Introduction to the characteristics of several types of barrel screw structure
1. Conventional, low filler, high filler structure difference
(1) Phillips, groove geometry and matching relationship
Less content: the gap between the spiral edge and the screw edge is larger
More content: the gap between the spiral edge and the spiral edge is smaller, the purpose is to increase the shear force and increase the plasticization.
(2) The role of each regional segment. The screw is generally divided into: a feed section, a compression section, a block section, a mixing section, an exhaust section, and a metering section.
Feeding section: Generally, the conveying edge has a large gap and the conveying speed is fast, and vice versa. It is also related to the formula and ingredients.
Compression, material blocking, mixing: The main influence is the plasticizing ability. If there is a material before compression, plasticization can be increased. If a material is provided, it is not suitable for high calcium, mixing and Compression is set together and is generally only suitable for low calcium.
Exhaust section: The plasticizing ability of the material can be observed from the vacuum port, which is granular, powdery, and strip-shaped.
Metering section: the gap of the screw edge is large, the extrusion is fast, and vice versa.
2. Low-filler, high-filler structure features:
Low-fill screw feed section, compression, and mixing are combined. When the car is processed, the last stage of the feed section becomes smaller and becomes a compression section, and then on the compression section. Slotting, adding 2 turns of material to increase plasticization, the rear exhaust section and metering section are larger than the screw gap; the high-fill screw structure consists of feeding section, material blocking, compression, material blocking, mixing,
The gap between the exhaust section, the metering section, the feeding section and the metering section is small.
3. Introduction of screw and barrel thermostatic control structure
Internal circulation: automatic circulation of distilled water
External circulation: screw temperature control can be set, the material temperature can be controlled, the screw can be protected during the startup process and during the production process, and the production can be stabilized. If not used, the product should be discolored for the processing of the profile.
Barrel temperature control: There are two kinds of air cooling and oil cooling. Relatively speaking, the oil cooling temperature control accuracy is greater than the air cooling temperature control accuracy, but the oil circuit is easy to block during use, and the failure rate is higher than air cooling.
