This standard is modified to adopt ISO15988:2003 "Plastic Film and Sheet Biaxially Stretch Polyester Film". This standard replaces GB/T16958-1997 "Biaxially Stretch Polyester Film for Packaging". This standard specifies the product specifications, requirements, test methods, inspection rules, marking, packaging, transportation and storage of biaxially stretch polyester film for packaging. This standard is applicable to film materials made of ethylene terephthalate resin as the main raw material, which are made by biaxial stretching process and can be used alone or in combination with other films. Compared with GB/T16958-1997, the main changes of this standard are as follows: - Added classification method; - Deleted Appendix A of the original standard, and included the requirements of oxygen permeability coefficient and water vapor permeability coefficient in the main text; - Modified the grade requirements of the product; - Modified the sampling plan. GB/T 16958-2008 Biaxially oriented polyester film for packaging GB/T16958-2008 Standard download decompression password: www.bzxz.net
This standard specifies the product specifications, requirements, test methods, inspection rules, marking, packaging, transportation and storage of biaxially oriented polyester film for packaging (hereinafter referred to as polyester film). This standard is applicable to film materials made of ethylene terephthalate resin as the main raw material and produced by biaxially oriented process, which can be used alone or in combination with other films.
This standard is modified and adopted ISO15988:2003 "Plastic Film and Sheet Biaxially oriented Polyester Film".
Compared with ISO15988:2003, the main differences of this standard are as follows:
---The test method standards are all national standards;
---The thickness deviation is divided into two different levels;
---The requirements for the inner diameter deviation of the film roll are deleted;
---The requirements for the length of the film roll, the number of joints and the length of each section are added;
---The gloss and friction coefficient items are added;
---The name of the thermal stability item is changed to thermal shrinkage;
---The performance indicators of some items are improved;
---Inspection rules and transportation and storage regulations are added.
This standard replaces GB/T16958-1997 "Biaxially oriented polyester film for packaging".
Compared with GB/T16958-1997, the main changes of this standard are as follows:
--- Added classification methods;
--- Deleted Appendix A of the original standard, and included the requirements of oxygen permeability coefficient and water vapor permeability coefficient in the main text;
--- Modified the grade requirements of products;
--- Modified the sampling plan.
This standard is proposed by China Packaging Federation.
This standard is under the jurisdiction of the National Technical Committee for Packaging Standardization (SAC/TC49).
The main drafting units of this standard are Fuwei Film (Shandong) Co., Ltd., Changzhou Zhongheng New Materials Co., Ltd., China Packaging Research and Testing Center, China Packaging Federation.
The main drafters of this standard are Niu Shumei, Liu Zhiqiang, Feng Shuming, Wang Zhenhua, Teng Yan, Wang Xiaojun, and Zhu Jing.
The previous versions of the standards replaced by this standard are:
--- GB/T16958-1997.
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard.
GB/T191 Pictorial marking for packaging, storage and transportation (GB/T191-2008, ISO780:1997, MOD)
GB/T1037 Test method for water vapor permeability of plastic film and sheeting - Cup method (GB/T1037-1988, neqASTM E96:1980)
GB/T1038 Test method for gas permeability of plastic film and sheeting - Pressure difference method (GB/T1038-2000, neqISO2556:1974)
GB/T1040.3 Determination of tensile properties of plastics - Part 3: Test conditions for films and sheets (GB/T1040.3-2006, ISO527-3:1995, IDT)
GB/T2035 Plastic terms and definitions
GB/T2410 Test method for light transmittance and haze of transparent plastics
GB/T2828.1 Sampling inspection procedure by attributes Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) (GB/T2828.1-2003, ISO2859-1:1999, IDT)
GB/T2918 Standard environment for conditioning and testing of plastic specimens (GB/T2918-1998, idtISO291:1997)
GB/T5009.60 Analytical method for hygienic standard of polyethylene, polystyrene and polypropylene moldings for food packaging
GB/T5009.101 Determination of antimony in polyester resins and their moldings for food containers and packaging materials
GB/T6672 Plastic film and sheet thickness determination - Mechanical determination method (GB/T6672-2001, idtISO4593:1993)
GB/T6673 Determination of length and width of plastic film and sheet (GB/T6673-2001, idtISO4592:1992)
GB/T8807 Test method for specular gloss of plastic film and solid plastics
GB/T10006 Test method for coefficient of friction of plastic film and sheet
GB13113 Hygienic standard for polyethylene terephthalate molded products for food containers and packaging materials
GB/T14216 Test method for wetting tension of plastic film and sheet (GB/T14126-1993, eqvISO8296:1987)

ICS55.040
National Standard of the People's Republic of China
GB/T16958--2008
Replaces GB/T16958-1997
Biaxially oriented polyester film for package[ISO15988:2003,Plastics-Film and sheeting—Biaxially orientedpoly(ethyleneterephthalate)(PET)films,MOD2008-06-10Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
2009-01-01Implementation
This standard modifies ISO15988:2003 "Plastics-Film and Sheeting Biaxially oriented polyester film".
