DE10140450B4 - Method and device for coating a profile rail - Google Patents

Abstract

method for coating a surface (17) a profiled rail (2) including at least one of them adjacent end face (42) with a thermosetting plastic film (3) by means of a Hot melt adhesive (11), in which the hot melt adhesive (11) melted and is applied to the thermosetting plastic film (3), the at least the melting temperature of the hot melt adhesive (11) heated and over the area (17) the profile rail (2) protruding is pressed against this, and subsequently the over the area (17) the profile rail (2) projecting Section (44) of the thermosetting plastic film (3) against the face (42) pressed the rail (2) will, meanwhile the thermosetting plastic film (3) below the melting temperature of the hot melt adhesive (11) cooled and at least in the region of the end face (42) is shock-cooled.

Description

The The invention relates to a method for coating a surface of a Including rail their adjacent end faces, as well a device for carrying out this procedure.

Out practice is known profile rails with thermoplastic plastic to coat. The plastic film is up to the plasticizing temperature of the thermoplastic material heated so that they are in any way shapes and thus can be adapted to the shape of the rail. In order to can be an area the rail is coated very easily including its adjacent faces be, with the thermoplastic film also the angular transition between the area and the face the profile rail adapts perfectly. However, thermoplastic films have a low Abrasion resistance, so that so coated rails are limited use.

From the DE 42 39 336 A1 For example, a method and an apparatus for coating carrier material is known. In this case, a carrier material including its end faces is coated with a wood veneer. As an adhesive, a hot melt adhesive is used, which is melted by heating prior to pressing the veneer. Subsequently, the veneer is pressed against the end faces of the body to be coated, after which the carrier material passes through a cooling device.

From the DE 40 23 461 A1 is a process for coating in the continuous process of panels and strips with postformable laminates known. In this case, an unspecified coating material is coated with glue, in particular white glue, and pressed onto the carrier material to be coated. Subsequently, the coating material is subjected to a heat treatment so that edges of the body to be coated can be better reshaped.

From the DE 199 44 526 A1 An arrangement of pressure elements for bonding a band-shaped covering to a narrow surface of a plate element and a method for gluing is disclosed. In this case, a film is coated with a hot melt adhesive and then pressed against the body to be coated. A shoe presses the plastic film against the edge zones of the pressure surface. However, a special cooling of the coating material does not take place.

Of the Invention is based on the object, a method of the initially specify the type mentioned that a coating of a rail made possible by means of a plastic film with high abrasion resistance. Furthermore is meant to carry a device be specified in this method.

These Task is according to the invention with the Features of the claims 1 and 11 solved.

In the method according to claim 1, a surface of a rail including its adjacent end faces is coated with a thermosetting plastic film. Duroplastic plastic films have the particular advantage over thermoplastic films that they have a much higher abrasion resistance, which is for many applications, especially for floor transition profiles of crucial importance. The increased abrasion resistance of thermosetting plastics results from the typical cross-linked structure of the polymer for this class of polymers, which leads to high chemical as well as mechanical stability. In contrast, thermoplastics consist of uncrosslinked, long-chain molecules that are relatively weakly bound together. For this reason, thermoplastics can be very easily brought by heating in a plasticizing state or melted. For thermosetting plastics, however, this conversion into a plasticizing state is not possible because the temperatures required for this would be beyond the decomposition temperature of the plastic. Due to these special properties of thermosetting plastics, it is relatively difficult to coat a surface of a rail including its adjacent end faces with a thermosetting plastic film. In particular, the edged transition between the surface and the end face of the rail causes considerable problems, especially since the thermosetting plastic film on the narrow end face experience has found little support. The thermosetting plastic film is covered with a melted hot melt adhesive, which establishes the mechanical connection with the profile rail. It is important that the plastic film is heated at least to the melting temperature of the hot melt adhesive. It is conceivable that the plastic film is heated before and / or after the application of the molten hot melt adhesive. The thermosetting plastic used is preferably a melanin resin which has a decomposition temperature of about 180 ° C. As a hot melt adhesive, in particular a polyurethane adhesive has proven its melting temperature in the range of 130 ° C to 160 ° C. So that the thermosetting plastic on a temperature between 160 ° C and 180 ° C are heated, which requires a very accurate compliance with the process temperature. Optionally, it may be advantageous to slightly heat the profile rail as well in order to prevent too rapid dissipation of the heat from the thermosetting plastic film into the profile rail. The coated with the hot melt adhesive and heated thermosetting plastic film is then pressed against the surface of the rail to achieve a good mechanical connection with the rail. In this case, the thermosetting plastic film has a greater width than the surface to be coated of the rail, so that it projects beyond the surface of the rail. This protruding portion of the thermosetting plastic film is then pressed against the end face of the rail, wherein the thermosetting plastic film is bent around the edge between the surface and the end face of the rail. While the thermosetting plastic film is pressed against the end face of the rail, it is cooled below the melting temperature of the hot melt adhesive. Thus, the thermosetting plastic film is held at least as long at the end face of the rail until the hot melt adhesive reaches a sufficient adhesive effect to permanently hold the thermosetting plastic film on the end face of the rail.

