SU1523372A1 - Apparatus for moulding strip polymeric material - Google Patents

Abstract

The invention relates to the processing of polymeric materials into articles and can be used to continuously form sheets of various polymeric materials, in particular, laminated plastics. The purpose of the invention is to improve the quality of the material by making it possible to increase the pressing pressure without increasing the energy intensity of the device. For this pressure chamber, 12 to 15 are associated with means 16 to 19 for supplying the working medium under pressure. The clamping elements 9-11 are made with throttling channels 21. The latter are made expanding towards the belts 1 and 2. In the channels 21, spring-loaded rods with valves are placed. At the working ends of the clamping elements are made drainage grooves, and plates 7 and 8 - drainage channels for removal of the spent working environment. Pressure chambers are grouped with individual means for supplying the working medium. The working medium from the pressure chamber through the throttling channels 21 enters the belts 1 and 2, which ensures their temperature control, pressure transmission and reduces the frictional force between the belts and plates. 8 hp f-ly, 4 ill.

Description

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The invention relates to the processing of polymeric materials into articles and can be used for the continuous molding of sheets from various polymeric materials, in particular laminated plastics.

The purpose of the invention is to improve the quality of the material by making it possible to increase the pressing pressure without increasing the energy intensity of the device.

FIG. 1 schematically shows the proposed device; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 - a fragment of the clamping element with a cut along the throttling channel.

A device for forming a tape polymer material contains floor-standing drive endless metal bands 1 and 2, envelopes 3, 4 and 5, 6, and pressing plates 7 and 8. Drums 3 and 5 are driven and have electric heaters (not shown). The pressing plates 7 and 8 have clamping elements 9-11 of various shapes and pressure chambers, grouped in groups 12-15, having respectively individual means 16-19 for supplying the working medium under pressure.

The clamping elements are mounted for movement in the perpendicular plane of the working branches of the belts 1 and 2. Seals 20 are placed between the plates and the clamping elements along the perimeter of the latter. The clamping elements are made with throttling channels 21 for communicating pressure chambers 12-15 with the space between the belts 1 and 2 and the working ends of the plates 7 and 8. The throttling channels 21 are wedged in the side of the tape and they placed rods 22. The latter are equipped with valves 23 and springs 24.

At the working ends of the clamping elements have a wear-resistant anti-friction coating and drainage grooves 25, located obliquely to the longitudinal axis of the endless belts. At the working ends of the plates 7 and 8 along the boundaries of the pressure chamber groups of the dimensions, barrage seals 26 are installed. The plates 7 and 8 have drainage channels 27 for removing the spent working medium.

To limit the movement of the clamping elements 11 in the pressure chamber 15, there are stops 28. The clamping elements in one of the pressure chambers can be prevented from moving.

The device works as follows.

The drive drums 3 and 5 are heated to a predetermined temperature, their drives are turned on and the billet 29 of the moldable material is fed into the gap between the drums 3 and 5, where it is sealed and heated, and then is fed to the zone of the pressing plates 7 and 8 from the

the blower by means of means 16 and 18. The working medium — a lubricating thermostating fluid, an emulsion, an oil, or a silicone fluid depending on the pressing temperature — is supplied to the chambers 12 and 14 of the plates. The working medium is pre-cleaned of particles in the filter and heated in the heat exchanger to a predetermined temperature. Under the pressure of the working medium flowing into the chambers 12 and 14, the clamping elements 9 and 10 are pressed against the belts 1 and 2, the springs 24 compress and move the rods 22 with the valves 23, opening the throttling channels 21. The medium enters the space between the working ends plates and tapes, which ensures the temperature control of tapes, the transfer of pressure, the protection of tapes and clamping elements from wear, reduces the force of friction when moving tapes. The diameters of the compensating rods and throttling channels and the spring stiffness are determined depending on the viscosity of the medium and the pressing pressure. Seals 26 prevent leakage to the outside and into the area of the pressure elements 11 of the medium, which is led through the drainage channels 27 to the intake pipe of the supercharger.

v3a, the transit time of the ribbons with the workpiece 29 between the pressing elements 9 and 10, is pressed (compaction of the structure and stress relaxation for materials based on thermoplastics or polymerization for materials based on thermosetting resins). When the belts are moved through the pressure chambers 13 and 15 in the area of the pressure elements 11, the material is compacted and thermostatically by supplying the working medium from another blower through the means 17 and 19. Another type of medium or other may be used.

, pressure and temperature. The spent working fluid through the drainage grooves 25 and channels 27 returns to the supercharger. Pressure chambers can have several zones of different lengths, with different pressing parameters depending on the properties

5 formable material 30.

Claims (9)

1. Ribbon forming device-. polymeric material containing 0 storey drive endless belts and pressing plates having pressure elements installed with the possibility of movement, pressure chambers and means for supplying the working medium under pressure, characterized in that 5 of increasing the quality of the material due to the possibility of increasing the pressure of pressing without increasing the intensity of the device, the pressure chambers are connected to means for supplying the working medium under pressure, and the clamping elements are made with throttling channels for communicating the pressure chambers with the space between the working ends of the plates and the belts. 2. A device according to claim 1, characterized in that the throttling channels are made expanding towards the tapes. 3. The device according to claim 2, characterized in that spring-loaded rods are placed in the throttling channels. 4. The device according to claim 3, characterized in that the rods are provided with valves. 5. The device according to claim 1, characterized in that drainage grooves are made at the working ends of the clamping elements. 6. The device according to claim 5. characterized in that seals are placed between the plates and the clamping elements along the perimeter of the latter. 7. The device according to claim 1, characterized in that pressure chambers are grouped into having individual means d, 1 supply of working medium. 8. The device according to claim 7, characterized in that at the working ends of the plates along the boundary of the groups placed enclosures. sealed seals. 9. The device according to claim 8, characterized in that drainage channels are made in the plates for removal of the-waste working medium. eight 26 9  I about/ ABOUT 21 eleven ten  / 7 7 / I 21 FIG. 25 77 go Fy