Compared with ISO159882003, the main differences of this standard are as follows: the test method standards are all national standards; the thickness deviation is divided into two different levels; - the requirements for the inner diameter deviation of the film roll are deleted; - the requirements for the length of the film roll, the number of joints and the length of each section are added; the gloss and friction coefficient items are added; the name of the "thermal stability" item is changed to "thermal shrinkage"; the performance indicators of some items are improved:
Inspection rules and transportation and storage regulations are added. This standard replaces GB/T16958-1997 "Biaxially oriented polyester film for packaging". Compared with GB/T16958-1997, the main changes of this standard are as follows: - the classification method is added;
the original standard Appendix A is deleted, and the requirements for oxygen permeability coefficient and water vapor permeability coefficient are listed in the text; the product grade requirements are modified;
the sampling plan is modified.
This standard is proposed by the China Packaging Federation. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee (SAC/TC49). GB/T16958—2008
The main drafting units of this standard are: Fuwei Film (Shandong) Co., Ltd., Changzhou Zhongheng New Materials Co., Ltd., China Packaging Research and Testing Center, China Packaging Federation.
The main drafters of this standard are: Niu Shumei, Liu Zhiqiang, Feng Shuming, Wang Zhenhua, Teng Yan, Wang Xiaojun, Zhu Jing. The previous versions of the standards replaced by this standard are: GB/T16958—1997.
1 Scope
Biaxially oriented polyester film for packaging
GB/T16958—2008
This standard specifies the product specifications, requirements, test methods, inspection rules, marking, packaging, transportation and storage of biaxially oriented polyester film for packaging (hereinafter referred to as polyester film).
This standard is applicable to film materials made of ethylene terephthalate resin as the main raw material and produced by biaxially oriented process, which can be used alone or in combination with other films.
2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, the latest versions are applicable to this standard. GB/T191 Packaging storage and transportation pictorial mark (GB/T1912008, ISO780:1997, MOD) GB/T1037 Test method for water vapor permeability of plastic film and sheet - Cup method (GB/T1037-1988, neqASTME96:1980)
GB/T1038 Test method for gas permeability of plastic film and sheet - Pressure difference method (GB/T1038-2000, neqISO2556:1974)
GB/T1040.3 Plastics
Determination of tensile properties Part 3: Test conditions for films and sheets (GB/T1040.3-2006, ISO527-3:1995, IDT)
GB/T2035 Plastics terms and definitions
GB/T2410 Transparent plastics test method for light transmittance and haze GB/T2828.1 Attribute sampling inspection procedure Part 1: Sampling plan for deep batch inspection based on acceptance quality limit (AQL) (GB/T2828.1---2003 ISO2859-1.1999. IDT) GB/T2918 Plastic specimen condition adjustment and test Standard environment for testing (GB/T2918-1998, idtISO291:1997) GB/T5009.60 Method for analysis of hygienic standards for polyethylene, polystyrene and polypropylene moldings for food packaging GB/T5009.101 Determination of antimony in polyester resins and their moldings for food containers and packaging materials GB/T6672 Determination of thickness of plastic films and sheets by mechanical determination method (GB/T6672-2001, idtISO4593:1993) GB/T6673 Determination of length and width of plastic films and sheets (GB/T6673 —2001, idtISO4592:1992) GB/T8807 Test method for specular gloss of plastic film and solid plastic GB/T10006 Test method for friction coefficient of plastic film and sheet GB13113 Hygienic standard for polyethylene terephthalate molded products for food containers and packaging materials GB/T14216 Test method for wetting tension of plastic film and sheet (GB/T14126-1993eqvISO8296:1987) 3 Terms and definitions
The terms and definitions established in GB/T2035 and the following terms and definitions apply to this standard. 3.1
Biaxially oriented polyester film Biaxially oriented polyester film is a film made of polyester resin as the main raw material, which is melt-extruded and cast into sheets, and then stretched, oriented, heat-set and cooled in the longitudinal and transverse directions under certain process conditions. 1
GB/T16958-2008
4 Product classification
4.1 Polyester films are divided into corona films and non-corona films according to their types. 4.2 Polyester films are divided into films with barrier requirements and films without barrier requirements according to their performance. 5 Requirements
5.1 Appearance quality
5.1.1 The film should be free of obvious cracks, looseness, wrinkles, flaws, impurities and any defects that affect applicability. 5.1.2 The joints in the same roll of film should be clearly marked, and the joint position can be judged from the side of the film roll. The supply and demand parties should reach an agreement on the method of marking joints.
