Portion Size and Food Thickness

Thickness is one of the biggest drivers of freeze drying time. Thick pieces contain more water and create longer paths for vapor to escape. Thin, uniform pieces dry faster and more evenly. A common target for many foods is about one-quarter to one-half inch thickness. Uneven thickness causes uneven results. Thin pieces finish early while thick pieces may still be wet inside. For meals, spread food thin rather than piling it. For fruits and vegetables, slice evenly. Good portion control improves consistency and makes cycle times predictable.