What Is An Adiabatic Runner?
Author: Samuel Song
2023-04-28
There is no auxiliary heating device in the runner, but the poor thermal conductivity of plastic is used to design the cross-sectional size of the runner to be very large (often more than 30mm), so that the plastic melt close to the surface wall of the runner will die due to the lower mold temperature. Rapidly condenses to form a frozen layer, while the melt in the center of the flow channel remains molten and flowing. In order to keep the flow channel unblocked in this system, the speed of the plastic melt flowing through the flow channel should be as fast as possible, so that the molten material in the flow channel is continuously replaced, and there is not enough time to completely freeze.
The main features of the adiabatic runner are low cost; easy replacement of materials during production; large diameter of the runner and small pressure loss; when the condensate of the runner freezes, it is easy to remove it by opening the parting surface. But because of its large size, the plastic heating time is prolonged. The temperature control is not ideal, and it is not suitable for processing heat-sensitive plastics. There are fewer applications.
It is usually used for products with low processing precision and short molding cycle, and the molding of small general-purpose plastic products such as PE, PP, and PS.
Hot runner classification
The hot runner system is divided into adiabatic runner (fully hot runner) and miniature semi hot runner system (semi hot runner). The design of the adiabatic runner is complicated, but the effect is good and the maintenance cost is very low. The micro semi-hot runner structure is simplified, stable and easy to use, low failure rate, low maintenance cost due to simple structure, and greater guarantee for stable production.
Open type (for miniature semi-hot runners), needle valve type (for adiabatic runners). The hot runner system generally consists of several parts such as hot nozzles, manifolds, temperature control boxes and accessories. Hot nozzles generally include two types: open hot nozzles and needle valve hot nozzles. Since the form of the hot nozzle directly determines the selection of the hot runner system and the manufacture of the mold, the hot runner system is often divided into an open hot runner system and a needle valve hot runner system. Diverter plate is used when one mold has multiple cavities or multi-point feeding, single-point feeding but the material level is offset. The material is usually P20 or H13. Splitter plates are generally divided into two categories: standard and non-standard, and their structure is mainly determined by the distribution of the cavity on the mold, the arrangement of the nozzles and the position of the gate. The temperature control box includes the host, cables, connectors and wiring male and female sockets, etc. Hot runner accessories usually include: heaters and thermocouples, runner seals, connectors and junction boxes, etc.
The main features of the adiabatic runner are low cost; easy replacement of materials during production; large diameter of the runner and small pressure loss; when the condensate of the runner freezes, it is easy to remove it by opening the parting surface. But because of its large size, the plastic heating time is prolonged. The temperature control is not ideal, and it is not suitable for processing heat-sensitive plastics. There are fewer applications.
It is usually used for products with low processing precision and short molding cycle, and the molding of small general-purpose plastic products such as PE, PP, and PS.
Hot runner classification
The hot runner system is divided into adiabatic runner (fully hot runner) and miniature semi hot runner system (semi hot runner). The design of the adiabatic runner is complicated, but the effect is good and the maintenance cost is very low. The micro semi-hot runner structure is simplified, stable and easy to use, low failure rate, low maintenance cost due to simple structure, and greater guarantee for stable production.
Open type (for miniature semi-hot runners), needle valve type (for adiabatic runners). The hot runner system generally consists of several parts such as hot nozzles, manifolds, temperature control boxes and accessories. Hot nozzles generally include two types: open hot nozzles and needle valve hot nozzles. Since the form of the hot nozzle directly determines the selection of the hot runner system and the manufacture of the mold, the hot runner system is often divided into an open hot runner system and a needle valve hot runner system. Diverter plate is used when one mold has multiple cavities or multi-point feeding, single-point feeding but the material level is offset. The material is usually P20 or H13. Splitter plates are generally divided into two categories: standard and non-standard, and their structure is mainly determined by the distribution of the cavity on the mold, the arrangement of the nozzles and the position of the gate. The temperature control box includes the host, cables, connectors and wiring male and female sockets, etc. Hot runner accessories usually include: heaters and thermocouples, runner seals, connectors and junction boxes, etc.
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