KR20010017780A - A process for the production of cold plate roller and their roller using wasted fabric material - Google Patents

Abstract

PURPOSE: A production method for a roller is provided to save production costs by using waste fiber classified as a waste material and to produce the roller satisfying impact resistance, earthquake resistance, heat resistance, chemical resistance and so on. CONSTITUTION: Waste fiber is formed in a planar and nonwoven type of specific thickness by scutching the waste fiber. To have a desired shape of diameter for the planar and nonwoven type waste fiber, a disc is made up by using a die. The disc is soaked in a vacuum impregnation tub for a permeation treatment. Herein, the vacuum impregnation bath is mixed up with a thermosetting resin, a rubber and a vulcanizing agent. The disc is dried in a drier and deposited on a frame for a roller. In a state of depositing the disc, the disc is compressed horizontally. The disc is heated and hardened while keeping a compressed state. Then, the disc is finished in a desired shape by grinding the surface of the hardened disc.

Description

A process for the production of cold plate roller and their roller using wasted fabric material}

The present invention relates to a method for producing a feed roller for a cold rolled steel sheet in a steel mill and a roller manufactured by the method. In particular, after constructing the basic skeleton from waste fiber as a raw material, vacuum impregnating rubber and thermosetting resin in the voids of the waste fiber and drying them, then laminating them in a certain form and thermosetting them so that the elasticity of the rubber and the durability of the thermosetting resin are synergistic. The present invention relates to a new steel mill roller that has improved heat resistance, chemical resistance, and impact resistance.

In the steel industry, in order to wind up the rolled steel sheet in a certain form, it is necessary to transfer the steel sheet of several hundred meters to several kilometers. During this transfer, the steel sheet is partially waved or vibrated due to partial tension change and winding speed mismatch Vibration absorption control rollers and elastic rollers are used together as a means for generating and absorbing them.

In the case of steel rollers, steel sheets are usually made of steel, even if only a slight conveyance error occurs during the transfer of steel strips to the surface, which can cause defects. That is, when the drawing distance reaches several kilometers, the drawing force of several tens of tons or hundreds of tons is acting. If a speed difference occurs in the left and right parts, a strong wave is generated, which causes damage to the contact surface and causes a defect. In this case, sensors are installed at various locations in the field to automatically adjust the drawing speed or drawing strength. However, it is difficult to automate minute changes that occur instantaneously throughout the entire process, and even if they are automated, they are a factor of cost increase due to the huge installation cost, so that the operator is placed on the side of the line to detect the occurrence of vibration in advance Checking is the main means.

In addition, the partial left and right unbalance caused by loading and transporting raw materials in various industrial sites also causes the same problem.

In addition, even if the shank is visually observed, instantaneous surface damage of the rolled plate that is wound or transported at high speed cannot be avoided, and even if the worker finds such a phenomenon immediately after stopping the whole process, after adjusting the overall tension and adjusting the direction As the process proceeds, interruption of the process and product damage are inevitable.

In order to improve the disadvantage, rubber and rubber rollers are placed to absorb vibration and distortion by using the elasticity of rubber. However, due to friction with steel sheet, it has to be replaced within a few months for a few days to hundreds of kg. Replacing these rollers requires significant equipment and manpower and at the same time stops the process.

The nonwoven rubber laminated roller of the present invention is disclosed in Utility Model Registration Application No. 29373 in 1997. In this case, a nonwoven fabric made of yarn, not waste fiber, was molded into a donut shape and placed in a roller frame in order with elastic rubber, followed by compression and heat treatment, thereby producing a desired roller. Therefore, once the cost of the nonwoven fabric is high, the part where the nonwoven fabric and the rubber layer directly contact is well adhered as it is, but the middle part of the nonwoven fabric has a hollow part that is not bonded, and thus the elasticity and strength are different from other places. Therefore, degeneration occurs around unfilled parts during use, which is a major factor in post-occurrence problems.