Around a good hold of the thermosetting plastic film on the faces of the To ensure rail it is important that the duroplastic plastic film during of curing of the hot melt adhesive has no freedom of movement and flat the face the profile rail rests. This is easiest according to claim 2 achieved in that the over the area the profile rail protruding Section of thermosetting plastic film of flat adjacent Bake against the face pressed the rail becomes. These jaws are biased against each other to provide adequate contact pressure the thermosetting plastic film on the face of the To ensure profile rail. Unlike rolls results from the use of baking the advantage that the duroplastic plastic film over the entire surface of the end face of Rail is applied and not before and after each individual Lift the roller from the front surface can. This is to achieve a secure bond of considerable Importance.

The Profile rails are generally made of metal, preferably made of a light metal alloy, so that they have a correspondingly high Possess bending stiffness. These rails are therefore in Generally produced as so-called yard goods with a given length. Basically every one could single of these rails with the aid of the above method be coated with a thermosetting plastic film. Easier and easier especially cheaper is it still, if according to claim 3 the profiled rails in a row and consecutively with the thermosetting plastic film to be coated. Subsequently, the single rails slightly by cutting the thermoset Plastic film separated in the area between two profile rails become. Preferably, the rails are at a slight distance lined up in a row to the separation of the coated rails to facilitate.

Around a simple process control of the To ensure process it is according to claim 4 low, when the thermosetting plastic film by means of rollers against the area pressed the rail becomes. This is especially for a continuous coating low, as a result particularly simple construction of the coating device results. Press the rollers constantly against the rails, the rollers optionally also for Rotation can be driven. It does not matter if the area to be coated is the Rail even or slightly bent is, as guaranteed in each case, a sufficiently secure adhesive bond is. To make sure that Hot melt adhesive completely is melted, it is advantageous if the coated rail additionally is heated. This heating may take place before, during and / or after pressing thermosetting plastic film by means of the rollers, wherein the heating preferably against the coating side of the rail he follows.

Around one possible efficient heating of the plastic film or the rail to it is according to claim 5 advantageous to feed them with hot air. In order to results in a contactless heating the thermoset plastic film or the rail, wherein this still to a uniform temperature is brought. Furthermore must the coated rail then not of contact materials cleaned for temperature transfer become. To cool down the coated plastic film is preferred for the same reasons cooling air used.

According to claim 6 flows the cooling air against that portion of the thermosetting plastic film which is against the face the rail is pressed. This ensures a very efficient cooling of the thermosetting plastic film and the underlying hot melt adhesive in the critical area, so that the latter quickly becomes firm and reaches its maximum adhesive power.

In order to achieve a good adhesive effect of the thermosetting plastic film, in particular in the region of the end face of the rail, it is advantageous to first cool the plastic film. there In particular, it is important to shock-cool the thermosetting plastic film in that area which is pressed against the end face of the profile rail, since this area is particularly critical for the adhesive effect. In the course of this shock cooling of the hot melt adhesive is cooled below its melting temperature to ensure a sufficiently secure adhesive effect of the hot melt adhesive in the face region of the rail.