5.2 Sizes and specifications
5.2.1 Length and width deviations.
Requirements for length and width deviation are as follows:
Long can/%
C-shaped food/mm
5.2.2Thickness deviation
Requirements for thickness deviation
Nominal thickness/μm
5.2.3Number of joints per roll and length of each section, width deviation
Table 2Thickness deviation
Average thickness deviation/%
Superior products
Qualified products
Joints should be clearly marked, and the requirements for the number of joints and the length of each section are shown in Table 3. Table 3Number of joints per roll and the length of each section
Nominal thickness/μm
5.3Physical and mechanical properties
Requirements for physical and mechanical properties are shown in Table 4.
Superior product
Number of joints/piece
Qualified product
Superior product
Thickness deviation/%
Qualified product
Length of each section/m
≥2000
≥1000
≥300
Tensile strength/MPa
Elongation at break/%www.bzxz.net
Heat shrinkage /%
Glossiness/%
Moisture coefficient
Wet tension/(mN/)
Longitudinal·
Table 4 Physical and mechanical properties
≥170
Oxygen permeability (23℃, relative humidity 0%)ACm/(cm·s·Pa)D
Water vapor permeability (38℃, relative humidity 90%))[2l. 0. 1mm/(m*.24 h)
“Longitudinal direction is the same as the extruder direction.
b Transverse direction is perpendicular to
C Wetting tension items are only used for corona films.d Oxygen permeability coefficient and charm
Permeability coefficient tests are applicable to barrier polyester films.5.4
Sanitary properties
Polyester films that directly contact food should comply with the provisions of GB13113.6 Test methods
6.1. Standard environment for sample state adjustment and testing
Nominal thickness/μm
2.25×o-15
GB/T16958—2008
Standard environment for sample state adjustment and testing shall be carried out in accordance with the provisions of GB/T2918. The test environment conditions are 23℃±2℃, relative humidity 50%10%, and the sample is pretreated for more than 8h under this condition. 6.2 Sampling method
Remove 3 to 5 layers of film on the outer surface of the film roll to be tested and sample and prepare samples according to the requirements of the inspection items. 6.3 Appearance
Visually inspect under natural light or 40W fluorescent lamp, and the sampling area shall not be less than 1m2. 6.4 Size and specifications
6.4.1 Thickness
Carry out in accordance with the provisions of GB/T6672. The instrument measurement accuracy shall not be less than 1μm, and the number of thickness test layers shall be sampled according to Table 5. 3
GB/T16958—2008
Nominal thickness/μm
The average thickness deviation shall be calculated according to formula (1):
Wherein:
-Average thickness deviation, %;
3-Average thickness, in micrometers (um);%. Nominal thickness, in micrometers (μm). The thickness deviation shall be calculated according to formula (2):
Wherein:
W-Maximum (minimum) thickness deviation, %;
Table 5 Number of thickness test layers
8-%×100
8, Maximum (minimum) thickness, in micrometers (μm);%-Nominal thickness, in micrometers (μm). 6.4.2 Length and width deviation
Perform in accordance with the provisions of GB/T6673.
6.5 Physical and mechanical properties
6.5.1 Tensile strength and elongation at break
Number of test specimen layers/layer
-(2)
Test according to GB/T1040.3. The test specimen adopts type 2, a strip with a length of 150mm and a width of 15mm±0.1mm, a fixture spacing of 100mm, and a test speed of 100mm/min±10mm/min. Test 5 longitudinal and 5 transverse specimens respectively, and take the average value of each.
6.5.2 Thermal shrinkage
6.5.2.1 Test instruments
a) Oven, temperature accuracy ±1℃;
b) Steel ruler, graduation 0.5mm;
c) Chronometer.
6.5.2.2 Test specimens
The test specimens are 150 mm long and 20 mm wide. There are 5 specimens in each direction. Draw an initial mark of 100 mm in the middle of the test specimen, 25 mm away from both ends.
6.5.2.3 Test steps
Adjust the oven temperature to 150°C ± 3°C, quickly put the test specimen in and start timing. The test specimen is placed flat and kept for 30 minutes before being taken out. After cooling to the test environment temperature, measure the length of the test specimen in the direction and calculate the thermal shrinkage rate. Take the arithmetic mean as the measurement result, accurate to one decimal place.
