DE2554239A1 - Extrusion-coating an extruded plastics profiled blank - by coating it before final profiling and then shaping the semi-finished prod. into intended profile - Google Patents

Abstract

The core profile may be embedded in the coating either centrically or noncentrically. The thickness of the coating or that of the core may be controlled by varrying the output of coating or core material. Two or more coatings may be applied. High-precision laminated extruded profiles for a wide range of applications may be mfd. from dissimilar component materials, their nature depending on the intended use. Multi-layer laminates can be mfd. with the aid of extrusion equipment normally used for mfr. of simple profiles.

Description

Process and device for sheathing an extruded core

Plastic profiles The subject matter of the invention relates to a method for sheathing with a plastic made by extrusion Profiles made of plastic and on a device for carrying out the process, those with an extruder with a hollow mandrel for extrusion of the core profile and a further extruder for the extrusion of the jacket material and a jar profile tool for the sheathed core profile is equipped.

A multilayer structure of extruded plastic profiles allows the more targeted use of high-quality plastics. The use of high quality Plastics are limited to those profile zones that depend on the respective application require the use of such plastics. So could plastic profiles in the area The wear layer and, in the core, the intended use can be appropriately adapted.

The production of sheathed or lined plastic profiles requires according to the current state of the art for each profile shape and profile size separately manufactured extrusion tools.

The invention is based on the object of a method and a device to create with which it is possible to create single-layer or multi-layer profiles using the same principle to extrude using the for single-layer Profiles using profile tools. In addition, there is the task of the cladding profile to extrude without, UL to obtain the most even material flow possible and moreover simple Influencing both the material flow as well as the achievable cross-sections of KeflWrofil and jacket profile.

According to the invention it is provided that the core profile after extrusion sheathed before the final profiling. and then the sheathed core profile is deformed to the desired profile cross-section. This makes it possible to use the sheathing or lining of the plastic core p # - ofiles over a between the for single-sighted Profiles usual extrusion tool and the extruder of the core material interposed Coating tool that is fed by the cladding material so that the Core profile is sheathed before the final profiling. Here it is in further training the invention possible, the core profile centrally or eccentrically in the jacket to embed. Two or more coating layers can also be applied. According to the method according to the invention, it is possible to determine the wall thickness of the jacket or the strength of the core profile by changing the output quantity in the unit of time to vary the extruded shell or core material.

The device for performing the method is according to the invention designed so that the coating tool for the jacket annularly around the hollow The mandrel of the core profile is arranged with the lateral supply of the Nanteimaterials and the profile tool is set in front of the coating tool in the extrusion direction is. The coating tool for seamless extrusion is particularly advantageous a tubular casing with an annular distribution channel and an annular Dam with the same length at all points, but different across the cross-section Height trained. It is possible to distribute the jacket material evenly so that that seamlessly the trm cladding hose-shaped or tubular on the core profile can be extruded.

It is also provided that the cross-section of the dam is more eccentric by. radial adjustment variable annular gap is formed. With that, the Distribution of the sheathing material over the scope of the core profile adjusted and corrected.

The invention is shown in the drawing using exemplary embodiments novh explained in more detail. FIG. 1 shows schematically an extrusion system for production multilayer profiles, Figure-2 a cross section through the extrusion tool with coating tool and profile tool, Figure 3, 4, cross-sections through the Sheathed core profile in front of the 5, 9 and 13 profiling and Figures 6 - 8 from the wrapped Core profile according to Figure 5 profiliest profile, Figure 10 - from the sheathed core profile according to Figure 9 produced profiles and Figure 14 - from the sheathed core profile profiles produced according to FIG. 13.

In the figure 1 an extrusion plant is shown schematically, the core material 9 for the core profile being extruded with the extruder 45, the jacket material 1 is extruded with the extruder 47, these two to the coating tool 50 are supplied to that the profile tool 46 connects.

In FIG. 2, the cross-sectional coating tool is shown in cross section 50 shown, with the profile tool 46. The core material 9 is centrally in the Tool 50 inserted through the bore 44 in the mandrel 3 and at the end in the annular Mouthpiece 7 coated with the sheathing material 1 in a ring shape. In the ring-shaped Nundstück 7 are therefore core material and nantel material 1 already to form a solid rod connected to the Ker @ profile and the jacket 10. The one emerging from the mouthpiece 7 Solid bar 90, 10 becomes the desired one in the downstream profile tool 46 profile 901, 101 shaped.

The coating tool 50 consists essentially of the mandrel S, which is arranged in the length 13 with the bore 44 through which the core material 9 flows in The mandrel is surrounded by the tool housing at a distance, so that a Space for flowing through and distributing the jacket material 1 is formed.

