MXPA01005563A - Conveyor belting with reinforcing fabric formed from three interlaced layers - Google Patents

Abstract

A belting (10) reinforced with at least one fabric ply (16). The fabric ply (16) is a composite fabric (26). The fabric (26) has two woven layers (28, 30) and an intermediate third layer of straight warp yarns (34). The woven layers (28, 30) and straight warp yarns (34) are bound together by a plurality of binder yarns (38). Each layer (28, 30, 34) of the fabric (26) contributes substantially 25-40%to the overall strength of the fabric (26). The composite fabric (26) may be used in a multi-ply belting (10) for heavy duty applications;wherein the fabric ply (26) is the center ply (16) and provides approximately 50 to 75%of the overall belting strength. The fabric (26) may also be used as a single reinforcing ply for light duty application belting.

Description

CONVEYOR BELT. WITH MODIFIED TISSUE TECHNICAL FIELD The invention described is directed to an improved construction for a reinforcing fabric for webs. More specifically, the described reinforcing fabric is a composite fabric, which supplies the web with superior properties, such as high tear resistance, transverse tear resistance, impact resistance, flexibility properties and against fraying.

Previous Technique The current transport bands are constructed with multiple layers of fabrics. The band designs use layers of all straight warp designs or solid fabrics or multilayer polyester and nylon fabrics. Such unique tissue constructions limit the physical properties that can be obtained from the band. The patents of Morrison, U.S. 4,371,580 and 4,518,647 disclose multiple tissue layers within an agricultural web material. The outer fabric layers have less stretch resistance and longer life to flex fatigue than internal tissue layers. Conveyor belts with layers of composite fabrics are also known in the art.

The U.S. patent 5,495,935 describes a conveyor belt with multilayer fabrics. This fabric is formed of two woven canvases, with an intermediate elastomeric layer. Woven canvases are connected by a plurality of matted short fibers. The U.S. patent 4,813,533 discloses a conveyor belt formed of two woven layers and an intermediate non-woven mat, interconnected by ligature yarn. Before joining, the layers are saturated with a polymeric resin. This resin fills all the holes in each layer of textile fabric. One described belt specimen is suitable for a working load load of 90.72 kg by 2.54 in width, and the composite layer has a thickness of approximately 0.508 cm, with a general belt thickness of approximately 1778 cm. The U.S. patent No. 4,928,812 discloses a PVC conveyor belt, with a multiple layer fabric, designed for heavy load applications. The reinforcement layer is composed of three layers, with upper and lower cotton warp fabrics and nylon weft yarns, and an intermediate layer of alternative aramid and cotton cables bearing charge, with a diameter of 4 to 15 mm. The alternative cables of aramid and cotton, which are loaded, are spaced by a distance of 0.5 to 2 times the diameter of the cable. The three layers are connected together by pairs of nylon ligature threads. Conventional warp knitted fabric designs are also associated with problems, such as tissue extension and lack of flexibility. These problems are eliminated by the described invention. The present invention is directed to a web with at least one layer of reinforcing fabric of the structure of the invention. The fabric of the invention is defined by a composite structure, in which all layers of the fabric contribute substantially to the overall strength of the fabric. Due to the contribution of each layer of the composite fabric, this fabric has a tear resistance, transverse tear resistance, impact resistance, properties of flexibility and against fraying, compared to other known and conventional reinforcement band fabrics. The fabric of the invention can be used as the sole reinforcing structure in one band or combined with other layers for multiple bands. layers. The number of layers and the combinations used are dependent on the desired application for the band.

- Mi ^ M Compendium of the Invention In accordance with the present invention, a reinforcing fabric for a band is described. This reinforcing fabric is a composite fabric, which provides the belt with superior properties, such as high tear strength, transverse tear resistance, impact resistance, properties of flexibility and against fraying. According to the present invention, the composite has two woven layers and a third intermediate layer of straight warp yarns. In each layer of the fabric, the two woven layers and the third layer contribute approximately 25 to 40% of the overall strength of the fabric. According to a further aspect of the present invention, each layer of composite fabric contributes substantially equal to the overall strength of the fabric. According to a further aspect of the present invention, the two woven layers and the third intermediate layer of the composite fleece, are joined together by ligature yarns, which extend from the first woven layer, through the third intermediate layer, to the second woven layer.

