In all kinds of plastic, in addition to the aluminum foil reflective film and black and white and double-sided plastic composite membrane, the rest of the ordinary film of single layer film mulch and function. For reasons of cost reduction, membrane at home and abroad are moving in the direction of light-weight development, due to large users ability to under pressure in our country, the domestic film thickness is relatively thin abroad. River plastic product standards currently only film or the general standard and the standard form of biodegradable mulch in recent years, other specialized and functional film has not yet formed a unified standard specification, only in reference to the ordinary film standard to add some features on the basis of the project as a mulch products technical indicators. A 1984 GB 4455 the main indexes for agricultural use polyethylene blown film, film thickness thicker, in this standard is mainly suitable for rice seedlings film and shed film, GB 1375 a 1992 polyethylene blow molding agricultural mulching film, this standard applies to LDPE, LLDPE, LDPE/LLDPE, LDPE/LLDPE/HDPE as main resin, add a small amount of all kinds of additives, with blow molding processing and the formation of the PE film, strong commonality, this standard can be used in black and white and double PE film and other ordinary plastic film mulch and function. There are standard SG 369 a 1984 PE film (LDPE agricultural mulching film blowing) can be used as a reference. Soft PVC agricultural film blowing (QB 1257 a 1991), the main technical indicators are suitable for blow molding PVC film, films and other USES of agricultural film, PVC blowing film, PVC blowing film still SG81 you may refer to a 1975.
Aging resistant film with 70% more in China LLDPE (MI = 1 g / 10 min) and LDPE blend, adding 0.2% of composite light stabilizer containing hindered amine (uv absorbent and quenching agent), mulch 8 microns thick, the initial tensile force 1.3 N, use 2 months after tensile force fell to 50%, debris over 1 m length, can be QingChuXing > 80%, easy to recycle. With a plastic film aging evaluation of xenon lamp light exposure test method (GB 9344), plastic natural climate exposure test method and field exposure test rating evaluation method.
Weeding film release concentration of herbicides and release period has certain requirements, the right formula should ensure release concentration in damage crops under the limit, most of the time during the release release concentration above the weeding effective concentration. Adding type weeding film obviously easy to meet the above requirements, released from improve compatibility to extend the period considered, plastic materials to EVA, also after school is added in the PE modified PE as compatibilizer.
Non-ferrous multi-purpose PE mulch material, also have a small amount of PVC membrane. All kinds of pigment generally in the form of masterbatch to join. Black and white and double (double) membrane by co-extrusion composite blowing and note. Double color and white ribbon membrane composed of two extruder co-extrusion blow molding. Turn light membrane current production is not big, membrane materials are polyethylene; Turn light agent to join in the form of turn light agent masterbatch, turn light masterbatch dosage general < 5%.
