CN112746363B

CN112746363B - Method for improving POY (pre-oriented yarn) tail passing rate

Info

Publication number: CN112746363B
Application number: CN202011574775.1A
Authority: CN
Inventors: 施玉琦; 尹立新; 王丽丽; 王力军; 沈丽; 沈林; 范兢磊; 陈婷婷; 唐翻
Original assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Current assignee: Jiangsu Hengli Chemical Fiber Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-05-10
Anticipated expiration: 2040-12-28
Also published as: CN112746363A

Abstract

The invention relates to a method for improving the tail passing rate of a POY (polyester pre-oriented yarn), which is characterized in that when the POY is spun, the network pressure of a network device is controlled to be more than 0.9bar, network points are formed on POY bottom layer threads with the initial length of 0-60000 m, the network pressure of the POY bottom layer threads with the initial length of 0-60000 m corresponding to the network device is 0.9-1.5 bar, the network pressure of the POY threads with the rest part corresponding to the network device is 0.3-0.7 bar, the number of the network points is 1-10/m, all the network points on the POY bottom layer threads are uniformly distributed, and the obtained POY has the elastic tail passing rate of more than 95%. The invention greatly improves the ratio of springing and tail passing through by a mode of weaving the network points on the POY bottom layer, and the POY tail passing and end breaking of the network points is reduced by more than 50 percent compared with the POY without the network points.

Description

Method for improving POY (pre-oriented yarn) tail passing rate

Technical Field

The invention belongs to the technical field of spinning, and relates to a method for improving the tail passing rate of a POY (polyester pre-oriented yarn), in particular to a method for improving the tail passing rate of a POY (polyester pre-oriented yarn) by arranging network points on a POY bottom layer yarn during POY spinning.

Background

In post-processing of polyester pre-oriented yarn POY, the tail yarn of one POY winding spinning cake is connected with the head of another POY winding spinning cake to ensure the continuous production, and the transition process is generally called tail transition. In the production process of polyester POY, the improvement of the tail passing rate is one of the difficulties which troubles the POY production management. In recent years, polyester plus stretch yarn DTY adopts a POY tail-passing and non-doffing operation mode in order to reduce labor cost, so that the POY tail-passing and yarn breakage not only influences the DTY production efficiency and improves the labor capacity of workers, but also directly influences the DTY full-rolling rate, and the DTY has higher and higher requirements on the tail-passing rate. There are many factors that affect the over-tail rate, such as the quality of POY products, the quality of paper tubes, equipment factors, etc. Under the premise of ensuring the normality of external factors such as equipment, paper tubes and the like, the POY tows have better cohesion and are beneficial to improving the DTY tail passing rate. The conventional method is to improve the oil content of the POY tows to improve the cohesion of the tows, but the maintenance period of the DTY hot box is shortened when the oil content of the POY tows is too high, and the upper limit of the oil content of the POY tows is limited. In the prior art, pre-oriented polyester POY (polyester pre-oriented yarn) has no requirement on existence of network points, and the function of a network device is generally to improve the homogenization of an oiling agent so that the POY has no network points. After long-term groping, the POY silk bundle without network points is dispersed, when the DTY passes the tail, the POY bottom layer yarn and the surface of the paper tube are obviously rubbed, the silk bundle is easily broken due to the dispersion of the silk bundle, and the number of broken yarns after passing the tail is increased.

Disclosure of Invention

The invention aims to solve the technical problem of low POY (polyester pre-oriented yarn) over-tail rate in the prior art, and provides a method for improving the POY over-tail rate, in particular to a method for improving the POY over-tail rate by arranging a network point on a POY bottom layer yarn during POY spinning.

The invention aims to provide a method for improving the over-tail rate of POY (pre-oriented yarn), which increases network points to improve the cohesion of tows and improve the over-tail rate of texturing.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for improving the tail passing rate of POY (polyester pre-oriented yarn) yarns comprises the steps of marking network points on POY bottom yarns with the initial length of 0-60000 m when spinning POY yarns; the tow of the part directly contacted with the paper tube surface paper is about 100m, basically the tow with more than 100m is the contact of the tow and the filament, according to the important relation, the requirement of 0-100 m is the highest (most important), then the length of 100m to the tube diameter of 154mm, if the converted length is 100 m-60000 m, the range of the bottom layer filament is 124 mm-154 mm, and the converted length is 0-60000 m.

The number of the network points is 1-10/m; generally, 1-10 network points/meter can be printed, the appearance is normal, the air consumption is high when the number exceeds 10/meter, and the appearance problem (looping yarn) is easy to occur;

the obtained POY yarn has a texturing and tailing-passing rate of more than 95%.

As a preferred technical scheme:

according to the method for improving the tail passing rate of the POY yarns, the network points on the POY bottom yarns are uniformly distributed.

