DE3543767A1 - Process and device for the continuous production of profiles filled with plastic foam - Google Patents

Abstract

In a process for the continuous production of profiles filled with plastic foam, first of all a closed profile sleeve is extruded in one piece. Subsequently the horizontally guided profile sleeve is cut open in the region of its upper longitudinal edge. A foam-forming plastic material is filled into the gap formed and the profile sleeve is subsequently closed. The filling of the foam-forming plastic material takes place before the complete hardening or cooling of the extruded profile sections.

Description

The invention relates to a method for continuous

Production of profiles foamed with plastic, whereby in the a horizontally guided profile shell open along an upper filling gap foam-forming plastic material and then closed the profile cover will.

Such a method is for example from DE-OS 33 05 677 known for the production of foam-insulated roller shutter profiles. Thereby one prefabricated metal shell and a prefabricated plastic shell of the profile in the area of their lower longitudinal edges continuously merged and with one another connected, whereupon the foam-forming plastic material is filled. Afterward the profile cavity is closed by pressing the two shells together, whereby Snap connection elements formed on the shells engage with one another and the keep both bowls closed. Finally, the top margins are the rolled up both shells by rolling to form a connecting claw to the Connection of the roller door profile with an adjacent roller door profile.

The invention is based on the object of a method of the above to simplify the type described and the inexpensive production of foam to enable insulated hollow profiles in a single continuous operation.

According to the invention, this object is achieved in that the profile casing extruded in one piece in the closed state and before the filling of the plastic material is separated to form the filling gap.

Especially when the profile cover is made entirely of plastic is, this simplifies the production of foamed hollow profiles considerable, so that these can be offered at a much lower price, than has been the case so far. An essential feature of the method according to the invention consists in that the profile shell is first extruded and in a closed form only immediately before filling the plastic material, i.e. after calibration is opened. This enables the continuously extruded profile strand to be withdrawn facilitated and the calibration of the profile shell made possible, so that ensured is that the solidified profile shell in the closed state the desired shape owns. The elasticity of the material used to make the profile shell is usually sufficient to open the profile cover a little Spread open and fill in the core material.

Even in those cases in which a longitudinal section of the profile sleeve, for example one side of a roller shutter profile made of metal and the other longitudinal section made of plastic exist, according to the invention, the method described at the beginning of the known Kind are considerably simplified in that the longitudinal section made of plastic is extruded onto the metal longitudinal section in such a way that the two longitudinal sections into one another along their lower and optionally also along their upper longitudinal edge grab by, for example, undercut on the metal longitudinal section Grooves are formed into which the extruded plastic material penetrates and included ensures a permanent connection of the two longitudinal sections. Since in this case the profile can be pulled off the metal longitudinal section, it is not absolutely necessary, the longitudinal section made of plastic to connect at both longitudinal edges first with the metal longitudinal section and only then to open the profile. However, this can also be expedient if necessary be.

The separation of the profile cover can be done in such a way that the Profile cover sawn open or along one extending in the longitudinal direction of the profile Breaking point is separated, this breaking point when extruding the Plastic profile is provided.

Subsequent processing of the profile shell is no longer necessary. You need after filling the foam-forming plastic in the profile cavity just close the profile cover, let the foam harden and remove Cut off profile sections of the desired length from the continuous profile strand.

The separation of the profile cover and the filling in of the foam-forming Plastic material takes place after the extruded material has solidified so far, that a permanent deformation when separating and spreading the profile shell is excluded is, however, expediently before the profile shell has completely solidified and cooled. This ensures that even a cold, relatively brittle and hard The material of the profile sleeve still has a certain elasticity and that the filling gap limiting longitudinal edges of the profile shell after filling the foam-forming Plastic material without effort and without the risk of damaging the profile cover can be squeezed.

The profile sleeve is preferably made in one piece with sealing strips extruded, which are arranged on the inside of the profile shell and with their mutually facing longitudinal edges related to the extrusion, the profile shell is separated along the connecting line of the two sealing strips. The sealing strips can be designed so that they overlap when the profile sleeve is closed. Are the sealing strips in the form of flat or slightly curved bars, after filling the core material, they can be glued or welded reconnected to each other. In a particularly preferred embodiment are the locking strips - viewed in cross section - claw-shaped or hook-shaped formed, wherein the one inner locking strip with its claw opening according to outside and the other outer sealing strip with its claw opening inwards.