6.5.2.4 The calculation of thermal shrinkage rate is shown in formula (3). Where:
Thermal shrinkage rate, %;
L-×100
-(3)
L. Length before heating, in millimeters (mm); L, — length after heating, in millimeters (mm). 6.5.3 Haze
Perform in accordance with the provisions of GB/T2410.
6.5.4 Gloss
Perform in accordance with the provisions of GB/T8807.
6.5.5 Friction coefficient test
Perform in accordance with the provisions of GB/T10006.
6.5.6 Wetting tension test
Perform in accordance with the provisions of GB/T14216.
6.5.7 Oxygen permeability coefficient
Test the oxygen permeability according to the provisions of GB/T1038, and calculate the oxygen permeability coefficient. 6.5.8 Water vapor permeability coefficient
GB/T16958-2008
Test the water vapor permeability according to GB/T1037 condition A, and then calculate the water vapor permeability coefficient of each 0.1mm film according to formula (4). Pv=WVTR.(d/o.1)..
Wherein:
Pv—water vapor permeability coefficient, unit is gram 0.1 mm per square meter 24 hours Lg·0.1mm/(m·24h）l; WVTR——water vapor permeability, unit is gram per square meter 24 hours Lg/(m24h)]: d—sample thickness, unit is millimeter (mm). 6.5.9 Hygienic performance
Perform in accordance with GB/T5009.60 and GB/T5009.101. 7 Inspection rules
7.1 Inspection classification
7.1.1 Factory inspection
Inspect the appearance and size specifications of the product in accordance with the requirements of 5.1 and 5.2. 7.1.2 Type inspection
Type inspection items are all items specified in Chapter 5. Type inspection should be carried out when one of the following situations occurs: a) When new products or old products are transferred to the factory for trial production and identification; b) After formal production, the material formula and production process have major changes that may affect product performance; c) After formal production, a type inspection is carried out once a year; d) When the product is stopped for 6 months and then resumed; e) When the national quality supervision and inspection agency proposes to conduct a type inspection. 7.2 Sampling
7.2.1 Batch
(4)
Products are inspected in batches. Products with the same raw materials, the same process and the same structure are considered as one inspection batch, and the maximum batch size shall not exceed 50t.
7.2.2 Sampling plan
7.2.2.1 Appearance, dimensions, specifications and requirements shall be in accordance with the provisions of GB/T2828.1, with special inspection level S-3, acceptance quality limit AQL=6.5, and normal inspection one sampling plan. 7.2.2.2 Physical and mechanical properties and hygienic properties A roll shall be randomly selected from the qualified products and inspected in accordance with the provisions of 5.3 and 5.4. 7.3 Determination
7.3.1 The inspection results of appearance, dimensions and specifications shall be individually determined according to the provisions of 5.1 and 5.2. If there are unqualified items, the volume shall be determined to be unqualified. The qualified batch shall be determined according to Table 6.
≤150
151~500
501~1000
≥1001
Table 6 Sampling and judgment of appearance and size specifications
Sample size
Number of acceptance
Unit is roll
Number of rejection
7.3.2 The results of the physical and mechanical properties inspection shall be individually judged according to the requirements of the items in 5.3. If one item is unqualified, the unqualified items shall be double sampled and re-tested in the original batch. If the re-test results are still unqualified, the batch shall be unqualified. 7.3.3 The hygienic properties shall be judged according to the requirements of 5.4. If one item is unqualified, the batch shall be judged unqualified. 8 Marking, packaging, transportation and storage
8.1 Marking
Product marking shall comply with the provisions of GB/T191. The corona film should be marked with the corona surface, the polyester film roll should have a product certificate, and the outside of the packaging should have the manufacturer's name, address, implementation standard number, trademark, product name, specifications, length, batch number, production date, etc. 8.2 Packaging
Each roll of polyester film should be protected by padding at both ends, wrapped with film, and tied tightly. Special packaging shall be agreed upon by the supply and demand parties. 8.3 Transportation
Polyester film should be handled with care when transporting to prevent mechanical collision and sun and rain. 8.4 Purchase and storage
Polyester film should be stored in a clean, dry, ventilated warehouse, away from heat sources and avoid direct sunlight. The storage period of corona-treated film is 12 months from the date of production, and that of non-corona-treated film is 24 months. It can still be used after passing the inspection after exceeding the storage period. 6
GB/T16958-2008
People's Republic of China
National Standard
Biaxially oriented polyester film for packaging
GB/T16958—2008
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