Key Technology of Plastic Support Net for Underground Coal Mine

Classifications of plastic support net for underground coal mine

At present, the classifications of plastic support net for underground coal mine are not too much and they are generally divided by material and purpose.

KTP-01: The development direction of plastic support net in underground mine is replacing steel with plastic.

KTP-02: Plastic support net for underground coal mine are generally divided by material and purpose.

According to the material, it can be divided into three types: metal, non-metallic and composite type. Among them, the metal net has metal diamond-shaped net, spot welding flat mesh, spot welding roll net, expanded metal net and metal braid net; non-metallic net has fence tablets (usually woven with bamboo chips, now only used by a few southern coal mines), plastic packing belt net, bidirectional stretching plastic net and plastic woven top cloth; composite net has steel plastic composite mesh and metal coated plastic net.

The metal net is a traditional type of supporting network, it can be used in any project under the coal mine, with no need for safety standard. Thus, the national security center has only classified the use of polymer nonmetal net and composite net and divide them into top net and protective support net. The users generally believe that the top net can replace the protective support net, but not vice verse. However, this classification is not based on the strength of plastic support net, but determined by the enterprise declaration. For example, one enterprise taking PE as raw material produce plastic support nets whose tensile strength is 30 kN/m and it can declare both top network and protective support net, The top net models are marked JDPE30MS and the protective support net models are marked HBPE30MS. Even if plastic support net with tensile strength exceeding 30kN/m can also declare protective support net. That is what should be noticed by the relevant department and the users should pay attention to it. The general direction of the development of plastic support net in underground mine is "replacing steel with plastic".

Key technology of plastic support net for underground coal mine

The upstream of plastic support net for underground coal mine is the production of plastic raw materials and additives in chemical industry, as well as the research and development of new high polymer materials and breakthrough of plastic modification theory. The midstream is the production of support net. It should be improved according to the condition of coal mine use and the support technology of roadway, introduces new methods and techniques constantly, design and produce products that meet the requirements. The downstream is application and test. Research and develop high-strength, high safety, easy processing, energy-saving, environmental protection and energy-saving technology of plastic support net for underground coal mine is the only way to make new type plastic support net for underground coal mine towards more practical and moving toward the industrialization of coal mine market. It is also the link between the industry and the market.