Some standard content:
BB/T0023--2004
Paper corner protectors for packaging are new packaging corner protection materials used to eliminate damage to the edges and corners of items during handling, storage and transportation. The product has the characteristics of hard surface, accurate molding, strong applicability, increased stacking strength, reduced packaging materials and labor to a certain extent, and cost saving.
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 Shanghai Ertete Packaging Technology Co., Ltd., Shanghai Hengfeng Paper Packaging Co., Ltd., and Tianjin Hengtong Honeycomb Packaging Products Co., Ltd. participated in the drafting. The main drafters of this standard are: Li Hua, Han Xueshan, Xu Weifeng, Yang Hushan, Shi Xing, Ji Shuang, Dai Minghua, Cao Fengying, and Liu Hongling. 1 Scope
Paper Corner Protectors
BB/T 0023—2004
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of L-shaped paper corner protectors for packaging.
This standard applies to the production, circulation, use and supervision inspection of high-strength rigid paper corner protectors made of paper and paperboard by extrusion molding for edge protection of packaging. 2 Normative References
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T191 Pictorial marking for packaging storage and transportation
GB/T2828.1 Sampling inspection procedure for counting Part 1: Sampling plan for batch inspection based on acceptance quality limit (AQL) GB/T450 Paper and paperboard sample collection
GB/T462 Determination of moisture content in paper and paperboard
GB/T4892 Rigid rectangular transport packaging size series GB/T10739 Standard atmosphere for handling and testing of pulp, paper and paperboard samples 3 Product classification
3.1 Classification of products according to their shape and side width
L-type paper corner protectors (code L) can be divided into two types: equilateral and unequal sides according to their side width. 3.2 Product specifications
The side width of paper corner protectors is recommended to be 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 70mm75 mm.80 mm.90 mm.100 mm.
The thickness of the paper corner protector is recommended to be 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 6.0mm, 7.0mm, 7.5 mm, 8.0 mm.
The length of the paper corner protector is recommended to be the size series specified in GB/T4892 or specified in the user's technical requirements.
Other specifications can also be determined by negotiation between the supply and demand parties. 3.3 Product model marking
3.3.1 Equilateral
The equilateral L-shaped paper corner protector is coded as L-××-××. L represents the L-shaped paper corner protector, the first group of ×× represents the side width (unit: mm): the second group of ×× represents the thickness (unit: mm). Example: L-50-4.5, indicating an equilateral L-shaped paper corner protector, with a side width of 50mm and a thickness of 4.5mm. 3.3.2 Unequal sides
The code for unequal side L-shaped paper corner protector is L-××-××-××. L represents L-shaped paper corner protector, the first group ×× represents the longer side width (unit: mm); the second group ×× represents the shorter side width (unit: mm); the third group XX represents the thickness (unit: mm). Example: L-40-25-3.5, represents unequal side L-shaped paper corner protector, the side widths are 40mm and 25mm respectively, and the thickness is 3.5mm. I
BB/T0023-2004
4.1 Appearance
The appearance color of paper corner protector should be white or brown, etc. The appearance color of paper corner protector should be white or brown, etc. It can be made of different surface paper such as tea board paper, kraft paper, white board paper, etc. according to customer requirements (if there are special requirements, it shall be agreed by both the supply and demand parties). The surface of the paper corner protector is smooth, flat and firm. The surface paper has no wrinkles, no glue penetration, no bubbles, no degumming, no cracks, no holes, no spots, no stains (oil stains, water stains, streaks, sticky marks), no warping, and no mechanical damage. There is no degumming in the cardboard stack. The adhesive surface of the cardboard should not separate when peeling. The cutting edges of the two ends of the paper corner protector are neat, smooth and flat, without obvious burrs, and perpendicular to each other. The width of the cut tear shall not exceed 2mm.
