This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of the absorbent measuring instrument. This standard applies to the production acceptance and quality assessment of the absorbent measuring instrument (hereinafter referred to as the measuring instrument). The periodic technical status inspection of the measuring instrument during use should also be used as a reference. QB/T 1668-1992 Absorbent Measuring Instrument QB/T1668-1992 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
Cobb absorbency tester
This standard adopts the relevant provisions of the international standard ISO535 "Paper and paperboard".
1 Subject content and scope of application
Determination of water absorption-
QB/T 1668-1992
Cobb (cobb) method" Chapter 6 "Instrument"
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of cobb absorbency tester.
This standard is applicable to the production acceptance and quality assessment of cobb absorbency tester (hereinafter referred to as the tester), and the periodic technical status inspection of the tester during use should also be used as a reference.
2 Reference standards
GB/T1540 Determination of water absorption of paper and paperboard (Cobber method) GB/T14253 General technical conditions for light industrial machinery 3 Product classification
Product specifications and models are shown in Table 1.
Measurement area
ZZ-100
Inner diameter of absorption cylinder
Note: The technical indicators of other similar instruments must comply with the provisions of this standard. 4 Technical requirements
4.1 Environmental conditions for normal operation of the measuring instrument: room temperature 20±10℃;www.bzxz.net
Place on a solid and stable workbench with a flat surface; b.
No vibration.
4.2 The pressure roller of the measuring instrument should comply with The following provisions shall be met: a.
The shape is cylindrical, the length is 200±0.5mm; the mass is 10±0.5kg.
4.3 The test surface of the tester sample placement plate shall be flat and smooth. 4.4 The measuring area of ​​the tester is 100±0.2cm2. 4.5 The water absorption mechanism of the tester shall meet the following provisions: convenient water injection and drainage, flexible turning, accurate and firm positioning; a.
Approved by the Ministry of Light Industry of the People's Republic of China on January 15, 1993T
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Implemented on September 1, 1993
The volume of the absorption cylinder shall be greater than 100ml;
QB/T 1668—1992
c. Sealing: Turn over and invert the absorption cylinder filled with 100ml of distilled water. After 1 minute, there should be no water leakage between the absorption cylinder and its cover. 4.6 Appearance quality of the measuring instrument
4.6.1 The appearance of the machined parts should comply with the relevant provisions of GB/T14253. 4.6.2 The surface of the painted parts should comply with the relevant provisions of GB/T14253. 4.6.3 The plating layer of the electroplated parts is firm, without defects such as burns, chrome thorns, and plating shedding. 4.6.4 The surface oxide layer of the smoked parts is uniform, the color is consistent, and there is no unoxidized area. 4 .7 The assembly of the various components of the measuring instrument shall comply with the relevant provisions of GB/T14253. 5 Test method
5.1 The test shall be carried out under the conditions specified in 4.1 of this standard. 5.2 Inspection of roller parameters in 4.2 of this standard
5.2.1 Inspection standard tools and instruments
a. Vernier caliper with a graduation value of 0.05mm;
b. Industrial balance of grade 6 or above.
5.2.2 Inspection method
Measure the roller length with a vernier caliper, and the reading shall be accurate to two decimal places. The length value shall be 200±0.5mm. Weigh the roller mass with an industrial balance, and the reading shall also be accurate to two decimal places. The mass value shall be 10±0.5kg. 5.3 Inspection of measurement area in 4.4 of this standard
5.3.1 Inspection standard vernier caliper with a graduation value of 0.02mm. 5.3.2 Inspection method The area is measured by measuring the inner diameter of the absorption cylinder and calculating the measured area for indirect inspection. The inner diameter D (mm) of the absorption cylinder is measured with a vernier caliper and the reading is accurate to two decimal places. The inner diameter value should be 112.8 ± 0.2 mm. The measurement area is calculated by formula (1):
Where: S——-measurement area, cm;
D-inner diameter of the absorption cylinder, mm.
5.4 Inspection of the volume of the absorption cylinder in 4.5b of this standard S 10nD
5.4.1 Inspection of the depth vernier with a graduation value of 0.02 mm. (1)
5.4.2 Inspection method The volume of the absorption cylinder is measured by measuring the depth of the absorption cylinder and calculating the volume of the absorption cylinder for indirect inspection. The depth H (mm) of the absorption cylinder is measured with a depth vernier caliper and the reading is accurate to two decimal places. Calculate the volume of the absorption cylinder using formula (2):
Where: V-volume of the absorption cylinder, mL;
S——inner opening area of ​​the absorption cylinder (measurement area) cm\;Hdepth of the absorption cylinder, mm.
