JP2005232630A - Net for concentrating pulp and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high durability resisting to a long-term use by suppressing the break of a net body. <P>SOLUTION: A guide part 7 installed along the edge in the width direction of the net body 6 is formed by fixing a guide part-forming body 11 comprising a nonwoven fiber assembly to the net body to regulate the position in the width direction based on the roll of the net body wound on the roll. Preferably, the guide part-forming body is obtained by impregnating the nonwoven fiber assembly with a fiber-binding material, and sticking and binding the constituent fibers of the nonwoven fiber assembly to each other by the fiber-binding material. Further preferably, a reinforced part 8 obtained by reinforcing the net body by a synthetic polymer material is installed in the inside region of the guide part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pulp concentrating net for compressing and concentrating (dehydrating) pulp, and a method for producing the same, and in particular, in order to define the width direction position of the net main body wound around the roll in an endless manner. The present invention relates to a pulp concentrating net provided with a guide portion along an edge in the width direction thereof and a manufacturing method thereof.

  In the recycling of waste paper, various processes such as disaggregation, deinking, and bleaching are performed, but in the deinking process that separates and removes foreign matter such as ink and clay from the raw paper raw material, it is wound around a roll. Pulp concentrators that squeeze and condense (dehydrate) pulp with a net are used.

  In such a pulp concentrator, the pulp is supplied as a lump of a non-uniform size on the net, so that the load balance in the entire net is lost and the net is liable to skew. Therefore, in order to suppress such skewing of the net, a structure in which a guide body that defines the position in the width direction with respect to the roll is provided along the edge in the width direction of the net is used.

As a net provided with this type of guide body, for example, a structure in which a guide body having a trapezoidal cross section that is solidly formed of a synthetic polymer material is fixed to the net body by stitching is known (Patent Document). 1). Similarly, a structure in which a guide body that is solidly formed of a synthetic polymer material is fixed to a net body by fusion is known (see Patent Documents 2 and 3).
JP-A-2-14090 JP-A-4-361682 JP-A-8-144185

  However, in the net provided with the guide body, a large bending stress is generated in the net body in the vicinity of the guide body in a state of being wound around the outer peripheral surface of the roll, and such a stress state is repeatedly generated during traveling. As a result, the strength of the fiber of the net body is reduced, and the fiber of the net body is cut and unusable after a short period of use.

  For example, in the configuration in which the guide body is fixed to the net body by stitching as described in Patent Document 1, a problem occurs in that the net of the net body is bent in the immediate vicinity of the guide body and the fibers of the net body are cut. On the other hand, in the configuration in which the anti-bending portion is provided integrally with the guide body as described in Patent Documents 2 and 3, it is possible to suppress bending of the net body in the immediate vicinity of the guide body, but reinforcement is applied. The stress concentrates on the boundary between the ground part and the anti-bending part of the mesh body that has not been done, and there is a problem that the fiber of the mesh body cuts along the boundary part, sufficiently satisfying the demand for improved durability Can not do it.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is high durability that can withstand long-term use by suppressing fiber cutting of the net body. Is to provide a pulp concentration net and a method for producing the same.

  In order to solve such a problem, in the present invention, as shown in claim 1, in order to define the position in the width direction of the net body wound around the roll relative to the roll, the edge in the width direction of the net body In the pulp concentrating net provided with the guide part, the guide part is formed by fixing a guide part forming body made of a non-woven fiber aggregate to the net body.

  According to this, the guide part forming body made of a non-woven fiber aggregate is lighter than the conventional product solidly formed of a synthetic polymer material, and has excellent flexibility and shock absorption due to the internal voids. Therefore, it is possible to reduce the load acting on the net body and suppress the fiber cut of the net body. Furthermore, by using a low-friction characteristic constituent fiber of the non-woven fiber aggregate, it is possible to achieve excellent wear resistance. For this reason, it is possible to dramatically improve the durability of the pulp concentration net.

