Analysis of quality problems of composite fabrics

Composite fabric

A new type of material made of one or more layers of textile materials laminated by oil glue or hot melt glue.

International popular 6 kinds of composite fabric process:

1, hot melt glue powder point coating composite fabric process

2、Heat-soluble glue paste point composite fabric process★that is, PUR

3、Heat-soluble glue powder composite fabric technology

4、Heat-soluble glue double point composite fabric technology

5, polyurethane spraying composite fabric technology

6, polyurethane roll coating composite fabric technology ★ that is PU

Divided according to the number of layers.

        Three layers: plus film composite; two layers: no film composite

Production principle

The core components of compounding equipment are gluing device and compounding device

When the surface fabric (film) passes through the gluing device, the glue in the eye of the engraving roller is forced to transfer to the surface fabric (film) through the squeezing of the gluing roller, and then the initial bonding fastness is obtained through the pressing of the laminating device.

Production flow

Gluing device.

An engraving roller with a gluing silicone press roller.

Engraving rollers generally have two types of dot shapes: diamond-shaped dots and round dots.

The diamond-shaped point arrangement is regular, the point is consistent, and the water pressure resistance is relatively good. There are two kinds of round dots: regular and irregular, with inconsistent point distance and relatively weak water pressure resistance.

Maintenance treatment

The time of maintenance treatment has a great influence on the fastness of fabric bonding and the degree of adhesive fusion. The maintenance treatment workshop is fully enclosed and the temperature and humidity are kept in the room to allow the natural fusion of adhesives. become hard.

PU process equipment.

Traditional compounding equipment, the original glue is heated and dissolved in the solvent, manually added to the glue application tank, after compounding the big wheel hot press evaporate solvent.

Glue maturation conditions for 30 ℃ × 5day, so that the solvent can maximize volatilization.

PU process advantages and disadvantages.

Advantages.

     1, low cost, flexible and convenient operation

Disadvantages.

      1, solvent pungent, not environmentally friendly, easy to produce APEO and formaldehyde

      2, hand-applied easy to mix with impurities, the amount of glue with the glue is not stable

      3, the amount of glue applied more, the feel is hard.

      4、The garment can not be dry-cleaned

★ This process has more problems, if not chemical fiber fabrics recommended not to use this process

PUR process equipment.

The use of solid content 100% single-component reactive hot melt adhesive, no chemical solvents, environmental protection, no irritating odor, automatic application of the machine, glue tank heating.

Hot melt adhesive maturation conditions for 30 ℃ room temperature, humidity ﹥ 90%, placed 72 hours to achieve the final peeling effect.

PUR process advantages and disadvantages.

Advantages.

     1、Environmental protection, no odor, no formaldehyde

     2, reactive glue, glue point lasting, garments can be dry-cleaned.

     3, the amount of glue is less soft to the touch

Disadvantages.

      1, the quality of glue is very important

      2, the amount of glue is small, maintenance if not sufficient, poor peeling strength

Common problems of composite fabrics

1. Fabric color

1, the composite process of gluing, hot pressing, drying and other processes have an impact on the color of the fabric.

2, the surface fabric light color, the bottom cloth dark color, color superimposed on the bottom cloth color will have a greater impact on the color of the surface cloth.

2. Washing off / blistering

After the fabric is compounded, due to the poor fastness of the fit, when washed, the phenomenon of local unraveling or blistering.

3. Folding and wrinkling

Non-stretch thin fabric for the surface cloth, the bottom cloth knitting thicker, easy to occur fold out of the wrinkled phenomenon

4. Washing bark wrinkle

Surface and bottom cloth shrinkage difference is greater than 3 points and the fabric thickness difference between the composite fabric will produce due to shrinkage differences thin fabric surface formation bark wrinkle effect.

5. Rubber permeability

Woven fabric species light color system, fabric species thin, glue ripening after the surface of the fabric can be seen glue dots.

6. Overflow glue

The organization is sparse, the feel of the hard cloth, easy to happen glue seepage out of the cloth.

7. Light-colored fabric color yarn due to compound highlighting

White fabric, especially white tweed material, after compounding due to the backing of the base cloth leads to white fabric color yarn and other fabric defects are particularly prominent.

8. Composite entrapped foreign matter

PU compound production process compound glue easy to fly into the impurities (such as hair, fiber shavings and other impurities), compound light-colored fabrics when the entrapped foreign matter will appear on the surface of the cloth.

9. rolled edge

Elastic fabric and non-elastic fabric laminated and elastic fabric thickness than non-elastic fabric thick, in the composite production process, if the fabric tension control is not good is very easy to roll the edge phenomenon.

Summary and measures

❂ Face fabric and backing fabric selection.

Best: consistent width, consistent shrinkage, consistent thickness

1. The difference in shrinkage rate is greater than 3 points or more, the shrinkage rate of small fabric selection to be thicker than the shrinkage rate of the fabric (specific samples to determine).

2. Compound front material should not do hydrophobic soft treatment especially can not do the waterproof treatment containing fluorine.

3. Try to avoid choosing white fabric, especially white tweed to do composite

4. High-value fabrics should be narrower than low-value fabrics, and the difference in width should not be more than 10CM, otherwise the waste is larger.

5. There are production risks of the fabric try not to choose to do composite.

❂ Compounding process.

1. The fabric that the garment requires dry cleaning, compound to choose PUR process.

2. When compounding, the fabric should be aligned with the silk skein to avoid weft slanting, straight silk twisting, etc.

3. Medium-term maintenance treatment should be adequate, otherwise the peeling strength is poor.

4. Compound processing seems to be simple, but the experience, technology and operation proficiency of the compounding factory have a lot to do with it.

5. After compounding, the fabric cannot be compounded again, even if peeled, it will affect the fabric yarn, feel hard and yarn is easy to be pierced by needle.

6. Non-elastic high-density woven fabric needs to be compounded with film, otherwise the fastness is poor

❂ Compounding order process.

1. Compound production should be assessed - sample - test to confirm

2. First cut pieces of composite goods to change the fabric composite must be after a fabric sample evaluation to determine

3. Compound fabric national standard only FZ/T 72016-2012 "knitted composite taking fabric" applies to knitted fabric and other materials by bonding composite process of clothing with fabric.

4. Require 5 times of washing without stripping, no blistering, peel strength qualified