KR880001952B1 - Method of bonding a floor-covering web with a backing web - Google Patents

Abstract

Artificial grass was prepd. by gluing a flooring web backcoated partially with thermoplastics to a backing material uppercoated partially with thermoplastics. Thus, pile webs and backing webs are fed simultaneously and are guided face to face to each other to position the lower part of pile web on the upper part of backing web before the two webs are glued. Then one of the thermoplastics of the lower part of pile webs or the upper part of backing webs is heated to plasticize and the two webs are glued to give the water permeable artificial grass.

Description

Bonding method of back side web to floor covering web

1 is a perspective view obliquely from below looking at a portion of the grass web forming the artificial grass.

2 is a view of a part of the backside web obliquely from above.

3 is a schematic side view of an apparatus according to the invention for carrying out the method of the invention.

3 is a schematic side view of an apparatus according to the invention for carrying out the method of the invention.

4 is an enlarged view partially cut along a vertical plane of a portion of the device where two webs are bonded to each other.

5 is a view of part of the conveyor belt shown in FIG. 3 as viewed obliquely from above.

6 is a cross-sectional view of a final product made according to the method of the present invention.

The present invention relates to a method of adhering a bottom web made of a pile material at least partially covered with a thermoplastic material to a back web having an upper surface at least partially formed of thermoplastic material. In particular, the present invention relates to a method for producing artificial grass for playgrounds.

Such artificial turf has already appeared on the market, and when installed for use, the upper web is a thermoplastic material, for example, which has a pile yarn or pile ribbon fixed and whose back side improves the firmness of the pile yarn in the substrate between different materials. For example, it provides a base substrate that is wholly or partially covered with soft PVC. When installed for use, the bottom web is a sealed or perforated elastic mat, for example consisting of a core, such as a woven or knitted fabric coated with soft PVC. The two webs are permanently bonded to each other.

It is an object of the present invention to provide a method of simply bonding two webs prior to laying a floor coating, which method can be carried out continuously, e.g. a larger amount of two webs can be used in a rolled state. Economical and permanent bonding.

This problem is, in accordance with the present invention, moving both webs in the longitudinal direction simultaneously, leading them to face each other before they are bonded, so that the bottom face of the bottom covering web and the top face of the backing web face at least one heat source. When guided and installed for use, at least partially plasticize the coatings on the back surface of the bottom covering web and the top surface of the back covering web by heating, and place the two webs facing each other. It can be solved by gluing together (this process can be referred to as heat sealing process). When carrying out the method of the present invention, there is no need to go through relatively complicated steps such as using an adhesive or sewing two webs together. In addition to this, the method of the present invention achieves an adhesion that is surprisingly easy to control in the event of arbitrarily altering the method to bond the entire surface or only a portion thereof.

For example, it is possible to heat webs that are glued only along strip-shaped regions extending longitudinally relative to the web and arranged laterally from each other, and the width and number of such heated strips can be selected as desired. That is, it is only necessary to provide and arrange the heat sources respectively.

It is particularly advantageous to use an infrared heater in the heating process, so a preferred embodiment according to the method of the invention is characterized by the use of at least one infrared heater as a heat source.

To eliminate the risk of burning the thermoplastic material, preheat the bottom face of the bottom covering web and the top face of the backing web prior to joining the two webs, and radiate the radiation of the at least one infrared heater before the two webs face each other. It is necessary to plasticize them immediately by directing them into the funnel space formed by the combination of. In this process, if the thermoplastics of the two webs passing through the device are heated from the cold state to the accidental state in a single location, there is no need to perform the heating with high energy when it is necessary to heat.

In order to obtain a product with particularly good stability it is necessary to be placed on the conveyor belt, preferably with the pile face upwards, before rolling the bonded web or otherwise handling it, a preferred embodiment of the method of the invention The two webs are cut into a predetermined width by cutting the edge strips with a knife along one or both longitudinal edges of the bonded web. Also, for example, by installing two rows of nails or needles in the conveyor belt that are arranged laterally apart from each other and that penetrate into the two webs and prevent them from shrinking laterally while the web cools, It is proposed to fix the edge to the conveyor belt. In general, however, the product should be allowed to contract freely.