The tool housing is divided into the housing flange 14, which is attached to the mandrel 3 is fastened in the threaded bores 34 by means of screws 33 (not shown) is. In an unspecified th recess of the housing flange 14 is the Channel limitation ring 26 by means of screws 27 (not shown) in the threaded hole 28 attached. This is followed by the Cehciusering F, which is not shown by means of Screws that rest in the recess 43 and pushed through the bore 39 Are, in the threaded hole 36 of the housing flange 14 is attached, the hole 35 is larger than the shaft diameter of the fastening screw, not shown, so that the housing ring 5 is radially displaceable. This radial adjustability of the housing ring 5 is carried out by means of adjusting screws, not shown, which by the threaded hole 17 in the housing flange 14 on the housing ring 5 at the point 16 act. Both for fastening the individual ring-shaped tool housing parts in the axial direction as well as for the radial adjustability of individual tool housing parts several fastening points are provided distributed over the circumference. At the housing ring 5 joins in the flow direction of the adjusting ring 8, which means Screws, not shown, which pass through the threaded hole 24 in the housing ring 5 act on him on the outside 23, is radially adjustable. The radial adjustability of the adjusting ring 8 is by means of the bolts 29, the unspecified recesses the adjacent tool housing parts protrude, limited. The definition in axial Direction of the adjusting ring 8 takes place by means of screws not shown in detail, which the adjoining annular mouthpiece 7 through the bore 39 in the threaded bore 37 of the housing ring 5 attached gene. Here, the bore 38 is in the collar 8 also in Diameter larger than the shaft of the not shown Be festigungsschrar so dfl% ß the radial adjustability of the adjusting ring 8 is possible is. The mouthpiece 7 is also radially by means of the threaded bore 40 of the housing ring 5 angular screws adjustable.

The llantel material 1 is fed laterally via the feed device 12 through which is located in the housing flange 14 # Ineten feed channel 15 for the tool 5C supplied. The task of the tool is now to make this material flow 1 ring-shaped as uniformly as possible according to the cross-section of the jacket to be extruded to distribute. For this purpose, the annular distributor channel closes at the supply channel 15 2, which merges into the dam 4 via the flow channel 32, is at the end of the dam 4 the compensating channel 41 is formed, to which the connecting channel 42 to the outlet channel 30 connects. The annular distribution channel 2 and the flow channel 32 are between the mandrel 3 and the housing flange 14 or the channel delimitation ring 26, the dam 4 and the compensation channel 41 are between the mandrel 3 and the housing ring 5, the connection channel 42 is between the mandrel 3 and the adjusting ring 8 formed and the exit gap 30 between the core profile 90 and the annular Mouthpiece 7.

The laterally fed jacket material 1 comes into the ring-shaped Manifold 2 and then enters the actual annular between the mandrel 3 and the housing ring 5 formed dam 4 a. The mouthpiece is then the dam 4 7 downstream by the tubular extrusion material leaving the dam 4 1 is connected to the core material 9. The whole tool 50 works seamlessly and thus avoids all of the disadvantages associated with the arrangement of spacers occur within the material flow and when it is subdivided.

The core material 9 coming from the extruder di5, which is used as a basic rod (solid rod) is extruded, is in the coating tool 50 with the sheathing material 1 of the extruder 47 is encapsulated in a ring shape. For overmolding the core material 9 with the jacket material 1 is the jacket material 1 coming from the extruder 47 in an annular distribution channel 2 surrounding the core material 9. the end This distribution channel 2, the jacket material 1 occurs via an intermediate Vorleufrinne 32 in the eccentrically arranged dam designed as an annular gap 4. This dam 4 formed between the housing ring 5 and the mandrel 3 is in the extrusion direction The same length over the entire circumference. The distribution channel 2 is designed so that due to the predetermined annular gap height of the dam 4, a uniform flow of material at the end of the dam 4 is guaranteed. To correct the flow, move it radially of the housing ring 5, the Ringapalthöhe of the dam 4 over the entire circumference of the Dam 5 can be changed. For manufacturing and procedural reasons proposed in the annular arrangement of the distribution channel 2 and the dam 4, to form the dam 4 in the same length but at different heights over the circumference.

After leaving the dam 4 via the compensation channel 41, which is on End leads to a constant annular gap cross-section with constant height occurs the jacket material via the connecting channel 42, which is also made by radial adjustment of the adjusting ring 8 is adjustable, in the annular mouthpiece 7, at the same time with the core material 9. The one remaining between the core material 9 and the mouthpiece 7 Gap 30 determines the jacket thickness 10. At the exit from the mouthpiece 7, a Solid bar with the core profile 90 and the jacket 10 received.