5.5 4.5c of this standard Test of the sealing of the water absorption mechanism 5.5.1 Test standard electronic stopwatch.
(2)
5.5.2 Test method Inject 100 mL of distilled water at 20±1°C into the absorption cylinder, press the cylinder cover tightly, turn the absorption cylinder to the locked position, turn the absorption cylinder upside down, and start the electronic stopwatch. After 1 minute, turn over the water absorption mechanism to reset the absorption cylinder and stop the timing. At this time, there should be no water seepage at the joint between the absorption cylinder and the cylinder cover. 5.6 4.3, 4.5a, 4.6~4.7 of this standard shall be tested or visually inspected as required. 238
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6 Inspection Rules
QB/T 1668—1992
6.1 The factory inspection of the measuring instrument shall be fully inspected according to the provisions of this standard. 6.2 The main measurable performance indicators of the measuring instrument must all meet the requirements of this standard. Minor defects of non-measurable general performance are allowed to be returned for repair to meet the requirements.
6.3 Before the measuring instrument is packed into the warehouse, it is necessary to conduct random inspection and re-inspection. The re-inspection rules are as follows: a.
The re-inspection adopts stratified random sampling;
b. The number of qualified judgments for re-inspection is zero
The re-inspection sample is 10% of the inspection batch. When the batch is less than 20 units, the sample should be no less than 3 units. When the batch is less than 10 units, the sample should be no less than 2 units. The decimal place of the calculated value of the number of sampling units is rounded up to an integer; the sample is inspected item by item according to the requirements of this standard. If unqualified products or serious defects appear in the sample, a second extended sampling will be carried out, and the extended ratio is 20% of the inspection batch (excluding the first sampling). If defects appear again in the second sampling, the entire batch should be rejected. 6.4 The measured data of the main items of the factory inspection of the measuring instrument should be recorded in the random documents. Products without documents proving the quality of the products cannot be shipped.
7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 Product marking
The measuring instrument should be marked with a plate made of copper or aluminum. The content of the plate includes: a.
Manufacturer name;
Product name;
Product model or mark;
Main parameters of the product;
Manufacturing date, number or production batch number.
Packaging Marks
The product packaging box should have text and symbolic marks on the surface, including: a.
Product name;
Manufacturer name;
Shipment and delivery marks and the year and month of production;
Box number;
Precision instrument, moisture-proof, sun-proof, upright direction symbols; e.
f. Gross weight.
7.2 Packaging
7.2.1 The outer packaging material of the measuring instrument is solid and dry wood. The thickness of the bottom plate of the box should be no less than 20mm, the thickness of the side plate and the top cover plate should be no less than 15mm, and the surface of the box plate must be smooth. The main unit of the measuring instrument should be fixed on the bottom plate of the box, and the accessories should be installed in the same box. The outer packaging box plate should be a pressed edge staggered joint, the inner wall of the box should be paved with moisture-proof linoleum, and the main unit and accessories should be covered with plastic film protective covers. 7.2.2
7.2.3 After the outer packaging is sealed, angle irons should be nailed to the four corners of the reinforced box. The angle irons can be bent with iron plates with a thickness of not less than 1mm. The random technical documents of the measuring instrument should be placed in a plastic bag and fixed to the upper part of the inner wall of the box. The random technical documents include: 7.2. 4
Product certificate:
Product instruction manual;
List of random accessories and spare parts;
Packing list;
Unpacking instructions.
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7.3 Transportation
—1992
QB/T1668
The measuring instrument can be transported in any way in the packaged state. It should be strictly prevented from falling, moisture, inversion and sideways during transportation. 7.4 Storage
7.4.1 Storage place
Storage period
Additional instructions:
A dry, ventilated warehouse at room temperature.
Three months. After three months, the package should be unpacked for random inspection. This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by Changchun Paper Testing Machine Factory and Sichuan Changjiang Papermaking Instrument Factory. The main drafters of this standard are Jiang Yansheng and Lv Huiqing. 240
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