JPS6138958Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention consists of multiple layers, has a large void volume,
It relates to papermaking felt with a smooth surface and excellent compressive elasticity, and more specifically, a large number of spiral threads made of filaments of synthetic resin are interlocked one after another, arranged in parallel in the width direction, and connected by a core wire. An endless woven fabric woven with a filament of synthetic resin, spun yarn of synthetic fibers and/or natural fibers, and a butt of synthetic fibers and/or natural fibers arranged on one or both sides of both layers. The present invention relates to an endless needle felt for paper making which is formed by stacking layers and integrating them by needling. Conventionally, papermaking felt using a mesh fabric in which a large number of spiral threads are connected by a core wire is usually made by stacking fiber butts on an end-shaped mesh fabric and joining them together by needling, and when in use, the spiral threads at both ends are Like the other parts, they were connected by core wires, but there were also some in which the fiber butts were connected to a net-like cloth in which spiral threads were connected endlessly. This material has good water permeability and dimensional stability, and is easy to load into the paper machine.
It has advantages such as being easy to manufacture, but because the spiral threads are arranged in an upright manner, even though it is covered with fiber batts, the wet paper has a net-like cloth mark. In order to prevent this, the amount of batts must be extremely large, but this has the drawbacks of increased weight, reduced water permeability, easy attachment of dirt substances, and low strength.
The present invention is an endless needle felt for paper making that improves on these drawbacks and does not leave marks on paper, is water-resistant, has high strength, and has superior dimensional stability. . The endless needle felt for paper manufacturing of the present invention is composed of a reticulated cloth 1, a woven cloth 2, and a fiber batt 3, which are joined together by needling to form an integral body. The net-like cloth 1 is made by meshing a large number of spiral yarns 4 made of monofilament or multifilament synthetic resin in parallel in the width direction, inserting core wires 6 into the common holes 5 created by this, and connecting them one after another. The monofilament is made into a spiral yarn as it is, while the multifilament is made into a twisted yarn and treated with a resin if necessary.
The spiral yarn may be made of polyamide, polyester, polyacrylonitrile, polypropylene, or the like, and has a fineness of 600 to 3,500 deniers, preferably 1,000 to 25,000 deniers.
Resins for resin treatment include epoxy, phenol,
Resins such as melamine, formaldehyde, polyamide, and polyurethane are used. As the core wire, a synthetic resin monofilament single yarn, a monofilament and multifilament twisted yarn or a core yarn, or a multifilament twisted yarn treated with a resin is used, and a denier of 1500 to 5000 is preferable. The synthetic resin for the core wire is preferably polyamide, polyester, etc., and the resin for resin treatment is preferably epoxy, phenol, polyamide, polyurethane, or the like. The woven fabric 2 is made of monofilament or multifilament of synthetic resin and spun yarn of synthetic fiber and/or natural fiber, each alone or in combination of these yarns.
A textile woven into an endless or an end weave. An endless weave is used as is, and an end weave is used by splicing both ends together using a conventional method to make it endless. In this case, it is important that the joint part has the same texture as the other parts and is flat so that there are no irregularities. The woven fabric 2 is used to cover the marks of the reticulated fabric 1 so that they do not stick to the wet paper, to receive the water squeezed out from the wet paper as a whole, and to increase the pore volume through which the water flows, and to increase the strength of the felt. The purpose is to raise the yarn, and it is made of yarn that is somewhat flexible but hard enough to hold the gap without crushing even when pressurized with a press roll, and is made so that the gap is as wide as possible without causing marks. . It is preferable to use yarns with high strength and good flexibility for the papermaking machine direction yarns (hereinafter referred to as warp yarns 7), and yarns with excellent elasticity and abrasion resistance for the transverse machine direction yarns (hereinafter referred to as weft yarns 8). The structure may be single or multiple weave, but it is preferable to use endless weave for single and multiple weaves that are difficult to weave, and it is preferable to use end weave for multiple weave that is difficult to weave. . The yarn is a monofilament or multifilament of synthetic resin, or a spun yarn of synthetic fiber and/or natural fiber, and these can be used alone or in combination. The thickness of these threads is generally thinner than the spiral thread. The material of the synthetic resin is the same as that of the spiral thread, and the synthetic fiber is polyamide-based, polyester-based, polyacrylonitrile-based, polypropylene-based, etc.
