HUE026839T2 - Metallic mesh semi-worked piece, and method for the realization thereof - Google Patents

Description

Description [0001] The present invention relates to a semi-worked piece based on a so-called "metallic mesh" (or more generally a structure of the "textile" type formed with metal elements consisting of suitably combined weft and warp wires), as well as to the method of manufacturing it.

[0002] It is known that working of woven objects based on metal materials involves some technological expedients, exactly in connection with the particular nature of the material that is submitted to these working operations; as a compensation for the difficulty in working some metal materials, the resultant "woven" products have mechanical and/or operating capabilities that can be hardly repeated using other types of materials.

[0003] On the other hand, textile semi-worked products of (threadlike) metal materials have a wide application in a great number of technical fields; for instance, these metallic meshes are used for reinforcing otherwise yielding structures, or as individual-protection elements such as garments or shoes (and so on).

[0004] As a particular example of what hereabove generally stated, reference can be made to the machinery for working polymeric materials, where mesh-like filtering elements can be often found; usually, these filtering elements consist of woven materials made of annealed low-carbon steel.

[0005] These filtering elements are impinged on by the flow of plastic material that is worked by the machinery and therefore must bear important stresses and pressures, or at all events must tackle with very particular work conditions, due to the nature and/or aggregation state of the polymeric material itself (in a granular, powdery, fluid or multi-phase condition).

[0006] The filtering elements of known type are generally characterised by some important drawbacks and mainly sufFer for a limited operating life, high tendency to geometric and mechanical decay, inconstancy of the filtering power over time and necessity of frequent interventions for replacement and servicing.

[0007] Therefore, the metallic-mesh semi-worked products of known type cannot be always planned and (above all) made in such a manner as to satisfy particular design requirements, since certain interknitting typologies of the semi-worked piece (and in particular for some mesh densities) associated with predetermined strength features of the metal wires are actually incompatible.

[0008] In other words, use of metal wires with high mechanical performance makes manufacture of particularly close metal meshes/wire cloths very difficult and almost impossible, since the high metal strength of the wires makes them of difficult interweaving.

[0009] A metallic-mesh semi-worked piece according to the preamble of claim 1 is known from US 2007/0235595 A1.

[0010] In the light of the known art discussed above, it is an aim of the present invention to make a metallic-mesh semi-worked piece as well as to provide a method of producing this semi-worked piece that are capable of obviating the above mentioned drawbacks.

[0011] In particular, the present invention aims at conceiving a metallic-mesh semi-worked piece that simultaneously can have satisfactory mechanical-geometric strength and coherence and can be woven following particular weft and yarn patterns.

[0012] At the same time, the present invention aims at conceiving a metallic-mesh semi-worked piece that can be used as a filtering element in machinery for processing plastic materials and can therein offer high operating performance both in terms of filtering capability and constant yield as well as useful operating life.

[0013] In addition, the present invention aims at making available a metallic-mesh semi-worked piece (and the related production method) enabling the production costs to be greatly reduced and the environmental impact to be improved where possible, while at the same time being exploitable in a wide range of variants.

[0014] The foregoing and further aims are achieved by a metallic-mesh semi-worked piece and a method of obtaining this semi-worked piece, in accordance with the present invention, having the features illustrated in the appended claims and described hereinafter in an embodiment thereof given by way of non-limiting example and with reference to the accompanying drawings, in which:

Fig. 1 is a diagrammatic view of the semi-worked piece according to the invention;

Fig. 2 is an enlarged view of part of the semi-worked piece seen in Fig. 1 ; and

Figs. 3 and 4 show two possible alternative embodiments of the semi-worked piece according to the invention.

[0015] With reference to the drawings, the metallic-mesh semi-worked piece according to the invention is generally denoted by reference numeral 1 and it can be conveniently used as the filtering element in machines for filtering of the molten mass in recycling of polymeric/plastic materials (extruders, feeding hoppers, moulds and others, for example).