  In this case, the guide part forming body made of the nonwoven fiber aggregate may be fixed to the net body with an adhesive whose initial state is liquid like a two-component or solvent type. In addition, a configuration in which the net body is sewn with a thread is possible, and a configuration in which an adhesive and a suture are used together is also possible.

  In the above-mentioned pulp concentration net, as shown in claim 2, the guide portion forming body can take a configuration in which constituent fibers of the nonwoven fiber aggregate are bonded and bonded to each other with a fiber binding material. According to this, since the three-dimensional network structure is formed by the constituent fibers bonded and bonded to each other, and the shape retention characteristic and the compression recovery characteristic can be improved, the guide performance of the guide portion can be enhanced. Moreover, what is necessary is just to manufacture by impregnating a nonwoven fabric aggregate with a fiber bonding material, and manufacture is easy.

  In this case, for example, polyester fibers having excellent shape retention characteristics are suitable for the constituent fibers of the nonwoven fiber aggregate. On the other hand, as the fiber binding material, a synthetic polymer material that is familiar with the constituent fibers and excellent in adhesiveness may be used. Further, the mechanical properties such as the elasticity of the guide portion forming body can be changed depending on the material and the amount of adhesion of the fiber binding material, and therefore, it may be selected appropriately according to the performance required for the guide portion.

  As shown in claim 3, the pulp concentrating net can have a configuration in which a reinforcing portion in which the net body is reinforced with a synthetic polymer material is provided in an inner region from the guide portion. According to this, since the bending of the net body due to the external force acting in the vicinity of the guide body is suppressed by the reinforcing portion, it is possible to suppress the fiber cutting of the net body and further enhance the durability.

  In this case, the reinforcing part is simply formed by fixing a reinforcing sheet made of a synthetic polymer material to the net body so that the rigidity is higher than that of the base part of the net body. It can be configured to adhere to the net body via a heat-bondable adhesive sheet made of a synthetic polymer material, or it can be configured to adhere a reinforcing sheet made of a thermoplastic synthetic polymer material to the net body by its own thermal melting. is there. The configuration using the heat-weldable adhesive sheet is advantageous in avoiding wrinkles generated in the net body after heat-welding.

  In the present invention, as shown in claim 4, a guide portion is provided along an edge in the width direction of the net body in order to define a width direction position of the net body wound around the roll with respect to the roll. In the method for producing a pulp concentration net, the non-woven fiber aggregate is impregnated with a fiber binding material and the fibers of the non-woven fiber aggregate are adhesively bonded to each other with the fiber binding material. And the guide part formation body which consists of a nonwoven fabric aggregate obtained by this shall be fixed to the said net | network main body with an adhesive agent.

  According to this, since the guide part forming body is lightweight and has excellent flexibility and shock absorption, it is possible to reduce the load acting on the net body, thereby preventing the net body from being broken and durable. In addition, since the guide portion forming body is excellent in shape retention performance and compression recovery characteristics, it is possible to avoid a decrease in guide performance.

  In the manufacturing method of the said net for pulp concentration, as shown in Claim 5, the structure which forms the said nonwoven fiber aggregate | assembly by a needle punch can be taken. According to this, since the constituent fibers are strongly entangled by the needle punch, the shape retention characteristics are further improved.

  In addition, the guide part forming body according to the present invention may have a configuration in which constituent fibers intertwined with each other are fused.

  As described above, according to the present invention, since the guide portion is formed of a non-woven fiber aggregate that is lightweight and has excellent flexibility and shock absorption, the load acting on the net body is reduced and the net body is effectively broken. Since it can suppress, a big effect is acquired in improving durability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view schematically showing a pulp concentrator equipped with a pulp concentrating net according to the present invention. This pulp concentrator removes moisture from pulp in a process of separating and removing foreign matters such as ink and clay from waste paper raw materials, and concentrates the endless net 1 according to the present invention into a pair of rolls 2 and 3. It is wrapped around.

