Effect of Infrared Surface Heating Combined with Freezing Treatment on Automatic Peeling of Grapes

Abstract:

To achieve rapid and efficient peeling of frozen grapes, the effects of infrared surface heating pretreatment combined with freezing on automatic peeling of grapes with different treated duration were explored. Two methods including infrared surface heating before freezing and infrared surface heating after freezing were applied in this study. The results showed that the infrared surface heating treatment for more than 5 minutes before freezing could cause obvious cracking of the grape peel, and the automatic peeling effect was obvious. However, the long-term infrared processing caused the decrease of grape hardness, color and other indicators. The short-term infrared treatment after freezing could better maintain the grape quality. The grapes were cracked without thawing could be ensured by 1 minute of infrared surface heating, therefore various methods could be used to automatically peel the grapes in the subsequent steps.