[0016] From a structural point of view, the semi-worked piece 1 comprises a weft 2, defined by a multiplicity of primary threadlike elements 2a made of metal material, and a warp 3 interlaced with the weft 2 and in turn defined by a multiplicity of secondary threadlike elements 3a; advantageously, and unlike the filtering elements of known type, at least one of the primary and/or secondary threadlike elements 2a and/or 3a consists of high-carbon steel.

[0017] Within the scope of the present invention, it is therefore possible that part of the warp and/or weft wires will be made of the above mentioned particular material (high-carbon steel), which has a very high tensile strength and therefore gives the semi-worked product particular behavioural features.

[0018] Within the scope of the present invention, it is also possible to notice that the expression "part of the warp and/or weft wires" can mean either that the semi-worked piece comprises "individual" high-carbon wires disposed randomly, or that the semi-worked piece comprises high-carbon wires disposed in a predetermined "sequence" (i.e. a high-carbon wire every N wires made of another material); at all events, the mesh density of the present semi-worked piece can be typically included within the values detailed in the following.

[0019] In particular, use of threadlike elements made of high-carbon steel allows creation of a filtering element which can be mounted on machines for plastic material and/or polymeric material processing, and offers a high filtering power (or more generally, offers the possibility of suitably varying the filtering power by an appropriate pre-selection of the mesh density) and at the same time enables a high planar character to be maintained, as well as a mechanical strength and a prolonged filtering constancy even when said filtering element is submitted to plastic/polymeric material flows that are particularly intense or have a high viscosity.

[0020] To the aims of the present invention, and in particular for making semi-worked products having mechanical properties that are widely differentiated from each other depending on the final uses, it is conveniently possible that only part of a single wire or a fraction of the overall wires used will be made of high-carbon steel (for instance, high carbon steel can be only used on the semi-worked piece edges, while far from the edges, wires of different material can form the weft and warp wires, such as low-carbon steel for example).

[0021] It is also to be noted that within the scope of the present invention a metallic-mesh semi-worked piece is wished to be made which combines a particular material selection with a particular "mesh density", i.e. a ratio between the number of wires and a dimensional co-ordinate (a linear or surface co-ordinate) that is significantly higher than that of similar metallic-mesh semi-worked pieces already known in the art; in this regard it will be recognised that the known art is not substantially able to obtain metallic meshes in which meshes are very close or have a high density, using high-carbon steel wires, due to the difficulties in working this material.

[0022] To complete the description, the expression "high-carbon steel" referred to in this specification (and also repeated in the following claims) is used to indicate a steel family in which there is such a carbon percentage that particular values of modulus of elasticity and breaking stress are determined, as shown in the following table by way of example:

[0023] More particularly, for the material concerned with the present invention, an overall range of modulus of elasticity included between 2000 and 3350 N/mm2 can be identified.

[0024] At the same time, the sizes of the wires that can be used in the present invention, and the related "obtainable mesh densities" (both in the weft and in the warp direction) can be summarised in the following table of examples:

(continued)

[0025] In one of the possible embodiments of the invention, all primary threadlike elements 2a and/or all secondary threadlike elements 3a (or also part of them, such as one wire every "n" wires, "n" varying between 2 and 10, for exam pie) are made up of high-carbon steel.

[0026] To enable the desired combinations between high mesh density and appropriate mechanical performance to be obtained, the average diameter of the primary threadlike elements 2a can be included between 0.10 mm and 0.60 mm (and it may be included between 0.25 mm and 0.55 mm for example, or also between 0.30 mm and 0.45 mm) .

[0027] At the same time, the average diameter of the secondary threadlike elements 3a can be included between 0.10 mm and 0.50 mm (and may be included between 0.15 mm and 0.26 mm or also between 0.16 mm and 0.20 mm, for example).

[0028] On the contrary, as to the mesh densities obtainable with the present invention, it is possible to state just as an indication that the primary threadlike elements 2a define an average mesh density "in the weft direction" included between 4 wires/cm and 12 wires/cm, while the secondary threadlike elements 3a define an average mesh density "in the warp direction" included between 16 wires/cm and 120 wires/cm.

