Resin transfer moulding machine (RTM) is applied for manufacture of parts where tighter tolerances, both side finish along with voidless construction of material is required. This moulding process makes use of closed mould system.
For manufacture of parts the two halves of the mould are first applied with release agent and uniform gel-coat layer and then laid up with special glass mat known as CFM or core mat.
The two halves of mould are then closed with toggle clamps and vacuum applied to the mould with inbuilt vacuum minder. Resin apg molding machine is then forced into it with the help of a quick, semi-automated process. Once the requisite amount of resin is injected the mould is left for curing of the part for 30-45 minutes.
The advantages of a ‘closed mould’ process are considerable but include the following:
Volatile emissions (styrene etc) are massively reduced
It can be a fast, clean and repeatable process
The laminate thickness can be closely controlled
The process is far less reliant on the manual skills of the operator
The‘B’surface of the moulding can be accurately defined
The process can be automated
Benefits of resin transfer molding machine:
Requires minimum labourMinimum wastageComplete defense against air entering into the partsControlled and uniform thicknessHigher stiffness to weight ratio
Industries Using These Resin Dispensing Machine Processes:
At NTF we use resin transfer molding machine epoxy resin apg machine technology to develop superior quality and durable products. In the production process we useThermo set Reinforced as the raw material to produce:
Hard TopsSpinnersDoors for TrainRoof (AC)PanelsCover - army boxesDash BoardsConsoles
Dry reinforcement (glass, carbon, aramid etc) is placed between a two-part mould and the mould is clamped shut using mechanical force (hydraulic press, nuts/bolts, heavy duty toggle clamps etc).
The mould flanges compress a peripheral seal which prevents resin leaks from the mould and may also be vacuum-tight.
Thermosetting resin is injected, often centrally, directly into the fibre-pack, and the mould is filled by positive hydraulic pressure from the injection machine. The mould is normally vented at the furthest points from the injection point allowing the air to escape. Vacuum epoxy resin pressure gel molding machine can also be drawn from the vents to improve laminate quality when necessary.
Traditional epoxy resin apg molding machine relies on the mould/clamping structure being stiff enough to withstand the pressure of the injected resin without opening or distorting. This aspect of the process can become problematic if large scale components are moulded, with tooling sometimes becoming uneconomic simply due to its mass and handling/clamping requirements.