A lip 31 protrudes from the organ and it ends into an outer plane 32 with relatively sharp edges. The inner chamber 30 ends in the plane in a narrow opening 33. As appears from Fig. 4, the arrange¬ ment has a width that permits passage of a web 14,28 with a width which is adapted to the desired width of the product. The deflection list 16 has at least the same length as the width of the web, and the outer plane 32 and the opening 33 have a corresponding length. Inner chamber 30 is connected to an air pressure source.

The deflection list 16 is kept at its end by side pieces 35, which are connected to a shaft arrangement 36 with a short shaft at either side and outside the ends of the deflection list. The centre of the shaft is approximately in line with the lower edge of the outer plane 32 shown in Fig. 3. By turning the side pieces and, consequently, the deflection list around the shaft arrangement 36, the deflection list will, accordingly, swing approximately around a line through the outer plane 32 with its narrow opening 33. At its upwardly directed side in Fig. 3, the deflection list carries a roller 38, which has at least the same length as the deflection list. A further roller 39, with the same length, is carried by two horse-shoe- shaped side parts 40, which are attached at the respec¬ tive side pieces 35. Beams 42, which are included in the frame 11, carry the shaft arrangement 36 and, according- ly, the whole adaption arrangement. These beams 42 are themselves swingable around shaft arrangement 43 compared to the fixed parts of the frame.

Via ears 47 at each end of the adaption arrangement, the latter has been united with a link system 44 at each end of the arrangement (see Fig. 2, in Fig. 3 only one link is shown, denoted 44) . The link system can be influenced by two power cylinders 45. In the position shown in Fig. 2, two links of the link system 4 form an angle to each other and the distance between their outer part, of which one is formed by a stub axel 46 (Fig. 3) in each ear 47 and the second by a shaft mounting in the rigid part of the frame, is decreased. This means that the adaption arrangement 26 is pulled downwardly when swung around the shaft arrangement 43. This lower position is the working position of the arrangement. If the piston rod of the power cylinders 45 are pulled out, the link system will be straightened and the adaption arrangement, together with the deflection list 16, will be raised by swinging around the shaft arrangement 43. This upper position is a free position.

Two further power cylinders 50 have been arranged (Fig. 1, 2) with a piston rod 51, which influences the adaption arrangement at the outer side of its swinging point in the shaft arrangement 36. More accurately, the piston rod 51 attacks at the point 52 on the respective horse-shoe- shaped side parts 40. By means of the power cylinders 50 it is possible to swing the whole adaption arrangement 26 including the deflection list 16 around its shaft arrang- ement 36. In the upper position shown in Fig. 2 and 3, the organ has its working position. When the piston rod has been pulled in, the rollers 38 and 39 are located approximately along a horizontal line.

As further appears from Fig. 2, a heating aggregate 12, is carried by the lower part 36 of the frame as well as an isolating element 54. Such as the heating aggregate 12 may be arranged in different ways along the upper part of the conveyer 1, the complementary isolating arrangements may have a different construction than the one shown as the element 54. Through disposition of the heating aggre- gate and the isolating arrangements and the cooling arrangement 18, the plastics laid down on the conveyer can be given exactly the temperature in the different parts of the band which is required for the treatment step that the plastics is to be subjected to in respec¬ tive parts. What is to be carried out along the process way, which the band does, appears from a summary in the preamble of the description.

As mentioned earlier, a supply roller for the web 14 has been arranged close to the arrangement shown in the fi¬ gures. Besides that, there shall be a roller for winding up the finished material, which in Fig. 2 is denoted 25, and which leaves the arrangement at the roller 28. This completed material consists then of the web with the pla¬ stic material coated on, which has a pile of fibres co¬ vering one surface of the web. (In Fig. 2 the uncovered web 14 is shown as a relatively thick line whereas the covered web 25 has been designed as a double line, where the area between the lines shall indicate the plastics layers.)

