CS232311B1 - Processing of roving - Google Patents

Abstract

The invention relates to a method of producing roving in a carding spinning mill, where the roving is guided from the belt dividing device over at least two pairs of rounding belts arranged one behind the other in the direction of the roving passage. The web from the second or third carding machine is fed by fleece dividing belts onto flat rovings, which are rounded by passing between the rounding belts and wound onto roving rollers. High-quality roving is achieved, among other things, by setting the distributor to a minimum draw so that the roving is uniform. The roving is processed into yarn, for example, on a ring spinning machine. Some types of ring spinning machines have high-drawing devices that draw the roving by up to 100%, while other types of ring spinning machines operate with less draw - up to a maximum of 25%. Also in double-twist spinning, where there is no draw, a roving must be provided whose fineness is essentially equal to that of the resulting yarn. If carding machines are to meet the need for roving for double-twist finishing machines or for ring finishing machines with low draw, they have a narrow production profile, their production is sufficient to supply the finishing machines. This deficiency can be eliminated by a method of roving production, where the roving is guided from the belt dividing device over at least two pairs of rounding belts arranged one behind the other in the direction of passage of the roving, the essence of which according to the invention is that the roving is stretched between the two roundings.

Description

The method of producing roving according to the invention can achieve a significant increase in the production of carding composition in a carding spinning mill. With an optimal weight of material fed into the carding machine, the fineness of the resulting roving can be freely selected by including a larger number of draw-offs.

According to calculations, based on tests carried out, yarn production can increase by 60 to 80%.

The advantages of the method of producing a skein according to the invention will be highlighted in the following example, schematically illustrated in the drawing.

The web from the carding machine is guided between the upper and lower rollers of the belt distribution device where it is divided into individual rovings. These flat rovings are picked up by the first pair of rounding belts 2, between the rounding belts g the rovings are rounded, densified and strengthened. After passing through the rounding belts 2 the rovings are guided into a drawing device g, for example a roller with a needle roller, where the rovings are refined by drawing, which occurs as a result of the mutual displacement of the fibers by their distribution over a greater length.

The drawn yarn is then further strengthened by passing through another pair of rounding belts 2. There may be more of these pairs of rounding belts 2 and between them the yarn is drawn to a higher fineness in further drawing devices £. The yarn is then wound up by a winding mechanism 4.

In another embodiment, the roving, after rounding, is drawn by passing through two or more drawing devices J of the same or different type arranged one after the other, and then rounded again and wound up.

Further advantages of the method of producing yarn according to the invention are apparent from the examples given below.

Example

Table 1 shows the production of rovings for fine yarns in the existing method and according to the invention. By reducing the number of fleece dividing belts to 130 pieces using a draw 2, it is possible to achieve an increased production of 60% on the carding composition.

A web of higher basis weight is formed on the carding unit, divided by the number of belts into a primary roving, which is refined to the required roving number by drawing, rounded and compacted by rounding belts. The primary roving produced at a working speed of 30 m.min” ¹ is increased to 60 as.min' ¹ by drawing.

The existing machinery allows for the production of skeins in the range of 140 - 70 tex (cm 7 - 14) with 160 pieces of straps. According to the new method, the machinery allows for the production of skeins in the range of 140 - 40 tex (cm 7 - 24) with 130 pieces of straps. The advantage of this system is that it allows for the production of skeins for yarns up to 40 tex - see table δ. I. The device according to the invention allows for the processing of textile fiber materials commonly used in carded yarn spinning mills for the production of yarns in terms of types, types, fineness, lengths, mutual mixing ratios, including the use of secondary raw materials.

Example 2

The production of medium fine carded yarn differs from the fine carded yarn from example 1 only in that a dividing device with 96 fleece dividing belts is used in the production. The amount of draw and the increase in production are the same as in example 1.

A fleece splitting device with 96 belts enables the production range of rovings in the range of 200 - 70 tex (cm 5 - 14) and overlap of roving production in example 1. The classic device enables production only in the range of 200 - ,00 tex - see table no. II.

Example 3

The production of coarse carded yarn differs from the production of carded yarn from example 1 or 2 in that there are 60 dividing belts and the same number of outlets/discharge points in the fleece separating device.

The range of fineness of carded yarn production in this example is so large that it reaches the lower limit of skein production for 140 tex yarn in example 1 - see table S. III.

Example 4

The production of very coarse carded yarn differs from the embodiments of Examples 1, 2 or 3 in that

The fleece splitting device contains 40 pieces of fleece splitting belts and outlets. For the production of skeins for yarns of 1,000 - 1,330 tex (Srn 1 - 0.75), it is possible to use a 1.5-fold draw. From skeins for yarns of 1,000 - 500 tex, a 2-fold draw - see table S. IV.

Tahulkal

Number of outlets pcs Fineness of yarn in tex Working speed in m.min ^- t input output Production Load Stretching Weight of spider web in gm ^-2 Note machines in kg. hour ^- ' drum head in gm ^-2 input [ output 160 0.070 0.070 30 30 20.16 0.2476 t 5.83 old friend- 160 0.140 0.140 30 30 40.32 0.4951 1 11.66 reindeer 130 0.080 0.040 30 60 18.72 0.2299 2 5.41 according to the invention 130 0.280 0.150 30 60 65.52 0.8046 2 18.95 I am climbing Table II

Number of outlets pcs yarn fineness in tex input output Working speed Production Load Draw Weight Note in m.min ^- input output machines in the main drum spider webs in gm ^-2 kg.hour ^- in gm ^- * 120 0.2 0.2 30 30 43.20 0.5305 1 12.50 old fashioned 120 0.1 0.1 30 30 31.60 0.2653 1 6.25 reindeer 96 0.4 0.2 30 60 69.12 0.8488 2 20.00 according to the invention 96 0.14 0.070 30 60 24.19 0.2971 2 7.00 I am climbing Table III

Number of outlets pcs Yarn fineness in tex input output Working Speed Production Load Draft Weight Note of web in gm ^-2 in m.min ^- C input output machines in kg.hours ^- drum head 'in gm ^-2 80 0.5 0.5 30 30 72.00 0.8842 1 20.80 old friend- 80 0.2 0.2 30 30 28.80 0.3537 1 8.33 reindeer 60 1.0 0.5 30 60 108.00 1.3263 2 31.25 according to the invention 60 0.280 0.140 30 60 31», 20 0.3714 2 8.75 I am climbing

Table IV

Number of outlets Fineness of yarn Working speed Production Load Draw Weight Note in tex in m.min ^- machines in main drum of web

-1-2 -2 pcs input output input output kg.hour in g.m in g.m

40 2 ',33 23.0 34.5 121.44 1.4913 1.5 41.66 according to the invention 40 1.5 1.00 30.00 45.00 108.00 1.3263 1.5 31.25 I am climbing 40 1.0 0.5 30 60 72.00 0.8842 2 20.80 40 0.4 0.2 30 60 28.00 0.3537 2 8.33

SUBJECT OF THE INVENTION

Claims (1)

SUBJECT OF THE INVENTION A method for producing a yarn in a carded spinning mill, wherein the yarn is guided from the strap cutting device through at least two pairs of rounding strips arranged one behind the other in the direction of the yarn passage, characterized in that the yarn extends between the two rounds.