generally regarding the Palm dates processing line, we will follow the process, washing---> pre-cooking--> pulping and destoning--> juice storage--> juice mesh filter--> juice membrane filter( or maybe there will be another filter stage needed)--> evaporting or concentrating -->pasteurizing--filling.
Date syrup can be considered one of the most innovative and attractive by-products in date processing. Especially in the Middle East and in the North African countries, date syrup is used as a substitute for honey or other similar sweeteners, as well as in confectionary and drinks. Bertuzzi date processing machinery is designed for producing syrup either from fresh or dried dates. In the soaking tanks, equipped with stirrer and outfeed screw, the dates are re-hydrated.
Depending on the required capacity, the de-soaked dates are sent either to our stoning machine SuperCreamer or JumboCreamer, guaranteeing a clean separation of stones from pulp and syrup.
Before the product is filtered, we pasteurize it in our plate heat exchanger ThermoFlash. The unit is manufactured in several sizes and can be mounted on skid. The date syrup is clarified by vacuum rotating filters with Kieselguhr pre-coat. As alternative to the vacuum filter ultrafiltration can be used.
Optionally, syrup can be concentrated. Our three effects plate evaporator Flashterm is suitable to concentrate date syrup from 18 to 72° Brix.
Date syrup can be sterilizied or pasteurized depending by the specific request of the application by a sterilizer/pasteurizer plate sterilizer/pasteurizer.
Once sterilized the product can be filled in aseptic bag in drums or in box
Jujube juice extracting system
The jujube extracting process is the core processing in the jujube juice and syrup prcessing line,it mainly includes two steps:hot water extrction and adding enzyme preparation for enzymolysys.The jujube juice yield rate is 55%-60% with these two methods applied.
Hot water extraction: This process is carried out in the SUS304 extraction tank,the jujube pulp and 70°C hot water ratio are 1:3 in the extraction tank,the PH is adjusted to 6.0±0.2,then start the stir to blending for 2 hours.After heating the slurry was filtered through a vibrate screen filter to remove large impurities and insoluble matters.
Enzmatic hydrolysis:Pectinase and cellulose enzyme preparations were added at the rate of 1% for each on a date pulp weight basis in the enzymatic hydrolysis tank.The mixture of date pulp,water and enzyme preparations are mixed carefully and incubated at 50±2°C for 2 hours with a continuous blending.The date juice extraction system results in a main product(date juice)and a by-product(presscake).Crude juice contains soluble and insoluble solids as well as foreign matter.
Date juice clarification system
Several technologies have been employed for clarification of date juice,such as juice pretreatment by boiling,precipitating or hydrolyzing colloids by enzyme,removing insoluble foreign matters by means of filtration or centrifugation,decolorrization using activated carboon or ion exchange,removing the minerals using chemicals or ion exchange,and removing high molecular weight compounds by foaming.The mature technology is that the jujube juice is first filtered through a plate and frame filter,and then use the ultrafiltation system to filter it twice,so that we get a clarified jujube palm juice.
Jujube syrup concentration system
After refining and filtration,jujube juice with soluble solid content of 20-25% will be obtained,which needs to be concentrated.The most common soluble solid content of jujube syrup is 75%.The falling film evaporator is applied to cocentrated the date juice to jujube syrup.
Jujube syrup filling machine
The jujube syrup after concentration,then cooled down to 30°C,and filling into the bottles or metal cans.As the syrup does not pasteurize,to extend the shelf life,the vacuum filling machine is suggested.