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Plastic laser welding method

A technology of laser welding and plastics, applied in the field of laser welding, can solve problems such as high price, limited application field, and existence of safety risks

Active Publication Date: 2018-07-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a commonly used light absorber, carbon black has a high light-to-heat conversion efficiency, but it also makes the welding surface or weldment have to be "stained"; on the other hand, some commercial clean light absorbers that do not dye Or the price is high or there are security risks, and its application fields are subject to certain restrictions

Method used

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Examples

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Effect test

Embodiment 1

[0025] A method of laser welding plastic parts, with molecular weight 50000g / mol, thickness is 0.2mm polycaprolactone (T m ≈60°C) welding as an example, the method includes the following steps:

[0026] (1) Brush 10μl / cm on the area where the two plastic parts are to be welded 2 Butt the joints and keep the joints to be welded in close contact;

[0027] (2) Use a laser with a wavelength of 1470nm to irradiate the welding area, adjust the output power of the laser to 0.5W, the welding area will start to melt after 5s, and form a melting surface with a spot size after 10s, then turn off the laser, cool and solidify naturally to form a welding area, and complete the welding .

[0028] Cut the samples before and after welding into dumbbell shapes respectively, and carry out the tensile test. The samples before the test are as follows: image 3 as shown, Figure 4 is the stress-strain curve of the sample before and after welding at room temperature.

[0029] Depend on image ...

Embodiment 2

[0032] A kind of method of laser welding plastic parts, take molecular weight 50000g / mol, thickness be the polycaprolactone (PCL) plastic part welding of 1mm as example, described method comprises the following steps:

[0033] (1) Spray 10μl / cm on the area where the two plastic parts are to be welded 2 water, and keep the joints to be welded in close contact;

[0034] (2) Use a laser with a wavelength of 1910nm to irradiate the welding area, and adjust the output power of the laser to 0.5W. After 5s, the welding area begins to melt, and after 10s, a melting surface with a spot size is formed. Then turn off the laser, cool and solidify naturally to form a welding area, and complete the welding. .

Embodiment 3

[0036] A method of laser welding plastic parts, with molecular weight 80000g / mol, thickness is 0.2mm polycaprolactone (T m ≈60°C) welding of plastic parts as an example, the method includes the following steps:

[0037] (1) Wipe 6 μl / cm on the area where the two plastic parts are to be welded 2 water, and keep the joints to be welded in close contact;

[0038] (2) Use a laser with a wavelength of 1470nm to irradiate the welding area, and adjust the output power of the laser to 0.5W. After 5s, the welding area begins to melt, and after 10s, a melting surface with a spot size is formed. Then turn off the laser, cool and solidify naturally to form a welding area, and complete the welding. .

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Abstract

The invention discloses a plastic laser welding method. The method comprises the following steps: (1) applying water to a to-be-welded region of to-be-welded plastic so as to keep the to-be-welded region of the to-be-welded plastic in close contact; (2) irradiating the to-be-welded region with a laser to complete welding of plastic. Water is used as a solder (a photothermal conversion carrier) without doping of any other light absorption filler or pigment, so that green, environment friendliness, no toxicity and harmlessness are truly achieved; the method has great application value in fieldsof food packaging, medical devices, welding of precision and complicated plastic parts and the like.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a method for welding plastics by laser. Background technique [0002] Laser welding of plastics has become a new force in the field of welding. To apply laser welding to plastics, the material must absorb the laser light. The general laser transmission welding method generally applies a suitable light absorber at the contact surface of the two parts to be welded or pre-mixes a suitable filler or pigment in the lower welded part as a light absorber, and then completes the welding. As a commonly used light absorber, carbon black has a high light-to-heat conversion efficiency, but it also makes the welding surface or weldment have to be "stained"; on the other hand, some non-dyed commercial clean light absorbers Or the price is high or there are security risks, and its application field is subject to certain restrictions. Contents of the invention [0003] To solve the ab...

Claims

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Application Information

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IPC IPC(8): B29C65/16
CPCB29C65/16B29C66/71
Inventor 张洪吉宋雨方东为富马丕明施冬健李小杰陈明清
Owner JIANGNAN UNIV
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