- * ** - • In a further aspect of the present invention, 10 to 75% of the weft yarns of the first and second woven layers can be monofilament cords, thereby increasing the cross-sectional properties of the fabric and the formed web with the composite fabric. In one embodiment of the invention described, the band is reinforced only with the composite fabric. This composite fabric, formed with the selective replacement of the monofilament cords, is particularly useful for the single-layer band. The band is also provided with layers of rubber foam on each side of the reinforcing layer. Such belts are particularly useful for the applications of bands and transports for light work. In another embodiment of the invention described, a multilayer band is described. The composite fabric is the central reinforcement layer, with the outer fabric layers and the intermediate foam rubber layers. When the composite fabric is combined with other types of reinforcement fabric layers, the composite fabric provides approximately 50 to 75% of the overall strength of the web. Multiple composite layers can be used in such a multilayer band. These belts are particularly useful for heavy duty conveyor and belt applications.

Definitions "Ligation thread" denotes a thread that is used to join different threads together in a fabric. "Fabric" or "Fabric" denotes a network of cords / threads, which extend essentially unidirectionally, which may be twisted and which may, in turn, be composed of a plurality of a multiplicity of filaments (which may also be crooked). The fabric is braided and flexible. "Filament thread" denotes a thread that is formed of continuous cords of equal length. "Twisted yarn" denotes a yarn that is formed of a plurality of strands of unequal lengths, twisted together to form a yarn. "Monofilament thread" denotes a thread that is a single continuous cord. "Warp" refers to the network of cords / threads that extend unidirectionally in essence, in the longitudinal direction of the web. "Weft" (padding) refers to the cord / thread placed at right angles to the warp cords / threads. "Woven Fabric" refers to the interlacing of two sets of threads, the warp and weft threads, at right angles.

"Flat fabric" refers to the type of braid, in which each warp thread intertwines a thread at a time with each weft thread, and vice versa. The flat woven fabric has the same appearance on both sides of this fabric. "Twill weave" refers to a type of fabric in which there are smaller interweaves between the warp and weft threads, than in flat woven fabrics. Twill fabrics are characterized by diagonal lines on the fabric. "Thread": a generic term for a continuous string of textile fibers or filaments. The thread occurs in the following ways: 1) number of fibers twisted together; 2) a number of filaments placed together without twisting; 3) a number of filaments placed together with a degree of twisting; 4) a single filament, with or without twisted (monofilament).

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in exemplary form and with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a web using the fabric of the invention in one of the layers; Fipara 2 is a schematic illustration of one embodiment of the fabric of the invention; Figure 3 is a failure of the accumulation order of a tissue mode of the invention; Figure 4 is a pattern for the first embodiment of the fabric of the invention; Figure 5 is a pattern for the second embodiment of the fabric layer of the invention; and Figure 6 is an illustration of the surface view of the fabric of the invention.

