What Is The Difference between "Pre Mixing" And "Mixing" in Plastic Modification?

One Sentence Summary

▪  Pre mixing - refers to the mixing of modified materials (base materials, auxiliary materials, additives) in the pre mixing machine before the polymer mixing host (such as twin screw, continuous mixer, Booth kneading machine, three screw, etc.), and basically operating below the melting point of the base resin;

▪  Mixing - refers to the use of measuring scales (including weight loss scales, weight gain scales, solid volume pumps, etc.) above the main material inlet of the mixing host to achieve "mixing" of multi flavored materials in a small discharge well (or hopper), and to achieve "mixing" in the host; The latter obviously completes wetting, dispersion, extrusion, and granulation above the melting point of the base material.

Measurement Scale "Mixing" Process

The advantages are:

▪  Closed operation, improved working conditions in the workshop, and easy passing of enterprise environmental impact assessment;

▪  High measurement accuracy, stable quality of specialized materials or masterbatches.

The disadvantages are:

▪  The one-time investment is relatively large, and may even exceed that of the host;

▪  In situations where there is too much powder or stickiness, it is easy to "bridge" the small discharge well (or bucket);

▪  Due to the lack of pre wetting process, the length to diameter ratio of the master batch twin screws is large, and the screw arrangement and combination are complex and demanding.

Given the process steps of modified plastics, the weightless feeder plays an important role in plastic mixing. In the continuous plastic mixing extrusion process, various raw materials can be continuously and synchronously added by equipped with a weightless feeder, and sufficient accuracy can be achieved with corresponding proportions.

As an enterprise with decades of experience and technological research in plastic mixing, Changzhou Chuanli Weighing Technology Co., Ltd. (hereinafter referred to as "Changzhou Chuanli") has continuously provided solid and liquid metering ingredients and integrated solutions for the modified plastic industry in recent years. Various types of weight loss feeders adopt the weighing control technology and sensor technology of American Chuanli, providing customers with the most cost-effective weighing and measuring products.

Selection Principles for the "Pre Mixing" Process

▪  Reduce one-time investment, unleash the initiative of excellent technicians, explore the adaptability of key modified products, and explore ways for future production expansion;

▪  For the production of high filling polyolefin masterbatch, it is advisable to pre mix PP or PE particles (powder), mineral powder, coupling and other additives in high mixing machines;

▪  The color master batch production line (see the formula photo below) is premixed (pigment wetting) in the pre mixer first, and then mixed and granulated (dispersed) in the main machine. Due to ensuring the "wetting" time and effect, the mechanical internal force will further strengthen the "wetting" and "dispersion", and the produced color masterbatch will meet customer needs.

▪  It is crucial to pre mix loose PVC powder, plasticizer, and composite stabilizer thoroughly in the production of SPVC cable materials during high and low mixing!

NANJING HAISI is professional manufacturer of plastic extruder machine, Twin Screw Extruder, Single Screw Extruder, Plastic Recycling Extruder, Two Stage Extruder, Lab Scale Machinery, Mixing and Feeding Machine, Cooling and Pelletizing Machine, Crushing Machine and so on.