To the shock cooling the thermosetting plastic film according to claim 8 is subjected to a main cooling, the for a cool down of the hot melt adhesive until well below its melting temperature. Thus, the hot melt adhesive reaches its main cooling maximum strength and adhesion.

According to claim 9, it is advantageous if the shock cooling by means of cooling air a temperature of less than 5 ° C he follows. Preferably, the cooling air has a tempera ture of below 0 ° C, a sufficiently large one Shock effect on the thermosetting plastic film and the hotmelt adhesive exercise. The hot melt adhesive is in particular in the region of the end face of the Rail cooled to a temperature of preferably below 120 ° C, so that he in this area is certainly frozen. The main cooling can against it with higher Temperature of, for example, 10 ° C up to 30 ° C respectively. Because of this increased Temperature can be the main cooling economically with stronger Cooling air flow operated be an efficient cooling the thermoset plastic film and the hot melt adhesive guarantee.

Around the profile rail as possible to cool quickly to a temperature which allows easy handling, it is according to the claim 10 cheap, though subjected the rail after the main cooling another shock cooling becomes. In this is preferably cooling air at a temperature from below 5 ° against the rail is blown to the rest in the rail contained heat preferably quickly dissipate.

to execution of the above method, the device according to claim 11 proven, for pressing the thermosetting plastic film to the face of the Profile rail is used. The device comprises a shoe which is formed by resiliently against each other biased jaws. These Press baking the thermoset plastic film surface against the face of the Rail. By the resilient bias of the jaws against each other is an even pressure the bac ken against the face the rail ensures where manufacturing tolerances in the width of the rail as well easily balanced in the material thickness of the thermosetting plastic film become. To the thermosetting plastic film in particular in the field the face the rail during of pressing to cool these, is it cheap if the jaws outlet openings allocated for the cooling air are. Preferably, these outlet openings are arranged such that the cooling air directed to the edge region of the thermosetting plastic film is. This results in a particularly effective cooling of duroplastic plastic film and the hot melt adhesive in the critical Edge region.

Around a precise one Alignment of the rail to ensure the jaws of the shoe is the jaws according to claim 12 at least one investment table for assigned to the rail. This investment table can be the simplest Case have a sliding surface, on which the adjoining rail is transported. alternative However, it is also conceivable, the feed table of several rotatable rollers to form a gentle and low-friction transport of the Ensure profile rail. Preferably, one or more of these rollers are driven for rotation, to support the further transport of the rail.

For use in a continuous coating system are the Baking or the feed table according to claim 13 beveled at least in the casserole area of the profile rail or convex rounded. This ensures that the over the Profile rail protruding Sections of the thermosetting plastic by the bevel or Rounding gradually bent over and against the faces pressed the rail become.

According to claim 14, it is advantageous if the jaws, each with a feed table are connected, which are spaced from each other. To form this the jaws, each with a support table for the rail a fixed Building unit, so that the flow conditions for the cooling air in the transition area constant between the jaw and the feed table independent of the jaw distance stay. The outlet openings for the cooling air are in this case preferably in the transition region between the Jaw and the investment table provided. To get the necessary freedom of movement To ensure the jaws relative to each other, the investment tables from each other spaced.

Around the buckling load of the thermosetting plastic film in reasonable To hold limits, it is according to claim 15 advantageous when between the jaws and the investment table a rounded transition is provided. This is a sharp-edged bending of the thermoset Plastic film prevents, so the risk of breakage this Film is reduced accordingly.

The inventive method and the device according to the invention will be explained by way of example with reference to the drawing, without the scope of protection to restrict.

It shows:

1 a schematic representation of an apparatus for coating profile rails with a thermosetting plastic film,

2 a spatial representation of a part of the device according to 1 and

3 a sectional view through the device according to 2 at the section line III-III.

1 shows a schematic representation of a device 1 for continuous coating of profile rails 2 with a thermosetting plastic film 3 , in particular a melanin resin film. The thermosetting plastic film 3 is on a commercial role 4 wound and is a schematically indicated unwinding device 5 known type handled by this.

The thermosetting plastic film 3 becomes a memory 6 supplied by stationary supported rollers 7 and relative to these moving rollers 8th is formed. This store 6 especially when changing the role 4 important.