When the profile cover is pressed together, these two locking strips then snap into place into each other with their claws. The engagement can thereby still be promoted be that parallel to the outer sealing strip and at a distance from it a guide web is formed for the inner closure strip, the guide surface of which so inclined to the outer sealing strip that when the profile sleeve is pressed together the two sealing strips forcibly come into engagement with one another.

Preferably, the outer sealing strip is also more rigid than that inner sealing strip formed. This has the advantage that the foaming Core material presses the inner sealing strip against the outer sealing strip and thus holds the two locking strips firmly in engagement with one another. For this it can also be useful if the core material applied to it Area of the inner sealing strip larger than the corresponding area of the outer Closing strip is. While in the embodiment known from DE-OS 33 05 677 the snap connection elements connecting the two profile halves pushed apart again by the pressure of the plastic foaming inside the profile can be guaranteed in the inventive training that the Locking strips are locked by the pressure of the foaming plastic. This is particularly important in those cases in which, as with the profile according to DE-OS 33 05 677 the two profile shells still protruding by rolling Edge areas are connected to one another. This interlocking can be strengthened be that in the presence of the above guide web this from Pressure of the foaming plastic acts on the inner sealing strip against the outer sealing strip presses and thus the two sealing strips firmly in Keeps engagement with each other.

Are the sealing strips only as overlapping flat or slightly If curved webs are formed, the profile casing is closed by gluing or welding the sealing strips. The above positively interlocking Closing strips can of course also be additionally glued or welded will.

If necessary, it can also be expedient to use the profile sleeve to close a C-shaped profile strip, which - viewed in cross section - engages over hook-shaped edge sections of the closure strips.

This offers the possibility of using the C-profile strip, for example to provide a sealing lip which is attached to the hollow profile in this way can be.

In all cases, on the inside of the profile cover and / or the closure strips undercut extensions or undercut depressions be designed so that the profile sleeve and the foam core also form-fit be connected to each other. This creates an interlocking between the core material and the profile shell.

The invention also relates to an apparatus for continuous Production of profiles foamed with plastic, which - in the withdrawal direction of the formed profile considered - the following units arranged one behind the other comprises: an extruder for extruding a closed hollow profile, a calibration device, a first separating device for opening the hollow profile along its upwards pointing longitudinal edge and for spreading the delimiting the opened filling gap Profile walls, a pull-off device for the profile shell, a filling device for Filling a foam-forming plastic material into the open profile casing, a Closing device and a second separating device for dividing the continuously generated profile. Should the profile be partly made of metal and partly of plastic exist, the extruder head must be modified accordingly to include a longitudinal section of the profile to an independently generated metal profile.

The filling device and / or the separating device can be parallel be arranged displaceably to the withdrawal direction of the profile, so that they are synchronous can run along with the moving profile strand.

The closing device preferably comprises parallel to the longitudinal direction of the profile arranged endless pressure belts, which the profile cover sections against each other press to for example, the snap locking strips in engagement to bring together or around the profile cover sections during gluing or by welding them together until a firm connection is established and the filler slot of the profile cover is closed.

Further features and advantages of the invention emerge from the following Description which, in conjunction with the accompanying drawings, illustrates the invention explained on the basis of exemplary embodiments. They show: FIG. 1 a schematic Side view of an apparatus according to the invention for continuous production of foamed hollow profiles, in particular plastic profiles, FIG. 2 is a schematic Top view of the device shown in FIG. 1, FIG. 3 shows a cross section through an extruded profile shell before the separation thereof, Fig. 4 one of the Fig. 3 corresponding section after the cutting and spreading of the profile sleeve, the filling device for the foam-forming plastic indicated schematically FIG. 5 shows a section corresponding to FIG. 3 through the finished foam-filled one Profile with a closed profile cover, FIGS. 6 to 9 of FIG. 3 corresponding partial sections through profile sleeves with different locking geometries, FIG. 10 shows a modified embodiment of the closure strip shown in FIG and FIG. 11 shows a cross section through a profile sleeve which is still open, half of which made of metal and half of plastic.

