GB/T 10457-2021 PDF in English
GB/T 10457-2021 (GB/T10457-2021, GBT 10457-2021, GBT10457-2021)
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General requirement of plastic self-cling wrap film for keeping food fresh
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GB/T 10457-2021: PDF in English (GBT 10457-2021) GB/T 10457-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.01
CCS Y 28
Replacing GB/T 10457-2009
General requirement of plastic self-cling wrap film for
keeping food fresh
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 6
4 Classification ... 6
5 Requirements ... 6
6 Test methods ... 9
7 Inspection rules ... 13
8 Packaging signs, packaging, transportation, storage ... 16
General requirement of plastic self-cling wrap film for
keeping food fresh
1 Scope
This Standard specifies the terms and definitions, product classification, requirements,
test methods, inspection rules, packaging signs, packaging, transportation and storage
of plastic self-cling wrap film for food.
This Standard applies to plastic self-cling wrap film for food (hereinafter referred to as
the wrap film) that takes polyethylene (PE), polyvinyl chloride (PVC), polyvinylidene
chloride (PVDC), ethylene-vinyl acetate copolymer (EVA), polybutylene terephthalate-
adipate (PBAT) and other resins as the main raw material, is produced by single-layer
extrusion or multi-layer co-extrusion process.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1037-1988, Test method for water vapor transmission of plastic film and sheet.
Cup method
GB/T 1038-2000, Plastics - Film and Sheeting - Determination of Gas Transmission
- Differential-pressure Method
GB/T 1040.3-2006, Plastics - Determination of Tensile Properties - Part 3: Test
Conditions for Films and Sheets
GB/T 2410-2008, Determination of the luminous transmittance and haze of
transparent plastics
GB/T 2828.1-2012, Sampling procedures for inspection by attributea - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 2918-2018, Plastics - Standard atmospheres for conditioning and testing
GB/T 6672-2001, Plastics film and sheeting - Determination of thickness by
mechanical scanning
GB/T 6673-2001, Determination of Length and Width of Plastics Film and Sheeting
QB/T 1130-1991, Plastics Angle Tear Performance Test Method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 self-cling wrap film for keeping food fresh
The film that has self-adhesive and food preservation or cleaning function when it is
used for packaging food.
3.2 self-cling
The ability to stick that the self-cling wrap film has.
NOTE: It is quantitatively expressed as shear peel strength.
3.3 open-wrapping
The ease with which the wrap film is drawn out of the film roll during use.
3.4 anti-fogging
The ability of the wrap film to prevent water droplets or mist from forming on the
surface.
4 Classification
According to the processing technology of wrap film, wrap film can be divided into
single-layer self-cling wrap film and multi-layer co-extruded self-cling wrap film.
According to the material of the wrap film, the single-layer wrap film can be divided
into polyethylene self-cling wrap film, polyvinyl chloride self-cling wrap film,
polyvinylidene chloride self-cling wrap film, polybutylene terephthalate-adipate glycol
ester self-cling wrap.
5 Requirements
5.1 Size deviation
5.1.1 Thickness deviation
The thickness deviation of the wrap film shall meet the requirements in Table 1.
H0 - Nominal moisture permeability, in grams per square meter 24 hours [g/(m2 • 24h)];
ΔH - Moisture permeability deviation.
6.4.5 Right angle tear strength
Test according to QB/T 1130-1991. The sample is a single-layer film.
6.4.6 Self-cling (shear peel strength)
6.4.6.1 Specimen preparation
Cut ten specimens of 50mm long and 25mm wide. Two pieces is a set. Make each set
of specimens overlap end to end. The length of the overlapping joint is 15mm. The
width is 25mm. Lay the specimen on a smooth surface. Use a rubber roller (diameter is
40mm, length is 100mm, mass is 300g) to reciprocate 3 times on the overlapping part
of the specimen. Make sure that no air remains between the two layers of wrap film at
the overlap. Place the prepared specimen in the test environment for 20min. Then test.
6.4.6.2 Test method
Stretch each set of specimens on a tensile machine. Measure the force required to
separate two specimens. The result is the arithmetic mean of five sets of specimens. The
test equipment shall comply with the provisions of GB/T 1040.3-2006. The stretching
speed is 250mm/min±50mm/min.
Calculate self-cling (shear peel strength) according to formula (7):
Where,
T - Self-cling (shear peel strength), in Newtons per square centimeter (N/cm2);
P - The force required to separate the specimen, in Newtons (N);
b - The overlapping width, in centimeters (cm);
a - The overlapping length, in centimeters (cm).
6.4.7 Determination of open-wrapping
6.4.7.1 Preparation of specimen
Cut out six specimens with a width of 50mm and a length of 150mm. Two pieces is one
set. Adhesive surfaces are laminated to each other oppositely. The laminated length is
100mm. The processing and treatment methods are the same as 6.4.6.1.
7.2.1 Exit-factory inspection
The factory inspection items are appearance, size, tensile strength, nominal strain at
break, and self-cling.
7.2.2 Type inspection
Type inspection items are all the items specified in Chapter 5. Type inspection shall be
carried out when one of the following conditions exists:
a) When it is the first production;
b) When the variety of raw materials, product structure, production process or
equipment is changed;
c) When there is a big difference between the exit-factory inspection results and the
last type inspection results;
d) When the production is stopped for three months or more, when the production is
resumed;
e) When the production continues for one year;
f) When required by the relevant quality supervision departments of the country.
7.3 Sampling plan
7.3.1 Thickness deviation, width deviation, appearance
Adopt the special inspection level S-4 specified in GB/T 2828.1-2012 and the
secondary sampling plan of normal inspection, as shown in Table 5. The sample unit is
volume.
8 Packaging signs, packaging, transportation, storage
8.1 Packaging signs
The boxes and bags shall be marked with at least:
a) Product name;
b) Product quantity, specification (nominal thickness, nominal width, nominal
length);
c) Manufacturer's name;
d) Production date and effective use period;
e) Product material and type;
f) Reference to this document;
g) Words like "for food contact" and "for food";
h) Use warnings or other instructions.
Non-PVDC wrap film shall be marked with the nominal values of oxygen permeation
[unit is cm3/(m2·24h·0.1MPa)], carbon dioxide permeation [unit is
cm3/(m2·24h·0.1MPa)] and moisture permeability [unit is g/(m2·24h)].
For all kinds of additives with a mass content of more than 1%, their specific names or
chemical structural formulas shall be marked.
If the wrap film is declared to be microwaveable, it shall be marked with
"microwaveable", the heating method and the maximum temperature resistance.
8.2 Packaging
8.2.1 Inner packaging
Pack in airtight film bags or carton with rack.
8.2.2 Outer packaging
The product is packaged in a carton or other suitable packaging.
8.3 Transportation
Pay attention to moisture and sun protection during product transportation. In the
process of loading and unloading, it shall be lifted and placed lightly, without heavy
pressure.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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