This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of headboxes for Fourdrinier papermaking machines (hereinafter referred to as headboxes). This standard applies to open headboxes and air cushion headboxes. QB/T 1422.1-1991 Technical conditions for headboxes of common components of papermaking machinery QB/T1422.1-1991 Standard download decompression password: www.bzxz.net

Light Industry Standard of the People's Republic of China
General Parts of Papermaking Machinery
Technical Conditions for Headbox
1 Subject Content and Scope of Application
QB/T 1422. 1--1991
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of headboxes for Fourdrinier papermaking machines (hereinafter referred to as headboxes).
This standard applies to open headboxes and air cushion headboxes. 2 Reference standards
GB191 Pictorial marking for packaging, storage and transportation
GB/T451.2 Determination of the basis weight of paper and paperboardGB/T1031 Surface roughness parameters and their valuesGB/T6388 Shipping and receiving markings for transport packaging
JB/T8 Product labels
QB/T842 General technical conditions for light industrial machinery weighing instruments3 Technical requirements
3.1 Basic requirements
3.1.1 The headbox shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 3.1.2 The manufacture of the headbox shall comply with the provisions of QB/T842. 3.2 Performance requirementswwW.bzxz.Net
3.2.1 The headbox must meet the requirements of the paper machine's rated speed. 3.2.2 The paper cross-section basis weight difference caused by the headbox shall not exceed 5%. 3.3 Processing quality
3.3.1 The surface roughness R of the inner wall of the headbox shall not be greater than 1.6μm. 3.3.2 The surface roughness R of the homogenizing roller shall not be greater than 1.6m. 3.3.3 The roughness R of the inner hole, inclined hole and chamfer of the orifice plate shall not be greater than 1.6μm. 3.3.4 The lip roughness R of the upper and lower lip plates shall not be greater than 1.6μm. 3.3.5 The straightness tolerance of the lip of the lower lip plate is 0.10mm/m. 3.3.6 The inner wall of the pulp distributor of the headbox should be smooth and there should be no possibility of pulp hanging. 3.4 Assembly quality
3.4.1 After the pulping roller is assembled, the roller body is rotated, and the gap between the roller surface and the bottom and wall of the box body shall not be less than 1.5mm. 3.4.2 All moving and rotating parts should be flexible and no blocking is allowed. 3.5 Appearance requirements
3.5.1 The appearance surface should be smooth and clean, and the outer edges of the joints of adjacent parts should not have obvious deviations. 3.5.2 The exposed accessories, matching parts and headbox should be harmoniously coordinated and beautiful. 3.5.3 The painting of the outer surface of the headbox should be in accordance with the provisions of QB/T842.7 when the user has no special requirements. Approved by the Ministry of Light Industry of the People's Republic of China on December 31, 19918
Implementation on August 1, 1992
4 Test methods
QB/T1422.1—1991
4.1 The cross-section quantitative difference shall be tested in accordance with the provisions of GB/T451.2. 4.2 The surface roughness shall be checked by sample comparison or profilometer. 5 Inspection rules
5.1 Each product shall be inspected and qualified by the manufacturer before it can be shipped out of the factory, and the documents proving the product's qualification shall be attached when it leaves the factory. 5.2 Headbox inspection is divided into factory inspection and type inspection. 5.2.1 Factory inspection
Processing quality inspection shall comply with the provisions of Article 3.3; assembly quality inspection shall comply with the provisions of Article 3.4; appearance inspection shall comply with the provisions of Article 3.5. 5.2.2 Type inspection
Type inspection shall be carried out during the trial production and appraisal of new products or when the national quality supervision agency makes a request. Type inspection is carried out at the user's factory and the paper machine at the same time, and its performance requirements shall comply with the requirements of Article 3.2. 6 Marking, packaging, transportation, storage
When the headbox leaves the factory alone, a product label shall be fixed in an obvious position. The label type and size shall comply with the provisions of JB/T8. The label shall indicate the following contents:
Product name;
Model,
Net paper width,
Lip width;
Working speed,
Weight;
Factory number;
Factory date;
Manufacturer name.
6.2When the headbox leaves the factory as a separate product, the accompanying documents include: Certificate of Conformity;
Product Instructions;
Packing list.
6.3The packaging, transportation, storage, etc. of the headbox shall comply with the relevant provisions of QB/T842.8. 6.4 The graphic signs for product hoisting, receiving and delivering, storage and transportation shall comply with the provisions of GB/T6388 and GB191. Additional remarks:
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 Shanghai Paper Machinery General Factory.
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