According to the different extrusion and traction directions, the forming process of
polyethylene blown film can be divided into three types: flat blow, top blow and bottom blow. Let's take a look at it:
1. Flat extrusion method
The method uses a right angle handpiece, that is, the discharge direction of the machine head is perpendicular to the extruder, the extrusion pipe is broken upward, and after being pulled to a certain distance, it is clamped by the herringbone plate, and the extruded tubular air is introduced from the bottom to compress it. Inflated into a bubble tube, and its transverse dimension is controlled by the amount of compressed air gas, the longitudinal dimension is controlled by the traction speed, and the blown film can be obtained by cooling and setting the bubble tube. The main plastics suitable for the upper blowing method are PVC, PE, PS, HDPE.
2, the flat extrusion method
The method uses a right angle handpiece, and the process of drawing the bubble tube from under the machine head is called a flat extrusion method. This method is particularly suitable for raw materials with low viscosity and plastic films requiring high transparency. Such as PP, PA, PVDC (vinylidene chloride).
3, flat extrusion blow method
The method uses a straight head that is concentric with the extruder screw. The process of the bubble tube and the center line of the head is on the same level. The method is only suitable for blowing small-diameter films, such as LDPE. PVC, PS film, flat blowing method is also suitable for the production of blown heat shrinkable film.
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Gabion mesh including : heavy gabion/hexagonal mesh, Gabion Box, gabion mesh sack, welded gabion mesh, Prevention rockfall Mesh.
Gabion mesh's production processes : material inspection- PVC coating- machine weaving- alignment- cutting- edge strengthening- assembly- packing- transporting
The material of gabion mesh is low carbon Steel Wire, and then will be hot-dipped galvanized, re-plated with Galfan or PVC, so as to improve the durability of the gabion mesh under all sorts of environments.
Applications of gabion mesh :
It has the effect of controlling water capacity, prevent soil and water from flowing,the protecting and improvement of the ecological environment. Gabion can be employed in a variety of ways to stabilize soil conditions around bridges and river bank protection.
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