The surface of the paper corner protector should be flat, and the axial warping of a single paper corner protector per meter shall not exceed 15mm. The printed graphics and words are clear and uniform, firmly attached, without ink running, and without wild ink. 4.2 Dimension deviation
The external dimensions of the paper corner protector shall meet the requirements of Table 1 and Table 2. Table 1 Dimensions and deviations of L-type paper corner protectors
4.3 Angle
External angle 90°±3°.
4.4 Mass per meter
Nominal size/mm
25, 30, 35, 40, 45, 50, 55, 60, 70, 80, 90, 1001.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4. 0, 4.5, 5.0, 6. 0, 7.0, 7.5, 8. 0Table 2 Length deviation
Nominal size/mm
The mass per meter of paper corner protector shall not be less than that specified in Table 3. Table 3 Mass of paper corner protector per meter
Edge width/mmwww.bzxz.net
30×30
35×35
40×40
45×45
50×50
55×55
60×60
70×70
75×75
80×80
90×90
100×100
Thickness/mm
Deviation/mm
Deviation/mm
-0. 2~～+0. 4
Unit is gram per meter
4.5 Moisture content
The moisture content of factory paper corner protector is 12%±2%.
4.6 Physical and mechanical properties
For paper corner protectors with a thickness of 3mm or a side width of less than 30mm, no physical and mechanical properties requirements are imposed. 4.6.1 Longitudinal compression resistance
Longitudinal compression resistance shall not be lower than that specified in Table 4.
Longitudinal compression resistance of paper corner protectors
Side width/mm
4.6.2 Bending resistance
The bending resistance of paper corner protectors shall not be lower than that specified in Table 5. Edge width/mm
Test method
Pretreatment environment and test environment of the sample
Thickness/mm
Table 5 Bending resistance of paper corner protectors
Thickness/mm
BB/T0023--2004
Unit: Newton
Unit: Newton
Place the sample to be tested in an environment with a temperature of 23℃±2℃ and a relative humidity of 50%±5% for at least 72 hours in accordance with the provisions of GB/T10739.
5.2 Appearance
Visually inspect the sample at a distance of 300mm from the sample in an environment with sufficient natural light or under equivalent lighting conditions. 5.3 Dimensions
The dimensions of the paper corner protectors should be measured using appropriate general measuring tools under bright light. 3
BB/T 0023—2004
5.3.1 Paper corner protector edge width
Measure with a general measuring tool with an accuracy of not less than 0.1mm. The edge width measurement position is measured once at any interval of 100mm along the length direction, and a total of three points are measured, and the average value of the three times is taken. The edge width is accurate to 0.1mm. 5.3.2 Paper corner protector thickness
Measure with a vernier caliper with an accuracy of 0.02mm, and measure once at any interval of 100mm along the length direction, and a total of three points are measured, and the average value of the three times is taken. The thickness is accurate to 0.1mm. 5.3.3 Paper corner protector length
Measure with a general measuring tool such as a tape measure or steel ruler with an accuracy of 1mm. The length measurement position is at the top corner of the paper corner protector. Accurate to 1 mm.
5.4 Angle
Measure with a general protractor with an accuracy of 1° or a special test device. The angle measurement position is on the outside of the paper corner protector. Accurate to 1°. 5.5 Mass
Use a balance or electronic scale with an accuracy error of no more than 0.1g for weighing. 5.6 Moisture content
The moisture content test shall be carried out in accordance with the provisions of GB/T462. 5.6.1 Inspection instruments: a balance with a sensitivity of 0.001g, an aluminum box or a weighing bottle, a dryer, an oven that can be controlled at 105℃±2℃, and a rapid moisture meter.
5.6.2 Rapid moisture determination method: Use a rapid moisture meter to measure three points at different parts of each paper corner protector, and finally calculate the average value of the five samples.
When using a rapid moisture meter, the instrument should be calibrated in advance. When doubts or arbitration inspections occur, the moisture content is determined by the oven method.
