1 Introduction
Stenter setting in dyeing and finishing production process is the finishing of woolen fabric
An important part of the process, the defect pre-control in the production process directly affects the after-work
The fabric quality of the order and the relevant physical property requirements of the customer. daily production
In the management process, adopt mature defect control measures, combined with pull
Meticulous inspection and maintenance of the width setting equipment, coupled with correct, serious and flexible operation
operation, paying attention to the influence of subtle factors on the formation of operational defects, and will eventually
Control of product defects caused by stenter setting process in dyeing and finishing process
Appropriate, can achieve the overall improvement of product quality indicators and production efficiency
The purpose is to meet customers’ increasingly higher requirements for product quality.
Stenter setting machine
2 Structure and function of REHOW stenter setting equipment
2.1 Structure of stenter setting equipment
The stenter setting equipment consists of a cloth feeding frame, a three-roll or two-roll rolling machine, and a
Needle wheel weft adjusting device-overfeeding device-chain-oven-cloth outlet
It is composed of a left and right frame, and its working principle is to use a heating device to turn the air
Air heating, with the help of a blower and a hot air circulation system to dry the billet [1].
2.2 The role of stenter setting equipment
Stenter setting is a transition process from wet billet finishing to dry billet finishing
Sequence, the main function is to pull out the process width according to the process requirements, generally
The error is required to be within ± 2 cm; the moisture regain of the gray cloth is controlled to the process requirements.
Generally, it is 8%~12%, which is convenient for storage and transportation [2]; usually
Overfeed device to reduce fabric elongation during wet finishing,
Adjust the warp and weft density, stabilize the gram weight, and achieve a certain stereotype
High temperature heat setting with , especially wool and polyester varieties, so that the product
Meet the specification requirements of semi-finished products.
3 Causes of defects in stenter setting and preventive measures
3.1 Causes of spot oil spots and preventive measures
Causes: the trough or pressure roller, the cloth passing channel is not clean, dripping
The protection of the oil part is not in place. Pre-control measures: equipment rolling and cloth passing
Poor oil seal of rollers causes hidden dangers of dripping and oil leakage, daily maintenance through weekly maintenance
Check and overhaul the oil leaking parts; due to high setting temperature,
The oil in the daily chain and bearing sublimates to the top of the inner layer of the oven for a long time
Irregular oil dripping occurs in the long-term accumulation, and it should be implemented in daily maintenance
Clean and wipe; the air duct of the circulating air cooler is dripping oil due to the accumulation of oil hair
Contamination, focus on cleaning and wiping in daily maintenance.
3.2 The causes and preventive measures of needle drop and hanging wide needle
Causes: the self-control electric eye is not sensitive, the brush and the needle plate are not
Good, improper operation, unsuitable overfeeding, poor condition of the billet,
Too narrow (pseudocontracted breeds). Pre-control measures: during daily equipment maintenance
Focus on checking problems such as missing needle boards and broken needles, and update them in time.
Change it to prevent incomplete hanging stitches on the cloth surface and avoid the lotus leaves
side; during daily production, check the slack state of the pressing needle timing belt in time
And problems such as broken edges, to prevent the phenomenon of hanging wide needles and needles.
3.3 Causes of inconsistencies in width and preventive measures
Cause: The wrong width is pulled, and the equipment screw is abnormal and cannot pull the width
Wide, the billet has great elasticity, the billet shrinks greatly when it is wet, and the speed of the car is inconsistent.
Pre-control measures: In the daily maintenance equipment, the inner and outer wires of the oven should be well prepared.
For the daily maintenance of the screw, add the screw smoothing agent frequently, and remove the entanglement in time.
Lines and foreign objects; the width must be adjusted in advance before the equipment is driven, and the daily maintenance
Do a good job of adjusting the difference between the internal and external width and the set width;
Good fan motor maintenance and air outlet blockage cleaning work, play
Make a good cooling effect of the cloth fan; do a good job in the filter of the circulating fan
Daily cleaning work, and regularly detect the temperature deviation between the side and the middle,
Check and maintain the electric heating system and steam heating regulating valve at any time.
3 . 4 Causes and preventive measures of cloth scraping
Cause: The needle-off device at the cloth exit is defective, and the needle-off of the weft adjustment machine
The tension is too large, the three-finger tear has not been dealt with properly, the cloth strength is too small,
The left and right rollers do not work, the rollers are entangled, the corners of the wheels break the hanging cloth, and the spiral expands
Width roller hanging cloth (false shrinkage cloth deviation). Pre-control measures: regular inspection and pull
The angle of the copper strips and the operation of each cloth roller are sensitive
degree, do a good job of adjusting the width of the cloth, and prevent the cloth from being improperly fixed.
The occurrence of cloth scraping problems; do a good job of wrapping the cloth spreading roller and the cloth passing roller on a regular basis
Overhaul and maintenance of wires and bearings to prevent electric eye failure and wire entanglement
The problem of deviation caused by scraping cloth.
