FZ/T 54025-2009Polyamide 66 pre-oriented yarn (English PDF)

6.1.2 Sampling and specimen preparation

According to GB/T 6502, 20 laboratory samples are obtained and humidified under the conditions specified in 6.1.1.2.If the supplier and the purchaser have an agreement, the humidity can be adjusted according to the rapid humidity adjustment method in

Appendix B. Specimens exceeding the specified moisture regain need to be pre- humidified.

6.2 Linear density test

It is performed according to GB/T 14343.

6.3 Tensile property test

It is performed according to GB/T 14344.

6.4 Yarn uniformity test

It is performed according to GB/T 14346.

6.5 Oil content test

It is performed according to GB/T 6504.

6.6 Appearance inspection

Refer to Appendix A or it is performed according to the agreement between the supplier and the purchaser.

6.7 Numerical rounding

The data of the test results shall be processed according to the provisions of GB/T 8170;

the decimal places shall be rounded as shown in Table 1.

7.1 Exit-factory inspection

7.1.1 Inspection items

7.1.1.1 Appearance inspection items refer to Appendix A or are inspected according to the requirements of both parties.

7.1.1.2 Physical performance items in Table 1 are all assessment items and are inspected according to the test methods specified in Chapter 6.

7.1.2 Group-batching rules

Periodic sampling is used to form inspection lots within a certain range. A production lot can be composed of one inspection lot or several inspection lots.

7.1.3 Sampling requirements

7.1.3.1 All appearance items are inspected. The appearance and barrel weight of the laboratory samples taken shall meet the corresponding grades.

7.1.3.2 Laboratory samples of physical performance items are taken for inspection according to GB/T 6502.

7.1.4 Comprehensive evaluation

7.1.4.1 Appearance inspection items are evaluated barrel by barrel, according to the requirements specified in Appendix A or the requirements of the supplier and purchaser.

7.1.4.2 The calculated values of each physical performance test item are compared with the limit values of the performance item indicators in Table 1, according to the rounding value comparison method in GB/T 8170, to evaluate the grade of each item.

7.1.4.3 The lowest grade of the physical performance items and appearance items in the inspection lot is finally determined as the grade of the batch of products.

7.2 Re-inspection rules

Within three months after a batch of products arrives at the consignee, it can be used for acceptance or re-submitted for reinspection where there is an objection to the quality.

If more than one-third of the batch of products are used, re-inspection shall not be applied. If the quality of the batch of products affects the quality of the post-processing products and causes serious losses, the supplier and the purchaser shall analyze the reasons, clarify the responsibilities, negotiate to deal with it. Damaged packages shall not be sampled.

7.2.1 Inspection items

Same as 7.1.1.

7.2.2 Group-batching requirements

9.1 Packaging

9.1.1 Each roll shall have a protective layer and shall be protected from damage in the packaging box.

9.1.2 The size of the rolls in each packaging box shall be as uniform as possible.

Different varieties, specifications, batch numbers, grades shall be packed separately.

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

9.2 Transportation

A canopy is required during transportation. During transportation, the packaging box shall be protected from damage and the items shall not be exposed to moisture.

9.3 Storage

The packaging boxes are stacked in batches and stored in a dry, clean, ventilated warehouse.

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