[0029] From a structural point of view, the weft and warp wires can be of any type, provided they are adapted to ensure the necessary dimensional coherence and the required compactness (for instance, in order to obtain an optimal compromise between high filtering capability and maintenance of the planar character and sturdiness, should the semi-worked piece in accordance with the invention act as a filtering element in machines for processing plastic and/or polymeric materials); for instance, the ends of the weft wires can be "open" (i.e. cut, so that the weft is defined by a series of segmented wires parallel to each other but discontinuous from the topologie point of view) or "closed" (therefore giving rise to a weft formed of a single wire having a serpentine-like course).

[0030] Conveniently, the choice of providing a weft with "open" or "closed" ends is based on current requirements, such as taking into account the different types of finish to be given to the edges of the semi-worked piece, for example.

[0031] The semi-worked piece of the invention can take different conformations in space, a planar conformation or not, depending on current requirements; in a particularly simple embodiment thereof, a polygonal (typically rectangular) flat figure is defined or, more generally, a figure having a middle axis 4 (in the same direction as the weft 2 or as warp 3).

[0032] Conveniently, depending on the mechanical performance that is wished to be given to the semi-worked piece, at least one reinforcing side portion 5 can be present which extends parallel to said middle axis 4 and is located at and/or close to at least one edge 5a of the semi-worked piece.

[0033] Said reinforcing side portion 5 can be made in different ways: for instance, it can have a local mesh density (in the warp direction, for example) different from (e.g. slightly smaller than, but also equal to, depending on current requirements) that typical of the rest of the semi-worked piece; in order to maximise the performance of same (and at the same time minimise extension thereof), the reinforcing side portion 5 can be made with high-carbon steel wires.

[0034] As an alternative to the presence of the reinforcing side portion 5 (but, if necessary, also in combination therewith), at least one folded portion 6 which is disposed at and/or in the vicinity of at least one edge 5a can also be present; this folded portion 6 defines a folding line 6a preferably parallel to the edge 5a, and use of same for instance takes place in those semi-worked products in which the weft wires have "open" ends; in these cases the folding line located close to edge 5a allows the ends of the weft wires to be brought inwards of the semi-worked piece, therefore eliminating possible risks of getting caught or even of loss of the interknitting structure.

[0035] To the aims of the present invention the presence of two or more reinforcing side portions 5 is also possible, as well as of two or more folded portions 6 that can be disposed close to/at the parallel sides of the semi-worked piece 1, for example.

[0036] As already mentioned at different points before, it is an aim of the present invention to conceive a particular application (or "use") of the semi-worked piece 1 herein described (and hereinafter claimed); in particular, it is an aim of the invention to provide a filtering element associable with machines for processing plastic and/or polymeric materials which comprises an active portion (adapted to carry out filtering on a flow of plastic and/or polymeric material) and a longitudinal hem delimiting this active portion.

[0037] Advantageously, at least the active portion of this filtering element can be made of at least one semi-worked piece 1 of metallic mesh as hereinbefore described and/or as claimed in the following.

[0038] Likewise, it is also an aim of the present invention to provide an innovative and original method of manufacturing a metallic-mesh semi-worked piece (which method can be for example put into practice for making a filtering element associable with processing machines for plastic and/or polymeric materials).

[0039] This method comprises the following steps: first of all, providing a multiplicity of primary threadlike elements 2a made of metal material having an average diameter included between 0,25 mm and 0.45 mm ; simultaneously providing a multiplicity of secondary threadlike elements 3a in turn having an average diameter included between 0.16 mm and 0.26 mm; and then interweaving the primary threadlike elements 2a with the secondary threadlike elements 3a in order to obtain a textile structure consisting of a weft 2 and a warp 3.

[0040] Advantageously, the textile structure defined hereabovewill have an "average" mesh density in the weft direction included between 4 wires/cm and 12 wires/cm, while it will have an "average" mesh density in the warp direction included between 16 wires/cm and 120 wires/cm; at the same time, at least one or preferably part of the primary threadlike elements 2a and/or of the secondary ones 3a will include high-carbon steel wires.

