EP2411572B2 - Metallic mesh semi-worked piece, and method for the realization thereof - Google Patents
Metallic mesh semi-worked piece, and method for the realization thereof Download PDFInfo
- Publication number
- EP2411572B2 EP2411572B2 EP09787670.0A EP09787670A EP2411572B2 EP 2411572 B2 EP2411572 B2 EP 2411572B2 EP 09787670 A EP09787670 A EP 09787670A EP 2411572 B2 EP2411572 B2 EP 2411572B2
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- EP
- European Patent Office
- Prior art keywords
- semi
- threadlike elements
- wires
- worked piece
- primary
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- 238000000034 method Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims description 32
- 238000001914 filtration Methods 0.000 claims description 26
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000007769 metal material Substances 0.000 claims description 7
- 239000004753 textile Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000003542 behavioural effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D9/00—Open-work fabrics
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/60—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the warp or weft elements other than yarns or threads
- D03D15/67—Metal wires
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/10—Inorganic fibres based on non-oxides other than metals
- D10B2101/12—Carbon; Pitch
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/20—Metallic fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/063—Load-responsive characteristics high strength
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2501/00—Wearing apparel
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2501/00—Wearing apparel
- D10B2501/04—Outerwear; Protective garments
- D10B2501/043—Footwear
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/04—Filters
Definitions
- 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.
- metallic mesh or more generally a structure of the "textile” type formed with metal elements consisting of suitably combined weft and warp wires
- 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.
- 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.
- a metallic-mesh semi-worked piece according to the preamble of claim 1 is known from US2007/0235595 A1 .
- 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.
- 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.
- 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.
- 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).
- the semi-worked piece 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.
- 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.
- 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.
- 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.
- a metallic-mesh semi-worked piece 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.
- 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 tensile strength and breaking force are determined, as shown in the following table by way of example: wire diameter (mm) tensile strength (N/mm 2 ) breaking force (N) 0,15 2600-2900 42-54 0,20 2750-3050 82-100 0,25 2750-3350 129-170 0,28 2750-3050 163-193 0,295 2450-2750 163-193 0,30 2450-3350 169-243 0,33 3050-3350 255-293 0,35 3050-3350 287-329 0,38 2450-3050 273-352 0,45 2450-3050 386-490 0,50 2450-3050 475-605 0,56 2450-3050 600-755 0,60 2450-3050 690-865 0,65 2450-3050 815-1010 0,71 2450-3050 970-1210 0,80 2150-2750 1090-1375
- an overall range of tensile strength included between 2000 and 3350 N/mm can be identified.
- wire diameter (mm) minimum mesh density (wires/cm) maximum mesh density (wires/cm) 0,10 80 114 0,11 73 104 0,12 67 95 0,13 62 88 0,14 57 81 0,15 53 76 0,16 50 71 0,17 47 67 0,18 44 63 0,19 42 60 0,20 40 57 0,21 38 54 0,22 36 52 0,23 35 50 0,24 33 48 0,25 32 46 0,26 31 44 0,27 30 42 0,28 29 41 0,29 28 39 0,30 27 38 0,31 26 37 0,32 25 36 0,33 24 35 0,34 24 34 0,35 23 33 0,36 22 32 0,37 22 31 0,38 21 30 0,39 21 29 0,40 20 29 0,41 20 28 0,42 19 27 0,43 19 27 0,44 18 26 0,45 18 25 0,46 17 25 0,47 17 24 0,48 17 24 0,49 16 23 0,
- all primary threadlike elements 2a and/or all secondary threadlike elements 3a are made up of high-carbon steel.
- 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).
- 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).
- 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.
- 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.
- weft is defined by a series of segmented wires parallel to each other but discontinuous from the topologic point of view) or "closed" (therefore giving rise to a weft formed of a single wire having a serpentine-like course).
- 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.
- 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).
- 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.
- 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.
- 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.
- the present invention 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.
- 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.
- This method comprises the following steps:
- the textile structure defined hereabove will 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.
- the invention allows achievement of important advantages.
- 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.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Woven Fabrics (AREA)
- Filtering Materials (AREA)
Description
- 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.
- 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.
- 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). 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 round: usually, these filtering elements consist of woven materials made of annealed low-carbon steel. 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).
