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  Working Failure Information of Molding Machine (metering failure)
One of the typical items of working failure of molding machine caused by material resin is metering failure. Countermeasures for the metering failure are proposed as follows:

Metering failure countermeasures
In principle, materials which can not be metered or fluctuate in metering are not sold, since such materials are hard to produce for the difficulty of passing through an extruder in the pelletizing process.
A considerable part of the metering failure (no metering, long metering time, and fluctuation of metering time) in the market are related with wear of cylinder or screw, breakage or wear of check valve, etc. In such a case check of molding machine is recommended.

Countermeasures for materials of relatively long metering time are given in Table 1:

Table 1 Countermeasures for materials of relatively long metering time
Sliding grades ofDuracon To reduce the cylinder temperature only right under the hopper by 10-20
Vectra
 To raise the temperatures at the rear
(A countermeasure example for E130i is shown in Table 2.)

Table 2 A countermeasure example for E130i
Standard condition (Nozzle) 350-350-340-330 (Under-hopper)
Countermeasure condition (Nozzle) 350-350-350-350 (Under-hopper) / Flat setting
(Nozzle) 350-350-360-370 (Under-hopper) / Reverse setting

It is also effective to lower the back pressure, to increase the screw rotation speed, to set the suck-back at 2-3 mm, to carry out predrying, and to preheat the material.


The data shown in this home page are based on our accumulated experience and laboratory data, and not always directly applicable to your products used under different conditions. Therefore, we can not guarantee that the contents of this home page are directly applicable as they are to the specific condition in our customers, and we appreciate your final decision on the use of these data.