JP2011195300A - Method of manufacturing fiber-reinforced layer for conveyor belt and fiber-reinforced layer for conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a fiber-reinforced layer for a conveyor belt, which prevents the weft from being disturbed by securing superior trough property and buckling resistance to increase the strength thereof in the warp direction, and also to provide the fiber-reinforced layer for a conveyor belt.SOLUTION: This fiber-reinforced layer 1 is formed in a ply structure using polyketone fibers for the warp 2 thereof. Where the fineness of the warp 2 is D1 (dtex) and the number of upper strands is T (turns/10 cm), an upper stand factor K=TxD1is 1,000 to 2,400. The weft 3 of the fiber-reinforced layer is disposed in a density of 5-15 pieces/5 cm. The strength of the fiber-reinforced layer 1 in the weft direction is 150-350 N/cm. In the heat treatment of the fiber-reinforced layer 1 dipped in an adhesive liquid, a tension of 0.035 cN/dtex or below is applied thereto in the warp direction, the lateral both ends thereof are held by clamps 8, and the movement thereof in the warp direction is restrained, whereby the bending of the texture thereof after the heat treatment is 0-0.5%.

Description

  The present invention relates to a method for producing a fiber reinforced layer for a conveyor belt and a fiber reinforced layer for a conveyor belt. More specifically, the present invention secures excellent troughing and buckling resistance, and improves strength in the warp direction. The present invention relates to a method for producing a fiber reinforced layer for a conveyor belt capable of preventing disturbance and a fiber reinforced layer for a conveyor belt.

  As the core material of the conveyor belt, generally, a single or a plurality of laminated fiber reinforced layers having a plain weave structure are used, and various specifications of the fiber reinforced layers have been proposed (for example, see Patent Documents 1 and 2). . Plain woven structure fiber reinforced layers are also used in conveyor belts that require strong deformation (troughing) properties to adapt to carrier rollers such as pipe conveyor belts and air levitation conveyor belts and guide pipes that hold the outside. It has been.

  In the case of a fiber reinforced layer having a plain weave structure, troughability can be improved by reducing the weft disposition density or the weft fineness to reduce the lateral stiffness to some extent. However, when such measures are taken, the crimp (up and down bending) of the warp yarn becomes small, which causes a problem that the buckling resistance deteriorates. Further, since the fiber reinforcing layer is inferior in strength in the longitudinal direction (warp direction) as compared with the steel cord reinforcing layer, improvement thereof has been desired.

  Furthermore, the fiber reinforcing layer generally has a problem that the weft yarn is disturbed during the heat treatment after being dipped in the adhesive liquid, because a tension is generally applied in the warp direction and the weft direction is completely free. there were. If the weft is disturbed, the tensile properties, durability, etc. will change and the quality will vary, causing adverse effects.

JP-A-11-246018 JP 2006-282299 A

  An object of the present invention is to provide a fiber reinforced layer for a conveyor belt and a fiber reinforced layer for a conveyor belt, which can ensure excellent trough and buckling resistance, improve strength in the warp direction, and prevent disturbance of the weft. Is to provide.

In order to achieve the above object, the method for producing a fiber reinforced layer for a conveyor belt according to the present invention is such that a warp yarn of a fiber reinforced layer having a plain weave structure is twisted in one or more filament yarns in the same direction, and then When the twisted yarns are combined and twisted in the opposite direction to form various twisted structures, the warp yarn fineness D1 (dtex) and warp yarn upper twist number T (times / 10 cm) are expressed by the following formula (1) Conveyor in which the upper twist coefficient K calculated by the above is set to 1000 to 2400, the wefts of the fiber reinforcement layer are arranged at a density of 5 to 15 pieces / 5 cm, and the strength in the weft direction of the fiber reinforcement layer is 150 to 350 N / cm A method for producing a fiber reinforced layer for a belt, wherein a polyketone fiber is used for the warp, and when heat-treating the fiber reinforced layer dipped in an adhesive solution, 0.03 in the warp direction of the fiber reinforced layer. By applying a tension of cN / dtex or less and performing the treatment in a state in which the weft direction only restrains the movement of the fiber reinforcing layer, the fabric bending of the fiber reinforcing layer after heat treatment is reduced to 0 to 0.5%. It is characterized by doing.
K = T × D1 ^1/2 (1)