The present invention was developed to provide a roller that satisfies the impact resistance, shock resistance, chemical resistance, heat resistance, etc. required by the steelmaking roller while using the waste fibers classified as waste as raw materials. In particular, by using waste fibers as a raw material and using a combination of rubber and thermosetting resin together to solve the above problems by showing the elasticity of the rubber and the fire resistance and heat resistance of the thermosetting resin. In addition, in the production of rollers, waste fibers are formed into non-woven fabrics to form numerous voids, and the vacuum impregnation method is used together to facilitate the penetration of resins and rubbers into the voids so that uniformly curable and elastic substances can penetrate. By removing the nonuniformity of the surface and inside.

1 is a manufacturing process diagram of the present invention,

2 is a perspective view of the disc disk of the present invention;

3 is a block diagram of a state where the disc disk of the present invention is loaded in an impregnation tank;

Figure 4 is a side view of the disk disk of the present invention dried and laminated;

Figure 5 is a side view of the disk disk of the present invention before and after surface curing after compression curing.

<Explanation of symbols for main parts of drawing>

DESCRIPTION OF SYMBOLS 1 Roller frame 3 Center hole 10 Disc disk 15 Fiber layer

30: mixed filling liquid 50: impregnation tank 60: compression plate 70: irregular surface

The present invention is a process to form a nonwoven form with a lot of voids by processing the other surface of the waste fiber and to form a plate-like shape having a predetermined thickness and space, using a mold to have a desired shape diameter to the plate-shaped nonwoven waste fiber. Process of making disc disc, process of immersing the made disc in vacuum impregnation tank containing additives such as thermosetting resin, rubber and vulcanizing agent, drying process of resin and rubber infiltration in dryer, drying process The process of laminating the disc to the roller frame, the process of compressing in the lateral direction in the stacked state, the process of heat curing while maintaining the compressed state, and the surface of the hardened thing to be finished by grinding or surface treatment to the desired shape. It consists of a process.

The waste fibers used in the present invention include all natural fibers, synthetic fibers, or mixed fibers thereof, and may be employed unless there is a problem in bonding or stability, especially in relation to rubber and thermosetting resin, but the components are as constant as possible. When used together, it can be appropriately used according to the characteristics of the resin and rubber used, and the strength and durability can be predicted after molding.

The rubber that can be used in the present invention, in addition to simple natural rubber, SBR (styrene butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber), EPDM, IR (isoprene rubber), BR (butadiene rubber), CSM (chlorosulfonated Polyethylene), urethane rubber, EVA and the like can all be employed.

Thermosetting resins usable in the present invention may be selected from phenol resins, unsaturated polyesters, furan resins, urea resins, melamine resins, diaryl phthalate resins, epoxy resins, fluorine resins, polyimide resins, and the like. The ratio of resin to rubber is 0.1 ~ 1.5: 1 based on the required use of the resin and rubber. The ratio of resin to rubber is appropriate (by weight). The higher the strength of the resin, the lower the rubber compounding ratio and the less elasticity. Is characterized by being enhanced.

Hereinafter, the manufacturing process of the present invention will be described through specific embodiments based on the accompanying drawings.

The roller of the present invention forms a filling layer by infiltrating rubber and thermosetting resin into a nonwoven fiber layer forming a donut form of a thin plate, and stacking them so that a central hole is inserted into a roller frame, and then curing them while compressing. What is hardened can be used as a roller for the desired steelworks by polishing and finishing the surface.

The present invention is a step of forming a nonwoven fabric of the disassembled woven state by treating the waste fibers discarded in the fibers made of synthetic fibers or natural fibers or mixed fibers thereof as shown in Figure 1,

Disc disc manufacturing process that cuts non-woven waste fiber into disc disc using circular press mold,

Stacking the cut discs in a predetermined amount and placing them in a closed impregnation tank 50 filled with a mixed filling liquid 30 composed of a thermosetting resin and rubber to maintain a vacuum to infiltrate the resin and rubber into the pores of the fiber;

When resin and rubber are sufficiently penetrated, it is put into a drying furnace and dried.