In Figs. 1 and 2, the withdrawal or passage direction of a profile strand 10 indicated by the arrow A. The following units are considered in direction A arranged one behind the other: an extruder 12 for extruding a closed profile shell 14 according to FIG. 3 or for extrusion of a half-shell 16 onto another in another way generated half-shell 18, both of which together form a profile shell 20 open at the top (Fig. 11); a calibration device 22 of conventional type for calibrating the extruded Profile or profile section; an air shower indicated schematically by arrows B. to cool the extruded profile; a schematically indicated first separating device 23 for severing the closed extruded profile sleeve 14; a belt or chain pull-off device 24 for drawing off the extruded profile; a filling device 26 for filling a foam-forming plastic compound in the open profile shell 14 with storage containers 28 for the starting components of the foam and one in FIG. 4 schematically indicated filling nozzle 30; a locking device 32 with at least two on both sides of the profile strand arranged pressure belts 34 (Fig. 2), the number that Shape and the exact Formation of the pressure bands from the shape depends on the profiles to be formed; an arrangement 36 for measuring and marking the finished profile strand; a so-called flying one that can be carried along with the profile strand Cut-off saw 38 for cutting off profile sections of a desired length and a Stacking device 40 for stacking the separated profile from sections.

3 to 5 is an example of a rod-shaped or rod-shaped Foamed hollow profile shown a roller shutter profile. It includes two along of the lower longitudinal edge of the profile, profile halves 44 and 46 that are integrally connected in one piece and has on the lower longitudinal edge 42 of the profile a connecting rail with a hook-shaped cross section 48, which is intended for engagement in a channel 50 of a neighboring profile 14, the longitudinal edge of the profile 14 opposite the connecting rail 48 is formed (Fig. 5). The side of the profile halves 44 and 46 and below from the lower longitudinal edge 42 of the profile is defined by two claw-shaped top Snap-lock strips 52 and 54, respectively, are limited. The freshly extruded profile is the snap closure strips 52 and 54 at the edges facing one another a narrow web or a material bridge 55 connected to one another, so that the extruded profile is initially closed. In this form it can be reliable deducted and calibrated. The material bridge 55 is after the calibration of the profile and, after this has solidified so far that it is in the further machining process can no longer lose its shape, severed in the first separating device 23. This can be done, for example, by means of a saw or, if the material bridge 55 is thin enough by means of a knife or wedge.

The snap-lock strips 52 and 54 grip when pressed together of the two profile halves 44 and 46 by means of the pressure belts 34 of the locking device 32 in a form-fitting manner, as shown in FIG. 5. In the in this The closed position shown in the figure is the snap closure strip 52 by a locking bar 56 on the profile half 46 prevented from moving away from the Snap locking strip 54 to be released again. In addition, this inner snap-fastening strip is used 52 by the foaming plastic 58, which after closing the profile cover 14 has filled the entire interior of the hollow profile, in the closed position held. For this purpose, it is useful if the outer snap-lock strip 54 is designed to be relatively stiff, while the one for the snapping together of the two Snap-lock strips 52 and 54 required elasticity, especially in the snap-lock strip 52 is present.

According to FIG. 6, the locking bar 56 can so far into the profile cavity be extended into it that they have a guide bar with oblique in the direction of the outer snap closure strip 54 inclined guide surface 60 forms. When squeezing the profile halves 44 and 46 is the inner snap-lock strip 52 by the Guide surface 60 brought into engagement with the outer snap-locking strip 54.

A corresponding elasticity of the locking bar 56 provided, This can be under the pressure of the foaming plastic material in the profile cavity also apply against the closed snap-lock strips 52 and 54 and these hold in the closed position.

7 and 8 show embodiments with sealing strips 62, 64 or 66, 68, which only overlap in the closed profile, however no elements for a form-fitting Have engagement. At the These sealing strips 62, 64 and 66, 68 are extruded along the profile their free edges are connected to one another by a material bridge, which is then converted into the first separating device 23 is separated. The sealing strips 62 and 64 or 66 and 68 are glued or glued to one another after the hollow profile has been closed welded. In the embodiment according to FIG. 7, the sealing strips 62, 64 slightly curved in cross section, while in the embodiment according to FIG. 8 are designed as flat webs.

