Vacuum leakage ka nneɛma a mfiridwuma mu freeze dryers taa di huammɔ kɛse no ho. Ɛbɛkanyan nsunsuansoɔ bɔne a nea ɛka ho ne ahoɔden a wɔde di dwuma kɛseɛ, drying cycles a ɛkyɛ ne product a ɛhwe ase. Static pressure‐hold test ne ɔkwan a ɛyɛ adwuma sen biara a wɔfa so hwɛ leak‐check ma pre‐shipment inspection ne da biara da plant‐site patrol, a ebetumi asusuw leakage level nyinaa a enni leak detectors titiriw a ne bo yɛ den.
Adwumayɛ nhyehyɛe a edi mũ: bere a wɔaboaboa ano koraa anaasɛ wɔasiesie wɔ batch akyi no, to dan pon mu denneennen. Fi ase vacuum pumps na twe chamber no kɔ fam na fa w’ani si vacuum a etwa to no so. Sɛ wudu vacuum bo a wɔahyɛ ato hɔ akyi a, to vacuum pumps nyinaa mu na to vacuum valves mu na ama vacuum units no atew koraa. Fi ase bere na kyerɛw pressure‐rise value wɔ chamber mu wɔ bere a wɔahyɛ ato hɔ mu.
Gye a wogye tom no gu ahorow ma unit ahorow a ɛsono ne kɛse. General reference for food‐grade industrial freeze dryers: wɔ dan mu hyew tebea mu, bere a wɔayi vacuum kuw no afi afoforo ho akyi no, nhyɛso‐kɔ soro Nea ennu anaasɛ ɛne 15Pa yɛ pɛ wɔ simma 30 mu no kyerɛ sɛ ɛyɛ adwuma yiye; 15‐40Pa nhyɛso‐kɔ soro hwe ase wɔ baabi a wogye tom; nhyɛso‐kɔ soro boro 40Pa kyerɛ sɛ ɛda adi sɛ nsuo a ɛretu na ɛsɛ sɛ wɔyɛ nsuo a ɛretu no mu nhwehwɛmu.
Fa w’adwene si mmeae a ɛtaa tu fa so: 1 chamber‐door silicone sealing strip ne sealing contact surface, hwɛ sɛ nneɛma a asɛe, nsensanee, onyin & mpaapaemu; 2 gaskets a ɛwɔ flange joint biara mu; 3 vacuum paipu nkitahodi ahorow; 4 nsɔano nkaa a ɛwɔ vacuum valves mu; 5 hwɛ mfɛnsere ne sensor mounting hyɛn gyinabea wɔ chamber fasu.
Afotu: Nnyɛ pressure‐hold test wɔ hot chamber so wɔ production run akyi pɛɛ. Twɛn kosi sɛ dan no bɛdwo koraa akodu dan mu hyew mu, efisɛ ɔhyew a ɛtrɛw ne nea ɛtwetwe no bɛkyinkyim nhyɛso akenkan. Kwati sɔhwɛ wɔ mframa a ano yɛ den anaa ambient‐temperature fluctuation a ɛyɛ nnam a ɛtwetwe sɔhwɛ aba no ase.
Pressure‐hold test betumi abu atɛn sɛ ebia leakage nyinaa wɔ hɔ, nanso entumi nkyerɛ leak‐position pɔtee. Sɛ nhyɛso‐kura mu aba no di nkogu a, fa spray‐leak‐detection tom na woahu mmeae pɔtee bi a ɛwɔ leak‐points. San yɛ pressure‐hold sɔhwɛ bere a woasiesie awie no de si index a ɛfata so dua. Nhyɛso‐kura patrol a wɔyɛ daa no boa ma wohu onyin‐asiane a ahintaw a ɛwɔ nneɛma a wɔde siesie nneɛma mu no ansa na wɔayɛ na esiw mpofirim a ɛpaapae bere a wɔreyɛ no ano.
