Blow molding machine continuously extrude classification and application scene.
There are three types of continuous extrusion blow molding.
In the reciprocating extrusion blow molding, the parison blow molding location as shown in figure 5-1 (a), is located in the mould clamping location below, can also be used as shown in figure 5-1 (b), as shown in figure 5-1 (c) is located in the one side or both sides of clamping location.When the blank is long enough, the blow molding tool will move from the blow molding station to the bottom of the machine head, and then return to the blow molding station after the mold and clamping blank.You can also use clamps to hold the blank, move it to the mold, no need to move the mold.
(2) rotation out of material.
As shown in FIG. 5-2, they use the flow valve to control the flow of the melt, and rotate the melt through the extruder on either side of the extruder.The blanking and the cooling and removal of the die and die are carried out under the nose.The production is high because of the multiple heads.
(3) rotary table type
The rotary blow molding machine is shown in figure 5-3 (a), and (b) horizontal rotary table as shown in figure 5-3 (c).
Figure 5-3 (a) the horizontal rotary blow molding process is divided into four stations, and the mold is transferred to the blow molding, cooling and product removal station after the first working position is cut.
Figure 5-3 (b), (c) of the rotary blow molding machine in horizontal or vertical wheel set of set of blow molding mold, after parison is mould clamping, around the rotary axis of rotation, was blown up, after cooling mould, take products.These two kinds of continuous blow molding machine tensile effect of parison products must produce high, but the mould structure is complex, high equipment cost, large production batch (e.g., the annual output of 2.5 million pieces) is used.Get more knowledge of blowing plastic!Please pay attention to "blow molding machine" WeChat public platform, WeChat search Kinggle_song. In addition, there is residual material between each product, which needs to be attached to the process of thread cutting.
The rotary blow molding machine is suitable for PE, PP and PVC, and can be used as a container with a production capacity of 0.9-8.5L at 2000-5000 / time.
Continuous extrusion blow molding is applicable to a variety of plastics, generally forming volume of small volume, the plastic with high melt strength of the type billet, also can be formed large products, such as 120L above the VAT.Due to the low possibility of melt degradation, this method is especially suitable for plastics with poor thermal stability such as PVC.
What is the range of continuous extrusion blow molding?
1. Medium capacity container or hollow product.This kind of product needs a large amount of extruded blank, and the corresponding type billet is also longer.In this way, the billet blowing, cooling and product ejection can be synchronously carried out and completed in the same period, and the continuous extrusion blow molding can be achieved.
This way of molding, blow molding for 5-50 l container, if choose high melt viscosity, high strength plastic material, due to the improvement of the weight of parison sag phenomenon, forming a larger volume of the container.
Small containers of large quantities.The production of the bottle container is small, and it can't be blown out of the blank in the extrusion time of a type blank.When mass production of small vessel, the use of two or even more mould and clamping device, relative delay can blow molding volume molding cycle, continuous extrusion blow molding extrusion blow molding.
3. Plastic bottles and hollow products with poor thermal stability such as PVC.Due to the continuous extrusion, the retention time of materials in the extrusion process is short and not easy to degrade, so the blow molding of PVC and other plastics can be carried out in a long and stable manner.This kind of molding is also suitable for LDPE, HDPE, PP and other plastic blow molding.