JP2011195301A - 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 suppresses an improvement in endless processing property and the disturbance and edge damage of the weft thereof during the manufacture while securing an appropriate trough property by reducing the density of the arrangement of the weft, and also to provide the fiber-reinforced layer for a conveyor belt.SOLUTION: In this fiber-reinforced layer, the density of the arrangement of the weft 3 is 5-15 pieces/5 cm, the cover factor of the weft 3 is 300-450, the cover factor of the fiber-reinforced layer 1 is 3,300 or less, the fineness of the weft 3 is 400-1,400 dtex, and the lateral both ends of the fiber-reinforced layer 1 are formed in a tack-in structure. When a heat treatment is performed while the fiber-reinforced layer 1 is fed in the warp direction after being dipped in an adhesive liquid, the lateral both ends of the fiber-reinforced layer 1 formed in the tack-in structure are held by clamps 8, a tension of 0.035 cN/dtex or below is applied thereto in the warp direction, and the movement of the fiber-reinforced layer 1 in the weft 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 endless processability is improved and produced while reducing the weft disposition density to ensure an appropriate trough. The present invention relates to a method for manufacturing a fiber reinforced layer for a conveyor belt and a fiber reinforced layer for a conveyor belt that can suppress the disturbance of the weft and the ear cracks.

  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, the trough property can be improved by reducing the weft disposition density to reduce the lateral rigidity to some extent. However, if the arrangement density of the weft yarns is reduced, the warp yarns are likely to be loosened, resulting in a problem that endless workability is deteriorated. In addition, when heat-treating the fiber reinforcement layer dipped in the adhesive liquid, if the processing is performed while feeding the tension in only the warp direction with the weft direction free, and feeding the fiber reinforcement layer in the warp direction, Disturbance occurs. If the weft is disturbed, the tensile properties, durability, etc. will change and the quality will vary, causing adverse effects.

  Accordingly, if the processing is performed while the fiber reinforcing layer is fed in the warp direction while the tension is not substantially applied in the warp direction and the movement in the weft direction is restricted, it is possible to suppress the disturbance of the weft. In this method, it is necessary to hold both ends in the width direction of the fiber reinforcement layer with clamps or the like in order to restrain the movement in the weft direction. For this reason, a new problem arises that the warp yarns are spaced apart at the both ends in the width direction of the held fiber reinforcement layer (ear cracks).

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

  An object of the present invention is to provide a method for producing a fiber reinforced layer for a conveyor belt capable of improving the endless processability and suppressing the disturbance of the weft and the cracking at the time of manufacture while reducing the arrangement density of the weft and securing an appropriate trough property. And providing a fiber reinforced layer for conveyor belts.

  In order to achieve the above object, a method for producing a fiber reinforced layer for a conveyor belt according to the present invention is a method for producing a fiber reinforced layer for a conveyor belt having a plain weave structure in which weft yarns are arranged at a density of 5 to 15 pieces / 5 cm. The cover factor of the fiber reinforcement layer is set to 300 to 450, the cover factor of the fiber reinforcement layer is set to 3300 or less, the fineness of the weft yarn is set to 400 to 1400 dtex, and the end portion of the weft yarn is the fiber reinforcement layer at both ends in the width direction of the fiber reinforcement layer. The tuck-in structure is folded back into the tuck-in structure, and both ends in the width direction of the tuck-in-structured fiber reinforcement layer are retained when heat treatment is performed while the fiber reinforcement layer is dipped in the adhesive liquid and then sent in the warp direction. In this state, a tension of 0.035 cN / dtex or less is applied in the warp direction, and the weft direction restrains the movement of the fiber reinforcement layer. By performing the processing in the state of Rudake, characterized by a bending weft fiber reinforced layer after heat treatment 0 to 0.5%.

  Here, for example, when the heat treatment is performed, the folded portions of the tack-in structure at both ends in the width direction of the fiber reinforcement layer are held by clamps that move in the warp direction, so that the weft direction restrains the movement of the fiber reinforcement layer. Just make it.

  The fiber reinforced layer for a conveyor belt according to the present invention is a fiber reinforced layer for a conveyor belt in which the weft density of a plain woven fiber reinforced layer embedded in the conveyor belt is 5 to 15/5 cm. The factor is 300 to 450, the cover factor of the fiber reinforcement layer is 3300 or less, the fineness of the weft yarn is 400 to 1400 dtex, and the end portion of the weft yarn is folded and knitted inside the fiber reinforcement layer at both ends in the width direction. It has a tuck-in structure, and is characterized in that the fabric bend after dipping in an adhesive solution and heat treatment is 0 to 0.5%.

  The width of the folded portion of the tuck-in structure is, for example, 1 cm to 3 cm.

