Some standard content:
BB/T0022-2004
Corrugated cardboard conveyor belt has a direct impact on the production process and product quality of corrugated cardboard. This standard is specially formulated to meet and promote the needs of conveyor belt manufacturers to standardize and improve product quality. The various technical indicators of this standard are determined by analyzing and comparing the indicator requirements of domestic conveyor belt enterprise standards and the test verification data of the collected samples.
This standard is proposed by the China Packaging Technology Association. This standard is under the jurisdiction of the National Packaging Standardization Technical Committee. This standard is drafted by the China Packaging Research and Testing Center, and Fushun Jinghua Conveyor Belt Co., Ltd. participated in the drafting. The main drafters of this standard are: Li Hua, Wang Zhenhua, Shao You, Han Xueshan, Li Jun, Meng Shufang, Niu Shumei, and Wang Qing. 1 Scope
Corrugated cardboard conveyor belt
BB/T0022--2004
This standard specifies the specifications, models, technical requirements, inspection methods, inspection rules of corrugated cardboard conveyor belts (hereinafter referred to as conveyor belts), as well as product marking, packaging, transportation and storage. This standard applies to conveyor belts made of polyester and other chemical fibers, cotton yarn and high-temperature resistant materials, which are suitable for corrugated cardboard production lines.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions are applicable to this standard. GB/T6388 Shipping and Receiving Marks for Transport Packages
GB/T10006 Determination of Friction Coefficient of Plastic Film and Sheet 3 Product Classification
3.1 Classification Method
Conveyor belts can be divided into two types: needle-punched type and woven type according to the processing method. Conveyor belts can be divided into two types: ordinary type and high-temperature type according to the use environment. The use temperature of ordinary type is 170℃~~190℃; the use temperature of high-temperature type is 190℃～210℃.
3.2 Product Specifications
According to the nominal thickness, it is divided into four basic specifications of 5.0mm, 6.0mm, 8.5mm and 10.0mm. Other thickness specifications are determined by negotiation between the supply and demand parties. The length and width of the product are determined by negotiation between the supply and demand parties. 3.3 Product Model
The product model includes name, category and specification. The expression method is as follows: WSD
Thickness (mm)
B (woven type) or Z (needle punched type)
P (ordinary type) or G (high temperature type)
Corrugated cardboard conveyor belt
For example: WSI).PB36.0, which means a woven cardboard conveyor belt with a thickness of 6.0mm for ordinary use. 4 Technical requirements
4.1 Appearance and dimensions
4.1.1 See Table 1 for appearance requirements.
BB/T 0022-—2004
Joining
Table of appearance requirements
The surface is flat and the color is uniform; the texture of the warp and weft lines is clear; there are no hard debris, holes, cracks, stains and other defects. The edges are straight, without obvious distortion and jagged edges. Closed joints are used at the joints, and the joints should be flush, dense, connected and neat and firm. See Table 2 for size deviation.
Dimension deviation
Nominal thickness/mm
Length deviation/(%)
Personal area mass deviation is shown in Table 3.
Personal area mass deviation/(%)
Physical and mechanical properties
Physical and mechanical properties are shown in Table 4.
Tensile strength/
(kN/40 mm)
Thermal stability/(%)
Ordinary type
High temperature type
Warp expansion
Weft contraction
Warp dynamic friction coefficient
Air permeability (pressure difference 0.735 kPa)/
Lcm/(cm2·min·kPa)]
5Testing method
Sample cutting
Width deviation/mm
Unit area mass deviation
Table 4 Physical and mechanical properties
. 0 ～~0. 5
≥1. 1×10
—1.0～0.5
Thickness deviation/mm
-1.5～0. 5
≥1. 1×10
Discard 200mm of the end of the sample strip, and prepare the rest of the sample strip according to the various tests. 2
≥0.9×10
≥0.9×103
5.2 Sample conditioning
BB/T 0022--2004
The sample should be placed in an environment of 23℃±1℃ and relative humidity of 50%±2% for more than 12 hours. And test under these conditions. 5.3 Appearance
Visual inspection under natural light or fluorescent light.
5.4 Dimensional deviation
Measure the length and width with a ruler, and measure five values at equal intervals, accurate to 1mm; in the longitudinal direction, use a thickness gauge with an accuracy of 0.01mm 1 to measure the thickness of five points at equal distances within the width range, a total of ten values, accurate to 0.1mm, calculate the arithmetic mean of the length, width and thickness, and then calculate the average deviation. 5.5 Unit area mass deviation
5.5.1 Sample preparation
Take three square samples with a length of 100mm±1mm and a width of 100mm±1mm at equal distances within the width range. The two samples on both sides should be 50mm away from the edge.
