FZ/T 54007-2019Polyamide 6 drawn textured yarns (English PDF)

5.1 Product Grading

Products are divided into three grades. superior products (AA), first-class products (A) and

Determined through negotiation between the supply-side and the demand-side, or in accordance with the requirements of Appendix A.

6.1 Linear Density Test

Comply with the provisions of GB/T 14343.

6.2 Tensile Property Test

Comply with the provisions of GB/T 14344.

6.3 Crimp Contraction and Crimp Stability Test

Comply with the provisions of GB/T 6506.

6.4 Oil Content Test

Comply with the provisions of GB/T 6504.

6.5 Intertwining Degree Test

Comply with the provisions of FZ/T 50001.During arbitration, adopt Method A. manual needle movement method.

6.6 Dyeing Uniformity Test

Comply with the provisions of FZ/T 50008.

6.7 Compound Twist Degree

Comply with the provisions of GB/T 14345.

6.8 Appearance Inspection

Comply with the provisions of Appendix A, or as agreed between the supply-side and the demand-side.

6.9 Titanium Dioxide Content

Comply with the provisions of FZ/T 50027.

6.10 Moisture Regain Rate

Comply with the provisions of GB/T 6503.

7.1 Inspection Items

7.1.1 The items in Table 1 are all assessment items.

7.1.2 The appearance inspection items shall comply with the provisions of 5.4.

7.2 Batch Grouping Rules

Within a certain range, adopt periodic sampling to constitute inspection batches. A production batch can consist of one inspection batch or several inspection batches.

7.3 Sampling Rules

7.3.1 The laboratory samples for each item test in Table 1 shall be sampled in accordance with

GB/T 6502.Among them, full sampling shall be carried out for the dyeing uniformity test.

7.3.2 The sampling for appearance inspection shall be conducted barrel by barrel.

7.4 Assessment of Inspection Results

7.4.1 The determined values or calculated values of the property items shall be compared with the limit values of property indicators in Table 1 in accordance with the rounded value comparison method in GB/T 8170-2008 for grade assessment.

7.4.2 The appearance inspection shall be graded barrel by barrel in accordance with the provisions of 5.4.

7.4.3 For the assessment of the comprehensive grade of the products, the grade of the lowest property indicator and appearance indicator in the inspection batch shall be determined as the grade of the batch of products.

7.5 Re-inspection Rules

7.5.1 General rules

Within three months of the arrival of a batch of products to the recipient, re-inspection can be requested as a matter of acceptance or if there is any objection to the quality. If more than one- third of the batch of products has been used, the application for re-inspection is not allowed.

However, if the recipient can provide relevant evidence to prove that the batch of products has indeed affected the quality of the processed products and caused serious losses, the causes shall be analyzed, the responsibilities of both parties shall be clarified, and the matter shall be resolved through negotiation.

7.5.2 Inspection items

Same as 7.1.

R---the actual determined moisture regain rate, expressed in (%).

The conventional mass difference shall not exceed ± 0.5%; if it exceeds, it shall be determined through negotiation between the supply-side and the demand-side.

8.1 Marking

The packaging box shall be marked with product name, specifications, grade, batch No., net weight, gross weight, number of coils, packaging date, serial No. of product standard, trademark, manufacturing enterprise’s name, detailed address and other relevant information, as well as moisture-proof, handle with care and other warning signs.

8.2 Packaging

8.2.1 Each coil must be wrapped in a plastic bag before being put in the packaging box. There shall be a positioning device inside the packaging box to fix the coils, and the quality of the packaging shall be able to ensure that the coils are not damaged.

8.2.2 The size of coils in each packaging box shall be as uniform as possible. Products of different varieties, specifications, batch numbers and grades shall be respectively packaged, and mixed packaging is strictly prohibited.

8.2.3 Each batch of products shall be accompanied by a quality inspection sheet.

8.3 Transportation

During transportation, prevent the packaging box from being damaged, affected by moisture, exposed to the sun, tilted or inverted.

8.4 Storage

The packaging boxes shall be stacked in batches and stored in a dry, clean and well-ventilated place without direct exposure to the sun.

environment shall be free of other scattered light and reflected light. The visual distance is 0.30 m ~ 0.40 m (0.20 m ~ 0.25 m when inspecting the barrel for broken filaments), and the observation angle is 40° ~ 60° (parallel to the eye when inspecting the barrel for broken filaments).

A.2.2 Equipment

A.2.2.1 Illumination meter.

A.2.2.2 Grading table (vehicle).

A.2.2.3 Weighing scales, electronic scales and other weighing instruments whose calibration

division value is less than or equal to 0.1% of the coil mass, and 20% ~ 80% of the maximum weighing capacity can cover the coil mass.

A.3 Inspection Steps

A.3.1 Use the illumination meter to determine the illumination at the working point.

A.3.2 Rotate on the grading device for one turn to observe the two end faces and one column surface of the barrel.

A.3.3 Inspect each coil in accordance with the items required in A.1.2.

a) Check for broken filaments. The broken filaments have plush filaments, or the broken filament ends of monofilaments protrude from the surface of the multifilament and can be seen when facing the light. Calculate and record the number of filaments.

b) Check the filaments for ossified filaments and tight specks.

c) Check for oil stains by oil filaments, rusty filaments and stains that are difficult to clean with water under visual inspection, calculated by area, and record it.

d) Over-thrown yarns are based on the number and length of filaments at both ends of the barrel that deviate from the normal winding trajectory. Start from the length >= 2 cm, calculate the number and record it.

e) Weigh the mass of the coil, deduct the known tare mass, and the net mass is the barrel weight, accurate to 0.5%.

f) The color difference inspection is based on the color difference within the coil and between coils, then, compared with the grey scale for determination, and record it.

g) Check the coil formation to see if the barrel without coil package is too hard or too soft, uneven on three sides, or improperly positioned.

A.3.4 Record the results.

A.4 Comprehensive Grading

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