[0041] The invention allows achievement of important advantages.

[0042] First of all, it is to be pointed out that due to the particular construction architecture of the semi-worked piece 1 as well as the particular selection of the constituent materials thereof, an efficient mesh structure is obtained associated with an efficient capability of withstanding mechanical stresses; this involves the possibility of using this semi-worked piece in heavy duty machinery (such as use as filtering element in machines for processing plastic materials).

[0043] In addition, the possibility of introducing important structural variations ("closed" or "open" ends of the weft wires, presence of reinforcing portions in the vicinity of the edges, possible presence of structures having folded and/or layered portions and others) further increases the application flexibility of the present semi-worked piece, without at all events varying the inventive base concept.

[0044] Secondly, it is to be noted that due to the wide possibility of correlation between the material forming the wires and the mesh diameters and density, a wide variety of semi-worked products can be manufactured which therefore can be adjusted to different filtering conditions in as many different machines, or more generally can be such adjusted that they can satisfy different operating requirements in the most varied machines or environments.

[0045] It will be also appreciated that the possibility of using high-carbon steel wires through operations for waste recovery and/or recycling of other materials can constitute an efficient re-use of the materials themselves, which will advantageously reduce the environmental impact.

[0046] Finally, the present invention enables production of metallic-mesh semi-worked pieces offering high performance while at the same time allowing low production costs and consequently reduced sale prices.

Claims 1. A metallic-mesh semi-worked piece, comprising: - a weft (2) defined by a multiplicity of primary threadlike elements (2a) made of metal material; and - a warp (3) interlaced with said weft (2) and defined by a multiplicity of secondary threadlike elements (3a), at least one of the primary and/or secondary threadlike elements (2a and/or 3a) being formed with high-carbon steel material; characterized in that an average diameter of the primary threadlike elements (2a) is included between 0.25 mm and 0.45 mm and in that an average diameter of the secondary threadlike elements (3a) is included between 0.16 mm and 0.26 mm. 2. A semi-worked piece as claimed in claim 1, wherein all the primary threadlike elements (2a) and/or all the secondary threadlike elements (3a) consist of high-carbon steel material. 3. A semi-worked piece as claimed in anyone of the preceding claims, wherein the primary threadlike elements (2a) define an average mesh density in the weft direction included between 4 wires/cm and 12 wires/cm. 4. A semi-worked piece as claimed in anyone of the preceding claims, wherein the secondary threadlike elements (3a) define an average mesh density in the warp direction included between 16 wires/cm and 120 wires/cm. 5. A semi-worked piece as claimed in anyone of the preceding claims, wherein also defined is a middle axis (4) directed in the weft (2) or the warp (3) direction and wherein at least one reinforcing side portion (5) is present which extends parallel to said middle axis (4) and is located at and/or close to at least one edge (5a) of the semi-worked piece itself, said at least one reinforcing side portion (5) preferably having a local mesh density in the warp direction that is locally different from said average mesh densities in the weft and/or in the warp direction and being more preferably made up of high-carbon steel wires. 6. A semi-worked piece as claimed in anyone of the preceding claims, wherein also present is at least one folded portion (6) at and/or close to at least one edge (5a), said folded portion (6) defining a folding line (6a) preferably parallel to the edge (5a). 7. A filtering element associable with machines for processing plastic materials, comprising an active portion adapted to carry out filtering on a flow of a plastic and/or polymeric material and a longitudinal hem confining said active portion, characterised in that at least the active portion is made of at least one semi-worked piece of metallic mesh or wire cloth as claimed in anyone of the preceding claims. 8. A method of manufacturing a metallic-mesh semi-worked piece, preferably for producing a filtering element associable with machines for processing plastic materials and/or polymeric materials, the method being characterised in that it comprises the following steps: - providing a multiplicity of primary threadlike elements (2a) made of metal material having an average diameter included between 0.25 mm and 0.45 mm; - providing a multiplicity of secondary threadlike elements (3a) in turn having an average diameter included between 0.16 mm and 0.26 mm; and - interweaving said primary and secondary threadlike elements (2a, 3a) in order to obtain a textile structure consisting of a weft (2) and a warp (3), at least one or preferably part of the primary threadlike elements (2a) and/or of the secondary ones (3a) including high-carbon steel wires.