  In this pulp concentrator, the pulp is supplied from the supply unit 4 between the roll 2 and the net 1, and the pulp is pressed between the net 1 and the peripheral surfaces of the rolls 2 and 3, so that the moisture in the pulp is the outer surface of the net 1. The pulp discharged to the side and concentrated is collected by the collection unit 5.

  FIG. 2 is a cross-sectional view of the pulp concentration net shown in FIG. 1 cut in the width direction. The net 1 is provided with a guide portion 7 provided along an edge in the width direction of the net body 6 in order to define the width direction position with respect to the rolls 2 and 3, thereby suppressing the skew of the net 1. be able to. The guide portion 7 is provided in a state protruding from the surface facing the outer peripheral surface of the rolls 2 and 3 and is engaged with the end surfaces of the rolls 2 and 3.

  In addition, a reinforcing portion 8 in which the net body 6 is reinforced with a synthetic polymer material is provided in a region inside the guide portion 7 in order to suppress bending of the net body 6 in the vicinity of the guide portion 7.

  Here, the guide portion 7 is engaged with the end faces of the rolls 2 and 3, but a configuration in which the guide portion 7 is engaged with an annular groove provided on the outer periphery of the rolls 2 and 3 is also possible.

  FIG. 3 shows a first embodiment of the pulp concentration net shown in FIG. (A) shows a cross section in a state before assembly, and (B) shows a cross section in a completed state. Here, the guide part 7 is formed by fixing a guide part forming body 11 made of a non-woven fiber assembly to the surface 6a of the net body 6 on the side facing the rolls 2 and 3. Further, the reinforcing portion 8 has a higher rigidity than the ground portion of the net body 6 by fixing a reinforcing sheet 13 made of a synthetic polymer material to the surface 6b of the net body 6 opposite to the surface 6a on which the guide portion 7 protrudes. It is formed to become.

  The guide part forming body 11 is formed by adhesively bonding the constituent fibers of the nonwoven fiber assembly with a fiber binding material (binder). After the nonwoven fiber assembly is formed by needle punching, this nonwoven fabric assembly is formed. It is produced by impregnating a fiber assembly with a fiber binding material. Thereby, the guide part forming body 11 which is lightweight, excellent in flexibility and shock absorption, and excellent in shape retention characteristics and compression recovery characteristics can be obtained.

  As the constituent fibers of the nonwoven fiber aggregate, for example, polyester fibers excellent in shape retention characteristics, polyamide fibers, aramid fibers such as Kevlar (manufactured by DuPont), carbon fibers, and the like are suitable. On the other hand, as the fiber binding material, a synthetic polymer material (for example, a silicon resin) that is familiar with the constituent fibers and has excellent adhesiveness may be used.

  The guide portion forming body 11 is fixed to the net body 6 with an adhesive 12 whose initial state is liquid like a two-component or solvent type. The adhesive 12 is filled in the gaps of the guide portion forming body 11 and also filled in the woven fabric structure of the net body 6 to form the filling layer 17, whereby the guide portion forming body 11 and the net body 6 are firmly fixed. To be joined. The adhesive 12 is preferably a polyurethane-based one having excellent extensibility and durability.

  The reinforcing sheet 13 is fixed to the net body 6 via a heat-welding adhesive sheet 14 made of a thermoplastic synthetic polymer material. The reinforcing sheet 13 is fixed to the guide portion 7 so as to overlap in the thickness direction, whereby the peripheral portion of the guide portion 7 is integrally made highly rigid, and the net body 6 is bent in the immediate vicinity of the guide body 7. Can be suppressed. What is necessary is just to ensure the width | variety 10 mm-about 60 mm of the reinforcement part 8 by this reinforcement sheet 13. FIG.