Once the role 4 is completely settled, the moving rollers 8th of the memory 6 towards the stationary rollers 7 shifted, so that for a certain time the thermosetting plastic film 3 from the store 6 is delivered. Once the vacant role 4 through a new role 4 replaced, are the thermosetting plastic films 3 connected together and then the thermosetting plastic film 3 from the new role 4 settled.

Subsequently, the moving rollers 8th of the memory 6 again from the stationary rollers 7 moved away to the store 6 with duroplastic plastic film 3 to fill. In this way is a continuous operation of the device 1 also when changing the role 4 possible.

The memory 6 is an order device 10 for a hot melt adhesive 11 downstream. In this order device 10 becomes the hot melt adhesive 11 melted by heating, the temperature of the hot melt adhesive 11 in the range between its melting temperature and the decomposition temperature of the thermosetting plastic film 3 lies. The applicator device 10 has a nozzle 12 on, for a uniform adhesive application on the thermosetting plastic film 3 provides. Due to the heating of the thermosetting plastic film 3 and the hot melt adhesive 11 above its melting temperature is the hot melt adhesive 11 liquid, what the further process control in the device 1 is important.

The profile rails 2 Be about one of roles 13 formed transport device 14 transported at a small mutual distance. It is sufficient that only some of the roles 13 are driven to rotate, while the rest are designed to run freely. Alternatively, it is also conceivable, all roles 13 to drive to the rotation. It is also conceivable, the rails 2 flush abutting transport, which, however, makes their subsequent separation difficult.

In the area of the transport device 14 is another heater 15 provided in the form of a hot air blower. This heater 15 ensures heating of the profile rails 2 to a temperature of about 30 ° C to 50 ° C. Due to this increased temperature of the profile rails 2 is too rapid cooling of the thermosetting plastic film 3 and the hot melt adhesive applied thereto 11 prevented.

The thermosetting plastic film 3 is about one of the not with the hot melt adhesive 11 coated side pulley 16 against a surface 17 pressed the rail. The pulley 16 is a hot air blower 18 upstream, whose nozzle 19 in the gap between the thermosetting plastic film 3 and the profile rail 2 is directed.

This hot air blower 18 blows air at a temperature of about 400 ° C against the thermosetting plastic film 3 so that it is at a temperature between the melting temperature of a hotmelt adhesive and the decomposition temperature of the thermosetting plastic film 3 is heated. Preferably, the thermosetting plastic film 3 from a melanin resin and the hot melt adhesive from a polyurethane adhesive. In this case, the heater will 9 adjusted so that the thermosetting plastic film 3 is heated to a temperature between 160 ° C and 180 ° C.

The guide roller 16 are press rolls 20 subordinate to the transport rollers 13 are oppressively supported. Preferably, the press rolls 20 resiliently biased to a constant contact pressure of the thermosetting plastic film 3 on the surface 17 the profile rail 2 to ensure. It is important that the shell contour of the press rolls 20 to the cross-sectional shape of the surface 17 the profile rail 2 is adapted. has the area 17 For example, a convex curvature, so the press rolls are considered concave in an axial section. The press rolls 20 is another hot air blower 21 downstream, which has a hot air flow at a temperature of about 400 ° C against the coated surface 17 the profile rail 2 blows.

The hot air blower 21 are three shoes 22 . 23 . 24 subordinate to the pressing of the thermosetting plastic film 3 at end faces of the profile rail 2 and for their cooling below the melting temperature of the hot melt adhesive 11 to care. The exact structure of these shoes 22 . 23 . 24 will be explained in detail below, so that for the time being only the decisive steps for the litigation will be discussed. In each of the shoes 22 . 23 . 24 becomes the thermosetting plastic film 3 against the end faces of the profile rail 2 pressed and cooled at the same time. The cooling takes place in each case by means of cooling air to the thermosetting plastic film 3 is streamed.

The first shoe 22 is applied with a cooling air of about -4 ° C to shock cooling of the thermosetting plastic film 3 to achieve. This ensures that the hot melt adhesive 11 in the area of the end faces of the profile rail 2 solidifies very quickly, so that it can achieve its adhesive effect as quickly as possible in this sensitive area. This is important in order to prevent the thermosetting plastic film 3 after leaving the shoe 22 from the end face of the profile rail 2 can solve. The shoe 22 ensures a cooling of the thermosetting plastic film in particular in the region of the end faces of the rail 2 to about 100 ° C.

