Recommended Post Harvest Temperatures
0ºC (32ºF) and 90% – 95% relative humidity.Packaging Method
The first important step is to quickly pre-cool grapes following harvest. The permeability of PEAKfresh carton liners has proved to be very successful in providing adequate volumes of oxygen in order to set up the correct atmosphere to generate moisture and to activate Grape Guard Pads (sulfur dioxide) for long term storage. Grape Guard Pads are designed to release an initial burst of sulfur dioxide and a slow release of additional sulfur dioxide over a period of eight to 12 weeks storage. The pads generate sulfur dioxide as a result of moisture take up and if moisture is excessive as a result of packing warm grapes or a break in refrigeration, then the amount of sulfur dioxide generated will be excessive and will taint the grape berries. By using PEAKfresh carton liners and correct refrigeration, Grape Guard Pads will operate efficiently over extended storage periods.
The correct procedure for using Grape Guard Pads and PEAKfresh liners is to place a moisture absorbent sheet at the bottom of the PEAKfresh carton liner, place grapes on top of the moisture absorbent sheet, place a further moisture absorbent sheet across the top of the grapes and then the Grape Guard Pad. The PEAKfresh carton liner should then be folded closed prior to sealing of the box. Careful handling of the packaged grapes is essential to avoid berry damage. Length of storage varies between the varieties of grapes; however hardy varieties can be stored up to 36 weeks with adequate refrigeration.
0ºC (32ºF) and 90% – 95% humidity.
Important Please Read
All recommendations for the use of PEAKfresh products are given in good faith and based on proven field experience. Packaging method storage temperatures and humidity levels, transit and destination conditions are factors likely to affect the performance of PEAKfresh products and no liability for indirect or consequential damage can be accepted. We recommend that PEAKfresh products be trialed under local conditions before introduction to large scale commercial applications.