Ram Press

Saint-Gobain Formula's plasters ensure a high level of mould life and permeability to improve productivity

A ceramic body with high plasticity is shaped by exterting pressure, using two halves of a mould made of very hard plaster, embedded with a porous network of porous non-metallic flexible tubes/air hose.
Our global expertise allows Saint-Gobain Formula to confidently provide technical support on mould making (please see best practice section).

Benefits

Improved mould life: more than 1000 pieces can be pressed
Ram press moulds are formulated plaster to ensure best mechanical properties and required permeability to evacuate excess water
Specific controlled and limited plaster setting expansion of every ram press product

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Best practice

Plaster preparation specificities: installing porous air hose

Galvanised Gird: to hold the air horse
Air hose diameter: 5 to 6 mm
Air hose position distance from the shape: 25mm to 30 mm
Air hose position distance between 2 lines: 25mm
Air hose position distance from the edge: 30 mm minimum
Air blowing input: from the centre to the edge

Specificity of plaster mixing

Controlled slip temperature
Mechanical mixing: mixing time from 5 to 10 min
Compressed air activation:
- Push the thermometer into the plaster to a 2cm depth
- The compressed air circuit should be connected (manometer set to 0) during the minute following the end of setting (measured with Durometer Shore A = 40), this correspond to a rise of 5°C in temperature

New technology

Ceramic Tableware Manufacture - Ramp Press

Saint-Gobain Formula supplies plaster solutions for the manufacture of ceramic tableware. We have a dedicated range of plasters suitable for Ramp Press technology ensuring maximum mould life

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