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Causes of fabric wrinkles

Causes of fabric wrinkles

  • Categories:技术专栏
  • Time of issue:2021-05-19 10:11:55
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Causes of fabric wrinkles

Ⅰ. The relationship between fiber recovery and anti-wrinkle performance. Wrinkles can be considered to be caused by the bending and deformation of the fiber due to external force, which is completely restored after being relaxed. The recovery performance of the fiber from the bending state (ie, anti-wrinkle performance) has a certain corresponding relationship with its tensile performance. The higher the recovery of the fiber, the better the anti-wrinkle performance. The wrinkle resistance of the fabric can be approximated by the tensile properties of the fiber, that is, the wrinkle resistance is determined by the nature of the fiber.

 

 

2. The essence of fiber bending deformation (1) During the stretching process, different regions of the molecules in the fiber deform differently. The hydrogen bonds existing in the regions with high lateral order can jointly bear the action of external forces, and there is less chance of intermolecular movement, mainly due to elastic deformation. When the hydrogen bond in the low side order area is subjected to external force, it is along the direction of the external force and deformed by the external force successively. With different strengths, the bond breaks and the relative displacement of the basic structural units gradually occur, except In addition to ordinary elastic deformation, forced high elastic deformation or plastic deformation may also occur.

(2) In the process of forced high elastic deformation or plastic deformation, along with hydrogen bond breaking up, new hydrogen bonds are formed. After relaxation, unbroken bonds and intramolecular rotation have the effect of restoring the system to its original state, but it is affected by new hydrogen bonds. The blocking effect, in addition to part of the slow recovery, also leaves unrecoverable deformation (permanent deformation), which is the cause of wrinkles. Under normal circumstances, it can also be considered that wrinkles are caused by slow elastic deformation.

Therefore, to improve the elastic properties of the fiber, we should try to introduce covalent cross-linking into the cellulose macromolecule.

 

 

Ⅱ. Anti-wrinkle principle of resin finishing:

Regarding the mechanism of resin finishing, it is still difficult to make a complete explanation. It is generally believed that there are two effects. 1. Deposition theory: The initial shrinkage of a resin with multifunctional groups is very small particles that can diffuse into the amorphous area of the fiber. After resinization, it is deposited in the fiber and establishes hydrogen bonds with the fiber molecules to entangle the fiber molecules with each other. As a result, the relative movement of the molecular chain is restricted, and the deformation of the fabric is improved.

2. Cross-linking theory The resin and the hydroxyl groups in the two cellulose molecules form a covalent cross-link, which connects adjacent molecular chains with each other, reducing the deformation that cannot be recovered immediately due to the disassembly of the hydrogen bond, and making the fiber deform from the deformation. Resilience in improved.

3. Interpretation from the perspective of physics and chemistry. Cellulose fibers are mainly internal energy in the process of stretching and recovery. The more internal energy stored, the greater the elasticity.

 

 

Ⅲ. The relationship between the degree of cross-linking and the anti-wrinkle performance

1. Degree of cross-linking The greater the concentration of the cross-linking agent, the greater the degree of cross-linking, and the better the anti-wrinkle performance, but if the cross-linking is too large, the strength decreases too much.

2. Crosslinking distribution Covalent crosslinking can only be produced on the surface of the amorphous and crystalline regions. Dry cross-linking: The dry anti-wrinkle performance is better, but the wet anti-wrinkle performance is poor (the area with high side order makes the hydrogen bond broken up).

Wet cross-linking: Cross-linking occurs in the middle-order area, and the low-order-degree area is less cross-linked. After drying, the fiber is dry and the cross-linking in the middle-order-degree area is in a relaxed state, while the low-order The region lacks stable crosslinks.

solution:

[Use the way]
● Finishing agent K011 is mainly used for anti-wrinkle and anti-shrinkage of high-end fabrics, washable and wearable resin, need to add catalyst (magnesium chloride) when using, this product is resistant to chlorine washing and ultra-low formaldehyde.
[Group]
Chemical composition: modified dimethylol dihydroxy vinyl urea
[Sexuality]
Appearance: colorless to light yellow fluid liquid pH value: 3.0-6.0
Solubility: easy to dissolve in water
Stability: stable to electrolyte, anion and non-ion in working fluid
[Special]
● Environmental protection, in line with environmental protection standard 100 (less than 75ppm according to Japanese LAW112), low profile
Yellow highly reactive resin, washable and wearable.
● High washing resistance,
[Shall use]
1. The shrink-proof, wrinkle-proof, non-ironing or washable finishing formula of pure cotton and its blended fabrics:
This product: 30-50g/L, MgCl2・6H2O, 8-15g/L

Other additives

2. The durable calendering, embossing and pleating finishing formula of pure cotton clothing or home textile decorative fabric: This product: 40-60 g/L, MgCl2・6H2O, 10-18g/L other additives

3. Highly active low-formaldehyde cross-linking agent, the bath solution does not need to be acidic adjusted to be acidic, and the dosage should not exceed the recommended range to avoid damage to the strength of the fabric.

4. Catalysis and baking must be sufficient to obtain sufficient crosslinking.

Process: padding liquid rate: 60-90%.

Working fluid temperature: 20℃-25℃

Drying temperature: 110℃-130℃

Baking temperature: 4-5min treatment at 150℃ or one-time drying and baking process on the tenter:

The first zone is pre-baked at about 110℃

Drying in the second zone is about 130℃

After the third zone is baked 150-180℃

The total processing time is 40-70s

Remarks: In order to prevent the strength from being reduced, it is recommended to add our company's ACN fiber protective agent together to prevent the fabric from embrittlement.

[Storage and transportation]

● Packaging and storage: 50kg/125KG packaging, and can be stored in a dry environment at room temperature for more than a few years.

Contact details

Address: Building C, Fumao Industrial Park, No. 2456, Nansanhuan Road, Shengze Town, Wujiang, Jiangsu Province

Phone:86-0512-63556100

Fax:86-0512-63556200

Mailbox:Davis@yuefagroup.com

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