Vacuum calibrating method for pre-insulated extrusion line

The vacuum calibration polyurethane insulation pipe is a kind of high efficiency pre insulated pipe. It is mainly composed of working steel pipe, PU insulation layer, plastic outer protective pipe and other parts. The working steel pipe is in the innermost layer and assumes the conveying medium(For example: hot water, steam) function. In the middle there is a PU insulation layer, playing the role of heat preservation and insulation, which can effectively reduce heat loss. The outermost layer is a plastic outer protective tube, usually made of materials such as high-density PE. It can protect the insulation layer from the external environment erosion, but also make the pipe appearance more regular.

The polyethylene jackets/sheaths produced by our vacuum calibration insulation pipe production line feature high strength, excellent toughness, smooth pipe surfaces, strong pressure resistance, and uniform wall thickness. These characteristics make them ideal for manufacturers of thermal insulation pipes.

The core technology of Huastar PE960-1880 insulation pipe production line is at the leading level in China, and a number of innovation points and design concepts have filled the gaps in China, among which four core technologies such as solid-liquid phase separation screw, spiral diverter head, DCL human-machine dialogue technology, and real box external manipulator technology are the first or first applied in the industry. This product is also the only domestic production line capable of manufacturing 1880mm large diameter insulation pipe.

Vacuum feeding PE granule-->hot air dry material-->extrusion plasticizing-->mold shaping-->Vacuum sizing-->water cooling-->Pulling out-->cutting pipe-->carrier laying-off pipe

• hopper dryer
• Single Screw Extruder
• extrusion mould die
• Head bracket
• Vacuum calibration device
• Water cooling tank
• haul-off
• Planetary cutting machine
• Pipe bracket
• Loader
• PLC

The production process of "pipe in pipe" (PU Foaming Pre-insulated Pipe) mainly includes three steps: surface pretreatment of steel pipe, production of HDPE outer protective pipe and production of insulation layer.

The production steps of insulation layer are as follows: firstly, the steel pipe is penetrated into the high-density polyethylene outer protection pipe to form a casing structure, and the supports are evenly arranged in the annular space between the steel pipe and the high-density polyethylene outer protection pipe, and the two ends are sealed by flanges; secondly, the casing is hoisted on the foaming platform, and the polyurethane foaming material is injected into the casing by high-pressure foaming machine; finally, the polyurethane material is foamed After curing, the sealing structure at both ends is removed to complete the production process of the insulation layer.

Rigidity due to the presence of strong ties between the steel pipe layer polyurethane insulation and jacket pipe and provides pre-shot blast or blast cleaning the surface of the steel pipe, optimum performance polyurethane insulation, corona surface of polyethylene pipe shell.

gas/oil /water pipeline Puf Pre-Insulated Pipe PE shell casing plastic Machinery

• Significantly increases the reliability of the pipeline in the PUF insulation system operational availability of remote condition monitoring PUF insulation, which allows to detect and repair leaking coolant, preventing accidents typical for thermal networks of other designs.
• Highly cost-effective use of pipelines in the foam insulation define the following parameters:
• Simplifying the construction, maintenance and repair;
• Increased service life of 30-40 years (traditional types of pipelines - 5-10 years);
• Reduction of heat losses to 8% (traditional types of pipelines - 30-40%);
• Reducing capital costs by 15-20% (not required construction of concrete channels and chambers for valves);
• Reduced operating costs by 9 times;
• Reduction in repair costs 3 times.

• small dimension
• high degree of automation, can be operated by one person, saving labor costs.
• long service life.
• high-efficiency extruder gives larger output and stable performance.
• pipe wall is average and smooth
• no waste of raw material
• once forming. No need to trim the edge.