What is SMS non-woven fabric

What is SMS non-woven fabric

SMS (English: Spunbond + Meltblown + Spunbond Nonwovens)

It is a composite non-woven fabric, which is a composite product of spunbond and meltblown

Collapse edit this paragraph performance
It is non-toxic, tasteless and highly effective in separating bacteria. Through special treatment of equipment, it can achieve antistatic, anti-alcohol, anti-plasma, water repellent and water production performance.

Features of non-woven fabrics: Durability, disposable. Insulating and non-conductive. Softness and stiffness. Density and expansion. Isotropic, anisotropic. Filterability, breathable and impermeable. Elasticity and stiffness. Light, loose and warm. Thin as a cicada’s wings, thick as felt. Waterproof and breathable. Ironing, stitching, and compression molding. Flame retardant and antistatic. Water-permeable, waterproof, abrasion-resistant, and flocking. Wrinkle resistant, good elasticity, high moisture absorption, water repellency.

1. Lightweight: Polypropylene resin is used as the main raw material for production. The specific gravity is only 0.9, only three-fifths of cotton. It is fluffy and feels good.

2. Softness: It is composed of fine fibers (2-3D) and is formed by light-point hot-melt bonding. The finished product is moderately soft and comfortable.

3. Water-repellent and breathable: Polypropylene slices do not absorb water, have zero water content, and have good water-repellent properties. They are made of 100% fiber and are porous and air-permeable. It is easy to keep the cloth dry and easy to wash.

4. Non-toxic and non-irritating: The product is produced with FDA food-grade raw materials, does not contain other chemical components, has stable performance, is non-toxic, non-odor, and does not irritate the skin.

5. Antibacterial and anti-chemical agents: Polypropylene is a chemically blunt substance, not moth-eaten, and can isolate the corrosion of bacteria and insects in the liquid; antibacterial, alkali corrosion, and the strength of the finished product will not be affected by erosion.

6. Antibacterial property. The product is water-repellent, does not mold, and can isolate the erosion of bacteria and insects in the liquid, and is not moldy.

7. Good physical properties. It is made of polypropylene spun yarn directly spread into a net and thermally bonded. The product strength is better than ordinary staple fiber products, the strength is non-directional, and the vertical and horizontal strengths are similar.

Collapse edit the purpose of this paragraph
(1) Medical and health cloths: surgical gowns, protective clothing, disinfection wraps, masks, diapers, women’s sanitary napkins, etc.;

(2) Home decoration cloth: wall cloth, table cloth, bed sheet, bedspread, etc.;

(3) Follow-up cloth: lining, adhesive lining, flakes, shaped cotton, various synthetic leather base cloths, etc.;

(4) Industrial cloth: filter material, insulating material, cement packaging bag, geotextile, covering cloth, etc.;

(5) Agricultural cloth: crop protection cloth, seedling raising cloth, irrigation cloth, thermal insulation curtain, etc.;

(6) Environmental protection materials: sanitation products such as filter non-woven fabrics, oil-absorbing cloths, etc.

(7) Insulation cloth: insulation materials and clothing accessories

(8) Anti-feather non-woven fabric for anti-feather running

(9) Others: space cotton, thermal insulation materials, etc.

Collapse edit this paragraph industry standards
Scope

This standard specifies the product classification, technical requirements, test methods, acceptance rules, packaging and marking requirements, transportation and storage of polypropylene spunbond/meltblown/spunbond composite non-woven fabrics (hereinafter referred to as SMS).

This standard applies to polypropylene SMS products with 10g/m2->80g/m2 polypropylene as the main raw material

Normative references

The clauses in the following documents become clauses of this standard after being quoted in this standard. For dated reference documents, all subsequent amendments (excluding errata content) or revisions do not apply to this standard. However, all parties that have reached an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used . For undated reference documents, the latest version is applicable to this standard.

GB/T 4744 Determination of the impermeability of textile fabrics, hydrostatic pressure test

GB/T 5453 Textiles, determination of fabric breathability

GB/T 6529 Standard atmosphere for humidity control and testing of textiles

FZ/T 60003 Non-woven fabrics per unit area quality determination

FZ/T 64004 Thin bonding non-woven fabric

Determination of breaking strength and breaking elongation of FZ/T 60005 non-woven fabric

Noun term

The terms established in GB/T3291.3 and the following are applicable to this standard

3.1 Hard block

Refers to lumps caused by melt dripping.

