This part of GB/T 19599 specifies the determination of the measured weight of nets and the net gauge. This part is applicable to the determination of the net weight of fishing nets. GB/T 19599.1-2004 Test method for synthetic fiber fishing nets Net weight GB/T19599.1-2004 Standard download decompression password: www.bzxz.net

ICS65.150
National Standard of the People's Republic of China
GB/T19599.1--2004
Testiag method for fishing nets of synthetic fibre.Weight of netting
Promulgated on November 9, 2004
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on March 1, 2005
GB/T 19599.1—2004
GB/T19599&Test method for synthetic fibre fishing nets" has the following standards: GB/T19599.1—2004 Test method for synthetic fibre fishing nets GB/T19599.2-2004&Test method for synthetic fibre nets This part is Part 1 of GB/T19599. This part is revised on the basis of SC/T 5016.2-1988 Fishing Nets, which is automatically repealed. Net Weight》
Measuring Methods of Net Weight》. Appendix A of the Japanese standard implemented from this part is a normative appendix, and Appendix B is an informative appendix. This part is proposed by the Fisheries Bureau of the Ministry of Agriculture.
This part is under the jurisdiction of the Technical Committee on Fishing Gear and Fishing Gear Materials of the National Technical Committee for Fishery Standardization (TC156/SC4). Drafting unit of this part: East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences. The main drafters of this part are Shi Jiangao and Rong Xiufang. 1 Scope
Test methods for synthetic fiber fishing nets
Weight of nets
This part of GB/T19599 specifies the determination of the measured weight of nets and the net gauge. This part is applicable to the determination of the weight of nets of fishing nets. 2 Normative references
GE/T 19599.1—2004
The following documents are incorporated into this part of GB/T 1959 by reference in this part. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to investigate whether the latest versions of these documents can be used. For undated references, the latest versions are applicable to this part.
SC/T5001 Basic terms of fishing gear materials
3 Terms and definitions
The following terms and definitions apply to this part of GB/T 19599. 3.1
Actual weight (G,) actual weighl
The weight actually measured under certain temperature and humidity conditions. [SC/T 5001--1995, definition chapter 27 3.2
Normal weight (G,) conditioned weight
The weight of fiber materials and their products converted according to the official moisture regain. [SC/T5001-1995, definition chapter 28] 3.3
Official moisture regain (W,) Convention moisture regain is the moisture regain specified for fiber materials and their products for trade and inspection requirements (--generally formulated with reference to the standard moisture regain). [SC/T 5001.. 1993, definition 20.2-3.4
Actual moisture regain (W) actual regain
The moisture regain actually measured under certain temperature and humidity conditions. [SC/T50011995, definition 20.3]
4 Test items
a) Measured weight of mesh G,i
b) Mesh male mouse G.
5 Test instruments
Use metric scales and calibrated instruments that conform to the legal measurement unit system, with an accuracy of not less than ±1% of the range and a graduation value less than 1% of the measured weight of the mesh.
GB/T 19599.1—2004
Test methods
6. 1 Measured weight of mesh (G.)
6.1.1 When measuring the weight of the mesh, the overflow and humidity at that time must be recorded. 6.1.2 Weigh each piece of mesh once with a metric scale, in dry grams, accurate to three significant figures. 6.2 Mesh weight (G,)
6.2.1 Determine the measured moisture regain of the mesh according to Appendix A. 6,2.2 The mesh weight is calculated according to formula (1), accurate to three significant figures. 100 -W.
Where:
G,—mesh weight, unit is gram (kg); G—---measured weight of the mesh, unit is kilogram (kg); W—mesh common moisture regain (see Table 1), %; W,--measured moisture regain of the mesh, %.
1 Commonly used synthetic fiber residue mesh moisture regain products
Official moisture regain/(%)
Polyethylene mesh
Vinylene meshbZxz.net
Nylon mesh
Polyester mesh
A, 1 Test instrument
A.1.1 Oven hygrometer.
A, 1.2 Balance, sensitivity is 0.01 area
A.2 Sampling
Appendix A
(Normative Appendix)
Actual residual moisture regain W of mesh. Determination of
GB/T 19599.1—2004
After the actual weight of each sample is measured, a sample of about 50 grams is cut from the central part of the folded or rolled sample: Under the conditions agreed by both the supply and demand parties, the sample can be prepared according to the method specified in Appendix B. A, 3 Test steps
A.3.1 The oven hygrometer is preheated to a drying temperature of 105℃±5℃. A.3.2 After the sample is cut, its mass is weighed quickly. A.3.3 After the sample is placed in the preheated oven hygrometer, the timing begins. After drying for 1 hour, the weighing begins. Thereafter, the sample is weighed every 0.51, and the difference in mass between the two consecutive weighings does not exceed 0.1% of the mass of the latter one. The last amount is the dry medium 3gA.3.4 The sample mass is weighed accurately to 0.01%. A, annual test results and discussion
The measured moisture regain of the mesh is calculated according to formula (A.1), and the arithmetic mean of three times is taken, accurate to two decimal places. W, = zna
ng ×100+\
W. The measured moisture regain of the mesh, %
The mass of the sample before drying, in grams (g) tms
The mass of the sample after drying, in grams (). Tnig
GB/T 19599.1—2004
(Informative engraving)
Preparation of the sample for measured moisture regain
Take about 50g of the fishing net line with the same material and specifications as the mesh sample or the sample with the same specifications as the sample made by shrinking the fishing net line, and put it into the central part of the folded or rolled sample. After 24 hours, it will be! Naturally, the mesh sample with actual moisture regain is obtained. Note: After the sample prepared according to the above method is taken out from the mesh sample, the actual weight of the sample and the moisture regain of the prepared sample should be measured according to 6.1.
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