The following shoe 23 is applied with a cooling air of about + 18 ° C, so that in terms of economic cooling over the shoe 23 results in much stronger air flow. This shoe 23 forms a main cooling stage, which is responsible for a cooling of the thermosetting plastic film 3 and the hot melt adhesive 11 to approx. 60 ° C. This main cooling stage thus ensures that the entire hot melt adhesive 11 cooled sufficiently deep, so that it unfolds its full adhesive power.

The shoe 23 is another shoe 24 downstream, which in turn is acted upon by a cooling air at a temperature of about -4 ° C. With this additional shock cooling is the thermosetting plastic film 3 cooled to below 40 ° C, so that the coated rail 2 easy to edit.

The shoe 24 is a cutting knife 25 downstream, that for separating the over the end face of the rail 2 protruding parts of the thermosetting plastic film 3 serves.

Finally, the over the thermosetting plastic film 3 contiguous profile rails 2 by a transverse separating device 26 separated. This separator 26 engages in gaps 27 between successive rails 2 one. Subsequently, the re-separated rails can 2 be stored, packed and optionally cut to length.

The shoes 22 . 23 . 24 are identical to each other and are based on the spatial representation according to 2 and the sectional view according to 3 explained in more detail. In these figures is the shoe 22 turned around to better recognize the individual parts.

The shoe 22 has a stationary frame 30 on, which is formed by a U-shaped bent sheet metal. In free thighs 31 of the frame 30 are tapped holes 32 provided in the screws 33 intervention.

These screws 33 each have a shaft 34 up into a hole 35 a block 36 intervenes. Between the block 36 and the thigh 31 of the frame 30 is a spring 37 provided the block 36 biased toward the frame center. This will be the blocks 36 through the springs 37 pressed against each other. The shafts 34 make up together with the hole 35 a guide for the block 36 , so that this only axially to the shaft 34 is movable.

In the blocks 36 are also more holes 38 provided, in which another shaft 39 engages both blocks 36 detected. This shaft 39 forms together with the holes 38 an additional guidance of the blocks 36 which could, however, possibly be waived. On the shaft 39 is another spring 39a held the two blocks 36 pushes apart. This spring 39a is weaker than the feathers 37 and ensures a tilting moment, which makes the blocks particularly effective against the end faces 42 the profile rail 2 suppressed.

The blocks 36 form an investment table 40 which conforms to the shape of the profile rail 2 is adapted. At this investment table 40 becomes the rail 2 guided smoothly. At this investment table 40 is each outside a jaw 41 held over the face 42 the profile rail 2 survives. This cheek 41 has chamfers at both ends 43 , by which a gradual flipping over the surface 17 the profile rail 2 protruding sections 44 the thermosetting plastic film 3 is effected. By the springy storage of the blocks 36 and with it the baking 41 become these overhanging sections 44 flat against the faces 42 the profile rail 2 pressed.

In the block 36 are outlet openings 45 in front Seen in a longitudinal direction to the shoe 22 running channel 46 lead. This channel 46 stands with hose connections 47 in connection, on which not shown hoses for blowing cooling air into the channels 46 are connected. This cooling air occurs at the outlet openings 45 out, in whose area depressions 45a are provided, which ensure a favorable distribution of the cooling air. The exiting cooling air is at the edge area between the surface 17 and the face 42 the profile rail 2 where they provide efficient cooling of the thermosetting plastic film 3 and the hot melt adhesive 11 results.

