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MT/T 763-1997 English PDF

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MT/T 763-1997: Test Methods and Judgment Rules for the Physical and Mechanical Properties of Base Fabric for Coating Fabric on Fan Drum Used for Coal Mine

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
MT/T 763-1997	English	319	Add to Cart	3 days [Need to translate]	Test Methods and Judgment Rules for the Physical and Mechanical Properties of Base Fabric for Coating Fabric on Fan Drum Used for Coal Mine		MT/T 763-1997

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Basic data

Standard ID	MT/T 763-1997 (MT/T763-1997)
Description (Translated English)	Test Methods and Judgment Rules for the Physical and Mechanical Properties of Base Fabric for Coating Fabric on Fan Drum Used for Coal Mine
Sector / Industry	Coal Industry Standard (Recommended)
Classification of Chinese Standard	W04
Classification of International Standard	49.025.60
Word Count Estimation	9,941
Date of Issue	12/30/1997
Date of Implementation	6/1/1998
Quoted Standard	GB/T 4667-1995; GB/T 7689.1-1987; GB/T 7689.4-1989; GB/T 10111-1988
Summary	This standard specifies the Mine Hairdryer coated Buji Bu (hereinafter referred to as the coating Buji Bu) the physical and mechanical properties test methods and decision rules. This standard applies to a variety of fiber duct Buji Bu coating material. Such as glass fiber cloth, glass cross-woven cotton, chemical fiber cloth, synthetic cloth.

MT/T 7:

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Test Methods and Judgment Rules for the Physical and Mechanical Properties of Base Fabric for Coating Fabric on Fan Drum Used for Coal Mine People's Republic of China Coal Industry Standard Physical and mechanical properties of coal mine air duct coated cloth base cloth Test methods and judgment rules 1997-12-30 Approved.1998-06-01 Implementation Approved by the Ministry of Coal Industry of the People's Republic of China

1 Scope 1 2 Normative references 1 3 Requirement 1 4 Test method 1 5 Inspection Rule 2 6 Judgment Rule 2 Appendix A (standard appendix) Determination of warp, weft breaking strength and elongation at break of coated base fabrics3 Appendix B (standard appendix) Determination of warp and weft tearing force of coated fabric base cloth 4 Physical and mechanical properties of coal mine air duct coated cloth base cloth Test methods and judgment rules

1 Scope

This standard specifies the test methods and judgments for the physical and mechanical properties of duct-coated base cloth for coal mines (hereinafter referred to as coated base cloth) rule. This standard applies to the use of a variety of fiber materials made of air duct coated cloth base cloth. Such as glass fiber cloth, glass wool interwoven cloth, chemical fiber cloth, Synthetic fiber cloth and so on.

2 Reference standards

The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all Is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 4667-1995 Determination of width of woven fabrics GB/T 7689.1-87 Textile glass fiber woven fabrics-Determination of thickness GB/T 7689.4-89 Textile glass fiber woven fabrics, determination of width and length GB/T 10111-88 Random sampling method using random number dice

3 Requirements

3.1 Specifications of coated cloth base cloth 3.1.1 The thickness of the coated fabric base fabric shall be ≤ 0.50 mm. 3.1.2 The width of the coated fabric base fabric shall comply with the requirements in Table 1. Table 1 Width of coated cloth base cloth mm Number 1 2 3 Width 915 15-5 1320 15-5 1610 15-5 3.2 Physical and Mechanical Properties of Coated Fabric 3.2.1 Longitudinal breaking strength of coated fabric base cloth, first grade product should be ≥2200 N/50 mm, secondary product should be ≥1800 N/50 mm. 3.2.2 Weft breaking strength of coated fabric base fabric, first grade product should be ≥2200 N/50 mm, secondary product should be ≥1800 N/50 mm. 3.2.3 Warp tearing force of coated cloth base cloth, first grade product should be ≥300 N, secondary product should be ≥250 N. 3.2.4 Weft tearing force of coated base cloth, first grade product should be ≥300 N, secondary product should be ≥250 N. 3.2.5 The elongation at break of the base cloth of the coated fabric should be ≤10%. 3.2.6 The elongation at break in the weft direction of the coated base fabric shall be ≤10%.