  Here, the cover factor of the weft yarn is 300 to 450, the cover factor of the fiber reinforcement layer is 3300 or less, the fineness D2 of the weft yarn is 400 to 1400 dtex, and before the fiber reinforcement layer is dipped in the adhesive liquid, A tuck-in structure can also be obtained by folding and weaving the tip portion of the weft yarn inside the fiber reinforcement layer at both ends in the width direction of the fiber reinforcement layer. The elastic modulus of the polyketone fiber at an atmospheric temperature of 25 ° C. is, for example, 200 to 1000 cN / dtex, and the dry heat shrinkage rate of 160 ° C. × 30 minutes is, for example, 0.2 to 1.0%.

The fiber reinforced layer for a conveyor belt according to the present invention is a yarn in which warp yarns of a plain woven fiber reinforced layer embedded in a conveyor belt are twisted one or more filament yarns in the same direction, and then these twisted yarns. The twisted structure is twisted in the opposite direction and the twist is calculated by the following equation (1) when the warp yarn fineness D1 (dtex) and warp yarn twist T (times / 10 cm) are used. The fiber reinforcement for conveyor belts has an upper twist coefficient K of 1000 to 2400, a weft density of the fiber reinforcement layer of 5 to 15 pieces / 5 cm, and a weft direction strength of the fiber reinforcement layer of 150 to 350 N / cm. The warp yarn is a polyketone fiber, and the fabric bending after heat treatment of the fiber reinforcing layer dipped in the adhesive liquid is 0 to 0.5%.
K = T × D1 ^1/2 (1)

  Here, the cover factor of the weft is 300 to 450, the cover factor of the fiber reinforcement layer is 3300 or less, the fineness D2 of the weft is 400 to 1400 dtex, and both ends in the width direction of the fiber reinforcement layer are It can also be set as the specification which is the tuck-in structure where the front-end | tip part of the said weft was folded and knitted inside the fiber reinforcement layer. The elastic modulus of the polyketone fiber at an atmospheric temperature of 25 ° C. is, for example, 200 to 1000 cN / dtex, and the dry heat shrinkage rate of 160 ° C. × 30 minutes is, for example, 0.2 to 1.0%.

  According to the present invention, the arrangement density of the weft yarn in the fiber reinforcement layer is 5 to 15/5 cm, and the strength in the weft direction of the fiber reinforcement layer is 150 to 350 N / cm. Obtainable.

  In addition, while the arrangement density of the weft yarns is relatively small as described above, a polyketone fiber having high elastic modulus and high strength characteristics is used for the warp yarns, and a twisted structure is obtained. Since the upper twist coefficient K of the warp yarn is set to an appropriate range (K = 1000 to 2400), the strength in the warp direction and the buckling resistance of the fiber reinforcement layer can be improved.

  Further, when heat-treating the fiber reinforcement layer dipped in the adhesive liquid, a tension of 0.035 cN / dtex or less is applied in the warp direction of the fiber reinforcement layer, and the weft direction only restrains the movement of the fiber reinforcement layer. By performing the treatment in this state, the warp of the weft yarn is suppressed by setting the fabric bending of the fiber reinforcement layer after the heat treatment to 0 to 0.5%.

It is sectional drawing which illustrates the fiber reinforcement layer for conveyor belts of this invention currently embed | buried under the conveyor belt. It is a perspective view which illustrates the conveyor belt of FIG. It is explanatory drawing which illustrates the twist structure of the warp which comprises the fiber reinforcement layer of this invention. It is explanatory drawing which illustrates the heat processing process after dipping the fiber reinforcement layer of this invention to adhesive liquid. It is a top view which illustrates another embodiment of the fiber reinforcement layer of this invention. It is a side view which illustrates the state where the conveyor belt was stretched between pulleys.

  Hereinafter, the manufacturing method of the fiber reinforcement layer for conveyor belts of this invention and the fiber reinforcement layer for conveyor belts are demonstrated based on embodiment shown in the figure.

