Cuddon Limited - Freeze Dry Technology Manufacturers, Manufacturing and General Engineers

Cuddon Limited - Freeze Dry Technology Manufacturers, Manufacturing and General Engineers

Four steps are used to carry out the basic freeze drying principles by sublimation of ice in a vacuum. Although each product demands different handling techniques, the four conditions are necessary and must be met in the following order.

1) The product must be solidly frozen below its eutectic point.

2) A condensing surface of low temperature must be provided.

3) The system must be capable of evacuation to low pressures in a reasonable time.

4) A controlled source of heat input to the product must be employed to drive the water from the solid to the vapour state.

Freeze drying equipment is designed to create a controlled set of conditions which maintain the optimum temperature pressure difference for a given product and thereby allowing the transfer of moisture in an efficient manner.

The model BL10 configuration has the ice vapour condenser located in a totally separate vessel beneath the product chamber, with design considerations allowing an efficient transfer of vapour, and allowing isolation of the ice condenser should it be necessary to defrost during a product cycle.