for sunny days not exceeding 3h and rainy days Ih. Table 6-2: injection molding temperature range of partial plastics Plastic Types Temperature of Barrel℃ of mold℃ PS Types HIPS 220-270 190~260 150~160 ABS 220~270 190-260 SAN 220~270 200-250 150~160 LDPE 20-60 230~310 HDPE 230~310 220~300 130~200 220~325 140~180 PVC Types Hard PVc 170~200 140~150 Soft pⅤC 170~200 70~115 230~270 PMMA PA Type PA6 50-80 210-230 210-230 200-210 PA66 250-280 250-280 190~250 175~210 160-180 CA Types CAB 30~75 140~150 140~150 120~130 30-75 l80~200 150~18 180~210 190~22 160~180 Table 6-3: drying temperature and time range of partial plastics Plastic type Drying temperature and time range PS Types(PS-ABS PMMA 68h 80~100℃10~14h CAB-VP Ty 2. Mold Clamping System The mold clamping device should meet the following requirements To have sufficient clamping force and to ensure that no overflow of the mold shall occur under the pressure from fused materials To have sufficient mold plate area, stroke and space to suit for the molding of plastic parts with different shapes and dimensions The running speed of mold plate should be first fast then slow during mold clamping and first slow then fast during mold opening to avoid collision of molds during mold clamping and to have the plastic parts ejected steadily Sufficient intensity of the mold plate should be ensured to avoid distortion or damage to the molds during molding as incurred by the frequent pressure applied thereto, which may influence the steadiness of the products' dimension and service life of the injection molding The mold clamping device mainly consists of the mold clamping unit, mold adjusting unit, ejector front and rear retainer plate, moving plate and rod as well as the oil tank etc According to the different method for achieving clamping force, the common structural forms of thefor sunny days not exceeding 3h and rainy days 1h. Table 6-2: injection molding temperature range of partial plastics Temperature of Barrel℃ Plastic Types Temperature of Mold℃ Inject#1 Inject#2 Inject#3 PS Types PS HIPS ABS SAN 10~75 10~75 10~80 10~80 200~280 220~270 220~270 220~270 200~260 190~260 190~260 200~250 150~160 150~160 150~160 150~160 LDPE Types LDPE HDPE PP 20~60 20~60 10~80 230~310 230~310 220~325 220~300 220~300 220~290 130~200 130~200 140~180 PVC Types Hard PVC Soft PVC 20~60 20~60 170~200 170~200 170~200 140~200 140~150 130~140 PC 70~115 300~350 280~340 230~270 PMMA 30~70 190~240 190~220 140~170 PA Types PA6 PA66 50~80 50~80 210~230 250~280 210~230 250~280 200~210 190~250 POM 60~90 190~210 175~210 160~180 CA Types CAB CA CP 30~75 30~75 30~80 140~150 180~200 180~210 140~150 150~180 190~220 120~130 130~150 160~180 Table 6-3: drying temperature and time range of partial plastics Plastic types Drying temperature and time range PS Types（PS-ABS） 60~80℃ 1~4 h PC 100~120℃ 7~8 h PMMA 70~80℃ 6~8 h PA Types 80~100℃ 10~14 h CA-CAB-VP Types 70~80℃ 2~4 h 2. Mold Clamping System The mold clamping device should meet the following requirements: z To have sufficient clamping force and to ensure that no overflow of the mold shall occur under the pressure from fused materials. z To have sufficient mold plate area, stroke and space to suit for the molding of plastic parts with different shapes and dimensions. z The running speed of mold plate should be first fast then slow during mold clamping and first slow then fast during mold opening to avoid collision of molds during mold clamping and to have the plastic parts ejected steadily. z Sufficient intensity of the mold plate should be ensured to avoid distortion or damage to the molds during molding as incurred by the frequent pressure applied thereto, which may influence the steadiness of the products’ dimension and service life of the injection molding machine. The mold clamping device mainly consists of the mold clamping unit, mold adjusting unit, ejector unit, front and rear retainer plate, moving plate and rod as well as the oil tank etc. 1) Mold Clamping Unit According to the different method for achieving clamping force, the common structural forms of the