- 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.
- 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.
- 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.
- A metallic-mesh semi-worked piece according to the preamble of claim 1 is known from
US2007/0235595 A1 . - 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.
- 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.
- 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.
- 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.
- 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 there-of 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 inFig. 1 ; and -
Figs. 3 and 4 show two possible alternative embodiments of the semi-worked piece according to the invention. - 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).
- From a structural point of view, the semi-worked piece 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. - 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.
- 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.
- 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.
- 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).
- 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.
- 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 tensile strength and breaking force are determined, as shown in the following table by way of example:
wire diameter (mm) tensile strength (N/mm2) breaking force (N) 0,15 2600-2900 42-54 0,20 2750-3050 82-100 0,25 2750-3350 129-170 0,28 2750-3050 163-193 0,295 2450-2750 163-193 0,30 2450-3350 169-243 0,33 3050-3350 255-293 0,35 3050-3350 287-329 0,38 2450-3050 273-352 0,45 2450-3050 386-490 0,50 2450-3050 475-605 0,56 2450-3050 600-755 0,60 2450-3050 690-865 0,65 2450-3050 815-1010 0,71 2450-3050 970-1210 0,80 2150-2750 1090-1375 - More particularly, for the material concerned with the present invention, an overall range of tensile strength included between 2000 and 3350 N/mm can be identified.
- 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:
wire diameter (mm) minimum mesh density (wires/cm) maximum mesh density (wires/cm) 0,10 80 114 0,11 73 104 0,12 67 95 0,13 62 88 0,14 57 81 0,15 53 76 0,16 50 71 0,17 47 67 0,18 44 63 0,19 42 60 0,20 40 57 0,21 38 54 0,22 36 52 0,23 35 50 0,24 33 48 0,25 32 46 0,26 31 44 0,27 30 42 0,28 29 41 0,29 28 39 0,30 27 38 0,31 26 37 0,32 25 36 0,33 24 35 0,34 24 34 0,35 23 33 0,36 22 32 0,37 22 31 0,38 21 30 0,39 21 29 0,40 20 29 0,41 20 28 0,42 19 27 0,43 19 27 0,44 18 26 0,45 18 25 0,46 17 25 0,47 17 24 0,48 17 24 0,49 16 23 0,50 16 23 - 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 example) are made up of high-carbon steel.
- 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).
- 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).
- 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.
- 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 topologic point of view) or "closed" (therefore giving rise to a weft formed of a single wire having a serpentine-like course).
- 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.
- 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).
- 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 saidmiddle axis 4 and is located at and/or close to at least oneedge 5a of the semi-worked piece. - 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 reinforcingside portion 5 can be made with high-carbon steel wires. - 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 oneedge 5a can also be present; this foldedportion 6 defines a folding line 6a preferably parallel to theedge 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 toedge 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. - 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 foldedportions 6 that can be disposed close to/at the parallel sides of the semi-worked piece 1, for example. - 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. 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.
- 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).
- 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. - Advantageously, the textile structure defined hereabove will 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.
- The invention allows achievement of important advantages.
- 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).
- 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.
- 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.
- 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.
- 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 (8)
- 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 one1 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,
and in that said high-carbon steel has an overall range of tensile strength included between 2000 and 3350 N/mm2. - 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 having an overall range of tensile strength included between 2000 and 3350 N/mm2.
- 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.
- 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.
- 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) 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 made up of high-carbon steel wires having an overall range of tensile strength included between 2000 and 3350 N/mm2.
- 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).
- 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.