5.5.2 Weighing
Weigh the mass of the sample with a balance with a sensitivity of 0.01g, calculate the mass per unit area of the sample, accurate to 1g/m2, and take the arithmetic mean of the three samples.
5.5.3 Calculation
Calculate the deviation of unit area mass according to formula (1): Where:
T—deviation of unit area mass, %;
TM=M×100
Mi—average unit area mass of the sample, in grams per square meter (g/m2); M. -——nominal unit area mass of the sample, in grams per square meter (g/m2). The calculation result shall be accurate to 0.1%.
5.6 Air permeability
5.6.1 Preparation of samples
(1)
Cut three Φ50mm circular samples, make 80mm×80mm small bags with low-density polyethylene film with a thickness of not less than 50uμm, put the samples in plastic bags and seal them (the sealing should be tight and airtight, and the sealing temperature should be 100℃～120℃), and open Φ15mm air holes in the center of both sides of the plastic bags.
5.6.2 Test equipment
Bunsen roughness tester. Accessories: Two identical steel sheets with air holes in the center, with an outer diameter of 40mm and the same air hole diameter of 10mm. 5.6.3 Test steps
Clamp the sample between the two steel sheets and fix it on the instrument test head. The air holes of the sample and the air holes of the steel sheets should be aligned, and the axis of the air holes of the upper and lower steel sheets should be kept consistent. Press the test head, start the instrument, use the standard pressure adjustment code to adjust the pressure difference (P0.735kPa), block the air outlet of the sample with your finger, observe and make sure that the float of the flow meter can return to zero, release your finger, read the gas flow meter value after stabilization for 10s, and record the gas pressure difference on both sides of the sample.
5.6.4 Calculation
Calculate the air permeability of the sample according to formula (2):
1) The thickness gauge has a circular base and a cylindrical axial movable plane which is concentric with the base. The contact areas of the base and the movable plane are both 10cm2±0.2cm2. The pressure applied by the cylindrical movable plane is 20kPa±0.5kPa. 3
BB/T 0022—-2004
Wherein:
D—air permeability of the sample under a pressure difference of 0.735kPa, cubic centimeters per square centimeter per minute per kilopascal [cm2/(cm2·min·kPa)l,
Q—gas flow rate, in cubic centimeters per minute (cm/min); S—air permeability area of the sample, calculated as 0.785cm2 based on the diameter of the air hole of 10mm; P—gas pressure difference on both sides of the sample, 0.735kPa. Take the arithmetic mean of the three samples, accurate to 102cm2/cm2·min·kPa). 5.7 Tensile strength
Cut three specimens of 300mm in length and 40mm in width ±1mm in the warp and weft directions. Carry out tensile test on the tensile testing machine until the specimen is broken. The distance between the clamps is 200mm, and the loading speed is 100mm/min±5mm/min. Record the maximum tensile load when the specimen breaks, and directly express the tensile strength in kN/40mm. Take the arithmetic mean of the tensile strength test results in the warp and weft directions, and keep one decimal place in the result. 5.8 Thermal stability
5.8.1 Specimen preparation
Cut three specimens of 200mm in length and 60mm in width in the warp direction, draw markings with an interval of 100mm in the length direction, and measure the warp and weft dimensions with an accuracy of 0.1mm
5.8.2 Test steps
Install the specimen on a tensile testing machine with a temperature control box. At 180℃ (200℃ for high temperature type), keep the sample under a tension of 0.72kN for 10 minutes. Remove the sample and place it in a dryer to cool to room temperature, then measure the warp and weft dimensions, accurate to 0.1mm. 5.8.3 Calculation
Calculate the thermal shrinkage or thermal elongation according to formula (3): lo=×100
Where:
Thermal shrinkage or thermal elongation of the sample (positive sign for shrinkage, negative sign for extension), %; l Warp (weft) dimension before the test, in millimeters (mm) li—Warp (weft) dimension after the test, in millimeters (mm). Calculate the arithmetic mean of the three samples, and the result is accurate to 0.1%. 5.9 Determination of warp dynamic friction coefficient
According to the friction coefficient determination method in standard GB/T10006, use a friction coefficient tester for determination. 5.9.1 Sample preparationbzxz.net
. (3)
Cut three conveyor belt samples of 63mmX63mm, select 120g kraft paper, and cut three samples of 20cm×8cm. 5.9.2 Test steps
5.9.2.1 Fix the kraft paper with the smooth surface facing up on a horizontal test bench. Use double-sided tape to fix the bottom surface of the slider of the testing machine and the non-test surface of the sample. The longitudinal direction of the sample should be consistent with the sliding direction of the slider. Weigh the slider and the sample to an accuracy of 0.1g. 5.9.2.2 Place the slider with the sample fixed on the center of the sample surface of the test bench without impact, so that the test direction of the two samples is parallel to the sliding direction, and the force measurement system is just not subjected to force. Perform the test according to the instrument operating procedures, and record the tensile force curve when the sample slides 6cm on the kraft paper. The relatively flat curve except the first peak is the dynamic friction force curve of the sample. 5.9.3 Calculation
Calculate the dynamic friction coefficient according to formula (4):
Where:
μdynamic friction coefficient;
Fa——dynamic friction force, in Newton (N); (4)
F-—normal force, the total mass of the slider and the test piece, in Newton (N). Calculate the arithmetic mean of the dynamic friction coefficient and keep two decimal places. 6 Inspection rules
6.1 Factory inspection
BB/T 0022—2004
The factory inspection items are the items in 4.1. The inspection results of each product leaving the factory shall meet the requirements of 4.1. 6.2 Type inspection
6.2.1 Inspection items
All technical requirements in this standard. Type inspection shall be conducted in any of the following cases: a) when new or old products are transferred to another factory for production; b) when continuous production lasts for 6 months;
when changes in formula, production process or raw materials may affect product performance; c)
d) when production is resumed after a long period of suspension; when there is a large difference between the production inspection and the last type test inspection; e)
f) when the national quality supervision agency makes a request. 6.2.2 Batching and sampling
The conveyor belt is inspected in batches of finished products with the same materials, the same process and the same structure and packed in good condition. The maximum quantity of each batch is 10. One sample belt is randomly selected from each batch for inspection.