4 Test method

4.1 Determination of thickness of coated fabric base fabric 7689.1. 4.2 Determination of width of coated fabric base fabric 4667 and GB/T 7689.4. 4.3 The determination of warp and weft breaking strength and elongation at break of coated base fabric shall be carried out in accordance with the provisions of Appendix A. 4.4 The measured warp and weft tearing force of coated fabric base fabric shall be determined in accordance with Appendix B.

5 Inspection rules

5.1 Factory inspection and type inspection 5.1.1 The factory inspection of coated fabrics shall be inspected batch by batch by the quality inspection department of the manufacturer according to the items specified in Table 2. Table 2 Factory inspection and type inspection of coated cloth Inspection item factory inspection type inspection 3.1.1 √ √ 3.1.2 √ √ 3.2.1 √ √ 3.2.2 √ √ 3.2.3-√ 3.2.4-√ 3.2.5-√ 3.2.6-√ Note. "√" means should be checked; "-" means not to check 5.1.2 The type inspection of coated cloth base cloth shall be inspected by the quality inspection department authorized by the state according to the items specified in Table 2. 5.1.3 Type inspection should be carried out in one of the following situations. a) Trial-type identification when new or old products are transferred to production. b) After formal production, if there are major changes in materials and processes, which may affect product performance; c) When production resumes after 1 year of production suspension; d) When the national product quality supervision department requests the type inspection. 5.2 Sampling method and grouping rules 5.2.1 A certain number of unit products of the same specification and the same production process are produced stably and continuously as a batch. When both the supplier and the buyer settle the inspection, Take the shipment batch as the inspection batch. 5.2.2 Physical and mechanical properties of coated base cloth (warp and weft tear strength, warp and weft tear force, warp and weft tear elongation) GB/T 10111 sampling method at a distance from the cloth end 5 Randomly selected outside m, the number of samples is 4 m2.

6 Decision rules

6.1 For the items that fail the inspection, double samples shall be taken from the same batch of products to retest the unqualified items. The item was judged unqualified. 6.2 The warp and weft tearing strength and warp and weft tearing force of the coated base fabric are judged to be unqualified if any of them fails. 6.3 If there are two unqualified items in other items, the batch of products is judged as unqualified.

Appendix A

(Standard appendix) Determination of warp and weft breaking strength and elongation of coated base fabric A1 Principle The specimen is stretched on a constant speed tensile machine at a certain pulling speed to the maximum tensile force measured during the fracture and the increase in specimen length Added value. A2 Equipment A2.1 The measurement range is 0 ~ 5 kN, constant speed tensile machine with accuracy of ± 1%. A2.2 The tensile machine shall have a speed regulating device and an elongation measuring device. A2.3 The center points of the upper and lower clamps of the tensile machine should be within the tensile axis. The samples should be in the same plane. The effective width of the gripper jaws should not be less than 60 mm, the clamping surface should be able to clamp the specimen without sliding, if necessary Clamps with lines, grooves, or corrugated surfaces can be used. The clamping surface can be lined with appropriate materials to avoid damaging the specimen. A3 Test conditions The temperature of the laboratory is 20 ± 2 ℃, relative humidity is (65 ± 5)%. When testing under non-standard conditions, the test site should be recorded Point temperature and relative humidity. A4 Sample and preparation A4.1 Sample according to GB/T 10111 standard random sample (5 from the cloth end) m)), the number of which is not less than 1 m2. A4.2 The sample should be processed so that the warp and weft yarns do not slip. The processing method depends on the material properties. Processing method of glass fiber cloth Can be evenly painted on one side of the sample (vertical and horizontal) with polyvinyl alcohol aqueous solution or 401 adhesive (diluted with ethyl acetate, ratio of 1. 1) (Brush to each), then leave at room temperature for 24 The test was performed after h. A4.3 After processing the sample, according to the arrangement of Figure A1, take 5 warp and weft samples respectively. The length of the specimen is parallel to The warp or weft of the fabric shall not have the same yarn in the length direction of the two samples. Figure A1 Sample arrangement A4.4 Specimen size of the sample. A4.4.1 The sample length is 280 mm, effective clamping length is.200 mm. A4.4.2 The effective width of the sample after removing the yarn is 50 mm. A5 Test procedure A5.1 Before the test, the sample should be flattened and placed under the conditions of A3. 16 h or more. A5.2 The zero position of the tensile machine should be calibrated before the test, and the appropriate measurement range should be selected. A5.3 Adjust the effective clamping distance between the upper and lower clamps to.200 mm. A5.4 Adjust the moving speed of the lower clamp of the tensile machine to (100 mm ± 10 mm)/min. A5.5 The specimen is clamped at the center of the holder. Under the pre-stressing force, the longitudinal axis of the specimen and the jaw line of the clamp form a right angle with each other. To avoid Prevent the specimen from sliding or damaging the specimen in the holder, and pad other rough and soft materials at the clamping site. A5.6 Start the tensile machine and record the maximum tensile force and the length of the specimen during the fracture of the specimen. A6 Expression of test results A6.1 Calculate the average breaking strength in the warp and weft directions according to formula (A1), accurate to 1 N. F = i = 1 Fi (A1) Where. F --- average breaking strength in warp or zonal direction, N/50 mm; ∑Fi --- the sum of the breaking strength of each sample in the warp or weft direction, N; n --- the number of samples. A6.2 Calculate the average elongation at break in the warp and weft directions according to formula (A2) and formula (A3). Ei = 100ΔL (A2) E = i = 1 Ei (A3) Where. Ei --- elongation at break of each sample in the warp or weft direction,%; ΔL --- the elongation at break of each sample in the warp or weft direction, mm; L --- effective clamping length in warp or weft, mm; E --- average elongation at break in warp or weft direction,%; n --- the number of samples.