3.2 Stiff wire

Refers to the undrafted hard wire.

3.3 Turn over the net

It refers to the phenomenon that the fiber web is severely uneven due to the hanging of foreign objects before the product is not reinforced.

3.4 Folding

It refers to the superposition phenomenon of the fiber webs being superimposed together, and after being reinforced, it is different from other places.

3.5 Hole

Holes with an area of ​​4mm2 or more, without fibers in the middle are holes.

skills requirement

4.1 Polypropylene chips (whether raw materials are required)

4.2 Physical properties

The physical properties of the product should meet the requirements of Table 1

Table 1 Physical performance requirements

Mass per unit area g/m2 11-13 >13-17 >17-21 >21-25 >25-30 >30-35 >35-40 >40-50 >50-60 >60-70 >70-80> 80

Mass deviation rate per unit area:% ≤±6%, ≤±4%,

Deviation of single value per unit area% ≤±12%

Longitudinal breaking strength N/5cm >18 >23 >28 >35 >40 >50 >54 >67 >81 >90 >100 >108

Longitudinal elongation at break% >30 >30 >30 >30 >30 >30 >30 >30 >30 >30 >30 >30

Transverse breaking strength N/5cm >9 >11 >14 >18 >22 >28 >32 >38 >45 >55 >60 >65

Transverse elongation at break% >30 >30 >30 >30 >30 >30 >30 >30 >30 >30 >30 >30

Resistance to hydrostatic pressure mmH2O >80 >110 >130 >150 >200 >220 >250 >280 >300 >300 >300 >300

Air permeability l/m2/s >1100 >900 >800 >700 >600 >400 >250 >200 >150 >125 >125 >100

Note: For SMS products with a horizontally spread spunbond layer, the breaking strength and elongation indicators shall be implemented in accordance with the contract or agreement between the supplier and the demander.

4.3 Appearance quality

4.3.1 The cloth surface is uniform, smooth, without obvious creases, broken edges, holes, oil stains, and neatly packaged.

4.3.2 The width is in accordance with the contract and agreement. The width deviation is specified in Table 2.

Table 2

Width (mm) Width deviation (mm)

≤800 ±3

>800 -2-+5

4.3.3 Pollution: The product should be dry, clean, free of oil, insect, dust, metal powder and other pollution.

4.3.4 Hard blocks/stiff wires: no more than 10 pieces per 1000 meters, each area does not exceed 4cm2, and continuous hard blocks/stiff wires are not allowed.

4.3.5 Micro-holes: Refers to the pinhole-sized holes on the surface of the product. For sanitary and medical products, micro-holes are not allowed.

4.3.6 Odor: No abnormal smell is allowed.

4.3.7 Hole/tear/cut: No hole/tear/cut is allowed

4.3.8 Turning net/folding: no more than 10 per kilometer for the width of less than 5cm; no more than 1 per kilometer for the width of more than 5cm.

4.3.9 Wrinkles: Continuous dead wrinkles are not allowed.

4.4.10 Unreinforced area: It is not allowed to have more than 5 connected pressure point defects.

4.4.11 The appearance of the cloth roll: It should be clean, neat, without rotten edges and visible defects.

4.4.12 Joints: For diapers/sheets and women’s sanitary napkins, the number of joints per cloth roll is not allowed to exceed 1 per 1000 meters.

experiment method

5.1 Appearance inspection

Under sufficient light, use normal sensory inspection and measure with a straightedge or steel ruler with an accuracy of 1mm.

5.2. Physical performance inspection

5.2.1 The measurement of mass per unit area shall be in accordance with FZ/T 60003-1991.

5.2.2 The determination of breaking strength and elongation shall be in accordance with FZ/T 60005-1991.

5.2.3 The measurement of anti-hydrostatic pressure shall be in accordance with GB/T 4744-1997.

5.2.4 The air permeability is measured according to GB/T 5453-1997, a 20cm2 test head is selected, a pressure difference of 100Pa is set, and the unit of measurement is l/m2/s.

