FZ/T 54024-2019Polyamide 6 pre-oriented yarns (English PDF)

4.1 In accordance with the amount of titanium dioxide added during production, the products

can be classified into glossy, semi-dull and full-dull yarns.

4.2 Product specifications are identified by linear density (dtex) and the number of

monofilaments (f), for example, if the linear density is 93 dtex and the number of

monofilaments is 68, the product specifications are expressed as. 93 dtex/68 f.

4.3 Product identification shall include. product specifications, color, product name or batch

No., which can be effectively distinguished.

5.1 Product Grading

Products are divided into three grades. superior products, first-class products and qualified

products.

5.2 Property Items and Indicators

See Table 1.

provisions of 5.3.

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.

7.5.3 Batch grouping rules

The batches are grouped in accordance with the original production batch, but the products with

a production date interval of more than 90 days cannot be grouped into batches in accordance

with the same batch No.

7.5.4 Sampling rules

7.5.4.1 The laboratory samples for property items shall be sampled in accordance with the

provisions of GB/T 6502.

7.5.4.2 The appearance shall be subject to sampling inspection. In accordance with the batch

size and the provisions of general inspection level II in Table 1 of GB/T 2828.1-2012, determine

the sample size (character code).

7.5.5 Re-inspection assessment

7.5.5.1 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.

7.5.5.2 For the appearance items, in accordance with the sample size in 7.5.4.2, and the AQL

value of the normal inspection one-time sampling scheme in Table 2-A of GB/T 2828.1-2012,

which is 4.0, determine the acceptance number Ac and the rejection number Re, and conduct the

assessment based on the contract indicators between the supply-side and the demand-side.

When the number of disqualified coils is <= Ac, it is the original grade; when the number of

disqualified coils is >= Re, then, it shall be determined as nonconforming with the original grade.

7.5.5.3 The comprehensive grade of the products shall be assessed in accordance with 7.4.3.If

it is higher than or equal to the original grade, then, it shall be determined as conforming; if it

is lower than the original grade, then, it shall be determined as nonconforming.

7.5.6 Conventional mass

In accordance with the provisions of GB/T 6503, determine the actual moisture regain, and the

conventional mass shall be calculated using Formula (1).

Where,

m---the conventional mass of the batch product packaging, expressed in (kg);

m1---the net mass of the batch product packaging, expressed in (kg);

R0---the conventional moisture regain rate of polyamide 6 pre-oriented yarns, which is 4.5%;

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.

Supported coils in the packaging box shall be positioned and fixed, and unsupported coils shall

be protected from damage.

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.

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