Filling of liquid materials (4)

10. Timing / pressure filling method This is a new type of constant volume filling method that began in 1980. This method is extremely accurate. The filling equipment has no moving parts touching the liquid material. The filling system can be cleaned or steam sterilized without having to disassemble. Constant volume does not rely on pistons or diaphragms, but on precise control of fluid flow time. The flow rate of the liquid material is regulated by the controlled discharge port and is uniform and stable. Both the pressure and the flow rate are controlled by a microcomputer (micro-computer control of the flow rate, and the size of the discharge port is controlled by a micro-motion mechanism).
This method can achieve bottom lift filling. As shown in Fig. 9-10, the pressure tank 1 is provided with a liquid supply valve 2 in the middle and a pressure supply valve 4 at the upper part, and the sterilized air or nitrogen gas enters the supply valve through the pressure controller 5. A pressure sensor 6 is provided to detect the pressure of the liquid material at any time. The liquid material is conveyed to the multi-channel supply pipe 7 by the effect of pressure, and is then sent to the filling station via the controllable infusion valve 9 . The discharge port is controlled by a microcomputer 8.

This method can be used to fill all kinds of non-gas liquid materials other than viscous liquid materials. It is especially suitable for filling precious liquid materials and medicines with high requirements for metering precision, or highly toxic and corrosive liquid materials. And, it is easy to achieve sterilization filling.
From the 10 filling methods listed above, it can be seen that the filling method and the nature of the filling liquid material, the shape and material of the filling container, the filling flow rate, and the performance of the filling equipment, the price and the automation program, etc. close relationship. Therefore, the selection of filling methods is more complex and should be considered comprehensively based on various factors including technology, economy and production management.
The characteristics and application range of various filling methods and the factors affecting the selection are listed in Table 9-1 for comparison and selection.
Table 9-1    Various filling methods comparison table
Serial number filling method

Filling type

Suitable for filling materials

(Viscosity) Pa . s

Normal align=left> Suitable for filling

Container

Normal align=left> Filling speed range


Bottle
/min

Normal align=left> Container when filling

Do you need to seal

Advantages and disadvantages and application range

1

Pure gravity

Fixed level

Normal align=center> Stream


(
0.001 to 0.1 )

Normal alig


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