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

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...

Examples

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, ...

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...

Examples

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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