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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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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.

Description

technical field [0001] The invention relates to a plastic thin plate forming process, in particular to a polyethylene thin plate forming process that can be used for radiation shielding. Background technique [0002] In the thin plate forming process of the traditional plastic industry, the calendering method is generally used to form a uniformly mixed mixture for similar materials such as lead-boron polyethylene, such as "High-efficiency shielding material lead-boron polyethylene" ("Nuclear Power Engineering" V01.15, No. .4, P370 ~ 374) described molding process is exactly to adopt two rolls of materials, two rolls out of the sheet. As we all know, this process has the disadvantages of heavy pollution and complicated operation, and its main equipment includes kneader, plasticizer, calender and boiler, etc., and the investment is very large. Contents of the invention [0003] The object of the present invention is to provide a lead-boron polyethylene thin plate molding pr...

Claims

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Application Information

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IPC IPC(8): B29C69/00G21F1/10
Inventor 杨勇飞邹从沛王晓敏吴莹谷晓非
Owner NUCLEAR POWER INSTITUTE OF CHINA
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