clamping tonnage VS shot weight

clamping tonnage(T-吨)	shot weight(g-克)	shot weight(oz-盎司)
10	7	0.24
20	18	0.64
30	31	1.1
40	48	1.7
50	65	2.3
60	85	3
70	116	4.1
80	128	4.5
90	151	5.3
100	173	6.1
110	199	7
120	224	7.9
130	250	8.8
140	278	9.8
150	307	10.8
160	335	11.8
180	395	13.9
200	457	16.1
220	523	18.4
250	628	22.1
300	809	28.5
350	1003	35.3
400	1210	42.6
450	1426	50.2
500	1653	58.2
550	1889	66.5
600	2133	75.1
650	2386	84
850	3465	122
1000	4374	154
1200	5623	198
1400	6986	246
1600	8435	297
1800	9940	350
2000	11502	405

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Injection Molding Clamping Force Calculation

Class	Plastic Material	Constant K
1	PS,PE,PP	X1.0
2	PA,PBT,PETP	X1.3-1.35
3	CA,CAB,CAP,EVA,PEEL,PPVC	X1.35-1.45
4	ABS,ASA/AAS,POM	X1.45-1.55
5	PMMA,PC/ABS,PC/PBT	X1.55-1.70
6	PC,PES,PSU,PEEK,UPVC,PEI	X1.70-1.90

chart 1.

A round PC lamp base with 220mm outter diameter,and the wall thickness range from 1.9-2.2mm,the gate is one drop pinpoint gate.What is the clamping force need for this part?

F=Po*K*S

S: S=3.14*22*22/4=380CM^2

P0: L/T=200/1.9=105:1 [200 is the longest distance of melt flowing=220/2+90(runner lenght)]

check the chart 1. above,the 105 points to the pressure about 165,so the Po is 160 bar

K: PC material ‘s constant K is 1.7-1.9,now we choose 1.9 for safe reason,so

F=160*1.9*380=115.5 ton.

The L/T ratio:

	1.0mm (thickness)	1.5mm (thickness)	2.0mm (thickness)	2.5mm (thickness)	3.0mm (thickness)	3.5mm (thickness)	4.0mm (thickness)
GPPS	<60	60-110	110-170	170-240	240-340	340-450	450-560
HIPS	<60	60-110	110-160	160-230	230-330	330-420	420-520
PP	<70	70-130	130-180	180-250	250-380	380-500	500-650
PE	<80	80-150	150-220	220-300	300-430	430-580	580-700
POM	<50	50-100	100-150	150-210	210-310	310-420	420-500
ABS	<50	50-100	100-150	150-200	200-300	300-400	400-500
AS	<40	40-80	80-130	130-180	180-250	250-350	350-450
PC	<35	35-70	70-110	110-160	160-200	200-280	280-370