FI108523B - A method of scraping away material which is in a plastic state and an arrangement for realizing the process - Google Patents

Description

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A method for scraping off material in a plastic state and a system for performing the method

The present invention relates to a method for scraping off excess material in a continuous process by feeding long strips and / or planar workpieces each provided with at least one coating of material in a plastic state. The invention also relates to a system for implementing the method.

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For example, in the production of good quality wood products, some of the surfaces are formed into floors and interior components, whereby imperfections in the surfaces have to be eliminated, such as glue joints, branches and knot holes and the like. It is to be assumed that in the production of so-called laminated wood, such as laminated parquet boards, some of the production may involve some form of repair.

A conventional way of removing irregularities from the surface involves manually placing some type of smoothing compound 20. Wood flour and / or color pigments are often blended into the screed mix to minimize variation in the final result. . wood. Shovel tool made of steel, *; wood, rubber, or the like, is generally used to apply the blend. Often, the handicap must be done in multiple directions to achieve a good result. Manual leveling is very time consuming and requires special handling of workpieces / j 'if surface irregularities occur; homogeneities. Individuals are very susceptible to these substances.

The smoothing can also be mechanized, and the mixing can be · ···, rolled, for example. In this case, however, it is difficult to re-use the extra leveling compound.

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An improvement to this is disclosed in SE 442 832. The article to be treated is moved along a web under a curtain cover. An extra powder is applied to the surface to be treated, whereupon the excess powder is removed with 5 scrapers. The powder remaining in the irregularities is subjected to temperature increase by irradiation or heat conduction until the melting point is reached. The molten material is then allowed to harden. A disadvantage of the process is that surface oscillation is often necessary to allow the powder to penetrate cracks and irregularities. The powder may exit if the frequency of vibration is incorrect. Repeat the powder fitting process as needed to completely fill the holes.

The present invention proposes a solution to the above problem. On the other hand, the invention comprises a method! for scraping off excess material in a continuous process by feeding a continuous and / or planar workpiece each provided with at least one surface of material in plastic form. The material 20 is scraped off in a direction transverse to the direction of movement of the workpiece, and the material is extruded in a direction opposite to the direction of movement mentioned above. Compression of the material is achieved by tapering and / or pressure.

The invention also encompasses a system for implementing a method according to which the workpieces are adapted to be conveyed forward and the plastic material is adapted to be fitted in a continuous process. The belt-like device is arranged above the workpiece surface, from which it is desired to scrape off the plastic material. The belt-like device is used in a direction transverse to, ··, the direction of motion of the workpiece and also forms an angle with the workpiece surface.

The method and system according to the invention allow the time consuming and expensive manual 3 'H s 2 3 smoothing to be avoided. Excess smoothing material can be reused. The smoothing can be performed in a simple way without having to expose the workpiece to vibration.

The features of the invention will be apparent from the following claims.

The invention will now be described in detail with reference to the accompanying drawings in which

Figure 1 is a schematic front view of an arrangement according to the present invention,

Fig. 2 shows a side view of the system of Fig. 1, Fig. 3 shows a side view of the holder system, belt-like device and workpiece during scraping.

15 Frame A is provided with feed belts B and bearing brackets C for belt holders. The workpiece 1, which is, for example, a laminated parquet board, is adapted to be fed along the feed path 2 towards the paper plane in Figure 1 (right to left in Figure 2). In this way, the workpiece 20 is forced to pass beneath the fitting roll 3, where the smoothing mix is arranged as described above. The fitting roller may be grooved so as to fit into the workpiece. . a certain number of parallel equalization mixes are agreed; queues. After passing the workpiece past the fitting roller 25, it is laterally mechanically and automatically moved from the feed path 2 to the feed path 4. The workpiece is then moved along the feed path 4 in a direction away from the plane of Fig. 1 (left to right in Fig. 2). The workpiece is then forced to bypass the belt-like device 5 which is driven and guided by rollers 6 mounted on either side of the two feed paths 2 and 4 in bearings C. The belt-like device is driven in a direction transverse to the direction of movement of the workpiece. The belt-like device 5 forms an angle with the surface of the workpiece 35; see. Figure 2. This angle is not shown 4! βt.23 in Figure 1. In order to obtain a good smoothing effect, the angle between the belt-like device and the workpiece is 2.5 to 60 °, and preferably 5 to 30 °. The belt material, belt thickness, belt speed, leveling material type, and 5 workpiece feed rate are adapted so that the excess plastic leveling material is connected to the belt around roll 6 closest to the leveling device and thereafter up to the scraper arrangement tely 9. According to one embodiment of the invention, the excess plastic leveling material is introduced into a second belt-like device therewith (not shown), which introduces excess leveling material into a scraper arrangement that returns excess material to the container.

Figure 3 shows how a press assembly 10 forces a belt-like device against a workpiece during scraping. The downward pressing arrangement 10 consists of a belt holding device 11, a pressing cylinder 12 and an associated piston rod 13 mounted on the downward pressing device of the belt 20. The compression cylinder 12 is located in a box-like holder 14, from which two guides 15 extend to guide the slide of the holding device 11. The holder was 14,. fixed to the support beam 16. The support beam 16 is * * 'secured between the bearing brackets C.

* 25 Workpieces are generally wood, especially oak and / or beech. The wood is roughly ground before the smoothing operation, after which it is varnished. Dust is blown off 2 ', brushed and / or sucked off. Workpieces! ; is fed at a rate of 6 to 70 m / min, preferably 25 to 30 30 m / min.