In the embodiment according to FIGS. 9 and 10, the sealing strips are 70 and 72 - viewed in cross section - curved in the shape of a hook. When extrusion are the sealing strips in the area of their curved sections by a narrow material bridge connected to one another, which is separated in the first separating device 23. Of the The profile is closed by a C-profile-shaped closure strip 74, which after filling the foam-forming plastic material into the profile cavity pushed or pressed onto the hook-shaped curved closure strips 70 and 72 will. The resulting plastic foam causes the hook-shaped closure strips 70 and 72 on the one hand and the C-profile strip 74 on the other hand claw into one another. This type of closure is particularly suitable for those cases in which, for example another seal is to be placed in the channel 50. In this case, for example a sealing lip 76 (Fig. 10) can be arranged on the C-profile strip 74, either extruded in one piece with this C-profile strip or attached to it later.

In the case of the hollow profile shown in FIG. 11, the profile half is 18 for example made of aluminum and the profile halves6 made of plastic manufactured. The profile half 18 has a cross section at its lower end C-shaped groove 78 into which, when the profile half 16 is extruded, the plastic material penetrates so that the two halves 16 and 18 in the area of the lower longitudinal edge of the profile firmly related to each other. Regarding also in this embodiment with 52 and 54 designated snap closure strips and the locking strip 56 is reference is made to the explanations of the embodiment according to FIGS. 3 to 5.

In the embodiments according to FIGS. 3 to 5, 7, 8 and 11 are on the inside of the profile halves 44 and 46, the profile section 16 and the Closure strips 62, 64 or 66, 68 each undercut, approximately in cross-section T-shaped or arrow-shaped strips 80 are formed which form a positive interlocking connection between the profile cover and the foam core.

The following steps are involved in the production of the foamed profiles ab: The closed profile sleeve 14 produced by the extruder 12 is placed in the calibration device 22 calibrated and cooled by the air shower so that it is from the trigger 24 can be detected without the risk of permanent deformation of the profile strand consists. Immediately after the calibration device 22, the initially closed Profile casing in the first separating device 23 separated. Then it becomes in itself by the spreading of the profile resulting filler slot 82 between the sealing strips 52, 54 (Fig. 4) of the open profile sleeve 14 in the foaming station 26 through the nozzle 30 foaming agents Filled with plastic material. Immediately after When exiting the foaming station 26, the extruded profile arrives at the locking device 32, where the two profile halves 44 and 46 through the pressure belts 34 in the direction of the arrows C shown in Fig. 5 are pressed against each other until the snap-lock strips 52 and 54 interlock and thus close the profile sleeve 14. The pressure bands 34 press the profile halves 44 and 46 against each other until the foam core 58 has become solid in the profile and there is no longer any risk of the snap-locking strips 52 and 54 could separate from each other again.

The extruded profile is then measured, signed and labeled with the Cut-off saw 38 divided into profile sections of the desired length.

The process used to manufacture a profile with a profile cover 20 according to FIG. In runs in the same way with the exception that the profile half 16 is extruded onto the profile half 18 produced in another way.

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Claims (21)

