This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of rubber pencil erasers. This standard applies to rubber pencil erasers. QB/T 2336-1997 Rubber pencil erasers QB/T2336-1997 Standard download decompression password: www.bzxz.net

QB/T2336-1997
In order to strengthen the unification of the industry standards for rubber pencil erasers and make the standards more comprehensive, reasonable and accurate. According to the requirements of the "Light General Quality (1994) No. 8 Document" of the China Light Industry Association and the long-term experience of domestic rubber pencil erasers, the industry standards for rubber pencil erasers were compiled with reference to the latest standards of the same industry at home and abroad.
This standard was proposed by the Quality Standards Department of the China Light Industry Association. This standard is under the jurisdiction of the National Sports Goods Standardization Center. The drafting unit of this standard: Shanghai Jingyi Rubber Factory. The main drafter of this standard: Shuai Baohua.
Light Industry Industry Standard of the People's Republic of China
Rubber Pencil Eraser
QB/T 2336.. 1997
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of rubber pencil erasers. This standard applies to rubber pencil erasers.
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T149--1995 Pencils
GB/T 2828—1987
Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to the inspection of continuous batches) Periodic inspection counting sampling procedures and sampling tables (applicable to the inspection of production process stability) GB/T 2829-1987
GB/T12654---1990
3 Product classification
Writing paper
3.1 Rubber pencil erasers are divided into high-end products and popular products according to their quality. 3.2 Rubber pencil erasers are composed of different products according to their different appearances. 3.3 Special specifications shall be resolved through negotiation between the supply and demand parties. 4 Technical requirements
Appearance quality
The rubber pencil eraser should be evenly shaped, without uneven color and dirt, and the trademark should be printed well. There should be no obvious defects that damage the appearance.
4.2 Quality indicators
Should meet the requirements of Table 1.
Hardness HS
Elimination rate, %
Abrasion rate, %
Hardness difference after aging AHS
5 Test methods
Physical and chemical indicators
High-grade products
Above 45
Popular products
Above 45
Applicable provisions
5.1 The samples used for testing should be rubber pencil erasers that have been stored at a constant temperature of (25±2)°C for more than 24 hours after production, and measured at room temperature (25±2)°C.
Approved by China Light Industry General Association on December 4, 1997
Implemented on August 1, 1998
5.2 Visual inspection for appearance.
5.3 Hardness test
QB/T 2336--1997
5.3.1 Hardness test: Use a Shore hardness tester. The pressure needle should touch the surface of the pressurized sample vertically and lightly, and read the scale correctly immediately. Test three different parts of each sample, and take the average value as the hardness of the test sample. 5.3.2 Hardness difference after aging (AHS) test
Cut the sample into two halves one by one, one half is tested for hardness according to 5.3.1, and the other half is aged for 24 hours at (70±1)℃. After the sample is taken out, place it at (25±2)℃ for 2 hours, and then test the hardness again according to the method in 5.3.1. The difference between the two is the hardness difference after aging (△HS). 5.4 Erasure rate test
5.4.1 Test piece preparation method
Cut a sheet with a thickness of (5.0±0.2) mm from the sample and process the part in contact with the test paper into an arc shape with a radius of (6±1) mm.
5.4.2 Preparation method of colored paper
Colored paper is made according to the following method:
a) Pencil for coloring: high-grade HB pencil specified in GB/T149; b) Test paper: 80g/m2 writing paper specified in GB/T12654, c) Load is 0.3kgf (2.94N);
d) Marking speed: (310±10)cm/min; e) Line spacing: 0.3mm;
f) The angle between the pencil lead and the surface of the test paper on the marking machine is 75°±5°; g) Pencil lead shape: The pencil lead tip is sharpened to a cone with a diameter of 0.6mm; h) Coloring width: (8±1)mm.
5.4.3 Test steps
5.4.3.1 Align the pencil eraser vertically to the colored paper and make contact with the colored line at right angles. Apply a load of 0.5kgf (4.9N) and rub back and forth along the colored line 4 times at a speed of (36±2)cm/min. At this time, use a brush to gently sweep away the debris on the rubbed part.
5.4.3.2 Measure with a photo test densitometer or a device with equivalent performance or above. The density of the non-colored part of the colored paper is set to zero, and then the density of the colored part and the erased part are measured separately. 5.4.3.3 The erasure rate is calculated according to formula (1). E(%) (1
Wherein: E-erasure rate,
M-concentration of the erased part;
C-concentration of the colored part.
5.5 Abrasion rate test
5.5.1 The abrasion rate test and the erasure rate test are carried out simultaneously. 5.5.2 The abrasion rate is calculated according to formula (2): K(%):
Wherein: K-abrasion rate;
P-mass of the rubber sample;
P2-mass of the rubber sample after erasure. M,
)×100
（2）
6 Inspection rules
QB/T2336-.1997www.bzxz.net
6.1 Products must be inspected and qualified by the quality inspection department of the manufacturer before they can leave the factory, and should be accompanied by a product certificate. 6.2 Acceptance inspection
6.2.1 Acceptance inspection is carried out according to the normal sampling plan specified in GB/T2828, with the inspection level of I. The test item terms, test method terms and qualified quality level (AQL) values ​​are as specified in Table 2. Table 2
Test item terms
Test method terms
Qualified quality level (AQL)
6.2.2 The qualified batch of products shall be accepted in batches. The unqualified batch of products shall be allowed to be submitted for inspection again after the unqualified products are eliminated on the basis of 100% inspection by the supplier.
6.3 Type inspection
6.3.1 The samples for type inspection must be randomly selected from the qualified batch of factory inspection. In normal production, type inspection shall be carried out every six months. 6.3.2 Type inspection shall be carried out in the following situations. a) When the process is changed or the main raw materials are replaced; b) When the production is resumed after a stoppage of more than half a year;
c) When the inspection results of the factory products are significantly different from the last type inspection; d) When the national quality supervision agency puts forward the type inspection requirements. 6.3.3 Type inspection shall be carried out in accordance with GB/T2829, and the samples shall be randomly selected from the qualified batches of delivery inspection. Type inspection items, technical requirements clauses, test method clauses and unqualified quality level (RQL) values ​​shall be carried out in accordance with the provisions of Table 3. Table 3
Elimination rate
Abrasion rate
Hardness difference after aging
Technical requirements clauses
Test method clauses
Unqualified classification
Unqualified quality level (RQL)
If the inspection meets the requirements of this standard, it means that the type inspection of the products in this cycle has passed. If the type inspection fails, the reasons should be analyzed immediately, measures should be taken to eliminate the unqualified factors until the type inspection passes, and the unqualified products in the cycle should be handled in time. 7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 Product marking: Each box must have a product certificate. 7.1.2 Packaging marking: The packaging box should indicate the product model, weight, volume and manufacturer name. The packaging box should be firm and easy to transport. 7.2 During transportation, rubber pencil erasers should be protected from sunlight or rain and snow, and should be loaded and unloaded lightly. 7.3 Finished products should be stored in a dry and ventilated warehouse. Storage conditions: -5℃～30℃, relative humidity 50%～80%, not too high.
7.4 When storing finished products, they must not come into contact with acids, alkalis, oils, solvents and substances that damage rubber, and should be 1.5m away from heat sources. 7.5 Under the above transportation and storage conditions, the product has a shelf life of two years from the date of manufacture.
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