Let's talk about how to judge the quality of food vacuum freeze dryer
Iffriżar-ikel imnixxef huwa tip ta 'ikel magħmul mill-iffriżar malajr ta' ikel frisk (bħal ħaxix, laħam, prodotti akkwatiċi, mediċina tradizzjonali Ċiniża, eċċ.) u mbagħad jintbagħtu f'kontenitur vakwu għas-sublimazzjoni u d-deidrazzjoni. L-ikel magħmul mill-proċess tat-tnixxif bil-friża-mhux biss iżomm il-kulur, l-aroma, it-togħma, u l-għamla tal-ikel, iżda wkoll jippreserva l-vitamini, il-proteini, u nutrijenti oħra fl-ikel. Qabel ma jittiekel l-ikel imnixxef bil-friża-, sakemm jiżdied bl-ilma, l-ikel jerġa 'lura għall-ikel frisk fi żmien ftit minuti. Il-ħażna ta' ikel imnixxef bil-friża-m'għandux bżonn tagħmir ta' refriġerazzjoni. Sakemm ikun issiġillat u ppakkjat, jista 'jinħażen, jinġarr u jinbiegħ f'temperatura tal-kamra għal żmien twil. L-ikel imnixxef bil-friża-maħżun mhux se jiddeterjora fi żmien tlieta jew ħames snin. Minħabba l-kwalità tajba tagħha u ħfief (kontenut ta 'ilma ta' 5 fil-mija biss), l-ispejjeż operattivi tagħha jistgħu jitnaqqsu ħafna.
Konfigurazzjoni tas-sistema tal-egżost tal-freeze dryer tal-vakwu tal-ikel:
The working vacuum of the drying bin, especially at the initial stage of sublimation and dehydration, is an important process parameter for producing qualified dry products. Whether the working vacuum degree can reach the target completely depends on whether the configuration of the vacuum exhaust system is reasonable. From the long-term development history of lyophilizers, there are two configuration modes of the vacuum exhaust system in principle: ① water vapor refrigeration plus mechanical vacuum pump; ② Steam jet pump. At present, some advanced lyophilizers at home and abroad choose the former method, and the latter method has long been eliminated abroad. The fundamental reasons for the elimination of steam jet pump are: ① the vacuum it can achieve is low and the work is unstable, so it is difficult to ensure that the drying bin can obtain the ideal working vacuum, so it is also difficult to ensure the production of qualified dry products; ② It consumes a lot of steam and water, but it doesn't save energy.
The dehydration cycle of the food vacuum freeze dryer and the output of dried products are closely related to each other. If the cycle is short, the output will be high. We can't generally say whether the dehydration cycle of a lyophilizer is long or short, because the cycle is related to many factors, such as material variety, pretreatment form, loading amount, heating plate temperature, vacuum degree, and so on. The technical performance of the lyophilizer depends not only on the material heating mode, heating plate heating mode, refrigeration cooling mode, and vacuum unit configuration mode but also on the technical indexes such as heating plate temperature, water vapor refrigeration temperature, air leakage rate of the drying bin and vacuum degree of the drying bin (the time when the air is pumped to 130pa).