Method and device for the continuous production of with Plastic foamed profiles Patent claims 1. Process for continuous Manufacture of profiles filled with plastic foam, with the horizontal guided, along an upper filling gap open profile shell a foam-forming Plastic material filled and the profile cover is then closed, thereby it is noted that the profile sleeve (14) is made in one piece in a closed State extruded and before filling the plastic material to form the Filling gap (82) is separated on. 2. The method according to claim 1, characterized in that g e k e n n -z e i c h n e t that the profile sleeve (14) to form the filling gap (82) in the longitudinal direction of the profile is sawed open. 3. The method according to claim 1, characterized in that g e k e n n -z e i c h n e t that the profile sleeve (14) to form the filling gap (82) on a in Profile longitudinal direction extending predetermined breaking point is separated. 4. The method according to any one of claims 1 to 3, characterized g e k e n n shows that the profile sleeve (14) is made in one piece with sealing strips (52, 54; 62, 64; 66, 68) is extruded on the inside of the profile sleeve (14) are arranged and with their longitudinal edges facing each other during the extrusion related, the profile sleeve (14) along the line connecting the two Closing strips (52, 54; 62, 64; 66, 68) is separated. 5. Process for the continuous production of foamed plastic Profiles, with the horizontally guided, along an upper filling gap first open profile shell filled with a foam-forming plastic material and the Profile cover is then closed and wherein a longitudinal section of the profile cover made of metal and another longitudinal section made of plastic, thereby g e k e n n z e i c h -n e t that the plastic longitudinal section (16) with its lower longitudinal edge to the lower longitudinal edge of the metal longitudinal section (18) is extruded in such a way that the two longitudinal sections (16, 18) one inside the other to grab. 6. The method according to any one of claims 1 to 5, characterized g e k e n It is noted that the filling of the foam-forming plastic material in the profile sleeve (14) before the complete solidification or cooling of the extruded Profile sections takes place. 7. The method according to any one of claims 1 to 6, characterized g e k e n n z e i c h n e t that the filling gap (82) of the profile sleeve (14) by gluing is closed. 8. The method according to any one of claims 1 to 6, characterized g e k e n n z e i c h n e t that the filling gap (82) of the profile sleeve (14) by welding is closed. 9. The method according to any one of claims 1 to 3, characterized g e k e n n e i c h n e t that the filling gap is closed by means of a round cord, the undercut formed in the profile casing along the filling gap is extruded. 10. The method according to any one of claims 1 to 3, characterized g e k e n N z e i c h n e t that the profile sleeve (14) by means of a C-profile-shaped bar (74) is closed, which - viewed in cross section - is hook-shaped Overlaps edge sections of the sealing strips (70, 72). 11. The method according to any one of claims 1 to 8, characterized g e k e n n z e i c h n e t that the profile sleeve (14) by interlocking positively Closure strips (52, 54) is closed. 12. Bar or rod-shaped profile with a closed profile cover and a foam core filling this at least partially, the profile casing at least partially made of plastic and at least one in the longitudinal direction of the profile having running dividing line, along which the adjoining shell sections connected to one another by sealing strips after the core material has been introduced are, characterized in that the closure strips (52, 54; 62, 64; 66, 68) are designed in the form of flat webs that extend from the inside of the profile shell (14) overlap each other in a protruding manner. 13. Profile according to claim 12, characterized in that g e k e n n z e i c h -n e t that the closure strips (52, 54) - viewed in cross section - claw-shaped or hook-shaped are formed, the one inner locking strip (52) with its claw opening to the outside and the other outer sealing strip (54) with its claw opening to shows inside. 14. Profile according to claim 13, characterized in that g e k e n n z e i c h -n e t that the outer sealing strip (54) is stiffer than the inner sealing strip (52) is trained. 15. Profile according to claim 13 or 14, characterized in that g e k e n n -z e i c h n e t that parallel to the outer sealing strip (54) and at a distance of this towards the profile interior a guide web (56) for the inner locking strip (52) is formed, the guide surface (60) of which faces the outer sealing strip (54) is inclined that when the profile sleeve (14) is pressed together, the two sealing strips (52, 54) forcibly engage with each other. 16. Profile according to one of claims 13 to 15, characterized in that g e k e n n z e i c h n e t that the surface acted upon by the filled core material of the inner sealing strip (52) larger than the corresponding area of the outer sealing strip (54) is. 17. Profile according to one of claims 12 to 16, characterized g e k e n n z e i c h n e t that the profile sleeve (14, 20) and / or the sealing strips (62, 64; 66, 68) extensions (80) or undercut extensions on their inside Have depressions. 18. Device for the continuous production of plastic foamed profiles, g e k e n n n -z e i h n e t by an extruder (12) for extruding a closed hollow profile (14), a calibration device (22), a first separating device (23) for opening the hollow profile (14) along its upward facing longitudinal edge, a cooling device (B) for the extruded profile shell (14), a withdrawal device (24) for the profile casing (14), a filling device (26) for filling a foam-forming plastic material into the open profile casing (14), a closing device (32) and a second separating device (38) for dividing of the continuously generated profile. 19. The device according to claim 18, characterized in that g e k e n n -z e i c h n e t that the filling device (26) and / or the second separating device (38) are parallel can be moved to the pull-off direction (A) of the profile. 20. Apparatus according to claim 18 or 19, characterized in that it is -k e n n z e i c h n e t that the closing device (32) is arranged parallel to the longitudinal direction of the profile endless pressure belts (34) for pressing the profile casing sections together. 21. Device according to one of claims 18 to 20, characterized g e k It is noted that the second separating device (38) is a stacking device (40) is subordinate for the profile sections.