一,Cell structure chungchangah hian .
1.Cell structure inang lo (a lian leh te inmil lo, co-bubble)
Product cut surface hian cell lian tak tak leh cell te tak te dense tak tak a lantir a, distribution inang lo tak tak a awm a, hei hian hand feel leh compression rebound a nghawng a ni.
A chhan tam tak avanga lo awm a ni:
1)Uneven mixing: Hei hi a chhan bulpui ber a ni. Foaming agent leh vulcanizing agent te chu rubber compound-ah hian a inhmeh tawk lo a, chu chuan hmun thenkhatah chuan foaming agent concentration a sang lutuk a, bubble lian tak tak a siam bawk.
2)Improper plasticity of the rubber compound: Rubber compound hi a khauh lutuk (plasticity a hniam), a fluidity a tha lo a, bubble a lo thang lian leh a lo zau zel theihna a lian hle a, hei hian cell lian leh te chi hrang hrang siam a awlsam hle. Rubber compound a nem lutuk chuan bubble walls chakna chu a tling tawk lo ang a, an inzawm khawm duh hle bawk ang.
3)Vulcanization leh foaming speed inkara thil dik lo: Foaming speed chu vulcanization speed aiin a tam chuan bubble te chu an lo thang lian a, an inzawm khawm theih nan hun an nei tling a, chu chuan inthlau tak a thlen thin. Vulcanization speed chu foaming speed aiin a sang zawk chuan rubber compound chu a hun hmain a set a, bubble te chu a lo thang lian vek thei lo va, chu chuan foaming tha lo leh density sang tak a thlen thin.
Loading method dik lo: Rubber compound chu mold cavity-ah hmun dik lo takah dah a ni a, chu chuan flow path a rei lutuk a, a flow laiin gas a pung khawm a ni.
2. Foaming rate tling lo emaw, a tam lutuk emaw (density out of control) .
Phenomenon: Product density hi design value atanga inthlak danglam a ni a, a rit lutuk emaw a rit lutuk a, a nem lutuk emaw a, a chakna hian standard a tlin lo.
A chhan tam tak avanga lo awm a ni:
1)Foaming agent hman dan dik lo: weighing dik lo emaw foaming agent ngei pawh a hlawk lo tawh.
2)Improper Process Parameters: Temperature: Mold temperature a hniam lutuk a, foaming agent a chhe lutuk pawh a tawk lo; Mold temperature a san lutuk chuan foaming agent chu instant chhungin nasa takin a decompose ang a, chu chuan gas a chhuah tir thei a, rubber compound atang chuan a ti chhe thei bawk.
3) Pressure: Forming pressure a sang lutuk a, chu chuan bubble te thanlenna a tikhawlo a ni.
4)Time: Vulcanization hun tling lo leh rubber compound a set kim hmaa tihchhiat chuan bubble rupture emaw product shrinkage emaw a thlen thei. Rubber compound dahkhawlna hun tawp tawh: Foaming agent emaw vulcanizing agent emaw hnathawh chu a dahnaah a tlahniam.
3. Open holes leh closed holes ratio chu a inthlau hle .
Thilmak:
1)Excessive closed cells: Product hian rebound tha tak a nei a, mahse a na hle niin a hria a, permanent compression set lian tak a nei bawk.
2)Too many holes: Product hi a nem hle a, mahse resilience a nei tha lo a, compression leh deformation a nei awlsam a, sponge ang maiin a awm.
A chhan tam tak avanga lo awm a ni:
Rubber Compound chakna: Rubber compound ngei pawh a inzawm tlat (GEL chakna) hi a pawimawh ber a ni. Strength sang tak, bubble wall hi tihchhiat a awlsam lo va, closed cell siam pawh a awlsam hle. chakna hniam leh open holes siam duhna.
Foaming leh vulcanization balance: A chunga kan sawi tawh ang khan vulcanization speed hi foaming speed aiin a tlan chak zawk deuh a, hei hian bubble wall stabilize leh closed cells siam a pui a ni.