Before starting the machine, the web 14 is pulled out from the supply roller and is fed over the rollers 24, 23,22,21 and between the pressure roller and the conveyer band 1. In its continued stretching after the pressure roller 13, the web is conducted under the deflection list and over the side of the roller 38 which faces the de¬ flection list and on the opposite side of the roller 39 and, finally, out over the roller 28 to the core of the roller arrangement that shall wind up the completed ma¬ terial. At the insertion through the adaption arrangement 26, this is swung over to its upper free position, so that the link system 44 has been straightened out. At the same time the deflection list itself is swung to its lower position by pulling-in of the piston rod 51. The rollers 3P 39 are then located approximately along a horizontal line in this positioning of the machine. At the insertion, the deflection list 16 is pulled up from the conveyer band, which is necessary, and through the lower position of the roller, the insertion through the adaption arrangement will be easier than if the conveyer should have to be bent upwardly.

After the insertion of the web the arrangement will be brought to working temperature, which occurs by starting up the heating aggregate 12, which is kept switched on during simultaneous driving of the wire 1 by means of the driving aggregate 10.

When the machine is expected to have reached its working temperature, it is suitably provided with temperature sensors along the process way, the extruder can be started. It is connected to a feeding arrangement for the supply of plastics material. This is melted and pressed out through the extruder tool 5 and forms a plastics layer with primarily the same width as the web. It is conducted via the rollers 6-8 over to the conveyer 1. To start the extruder, this must be done manually, but dur¬ ing the continuous work the layer is pressed out from the extruder and conveyed out under stretching as it follows the conveyer 1 through the rollers. Especially the roller 6 may be construed as a cooling roller, which reduces the temperature of the viscose plastics at the extrusion to give the layer such a great strength that it the whole time may be drawn by the conveyer 1.

However, the plastics layer has a somewhat elevated tem¬ perature as the conveyer has in its continuous work. The temperature of the conveyer makes the plastics partly melt so that it adheres to the conveyer. The starting temperature is maintained to some extent through the iso- lating elements 54. The plastics layer will under the continued movement of the conveyer be fed under the heating aggregate 12. Its infra-rays heat the plastic material, but the rays do not, however, hit the conveyer directly. It is, however, heated through some conduction from the plastics material. By a suitable arrangement of the heat-ing aggregate, the plastics may be given such a tempera-ture, that it becomes liquid, that it adheres to the conveyer, however, without being too thin or heated so high that it starts to deteriorate.

In this heated condition the web 14 is pressed down against the upwardly turned surface of the plastics by means of the pressure roller 13. The web is then attached to the plastics layer, which now is between the conveyer 1 and the web. By adapting the temperature of the conveyer and the intensity and duration of the heating (depending of the length of the aggregate and the velocity of the conveyer) different temperatures may be obtained also within the thickness of the plastics.

The next process step is that the web shall be torn away from the conveyer. The plastics will then strive at being attached to both the web and the conveyer. This attach- ment shall have a certain character which is obtained at a certain temperature of the plastics. The temperature that the plastics has when it is attached at the web and the conveyer, by being pressed between these two, is pre¬ ferably higher than the temperature that the plastics will have when the tearing off-operation will occur. The fact is that during this tearing off-operation the pla¬ stics will first be torn out so that melting breaks "occur in its mass.

Thereafter it shall be separated from the conveyer and then preferably as completely as possible, whereas the plastics to .such a great extent as possible shall be included in the product that consists of the web and the plastics which has been drawn out to fibres/threads. If the temperature is too high the plastics will have a tendency to stick to both of the surfaces and it can then more get a character of a glue-layer on both surfaces and not, as is strived at, as a pile surface on the web. On the contrary, at a lower temperature the strength of the plastics is higher and it adheres initially to both of the surfaces long enough for the threads to be shaped in the play between the two surfaces. This temperature can, however, be too low to get the good adherence to the sur¬ faces that is desired in the area of the pressure roller 13. It has turned out to be especially favourable if cooling occurs from the conveyer side. One will then first get an adherence of the plastics to this so that the threads have time to be formed whereupon a break occurs close to the cooled surface and one can get the plastics to separate practically completely from the sur- face of the conveyer. This is very advantageous as one in that case will only get a very slow build-up of some re¬ sidual plastics layer on the conveyer. If such a plastics layer should be built up quickly this should require fre¬ quent scrapings of the conveyer and an amount of lost plastics as a consequence. Burned plastics can also give rise to inconvenient smoke formation.