By applying the method according to the invention there is no need to use adhesives or apply high voltages to bond the two webs. Artificial turf containing a tank can be produced. When using a backing web at least present on the surface of the thermoplastic material and having a V-shaped depression on the top surface of the backing web, and using a permeable bottoming web, a preferred embodiment of the method of the present invention is the backing of the bottoming web The recess is at least partially retained by adhering only the edges of the V-shaped recess to the coating. In fact, when water is sprayed on the artificial turf, the water passes through the upper web, but in part is retained in the V-shaped depression so that the evaporating water keeps the surface of the playground relatively cool.

The features, advantages and details of the invention will be apparent from the accompanying drawings and the specification of particularly advantageous embodiments of the process of the invention and of the final product obtained thereby.

FIG. 1 shows a portion of a turf web 10 that consists essentially of a fabric base carrier 12 and a pile ribbon 14 secured thereto and which can be used as a floor covering web. The base carrier 12 is, for example, a woven or knitted fabric of plastic material, while the pile 14 is made of thermoplastic material for convenience. In order to make the turf web permeable, the base carrier 12 is coated on the lower surface of the carrier with a so-called back coating 16 which is only partially achieved in an embodiment of the invention.

The portion of the backside web 20 shown in FIG. 2 forms, in a preferred embodiment, a node 26, such as a woven or knitted fabric of the core yarn 22 and a buffer protruding downwards, leaving the gap 28 empty. The coating 24.

Preferably, the back coating 16 and the coating 24 consist at least substantially of thermoplastic, in particular soft PVC.

In order to carry out a particularly preferred embodiment of the method of the invention, the device according to the invention shown in FIGS. 3 and 5 can rotate for a roll 34 of a turf web and a roll 36 of a back web. There are two carrier bars 30, 32, which are arranged to be adapted so that the two webs are withdrawn from the carrier bar. Initially, each web passes through a support roller 38 arranged in a horizontal plane so that the paths of the two webs are also horizontal, with the two surfaces glued together facing upwards. There the two webs are arranged to rotate like feed rollers 30 but are led to two cooling rollers 40 which are driven in opposite directions and cooled by means not shown. The cooling rollers are arranged with each other at a distance such that the two webs are brought into contact with the surface and adhered under slight pressure.

As best understood in FIG. 4, the infrared heater 44 is arranged above and over the turf web 10 and the back web 20 before passing through the cooling roller 40 and the infrared heater 44. ) Preheats the back cover 16 of the turf web and the cover 24 of the back web. The infrared heater consists essentially of a housing 50 with a heating rod 46 and a concave reflector 49, mounted over the entire width of each web 10 or 20 and the focus of each infrared heater. Lines 52 are designed and arranged to be located in the plane of the bottom surface of each turf web or the top surface of back web 20.

When the two webs 10, 20 travel around the cooling roller 40, they form a funnel space 54 which opens upwards before contacting, and the infrared heater 56 is the funnel space described above ( 54) arranged above. The latter infrared heater is in principle the same design as the infrared heater 44, but since the focal line of the concave reflector is larger, the focal line 58 of the latter infrared heater 56 is located in the funnel space described above and the two webs. It is located at or immediately before the first contact.

According to the invention, the device is installed such that the speed of the two webs is in the range of 1 to 3 m / min, and the temperature at the position of the lower part of the infrared heater 44 and slightly away from the top of the two webs reaches about 300 ° C. . However, the temperature of the apex of the funnel space 54 and slightly apart above the contact line of the two webs is only about 130 to 150 ° C.

The above-mentioned temperatures at the feed rates of the two webs described above are sufficient to bring the back coating 16 and the PVC of the coating 24 at least on their surface to be glued together so that the two webs are joined to each other by the cooling roller 40. In this case, the web is bonded or bonded due to the condition of the PVC. According to the present invention, the cooling rollers prevent undesired deformation of the pile ribbon 14 of the web 10 and the nodes 26 of the back web 20 during the heating process of the method of the present invention.

