SU575015A3 - Device for continuous casting of sheet material - Google Patents

Description

(54) DEVICE FOR CONTINUOUS CASTING SHEET MATERIAL

The view along EE in FIG. 12; in fig. 17 is a section along LCF Hi FIG. sixteen.

The device contains two infinite conveyor belts 1 and 2 arranged one above the other, envelopes pulleys 3,4 and 5, 6, two groups of supporting rollers 7, 8 providing adjustment of the distance between the belts 1 and 2, the heated water spraying system 9 and 10, infrared I and 12 heaters.

In the wedge-shaped gap formed by the horizontal surface of the lower conveyor belt 2 and the curved surface of the upper belt 1, a feeder 13 is installed with an exit slit 14 on the upper face to which the polymerized liquid material is fed with a pump 15.

The feeder 13 is connected to the stationary (not indicated in the drawing) by means of the bar 16 and the axis of the pawl 3 with the help of the shaft 17 and the supporting device 18.

The molding cavity is formed by ribbons 1 and 2, and is flanked on the sides by tape seals 19 and 19a, which are tubes of soft polyvinyl chloride. To seal both sides of the first surface of the feeder 13, solid gaskets 20 made of Teflon are used.

FIG. 10 a and 10 b are shown seals in the form of hollow figured tubes, usually used in the manufacture of thick sheets of material.

For making a thinner sheet, the seals shown in FIG. 10 v, 10 g, 10 d. FIG. 10 in the seal are a large diameter tube and a tube or rod of a smaller diameter; in fig. 10 g - tube and tape, in FIG. 10 v - tubes of different diameters that can move relative to each other.

Supporting tools. for belts 1 and 2, there are supporting rollers 7, 8, which are drums mounted on shafts 21 by means of sub-supports 22. Cords of shafts 21 are mounted in brackets 23. Between the upper and lower belts 1 and 2 there are seals 19.

FIG. 12 shows another embodiment of the device where the lower belt 2 is supported by frame supports 24. The distance between the belts is adjusted by frames supporting the upper belt 1 and consisting of shthangs 25 and 26. Two adjacent rods are moved by support mechanisms 27. The rods 25 and 26 made with guide members 28 to reduce frictional forces between the shanks and the surface of the belts.

The guides are made of Teflon. The parts of shtang in contact with tapes 1 and 2 should have a slight bend (maximum bend less than 0.05 mm). Rods are made of metal. With the right choice of material, size, and distance between the centers of rotation of the shafts 29 on which the rods 25 are mounted, the shafts can bend while maintaining the flat surface of the belts 1 and 2.

FIG. 15 shows a heat exchange system in which hot water is used as the heating medium. The top of the belt 1 is heated with hot water sprinkled by drivers 30. 5 To heat the bottom belt 2, water is supplied through valve 31 to the bottom support 32. Tanks 33 are used to collect the used WATER.

FIG. 16, 17 shows the lower support 32. A group S1-ang 34 is provided in the rectangular frame 35. The rods are designed to hold the lower belt 2 in a horizontal position. The guide member 36 is similar to the element 28.

The device works as follows.

15Polymerizable liquid material is pumped by pump 15 and supplied between belts 1 and 2 by feeder 13. The polymerizable material is heated and polymerized under the action of a spraying hot water system 9 and 10 during the ribbon movement and thereafter the polymerized material is heated by infrared KS11 heater, 12 with completion of polymerization. Then the finished polymer sheet is retracted.

The thickness of the polymer sheet is determined by

25 mainly during the passage of the heating area by the spray system of the heated water. The distance between the surfaces of the belts is determined with the fact that in the initial half of the polymerization zone, the viscosity of the polymer compound is still

30 lila and it has fluidity. The distance between the ribbons in this zone is maintained larger than the thickness of the layer of liquid material needed to obtain the finished sheet.

In the final half of the polymerization zone, where 35 the viscosity of the polymer compound becomes already high as the polymerization develops, the distance between the surfaces of the tapes corresponds to the thickness of the finished sheet.

Liquid source material includes

40 A mixture of one or more mono-ethylenically unsaturated compounds and / or polyfunctional polymerizable compounds. These monomers can be applied as a mixture of a polymer in solution or suspension and or a partially polymerized mixture.

45 monomer-polymer.

For example, methacrylate, styrene or its halogenated alkyl derivatives, vinyl acetate, etc., or mixtures of a sufficient amount of these compounds and acrylates, acrylonitrile, or their derivatives were used as monoethylenated compounds. For example, glycol dimethacrylates, diallyl methacrylates, diallyl phthalates and diethylene 55 glycol bis-sulfonate carbonate are used as the polybase polymerizable compounds.

The flowable material is mixed with polymerization catalysts. The source fluid may be mixed with various additives, such as stabilizers, plasticizers,

