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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 main equipment includes kneader, plasticizer, calender and boiler, etc., which requires a large investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 1. Put the uniformly mixed, cooled and crushed lead-boron polyethylene material into the extruder, and extrude it through the granulation die after plasticization. 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 a vibrating spring bed until they are no longer sticky;

[0012] 3. Put the cooled pellets into the extruder, extrude through the plate mold after plasticization, and use double-roll calender rollers to calender and draw. When extruding, the main motor frequency is 12Hz, and the feeding frequency is 21Hz. The working temperature of the discharge extruder rises from 110°C to 160°C, the calendering and traction frequency of the double-roll calendering rollers are both 6.0 Hz, and finally the cooling and shaping plate is used to cool and set the shape.

Embodiment 2

[0014] 1. Put the uniformly mixed, cooled and crushed lead-boron polyethylene material into the extruder, and extrude through the granulation die after plasticization. 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 a vibrating spring bed until they are no longer sticky;

[0016] 3. Put the cooled pellets into the extruder, extrude through the plate mold after plasticization, and use double-roll calender rollers to calender and draw. When extruding, the main motor frequency is 12Hz, and the feeding frequency is 21Hz. When the material is discharged, the working temperature of the extruder rises from 120°C to 170°C, the calendering and traction frequencies of the double-roll calendering rollers are both 5.6 Hz, and finally the cooling and shaping plate is used to cool and set the shape.

Embodiment 3

[0018] 1. Put the uniformly mixed, cooled and crushed lead-boron polyethylene material into the extruder, and extrude it through the granulation die after plasticization. During extrusion, the material temperature in the extruder is maintained between 90-150°C The motor speed is 600 rpm, and the cutter speed is 220 rpm;

[0019] 2. Cool the extruded pellets on a vibrating spring bed until they are no longer sticky;

[0020] 3. Put the cooled pellets into the extruder, extrude through the plate mold after plasticization, and use double-roll calender rollers to calender and draw. When extruding, the main motor frequency is 12Hz, and the feeding frequency is 21Hz. The working temperature of the discharge extruder rises from 120°C to 165°C, the calendering and traction frequencies of the double-roll calendering rollers are both 5.0 Hz, and finally the cooling and setting plate is used to cool and set the shape.

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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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