  The reinforcing sheet 13 is made of polyurethane, and the adhesive sheet 14 is made of polyurethane having a softening point (for example, 140 ° C.) lower than the softening point (for example, 230 ° C.) of the reinforcing sheet 13. Thereby, it can suppress that the reinforcement sheet 13 itself heat-melts at the time of heat welding, and can suppress the wrinkle of the net | network main body 6 which arises after heat welding.

  The reinforcing sheet 13 may be ultrasonically welded with the adhesive sheet 14 sandwiched between the mesh body 6, whereby the synthetic polymer material of the adhesive sheet 14 is filled into the woven tissue of the mesh body 6, and the filling layer 18. The reinforcing sheet 8 and the net body 6 are firmly joined, and the reinforcing portion 8 is formed by the reinforcing sheet 13 and the synthetic polymer material of the adhesive sheet 14 filled in the fabric structure of the net body 6. It shows higher rigidity than the ground part of the net body 6.

  A configuration in which the reinforcing sheet 13 is fixed to the net body 6 with an adhesive is also possible. In this case, as the adhesive, for example, polyurethane dissolved in a solvent such as toluene or MEK may be used.

  FIG. 4 shows in detail the main part of the pulp concentration net shown in FIG. The net body 6 has a triple woven fabric structure, more specifically, a triple woven fabric structure composed of upper and lower two layers. The warp yarn 101 and the weft yarn 102 constituting the surface structure on the side to which the pulp is supplied are made of, for example, polyester monofilament. On the other hand, the warp yarn 103 constituting the back surface structure is made of, for example, polyester monofilament, and the weft 104 of the back surface structure is made of a monofilament of a polyamide-based synthetic resin material that is rich in flexibility. In addition, the textile structure of the net body in the present invention is not limited to this.

  FIG. 5 shows a second embodiment of the pulp concentration net shown in FIG. (A) shows a cross section in a state before assembly, and (B) shows a cross section in a completed state. Here, as in the above example, the guide portion forming body 11 made of a non-woven fiber assembly is fixed to the net body 6 to form the guide portion 7, and the reinforcing sheet 23 is fixed to the net body 6 to fix the net body. The reinforcing portion 8 having higher rigidity than the ground portion 6 is provided. However, unlike the above example, the material of the reinforcing sheet 23 made of a thermoplastic synthetic polymer material itself is a fabric of the net body 6 by heat melting. By filling the tissue, the reinforcing sheet 23 is fixed to the net body 6, and a synthetic polymer material filling layer 28 is formed in the net body 6.

  FIG. 6 shows a third embodiment of the pulp concentration net shown in FIG. Here, as in the above example, the guide part forming body 11 made of a non-woven fiber assembly is fixed to the net body 6 to form the guide part 7, but unlike the above example, the guide part forming body 11 is fixed to the net body 6 by an adhesive 12 and is sewn to the net body 6 by a suture 31. Thereby, the guide part forming body 11 can be firmly fixed to the net body 6, and further, the collapse of the structure of the guide part forming body 11 can be suppressed.

  FIG. 7 shows a fourth embodiment of the pulp concentration net shown in FIG. (A) shows a cross section in a state before assembly, and (B) shows a cross section in a completed state. Here, as in the example shown in FIG. 5, the reinforcing sheet 41 is fixed to the net body 6 by filling the woven tissue of the net body 6 with the synthetic polymer material itself by heat melting. Unlike the example, the reinforcing sheet 41 is made of a sheet-like composite material having reinforcing yarns in a synthetic polymer material.

  FIG. 8 is an enlarged view of the reinforcing sheet shown in FIG. The reinforcing sheet 41 is formed by laminating a composite material layer 56 in which a base fabric 55 made of reinforcing yarns 51 to 54 is impregnated with a synthetic polymer material (matrix resin) and a film layer 57 made of a synthetic polymer material (polyurethane). The structure is made. The fabric 55 of the composite material layer 56 has lengthwise yarns (warp yarns) 51 and 53 and widthwise yarns (weft yarns) 52 and 54, and is made of a multi-woven fabric such as a double weave or a plain weave. A plurality of woven fabrics are laminated. Reinforcing yarns 51 to 54 are preferably polyurethane or polyester. In addition, polyamides such as nylon, PEEK, and aramid fibers such as Kevlar (manufactured by DuPont) may be used as long as they can suppress elongation and improve strength. Is possible.

