The use of pesticides depends not only on the appropriate period of prevention and treatment, but also on the number and severity of diseases and pests. Then, when a pest occurs, how to measure whether it has reached the prevention and treatment standards? This is a relatively complicated problem and should be considered from a variety of factors, such as plant varieties and their tolerance to pests and diseases, types of pesticides, methods of control, control effects and economic benefits. Therefore, to correctly formulate prevention and control standards, we should master several basic principles.
(1) Economically cost-effective. That is to say, the use of smaller control costs can greatly reduce the economic losses caused by pests. If the occurrence of pests and diseases is very light, it is estimated that the economic losses caused by it are not large. If the application of pesticides increases the production cost, it is not worthwhile. It is not necessary to use pesticide control at this time.
(2) Look at the number of pests, that is, the density of insects. For example, cotton bollworm, cotton seedlings with 100-30 eggs per 100 plants should be chemically controlled; as for sorghum, more than 50 eggs per acre should be applied universally, 50 or less should be selected for prevention, or per acre. More than 30 of the dry heart group should be treated with the rule of law, and 30 or less should be selected for prevention and treatment.
(3) Consider the effects of natural enemies and other environments on pests and diseases, and protect and utilize natural enemies. For example, the amount of brown rice blast in rice fields is relatively large, and it should have been applied. However, if there are many natural enemy spiders at this time, the ratio of the number of spider mites to the number of locusts can reach 1:8-9, so it is not necessary to apply the medicine. In short, the standards for disease and insect control should be flexibly controlled in production according to actual conditions.
Sanding Belt Converting Line
1.Abrasive Roll Slitter-Would slit coated abrasive from wide rolls into narrower rolls.
2.Abrasive Cut to Length Machine-To cut down certain length of abrasive material from abrasive rolls
3.Sanding Belt Skiving Machine-to make the abrasive belt joint processing
4.Joint Press Machine-To make the sanding belt joint firmly joint together after it`s applied glue & splicing tapes
5.Belt Slitter-slit wide sanding belt into narrow ones
6.Tensile Strength Test Machine-To test joint strength For each kind of converting machines, we have several models.
The roll slitter machine type is designed to cut rolls of abrasive paper and cloth and to rewind them with grain both inside and outside.
This is a high-performance machine which is suitable for the continuous process of heavy jumbos.Slitting machine is a high-precision, high-sensitivity slitting equipment. The rewinding and unwinding uses an air shaft, and the tension is controlled by a magnetic powder clutch. The unwinding correction adopts ultrasonic automatic correction control, which can realize automatic detection, automatic correction, and automatic meter counting. The slitting is accurate, the slitting speed is fast, and the operation and maintenance are convenient.
Slitting machine is suitable for slitting and rewinding of roll paper, non-woven fabrics, melt blown fabrics, hot-air cotton, films (PET, PE, PI), stickers, labels and other materials.
This machine is mainly for small belt slitting, with fix knife sets, precise slitting. Need to change knife sets when slit different size of sanding belt. 3 sizes available.
We distributes and wholesales various brands of Bonded Abrasives, Abrasive Sanding Disc, Cutting Wheels , Flap Wheels , Flap Disc Backing Pad, Flap Disc Adhesive , and Surface Conditioning Product etc, and enjoy a high position among consumers.
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Zhengzhou Jiading Abrasive Manufacturing Co.,Ltd , https://www.jiadingabrasive.com