According to the method for improving the over-tail rate of the POY yarns, the number of the network points is 1-3/m.

In the method for improving the over-tail rate of the POY yarn, the outer diameter of the paper tube of the POY yarn is 124mm, and the maximum package diameter of the winding machine is 440 mm.

According to the method for improving the tail passing rate of the POY yarns, the method for forming the network points on the POY bottom yarns is to control the network pressure of a network device to be more than 0.9 bar.

According to the method for improving the tail passing rate of the POY yarns, the network pressure of the POY bottom layer yarns with the initial length of 0-60000 m corresponding to the network device is 0.9-1.5 bar, and the network pressure of the POY yarns in the rest part corresponding to the network device is 0.3-0.7 bar.

The method for improving the tail passing rate of the POY yarns comprises one or two networers.

The method for improving the over-tail rate of the POY yarn has the specification of 30-350 dtex/12-288 f. On the premise of the same network device and the same network pressure, the larger the single fiber number is, the more difficult the single fiber number is to form the network points, and the smaller the single fiber number is, the more easy the single fiber number is to form the network points. Fine-denier porous yarns of 54dtex/24f, 54dtex/36f, 54dtex/48f, 88dtex/36f, 88dtex/96f and the like are easier to form network points. Other heavy denier yarns can also increase the springing tail-passing rate by increasing the network pressure to obtain network points.

According to the method for improving the over-tail rate of the POY yarns, the roll diameter of the POY yarn cake is 124-440 mm, wherein the roll diameter is 124-154 mm, and the POY yarn cake is the bottom layer yarn.

Has the advantages that:

(1) when the POY is spun, the POY bottom layer filaments with the initial length of 0-60000 m are subjected to network point spinning, and the POY with the network points is reduced by more than 50% when passing through tails and breaking ends compared with the POY without the network points;

(2) only the POY bottom layer wires are provided with network points, and the POY bottom layer wires are switched to POY wires without network points during large-volume rolling, so that the DTY requirements can be met, the tail passing rate of the texturing can be improved, and the air consumption of network compressed air can be reduced.

Drawings

FIG. 1 is a schematic diagram showing the relationship between components for increasing the tail-crossing rate of POY yarn;

FIG. 2 is a schematic diagram of a position of a cross-over device for increasing the tail-crossing rate of POY;

the device comprises a computer 1, a winding machine 2, an electric signal line 3, a network compressed air electromagnetic valve I4, a network compressed air electromagnetic valve II 5, a network device I6, a network device II 7, a network compressed air pipe I8, a network compressed air pipe II 9, a godet I10, a godet II 11 and a POY tow.

Detailed Description

The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

A method for improving the tail passing rate of POY (pre-oriented yarn) yarns, wherein the outer diameter of a paper tube of the POY yarns is 124mm, the maximum package diameter of a winding machine is 440mm, the package diameter of POY yarn cakes is 124-440 mm, the package diameter range is a switching empty range, the full package diameter of the POY yarn cakes is 430-435 mm, and the specification of the POY yarns is 30-350 dtex/12-288 f; when the POY yarns are spun, the network pressure of the POY bottom layer yarns with the initial length of 0-60000 m corresponding to the network devices is controlled to be 0.9-1.5 bar, the network pressure of the POY yarns of the rest corresponding to the network devices is controlled to be 0.3-0.7 bar, one or two network devices are used, the number of the network points arranged on the POY bottom layer yarns is 1-10/m, and the network points are uniformly distributed.

The final POY yarn has a tail-passing ratio of more than 95%.

In the prior art, a network pressure-air electromagnetic valve switch is controlled by the running conditions of a godet I and a godet II. When the godet I and the godet II are in the operation process, the network pressure air electromagnetic valve is opened, and network pressure air is continuously provided for the network device. When the godet I and the godet II are stopped, the winding machine table and the computer thereof provide instructions for the network air-compression electromagnetic valve, and the network air-compression electromagnetic valve is closed, so that the effect of saving air consumption of compressed air is achieved. Because the POY wire has no requirement on a network point, in the conventional production process, the network air pressure is generally controlled to be 0.3-0.7 bar (the network pressure control size is different when the type of a network device and the specification of a product are different), if the network point is added to the POY wire, the network pressure is at least increased to be more than 0.9bar, and the air consumption of the network air pressure is greatly increased in the prior art.

When the DTY passes the tail, the requirement is only on the network point of the POY bottom layer wire, and the requirement is not on the network point of a large roll POY with the roll weight of more than 2.5KG and the roll diameter of more than 170 mm. The POY network dotting test also shows that the network dotting obviously improves the DTY tail-passing success rate, but the large-coil end-breaking rate does not decrease, but tends to increase. According to the DTY, from the aspects of DTY use requirements and reduction of compressed air consumption, only the POY bottom layer yarn is subjected to network point punching, and the POY without the network point is automatically switched when a certain winding diameter is reached, so that the DTY tail-passing success rate can be improved, and the compressed air consumption of the network can be reduced.