  As illustrated in FIGS. 1 and 2, the fiber reinforced layer 1 (1 a, 1 b, 1 c, 1 d) for the conveyor belt of the present invention has a conveyor belt 6 as a core between the upper rubber layer 4 and the lower rubber layer 5. It is buried in. The number of laminated fiber reinforced layers 1 is determined by the required performance (rigidity, elongation, etc.) for the conveyor belt 6 and is not limited to four layers, but may be a single layer or other plural layers. These fiber reinforcement layers 1a, 1b, 1c, and 1d have a plain weave structure in which warp yarns 2 extending in the belt longitudinal direction and weft yarns 3 extending in the belt width direction alternately intersect vertically, and all the layers have the same specifications. ing.

  The warp yarn 2 constituting the fiber reinforcement layer 1 is formed of polyketone fibers. The modulus of elasticity of the polyketone fiber when the ambient temperature is 25 ° C. is, for example, 200 to 1000 cN / dtex, and the dry heat shrinkage rate of 160 ° C. × 30 minutes (heating at 160 ° C. for 30 minutes) is, for example, 0.2 to 1.0. %. More preferably, the elastic modulus is 300 to 500 cN / dtex, and the dry heat shrinkage is 0.4 to 0.7%. The dry heat shrinkage rate is a value measured according to JIS L 1013. By using the polyketone fiber, the strength of the fiber reinforcing layer 1 in the warp direction is improved. The weft 3 is formed of resin fibers such as polyester, polyketone, aramid, vinylon, nylon, and the like.

  As illustrated in FIG. 3, the warp yarn 2 has a twisted structure in which a plurality of filament yarns 2a are respectively twisted one by one in the same direction, and then these filament yarns 2a are combined and twisted in opposite directions. It has become. The number of filament yarns 2a to be twisted is not limited to one, and a plurality of filament yarns 2a may be twisted in the same direction. Further, it is sufficient that the number of yarns to be twisted is plural.

  The warp yarn 2 having a multiple twist structure can obtain better buckling resistance as compared with a single twist structure in which one or a plurality of filament yarns are aligned and twisted in one direction. Although the lower twist and the upper twist may be different, the same number or approximately the same number is preferable in order to obtain stability.

Here, regarding the upper twist, when the fineness D1 (dtex) of the warp yarn 2 and the upper twist number T (times / 10 cm) of the warp yarn 2 are set, the upper twist coefficient K calculated by K = T × D1 ^1/2 Is set to 1000 to 2400. As the upper twist coefficient K increases, the tensile strength of the warp 2 decreases and the buckling resistance improves. Therefore, in the present invention, the buckling resistance is further improved while setting the upper twist coefficient K in the range of 1000 or more and 2400 or less to suppress the strength reduction of the fiber reinforcement layer 1.

  Furthermore, the arrangement density of the weft yarns 3 in the fiber reinforcement layer 1 is 5 to 15/5 cm, and the strength in the weft direction of the fiber reinforcement layer 1 is 150 to 350 N / cm. The strength in the weft direction is the breaking strength when the fiber reinforcement layer 1 is pulled in the weft direction, and is obtained by a tensile test method based on the label strip method described in JIS L 1096.

  By setting the arrangement density of the wefts 3 and the strength in the weft direction of the fiber reinforcing layer 1 within the above ranges, the lateral rigidity of the conveyor belt 6 becomes an appropriate size. As a result, in the case of a pipe conveyor belt, it becomes easy to deform so as to adapt to the carrier roller, and in the case of an air floating type conveyor belt, it becomes easy to deform so as to adapt to the guide pipe that holds the outside of the belt, and good trough property is achieved. Obtainable.

  The fiber reinforcement layer 1 is heat treated after being dipped in an adhesive solution. This heat treatment includes, for example, a dry process and a baking process described later. The fabric bending of the fiber reinforcement layer 1 after this heat treatment is 0 to 0.5%. The cloth bending is a cloth bending (%) measured by a method defined in JIS L 1096.

  The conveyor belt 6 is stretched between pulleys 7 as illustrated in FIG. When the conveyor belt 6 passes around the pulley 7, the maximum compressive stress is generated in the innermost fiber reinforcing layer 1 a in the fiber reinforcing layer 1, so that it is most easily buckled. Therefore, the fiber reinforcing layer 1 of the present invention may be applied only to the innermost fiber reinforcing layer 1a. Alternatively, the fiber reinforcing layer 1 of the present invention may be applied to at least one innermost fiber reinforcing layer 1a.