5.2.5 Select one of the following methods to determine the width according to the contract or agreement.

5.2.5.1 Measure the width of the roll with a steel tape measure to be the width of the changed roll, accurate to 1mm,

5.2.5.2 Unwinding to relax the fabric, at least 5m away from the winding head, measure the width of at least 5 places with a rigid tape, accurate to 1mm. Calculate the average value (reserving integer digits) and use it as the width of the rewinding.

testing regulations

6.1 Inspection items

The square meter quality, strength, elongation, hydrostatic pressure, air permeability and width in the technical requirements are the factory inspection items. Products should be inspected by the inspection department of the manufacturer and accompanied by a product certificate before leaving the factory.

6.2 Batch regulations

Each batch of products must be a continuous production product with the same raw material ratio, process conditions and specifications.

6.3 Sampling regulations

For each batch of products, according to the provisions of FZ/T64004-93 in 7.3, the sample length 3m for physical properties is taken and the direction is calibrated, and the sampling date, production team and product specifications are recorded.

6.4 Evaluation of inspection results

The lowest level of the assessment items in the technical requirements is determined as the level of the batch of products. The physical and mechanical properties are determined by the batch, and the appearance

The quality is graded according to the paper. If the physical and mechanical performance test results do not meet the requirements, the sample samples can be doubled and the project will be retested.

The final result of the retest is the basis for judgment.

6.5 Acceptance rules

6.5.1 According to the quality inspection by the manufacturer, within 1 month of delivery, the receiver shall carry out acceptance inspection.

6.5.2 At the time of acceptance, the physical and mechanical performance test shall randomly sample samples from the batch at 10% of the delivery volume, and shall not be less than 2 rolls. Each roll shall be tested in accordance with the provisions of Chapter 6, and the average value of each roll shall be taken as Final result. Appearance inspection will be re-inspected at 20% of the delivery volume from the batch of products, not less than 5 rolls, under 400-600LX illumination, roll-to-roll inspection, if the non-conforming product rate exceeds 8%, then This batch of products is reduced by one grade accordingly.

6.5.3 If there is any objection to the quality of the product, it may be submitted to the arbitration inspection agency for re-inspection, and the re-inspection result shall be the final result, and the responsible party shall bear the cost of the re-inspection.

Packaging, marking, transportation and storage

7.1 Packaging

The packaging material uses plastic film or shrink film.

7.2 Label

The label should be filled in clearly and neatly, and the content should include: manufacturer name, product name, executive standard number, label registration number, production batch number, product specifications (square meter weight, width, roll length, color, etc.), theoretical roll weight , Volume number, quality grade mark; label color can be determined according to needs.

7.3 Transportation

It should be protected from light, waterproof, moisture, pollution, breakage, and extrusion, and it is strictly forbidden to drop the cloth roll from a high place.

7.4 Storage

Store in a ventilated, dry, dark and clean warehouse.

Special treatment for this paragraph
Various special treatments are carried out on non-woven fabrics to meet customer requirements for various special properties of non-woven fabrics. The treated non-woven fabric has anti-alcohol, anti-blood, and oil-resistant functions, and is mainly used in medical surgical gowns and surgical drapes.

Anti-static treatment: Anti-static non-woven fabrics are mainly used as materials for protective equipment that have special environmental requirements for static electricity.

Absorbent treatment: Absorbent non-woven fabrics are mainly used in the production of medical consumables, such as surgical drapes, surgical pads, etc.

Flame-retardant treatment: Flame-retardant non-woven fabrics are widely used in furniture products and aviation products.

Antibacterial deodorization and photocatalyst effect treatment: This type of non-woven fabric is mainly used in the field of household products.

Anti-ultraviolet treatment: Anti-ultraviolet, anti-aging non-woven fabrics are mainly used in agricultural covering fabrics, car covers and other fabrics where sun protection and anti-aging effects are required.

Fragrance treatment: Fragrance non-woven fabrics are used in sanitary products (mint, lemon, lavender, etc.).