Said separation occurs in the area of the deflection list 16. The controlling instrument 26 will then take the position shown in Fig. 2 and 3. The lip 31 of the deflec¬ tion list will then be located with its end close to the surface of the conveyer. The web is drawn relatively sharply up from the surface of the conveyer under a cer¬ tain deflection over the sharp edges of the end surface 32. This drawing off with a relatively quick separation of the web from the surface of the conveyer and said de- flection, gives ideal conditions for the fibre formation together with said cooling, which is brought about by means of the cooling aggregate 18. This cools then the rear side of the conveyer and the heat is conducted away from the conveyer and influences only the very closest layer of the plastics. The location of the rollers 38,39 in the working position gives the ideal angles for the separating operation. Through said adaption possibilities of the adaption means, the working position and the blow- ing angle of the cooling air against the conveyer can be regulated within certain limits and the deflection list can be located at different distances from the conveyer. By this, the best conditions for different products can be obtained.

When passing the deflection list 16 the web is cooled from its rear side by air streams from its inner chamber 30 and out through the opening 33. The web is often air permeable, non-woven has been mentioned as a suitable material for the same, and the air will accordingly flow out through it and through the pile of fibres. Attempts have shown that it is the cooling from the air that in¬ fluences the fibre formation and the final adherence of the fibre on the surface of the web. The formation of the fibre, however, occurs, which investigations have shown, only by the separation of the soft plastics layer and not through any kind of blowing influence through the stream¬ ing of the cooling air through the web and out through the fibre pile.

After the formation of the fibres (in this condition the web is denoted 25, as already mentioned) it is further conducted upwards over the roller 28 and to the material roller for winding up and further making up. It has above been shown how plastics materials by means of the specific construction of the machine with different heating and cooling zones, can be given exactly the correct treatment during the process way. This has in connection with the invention given great possibilities for the production of a high quality product within a wide area of desires and specifications. Also, a favourable working condition for the machine is obtained by avoiding the deterioration of the plastics, followed by smoke formation and poisonous gases.

The important function of the invention, to obtain an adapted temperature in the different production zones, is obtained as shown in the description by proper adaption of the function parts in the different zones with regard to performance and effect. One can then besides through material adaption influence the process by different speed of the conveyer, different effects of the infra- rays, different placement of the deflection list and through different cooling of the conveyer arrangement and the plastics cooling arrangement in connection with the deflection list. At a proper adaption of these and other factors, one can while working obtain a continuous pro¬ duction which gives the desired product quality.

However, it also lies within the scope of the invention that one carries out a direct regulation of the condi¬ tions in the different zones by means of measuring in¬ struments for the temperature and it is thinkable also of the viscosity of the plastics. By means of suitable pro¬ cess steering measuring results are used to maintain the desired continuous conditions in the process so that also in very sensitive situations the desired product quality can be obtained. _*

Such measuring and regulation equipment can, however, based on the previous description, be arranged by the man skilled in the art without further directions. The most important in this connection is that the process and the arrangement have the appearance which has been explained in the foregoing with different treating zones in which relevant conditions can be regulated selectively.

The arrangement and the method, which is carried out in connection with the arrangement, can within the scope of the following patent claims be given different embodi¬ ments without departing from the inventive idea.