As shown in fig. 1-2, the POY filament bundle 12 reaches the winding machine 2 through a filament guiding disc i 10, a networker ii 7, a filament guiding disc ii 11 and a networker i 6 for package forming, the networker i 6 is connected with one end of a network compressed air electromagnetic valve i 4 through a compressed air pipe, the other end of the network compressed air electromagnetic valve i 4 is connected with a network compressed air pipe i 8, and the network compressed air electromagnetic valve i 4 is connected with the winding machine 2 through an electric signal line 3. And the network II 7 is connected with one end of a network compressed air solenoid valve II 5 through a compressed air pipe, the other end of the network compressed air solenoid valve II 5 is connected with a network compressed air pipe II 9, and the network compressed air solenoid valve II 5 is associated with the winding machine table 2 through an electric signal line 3. On the basis of original equipment, when keeping godet I10 and godet II 11 to stop, the function that network pressure air solenoid valve I4 and network pressure air solenoid valve II 5 were all closed adds the setting control of the footpath scope: send the signal of telecommunication to the network pressure empty solenoid valve through coiling board 2 and computer 1, make network pressure empty solenoid valve I4 and network pressure empty solenoid valve II 5 switch, the roll footpath scope is set for in 124mm ~ 154mm (the paper tube diameter is 124mm, 124mm is the minimum roll footpath promptly), when roll footpath in this within range network pressure empty solenoid valve I4 switch, network pressure empty solenoid valve II 5 is closed, when roll footpath exceedes this scope (roll footpath is greater than 154mm), computer 1 assigns the signal of telecommunication instruction, control network pressure empty solenoid valve I4 and network pressure empty solenoid valve II 5 switch, make network pressure empty solenoid valve I4 close, network pressure empty solenoid valve II 5 opens. After the POY spinning cake full-roll switching, if the winding machine table 2 continues to operate, the roll diameter falls between 124mm and 154mm again, the network air pressure electromagnetic valve I4 and the network air pressure electromagnetic valve II 5 continue to be switched, the network air pressure electromagnetic valve I4 is switched on, the network air pressure electromagnetic valve II 5 is switched off, when the roll diameter is larger than 154mm, the network air pressure electromagnetic valve I4 and the network air pressure electromagnetic valve II 5 are switched again, the network air pressure electromagnetic valve I4 is switched off, the network air pressure electromagnetic valve II 5 is switched on, and the operation is repeated. When the winding machine table 2 stops, the network air pressure electromagnetic valve I4 and the network air pressure electromagnetic valve II 5 are closed simultaneously.

The following is illustrated by the production examples:

the POY specification is 54dtex/24f, the control network pressure is 0.55bar during production, no network points exist, tows are loose, the tail-added and yarn-broken yarn is fed into 23/machine, the number of the draw texturing machines is 240 spindles, and the tail-added and yarn-broken rate is 90.4%; increasing the net pressure of the net device from 0.55bar to 0.9bar, making the POY tows pass through the net device I6 to start to form net points with the net points of 2/m, and arriving at the winding machine 2 for package forming, when the net points are 2/mSpinning cakeAnd when the roll diameter is larger than 154mm, switching the network pressure to 0.55bar, stopping beating network points until the package is finished, reducing the tail broken yarn of the obtained POY spinning cake to 7 yarns per machine during elasticizing production, and increasing the elasticizing tail-passing rate to 97.1%.

Claims

1. A method for improving the tail passing rate of POY (pre-oriented yarn) is characterized by comprising the following steps: when spinning POY (polyester pre-oriented yarn), punching network points on the POY bottom layer yarn with the initial length of 0-60000 m;

all network points on the POY bottom layer wire are uniformly distributed;

the number of the network points is 1-10/m;

the network pressure of the POY bottom layer filaments with the initial length of 0-60000 m corresponding to the network device is 0.9-1.5 bar, and the network pressure of the POY filaments with the rest corresponding to the network device is 0.3-0.7 bar;

2. The method for improving the tail crossing rate of the POY yarns as claimed in claim 1, wherein the number of the network points is 1-3/m.

3. The method as claimed in claim 1, wherein the POY yarn has a paper tube with an outer diameter of 124mm and a maximum package diameter of 440 mm.

4. The method for increasing the tail crossing rate of the POY yarns as claimed in claim 1, wherein the number of the networkable is one or two.

5. The method for increasing the tailing ratio of POY yarns as claimed in claim 1, wherein the POY yarns have a size of 30 to 350dtex/12 to 288 f.

6. The method for improving the tailing ratio of the POY yarns as claimed in claim 3, wherein the POY yarn cake roll diameter is 124-440 mm.