Detailed Description of the Invention Figure 1 illustrates a band 3 of three layers, which employs the fabric of the invention. The length of the band 10 extends in the longitudinal direction L of the band, while the width of the band 10 extends in the transverse direction T of the band. This band 10 has a first outer layer 12 of fabric, a second outer layer 14 of fabric and an inner layer 16 of fabric. Interposed between the layers of fabrics, 12, 14, 16, are the layers of foam rubber 18, 20. To the outside of each outer layer, 12, 14, of fabric, there is a cover layer, 22, 24, of rubber. The relative thickness of the layers 12, 14, 16 is for illustrative purposes only. In each fabric layer, the warp yarns extend in the longitudinal direction L of the web, while the weft yarns extend in the transverse direction T. The outer layers, 12, 14, of the web 10, are woven fabrics . Nylon yarns are preferred for the outer layers, 12, 14, of the belt, to supply the belt with the desired characteristics of high impact energy absorption, high splice strength, low modulus for high bending fatigue and the ability to run on pulleys of relatively small diameter. Additionally, the use of nylon in the outer layers 12, 14, of multi-layered webs, provides a superior holding capacity. Other low modulus materials, such as conventional mixed polyester / nylon fabrics, can be used for the layers 12, 14. To adapt and / or increase the transverse load bearing capabilities of the transport band 10, the yarns of Weft of the outer layers, 12, 14 can be formed with monofilaments for the weft yarns. For greater adaptation of the properties, the selective replacement of the weft yarns with monofilaments can be achieved where only some of the weft yarns are replaced with monofilaments. The central layer 16 of the multilayer web 10 is constructed with the composite fabric 26 of the invention; the fabric 26 is illustrated in Figures 2-6. As seen in Figure 2, which illustrates a first embodiment of the fabric of the invention, this fabric 26 is a composite of woven layers, upper and lower, combined with intermediate straight warp threads, linked together with ligating threads. The individual threads and layers are also illustrated in Figures 3 and 4. Each woven layer, 28, 30, is defined by a set of four repeating weft threads, 1-W4 or W5-8, with the warp threads B, C or J, K, which intertwine the weft threads W1-W4 or W5-W8 in a twill pattern. Each woven layer, 28, 30, by itself, appears as a loose twill weave (see also Figure 6). Between each woven layer, 28, 30, there are straight warp yarns A, D, I or L. The joining of two woven layers, 28, 30, and the straight warp yarns A, D, IL together is by at least one series of ligature wires EH, MP. Each ligature yarn EH, MP extends from a first woven layer, 28 or 30, to another woven layer, 30 or 28. To prepare the two woven layers, 28, 30, the straight warp yarns A, D, I, L, and the ligature yarns EH, MP, as a composite fabric, this fabric is woven in the following order, as illustrated in Figures 2 to 4. The warp yarns W1-W4 and 5-W8 of each woven layer 28, 30, are placed in adjacent layers. A first straight warp yarn A is placed between the weft yarns W1-S8. The warp yarns B, C are woven around the weft yarns W1-W4, in a twill-type pattern, which forms the first woven layer 28. A second straight warp yarn D is placed between the weft yarns W1- W8. A set of four E-H link yarns are woven between the weft yarns W1-W8. Each EH garter thread extends from around only one weft thread in a woven first layer 28 or 30 or only one weft thread in a second woven layer 30 or 28. A third straight warp thread I is placed between the threads of plot l-W8. The warp yarns J, K are woven around the weft yarns 5-W8, in a twill-type pattern, which forms the second woven layer 30. A fourth straight warp yarn L is placed between the weft yarns WI- W8. A set of four M-P link yarns are woven between the weft yarns W1-W8 similar to the first set of E-H link yarns. Figure 6 is illustrative of the surface view of the fabric 26. The straight warp yarns 32 are seen through the warp twill weave 34 and the weft yarns 36 of a first woven layer 28 or 30. The warp threads 38 they extend along the warp yarns 34 and the straight warp yarns 32. The reinforcement fabric of the invention can also be produced using less straight warp yarns and yarns of the knit 38, compared to the first described mode. Figure 5 illustrates a tissue pattern of the second modality 26 'of the tissue of the invention. Similar to the first embodiment, the fabric 26 'is composed of two woven layers, with intermediate straight warp yarns, but with fewer straight warp yarns and fewer ligature threads. However, even with the decrease in the number of tie yarns 38, in the fabric 26 ', the total numbers of straight and surface warp yarns per linear centimeter are identical for the two fabric modes 26 and 26'. The pattern project for fabrics 26 and 26 'may also be modified to provide less than the two illustrated intermediate straight warp yarns or more than the four intermediate intermediate warp yarns illustrated. The number of intermediate straight yarns is dependent on the diameter of the yarn rope, the type of the material used and the desired physical properties of the fabric. The diameters of the strands for the strands of the straight warp 32 and the woven warp 34 are in the range of 1 to 4 mm, preferably 1.5 to 3.5 mm. The ratio of the cord diameter of the straight warp yarns 32 to the cord diameter of the woven warp yarns 34 is from 1.25 to 0.75, preferably from 1.10 to 0.90. The weft threads 36 and weft 38 have a diameter approximately equal to 1.0 to 0.25 times the diameter of the straight warp yarns 32 and woven warp 34.

Due to the diameter ratios of the straight warp 32 and woven warp 34 yarns, the relative denier resistance of the yarns, and the pattern of the weave pattern, each distinct layer in the composite fabric, the two woven layers 28, 30 and the third layer formed by the straight warp yarns contribute significantly to the physical properties of the fabric 26, 26 '. Each layer contributes approximately 25 to 40% of the overall fabric strength 26, 26 '. To increase the cross-sectional properties of the fabric of the invention, any fabric modality 26 or 26 'can be modified in the following manner. The weft yarns W1-W8, WW1-W8 of each woven layer 28, 30, can be selectively replaced with monofilaments. The content of the monofilament of each woven layer 28, 30 may vary from 10 to 75%. For the content of monofilament yarn of 25%,. every four weft yarn, ie each Wl or WW1, and each W8 or WW8, is a monofilament, while the rest of the weft yarns are spun or filament. For a content of monofilament yarn of 33%, each third weft yarn is a monofilament, while the remaining weft yarns are yarn or filament yarns. The fabric 26 formed with monofilaments, in this way, are useful when constructing a single-ply web, with the fabric 26 as a single reinforcing element. Exemplary constructions of the tissue of the invention are given below.

Example 1 A fabric 26 was woven according to the first embodiment, employing the construction of Figure 4, to produce a fabric layer of 230.43 kg per cm. The following are the specifications of the threads: Table 1 * the alternating ends of the warp thread are twisted in reverse, ie S Z S Z ...