Natural fibers include wool, cotton, and linen. The bat 3
Normally, 1 to 10 layers are laminated on the woven fabric side, i.e., the front surface, of the net fabric 1 and the woven fabric 2, but depending on the purpose, 1 to 5 layers are laminated on the net fabric side, i.e., the back side, and the above-mentioned layer is laminated by needling. Bonded to reticulated and woven fabrics. The fibers that make up the batt are synthetic fibers or natural fibers, either alone or a mixture of both.Synthetic resins include polyamide, polyester, polyacrylonitrile, and polypropylene, and natural fibers include wool and cotton. , hemp, etc. The endless needle felt for paper manufacturing of the present invention is manufactured as follows. Heat-set monofilament spiral yarns are interlocked one after another while being arranged in parallel in the width direction, and a core wire is inserted into each of the created common holes to create a net-like cloth with ends. At this time, right-turning ones and left-turning ones are arranged in parallel alternately. The width of the felt is adjusted by the length of the spiral threads, and the length of the felt is adjusted by the number of spiral threads. Next, the spiral threads at both ends of the ended mesh fabric are interlocked, and the core wire is inserted into the common hole created to form an endless mesh fabric, which is then placed under tension in a dryer with a heating cylinder and stretch rolls facing each other. Hang it over the cloth, heat it, and heat set it to make the spiral into an oval shape. Separately, an endless woven fabric is woven by taking into consideration the weaving structure, thread usage, thread density, length, width ratio, etc. Next, the reticulated fabric and the woven fabric are placed in a needle machine as shown in FIG. It is rotated at a low speed by a driven roll 11, guided and run by a guide roll 12, and while a butt 3 continuously supplied by a lattice is placed thereon, needling is performed by a needle board 14 and the batt is made to go around once. After performing this operation a desired number of times, the butt supply is cut off. Although this may be done as it is, it is preferable to carry out needling as many times as necessary even after the stacking of the butts 3 is stopped in order to strengthen the entanglement between the fibers. To provide the butts 3 on the net-like cloth side, that is, on the back side of the felt, it is sufficient to turn over the felt and perform the same operation. Furthermore, finishing treatments such as chemical treatment, burning, and heat setting are performed as necessary. As mentioned above, the endless needle felt for paper making of the present invention is made up of a large number of connected spiral threads made of monofilament of synthetic resin, and although the material of the threads is relatively hard and flexible, the material is elastic as a whole. It has a structure in which a reticulated cloth with large pores and a flat surface, a woven fabric with a flat surface and good flexibility and large pores, and a flexible, compressible, porous butt overlap and are firmly bonded by needling. It has excellent paper-making properties such as water resistance, dimensional stability, and abrasion resistance, and has excellent flexibility, making it easy to load and remove from the paper machine, and has good runnability. There is an effect. Hereinafter, examples will be given and the remarkable effects of the present invention will be explained. Example 1 The following endless needle felt for paper making was obtained by the above-described technique. The structure and effects will be described in comparison with comparative examples. (1) Structure A large number of spiral threads of 0.6mmφ nylon monofilament are arranged in parallel and connected by a 0.6mmφ nylon monofilament core wire to form an endless shape.The net fabric is heat set and the warp is 240 denier nylon monofilament. 3 strands of 40/5
cm, and the weft is 36 threads/5 cm of two strands of nylon monofilament with a weft of 420 denier.The fabric is woven endlessly in plain weave, and 6 layers of nylon staple butts are layered and firmly bonded by needling. Needle felt with a weight of 1700g/m ² and a thickness of 4.46mm. [Structure of Comparative Example] The reticulated cloth was the same as in Example 1,
Increase the amount of butt and increase the basis weight with only these two layers.