This two-layer solid rod can be centered according to Figure 3 with the two layers 90, 10 or eccentrically as shown in Figure 4, be formed. The solid rod 90, 10 then enters the profile tool 46 that is attached to the mouthpiece 7 is attached by means of screws, not shown. In the profile tool 46 the deformation of the sheathed solid rod 90, 10 takes place in such a way that the jacket of the solid rod without breaking through the identification material 90 through the jacket material 10 the contours of the profile tool 46 assumes.

In order to achieve a targeted distribution of the jacket material 1 depending on the! desired To enable profile, the distribution of the jacket material 1 over the circumference of the core profile 90 in the coating tool 50 by radial displacement of the housing ring 5 centric (see Figure 3) or eccentric (see Figure 4) e.n «-can be set. In the event of extreme displacement of the housing ring 5, the also radially displaceable Steliring 8 corrects the flow of material between the dam 4 and the core profile 90 will. Such a correction is particularly important for thermally sensitive materials, such as rigid PVC, an advantage. The eccentric setting (according to Figure 4) allows furthermore a local reinforcement of the jacket 10 or of the core profile 90.

A uniform change in the wall thickness of the jacket 10 or the Core 90 according to, for example, Figures 5 and 9 can once by a corresponding design of the coating tool 50 and on the other hand by change the ejection of the core or cladding material in the unit of time with the extruders 45 and 47 can be achieved. The increase in the output of the extruder 45 or the Reducing the output of the jacketed extruder 47, as shown in FIG. to a decrease in the casing wall thickness.

Pipe tools, for example, can be used as profile tools 46, see the profiles according to Figures 7, 11, 15 or other Ho1, llprofilarerkzeuge, see profiles of the 6, 10 or 14 or tubes as in FIGS. 8, 12 and 16 can be provided. In Figures 5 to 16, the influence of the core-shell material thicknesses and arrangement shown in the solid bar 90, 10 on the core-shell arrangement of various finished profiles.

Figure 5 shows the cross section of the solid rod 90, 10 in the middle Kernlaue 90. The material: (= classification 1 coat 40 is either given by a greener Bur-hsctz of the jacketed extruder 47 or by a throughput reduction in the core extruder 45 reached. Are in the cross section shown in Figure 5 of Solid bar 90, 10 different profile tools 46 downstream of the coating tool 50, for example, a hollow profile with a web results in the material shown in Figure 6 distribution. When using a handrail profile tool with the cross-section figure 7, an accumulation of material occurs in the jacket 101 of the finished product. The sheath or lining of a pipe profile according to Figure 8 when setting a full bar cross Section according to FIG. 5 leads to a thick jacket layer 101 in the case of a thin one Core layer 901.

FIG. 9 shows the cross section of the solid rod 90, 10 with no central position. When the full rod cross-section is set according to FIG. 9, the coating tool 50 a, ohlproSil tool with webs connected downstreamf that results in the figure in FIG 10 material distribution shown. FIG. 11 i shows the same solid bar cross-section corresponding to FIG. 9 a handrail profile and FIG. 12 a tubular profile. In comparison of FIGS. 6 and 10, 7 and 11 or 8 and 12 can be seen, ie with the same F, extrusion and coating tools with different settings different End profiles with different layer thicknesses can be produced.

The position of the core 90 according to FIG. 13 is due to radial displacement of the housing ring 5 has been set eccentrically. The influence of the eccentric arranged core 90 on the material distribution in the finished profile is shown in FIG 14 for a hollow profile with a web, in FIG. 15 for a handrail profile and in FIG 16 shown for a pipe profile.

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Claims (7)

Claims. 0 method to usmantste with a plastic by extrusion profiles made of plastic, d a d u r c h e k e n n z e i c h n e t that the core profile is sheathed after extrusion before the final profiling and then the sheathed core profile is deformed to the desired profile cross-section will. 2. The method according to claim 1, characterized in that the core profile is embedded centrally or eccentrically in the jacket. 3. The method according to claim 1 or 2, characterized in that the wall thickness of the jacket or the thickness of the core profile by changing the Output quantity in the unit of time of the extruded shell or core material varies will. 4. The method according to any one of claims 1 to 3, characterized in that that two or more jackets are applied. 5. Device for performing the method according to one of the claims 1 to 4, with an extruder with a hollow mandrel for extrusion of the core profile and a further extruder for extrusion of the jacket material and a profile tool for the sheathed core profile, characterized in that the coating tool for the jacket in a ring around the hollow mandrel of the core profile with side feed of the jacket material is arranged and the profile tool in the extrusion direction is placed in front of the coating tool. 6. Device according to claim 5J, characterized in that the coating tool for the seamless extrusion of a tubular casing with an annular one Manifold and an annular dam, the latter with at all Place of the same size but of different heights across the cross-section. 7. Apparatus according to claim 6, characterized in that the cross section of the dam is designed as an eccentric annular gap that can be changed by radial adjustment is.