GB/T 14189-2015Fiber grade polyester chip (PET) (English PDF)

3.1 Bright Polyester Chip (PET)

Bright polyester chip refers to polyester chip (PET) that does not go through extinction treatment.

3.2 Semi-dull Polyester Chip (PET)

Semi-dull polyester chip refers to polyester chip (PET) whose titanium dioxide content is more than 0.20%, and less than or equals to 0.50 % (mass fraction).

7.1 Type of Inspection

Type of inspection may be divided into type inspection and exit-factory inspection. Under the following circumstances, type inspection shall be conducted:

a) Stipulated periodic inspection;

b) When there are changes of product design, process and raw materials that might affect product quality;

c) When the exit-factory result is largely different from the previous type inspection;

d) When a national inspection institution requests for type inspection.

7.2 Inspection Items

7.2.1 The various performance items in Table 1 are all items of type inspection.

7.2.2 Seven performance indexes in Table 1 (intrinsic viscosity, terminal carboxyl group content, chroma, diethylene glycol content, powder dust, irregular chip, titanium dioxide content) are exit-factory inspection items; the remaining is periodic inspection items.

7.3 Group Batch Rules

Within a certain range, adopt periodic sampling to constitute an inspection batch number. One production batch may be constituted of one inspection batch, or, it may be constituted of several inspection batches.

7.4 Sampling Stipulations

7.4.1 In exit-factory inspection, samples shall be automatically taken by online sampler, or, manually taken on the production line within a certain time interval.

7.4.2 The sampling of packed products shall comply with the stipulations in GB/T 6679.

The quantity of sampling packages shall comply with the stipulations in GB/T 6678.

7.4.3 Sampling amount for tests shall be not lower than 500 g. In arbitration, sampling amount shall be not lower than 1,000 g.

7.5 Determination Rules

7.5.1 The determined value or calculated value of performance items shall be compared in accordance with the rounded-off value comparison method stipulated in GB/T 8170 and the limit values of the indexes stipulated in Table 1. Then, determine […]