Needle felt 1700g/m ² (thickness 4.22mm). (2) Effects A comparison between the needle felt of this example and the needle felt of a comparative example is as follows.

【table】

[Table] Compared to the comparative example, the needle felt of this example has
It has a large pore volume, so it has good air permeability, is elastic, and has excellent water resistance.The smooth surface does not leave marks on the paper, and the paper has many benefits, such as having a low moisture content after water is squeezed out. It should be noted that among the measurement items in the table above, - are measured using a papermaking tester, and - are measured using a table test. The test conditions of the papermaking tester and the definitions of each measurement item are as follows. (a) Test conditions for paper tester Roll and linear pressure: Steel groove roll 120Kg/cm Needle felt running speed: 400m/min (b) Definition of measurement items The calculation formula and measurement conditions for each measurement item are as follows. . Moisture content Weight of paper with water - Weight of bone dry paper / Weight of bone dry paper x 100 Compression rate Thickness when applying initial load (0.1Kg/cm ² ) - Thickness when applying pressure / Initial load Thickness when applying x 100 Recovery rate Thickness when pressure is removed (with 0.1 kg/ ^cm2 pressure) / Thickness when pressurized x 100 Compressive modulus Thickness when pressure is removed - Thickness when pressurized / Initial Thickness when applying load - Thickness when applying pressure x 100 Thickness retention rate Thickness when removing pressure / Thickness when applying initial load x
100 Water velocity 30℃±1℃ water 3, head difference 500
mm, then turn the flow upward,
This is the time required to pass a sufficiently wet felt sandwiched between two 120mmφ stainless steel plates, and when water is directed vertically, the pressure applied to the water is 1kg/
cm ² , stainless steel plate has both top and bottom aperture ratio
A 10% stainless steel plate was used, and the pressure applied to the water was 3 Kg/cm ² when water was directed horizontally.The stainless steel plate had no holes on the top and a 10% open area on the bottom. Example 2 The following endless needle felt for paper making was obtained using the technique described above. An endless net-like cloth made by connecting a large number of 0.4 mmφ polyester monofilament spiral yarns with a 1.0 mmφ core wire made by twisting and twisting polyester monofilament and nylon multifilament, and two polyester monofilament yarns with a warp of 420 denier. 44 strands/5cm, 34 strands/5 of polyester multifilament weft
A woven fabric made of a mixture of nylon stable and wool, which is made into an endless woven fabric after weaving it in an edged form with double wefts of the weft, and a woven fabric made of a mixture of nylon stable and wool, 4 layers on the woven fabric side and 1 layer on the net fabric side. Fabric weight combined by layering and needling
1400g/m ² , 4.38mm thick needle felt. When this material was subjected to a papermaking performance test using the papermaking tester mentioned above, no marks appeared on the paper, and the moisture content of the paper after water extraction was 56%. This was considerably better than the water content of paper, which was 58% when marks were placed on the paper.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional view along the length direction of the endless needle felt for paper making of the present invention, Fig. 2 is a partial plan view of the mesh fabric, Fig. 3 is a partial plan view of the woven fabric, and Fig. 4
The figure shows a manufacturing needle machine. In the figure, 1 is a mesh fabric, 2 is a woven fabric, 3 is a butt, 4 is a spiral yarn, 6 is a core wire, 7 is a warp, 8 is a weft, 9 is a stretch roll, 10 is a drive roll, and 14 is a needle board. be.

Claims (1)

[Scope of utility model registration request] A net-like cloth made of endless spiral threads made of filaments of synthetic resin, interlocked one after another, arranged in parallel in the width direction, and connected by a core wire, and a filament of synthetic resin, synthetic fibers, and/or natural fibers. An endless woven fabric woven from one or more types of spun yarns and a butt of synthetic fibers and/or natural fibers arranged on one or both sides of both layers are layered and bonded and integrated by needling. An endless needle felt for paper making.