Example 2 A fabric was woven according to the second embodiment, using the construction of Figure 5, to produce a fabric layer of 460.86 kg per cm. The following are the specifications of the threads: Table 2 To increase the strength of the fabric 26, 26 ', the denier, number of layers, as well as the type of fiber, can be varied. Also, as discussed above, the selective filling of the monofilament yarns for the weft yarns can be achieved, as described in Examples 3 and 4. «• feütattrittia Example 3 A fabric 26 was woven, according to the first embodiment, which employs the construction of Figure 4, with each fourth weft yarn of the woven layers, 28, 30 being a monofilament yarn. The resulting fabric is a cloth layer of 345.64 kg per cm. The following are the specifications for the threads: Table 1 * the alternating ends of the warp thread are twisted in reverse, ie S Z S Z ...

Example 4 A fabric was woven, according to the first embodiment, which employs the construction of Figure 4, with every third weft yarn of the woven layers 28, 30 being a monofilament yarn. The resulting fabric is a cloth layer of 345.64 kg per cm. The following are the specifications for the threads: Table 4 * the alternating ends of the warp thread are twisted in reverse, ie S Z S Z ...

Each example employs a combination of polyester and nylon yarns, for the fabric 26, 26 '- Any conventional yarn APRA can be selected to form the fabric 26, 26', which includes, but is not limited to those of aramid, polyester, nylon and nylon / polyester blends. Fabrics 26, 26 'may be used in multilayer strips 10, as illustrated in Figure 1, or in single layer strips (not shown). When the fabric 26 is used in a multilayer web 10, this web 26 forms at least one core layer and supplies the web with 50 to 75% of the web's overall strength. The outer layers 12, 14 provide 25 to 50% of the overall strength of the band. Such multilayer webs 10 are useful in all applications of heavy duty webs. Examples of such applications are in coal mines, hard rock mines (copper, gold), taconite, sand and gravel. The multilayer web with the fabric of the invention, as this at least one core layer, provides a longer life, due to the superior properties of the web. To increase the load capacity of the multilayer webs 10, for heavy duty, while retaining 50 to 75% of the web strength in the core layers, constructed in accordance with the fabric constructions of the invention, the resistors of each layer can vary as can the number of layers. The following Table 5 shows multiple examples of framework structures of the multilayer webs, where the core layers are constructed in accordance with the present invention: Table 5 As previously noted, the fabric of the invention can be used as the sole reinforcement element within a band. Such a single layer band has applications in such fields as bales for packing hay and other agricultural applications, as well as applications of light industrial transport bands, which include PVC bands.

Variations of the present invention are possible in light of the description provided. While certain representative embodiments and details have been shown for purposes of illustration of the present invention, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the present invention. Therefore, it will be understood that the changes made in the particular embodiments described are within the full attempted scope of the invention, as defined in the following appended claims.

Claims (10)

1. CLAIMS 1. A band, comprising at least one layer of fabric, this layer is a composite fabric, comprising a first and second woven layers, and a third layer, comprising a plurality of straight warp yarns, located between the first and second layer, this fabric or fabric is characterized because: each woven layer and the third layer, contribute with 25 to 40% of the general strength of the fabric.
2. 2. A. band, according to claim 1, wherein each woven layer and the third layer contribute substantially equal to the overall strength of the fabric.
3. 3. A band, according to claim 1, further comprising at least one layer of fabric, provided on the upper side of the fabric layer and at least one layer of fabric provided on the lower side of this fabric layer.
4. . A band, according to claim 1 or 3, wherein the web comprises at least two layers of reinforcement of the fabric layer.
5. 5. A band, according to claim 3, wherein the web layer supplies the web with 50 to 75% of the web's overall strength.
6. 6. A band, according to claim 1, in which the straight warp yarns have a cord diameter of 1 to 4 mm.
7. 7. A band, according to claim 1, in which the first and second woven layers and the straight warp yarns of the third layer are interconnected by a plurality of ligating threads.
8. 8. A band, according to claim 1, in which the first and second layers are comprised of warp and weft yarns, woven in a twill-type pattern.
9. 9. A band, according to claim 8, wherein from 10 to 75% of the weft threads are monofilament cords.
10. 10. A band, according to claim 1, wherein the warp, weft and straight warp yarns are selected from the group of polyester, nylon, nylon / polyester blends, and aramid. SUMMARY OF THE INVENTION A band (10) reinforced with at least one layer of fabric (16) is disclosed. This fabric layer (16) is a composite fabric (26). The fabric (26) has two woven layers (28, 30) and a third intermediate layer of straight warp yarns (34). The woven layers (28, 30) and the straight warp yarns (34) are joined to each other by means of a plurality of ligating threads (38). Each layer (28, 30, 34 of the fabric (26) substantially contributes to the overall strength of the fabric (26). (26) can be used in multilayer (10) bands, for heavy duty applications; in which the fabric layer (26) is the central layer (16) and supplies approximately 50 to 75% of the overall strength of the band. This fabric (26) can also be used as a single layer of reinforcement for bands of light duty applications.