6.2.3 Judgment rules
6.2.3.1 Judgment of qualified items
If there are unqualified items in the appearance inspection results, double the number of samples should be sampled from the original batch for re-inspection. If all the re-inspections are qualified, the item is qualified, otherwise it is unqualified.
If any one of the specifications, dimensions and physical and mechanical properties is unqualified, the item is judged as unqualified. 6.2.3.2 Qualification batch assessment
If the inspection results of appearance, specifications, dimensions and physical and mechanical properties are all qualified, the batch is judged to be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
Each product should be attached with a label indicating the product name, specifications, unit area mass, manufacturer and effective use period. If there is an outer packaging, its marking should comply with the provisions of GB/T6388.
7.2 Packaging
The product is rolled into a simple shape and sealed in a moisture-proof plastic bag: The outer packaging should ensure that the product is not damaged or contaminated during transportation and storage, and is convenient for transportation and storage.
7.3 Transportation
During transportation, the product should be waterproof and moisture-proof to avoid damage and deformation. 7.4 Storage
The product should be stored in a clean, cool and dry warehouse, away from corrosive chemicals and other harmful substances. It should be at least 1m away from heat sources.1 Qualified Items Determination
If there are unqualified items in the appearance inspection results, double the number of samples should be taken from the original batch for re-inspection. If all the re-inspections are qualified, the item is qualified, otherwise it is unqualified.
If any of the specifications, dimensions and physical and mechanical properties are unqualified, the item is judged to be unqualified. 6.2.3.2 Qualified Batch Determination
If all the appearance, specifications, dimensions and physical and mechanical properties inspection results are qualified, the batch is judged to be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
Each product should be attached with a label indicating the product name, specifications, unit area mass, manufacturer and effective use period. If there is an outer packaging, its marking should comply with the provisions of GB/T6388.
7.2 Packaging
The product is rolled into a simple shape and sealed in a moisture-proof plastic bag: The outer packaging should ensure that the product is not damaged or contaminated during transportation and storage, and is easy to transport and store.
7.3 Transportation
During transportation, the product should be waterproof and moisture-proof to avoid damage and change. 7.4 Storage
The product should be stored in a clean, cool and dry warehouse and should not come into contact with corrosive chemicals and other harmful substances. It should be at least 1m away from heat sources.1 Qualified Items Determination
If there are unqualified items in the appearance inspection results, double the number of samples should be taken from the original batch for re-inspection. If all the re-inspections are qualified, the item is qualified, otherwise it is unqualified.
If any of the specifications, dimensions and physical and mechanical properties are unqualified, the item is judged to be unqualified. 6.2.3.2 Qualified Batch Determination
If all the appearance, specifications, dimensions and physical and mechanical properties inspection results are qualified, the batch is judged to be qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
Each product should be attached with a label indicating the product name, specifications, unit area mass, manufacturer and effective use period. If there is an outer packaging, its marking should comply with the provisions of GB/T6388.
7.2 Packaging
The product is rolled into a simple shape and sealed in a moisture-proof plastic bag: The outer packaging should ensure that the product is not damaged or contaminated during transportation and storage, and is easy to transport and store.
7.3 Transportation
During transportation, the product should be waterproof and moisture-proof to avoid damage and change. 7.4 Storage
The product should be stored in a clean, cool and dry warehouse and should not come into contact with corrosive chemicals and other harmful substances. It should be at least 1m away from heat sources.
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