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Method and device for plasticizing plastics based on Nd: YAG solid state laser

A solid-state laser and plastic technology, applied in the field of laser micro-molding, can solve problems such as the inability to achieve micro-plasticization effect, the limitation of lap welding of engineering plastics, and the inability to penetrate plastic materials, so as to achieve precise and controllable laser parameters and solve hard Point problem, high uniformity effect

Active Publication Date: 2014-04-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the research on the application of laser welding plastics began in 1970. At first, CO2 laser was used. Since most plastic materials show strong absorption in this wavelength range, high-speed laser welding processing However, due to the long wavelength of CO2 laser, it cannot penetrate plastic materials, so that the lap welding of engineering plastics is limited; in recent years, the use of near-infrared Nd:YAG laser (λ =1.06μm) light source, using the characteristics of laser-transmitting plastic and laser-absorbing plastic, the laser beam passes through the laser-absorbing plastic to reach the surface of the laser-absorbing plastic, and the surface of the laser-absorbing plastic is heated to soften and melt, and at the same time , due to the effect of heat conduction, the side of the laser plastic is also heated to soften and melt. When the melted size reaches the specified requirements, under the continuous action of a certain pressure, the welding of thermoplastics is realized. However, the thickness of the generally welded melting area is several About ten microns, can not achieve a stable micro-plasticizing effect
The research and application of plastic microplasticization by using the thermal effect of laser has not yet been reported in literature.

Method used

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  • Method and device for plasticizing plastics based on Nd: YAG solid state laser
  • Method and device for plasticizing plastics based on Nd: YAG solid state laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the plasticization of polar molecular PS (polystyrene) particles with a diameter of 2 mm, a thickness of 1 mm, and a mass of about 3.5 mg as an example.

[0024] First prepare plastic granules with a diameter of 2mm and a thickness of 1mm, which are punched by a granulator or sheet material, dried in an oven, put into a plasticizing cylinder, and covered with a constrained layer. The constrained layer is K9 glass. Light-transmitting and air-isolated to prevent the plastic from being oxidized by oxygen in the air when it melts.

[0025] Laser parameter adjustment. Turn on the Nd:YAG SP2000 solid-state laser, the laser outputs laser with a wavelength of 1064nm, and the output laser energy is 200mJ; the controller controls the laser beam regulator to adjust the spot size of the laser beam so that the diameter of the irradiated plastic surface is 2mm.

[0026] After the parameters are adjusted, the laser energy is irradiated at the fixed point to irradiate the plasti...

Embodiment 2

[0029] Take the plasticization of non-polar molecular PE (polyethylene) particles with a diameter of 2 mm, a thickness of 2 mm, and a mass of about 7 mg as an example.

[0030] First prepare plastic granules. Polyethylene granules are plastic masterbatches with 0.7% carbon powder added, with a diameter of 2mm and a thickness of 2mm, or punched from a sheet, dried in an oven, put into a plasticizing cylinder, and capped. layer, the constraining layer is K9 glass.

[0031] Laser parameter adjustment. Turn on the Nd:YAG SP2000 solid-state laser, the laser outputs laser with a wavelength of 808nm, and the output laser energy is 300mJ; the controller controls the laser beam regulator to adjust the spot size of the laser beam so that the diameter of the irradiated plastic surface is 2mm.

[0032] After the parameters are adjusted, the laser energy is irradiated at the fixed position to irradiate the plastic in the plastic cylinder, and the burst is pulsed, the pulse width is 10ns, ...

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Abstract

The invention discloses a method and a device for plasticizing plastics based on a Nd: YAG solid state laser, relates to the laser micro-molding field, and is suitable for plasticizing, molding and processing micro-scale plasticized micro-plastics, such as miniature gears, connectors, chips and the like. According to the invention, the heat effect caused by interacting of a laser energy field and a polymer can be used, the plastic is irradiated under the laser with high energy density to absorb light energy, a rapid temperature rising is realized to reach the fusing temperature so that the micro-molding processing can be completed. The device of the invention comprises an Nd: YAG laser, a laser beam regulator, a restraint layer, a plasticizing cylinder, a molding die, a work bench and a controller. The method of the invention is used for plasticizing or molding plastics, and has the characteristics of high plasticizing efficiency of plastics, good quality, energy saving, environmental protection, simple and easy operation and good processing flexibility, and can realize the plastic micro-molding processing with high efficiency and environmental protection.

Description

technical field [0001] The present invention relates to the field of laser micromolding, in particular to a plastic plasticizing method and device based on Nd:YAG solid-state lasers, which are suitable for plasticizing and molding processing of micro-sized plastic parts, such as micro-sized gears, connectors and chips. Casting, micro injection molding, etc. Background technique [0002] The plasticization of plastics is a process in which the polymer changes from a glass state to a high elastic state to a viscous fluid state. There are many processing methods, including heating and screw shear plasticization, ultrasonic plasticization, microwave plasticization and mechanical vibration plasticization. wait. In the field of micro-injection molding, heating and screw shear plasticization are the most commonly used. For example, the Mcirosystem series micro-injection molding machine Mciorsystem50 launched by Battenfeld in Germany is a fully electronically driven injection moldi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C35/08
Inventor 周建忠谭文胜黄舒杨晶戴亚春
Owner JIANGSU UNIV
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