The web passes through the turning roller 60, which is arranged to rotate away from the cooling roller 40, and then on a conveyor belt 62 made of wire mesh, with the turf web 10 facing upwards. In addition, the conveyor belt 62 is driven by means not shown in the state in which the web between the cooling roller 40 and the conveyor belt 62 is at least hardly tensioned in the longitudinal direction.

As best seen in FIG. 5, the conveyor belt 62 moves along the frame 64 with support rollers 66 arranged to rotate within the frame. The cutting device 68 is mounted on the conveyor belt 62 at a sufficient distance from the joining device bonding device in order to cut the longitudinal edge of the already cooled web and to impart the desired width to the web. The cutting device 68 is provided with a bridge 70 traversing the conveyor belt 62, the bridge being mounted on the frame 64 by means of non-exemplified means, each of the two sides of the web in the longitudinal direction. A blade or wedge-shaped contact shoe (Shoe) 74 is arranged in the region between the conveyor belt 62 and the web to lift the longitudinal edge of the web from the conveyor belt 62. The cutting device also has cutter discs 76 driven on both sides, which are driven by the electric motor 72, for cutting the longitudinal edges of the raised web. Before the web passes through the cutter disc, the web is pressed against the contact shoe 74 with the gripping roller 80. Two webs glued together are rolled up with a roll 84 behind the conveyor belt 62.

According to the present invention, the infrared heaters 44 and 56 can be replaced by microwave heating devices suitable in principle as heat sources for applying the back coating 16 and the coating 24, as long as chemical changes in the material can be avoided. .

FIG. 6 shows the final product with the same reference numerals as in FIGS. 1 and 2. However, as is evident in FIG. 6, the back web 20 has a V-shaped depression 100 on its surface, which flows the material at the edge of the nodal buffer region slightly over the fabric core (downstream). By applying the coating 24 on the fabric core of the back web 20 is formed by the present invention. Since only the edge portion 102 of the depression 100 protruding upwards in accordance with the present invention is glued to the turf web, the V-shaped depression 100 is almost maintained to be in a position to support the water leaking through the turf web. do.

Particularly preferred heat sources are the Herileus kidney irradiator SATURN 250 and medium wave modulus irradiator available on the market. Shorter heaters may be used instead of heat sources that traverse the full width of the web, and the heat sources are arranged in series to heat the funnel space 54, while in series with the direction of the web path to preheat the two webs. But you can use heaters that are staggered next to each other.

Claims (5)

There is a hole through which water passes and a hole 28 through which the water passes through the pile material 10 which is only partially covered with thermoplastic material 16 which forms a thermoplastic region between the holes. A method of bonding a backing web formed at least in part by a thermoplastic material that is reliably bonded to the pile material and forms a thermoplastic region between the holes, wherein the pile material and the backing web are simultaneously moved, and the pile material and the backing web are bonded. It was previously run to face each other to guide the lower surface of the pile material and the upper surface of the back web to be located on the same side, and the thermoplastic region on the lower surface of the pile material and the thermoplastic region on the upper surface of the back web at least one heating source. Plasticize at least partially, pressurize the pile material and the backing web together, and heat the thermoplastic region of the pile material If the heat-sealing to the plastic region bonded to the file material characterized in the partially bonded together so that the number of the file Sikkim material permeability of the web and. The funnel space of claim 1 wherein the lower surface of the pile material and the upper surface of the backing web are preheated prior to joining the two webs, and the irradiation of at least one energy irradiator is performed by joining the two webs when the two webs are joined. To plasticize them just before joining the two webs. The method of claim 1, wherein after pressing the webs together, the composite web is placed on a conveyor belt to cool. The method of claim 1, wherein the webs bonded to each other are cut to a predetermined width after cooling. The method of claim 2, wherein the focus from the energy irradiator is focused so that the focus is within the bottom portion of the funnel space.

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