Raw Material Spandex Face Mask Earloop Cord Elastic Making Machine

Machine model: Dt2020

Machine name: Mask rope crochet knitting machine

Machine size: 5m * 12m * 1.8m

Material: Polyester + Spandex / Nylon + spandex

Size: 2.8-5mm

Color: white

Pattern: round / flat

This round / flat elastic band is suitable for all kinds of facial mask hanger, mask elastic band, KN95 mask, FFP2 elastic earring, fluffy hat elastic belt, doctor cap elastic belt, medical mask elastic band, tubular elastic earring, gloves elastic band, facial mask elastic rope, mask bungee jumping, surgical mask earring.

Information about textile industry

The yarn defects generated in the spinning process generally have two types: normal yarn defects and sporadic yarn defects. Frequent yarn defects are generally sliver CV, kilometer thick knots, kilometer details and kilometer neps; occasional yarn defects are mainly 100,000 meters of harmful yarn defects, with emphasis on long thick knuckles and long details, and can be clear Qualitative yarn defects. Yarn defects caused by equipment factors are between the two. They have frequent features and occasional manifestations. They are mainly caused by mechanical defects during mechanical operation. They are common and sudden, and are not easy to detect and control. Harmful, affecting yield and quality. The specific types are: spinning without aprons, uneven mechanical waves, thick knuckles, staggers caused by mechanical variation, and hairiness yarn defects.

2.1 No yarn defects in spinning

2.1.1 Morphological comparison

Spinning without aprons is caused by uncontrolled equipment maintenance and operation management during the production process. It produces a regular 7-8 cm mechanical wave, which has a great influence on the fabric and is not easy to find in actual production. The specific quality indicators are shown in Table 1. (CJ28.5 tex variety).

2.1.2 Mechanism analysis

In the drafting movement of the spun yarn, the upper and lower aprons form elastic jaws, which hold the fibers in an orderly shift, and focus on the forward jaws. When spinning without aprons, only the aprons control the fibers, the slip ratio of nitrile rubber and steel roller increases, and the diamond-shaped pattern of the middle and lower rollers reduces the ability to hold the fibers, resulting in fluctuations, resulting in yarn The influence of mechanical periodic motion produces regular unevenness.

2.1.3 Causes and prevention

Reasons for spinning without aprons:

(1) The operation of the lower apron pin is inflexible and offset, causing the apron to run off or fall off;

(2) The inner wall structure layer and supporting layer of the apron are worn, resulting in fracture and deformation, which causes damage to the apron; (3) The temperature and humidity are too large, and the apron is wrapped, hanged, and wounded, causing the apron to be damaged and broken, and not replaced in time Aprons.

Prevention method:

(1) Strengthen maintenance, regularly check the quality of the apron, and replace it if it is found to be unqualified;

(2) Strengthen basic management, ensure the temperature and humidity during operation, and reduce the phenomenon of entanglement, hanging and winding;

(3) Strengthen the education of responsibility for the operator, and replace it in time after finding the damage.

2.2 Mechanical wave caused by breaking of upper pin snap spring

2.2.1 Yarn defect shape

When the top roller is in contact with the cradle, the control spring in the cradle device locks the top roller to keep the top roller elastic and stable during operation. After the upper pin spring is broken, the fiber movement in the drafting zone is unstable, causing serious uneven yarn defects, and the CVb between the tubes is significantly increased. Table 2 is the quality comparison of C14.6 tex upper pin spring broken yarn and normal yarn

2.2.2 Mechanism analysis

Spinning cradle is one of the key components of yarn formation, and it is also the point of force application of the parallel force of the upper roller gauge and the lower roller gauge. After the upper roller snap spring breaks, the position of the upper roller loses control and is affected by motion vibration. The indefinite forward or backward movement of the center distance causes fluctuations in the running process and instability of the fiber movement, which in turn affects the difference in yarn sliver.

2.2.3 Causes and prevention of yarn defects

Reasons for formation:

(1) Incorrect disassembly method, twist and tear when removing the top roller;

(2) Excessive pressure on the cradle;

(3) The circlip is deformed and the assembly position is not correct, so that the upper roller shaft and the circlip shaft are strongly compressed.

Prevention method:

(1) Adopt the correct disassembly and assembly method, release the pressure against the elastic point of the circlip by hand, and take off the top roller naturally, instead of using the method of rigid pulling and twisting;

(2) When the spring is used to adjust the pressure of the cradle, use a standard positioning gauge to adjust, to avoid non-standard trial adjustment based on experience;

(3) Master the correct assembly method when assembling to prevent the circlip from being crushed.

2.3 Spinning machine 6 ～ 8cm slub yarn defect

2.3.1 Yarn defect shape

Spinning process 6 ～ 8 cm slub yarn defect is generally considered to be a yarn defect caused by a roving package joint or a spun yarn joint, but it is found in production that it is actually a yarn defect caused by machinery and blowing air, and its shape is continuous 4 ～ 5 A slubby yarn defect, up to 40 cm long, with strong continuity and irregularity, with a fiber core in the yarn defect, hairy outer ends, and a small twist, which seriously affects the production efficiency of the winding.

2.3.2 Mechanism analysis

Mechanical reason: The roller gear drive wears and loosens the keyway, leading to a lag phenomenon during the transmission process, which causes the fiber aggregation in the roller drafting motion to form a stubby yarn defect; blowing suction cleaner Reason: blowing the suction nozzle in the middle The twisting area causes a weak loop in the twisting area. The direct airflow affects the twisting of the yarn body, and the fibers are exposed outside the body to form a thick yarn defect.

2.3.3 Causes and prevention

Mechanical reasons:

(1) The machine is in disrepair, and the standard of flat wipers is not high, and the requirements are not strict. Causing keyway wear;

(2) The bearing is damaged and the gear mesh is too large, causing abnormal wear;

(3) The adjustment position of the suction cleaner is not correct, and it is not adjusted according to the regulations when replacing.

Prevention method:

(1) Strengthen mechanical maintenance to ensure that the meshing amount of gears meets the standards;

(2) Flatly push the car to timely repair the keyway and key nails; correctly adjust the installation and twisting area blowing and suction position.

2.4 Hairline yarn defects caused by hanging travellers

2.4.1 Yarn defect shape

Hairiness is one of the important yarn defects that affect the quality assessment. It is generally produced in the drafting and twisting triangle area. In actual production, the hairiness caused by the hanging of the traveler not only affects the quality, but also is not easy to find during the inspection. Specific form: hairy hair is concentrated and dense, hairy appearance, the binding layer of the winding layer in the bobbin is unclear, the hairiness index of l-9 mm is increased to different degrees.

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