Patentansprüche 1. Metallisches Siebhalbzeug, umfassend: - einen Schuss (2), definiert durch eine Vielzahl an fadenförmigen Hauptelementen (2a), bestehend aus Metallmaterial, und - eine Kette (3), die mit dem Schuss (2) verflochten ist und durch eine Vielzahl an fadenförmigen Hilfselementen (3a) definiert ist, wobei mindestens entweder ein fadenförmiges Haupt- und/oder Hilfselement (2a und/oder 3a) mit Stahlmaterial mit hohem Kohlenstoffgehalt geformt ist; dadurch gekennzeichnet, dass ein durchschnittlicher Durchmesser der fadenförmigen Hauptelemente (2a) zwischen 0,25 mm und 0,45 mm eingeschlossen ist und dass ein durchschnittlicher Durchmesser der fadenförmigen Hilfselemente (3a) zwischen 0,16 mm und 0,26 mm eingeschlossen ist. 2. Metallisches Siebhalbzeug nach Anspruch 1, wobei alle fadenförmigen Hauptelemente (2a) und/oder alle fadenförmigen Hilfselemente (3a) aus Stahlmaterial mit hohem Kohlenstoffgehalt bestehen. 3. Halbzeug nach einem der vorhergehenden Ansprüche, wobei die fadenförmigen Hauptelemente (2a) eine durchschnittliche Maschendichte in Kettenrichtung eingeschlossen zwischen 4 Drähten/cm und 12 Drähten/cm definieren. 4. Halbzeug nach einem der vorhergehenden Ansprüche, wobei die fadenförmigen Hilfselemente (3a) eine durchschnittliche Maschendichte in Kettenrichtung eingeschlossen zwischen 16 Drähten/cm und 120 Drähten/cm definieren. 5. Halbzeug nach einem der vorhergehenden Ansprüche, wobei auch eine Mittelachse (4) in Richtung des Schusses (2) oder der Kette (3) definiert ist, und wobei mindestens ein verstärkender Seitenabschnitt (5) vorhanden ist, der sich parallel zur Mittelachse (4) erstreckt und an mindestens einer Kante (5a) des Halbzeugs und/oder in deren Nähe befindlich ist, wobei der mindestens eine verstärkende Seitenabschnitt (5) vorzugsweise eine lokale Maschendichte in Kettenrichtung aufweist, die sich lokal von den genannten durchschnittlichen Maschinendichten in Schuss-und/oder Kettenrichtung unterscheidet und vorzugsweise aus Stahldrähten mit hohem Kohlenstoffgehalt besteht. 6. Halbzeug nach einem der vorhergehenden Ansprüche, wobei auch mindestens ein gefalteter Abschnitt (6) vorhanden ist, der sich an mindestens einer Kante (5a) und/oder in deren Nähe befindet, wobei der gefaltete Abschnitt (6) eine Faltlinie (6a) definiert, die vorzugsweise parallel zur Kante (5a) verläuft. 7. Filterelement, das mit Maschinen zur Bearbeitung von KunststofFmaterialen verbunden werden kann, umfassend einen aktiven Abschnitt, der ausgelegt ist, um eine Strömung eines KunststofF- und/oder Polymermaterials zu filtern, und eine Längsstoßkante, die den aktiven Abschnitt abgrenzt, dadurch gekennzeichnet, dass mindestens der aktive Abschnitt aus mindestens einem Halbzeug aus metallischen Maschen oder Drahtgewebe nach einem der vorhergehenden Ansprüche besteht. 8. Verfahren zur Herstellung eines metallischen Siebhalbzeugs, vorzugsweise zur Herstellung eines Filterelements, das mit Maschinen zur Bearbeitung von Kunststoff- und/oder Polymermaterialien verbunden werden kann, wobei das Verfahren dadurch gekennzeichnet ist, dass es folgende Schritte umfasst: - Bereitstellen einer Vielzahl an fadenförmigen Hauptelementen (2a), bestehend aus einem Metallmaterial, aufweisend einen durchschnittlichen Durchmesser eingeschlossen zwischen 0,25 mm und 0,45 mm; - Bereitstellen einer Vielzahl an fadenförmigen Hilfselementen (3a), aufweisend dagegen einen durchschnittlichen Durchmesser eingeschlossen zwischen 0,16 mm und 0,26 mm, und -Verflechten derfadenförmigen Haupt- und Hilfselemente (2a, 3a), um eineTextilstrukturzu erhalten, bestehend aus einem Schuss (2) und einer Kette (3), wobei mindestens eins oder vorzugsweise ein Teil derfadenförmigen Hauptelemente (2a) und/oder der Hilfselemente (3a) Stahldrähte mit hohem Kohlenstoffgehalt umfasst.