The viscosity of the plastic material is preferably 300,000 to 900,000 Cp. The plastic material is generally plastic-based, and preferably ultraviolet-curable. Curing is accomplished most rapidly by exposing the smoothed workpieces 35 to UV light from the light source following the smoothing 5 '; ί H 523 in the working phase (not shown in the figures). The curing speed and curing depth can be adjusted for a particular light source, for example by arranging different amounts of pigments in the plastic material.

5 The part of the belt-like device which does not form an angle to the workpiece surface is in contact with the workpiece. This is possible with a belt-like device made of a metal such as steel, la-fiber material, ceramic material or the like, having a thickness of 0.25 to 4.5 mm, and preferably 0.8 mm, which is elastic flexibility. The belt advancing speed, i.e. the material scraping speed, is 3 to 90 m / min, and preferably 20 to 25 m / min.

Effective filling of the cavities is achieved by the fact that the material 5 required by the belt 5 for smoothing mixing, in addition to being displaced in the longitudinal direction of the workpiece, also has a lateral movement in the form of smoothing movement transverse to the working direction. The arrangement according to the invention enables the scraping of over 20 plastic materials in an elegant manner according to the invention from continuous and / or planar workpieces, each workpiece being provided with at least one plastic material adaptation layer; the public. This is done automatically and in a continuous process, making sure that the workpiece once exported

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A: past the belt-like device 5, with the excess plastic material removed, does not need to be passed a second time to allow the cavities to be completely filled, nor does it need to be removed from it a second time. Manual finishing of the smoothing can also be avoided, and excess plastic smoothing material can be returned to the process and complicated vibration can be eliminated. Because the screed is used effectively and quantitatively, a relatively expensive screed can also be used.

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The invention is not limited to the disclosed embodiment, but the following claims define the protection. For example, the adjusting roller 3 and the belt-like device 5 can be mounted on the same feeder path, it is also possible to combine both belt-like devices, whereby it is advantageous to adjust the optimum filling at a certain angle to the workpiece and another angle for scraping. The belt-like device may also be arranged such that the propagation direction of the workpiece 10 and the path of the belt-like device 5 form an angle other than 90 °, as in the example.

Claims (10)

7 ί n r s 9 λ • · U «L. O A method for scraping off excess material and smoothing workpieces (1, 1 ') in a continuous 5 process by feeding workpieces (1, 1') of long strip and / or flat shape, each provided with at least one material coating in a plastic state where the material is is scraped off in a direction transverse to the direction of movement of the workpieces 10 (1, 1 '), and the material is pressed in a direction opposite to the above direction of movement, whereby the material is also compressed by against the effect of a surface arranged in the direction, characterized in that most of the surface! forms a sharp angle with the surface of the workpiece (1, 1 ') to provide a tapering effect and the smallest portions of the surface do not form an angle with the surface 20 of the workpiece (1, 1'), thus being in contact with the workpiece; Method according to claim 1, characterized in that the workpieces (1, 1 ') are transported i .... s | · · At 25-30 m / min. Method according to one of the preceding claims, characterized in that the material is scraped off at a speed of 20 to 25 m / min. »* · · Arrangement for carrying out the method of any one of the preceding claims, wherein the workpieces (1, 1 ') are. 30 arranged so that they are conveyed forward and * »the plastic material is adapted to be fitted in a continuous ·; * 'process in which a belt-like device (5) is arranged above the surface of the workpiece (1, 1') from which the plastic material is to be scraped. ), for scraping. 35 on a surface used in a direction transverse to the direction of movement of the 1 · 8523 8 workpiece (1, 1 '), wherein the belt holding device (11) holds a belt-like device (5), characterized in that the belt-like device (5) angle with the surface of the workpiece (1, 1 '), and that the same belted device (5) is elastically resilient and held by the belt holder device (11) such that the belted device band closest to the workpiece (1, 1') (1, 1 ') to the surface whereby the portion of the belt-like device (5) not forming an acute angle with the surface of the workpiece (1, 1') is | in contact with the workpiece (1, 1 ') because the belt holding device (11), the clamping cylinder (12), and the piston rod (13) together force the belt-like device (5) against the workpiece (1, 1'). Arrangement according to Claim 4, characterized in that the angle between the belt-like device (5) and the surface of the workpiece (1, 1 ') is 5 to 30 °. Arrangement according to Claim 4 or 5, characterized in that it has two rollers (6) located on either side of the at least one web (2) feeding the workpieces (1, 1 ') forward to drive the belt-like device (5) and controlling. Arrangement according to one of Claims 4 to 6, characterized in that the belt-like device (5) is made of metal, such as steel, ··· glass fiber material, ceramic material or the like. The process according to any one of claims 4 to 7. 30 arrangement, characterized in that the belt-like device (5) has a thickness of 0.8 mm. ·; * '9. The arrangement according to any one of claims 4 to 8, characterized in that it has a *; ··· scraper arrangement (7) which removes the blade. 35 additional plastic material with it: from the transportable belt-like device (5) and return the material to the fitting arrangement or the like. Arrangement according to one of Claims 4 to 9, characterized in that the movement direction of the work piece (1, 1 ') and the movement path of the belt-like device (5) form an angle deviating from 90 °. | j, m • a · • a • · a · »· · ta I · 1 4» • III · • t · t * * • »a • aa a • ta ata · 'i Η κ 2 ^ ίο - ---