SU1638128A1 - Device for making fibres of thermoplastic material - Google Patents

Abstract

A device for producing fibers from a thermoplastic material belongs to the building materials industry and can be used in enterprises producing continuous glass fibers. The invention is aimed at reducing the specific consumption of platinum. In a device for producing fibers from a thermoplastic material, insulating gaskets are located only on the part of the ribs that are supporting, the ratio of the distance between any two adjacent supporting ribs to the length of the filter plate is 0.5-0.09, the ratio of the thickness of the supporting ribs to the thickness of the non-supporting 2-4, non-supporting edges are cut in the middle and the ratio of the width of the gap formed to the distance between any two adjacent spinnerers is 0.5-0.8. 2 Il.

Description

The invention relates to the building materials industry, in particular to the equipment of glass fiber factories.

The purpose of the invention is to reduce the specific consumption of the plate.

Figure 1 shows a device for producing fiber, a general view; figure 2 - section aa in figure 1.

A device for producing fibers from a thermoplastic material, preferably glass, contains a spinnere feeder 1 with a spinneret plate 2, equipped with spinnerets 3, located below the spinnere plate cooled circuit 4 with ribs 5 rigidly fixed in it and insulating gaskets 6 located in grooves on upper edges of edges 5.

The ribs 5 with insulating spacers 6 are supporting elements, and the ribs screens 7 without spacers are not supporting and are cut in the middle.

The device works as follows.

The molten glass mass 8 enters the feeder 1 through the slot in the upper part and then flows out of the nozzles 3 as separate thin streams, which are then stretched and solidify, forming fine fibers 9.

The fiber is molded to produce a significant amount of heat, most of which is absorbed by ribs without gaskets located between the rows of nozzles and discharged through the cooled circuit.

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In operation, the die plate bends strongly, which leads to its rapid destruction. To prevent this phenomenon, the spinneret plate rests on rigid supports, which use cooling ribs.

To ensure the required stability of the die plate, it is not necessary to make all the ribs supporting. It is enough to use for these purposes some minimum required quality, which depends on the dimensions, material and design of the die plate, and to install between them sections of the rib-screen without gaskets with a gap in the middle.

Insulating spacers are installed between the surface of the die plate and into the grooves of the upper rib screens to prevent electrical contact between them.

At the same time, the optimum ratio of the distance between two adjacent screen fins to the length of the die plate, determined experimentally, is in the range of 0.09-0.25. If this ratio is greater than 0.25, then the deflection of the die plate becomes so large that it leads to a malfunction 3-4 days after the start of its operation. If the ratio is less than 0.09, then due to the increase in the number of support rib screens, the dimensions of the feeder increase dramatically, which leads to an unproductive consumption of platinum and reduces the stability of the production process.

Ribs without shims, the thickness of which is not limited by the die size, are 2-4 times smaller than the shield ribs, which allows, while maintaining the required intensity of heat removal in the underfilter area, significantly reduce the size of the die plate and increase the density of dies. on the die plate. If the ratio is less than 2, then the dimensions of the spun plate and, accordingly, unproductive consumption of platinum increase dramatically, and if it is more than 4, they become very thin and do not provide the required intensity of heat extraction, which leads to a decrease in performance and an increase in the specific consumption of platinum, and besides Moreover, the temperature of these edges-screen

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may exceed the maximum allowable for the material from which they are made, with the result that they are destroyed.

Absorbing the heat that is released during the formation of glass fiber, the ribs-screens are heated and their thermal elongation occurs, and the degree of heating and, accordingly, the values of elongation are determined mainly by the thickness of the ribs of the screens without gaskets. As the experiments show, with the thickness of the support rib-screen located within the limits indicated above, its thermal elongation is small and does not require special compensation.

For rib screens without gaskets, the thickness of which is 2-3 times less than the thickness of the rib screens, due to the large thermal resistance, the temperature is much higher, so the elongation is sufficiently large and requires compensation. To this end, it is proposed to cut them in the middle. In this case, a gap is formed in the middle, the ratio of the magnitude of which to the distance between any two adjacent dies is in the range of 0.3-0.5. If it is more than 0.5, then normal cooling of the fiber located in the area of the gap is not ensured, which leads to a decrease in productivity, and if the ratio is less than 0.3, then the gap does not compensate for the thermal elongation of the ribs, resulting in their shortening, and the process molding is broken.

Experimental studies of the device for producing fibers showed that, compared with the known device, the proposed device has a high density of spinnerets, which makes it possible to reduce the specific consumption of platinum by 15-25% due to compaction of the spinnerette floor.

Claims (1)

Invention Formula A device for producing fibers from a thermoplastic material, mainly glass, including a feeder with a draw plate, located below the last cooled circuit with ribs-screens fixed in it and insulating gaskets located in the grooves on the upper edges of some edge screens, characterized in that in order to reduce the specific consumption of platinum, the ratio of the distance between two adjacent rib screens with insulating spacers to the length of the die plate is 0.09-0.25, the ratio of their thicknesses to the the thickness of the rib screens without shims is 2-4, and the ratio of the width of the gap between the free ends of the latter to the distance between any two adjacent dies is 0.3-0.5. Water 1