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GB/T 35795-2017 (GB/T35795-2017)

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GB/T 35795-2017: PDF in English (GBT 35795-2017)
GB/T 35795-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
Y 28
Biodegradable mulching film for agricultural use
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification of biodegradable mulching film for agricultural use ... 6 
5 Technical requirements ... 7 
6 Test methods ... 9 
7 Inspection rules ... 12 
8 Marks, packaging, transport, storage ... 14 
Biodegradable mulching film for agricultural use
1 Scope
This Standard specifies requirements, test methods, inspection rules, marks,
packaging, transport and storage of biodegradable mulching film for agricultural
use.
This Standard is applicable to biodegradable mulching film for agricultural use
that uses one or more resins in aliphatic polyesters, aliphatic-aromatic
copolyesters, carbon dioxide-epoxy copolymers, and other biodegradable
polymers that have biodegradation characteristics as main compositions, that it
is allowed to add appropriate proportion of biodegradable natural polymer
materials such as starch and cellulose, as well as other inorganic fillers and
functional additives without environmental hazards to formulation, that is
produced by processes such as blow molding or casting.
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, Test method for water vapor transmission of plastic film and
sheet - Cup method
GB/T 1040.1, Plastics - Determination of tensile properties - Part 1: General
principles
GB/T 1040.3, Plastics - Determination of Tensile Properties - Part 3: Test
Conditions for Films and Sheets
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 2918, Plastics - Standard atmospheres for conditioning and testing
GB/T 6672, Plastics film and sheeting - Determination of thickness by
mechanical scanning
GB/T 6673, Determination of Length and Width of Plastics Film and Sheeting
GB/T 15337, General rules for atomic absorption spectrometric analysis
GB/T 16422.1, Plastics - Methods of the exposure to laboratory light sources
- Part 1: General guidance
GB/T 16422.2-2014, Plastics - Methods of exposure to laboratory light
sources - Part 2: Xenon-arc sources
GB/T 19276.1, Determination of the ultimate aerobic biodegradability of
plastic materials in an aqueous medium - Method by measuring the oxygen
demand in a closed respirometer
GB/T 19276.2, Determination of the ultimate aerobic biodegradability of
plastic materials in an aqueous medium - Method by analysis of evolved
carbon dioxide
GB/T 19277.1, Determination of the ultimate aerobic biodegradability of
plastic materials under controlled composting conditions - Method by
analysis of evolved carbon dioxide - Part 1: General method
GB/T 19277.2, Determination of the ultimate aerobic biodegradability of
plastic materials under controlled composting conditions - Method by
analysis of evolved carbon dioxide - Part 2: Gravimetric measurement of
carbon dioxide evolved in a laboratory-scale test
GB/T 22047, Plastics - Determination of the ultimate aerobic biodegradability
in soil by measuring the oxygen demand in a respirometer or the amount of
carbon dioxide evolved
QB/T 1130, Plastics Angle Tear Performance Test Method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 biodegradable materials
Materials that are degraded by the presence of microorganisms in nature under
conditions such as soil and/or sand, and/or under specific conditions such as
composting conditions or anaerobic digestion conditions or aqueous culture
fluids, and eventually completely are degraded into carbon dioxide (CO2) or/and
methane (CH4), water (H2O) and mineralized inorganic salts of elements
contained therein and new biomass
3.2 biodegradable mulching film for agricultural uses; biodegradable
mulching film
Sample condition adjustment shall be in accordance with GB/T 2918.
Temperature is 23°C ± 2°C. Adjustment time is not less than 4h. Perform test
under such conditions, excluding appearance, net mass deviation.
6.3 Thickness deviation
According to GB/T 6672, use thickness measuring meter of which accuracy is
0.001mm to measure. Calculate limit thickness deviation according to formula
(1). Calculate average thickness deviation according to formula (2).
Where,
Δd - Limit thickness deviation, in millimeters (mm);
dmax or min - Actually-measured maximum or minimum thickness, in millimeters
(mm);
d0 - Nominal thickness, in millimeters (mm).
Where,
d - Average thickness deviation, %;
dn - Average thickness, in millimeters (mm);
d0 - Nominal thickness, in millimeters (mm).
6.4 Limit width deviation
According to GB/T 6673, use measuring tape or steel ruler of which accuracy
is 1mm to measure. Calculate limit width deviation according to formula (3).
Where,
Δw - Limit width deviation, in millimeters (mm);
wmax or min - Actually-measured maximum or minimum width, in millimeters (mm);
w - Nominal width, in millimeters (mm).
d max or min
w max or min
6.10 Heavy metal content
When testing heavy metal content, perform microwave digestion to sample
through high-pressure system. Then use atomic absorption spectrophotometer
to test according to GB/T 15337.
6.11 Biodegradability
Determine organic component (volatile solid content) according to Method A in
GB/T 9345.1. Measurement temperature is 650°C.
Use any method in GB/T 19277.1, GB/T 19277.2, GB/T 19276.1, GB/T 19276.2,
GB/T 22047 to perform biodegradability test. In arbitration inspection, use GB/T
19277.1.
6.12 Artificial weathering performance
Sample preparation and treatment are in accordance with GB/T 16422.1. Age
3 pieces for each kind of sample. Extract individual sample from aged large
sample to test. Take average value of three samples. Determinations for
nominal strain of initial fracture of sample and nominal strain of fracture after
exposure are in accordance with 6.7.
Test method is in accordance with GB/T 16422.2-2014. Irradiation method uses
Method A. Irradiance is narrow band (340 nm) 0.51 W/(m2ꞏnm). Temperature
control uses black mark thermometer. Exposure cycle uses cycle number 1.
Test duration is 100h.
7 Inspection rules
7.1 Batching
Biodegradable mulching films for agricultural use are inspected and accepted
in batches. One batch refers to products of continuous production of 50t from
same formula and same specification. If continuous production is one week but
production is less than 50t, one batch shall refer to one-week production.
7.2 Sampling
7.2.1 Limit width deviation, limit thickness deviation, appearance
According to once-sampling plan of normal inspection specified in GB/T 2828.1,
use general inspection level-I. Acceptance quality limit (AQL) is 6.5, see Table
10. Biodegradable mulching film for agricultural use per roll is one sample unit.
a) test stereotype identification of new product or old product conversion
production;
b) after formal production, for example, when structure, raw material, process
have significant changes that may affect product performance;
c) during formal production, after regular production or accumulation of a
certain amount of output, periodically perform an inspection to access
product’s quality stability;
d) when production is resumed after production has been discontinued for a
long time;
e) when results of exit-factory inspection and previous type inspection are
quite different;
f) when state quality supervision agencies require to carry out type
inspection.
7.4 Rules for determination
7.4.1 Determination for accepted items
Limit width deviation, limit thickness deviation and appearance are in
accordance with provisions of Table 10.
If there is any rejected item in inspection results of average thickness deviation,
mechanical properties, water vapor transmission rate, heavy metal content,
artificial weathering performance, it shall double sampling from this batch to re-
inspect the rejected item. If there is still a rejected item in re-inspection, this
item shall be rejected.
If there is rejected item in biodegradability, it shall not re-inspect but this item
shall be rejected.
7.4.2 Determination for accepted batch
When inspection results of all inspection items are accepted, this batch shall be
accepted.
8 Marks, packaging, transport, storage
8.1 Marks
Each roll of biodegradable mulching film for agricultural use shall be attached
with product certificate, including: product name, category (including water
vapor transmission category, effective service life), width, thickness, reference
......
 
(Above excerpt was released on 2019-09-14, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT35795-2017