Moulding technology for lead-boron polyethylene sheet

A lead-boron-polyethylene, sheet forming technology, applied in nuclear engineering, reactors, shielding and other directions, can solve the problems of large investment, complex operation, large pollution, etc., to reduce lead vapor pollution, simple operation, and reduced contact area. Effect

Inactive Publication Date: 2004-06-16
NUCLEAR POWER INSTITUTE OF CHINA
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AI-Extracted Technical Summary

Problems solved by technology

As we all know, this process has the disadvantages of large pollution and complicated operation, and its ...
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Abstract

The invention relates to a moulding process of lead-boron polythene thin plate comprising the steps of, plasticizing the uniformly amalgamated polythene material in extrusion machine, squeezing using granulation die arrangement, cooling-down, plasticizing in extrusion machine and squeezing using sheet material die arrangement, calendaring and dragging simultaneously. The advantages of the process according to the invention are low equipment investment, simplicity of operation, and less lead vapor volatilization in operational process.

Application Domain

Shielding

Technology Topic

Materials scienceBoron +4

Examples

  • Experimental program(3)

Example Embodiment

[0009] Example 1.
[0010] 1. Put the uniformly mixed, cooled and broken lead-boron polyethylene material into the extruder, and extrude it through the pelletizing die after being plasticized. During extrusion, the temperature of the material in the extruder is maintained at 90°C and the motor speed is 800 Rpm, cutter speed is 350 rpm;
[0011] 2. Cool the extruded pellets on the vibrating spring bed to no longer stick;
[0012] 3. Put the cooled pellets into the extruder, extrude through the plate die after plasticization, calender and draw with double-roll calender rolls, the main motor frequency is 12Hz, the feeding frequency is 21Hz during extrusion, and the feed frequency is 21Hz. The working temperature of the extruder rises from 110°C to 160°C when the material is discharged. The calendering and traction frequency of the two-roller calender roll are both 6.0 Hz. Finally, the cooling setting plate is used for cooling and shaping.

Example Embodiment

[0013] Example 2.
[0014] 1. Put the uniformly mixed, cooled and broken lead-boron polyethylene material into the extruder, and then extrude it through a pelletizing die after being plasticized. During extrusion, the temperature of the material in the extruder is maintained at 100°C and the motor speed is 700. Rpm, cutter speed is 300 rpm;
[0015] 2. Cool the extruded pellets on the vibrating spring bed to no longer stick;
[0016] 3. Put the cooled pellets into the extruder, extrude through the plate die after plasticization, calender and draw with double-roll calender rolls, the main motor frequency is 12Hz, the feeding frequency is 21Hz during extrusion, and the feed frequency is 21Hz. The working temperature of the extruder rises from 120°C to 170°C when the material is discharged. The calendering and traction frequency of the two-roller calender roll are both 5.6 Hz. Finally, the cooling setting plate is used for cooling and shaping.

Example Embodiment

[0017] Example 3.
[0018] 1. Put the uniformly mixed, cooled and broken lead-boron polyethylene material into the extruder, and extrude it through the pelletizing die after being plasticized. The temperature of the material in the extruder is maintained at 90-150°C during extrusion. The motor speed is 600 rpm, and the cutter speed is 220 rpm;
[0019] 2. Cool the extruded pellets on the vibrating spring bed to no longer stick;
[0020] 3. Put the cooled pellets into the extruder, extrude them through the plate die after plasticization, calender and draw them with a double-roller calender roll, the main motor frequency is 12Hz, the feeding frequency is 21Hz during extrusion, and the feeding frequency is 21Hz. The working temperature of the extruder rises from 120°C to 165°C when the material is discharged. The calendering and traction frequency of the two-roller calendering roll are both 5.0 Hz. Finally, the cooling setting plate is used for cooling and shaping.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Classification and recommendation of technical efficacy words

  • Reduce contact area

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Easy to operateExtrusionPolyethyleneSheet material
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