Laminating in order to the roller frame (1) by using the central hole (3) of the original disk is dried and then compressed into a compression plate 60 in the transverse direction,

Process to heat-cure into a high-temperature curing tank while maintaining the state of high-pressure compression,

It is composed of a surface finishing process for polishing the irregular surface 70 by using a shelf or other device to the surface of the heat curing is completed.

In the present invention, the degree of processing the other surface of the waste fiber is to be 180 ~ 250Kg per unit volume (㎥). If the treatment is less than 180 it is difficult to maintain the skeleton structure of the fiber due to too many voids, more than 250 it is difficult to control to have the desired properties because the addition amount of the resin and rubber is less.

In the present invention, the impregnation tank 50 to maintain the vacuum may vary depending on the shape of the fiber, but the impregnation treatment for 0.5 to 3 hours at room temperature while maintaining at least 0.1 atm or less.

In the present invention, the thermosetting resin and rubber used in the impregnation treatment are mixed in a ratio of 0.1 to 1.5: 1.0 by weight, and a small amount of vulcanizing agent, curing accelerator, and mixing accelerator is added according to the characteristics of the resin used. When the rubber used is a synthetic rubber, a curing accelerator for thermosetting resin and a rubber curing accelerator may be used at the same time, and any rubber suitable for curing may be used.

Complete the impregnation treatment in the present invention is put into a drying furnace to be dried by hot air circulation at a temperature of less than 100 ℃. If the drying temperature is too high, it hardens as it is, and the hot air is circulated to avoid partial temperature unevenness. Drying is suitable as long as the liquid resins and rubbers do not adhere to the surface.

After the drying is completed, the roller frame 1 is inserted into the central hole 3 to be laminated, and then compressed using a press machine to the left and right compression plates 60 in the axial direction of the roller frame. Compression pressure is to be 50 ~ 50,000 kg / ㎠. Depending on the type of rubber and resin used and the waste fiber used, the pressure should be lowered according to the amount of rubber used and should be selected according to the diameter or elasticity of the waste fiber. When compressed to 50 or less, the internal voids become too wide and elastic, but they are easily worn and deformed. Compressing more than 50,000 increases strength and durability, but the elasticity is too low, which tends to damage the plate steel plate to be transported. It will be damaged by the shock.

Completion of the compression is put into a high-temperature curing tank 70 while maintaining the compression state as it is to be cured. The curing treatment is performed at an internal temperature of 100 to 180 ° C. and a pressure of 4 to 5 kg / cm 2 for 7 to 12 hours. The internal temperature can be changed to suit the curing of the resin and rubber used.

The Example manufactured according to the above process is demonstrated.

Example 1

The waste fiber mixed with cotton and polyester 9: 1 was cut into a donut shape having a thickness of about 3 mm using a press mold. The nonwoven fabric was laminated by a certain number and placed in an impregnation tank maintained at least 0.1 atm or less in a solution in which the phenol resin and the NR rubber were mixed in a ratio of 1: 1 to allow the mixed solution to penetrate for 2 hours. The donut-shaped disk disk which has been impregnated was taken out and placed in a drying furnace capable of circulating hot air maintained at 60 to 70 ° C. and dried for about 1 hour. When the drying is completed, the center hole is inserted into the rod-shaped roller frame to be laminated along the direction of the roller frame to finish both ends with a steel sheet. Subsequently, the steel plates at both ends were subjected to axial compression by applying a pressure of about 20 tons using a high pressure press. The mixture was placed in a high temperature curing tank while maintaining a compressed state, and cured for about 10 hours while applying a temperature of 130 ° C. and a pressure of about 4 Kg / cm 2. When the hardening is completed, if the surface is trimmed uniformly using a well-known processing machine, the target roller will be obtained. Physical properties of the resulting product are shown in Table 2.

