range

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 nonwovens (hereinafter referred to as SMS).

This standard applies to 10g/m2—>80g/m2 polypropylene SMS products based on polypropylene.

Normative reference

The terms in the following documents become the terms of this standard by reference to this standard. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents are available. . For undated references, the latest edition applies to this standard.

GB/T 4744 textile fabric water resistance test, hydrostatic test

GB/T 5453 textiles, fabric permeability determination

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

Determination of the mass per unit area of FZ/T 60003 nonwoven fabric

FZ/T 64004 thin bonding non-woven fabric

Determination of breaking strength and elongation at break of FZ/T 60005 nonwoven fabric

Terminology

The following terms established in GB/T3291.3 apply to this standard.

3.1 Hard block

It refers to the hard block caused by the dripping of the melt.

3.2 stiffening

Refers to the unstretched hard thread.

3.3 Turning the net

It refers to the phenomenon that the product is seriously uneven due to being hanged by foreign objects before being reinforced.

3.4 folding

It refers to the superposition of fiber webs together, and after consolidation, different superpositions with other places.

3.5 Holes

A hole having an area of 4 mm 2 or more, and a fiber-free one in the middle is a hole.

skills requirement

4.1 Polypropylene chips (required for raw materials)

4.2 Physical properties

The physical properties of the product shall comply with 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%,

Single value deviation 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

Anti-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 transversely laid webs, the breaking strength and elongation index are to be implemented in accordance with the contract or agreement between the supplier and the buyer.

4.3 Appearance quality

4.3.1 The cloth surface is even, flat, no obvious creases, broken edges and holes, oil stains, and the package is neat.

4.3.2 The width is as specified in 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 Contamination: The product should be dry, clean, free of oil, insects, dust and metal powder.

4.3.4 hard block / stiff wire: 1000 meters no more than 10, each area does not exceed 4cm2, and no continuous hard block / stiff wire is allowed.

4.3.5 Micropores: Refers to holes in the surface of the product that resemble the size of the pinhole. For products used for hygiene and medical purposes, micropores are not allowed.

4.3.6 Odour: No abnormal smell is allowed.

4.3.7 Hole/Tear/Cut: No holes/tears/cuts are allowed

4.3.8 Folding/folding: no more than 10 per kilometer less than 5cm wide; no more than one per kilometer wide than 5cm wide.

4.3.9 Wrinkles: Continuous wrinkles are not allowed.

4.4.10 Unreinforced area: More than 5 connected pressure point defects are not allowed.

4.4.11 Appearance of the cloth roll: It should be clean and tidy, without any bad edges and visible defects.

4.4.12 joints: diapers / sheets and sanitary napkins, the number of joints per cloth roll, no more than one per 1000 meters.

experiment method

5.1 Inspection of appearance

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

5.2. Physical property testing

5.2.1 The mass per unit area is determined in accordance with FZ/T 60003-1991.

5.2.2 Determination of breaking strength and elongation is specified in FZ/T 60005-1991.

5.2.3 Determination of antistatic hydrostatic pressure according to GB/T 4744-1997.

5.2.4 Determination of air permeability According to the provisions of GB/T 5453-1997, select 20cm2 test head, set the pressure difference of 100Pa, select the measurement unit of 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 the width of the roll, to the nearest 1 mm.

5.2.5.2 Unwinding The fabric is slackened, at least 5 inches wide with a tape measure, at least 5 mm from the roll head, to the nearest 1 mm. Calculate the average (retaining integer bits) as the width of the revolving volume.

testing regulations

6.1 Inspection project

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

6.2 Batch regulations

Each batch of products must be composed of the same ratio of raw materials, process conditions and specifications.

6.3 Sampling regulations

Each batch of products shall be cut according to 7.3 of FZ/T64004-93, and the sample for physical properties shall be 3m long and cut and calibrated from the head of the coil for more than 1m. Record the sampling date, production team and product specifications.

6.4 Assessment of test results

The lowest grade of the assessment item in the technical requirements is determined as the grade of the batch of products, and the physical and mechanical properties are determined in batches.

According to the volume evaluation, if the physical and mechanical performance test results do not meet the requirements, the sample may be doubled and the project may be retested.

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

6.5 Acceptance rules

6.5.1 According to the quality inspection, the manufacturer shall accept the acceptance within one month of delivery. If it is not accepted, it shall receive the goods according to the inspection result of the delivery party.

6.5.2 At the time of acceptance, the physical and mechanical performance test shall randomly take samples from the batch of products at 10% of the delivery quantity, not less than 2 rolls. Each roll shall be tested according to the provisions of Chapter 6, and the average value of each test shall be The final result. The visual inspection shall be re-inspected from the batch of products at 20% of the delivery quantity, not less than 5 rolls, and the roll-to-roll rewind test shall be carried out under the illumination of 400-600 LX. If the product rate exceeds 8%, then The batch of products is reduced by one level.

6.5.3 If there is any objection to the product quality, the arbitration inspection agency may be requested to conduct a re-inspection, and the re-inspection result shall be the final result, and the re-inspection expenses shall be borne by the responsible party.

Packaging, marking, transportation and storage

7.1 Packaging

The packaging material is made of plastic film or shrink film.

7.2 Label

The label should be clearly and tidy. The content should include: manufacturer name, product name, implementation standard number, standard record number, production batch number, product specifications (square meter weight, width, length and color, etc.), theoretical volume , volume number, quality level mark; label color can be determined according to needs.

7.3 Transportation

It should be protected from light, water, moisture, pollution, damage, and anti-squeezing. It is strictly forbidden to drop the cloth from a height.

7.4 Storage

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