Revendications 1. Pièce semi-travaillée en treillis métallique, comprenant : - une trame (2) formée par une multiplicité d’éléments filiformes primaires (2a) réalisés dans un matériau métallique ; et - une chaîne (3) entrelacée avec ladite trame (2) et formée par une multiplicité d’éléments filiformes secondaires (3a), au moins un des éléments filiformes primaires et/ou secondaires (2a et/ou 3a) étant réalisé dans un matériau en acier à haute teneur en carbone ; caractérisée en ce qu’un diamètre moyen des éléments filiformes primaires (2a) est compris entre 0,25 mm et 0,45 mm et en ce qu’un diamètre moyen des éléments filiformes secondaires (3a) est compris entre 0,16 mm et 0,26 mm. 2. Pièce semi-travaillée selon la revendication 1, dans laquelle tous les éléments filiformes primaires (2a) et/ou tous les éléments filiformes secondaires (3a) consistent en un matériau en acier à haute teneur en carbone. 3. Pièce semi-travaillée selon l’une quelconque des revendications précédentes, dans laquelle les éléments filiformes primaires (2a) forment une densité moyenne du treillis dans la direction de la trame comprise entre 4 fils/cm et 12 fils/cm. 4. Pièce semi-travaillée selon l’une quelconque des revendications précédentes, dans laquelle les éléments filiformes secondaires (3a) forment une densité moyenne de treillis dans la direction de la chaîne comprise entre 16 fils/cm et 120 fils/cm. 5. Pièce semi-travaillée selon l’une quelconque des revendications précédentes, dans laquelle est également formé un axe central (4) dirigé en direction de la trame (2) ou de la chaîne (3) et dans laquelle est présente au moins une portion latérale de renforcement (5) qui se développe parallèle au dit axe central (4) et située au niveau et/ou à proximité d’au moins un bord (5a) de la pièce semi-travaillée, ladite au moins une portion latérale du renforcement (5) présentant de préférence une densité locale de treillis en direction de la chaîne qui est localement différente des dites densités moyennes de treillis dans la direction de la trame et/ou de la chaîne et étant composée de manière encore plus préférentielle de fils d’acier à haute teneur en carbone. 6. Pièce semi-travaillée selon l’une quelconque des revendications précédentes, dans laquelle est également présente au moins une portion pliée (6) au niveau et/ou à proximité d’au moins un bord (5a), ladite portion pliée (6) formant une ligne de pliage (6a) de préférence parallèle au bord (5a). 7. Élément de filtrage pouvant être associé aux machines pour traiter le plastique et comprenant une portion active pouvant réaliser le filtrage au niveau d’un flux d’un matériau plastique et/ou polymérique et un ourlet longitudinal limitant ladite portion active, caractérisé en ce qu’au moins la portion active réalisée en au moins une pièce semi-travaillée de treillis métallique ou d’un tissu métallique selon l’une quelconque des revendications précédentes. 8. Procédé de réaliser une pièce semi-travaillée en treillis métallique, de préférence pour produire un élément de filtrage pouvant être associé aux machines pour traiter les matériaux plastiques et/ou polymériques, le procédé étant caractérisé en ce qu’il comprend les étapes suivantes : - fournir une multiplicité d’éléments filiformes primaires (2a) réalisés dans un matériau métallique ayant un diamètre moyen compris entre 0,25 mm et 0,45 mm ; - fournir une multiplicité d’éléments filiformes secondaires (3a) ayant à leur tour un diamètre moyen compris entre 0,16 mm et 0,26 mm ; et - entrelacer lesdits éléments filiformes primaires et secondaires (2a, 3a) de manière à obtenir une structure textile consistant en une trame (2) et en une chaîne (3), au moins un ou de préférence une partie des éléments filiformes primaires (2a) et/ou des éléments filiformes secondaires (3a) comprenant des fils en acier à haute teneur en carbone.

