Extrusion coating compound resin & extruder
DATE：2019/5/5 8:37:40 / READ： / SOURCE：This station
Extrusion coating compound resin
The extrusion coating composite resin may be LDPE, MDPE, HDPE, LLDPE, EVA, PP, Surlyn, Nucler, Bynel, EVAL, EEA, EAA, EMA, EMAM, hot melt adhesive or the like. The purpose of extrusion coating is different, and the resin chosen is different. For example, in order to make the paper have good gloss or matte property and have good heat sealability and moldability and is applied to paper, LDPE can be used, and the coating thickness is 30-70 um, and it is applied at 150-350 g/ M2 paper can be used for paper cup and carton forming; for ordinary laminated plastic bag, it can be used for various heat sealing resins with good heat sealing property; for resin for sandwich extrusion The same layer and inner sealing layer plastic layer have good compatibility, according to the surface layer and the inner sealing layer
Different choices of materials. A variety of compatibilizing agent greases, such as Surlyn, Nucler, Bynel, Primacor, etc. When using LDPE extrusion flow compounding, the MI of LDPE is 4-7 g/10 min. Compared with sandwich extrusion (( Sandwich), it can be free of slip agent. When it is squeezed as inner seal layer, it should be squeezed at 320 °C first. Apply a layer of LDPE, and then squeeze the coating at about 180 °C. The LDPE resistant to high temperature at 320 °C has serious oxidation and good thermal adhesion, but the heat sealing property is poor. The LDPE extruded at 180C has good heat sealability. The thermal adhesion is not good. If you want to squeeze the PA. With LDPE, you can use Surlyn, because Surlyn has good compatibility with PA and LDPE. However, when laminating BOPA with PP, you should use Nucler. Because Surlyn has no compatibility with PP, it can't be bonded together, and Nucle has PA, good phase with FP.
Extrusion coating compound extruder
The main equipment of the extrusion coating machine is a T-die extruder. The extruder consists of a simple machine and a screw. The 4 to 6-stage heater is used outside the barrel. Generally, cast aluminum heaters are used. The heating resistance wire and the infrared light heating material are simultaneously casted in a block heating element by using aluminum alloy, which can well protect the heating element from oxidative degradation in the air and shorten the service life, and only need to install the cast aluminum heater to the extrusion. Just outside the machine barrel. In order to facilitate the cooling and control, the 4~6 heating section outside the machine is also equipped with a blower. When the temperature exceeds the set value, the blower automatically turns on the blast cooling while turning off the heater. When the temperature is too low, the heater switch is automatically turned on to perform heating while stopping the blower rotation to maintain a constant temperature. The temperature control mode can be a two-way control mode, a time proportional control mode, and a continuous ratio.
Examples of control methods, composite control methods, PI control methods, or PID control methods. The choice of control method should be considered according to the accuracy, economy and easy maintenance of maintenance. In general, in order to improve the wear resistance of the barrel, nitrided steel can be used. In the case where the processing corrosion is particularly large and the mechanical equipment is required to have particularly good corrosion resistance, a high-grade alloy steel combining elements such as nickel, cobalt, chromium, and molybdenum should be used as the extruder in the village. The extruder screw has a difference between a mutant screw (so-called nylon screw) and a tapered screw (so-called gauge screw). Recently, due to the diversification of extrusion-coated composite resins, there have been many applications for progressive-type screws that can accommodate various resins.
The extrusion coating composite resin may be LDPE, MDPE, HDPE, LLDPE, EVA, PP, Surlyn, Nucler, Bynel, EVAL, EEA, EAA, EMA, EMAM, hot melt adhesive or the like. The purpose of extrusion coating is different, and the resin chosen is different. For example, in order to make the paper have good gloss or matte property and have good heat sealability and moldability and is applied to paper, LDPE can be used, and the coating thickness is 30-70 um, and it is applied at 150-350 g/ M2 paper can be used for paper cup and carton forming; for ordinary laminated plastic bag, it can be used for various heat sealing resins with good heat sealing property; for resin for sandwich extrusion The same layer and inner sealing layer plastic layer have good compatibility, according to the surface layer and the inner sealing layer
Different choices of materials. A variety of compatibilizing agent greases, such as Surlyn, Nucler, Bynel, Primacor, etc. When using LDPE extrusion flow compounding, the MI of LDPE is 4-7 g/10 min. Compared with sandwich extrusion (( Sandwich), it can be free of slip agent. When it is squeezed as inner seal layer, it should be squeezed at 320 °C first. Apply a layer of LDPE, and then squeeze the coating at about 180 °C. The LDPE resistant to high temperature at 320 °C has serious oxidation and good thermal adhesion, but the heat sealing property is poor. The LDPE extruded at 180C has good heat sealability. The thermal adhesion is not good. If you want to squeeze the PA. With LDPE, you can use Surlyn, because Surlyn has good compatibility with PA and LDPE. However, when laminating BOPA with PP, you should use Nucler. Because Surlyn has no compatibility with PP, it can't be bonded together, and Nucle has PA, good phase with FP.
Extrusion coating compound extruder
The main equipment of the extrusion coating machine is a T-die extruder. The extruder consists of a simple machine and a screw. The 4 to 6-stage heater is used outside the barrel. Generally, cast aluminum heaters are used. The heating resistance wire and the infrared light heating material are simultaneously casted in a block heating element by using aluminum alloy, which can well protect the heating element from oxidative degradation in the air and shorten the service life, and only need to install the cast aluminum heater to the extrusion. Just outside the machine barrel. In order to facilitate the cooling and control, the 4~6 heating section outside the machine is also equipped with a blower. When the temperature exceeds the set value, the blower automatically turns on the blast cooling while turning off the heater. When the temperature is too low, the heater switch is automatically turned on to perform heating while stopping the blower rotation to maintain a constant temperature. The temperature control mode can be a two-way control mode, a time proportional control mode, and a continuous ratio.
Examples of control methods, composite control methods, PI control methods, or PID control methods. The choice of control method should be considered according to the accuracy, economy and easy maintenance of maintenance. In general, in order to improve the wear resistance of the barrel, nitrided steel can be used. In the case where the processing corrosion is particularly large and the mechanical equipment is required to have particularly good corrosion resistance, a high-grade alloy steel combining elements such as nickel, cobalt, chromium, and molybdenum should be used as the extruder in the village. The extruder screw has a difference between a mutant screw (so-called nylon screw) and a tapered screw (so-called gauge screw). Recently, due to the diversification of extrusion-coated composite resins, there have been many applications for progressive-type screws that can accommodate various resins.
Author：admin