This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of filter paper. This standard applies to filter paper used as a gasket or cushion for stamping filters for oil filters in automobiles, tractors, etc. QB/T 1712-1993 Filter Paper QB/T1712-1993 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Filter Element Paper
1 Subject Content and Scope of Application
QB/T 1712
—1993
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of filter element paperboard. This standard applies to filter element paperboard used as gaskets or gaskets for stamping filters for oil filters in automobiles, tractors, etc. 2 Reference standards
GB/T450 Paper and paperboard sampling
GB/T 451.1
Determination of size and skewness of paper and paperboardGB/T 451.2
GB/T 451.3
GB/T 453
GB/T 462
Determination of basis weight of paper and paperboard
Determination of thickness of paper and paperboard
Determination of tensile strength of paper and paperboard (constant rate loading method)Determination of moisture content of paper and paperboard
Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)GB/T 2828
GB/T 10342
GB/T 10739
3 Product classification
Paper packaging and marking
Standard atmosphere for handling and testing of pulp, paper and paperboard samples 3.1 Filter cardboard is divided into thin filter cardboard and thick filter cardboard. 3.1.1 Thin filter cardboard is used as filter disc in filter. 3.1.2 Thick filter cardboard is used as the support for filter disc in filter. 3.2 Filter cardboard is flat cardboard.
4 Technical requirements
4.1 The technical indicators of filter cardboard must meet the requirements of Table 1. Table 1
Indicator Name
Tensile Strength
Delivery Moisture
Vertical and Transverse
Average Value
Not More Than
Not Less Than
Thin Filter Cardboard
0.6±0.05
Thick Filter Cardboard
3.0±0.25
4.2 Cardboard size: 1350mm×920mm, size deviation shall not exceed ±10.0mm, skewness shall not exceed 10.0mm; 1150mm×880mm, size deviation shall not exceed ±5.0mm, skewness shall not exceed 5.0mm, or other specifications specified in the order contract Approved by the Ministry of Light Industry of the People's Republic of China on April 15, 1993 342
Implementation on December 1, 1993
QB/T 1712---1993
4.3 The paperboard should be calendered, with a smooth surface and uniform thickness. 4.4 There should be no delamination when the paperboard is cut. 4.5 The cut edges of the paperboard should be neat and clean, and there should be no paper defects such as indentation, folds, wrinkles, tears, bulges, warping, and undissociated fiber bundles on the surface. Paperboard with the above minor paper defects but with a usable area of ​​more than 90% can be classified as second-class products. The number of second-class products in each batch of paperboard shall not exceed 15%.
4.6 The thickness, size, grade, etc. of the paperboard should be specified in the order contract. 5 Test methods
5.1 Size: measured in accordance with GB/T451.1. 5.2 Quantity: measured in accordance with GB/T451.2. 5.3 Thickness: measured in accordance with GB/T451.3. 5.4 Tensile strength: measured in accordance with GB/T453. 5.5 Moisture content: Determined in accordance with GB/T462. 6 Inspection rules
6.1 One batch is considered as one delivery.
6.2 The manufacturer shall ensure that the paperboard produced meets the requirements of this standard, and a product quality certificate shall be attached to each piece of paper delivered. 6.3 Product delivery sampling inspection shall be carried out in accordance with GB/T2828, and the sample unit is piece. 6.4 Delivery sampling plan, inspection level, and qualified quality level (AQL) shall be as specified in Table 2. Table 2
Sampling plan
Batch, piece
151～3200
Normal inspection Secondary sampling plan Inspection level S-3 Class B nonconforming products
Sample sizebZxz.net
Class C nonconforming products
AQL = 6. 5
Nonconforming classification
Class B nonconforming
6.5 The sampling of samples shall be carried out in accordance with the provisions of GB/T450, and the pre-inspection treatment of samples shall be carried out in accordance with the provisions of GB/T10739. Class C nonconforming
Tensile strength
Delivery moisture
Appearance quality
6.6 The purchaser has the right to accept the goods according to this standard. If there is any objection to the quality of the batch, the supplier shall be notified within three months after the arrival of the goods for joint re-inspection. If it does not meet the requirements of this standard, it shall be judged as a batch nonconforming and the supplier shall be responsible for handling it; if it meets the requirements of this standard, the purchaser shall be responsible for handling it. 7 Marking, packaging, transportation, storage
7.1 The packaging and marking of paperboard shall be carried out in accordance with the provisions of GB/T10342, and the following supplements shall be made. 7.1.1 The net weight of a paperboard piece is 250kg, or the number of pieces agreed with the user. 7.1.2 Paperboards of different brands, thicknesses, sizes and grades shall be packaged separately. 7.2 Paperboards shall be properly stored to prevent the influence of wind, rain, snow and ground moisture. 7.3 A canopy and clean transportation vehicle shall be used for transportation. 7.4 Paper pieces shall not be thrown down from a height.
Additional remarks:
QB/T1712-1993
This standard was proposed by the Paper Industry Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Paper Standardization Center. This standard was drafted by Liaoyang Industrial Paperboard Factory. The main drafters of this standard are Li Xixiang, Rongde, Zhang Jialiang, Li Lanfen and Liu Shu. From the date of implementation of this standard, the former Light Industry Ministry Standard QB135-1973 "Filter Element Paperboard" will be invalid.
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