5.6.3 Oven determination method: Weigh about 50g of sample (accurate to 0.001g) from different parts of each sample, make small pieces and place them in a weighing bottle (or aluminum box) of known mass, and bake them in an oven at 105℃±2℃ until constant weight. Each weighing should be accurate to 0.001g. 5.6.3.1 Test method
Accurately weigh and record the original mass of the sample, then dry the sample in a drying oven at a constant temperature of 105℃±2℃ until the mass of the sample is constant at a fixed value (that is, the difference between the two values measured at least 1h apart is less than 0.2% of the original sample mass), and then record the mass after drying.
The moisture content is calculated according to formula (1):
X = m=m2 ×100%
Where:
X—moisture content, %
m1—mass of the sample before drying, in grams (g); m2—mass of the sample after drying, in grams (g). The test result is accurate to 0.1%.
5.7 Longitudinal compression resistance
· (1)
Five specimens of 300 mm in length are cut from any part of the paper corner protector. The end face of the sample is smooth and flat, without wear, and perpendicular to the side.
Place the sample vertically in the center of the two flat plates of the compression tester. The movable plate compresses the sample at a rate of 10 mm/min±2 mm/min until it collapses, and record the maximum compressive strength at the time of collapse. Take the average value of the five samples. 5.8 Bending test
Take five specimens of 300mm length from any part of the paper corner protector. Place the specimen on a bending test stand with a spacing of 200mm. In the middle, use a loading head with a side length of 120mm at 90°, a contact surface width of 4
BB/T0023—2004
18mm, and a mass of 2kg. The loading head is placed in the middle of the specimen. The loading head applies force to the sample at a rate of about 100mm/min±10mm/min, and the maximum value at the time of crushing is recorded. As shown in Figure 1. Take the average value of the five samples. - Loading head,
Specimen,
Stand,
4——Flat plate.
Figure 1 Schematic diagram of bending test stand
Inspection rules
The inspection of paper corner protectors is divided into factory inspection and type inspection. Paper corner protector manufacturers should ensure that the paper corner protectors they produce comply with the provisions of this standard and be inspected by relevant inspection departments in accordance with this standard.
6.1 Factory inspection
6.1.1 Inspection items: Appearance and size.
6.1.2 Batch: The number of products of the same specification shall not exceed 5,000 pieces per batch. Sampling: GB/T2828.1 is adopted, AQL is 4.0, general inspection level I, and the normal inspection sampling plan is shown in Table 6.6.1.3
501~1200
1201~3200
3200~~5000
6.2 Type inspection
6.2.1 Inspection items: All inspection items specified in the technical requirements. 6.2.2 Type inspection should be carried out in the following cases: A
After formal production, if there are major changes in the process and raw materials, which may affect the product performance; a)
In normal production, it should be carried out every six months; c)
When the product is stopped for more than three months and then resumed, as required by the contract;
When the national quality supervision, inspection and quarantine agency proposes a type inspection requirement. 6.2.3 Sampling and judgment rules:
BB/T0023--2004
6.2.3.1 Dimensions and appearance: Randomly select 20 samples from the products that have passed the factory inspection. If five or more samples are unqualified, the batch is unqualified.
6.2.3.2 Physical and mechanical properties: Randomly select five samples from the 20 samples as a group of samples. If all samples are qualified, the batch is qualified. If there are unqualified items, double sampling should be taken from the original batch for retesting. If there are unqualified items, the batch is unqualified. 7 Packaging, marking, transportation and storage
7.1 The packaging method and requirements of paper corner protectors shall be agreed upon by the supply and demand parties. The packaging of paper corner protectors shall be firm, flat and suitable for transportation. The outer packaging shall be marked with obvious sun protection, fire protection, moisture protection and operation direction signs according to the requirements of GB/T191. 7.2 Each package (box, bundle) of products shall have a qualified stamp, and each batch of products shall be marked with the manufacturer's name, product name, trademark, product specification or model, production date or production batch number, and inspector's stamp.