60 polymerization reagents. filibib, kraoithiasis, shreds, additives to improve mold recovery, and the like. The following is one of the examples in which the device shown in FIG. 1. Two continuous belt conveyors with a thickness of 1 mm, a width of 800 mm, and a length of 15.5 and 16.5 meters respectively, made of smooth and flat stainless steel, are installed by means of upper and lower leading shkivs with the same diameter of 1000 mm, with a force of 6.4 tons. The polymerization section has a total length of 6 m, the front of which is 4 m long and heated by spraying hot water of 80 ° C on the outer surface of the conveyor belt with a spray gun With an interval of 200 mm and in each pair there is one upper and one lower rollers, and therefore, the positions of the belts of the continuous conveyor and the distance between the surfaces of the belts are adjustable. The remaining part of the 2 m polymerization zone is heated to a temperature above 120 ° C on both external surfaces of the endless belts of conveyors by infrared heaters, whereby the material is heat treated. Two continuous conveyor belts (top and bottom) are driven at a speed of 10 cm / min. Provides a feeder mater gala-pitetsl (see Fig. 6). The length of the bottom surface of the feeder is 400 mm. The solid pads 20 on both sides of the bottom surface of the feeder are adjusted so that the distance between its surface and the surface of the tape is 5 mm. Each of the caps 19 has a wall thickness of 0.6 mm and an outer diameter of 8 mm, and it is a tube made of polyvinyl chloride. contains 60 weight.h. dibutyl phthalate as a plasticizer. Seals are fed from both sides of the top and surface of the head with a distance of 750 mm between their centerline at a speed of 10 cm / min. The liquid polymer material is fed through a polyethylene pipe by a pump, providing a continuous flow at a rate of 150 cm / min, to a feeder for supplying the polymerized liquid. The clamping force for carrying out the clamping (by groups of sub-rollers located in front of the polymerization zone) of the continuous conveyor belts is adjustable. At the same time, the length of the reverse flow of the fluid is about 4 cm (the external hydraulic pressure was 2 cm). The result is a smooth and flat transparent sheet of acrylic resin with a thickness of 2 ± 0.2 mm and a satisfactory outdoor appearance. By increasing the clamping force for clamping groups of hudderzhivat roll rollers of a continuous conveyor (so that the internal hydraulic pressure is 10 cm without changing the material and f.d.), the length of the reverse flow of fluid on the bottom surface of the belt measure up to 25 cm. As a result, a more uniform lns1 with a thickness of 2 ± 0.15 mm is obtained. Next, 1% of a viscosity of about 12 poises was prepared to the first shaker, prepared by changing the already mentioned material with the addition of 3% milky white copolymer, containing styrene and methyl methacrylate in a ratio of 6: 4; and very small amounts of titanium oxide. In addition, the clamping force for clamping the support rollers of the continuous conveyor belt with rpyaips is increased so that the internal hydraulic pressure is 20 cm and the followers are, the return flow along the bottom surface of the feeder is about 25 cm. As a result, the thickness uniformity is improved and a white milk sheet Acrylic resin has a crowd of 2 ± 0.1 mm and a satisfactory appearance. After operating the device for two months, only a thin film of material with a thickness of 0.2 mm was formed near the front stream. FIG. 6, it can be seen that on the side of the upper endless belt, where the following is supplied: an identical polymer material, a composite, in itagedde 13 there is an exit slit 14, the material of which flows. This gap is made in the manner that uuitMiiia material flow at the front end of the feeder becomes less than the width of the sheet, i.e. distance between two seals P1 mi. FIG. Figure 7 shows the calculation of which width can be a flow of liquid material. In the example of FIG. Figure 7 shows the state of the materiel in the space between the bottom of the feeder for feeding the material and the bottom of the conveyor. The rectangle shows the front surface of the feeder, and the PP 11 shows 1) The front end of the feeder. Line RR shows the fill width of the liquid material. Filling width asc is indicated by LF. The RSTTSR rectangle shows the range of the reverse flow of material in the case when it is assumed that no flow occurs in the transverse direction. Since the lines that run parallel to the PP line are too large of the same pressure, the hydraulic pressure decreases from RR and SS and to the TT linearly, and the hydraulic pressure becomes a bullet pressure. at the front end of the reverse flow. For backflow, RT is expressed in terms of LB-This length of LB is defined in the following equation where K is a constant 1sh, 160-300, C is the gap between the supporting or lower surface of the feeder and the supporting surface of the upper bottom of the continuous conveyor.

where 7 is fluid viscosity,

h is the depth of the liquid material at the front end of the PP feeder for feeding the material, cm;

V is the speed of movement of continuous lung conveyors, cm / sec.

In this equation, the definition of the length value is introduced due to the fact that within the practically used interval of values of this length in a wedge-shaped feeder, the reverse flow in the gap is in the state of laminarity, and the interval of values of constant K is determined on the basis of a number of specially performed experiments. The reverse flow rate on the RR line is higher than the pa of the SS line, and the flow rate on the SS line is higher than on; TPai TT (but equal to the belt speed)

Double lines indicate seals 19. These seals can be supplied from either side of the material feed feeder, although there is no need to seal both sides of the feeder. However, since The side on which the feeder can rest temporarily across its entire width is filled with material, for example, when starting the MBTepnajia feed feeder or when it stops, therefore let the radius climb up the gaskets 1 from the bottom.

Formula and Gaining Device for continuous casting of sheet material, containing located on top of the other, envelope pulleys of conveyor belts forming between themselves a horizontal molding cavity, bounded laterally by tape slips, set in a linear movement in the direction of the moving conveyor belts, and a feeder for feeding i polymerized liquid and molding cavity, located on the site of the lower conveyor belt, protruding beyond the upper conveyor belt , characterized in that, in order to ensure a constant thickness of the sheet material, the feeder is installed in a wedge-shaped gap formed by the horizontal surface of the lower conveyor belt and the curved surface of the upper conveyor belt, the envelope pulley, and is made wedge-shaped, corresponding to the wedge-shaped gap, and the exit slot of the feeder located on its top face

 width, shorter distance between side belt seals.

Sources of information taken into account in the examination:

1. US patent No. 2500728, CL. 264-22, 1950.

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