ONE PART BLOCK MOULDING

Preparing the Mould
1- Model
2- Base
3- Frame
4- RTV (membrane thickness 20-50mm
according to the shape of the model
and RTV2 properties).

Processing the RTV
Prior degassing of the catalysed mixture enables air bubles to be eliminated. If degasing is not possible, it is recommended to apply a first coat to the model using a brush in the order to avoid the risk of bubbles on the surface. We can then proceed pouring to a slow trickle at the lowest point of the mould.

Demoulding
The demoulding time is variable as a
function of the choice of the product and the temperature. As a general rule, it is recommended to demould after 24 H at 25°C.

Reproduction of the Model
There is a large choice of reproduction
materials. As for RTV2's care must be taken concerning the risk of air bubbles, notably by pouring the materials slowly into the lowest part of the mould.

TWO PART BLOCK MOULDING

This operation is performed in two stages;
- Moulding the model up to the decided parting line
- After curing, casting of the remaining part
  Parts of the Mould
1- Plastiline base
2- Model
3- Parting Line
4- Dismantable frame
5- First vulcanized half
6- Positioning pins
7- Vents
8- Pouring hole

Mould Preparation (Part 1)
The mould is positioned in the plastiline up to the decided parting line then positioning pins are positioned. RTV is poured and left to cure. After turning the assembly the plastiline base is removed taking care not to move the model.

Mould Preparation (Part 2)
A thin coat of vaseline is applied to the first part of the silicone mould to avoid adhesion between the two parts. RTV is poured according to the recommended method for a one-part mould.

Reproducing the Model
Pouring holes and vents are made according to the models configuration then the same procedure is used as for a one-part mould.

INTRODUCTION

MOULDING TECHNIQUES

BLOCK MOULDING

SKIN MOULDING

BRUSH MOULDING