GB/T 41897-2022Quality requirements of desiccant for foods (English PDF)

3.1 Desiccant

A product that can absorb moisture through physical and/or chemical action, reduce the humidity in the corresponding sealed package to a certain level, and keep it for a certain period of time. where:

W --- Moisture absorption rate, %; m1 --- The mass of the sample after absorbing water, in grams (g); m2 --- The mass of the sample before absorbing water, in grams (g).

6.3 Drop performance

Take 3 individually packaged desiccants and drop them naturally from a height of 1.2 m to a horizontal rigid smooth surface.

6.4 Right-angled tearing strength

The test shall be carried out according to the method specified in QB/T 1130.

6.5 Heat sealing strength

The test shall be carried out according to the method specified in QB/T 2358.

6.6 Anti-leakage powder performance

Choose a leak-proof powder performance testing machine with a vertical oscillation amplitude of 40 mm and an oscillation frequency of 50~350 times/min. Put a clean ultra-thin polyethylene (PE) bag with constant weight into a clean non-stick powder test basket, and ensure the ultra-thin PE bag with constant weight is closely attached to the non-stick powder test basket; place the non-stick powder test basket on the material rack with an adjustable stroke of the equipment. Take multiple packs of desiccants with a total amount of not less than 150 g and place them flat in the non-stick powder test basket; close the equipment cover, start the oscillation function of the equipment and vibrate for 30 minutes; open the equipment cover after the oscillation is over, take out the ultra-thin PE bag with constant weight, and weigh it; record all dust values.

6.7 Tensile strength

The test shall be carried out according to the method specified in GB/T 1040.3.

6.8 Peel strength

The test shall be carried out according to the method specified in GB/T 8808.

7.1 Batch formation

The same product produced by the same batch of raw materials, the same process, and the same shift is a batch.

7.2 Sampling method and quantity

Samples are taken by random sampling method, and the number of samples shall meet the inspection requirements.

7.3 Factory inspection

7.3.1 Each batch of products shall be inspected by the factory's own quality inspection department according to the factory inspection items. The products can leave the factory after passing the inspection.

7.3.2 The factory inspection items shall include sensory, anti-leakage powder, drop (except fiber desiccant), heat sealing strength, and right-angled tearing strength.

7.4 Type inspection

7.4.1 During normal production, the type inspection shall be carried out once a year. In one of the following situations, type inspection shall also be carried out:

a) Appraisal of new product trial production;

b) During normal production, if there are major changes in raw materials and processes, which may affect product quality;

c) When the production is resumed after the product has been discontinued for a long time;

d) When there is a large difference between the factory inspection result and the last type inspection result;

e) When the relevant national supervisory organization requests a type inspection.

7.4.2 The type inspection items include all or part of the items stipulated in 5.2 and 5.3 agreed by the supplier and the purchaser.

7.5 Judgment rules

7.5.1 If all inspection results conform to this document, this batch of products can be determined to be qualified.

7.5.2 If any item is unqualified in the inspection results, double samples can be taken from the same batch of products for re-inspection. If there is still one unqualified item after the re-inspection, the batch of products shall be judged to be unqualified. […]