1

contraption

2

rail

3

thermoset art

stoffolie

4

role

5

unwinding

6

Storage

7

stationary role

8th

portable role

10

applicator

11

melt adhesive

12

jet

13

role

14

transport device

15

heater

16

idler pulley

17

Area of profile

rail

18

Heat Guns

19

jet

20

press roll

21

Heat Guns

22

shoe the shock

cool stage

23

shoe the main

cool stage

24

shoe the after

cool stage

25

cutting blade

26

separating device

27

gap

30

frame

31

free leg

32

threaded hole

33

screw

34

shaft

35

drilling

36

block

37

feather

38

drilling

39

shaft

40

feed table

41

jaw

42

face

43

bevel

44

protruding From

cut the duropla

stischen Kunststoffo

lie

45

outlet opening

45a

deepening

46

channel

47

hose connection

Claims (15)

Method for coating a surface ( 17 ) a profile rail ( 2 ) including at least one end face ( 42 ) with a thermosetting plastic film ( 3 ) by means of a hotmelt adhesive ( 11 ), in which the hot melt adhesive ( 11 ) and melted onto the thermosetting plastic film ( 3 ) is applied, which at least to the melting temperature of the hot melt adhesive ( 11 ) and over the surface ( 17 ) of the profile rail ( 2 ) is pressed against it, and then the over the surface ( 17 ) of the profile rail ( 2 ) projecting section ( 44 ) of the thermosetting plastic film ( 3 ) against the end face ( 42 ) of the profile rail ( 2 ), while the thermosetting plastic film ( 3 ) below the melting temperature of the hotmelt adhesive ( 11 ) cooled and at least in the area of the end face ( 42 ) is shock cooled. The method of claim 1, wherein the over the surface ( 17 ) of the profile rail ( 2 ) projecting section ( 44 ) of the thermosetting plastic film ( 3 ) of flat adjoining jaws ( 41 ) against the end face ( 42 ) of the profile rail ( 2 ) is pressed, which are biased against each other. Method according to Claim 1 or 2, in which the profiled rails ( 2 ) in a row, continuously with the thermosetting plastic film ( 3 ) and then by cutting the thermosetting plastic film between successive rails ( 2 ) are separated. Method according to at least one of claims 1 to 3, wherein the thermosetting plastic film ( 3 ) by means of press rolls ( 20 ) against the surface ( 17 ) of the profile rail ( 2 ) and the coated rail 2 is heated. Process according to at least one of Claims 1 to 4, in which the duroplastic plastic film ( 3 ) and / or the profile rail ( 2 ) is heated by means of hot air and / or cooled by means of cooling air. Method according to Claim 5, in which the cooling air at the end face ( 42 ) of the profile rail ( 2 ) pressed section ( 44 ) of the thermosetting plastic film ( 3 ) flows. Process according to at least one of Claims 1 to 6, in which the duroplastic plastic film ( 3 ) in to the surface ( 17 ) and face ( 42 ) of the profile rail ( 2 ) pressed position at least in the region of the end faces ( 42 ) of the profile rail ( 2 ) is shock-cooled, wherein the thermosetting plastic film ( 3 ) below the melting temperature of the hotmelt adhesive ( 11 ) is cooled. Process according to Claim 7, in which the thermosetting plastic film ( 3 ) is subjected to a main cooling after the shock cooling. The method of claim 7 or 8, wherein the shock cooling means cooling air with a temperature of less than 5 ° C and / or the main cooling takes place through a cooling air flow, the stronger as the cooling air flow the shock cooling is. Method according to at least one of claims 7 to 9, wherein the profile rail ( 2 ) is subjected after the main cooling another shock cooling. Device for carrying out the method according to at least one of claims 1 to 10, wherein the device comprises a shoe ( 22 . 23 . 24 ), of resiliently biased jaws ( 41 ) is formed, the surface against the faces ( 42 ) of the profile rail ( 2 ), characterized in that the jaws ( 41 ) Outlet openings ( 45 ) are assigned for the cooling air. Device according to claim 11, characterized in that the jaws ( 41 ) at least one investment table ( 40 ) for the profile rail ( 2 ) assigned. Device according to claim 11 or 12, characterized in that the jaws ( 41 ) and / or the feed table ( 40 ) at least in the casserole area of the rail ( 2 ) Bevels ( 43 ) and / or convex curved portions. Device according to claim 13, characterized in that the jaws ( 41 ) each with a feed table ( 40 ) are connected and spaced from each other. Apparatus according to claim 13 or 14, characterized in that between the jaws ( 41 ) and the feed table ( 40 ) a rounded transition is provided.