The hottest industry standard paper logs

Industry standard: log for paper making

national standard of the people's Republic of China

log for paper making GB

1 subject content and scope of application

1.1 this standard specifies the technical requirements, inspection methods and volume measurement of log for paper making

1.2 this standard is applicable to logs produced in the northeast and Inner Mongolia forest areas for the manufacture of various pulp and other wood fibers.

2 reference standard

gbl42 logs for direct use.

gb143.1 original tree species for conifer processing, main uses

gb143.2 log dimensions and tolerances for conifer processing

gb143.3 grading of logs for conifer processing

GB 4813.1 log species for hardwood processing Main uses

gb 4813.2 log dimensions and tolerances for broad-leaved tree processing

gb 4813.3 log grading for broad-leaved tree processing

gb l44.2 log inspection size inspection

people can't bear it; Standard low GB l44.3 log inspection grade evaluation

gb 4814 raw wood volume table

3 technical requirements

3.1 mechanical pulping method

applicable tree species, size and material requirements shall be implemented in accordance with the relevant provisions of gbl42, gbl43.1, gbl43.2, gbl43.3, gb4813.1, GB 4813.2 and gb4813.3

3.2 chemical pulping

nth= "12" year= "1899"> 3.2 minimum internal stress and warpage deformation 1 tree species

nth= "12" year= "1899"> 3.2.1.1 kraft pulping larch, Mongolian Scotch pine, Korean pine and other applicable tree species

nth= "12" year= "1899"> 3.2.1.2 sulfite pulping spruce, fir, poplar, etc

nth= "12" year= "1899"> 3.2.2 size

nth= "12" year= "1899"> 3.2.2.1 gauge length 2value= "6" unitname= "m">-6m. According to the production and transportation conditions, an appropriate number of lvalue= "1.8" unitname= "m">-1.8m short logs can be supplied

nth= "12" year= that means products are more low-carbon and environmentally friendly "1899"> 3.2.2 There is a certain toughness 2 gauge, which is more than 6cm from value= "6" unitname= "cm">6cm

nth= "12" year= "1899"> 3.2.3 dimension upgrading and tolerance

nth= "12" year= "1899"> 3.2.3.1 the length of the ruler is upgraded by value= ".2" unitname= "m">0.2m, but there is a level of value= "2.5" unitname= "m">2.5m

nth= "12" year= "1899"> 3.2.3.2 the caliper diameter is upgraded by 2 gal

nth= "12" year= "1899"> 3.2.3 long tolerance allows +6 value= "2" unitname= "cm">-2cm

nth= "12" year= "1899"> 3.2.4 material

nth= "12" year= "1899"> 3.2.4.1 material is not suitable for the provisions of gb142, but it is suitable for 6value= "16" unitname= "cm">-16cm small-diameter logs with the technical indicators listed in the table below

defect name

measurement method

limit

missing joint

within the whole length range

1

sapwood decay

thickness shall not exceed 10% of the diameter of the gauge

heartwood decay

area shall not exceed 25% of the sectional area of the diameter of the gauge

nth= "12" year= "1899"> 3.2.4.2 the material is not suitable for the provisions of gbl43.3 and GB 4813.3, and its ruler is the log with value= "18" unitname= "cm">18cm, This standard is applicable without any of the following conditions

a. rotten wood trapped in the mountain due to wind and disease

b. burnt wood with carbonized trunk

c. the inspection ruler is from the poplar tree species with value= "60" unitname= "cm">60cm and above, and the arch height of the good section is less than value= "12" unitname= "cm">12cm

3.3 thermomechanical pulp and chemical mechanical pulp method

applicable tree species, size and material requirements are the same as Article 3.2 of this standard

4 inspection method and volume measurement

4.1 size inspection shall be carried out in accordance with the relevant provisions of gb144.2

4.2 this standard 3 Article 1, nth= "12" year= "1899"> the material evaluation of article 3.2.4.1 shall be carried out in accordance with the relevant provisions of gb144.3

4.3 volume measurement shall be carried out in accordance with the relevant provisions of GB 4814