  According to the present invention, the arrangement density of the weft yarn in the fiber reinforcement layer is relatively small as 5 to 15/5 cm, which contributes to the reduction of the lateral stiffness in the conveyor belt, and further the cover factor of the weft yarn is 300 to By setting the cover factor of the fiber reinforcement layer to 3300 or less and the fineness of the weft yarn to 400 to 1400 dtex, the appropriate trough property can be obtained. In addition, by having a tuck-in structure at both ends in the width direction of the fiber reinforcement layer, when performing heat treatment while feeding the fiber reinforcement layer dipped in the adhesive liquid in the warp direction, the both ends in the width direction are held with clamps or the like. Even if the movement in the weft direction is constrained, ear cracks are less likely to occur. In this way, the movement of the fiber reinforcement layer in the weft direction can be sufficiently restricted, so that the weft yarn is prevented from being disturbed, and the fabric bending of the fiber reinforcement layer after the heat treatment can be made 0 to 0.5%.

  Furthermore, by adopting the tuck-in structure, the warp yarns are supported by the weft yarns at both ends in the width direction of the fiber reinforcement layer, and it becomes difficult to separate them. Therefore, the endless workability can be improved while the weft arrangement density is small.

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 top view of the fiber reinforcement layer of FIG. It is explanatory drawing which illustrates the twist structure of the warp which comprises a fiber reinforcement layer. It is explanatory drawing which illustrates the heat processing process after dipping a fiber reinforcement layer in adhesive liquid. 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 arrangement density of the weft 3 is 5 to 15 / cm, and is set to a relatively small density. Therefore, if this fiber reinforcing layer 1 is used, it contributes to a reduction in the lateral rigidity of the conveyor belt 6. Therefore, in the case of a pipe conveyor belt, it is easily deformed so as to fit the carrier roller. It becomes easy to deform so that it may become familiar with the guide pipe which holds.

  Further, the cover factor of the weft 3 is 300 to 450, the cover factor of the fiber reinforcement layer 1 is 3300 or less, and the fineness of the weft 3 is 400 to 1400 dtex. The cover factor and the fineness of the weft 3 are set within the above range, and the arrangement density of the weft 3 is set to 5 to 15 / cm, so that the fiber reinforced layer 1 can be used as a surface and the specification can be kept to a certain extent, and an appropriate trough property can be obtained. Can be obtained.

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

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.

  Further, both ends in the width direction of the fiber reinforcement layer 1 are knitted with the leading end 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.

  At both ends in the width direction of the fiber reinforcement layer 1, the warp yarns 2 are more reliably supported by the weft yarns 3 that are folded back and knitted, so that the warp yarns 2 are not easily separated. Therefore, the endless workability can be improved while the arrangement density of the wefts 3 is small.

  The width W of the folded portion B is, for example, about 1 cm to 5 cm, preferably 1 cm to 3 cm. When the width W of the folded portion B is less than 1 cm, the effect of preventing warp 2 from being scattered and the effect of preventing ear cracks during heat treatment are too small. On the other hand, even if the width W exceeds 5 cm, these additional effects are small and the weight is increased.

  The fiber reinforcing layer 1 is dipped in an adhesive and then heat treated. The fabric bending of the fiber reinforced layer 1 after the heat treatment is 0 to 0.5%. The cloth bending is a cloth bending (%) measured by a method defined in JIS L 1096. That is, the weft 3 is arranged so as to be orthogonal to the warp 2 and the state of disturbance is very small. When the weft 3 is disturbed, the tensile properties and durability of the fiber reinforcing layer 1 (and consequently the conveyor belt 6) change, and the quality varies, resulting in adverse effects. Quality can be ensured.

  As the warp 2 and the weft 3, for example, those formed of various synthetic fibers such as polyester, polyketone, aramid, vinylon, and nylon can be used.

  For example, as shown in FIG. 3, the warp yarn 2 is a twisted structure in which a plurality of filament yarns 2a are respectively twisted one by one in the same direction, and then the filament yarns 2a are twisted in the opposite direction. To. 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 and fatigue resistance than 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 preferably 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, by setting the upper twist coefficient K in the range of 1000 or more and 2400 or less, it is possible to improve buckling resistance and fatigue resistance while suppressing a decrease in strength of the fiber reinforcing layer 1.

  Moreover, in order to adjust trough property moderately, it is good to make the weft direction intensity | strength of the fiber reinforcement layer 1 into about 150-350 N / cm. The weft direction strength is a 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.

  As illustrated in FIG. 5, the conveyor belt 6 is stretched between pulleys 7 and used. 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 reinforcement layer 1 that employs fibers having the above-described various twist structures and an upper twist coefficient K of 1000 or more and 2400 or less may be applied only to the innermost fiber reinforcement layer 1a. . Alternatively, the fiber reinforcing layer 1 may be applied to at least one innermost fiber reinforcing layer 1a.