- 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 wires made of high-carbon steel having an overall range of tensile strength included between 2000 and 3350 N/mm2.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL09787670.0T PL2411572T5 (en) | 2009-03-23 | 2009-03-23 | Metallic mesh semi-worked piece, and method for the realization thereof |
SI200931367A SI2411572T1 (en) | 2009-03-23 | 2009-03-23 | Metallic mesh semi-worked piece, and method for the realization thereof |
SI200931367T SI2411572T2 (en) | 2009-03-23 | 2009-03-23 | Metallic mesh semi-worked piece, and method for the realization thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2009/000109 WO2010109497A1 (en) | 2009-03-23 | 2009-03-23 | Metallic mesh semi-worked piece, and method for the realization thereof |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2411572A1 EP2411572A1 (en) | 2012-02-01 |
EP2411572B1 EP2411572B1 (en) | 2016-01-13 |
EP2411572B2 true EP2411572B2 (en) | 2021-02-24 |
Family
ID=41666480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09787670.0A Active EP2411572B2 (en) | 2009-03-23 | 2009-03-23 | Metallic mesh semi-worked piece, and method for the realization thereof |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2411572B2 (en) |
ES (1) | ES2562801T5 (en) |
HU (1) | HUE026839T2 (en) |
PL (1) | PL2411572T5 (en) |
PT (1) | PT2411572E (en) |
SI (2) | SI2411572T2 (en) |
WO (1) | WO2010109497A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101808632B1 (en) * | 2016-03-24 | 2017-12-13 | 주식회사 송이실업 | Manufacturing method of fabric for wearable solar cell and fabric for wearable solar cell thereby |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2074665A (en) * | 1934-08-02 | 1937-03-23 | Samuel H Palmer | Woven wire screen |
US3897289A (en) | 1970-09-03 | 1975-07-29 | Goodyear Tire & Rubber | Method of forming wire woven fabric for pneumatic tires |
DE2924382A1 (en) | 1979-06-16 | 1980-12-18 | Haver & Boecker | Filter disc from wire mesh - being punched out and compressed to give reinforced edge |
US4320160A (en) * | 1979-08-21 | 1982-03-16 | Toray Industries, Inc. | Fabric structure for fiber reinforced plastics |
NL8302739A (en) * | 1983-08-02 | 1985-03-01 | Bekaert Sa Nv | OPEN-SIZED TISSUE. |
GB2324100A (en) * | 1997-04-07 | 1998-10-14 | Soar Engineering Ltd | Woven protective mesh |
US5944197A (en) | 1997-04-24 | 1999-08-31 | Southwestern Wire Cloth, Inc. | Rectangular opening woven screen mesh for filtering solid particles |
WO2001044548A1 (en) * | 1999-12-15 | 2001-06-21 | N.V. Bekaert S.A. | Reinforced fabric |
FR2821630B1 (en) * | 2001-03-02 | 2003-06-27 | Ferrari S Tissage & Enduct Sa | FABRIC HAVING ANTI-LACERATION PROPERTIES |
EP1312468A1 (en) * | 2001-11-19 | 2003-05-21 | N.V. Bekaert S.A. | Layered structure |
US7341076B2 (en) * | 2006-04-10 | 2008-03-11 | Nv Bekaert Sa | Woven fabric comprising leno weave bound metal |
-
2009
- 2009-03-23 SI SI200931367T patent/SI2411572T2/en unknown
- 2009-03-23 PL PL09787670.0T patent/PL2411572T5/en unknown
- 2009-03-23 PT PT97876700T patent/PT2411572E/en unknown
- 2009-03-23 ES ES09787670T patent/ES2562801T5/en active Active
- 2009-03-23 SI SI200931367A patent/SI2411572T1/en unknown
- 2009-03-23 WO PCT/IT2009/000109 patent/WO2010109497A1/en active Application Filing
- 2009-03-23 EP EP09787670.0A patent/EP2411572B2/en active Active
- 2009-03-23 HU HUE09787670A patent/HUE026839T2/en unknown
Non-Patent Citations (1)
Title |
---|
DEREK B. PURCHAS, KEN SUTHERLAND: "Handbook of Filter Media, 2nd edition", 2002, ELSEVIER, ISBN: 978-1-85617-375-9, article "Chapter 6, Screens and Meshes", pages: 200, 202 † |
Also Published As
Publication number | Publication date |
---|---|
ES2562801T5 (en) | 2021-11-17 |
PT2411572E (en) | 2016-03-09 |
SI2411572T1 (en) | 2016-06-30 |
ES2562801T3 (en) | 2016-03-08 |
HUE026839T2 (en) | 2016-07-28 |
PL2411572T5 (en) | 2023-12-04 |
EP2411572A1 (en) | 2012-02-01 |
PL2411572T3 (en) | 2016-06-30 |
SI2411572T2 (en) | 2021-07-30 |
WO2010109497A1 (en) | 2010-09-30 |
EP2411572B1 (en) | 2016-01-13 |
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