  In this configuration, the synthetic polymer material of the film layer 57 of the reinforcing sheet 41 is thermally melted and filled into the fabric structure of the net body 6 to form the filling layer 42. The main body 6 overlaps in the thickness direction. Thereby, the rigidity of the portion of the reinforcing portion 8 in the vicinity of the guide portion 7 is further increased, and the guide performance can be improved and the durability can be increased.

  In the above example, the synthetic polymer material used for the reinforcing sheet and the adhesive sheet is polyurethane, but the present invention is not limited to this. For example, polyvinyl chloride, polyamide (nylon), polyester, etc. Is also possible. In particular, polyurethane is excellent in terms of mechanical strength and wear resistance, and also has good adhesion to the textile fibers (polyester) of the net body.

  Further, a mode in which a reinforcing sheet made of a sheet-like composite material having reinforcing yarns in a synthetic polymer material is fixed to the net body through a heat-weldable adhesive sheet as in the example shown in FIG. 3 is also possible.

  The pulp concentrating net according to the present invention has an effect of effectively suppressing breakage of the net body and enhancing durability, and is used by being attached to a pulp concentrator that compresses and concentrates (dehydrates) pulp. Useful for. Further, the method for producing a pulp concentration net according to the present invention is useful for use in producing the pulp concentration net having the above-described configuration.

It is sectional drawing which shows typically the pulp concentration machine with which the net | network for pulp concentration by this invention is mounted | worn. It is sectional drawing which cut | disconnected the net for pulp concentration shown in FIG. 1 in the width direction. It is a conceptual diagram which shows 1st Embodiment of the net for pulp concentration shown in FIG. It is sectional drawing which shows the principal part of the mesh for pulp concentration shown in FIG. 3 in detail. It is a conceptual diagram which shows 2nd Embodiment of the pulp concentration net | network shown in FIG. It is a conceptual diagram which shows 3rd Embodiment of the pulp concentration net | network shown in FIG. It is a conceptual diagram which shows 4th Embodiment of the net for pulp concentration shown in FIG. It is sectional drawing which expands and shows the reinforcement sheet | seat shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Net | network 2/3 Roll 6 Net | network main body 7 Guide part 8 Reinforcement part 11 Guide part formation body 12 Adhesive 13 Reinforcement sheet 14 Adhesive sheet 23/41 Reinforcement sheet 31 Binding yarn

Claims (5)

In order to define the width direction position of the net body wound around the roll with respect to the roll, a pulp concentrating net provided with a guide portion along an edge in the width direction of the net body,
A pulp concentrating net, wherein the guide part is formed by adhering a guide part forming body made of a non-woven fiber aggregate to the net body.   The pulp concentration net according to claim 1, wherein the guide portion forming body is formed by adhesively bonding the constituent fibers of the nonwoven fiber assembly with a fiber binding material.   The pulp concentrating net according to claim 1 or 2, wherein a reinforcing part in which the net body is reinforced with a synthetic polymer material is provided in a region inside the guide part. In order to define the width direction position of the net body wound around the roll with respect to the roll, a method for producing a pulp concentrating net provided with a guide portion along an edge in the width direction of the net body,
In forming the guide portion, the nonwoven fiber assembly is impregnated with a fiber binding material, and the constituent fibers of the nonwoven fiber assembly are adhesively bonded to each other with the fiber binding material. A method for producing a pulp-concentrating net, characterized in that a guide part forming body made of an aggregate is fixed to the net body with an adhesive.   The method for producing a pulp concentration net according to claim 4, wherein the nonwoven fiber aggregate is formed by needle punching.

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