GB/T 24454-2009 English PDF (GBT24454-2009)
GB/T 24454-2009 English PDF (GBT24454-2009)
GB/T 24454-2009: Plastic refuse sack
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Plastic Refuse Sack
ISSUED ON: OCTOBER 15, 2009
IMPLEMENTED ON: MARCH 1, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People’s Republic of
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification ... 4
4 Identification ... 5
5 Requirements ... 6
6 Test Methods ... 8
7 Inspection Rules ... 14
8 Marking, Packaging, Transportation and Storage ... 17
Plastic Refuse Sack
This Standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of plastic refuse sack.
This Standard is applicable to plastic refuse sacks made from films with resin as the main raw material and processed through sack-making processes, for example, heating sealing or bonding.
2 Normative References
Through the reference in this Standard, the clauses of the following documents become clauses of this Standard. In terms of references with a specified date, all the subsequent modification sheets (excluding the corrected content) or revised versions are not applicable to this Standard. However, the various parties that reach an agreement in accordance with this Standard are encouraged to explore the possibility of adopting the latest version of these documents. In terms of references without a specified date, the latest version is applicable to this Standard.
GB/T 1040.3-2006 Plastics - Determination of Tensile Properties - Part 3: Test Conditions for Films and Sheets (ISO 527-3:1995, IDT)
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute - Part 1: Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection (ISO 2859-1:1999, IDT)
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)
In accordance with purpose, plastic refuse sacks may be divided into refuse sacks for unclassified garbage collection and refuse sacks for classified household garbage collection.
In accordance with shape, refuse sacks may be divided into standard plastic refuse sacks, plastic refuse sacks with a drawstring, four-ear plastic refuse sacks, two-ear The tensile strength of drawstring shall be greater than or equal to 40 N. 5.4.2 Hanging test
After 10 refuse sack samples are tested, the number of unbroken samples shall be greater than or equal to 9.
6 Test Methods
Take a sufficient number of samples from the plastic refuse sack for testing. 6.2 Sample Conditioning and Test Environment
Conduct sample conditioning and tests under the standard environment (temperature 23 °C ± 2 °C, humidity 50% ± 10%) specified in GB/T 2918-1998. The duration of conditioning shall be not less than 4 h.
6.3 Thickness Deviation
Open a plastic refuse sack; cut it open, then, spread it out on one side. Use a thickness gauge to measure the thickness of film on one side. In accordance with the stipulations of GB/T 6672-2001, conduct the measurement. Along the width direction of the plastic refuse sack, uniformly measure 8 points. In accordance with Formula (1) and Formula (2), use the recorded data to calculate the limit deviation and average deviation of thickness. When the plastic refuse sack has embossed lines or formed threads, the embossed lines or formed threads shall be flattened, then, the thickness of the flattened area shall be measured.
e---limit deviation of thickness, expressed in (mm);
emin or max---actually measured minimum or maximum thickness, expressed in (mm); e0---nominal thickness, expressed in (mm).
e---average deviation of thickness, expressed in (%);
emin or max
than or equal to 520 mm, use a 38 mm ball for observation. When the effective width P is greater than or equal to 520 mm, use a 61 mm ball for the test. If the ball does not pass through the breakage, then, it signifies that the refuse sack is qualified; if the ball passes through the breakage, then, it signifies that the refuse sack is disqualified. 6.8 Tensile Resistance of Refuse Sacks with a Drawstring
6.8.1 Tensile strength of drawstring
Directly take the drawstring as a sample string. In accordance with GB/T 1040.3-2006, conduct the test; the test rate is 500 m/min. Test 10 samples; take the average value of the results.
6.8.2 Hanging test
In accordance with Table 6, put in the load. After sealing, lift the drawstring (see Figure 2 for the lifting hook); it shall not be kinked. Place the loaded refuse sack on the equipment, as it is shown in Figure 3. The flat panel, on which, the refuse sack is placed, shall be kept at a sufficient distance from the ground, so as to ensure that the refuse sack will not touch the ground during the test (except for the damage of refuse sacks). Hang the drawstring of the refuse sack on the hook without stretching.
Make the plate instantly fall off, so that the sample freely falls.
When the following circumstances occur, the refuse sack shall be determined as disqualified in the hanging test.
a) The drawstring is disconnected from the refuse sack from the joint;
b) The drawstring is broken, or the sealing area is broken;
c) The hanged area is broken.
See Figure 4 for some examples of disqualification in the hanging test. Test 10 samples.
7.2.1 Exit-factory inspection
Exit-factory inspection items are appearance, size deviations, anti-dropping and anti- leakage performance.
7.2.2 Type inspection
Type inspection items are all items in the requirements. Under one of the following circumstances, type inspection shall be conducted:
a) Trial production and model appraisal when new products or old products are transferred to another factory for production;
b) After formal production, when there are relatively significant changes in structure, material and process;
c) After normal production, type inspection shall be conducted at least once a year;
d) When production is suspended for half a year, then, resumed;
e) When there are relatively significant differences between the exit-factory inspection result and the previous type inspection;
f) When a national quality supervision and inspection institution proposes a request for type inspection.
7.3 Sampling Scheme
7.3.1 Appearance and size deviations
The exit-factory inspection shall comply with the sampling procedures by attribute in GB/T 2828.1-2003. The secondary normal sampling with the inspection level (IL) being the general inspection level-II and the acceptance quality limit (AQL) being 6.5 is used. The batch size, sampling size and number for determination are shown in Table 7. Each unit of packaging is considered as a sampling unit; unit packaging may be a box, bundle, bag and piece, etc. During the test, randomly take a sample from each unit of packaging for inspection.
220.127.116.11 Anti-leakage and anti-dropping performance, and tensile resistance of refuse sack with a drawstring
When there are disqualified items in anti-leakage and anti-dropping performance, and tensile resistance of refuse sack with a drawstring, take double samples from the original batch to respectively conduct re-inspection of the disqualified items. If the re- inspection results are all qualified, then, it shall be determined as qualified in the item, otherwise, it shall be determined as disqualified.
7.4.2 Determination of qualified batch
If the inspection results of all inspection items are qualified, then, the batch shall be determined as qualified.
8 Marking, Packaging, Transportation and Storage
The packaging box and bag shall be marked with:
a) Serial No. of this Standard;
b) Product name;
c) Quantity of products;
d) Specifications and sizes: effective width effective length nominal thickness, expressed in (mm);
e) Name of manufacturer;
f) Production date and storage period;
g) Texture or type of product;
h) Attached quality inspection certificate.
Daily plastic bags are generally packed in plastic films or cartons, or, in a mode determined by the demand-side and the supply-side through negotiation.
For refuse sacks with a drawstring, when the drawstrings are separated from the refuse sacks, the number of drawstrings in the packaging box shall be not less than the number of refuse sacks being packed.