Claims

Claims :

1. Method for the production of a product having a surface of thermoplastics and comprising the steps: - production of a layer (9) of thermoplastics; - arranging the plastics layer manufactured on a surface (4) which is moveable in the direction of the working; heating said plastics layer on said surface; pressing a web (14) against that side of the heated plastics layer which is turned away from said surface; separating the web from the surface moving in the working direction whereby said heated plastics form threads which together make the surface; - cooling the threads formed by means of an air stream so that the plastics resumes a solid state; c h a r a c t e r i z e d therein that, as said surface, the upwardly turned part (4) of a conveyer (1) , moveable in the working direction with said part is used, the plastic layer (9) is arranged on the conveyer at a first zone of said part of the conveyer calculated in the work¬ ing direction, that the plastics layer is heated by means of rays from the outward side of the conveyer by means of heat rays in a second zone of the conveyer, that in a third zone the web (14) is laid down against the heated plastic layer and adhered to the same by means of pressure, that the separation of the web from the surface of the conveyer under formation of the threads occur in a fourth zone of the conveyer by pulling the web over one deflection organ (16) with a width equal to the web, and that air cooling is carried out in the area of the de¬ flection organ, whereby the temperature is conducted selectively in the different zones with the aim to obtain a temperature adapted for each step with regard to the effect of the temperature of the viscosity of the pla¬ stics, its sticking ability, tenacity/thread-forming ability and adherence, respective separation ability relative to the web and the surface of the conveyer.

2. Method according to claim 1, c h a r a c t e ¬ r i z e d therein that between the putting down of the web (14) in the plastics layer (9) in a third zone and the separation of the web from the surface of the conveyer, the plastics is subjected to cooling from the temperature it was given in the second zone for the putting down of the web.

3. Method according to claim 2, c h a r a c t e ¬ r i z e d therein that the cooling after the putting down of the web into the plastic layer occurs through cooling of the conveyer (1) for lowering the temperature of the plastic layer through cooling in the direction from the side towards the conveyer.

4. Method according to claim 1 or 2, c h a r a c ¬ t e r i z e d therein that the air cooling of the threads at least primarily occurs through blowing in air through the web (14) which is air permeable from the de¬ flection organ (16) .

5. Arrangement for the production of a product with a pile surface of thermoplastics by means of the method according to any of the claims 1-4, comprising

- an arrangement (15) for the production of a pla- stic layer (9) ; a part (1) with a surface (4) which is moveable In the direction of he working; an arrangement (6-8) for putting down the plastics layer on the surf ce; an arrangement (12) for heating the plastics layer on the surface; an arrangement (13) for putting down a web (14) against the heated plastics layer (9) ; and - a means (16) for the separation of the web from the surface; c h a r a c t e r i z e d therein that the surface con¬ sists of a conveyer band (1) , the upwardly directed part (4) form said surface, the arrangement (5) for the pro¬ duction of a plastics layer (9) is adapted to put the plastics layer in a first zone calculated in the moving direction of the conveyer on its upwardly directed part, that the arrangement for heating the plastics layer con¬ sists of an aggregate (12) for heat rays, which is arranged above the second zone of the conveyer, that the arrangement for putting down the web against the plastics layer consists of a pressure roller (13) or the like, which has been arranged in a third zone of the upwardly turned part of the conveyer, and that the arrangement for separating the web (14) from the surface of the conveyer consists of a deflection organ (16) arranged at some dis¬ tance from the surface of the conveyer and an arrangement (38,39) for pulling under stretch of the web, and that the arrangement for cooling of the threads formed con¬ sists of an arrangement for blowing out air through the deflection organ into and through the web and into the area of thread-forming, whereby along said part of the conveyer, organs for selectively conducting the tem¬ perature of the different zones have been arranged.

6. Arrangement according to claim 5, c h a r a c ¬ t e r i z e d therein that between the pressure roller (13) or the like in the third zone of the conveyer and the deflection organ (16) an arrangement (18) has been arranged for cooling the conveyer from its rear side which opposes said side.

7. Arrangement according to claim 6, c h a r a c ¬ t e r i z e d therein that the arrangement for cooling the conveyer consists of at least one nozzle (19) for the blowing of an air-watermixture against the surface.

8. Arrangement according to any of the claims 5, 6 or 7, c h a r a c t e r i z e d therein that the deflec¬ tion organ (16) is provided with a contact surface (32) for the web where it is separated from the surface (4) of the conveyer, which is provided with substantially sharp edges and between these a slot (33) for the blowing of air against the web, whereby the organ (16) is swingably suspended around a swinging shaft (36) , which substan¬ tially runs in said contact surface (32) .