Claims (6)

METAL NETWORK, SEMI-WORKED WORKS AND PROCESSING PROCESSES 1, Fambalism;,: Data-processed datab, which includes: * a presumed (2): multiple, metallic material: finished, primary fenafery (2a); and - a brain chain (3) interwoven with the weft (2), which is defined by a plurality of secondary beamer elements (3a) which are primary and / or secondary to faharer elements (Za and / or 30 at least one of the large characterized in that the average diameter of the primary filamentous elements C2a) is .0.25: mm and; Between 1.45 mm and with a cross-sectional diameter of 0.16 mm and 0.2S mm for the secondary threads (Sa) 2. according to claim 1; semi-machined; a piece in which all of the primary yarn element (2a) and / or all secondary yarn element (la) are of high carbon content steel material: pseudo. 3, Claim 1 or 2; a semi-machined piece according to claim 1, wherein the primary battlements (2a) define a 4 mesh / cm and an average mesh of 12 mesh / m on the bellows; 4. Any of the preceding Claims claims is a semi-machined piece in which the secondary spinning · ® elements (3a) in the longitudinal portion have a '16 wire / cm and 120 'blade / yia''lözdlözdi mean graininess: S ,. Half a lg machined piece according to any one of the preceding claims, wherein one of the projections (4) in the direction of the projection (ágy 2) is defined as the center axis (4) in the line (3}), and in which there is at least one reinforcing side portion (5) which has a rocking axis (4). ) extends parallel to, and is located near, at least one edge (5a) and / or at least one of the edges of the half-piece work (at least one amplifying echo pin (5) of the llnclrénybap that has a local eye syrup that is locally different from the veins). - and / or the average diameter of the filament, and more preferably formed by high carbon steel wires, 6, Az; The upwardly machined piece according to any one of the preceding claims, wherein at least one folded portion (6) is provided at least on one of the edges (5a) and / or adjacent to the folded portion (6), defines a parallel line of preferably a wind 03} 6a) 7. Eyeshadow which can be used for machines for treating plastics, which includes a filter for filtering a stream of plastic and / or a polymeric material, and an active edge delimiting the active portion, characterized in that at least the active part is made of at least one winter-laminated or woven fabric piece according to any one of the preceding claims. S. Sjáfis Mmhálős, for the manufacture of a machined piece, preferably for use in the manufacture of a filter medium for machines treating plastics and / or polymeric materials, characterized by the following steps: ~ ordering a plurality of primary filament elements of a material: (2a) having an average diameter of between 0.25 mm and 0.45 mm; «Providing a plurality of second-threaded elements (3a) which, in turn, have an average diameter between Oil # mm and 0.26 mm; and - assembling the primary and secondary wave elements (2a, 3a) in order to obtain a seam line (2j and one chain (3) consisting of at least one of the primary (2a) and / or secondary yarn-like elements (3a)) or preferably a portion of high carbon steel wires.