the most widely used machine for precision sowing of cucumber and sorghum seeds is vacuum type. the performance and distribution accuracy of the vacuum type metering unit is of great importance. therefore, the experiments at three pressures of 25, 35, 45 mbar and two level of forward speed 3 to 4.5 km/h and 6 to 8.5 km/h were conducted and multiple planting, feeding quality and miss planting we...

Abstract We investigated the industrial applicability of multifunctional flame-retardant epoxy gelcoats based on flame retardants containing phosphorus (P), in particular ammonium polyphosphate (APP, which acts solid phase), resorcinol bis(diphenyl phosphate) (RDP, mainly gas phase) and their combination. It was possible to apply most formulations via spraying with use a diluent, while RDP were...

The compaction behavior of dry reinforcements has been the subject of much previous research work. However the research was mainly carried out for the Resin Transfer Molding (RTM) process where the compaction pressure goes up to 1 MPa, and higher compaction rates are involved. In the vacuum infusion molding process, the available compaction pressure never exceeds 1 bar. Accordingly, the analyti...

Issues pertaining to deforestation, environmental pollution and natural wastes are increasing day by day. These issues can be resolved introducing a new composite material, in which waste is used as fibre replacement of wood plastic composite. The different lengths (3, 6 9 cm) corn husk filled polyester composites were produced using the vacuum infusion method. Several mechanical properties the...

Vacuum assisted resin transfer moulding (VARTM) is a promising manufacture process for making large and complex fiber reinforced composite structures. However, the complexity of the flow of the resin in the infusion stage usually leads to nonuniform property distribution of the produced composite part. In order to control the flow of the resin, the situation of flow should be mastered. For the ...