Summary: It is a new type of fabric made of one or more layers of textile materials laminated by oil glue or hot melt glue.
Six internationally popular composite fabric techniques
1. Hot sol powder dot coating composite fabric technology
2. Hot sol pulp dot composite fabric technology ★PUR
3. Hot-sol powdered composite fabric technology
4. Hot-sol two-point composite fabric technology
5. Polyurethane Spraying composite fabric technology
6. Polyurethane roller coating composite fabric technology★that is, PU
Divided according to the number of layers:
Three layers: compound with film (called three-in-one compound on the market);
Two layers: compound without film
The core components of composite equipment are the gluing device and the composite device. When the surface cloth (film) passes through the gluing device, it is squeezed by the gluing pressure roller. The glue in the glue eyes of the engraving roller is forced to transfer to the surface cloth (film), and then is pressed by the composite device to obtain the initial bonding. Fastness.
The gluing device
is an engraving roller With a rubberized silicone pressure roller.
There are two general point shapes of engraving rollers: diamond points and round points.
The diamond-shaped points are arranged regularly, the points are consistent, and the water pressure resistance is relatively good. There are two types of circular dots: regular arrangement and irregular arrangement. The dot spacing is inconsistent and the water pressure resistance is relatively weak.
The time of maintenance treatment affects the fastness of fabric bonding and the adhesive The degree of fusion is greatly affected. The maintenance and treatment workshop is fully enclosed and a certain temperature and humidity are maintained indoors to allow the adhesive to fuse naturally. If the temperature is increased for quick completion, the yarn will be easily needle-shaped during the sewing process of the fabric. When pierced, the feel becomes hard, and there will be a rustling sound when rubbing against each other, indicating that the adhesive has solidified on the fabric and hardened the yarn of the fabric.
PU process equipment
In traditional compounding equipment, the original glue is heated and dissolved in the solvent, the glue solution is added to the glue application tank manually, and the solvent is evaporated by hot pressure in the compounding wheel.
The maturation conditions of the glue solution are 30℃×5day, so that the solvent can evaporate to the maximum extent.
Advantages and disadvantages of PU technology:
1. Low cost, flexible and convenient operation
1. The solvent is pungent and not environmentally friendly, and is easy to produce APEO and formaldehyde
2. When applied manually, impurities are easily mixed in, and the amount of glue applied to the glue dots is unstable
3. If more glue is applied, the feel will be harder.
4. Ready-made garments cannot be dry cleaned
★This process has many problems. If it is not a chemical fiber fabric, it is recommended not to use this process
PUR process equipment
Use 100% solid content single-component reactive hot melt adhesive, which does not contain chemical solvents, is environmentally friendly and has no irritating smell. The machine automatically applies it and the glue tank is heated.
The maturation conditions of hot melt adhesive are 30℃ room temperature, humidity >90%, and it must be left for 72 hours to achieve the final peeling effect.
Advantages and disadvantages of PUR process:
1. Environmentally friendly and no odor , formaldehyde-free
2. Reactive glue, the glue points are long-lasting and the garments can be dry-cleaned.
3. Less glue and soft feel
1. The quality of glue is very important
2. The amount of glue applied is small and if the maintenance is insufficient, the peeling strength will be poor
Frequently asked questions about composite fabrics
1. Fabric color
1. The lamination process, gluing, hot pressing, drying and other processes have an impact on the color of the fabric.
2. If the top fabric is light-colored and the base fabric is dark, the color of the base fabric will have a greater impact on the color of the base fabric.
2. Washing and stripping/foaming
Fabric composite Later, due to poor bonding fastness, partial detachment or blistering occurred during washing.
3. Fold and wrinkle
Non-elastic thin fabric for surface When the base fabric is knitted thicker, it is easy to fold and wrinkle.
4. Washed treeSkin wrinkles
The shrinkage difference between the top fabric and the bottom fabric is more than 3 points and the fabric thickness difference is large. When the composite fabric is washed, bark will form on the thin fabric surface due to the shrinkage difference. wrinkle effect.
5. Translucent shuttle
The fabric should be light-colored and thin. After the glue is matured, glue spots can be seen on the cloth surface.
6. Glue overflow
For fabrics with sparse tissue and a hard feel, it is easy for glue to seep out of the fabric surface.
7. The color yarn of light-colored fabrics is highlighted due to compounding
White fabrics, especially white woolen fabrics, after lamination, due to the background of the base fabric, fabric defects such as colored yarns in the white fabrics are particularly prominent.
8. Composite entrained foreign matter
During the PU composite production process, it is easy for impurities (such as hair, fiber scraps, etc.) to fly into the composite glue, and the foreign matter entrained when composite light-colored fabrics will appear on the cloth surface.
Elasticity The fabric and the non-elastic fabric fit together and the thickness of the elastic fabric is thicker than the non-elastic fabric. During the composite production process, if the surface tension of the fabric is not well controlled, it will easily curl.
Summary and measures
Selection of top and bottom fabrics
Best: consistent door width, consistent shrinkage, consistent thickness
1. The difference in shrinkage is more than 3 points, and the fabric with smaller shrinkage should be selected than the one with the same thickness. The fabric with the highest rate is thicker (determined by the specific sample).
2. The fabric before lamination should not be subjected to hydrophobic softening treatment, especially fluorine-containing waterproofing treatment.
3. Try to avoid choosing white fabrics, especially white woolen materials, for lamination.
4. High-value fabrics are better than low-value fabrics. The fabric door width is narrow, and the difference in door width cannot exceed 10CM, otherwise the waste will be large.
5. Try not to use fabrics with production risks for lamination.
1. For fabrics that require dry cleaning, the PUR process should be selected for lamination.
2. When laminating, the fabrics should be aligned with the silk strands to avoid weft skew, straight yarn twisting, etc.
3. Mid-term maintenance treatment It must be sufficient, otherwise the peeling strength will be poor.
4. Composite processing seems simple, but it has a lot to do with the experience, technology, and operational proficiency of the composite factory.
5. The composite fabric cannot be recombined. Even if it is peeled off, it will affect the yarn of the fabric, make it hard to the touch, and the yarn is easily punctured by needles.
6. Non-elastic high-density woven fabrics need to be compounded with film, otherwise the fastness will be poor
Composite order process
1. Composite production must go through evaluation-sample-testing before confirmation
2. The pre-cut fabric composite for bulk goods must be evaluated by a fabric sample before it can be determined
3. The national standard for composite fabrics is only FZ/T 72016-2012 “Knitted Composite Clothing Fabrics”, which is applicable to clothing fabrics processed by bonding composite processes between knitted fabrics and other materials.
4. It is required that it does not come off after being washed 5 times, does not foam, and the peeling strength is qualified</p