Hereinafter, the examples according to various materials and conditions will be described in Table 1 below.

* Chemical resistance in the above embodiment is based on the presence or absence of changes caused by immersing the roller in an alkaline chemical agent of at least pH 4 and less than pH 10 and then heating to 100 ℃ or more. Abnormality is judged to be excellent if there is no crack on the surface and no pinhole occurrence of 0.1 mm or more.

* Heat resistance is judged as the degree of carbonization of the roller surface when left at the temperature of 130 ~ 150 ℃ for more than 6 months. When carbonization occurs on the surface and keratin separation phenomenon of 1cm2 or more occurs, it is judged to be defective.

* Machinability is judged to be defective when the manufactured roller is processed into grinder, friction paper, and bite when particle separation of more than 1cm 2 or hole of more than 1mm in depth occurs.

As shown in the above examples, the rollers produced by the manufacturing process of the present invention were found to be excellent in chemical resistance, heat resistance and processability.

.

Claims (4)

A process of forming waste fibers discarded from synthetic fibers or natural fibers or mixed fibers thereof to form 180 to 250 g per m3 to form a nonwoven fabric in a disassembled woven state, Disc disk manufacturing process that cuts non-woven waste fiber into a circle with a central hole by using a circular press mold, The cut discs were laminated in a predetermined amount, and the thermosetting resin and rubber were placed in a closed impregnation tank 50 having a ratio of 0.1 to 1.5: 1 based on the weight ratio, and maintained at a vacuum of 0.1 to 0.5 to 3 The process of penetrating resin and rubber into the inner voids of the fiber for a time, When the resin and rubber sufficiently infiltrate the process, it is put in a drying furnace and dried at a temperature of 60 to 80 ℃, Laminating in order to the roller frame (1) by using the central hole (3) of the original disk is dried and then compressed to the center with a compression plate 60 at a pressure of 0.5 to 50 tons / ㎠ in the transverse direction, Process of thermosetting at a temperature of 110 to 130 ° C. in a high temperature curing tank while maintaining a state of high pressure compression; A method of manufacturing a roller for an internal-rolled steel sheet steel, comprising a surface finishing process for polishing an irregular surface 70 by using a lathe or other device on the surface of the thermal curing. The method of claim 1, The thermosetting resin used is any one or a mixture of phenol resins, unsaturated polyesters, furan resins, urea resins, melamine resins, diaryl phthalate resins, epoxy resins, fluorine resins, and polyimide resins. Manufacturing method of roller for steel mill. The method of claim 1, Rubber which can be used is SBR (styrene butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber), EPDM, IR (isoprene rubber), BR (butadiene rubber), CSM (chlorosulfonated polyethylene) A method for producing a roller for cold rolled steel sheet, characterized in that any one of urethane rubber and EVA or a mixture thereof. Waste fiber discarded from synthetic fiber or natural fiber or fiber made of mixed fiber is processed to be 180 ~ 250Kg per m3, molded into plate-shaped nonwoven fabric, cut into disc shape with central hole (3) Lay the disc disk cut in a certain amount, and put the thermosetting resin and rubber in the closed impregnation tank 50, which is mixed in a ratio of 0.1 to 1.5: 1 based on the weight ratio, and keeps the vacuum below 0.1 atm. Preparing a disk disc obtained by infiltrating the resin and rubber into the interior voids of the fiber for 3 to 3 hours and drying the mixture at a temperature of 60 to 80 ° C. Lay in the roller frame 1 by using the central hole (3) of the disk disk is dried, and then axial compression on both sides with the compression plate 60 at a pressure of 0.5 to 50 tons / ㎠ in the transverse direction The roller for cold rolled steelworks obtained by grinding the surface of the roller obtained by making it into the high temperature hardening tank, maintaining the high pressure compression, and thermosetting at the temperature of 110-130 degreeC.