  FIG. 5 shows another embodiment of the fiber reinforcing layer 1. Unlike this embodiment and the previous embodiment, both ends in the width direction of the fiber reinforcement layer 1 are knitted with the tip portion of the weft 3 folded back inside the fiber reinforcement layer 1. That is, it has a tuck-in structure having folded portions B of the weft 3 at both ends in the width direction. The width of the folded portion B is, for example, about 1 cm to 3 cm.

  In this embodiment, it is preferable that the cover factor of the weft yarn 3 is 300 to 450, the cover factor of the fiber reinforcement layer 1 is 3300 or less, and the fineness D2 of the weft yarn 3 is 400 to 1400 dtex. Other specifications are the same as in the previous embodiment.

The cover factor K1 of the warp yarn 2 and the cover factor K2 of the weft yarn 3 are calculated by the following equations (2) and (3).
K1 = d1 × (D1 / b1) ^1/2 (2)
K2 = d2 × (D2 / b2) ^1/2 (3)

Here, d1 and d2 are the yarn density of the warp yarn 2 and the weft yarn 3 (lines / 50 mm), D1 and D2 are the fineness (dtex) of the warp yarn 2 and the weft yarn 3, respectively, and b1 and b2 are the yarns of the warp yarn 2 and the weft yarn 3, respectively. Specific gravity (g / cm ³ ). The total value of the cover factor of the warp 2 and the cover factor of the weft 3 becomes the cover factor of the fiber reinforcement layer 1.

  The heat treatment of the fiber reinforcing layer 1 of the present invention is performed in the following procedure. When the heat treatment of the fiber reinforcement layer 1 dipped in the adhesive liquid is performed, a very low tension of 0.035 cN / dtex or less is applied in the warp direction. Both ends in the width direction (both ends in the weft direction) of the fiber reinforcement layer 1 are held at predetermined intervals in the warp direction by clamps 8 attached to a conveying means 9 such as an endless chain. The fiber reinforcing layer 1 is not actively pulled in the weft direction by the clamp 8, and the weft direction is in a state in which the movement of the fiber reinforcing layer 1 is only restricted.

  Not only the apparatus provided with the clamp 8 described above, a very low tension of 0.035 cN / dtex or less is applied to the fiber reinforcing layer 1 in the warp direction, and the movement of the fiber reinforcing layer is determined in the weft direction. As long as the device can be in a state that only restrains the device, devices of other structures and styles can be used.

  In this state, the fiber reinforcement layer 1 is successively sent to the dry process 10 and the baking process 11 in order and processed. In the drying step 10, unnecessary components in the adhesive liquid attached to the fiber reinforcement layer 1 are evaporated by passing through an atmosphere of about 100 ° C. to 150 ° C., for example. In the baking process 11, it passes through the atmosphere of about 200 degreeC-230 degreeC, for example, and the adhesive liquid after drying is made to react and harden | cure continuously. The fiber reinforced layer 1 after heat treatment is interposed between the upper rubber layer 4 and the lower rubber layer 5 and vulcanized for a predetermined time inside the mold, whereby the conveyor belt 6 is completed.

  In the present invention, during the heat treatment of the fiber reinforcement layer 1, only a small tension of 0.035 cN / dtex or less is applied in the warp direction of the fiber reinforcement layer. However, the heat shrinkage is reduced by using polyketone fibers for the warp 2. Therefore, the disturbance of the warp yarn 2 and the weft yarn 3 is suppressed. That is, when the warp 2 having a large thermal shrinkage is used, the warp 2 around the central portion in the width direction of the fiber reinforcement layer 1 not held by the clamp 8 is freely contracted, and the weft 3 is also bent accordingly. Although this occurs, the present invention can prevent such a problem.

  And since the movement of the fiber reinforcement layer 1 is restrained in the weft direction, the disturbance of the weft 3 (disturbance in the warp direction) is suppressed. Therefore, the fabric bending of the fiber reinforced layer 1 after heat treatment is 0 to 0.5%. Therefore, variations in quality such as the tensile characteristics and durability of the conveyor belt 6 are reduced, and it becomes easy to ensure a certain level of stable quality.