Appendix B

(Standard appendix) Determination of warp and weft tearing force of coated fabric base cloth B1 Principle Cut two knife edges in parallel on the sample according to the specified size, and then stretch it on the tensile machine at a certain traction speed. During the process, the force of one or more yarns perpendicular to the cutting edge is broken. B2 Equipment B2.1 The measurement range is 0 ~ 1 kN, constant speed tensile machine with accuracy of ± 1%, when using inertial tensile machine to measure force, it should be within the range of Measured within 15% ~ 85%. B2.2 The tensile machine should have a reading and recording device. B2.3 The clamping surfaces of the upper and lower clamps of the tensile machine should be grooved or corrugated. B2.4 The moving speed of the gripper under the tensile machine should be 0 ~ 500 Continuously adjustable in the range of mm/min. B3 Test conditions The temperature of the laboratory is 20 ± 2 ℃, relative humidity is (65 ± 5)%. When testing under non-standard conditions, the Temperature and relative humidity. B4 sample and its preparation B4.1 According to GB/T 10111 standard random sample (5 from the cloth end) cut outside m), the number of samples is not less than 3 m2. B4.2 The sample should be processed so that the warp and weft yarns are firm and not slipping. Treatment of fiberglass cloth The method can be evenly painted on one side of the sample with a polyvinyl alcohol aqueous solution or 401 adhesive (diluted with ethyl acetate, the ratio of 1. 1) (vertical and horizontal Brush in each direction), and then let it stand at room temperature for 24 The test was performed after h. B4.3 The processed samples are cut into 5 pieces of warp and weft samples according to the arrangement of Figure B1. Figure B1 Sample arrangement B4.4 The size of each sample shall meet the requirements of Figure B2. Figure B2 Schematic of sample size B4.5 Cut two knife edges parallel to the warp or weft direction in the length direction of the sample, and the knife length is 100 mm, the distance between the two blades is mm. B5 Test procedure B5.1 Before the test, the sample should be placed flat under the conditions of B3. 16 h or more. B5.2 The zero position of the tensile machine should be calibrated before the test, and the appropriate measurement range should be selected. B5.3 Adjust the initial distance between the upper and lower clamps of the tensile machine to 100 mm. B5.4 Install the recording paper on the recorder of the tensile machine. B5.5 Adjust the moving speed of the lower clamp of the tensile machine to (100 mm ± 10 mm)/min. B5.6 The upper clamp clamps the middle tongue of the sample along the line bc shown in Figure B2. the lower clamp symmetrically clamps the other 2 along the lines ab and cd Tongues. The specimen shall be well clamped and shall not slide or be interrupted. B5.7 Start the tensile machine for testing (effective tear length is 100 mm) and read the maximum tearing force, accurate to 1 N. B6 Expression of test results B6.1 Select 5 high peaks on the recording paper and take the arithmetic mean of the tearing force of each sample, accurate to 1 N. B6.2 Take the arithmetic mean of the tearing force of the five samples in the warp and weft directions as the tearing force in the warp and weft directions, accurate to 1 N.

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