  The procedure for producing the fiber reinforcing layer 1 according to the present invention is as follows.

  After the fiber reinforcement layer 1 having the tuck-in structure at both ends in the width direction is dipped in the adhesive liquid, a predetermined heat treatment is performed while feeding it in the warp direction. This heat treatment includes, for example, a dry process 10 and a baking process 11 shown in FIG.

  When the heat treatment of the fiber reinforcement layer 1 is performed, a very low tension of 0.035 cN / dtex or less is applied in the warp direction. Both ends (folded portions B) in the width 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 and moving in the warp direction. 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.

  In addition, 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 weft direction is the direction of the fiber reinforcing layer 1. As long as it is a device that can only restrain the movement, a device of another structure and style 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. Thus, the fiber reinforcement layer 1 which heat-processed is manufactured. Next, the fiber reinforced layer 1 after the 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, since the movement of the fiber reinforcement layer 1 in the weft direction is restricted by the holding of the clamp 8 during the heat treatment, the disturbance of the weft 3 (disturbance in the warp direction) is suppressed. Therefore, it becomes possible to make the fabric bending of the fiber reinforcement layer 1 after heat treatment 0 to 0.5%. Therefore, variations in quality such as tensile characteristics and durability of the conveyor belt 6 are reduced, and it is easy to ensure stable quality.

  Moreover, the arrangement density of the wefts 3 is increased by providing the folded portions B at both ends in the width direction of the fiber reinforcing layer 1. Therefore, even if both ends are held by the clamps 8, it is possible to reliably prevent a problem that the warp yarns 2 are scattered at both ends in the width direction of the fiber reinforcement layer 1, so-called ear cracks.

  The weft yarn of the fiber reinforced layer of the plain weave structure is made common as nylon 66 fiber, and the load condition of the tension in the heat treatment after dipping in the adhesive liquid is 0.035 cN / dtex or less in the warp yarn direction, the fiber yarn layer in the weft direction 8 types of test samples (Examples 1 to 5 and Comparative Examples 1 to 3) having different specifications as shown in Table 1 are prepared in a state that only restricts the movement of each test sample. Samples of the conveyor belt having the upper rubber layer (3 mm) and the lower rubber layer (2 mm) were prepared by making these test samples into four layers, and the troughability and endless workability were evaluated. . The results are as shown in Table 1. The heat treatment conditions were a dry process (130 ° C.) and a baking process (220 ° C.).

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

[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 ×.

[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”.

[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 5 produced by the production method of the present invention, the fabric is less bent and the quality is excellent with no ear cracks. Moreover, in Examples 1-5, it turns out that trough property 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 (4)

  A method of manufacturing a fiber reinforced layer for a conveyor belt having a plain weave structure in which wefts are arranged at a density of 5 to 15 pieces / 5 cm. The cover factor of the weft yarn is set to 300 to 450, and the cover factor of the fiber reinforced layer is 3300 or less. The weft yarn has a fineness of 400 to 1400 dtex, and a tuck-in structure is formed by folding and weaving the end portion of the weft yarn inside the fiber reinforcement layer at both ends in the width direction of the fiber reinforcement layer. When the heat treatment is carried out while being fed in the warp direction after being dipped in, a tension of 0.035 cN / dtex or less is applied in the warp direction while holding both ends in the width direction of the fiber reinforcing layer having a tuck-in structure. The weft direction is only to restrain the movement of the fiber reinforcement layer, so that the fabric of the fiber reinforcement layer after heat treatment is processed. Method of manufacturing a conveyor belt fibrous reinforcement layer which the rising to 0 to 0.5%.   When the heat treatment is performed, the folded portions of the tuck-in structure at both ends in the width direction of the fiber reinforcement layer are held by clamps that move in the warp direction, so that the weft direction only restrains the movement of the fiber reinforcement layer. The manufacturing method of the fiber reinforcement layer for conveyor belts of Claim 1.   A fiber reinforced layer for a conveyor belt in which the weft density of a fiber reinforced layer of a plain weave structure embedded in a conveyor belt is 5 to 15/5 cm, and the cover factor of the weft is 300 to 450, and the cover of the fiber reinforced layer The factor is 3300 or less, the fineness of the weft is 400 to 1400 dtex, and has a tuck-in structure in which the front end of the weft is folded and knitted inside the fiber reinforcement layer at both ends in the width direction, and is dipped in the adhesive liquid. A fiber reinforced layer for conveyor belts in which the fabric bend after heat treatment is 0 to 0.5%.   The fiber reinforcing layer for a conveyor belt according to claim 3, wherein a width of the folded portion of the tuck-in structure is 1 cm to 3 cm.

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