  In the embodiment in which both end portions in the width direction illustrated in FIG. 5 have a tuck-in structure, the arrangement density of the weft yarns 3 at both end portions in the width direction of the fiber reinforcement layer 1 is increased by providing the folded portions B. Therefore, even if both ends of the fiber reinforcement layer 1 are held by the clamps 8 during the heat treatment, it is possible to more surely prevent a problem that the warp yarns 2 are scattered at the both ends in the width direction of the fiber reinforcement layer 1, so-called ear cracks. it can.

  The weft yarn of the fiber reinforced layer of the plain weave structure was made common as nylon 66 fiber, and the heat treatment was carried out by changing the specifications of warp yarn and the load condition of the tension in the heat treatment after dipping in the adhesive liquid as shown in Table 1. 6 Various types of test samples (Examples 1 to 3 and Comparative Examples 1 to 3) were prepared, and each test sample was bent into four layers, and these test samples were made into four layers, an upper rubber layer (3 mm) and a lower rubber layer (2 mm). Samples of conveyor belts having) were prepared and evaluated for troughability, buckling resistance, and endless workability. The results are as shown in Table 1. The heat treatment conditions were a dry process (predetermined temperature of 100 ° C. to 150 ° C.) and a baking process (predetermined temperature of 200 ° C. to 230 ° C.). The elastic modulus in Table 1 is the elastic modulus at an ambient temperature of 25 ° C., and the dry heat shrinkage is the dry heat shrinkage when heated at 160 ° C. for 30 minutes.

[Fabric bend]
This is the fabric bend (%) measured by the method defined in JIS L 1096. The smaller the value, the smaller the weft disturbance.

[Trough]
This was performed in accordance with JIS K 6322 (cloth layer conveyor belt). Fix both ends of the belt sample (width 800mm, length 150mm) in the width direction with support bars, suspend each support bar end in a state where the sample is pulled horizontally, and leave it for 24 hours. It was measured. A case where the maximum deflection amount is more than 300 mm is shown as “Good”, a case where it is more than 200 mm and less than 300 mm is regarded as Δ, and a case where it is less than 200 mm is shown as “Poor”.

[Buckling resistance]
The state of the fiber reinforcement layer laminated on the innermost peripheral side when the belt sample was wound 180 ° around a pulley having a diameter of 200 mm was confirmed. The case where the innermost fiber reinforcing layer followed along the peripheral surface of the pulley was evaluated as “◯”, and the case where the warp yarn was easily buckled without following and evaluated as “x”.

[Endless workability]
Evaluates the workability of the belt samples when joining the longitudinal ends of the belt sample. The degree of warp yarn dispersion is small and the case where the work can be performed smoothly is good. Is shown as x when the processing operation is complicated.

  From the results of Table 1, it can be seen that in Examples 1 to 3 manufactured by the manufacturing method of the present invention, the fabric bending is small and the quality is excellent. Moreover, in Examples 1-3, it turns out that trough property, buckling resistance, and endless workability are also excellent.

  Further, the warp yarn of the fiber reinforced layer of the plain weave structure is the same as the polyketone fiber in Examples 1 to 3 and Comparative Example 1, and the weft yarn is nylon 66 fiber, and the load of tension in the heat treatment after being dipped in the adhesive liquid The condition is 0.035 cN / dtex or less in the warp direction, and the weft direction is common only to restrain the movement of the fiber reinforcement layer. The cover factor of the fiber reinforcement layer and the weft, the fineness of the weft, the width direction of the fiber reinforcement layer Six types of test samples (Examples 4 to 6 and Comparative Examples 4 to 6) having different weft yarn folding structures at both ends (ear portions) as shown in Table 2 were prepared, and the ear cracks were obtained for each test sample. And a sample of the conveyor belt having the upper rubber layer (3 mm) and the lower rubber layer (2 mm) by making these test samples into four layers and producing the trough, buckling, It was evaluated dress workability. The results are as shown in Table 2. The heat treatment conditions were a dry process (130 ° C.) and a baking process (220 ° C.).