7.3 The transportation of paper corner protectors shall avoid direct rain, exposure to the sun, moisture and pollution, and shall not adopt transportation and loading and unloading methods that damage the product. Fireworks shall be strictly prohibited during transportation and storage, and heavy pressure shall not be allowed. Prevent rain, snow and water. 7.4 When storing, it should be stored in a clean, cool, ventilated, dry warehouse without flammable items, avoid high temperature and sunlight, and the height of the bottom floor from the ground should be no less than 150mm. When storing in the open air for a short period of time, good protective measures such as bitterness and padding must be taken. 7.5 The storage period of the product is generally not more than 18 months.3 Sampling and judgment rules:
BB/T0023--2004
6.2.3.1 Size and appearance: Randomly select 20 samples from the qualified products of the factory inspection. If there are five or more unqualified samples, the batch is unqualified.
6.2.3.2 Physical and mechanical properties: Randomly select five samples from the 20 samples as a group of samples. If all are qualified, the batch is qualified. If there are unqualified items, double sampling should be re-tested from the original batch. If there are unqualified items, the batch is unqualified. 7 Packaging, marking, transportation and storage
7.1 The packaging method and requirements of paper corner protectors shall be agreed upon by the supply and demand parties. The packaging of paper corner protectors should be firm, flat and suitable for transportation. The outer packaging should be marked with obvious sun protection, fire protection, moisture protection and operation direction signs according to the requirements of GB/T191. 7.2 Each package (box, bundle) of products should have a qualified stamp, and each batch of products should be marked with the manufacturer's name, product name, trademark, product specifications or model, production date or production batch number, and inspector's stamp.
7.3 The transportation of paper corner protectors should avoid direct rain, exposure to the sun, moisture and pollution, and transportation and loading and unloading methods that damage the product should not be used. Fireworks are strictly prohibited during transportation and storage, and heavy pressure is not allowed. Prevent rain, snow and water. 7.4 When storing, it should be stored in a clean, cool, ventilated, dry warehouse without flammable items, avoid high temperature and sunlight, and the height of the bottom floor from the ground should be not less than 150mm. When stored in the open air for a short period of time, good protective measures such as bitterness and padding must be taken. 7.5 The storage period of the product out of the factory is generally not more than 18 months. to3 Sampling and judgment rules:
BB/T0023--2004
6.2.3.1 Size and appearance: Randomly select 20 samples from the qualified products of the factory inspection. If there are five or more unqualified samples, the batch is unqualified.
6.2.3.2 Physical and mechanical properties: Randomly select five samples from the 20 samples as a group of samples. If all are qualified, the batch is qualified. If there are unqualified items, double sampling should be re-tested from the original batch. If there are unqualified items, the batch is unqualified. 7 Packaging, marking, transportation and storage
7.1 The packaging method and requirements of paper corner protectors shall be agreed upon by the supply and demand parties. The packaging of paper corner protectors should be firm, flat and suitable for transportation. The outer packaging should be marked with obvious sun protection, fire protection, moisture protection and operation direction signs according to the requirements of GB/T191. 7.2 Each package (box, bundle) of products should have a qualified stamp, and each batch of products should be marked with the manufacturer's name, product name, trademark, product specifications or model, production date or production batch number, and inspector's stamp.
7.3 The transportation of paper corner protectors should avoid direct rain, exposure to the sun, moisture and pollution, and transportation and loading and unloading methods that damage the product should not be used. Fireworks are strictly prohibited during transportation and storage, and heavy pressure is not allowed. Prevent rain, snow and water. 7.4 When storing, it should be stored in a clean, cool, ventilated, dry warehouse without flammable items, avoid high temperature and sunlight, and the height of the bottom floor from the ground should be not less than 150mm. When stored in the open air for a short period of time, good protective measures such as bitterness and padding must be taken. 7.5 The storage period of the product out of the factory is generally not more than 18 months. to
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