3.5 Causes and preventive measures of edge scratches
Cause: There are broken needles or bent needles on the needle plate and needle wheel, and the crochet needles are now
Like , the hanging stitch is too wide. Pre-control measures: implement the weft adjustment before each shift
Inspection of the full tooth degree, bending and fracture of the needle plate in the machine and the chain
Check, and replace defective or shortage ones in time to avoid bent needles and broken needles.
needles, lack of needle plate and other reasons cause the problem of needle drop and scratches; every
Do a good job in the maintenance and maintenance of chains, needle plate clamps and needle plates during the second inspection to ensure that
Verify its integrity and cleanliness.
4 REHOW, production requirements for stenter setting and essentials for equipment maintenance
4.1 Production requirements
The general temperature of high temperature setting is controlled between 165°C ~ 185°C
between, the vehicle speed is controlled at 20~38 m/min, once the equipment fails and
The insensitive operation of the equipment will directly cause the cloth to turn yellow or be scrapped.
serious economic losses, and even lead to production accidents, therefore, keep
The good operation status of the stenter setting equipment is particularly important [1].
4.2 Maintenance operation essentials
4 . 2 . 1 In principle, the heat setting is arranged in the long day shift time.
The machine time must be tracked by a special person, and the overhaul of the equipment should be checked in advance.
Integrity and sensitivity of the road, needle plate and cloth roller, if necessary, there must be a work
On-site guidance by artists, including trial production, mass production of the first car, disembarkation
After the first time to keep the sample, and make a comparison between the side and the middle color difference sample,
Pay attention to the color difference between horses and horses, especially for sensitive varieties.
4.2.2 Do a good job of electric heating or steam heating of the equipment heating system
Check the control valve and check the temperature of the inner side and the middle of the oven to ensure
The actual set upper and lower layer temperatures meet the process requirements; single box drying
• 20 •
Set at 165°C, open a group of additional steam heating and all electric heating
(except special requirements)[1].
4 . 2 . 3 Implement the distribution fan circulation system and the operation sensitivity inspection
Check to ensure that the air volume is set according to the process requirements without abnormal cooling.
4 . 2 . 4 Do a comprehensive inspection of the equipment in advance and communicate with the operator
After the temperature rises to the standard temperature, run for 10 minutes until the temperature reaches the
After reaching the saturation temperature, proceed to machine setting.
4 . 2 . 5 Width must strictly implement the process width, if there is thermal
The width of the molding process is smaller than the width before finalizing the shape, so it is not allowed to go on the machine, and it must be done in time
Please ask the person in charge of the third shift, craftsmen and other relevant personnel, and it is true that due to the needs of the craft,
If necessary, it shall be signed and approved by the craftsman, and after the workshop director signs and agrees,
The person in charge of the third shift, craftsman, squad leader, and quality inspector are all present before they can
Start production.
4. 2. 6 Adjust the weft in time according to the skew of the seam head during heat setting
Slant, the weft inclination of the lower machine is controlled within 3 cm, daily maintenance workers must
Do a good job in the balance and sensitivity of the straight rollers, curved rollers, and pin wheels in the weft trimming machine.
Check the degree to ensure that the equipment corrects the weft skew and arc skew to meet the predetermined requirements.
beg .
4 . 2 . 7 In case of sudden stop in case of an accident during stenter setting,
The operator of the vehicle should immediately open the closed door of the equipment to dissipate heat, and take corresponding measures.
Response measures, drive slowly, check the faults in time, and eliminate the faults
Point , to reduce the quality loss caused by high temperature parking.
4 . 2 . 8 If the equipment is not in good condition, it is strictly forbidden to drive the stenter to finalize the shape.
If there is an abnormality during operation, stop the cloth immediately and stop the stenter.
model, and report the problems of the equipment to the security workers in time.
4 . 2 . 9 The cloth before stenter setting must be neat, and the seam must conform to
In line with the requirements of the process, it should be flat, straight and even, especially the two ends should be sewn together, so as to
Anti-needle stop when the machine is over the whole weft or when the needle is hung up, the oven
The filter inside should be cleaned in time.
4 . 2 . 1 0 When the stenter is finalized, it is necessary to patrol frequently and observe the various processes in time
Changes in parameters, especially temperature and overfeed, the cloth surface must always be kept
There is a slight fold in the radial direction, and there is proper tension in the tabular direction, and it should not sag. heat set
The molding time should be controlled within 2 hours, if there are more cloths, it can stop
After the car cools down for 20 minutes, it will be finalized according to the requirements. It is strictly forbidden to exceed 2
Hours, in case the setting time is too long and the temperature is too high
Yellowing of the cloth color and safety accidents.
5 Conclusion
Through the implementation of the above production measures, the stenter setting work can be made
The defects of the sequence are reduced by 20%, and the production efficiency is increased by about 15%.
Finally, the quality and performance of the products meet the requirements of customers to provide production
Guarantees have laid a more solid foundation for improving the economic benefits of enterprises.
Post time: May-15-2023
