Esinye isizathu kukuba amandla asekuhlaleni okunyibilika ngokwawo aphantsi kakhulu, abangela ukuba amaqamza enze amaqamza avela ngaphandle;
Isizathu sesibini kukuba ngenxa yoxinzelelo oluphantsi olujikeleze ukunyibilika, amaqamza asekuhlaleni ayanda kwaye amandla awo ayancipha, enze amaqamza avela ngaphakathi ngaphandle. Kwimveliso yokuvelisa, akukho mahluko phantse phakathi kwale misebenzi mibini, kwaye kunokwenzeka ukuba ikhona ngaxeshanye. Uninzi lwamaqamza lubangelwa kukwandiswa okungalinganiyo kwamaqamu asekuhlaleni, okukhokelela ekuncipheni kwamandla anyibilikayo.
Isishwankathelo, ukuveliswa kwamaqamza kumaphepha eplastiki anogwebu kubandakanya le miba ilandelayo:
Ukuveliswa kwebhodi ye-foam ye-PVC ngokubanzi kwamkela abalawuli abathathu abahlukeneyo be-PVC: uhlobo lokufudumeza, uhlobo lwe-endothermic, okanye uhlobo lwe-endothermic kunye ne-exothermic composite equilibrium. Iqondo lobushushu lokubola lwePVC yokulawula ugwebu liphezulu, lifikelela kuma-232 ℃, ligqithise kakhulu iqondo lobushushu lePVC. Xa uyisebenzisa, iqondo lokushisa lokubola lifuna ukuthotywa. Ke ngoko, xa ulawula ukugwebulwa kwezixhobo zePVC, abalawuli bePVC abagwebu bakhethwa ngokubanzi. Olu hlobo lwesilawuli sogwebu lunesantya esiphezulu sogwebu, malunga ne-190-260ml / g, isantya sokubola ngokukhawuleza, kunye nokukhululwa okukhulu kobushushu. Nangona kunjalo, ixesha logwebu lifutshane kwaye isiquphe sinamandla. Ngoko ke, xa idosi ye-agent ye-PVC i-foam iphezulu kakhulu kwaye isizukulwana segesi sikhulu kakhulu, kuya kubangela ukuba uxinzelelo olungaphakathi kwi-bubble lunyuke ngokukhawuleza, ubukhulu bebhola bukhule kakhulu, kwaye igesi iya kukhutshwa ngokukhawuleza. kubangela umonakalo kwisakhiwo se-bubble, ukusabalalisa okungalinganiyo kobukhulu be-bubble, kunye nokusekwa kwesakhiwo seseli evulekileyo, eya kuvelisa amaqamza amakhulu kunye ne-voids ekuhlaleni. Xa kusenziwa iimveliso zeplastiki ezinogwebu, izilawuli eziphuma ugwebu ze-PVC akufanele zisetyenziswe zodwa, kodwa kufuneka zisetyenziswe kunye ne-endothermic foaming agents okanye zidityaniswe nobushushu kunye ne-exothermic elungeleleneyo elungeleleneyo edityanisiweyo ye-agent egwebu ugwebu. I-inorganic foaming agent - sodium bicarbonate (NaHCO3) yi-endothermic foaming agent. Nangona isantya sogwebu sisezantsi, ixesha logwebu lide. Xa ixutywe kunye nabalawuli be-PVC abanogwebu, inokudlala indima ehambelanayo kunye nokulinganisela. I-exothermic ye-PVC yogwebu i-agent iphucula isakhono sokuvelisa igesi ye-endothermic foaming agent, ngelixa i-endothermic PVC i-foaming regulator ipholisa yangaphambili, izinze ukubola kwayo, kwaye ilinganise ukukhutshwa kwegesi, inqanda ukuthotywa okutshisa kwangaphakathi kweepleyiti ezishinyeneyo, ukunciphisa imvula. iintsalela, kunye nesiphumo sokwenza mhlophe.
Kwisiseko sokungachaphazeli isantya sogwebu, kufanelekile ukongeza i-endothermic PVC egwebu izilawuli ukuze kuthathelwe indawo ezinye ii-exothermic arhente zogwebu, ukuze ucinezele ugqabhuko-dubulo olubangelwa ukongeza ii-exothermic arhente zogwebu.
Ixesha lokuposa: May-13-2024