[Ear cracks]
The presence or absence of ear cracks at both ends in the width direction of the test sample after the heat treatment was confirmed, and the case where ear cracks did not occur was indicated by ○, and the case where ear cracks occurred was indicated by ×.

  From the results in Table 2, it can be seen that in Examples 4 to 6 produced by the production method of the present invention, the ear cracks can be prevented and the trough property, buckling resistance and endless workability are also excellent.

1, 1a, 1b, 1c, 1d Fiber reinforcing layer 2 Warp yarn 2a Filament yarn 3 Weft 4 Upper rubber layer 5 Lower rubber layer 6 Conveyor belt 7 Pulley 8 Clamp 9 Conveying means 10 Drying step 11 Baking step B Folding part

Claims (6)

The warp yarn of the fiber reinforced layer of the plain weave structure is twisted in the same direction one by one or more filament yarns, and then combined into a twisted structure in which these twisted yarns are combined and twisted in the opposite direction. About the fineness D1 (dtex) of the warp, and the upper twist coefficient K calculated by the following formula (1) when the upper twist number T (times / 10 cm) of the warp is 1000-2400, A method for producing a fiber reinforced layer for a conveyor belt in which wefts are arranged at a density of 5 to 15 yarns / 5 cm and the weft direction strength of the fiber reinforced layer is 150 to 350 N / cm, wherein polyketone fibers are used for the warp yarns. When the fiber reinforcement layer dipped in the adhesive solution is heat-treated, a tension of 0.035 cN / dtex or less is applied in the warp direction of the fiber reinforcement layer, and the weft direction is the movement of the fiber reinforcement layer. Method for producing by performing the process in a state of only restraint, conveyor belts textile reinforcement layer to the bend weft fiber reinforced layer after heat treatment 0 to 0.5%.
K = T × D1 ^1/2 (1)   Before the cover factor of the weft yarn is set to 300 to 450, the cover factor of the fiber reinforcement layer is set to 3300 or less, the fineness D2 of the weft yarn is set to 400 to 1400 dtex, and the fiber reinforcement layer is dipped in the adhesive liquid, the fiber reinforcement layer The manufacturing method of the fiber reinforcement layer for conveyor belts of Claim 1 which makes it a tuck-in structure by folding the front-end | tip part of the said weft inside a fiber reinforcement layer at the both ends of the width direction, and knitting.   The conveyor according to claim 1 or 2, wherein the polyketone fiber has an elastic modulus of 200 to 1000 cN / dtex at an atmospheric temperature of 25 ° C, and a dry heat shrinkage of 0.2 to 1.0% at 160 ° C for 30 minutes. A method for producing a fiber reinforcing layer for a belt. Various twists of warp yarns in a plain woven structure embedded in a conveyor belt, with one or more filament yarns twisted in the same direction, and then twisted together in the opposite direction. The upper twist coefficient K calculated by the following formula (1) is set to 1000 to 2400 when the structure is used and the upper twist is the warp fineness D1 (dtex) and the warp upper twist number T (times / 10 cm). And a fiber reinforcing layer for a conveyor belt in which the weft density of the fiber reinforcing layer is 5 to 15 pieces / 5 cm and the weft direction strength of the fiber reinforcing layer is 150 to 350 N / cm, wherein the warp is a polyketone fiber A fiber reinforced layer for a conveyor belt, wherein the fabric bend after the heat treatment of the fiber reinforced layer dipped in the adhesive liquid is 0 to 0.5%.
K = T × D1 ^1/2 (1)   The cover factor of the weft yarn is 300 to 450, the cover factor of the fiber reinforcement layer is 3300 or less, the fineness D2 of the weft yarn is 400 to 1400 dtex, and both ends in the width direction of the fiber reinforcement layer are The fiber reinforcing layer for a conveyor belt according to claim 4, which has a tuck-in structure in which a tip portion is folded and knitted inside the fiber reinforcing layer.   The conveyor according to claim 4 or 5, wherein the polyketone fiber has an elastic modulus of 200 to 1000 cN / dtex at an atmospheric temperature of 25 ° C and a dry heat shrinkage of 160 to 30 minutes of 0.2 to 1.0%. Fiber reinforcement layer for belts.

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