GB/T 20218-2021 (GB/T 20218-2006) PDF English
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GB
NATIONAL STANDARD
ICS 83.140.10
G 31
Biaxially oriented polyamide (nylon) film
双向拉伸聚酰胺(尼龙)薄膜
[ISO 15987.2003, Plastics - Film and sheeting –
Biaxially oriented polyamide (nylon) films, MOD]
Issued on: MARCH 10, 2006
Implemented on: OCTOBER 1, 2006
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword. 3
1 Scope.. 4
2 Normative references.. 4
3 Requirements.. 5
4 Test methods.. 6
5 Inspection rules.. 8
6 Marks, packaging, transport, storage. 10
Annex A (informative) Control list on chapter numbers between this Standard
and ISO 15987.2003.11
Annex B (informative) Technical differences and reasons between this Standard
and ISO 15987.2003.13
Biaxially oriented polyamide (nylon) film
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marks,
packaging, transport and storage for biaxially oriented polyamide (nylon) film.
This Standard is application to a polyamide (nylon) film obtained by biaxially
stretching a polyamide 6 resin as a main raw material in a flat film method
(hereinafter referred to as the film).
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. For dated references,
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 191-2000, Packaging and storage marks (eqv ISO 780.1997)
GB/T 1038-2000, Plastics - Film and Sheeting - Determination of Gas
Transmission - Differential-pressure Method (neq ISO 2556.1974)
GB/T 2410-1980, Determination of the luminous transmittance and haze of
transparent plastics (eqv ASTM D 1003.1997)
GB/T 2828.1-2003, Sampling procedures for inspection by attributea-
Part1.Sampling schemes indexed by acceptance quality limit(AQL) for lot-
by-lot inspection (idt ISO 2859-1.1999)
GB/T 2918-1998, Plastics - Standard atmospheres for conditioning and
testing (idt ISO 291.1997)
GB/T 6672-2001, Plastics film and sheeting - Determination of thickness by
mechanical scanning (idt ISO 4593.1993)
GB/T 6673-2001, Determination of Length and Width of Plastics Film and
Sheeting (idt ISO 4592.1992)
GB/T 10006-1988, Plastic film and sheet friction coefficient measuring
ruler with an accuracy of 0.5 mm.
4.4 Thickness
Carry out according to GB/T 6672-2001.Take 12 layers of film. Remove the
surface and bottom layers for overlay thickness measurement.
4.5 Width and length
Carry out according to GB/T 6673-2001.
4.6 Tensile strength and elongation at break
Carry out according to GB/T 13022-1991.The sample is 150 mm long and (15
± 0.1) mm wide. Distance between clamps is 100 mm. Test speed is (250 ± 25)
mm/min.
4.7 Heat shrinkage
Carry out according to GB/T 12027-2004.Test condition is (160±2)°C, time is 5
min.
4.8 Haze
Carry out according to GB/T 2410-1980.
4.9 Coefficient of friction
Carry out according to GB/T 10006-1988.
4.10 Tear resistance
Carry out according to GB/T 11999-1989.Take 40 layers of samples to overlay
and test. Divide the measured result by 40 is the tear resistance of the sample.
4.11 Wetting tension
Carry out according to GB/T 14216-1993.
4.12 Oxygen transmission
Carry out according to GB/T 1038-2000.
4.13 Hygienic properties
Carry out according to GB 16332.
5 Inspection rules
5.1 Inspection classification
5.1.1 Exit-factory inspection
The exit-factory inspection items are all items expect the oxygen transmission
and hygienic properties in Clause 3.
5.1.2 Type inspection
The type inspection includes all items in Clause 3.Usually, the type inspection
should be conducted in one of the following cases.
a) test stereotypes identification of new product;
b) after the formal production, for example, when the structure, raw material,
process have significant changes that may affect product performance;
c) during formal production, conduct inspection once half year;
d) when production is resumed after the production has been discontinued
for more than six months;
e) when the results of the exit-factory inspection and the previous type
inspection are quite different;
f) when state quality supervision agencies require to carry out the type
inspection.
5.2 Batching and sampling
5.2.1 Batching
The sample unit for product sampling inspection is roll. For the products
continually manufactured under same process conditions, with same formula,
of same specifications, 100t shall be one batch. The yield less than 100t in a
week shall be one batch.
5.2.2 Sampling
Physical mechanical performance and hygienic performance take a roll from
any batch of products.
Appearance and size deviation use general inspection level as II specified in
GB/T 2828.1-2003, secondary sampling plan; AQL is 6.5.Perform sampling
inspection according to Table 3.
6 Marks, packaging, transport, storage
6.1 Marks
The product shall have a certificate of conformity, indicating the product name,
execution standard, size, mass, production date, inspection seal, manufacturer
name and address. Outside the box there are signs of fear of rain, fear of the
sun, fragile items, etc. in accordance with GB/T 191-2000.
6.2 Packaging
Each roll of film is protected at both ends with a foam pad and sealed with
moisture-proof packaging material. Both ends are plugged with plastic plugs (if
transported for a long distance, both ends are clamped into the carton). Tie with
plastic tape.
Special packaging is agreed by the supplier and the purchaser.
6.3 Transport
Be careful when transporting to prevent mechanical impact and sun and rain.
6.4 Storage
The film shall be stored in clean, dry warehouse, stacked properly, away from
heat and corrosive media, and not exposed to direct sunlight. The storage
period is one year from the date of production.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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