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Laser-weldable polymers

A technology of laser welding and polymer, which is applied in the direction of laser welding equipment, welding equipment, manufacturing tools, etc., and can solve the problems of inability to obtain welding

Active Publication Date: 2010-02-10
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the plastic melts when a stronger absorbing additive is used for the laser absorbing part in transmission laser welding, a stable weld cannot be obtained

Method used

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  • Laser-weldable polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Laser transparency part: natural PP

[0032] Laser absorbing part: PP with 1% copper hydroxide phosphate

[0033] A welding speed of 60 mm / s is achieved here. This corresponds to an energy per unit length of 25 J / cm.

Embodiment 2

[0035] Laser transparency fraction: Contains 0.1% 820PP

[0036] Laser absorbing part: PP with 1% copper hydroxide phosphate

[0037] A welding speed of 120 mm / s is achieved here. This corresponds to an energy per unit length of 12.5 J / cm.

Embodiment 3

[0039] For light-colored plastic formulations with TiO 2 formulations

[0040] Laser transparency fraction: Contains 0.1% 820PP

[0041] Laser absorbing part: Contains 0.5% copper hydroxide phosphate and 0.5% TiO 2 PP

[0042] A welding speed of 150 mm / s is achieved here. This corresponds to an energy per unit length of 10 J / cm.

[0043] In strength tests, all specimens tear in the base material but not in the weld. The examples listed illustrate that using a stronger absorber on the absorptive side and optionally a weaker absorber on the laser transparent side accelerates the welding speed by >3 times and the energy per unit length is thus only that of the starting material 1 / 3.

[0044] The values ​​of total transmittance, diffuse transmittance and total reflectance of the plastic flakes used were measured using a Perkin-Elmer instrument (Lamda900) with an Ulbricht sphere. The absorbance in Table 1 is calculated from the total transmittance and total reflectance (10...

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Abstract

The invention relates to laser-weldable polymers comprising a laser-transparent part and a laser-absorbing part. Said polymers can be welded together by means of laser light and are characterized in that the laser-absorbing part contains copper phosphate hydroxide and / or copper phosphate as an absorber.

Description

technical field [0001] The invention relates to a laser-weldable polymer which consists of a laser-transparent part (Teil) and a laser-absorbing part and is characterized in that the laser-absorbing part contains copper hydroxide phosphate and / or copper phosphate as absorber. Background technique [0002] Transmission laser welding is a technique developed for welding materials such as plastics together. This is achieved by bringing two plastic elements in contact with each other, one of them being transparent to the laser light and the other being opaque to the laser light. The contact area between the two plastic elements is then exposed to a laser beam. The laser beam passes through a transparent plastic element and is absorbed by a second opaque plastic element. This causes the opaque plastic element to heat up so that the contact area between the two plastic elements melts, forming a weld. The laser used is usually a diode laser or Nd:YAG laser with a wavelength betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/00C08K3/32
CPCC08K3/32B29C66/71B29C65/1677B29C65/1674B29C65/1654B29C65/16B29C65/1635B29C65/1616B29C66/73921B29C66/73772B29C66/73774B29K2023/00B29K2077/00B29K2067/00B29K2071/00B29K2071/12B29K2075/00B29K2059/00B29K2033/12B29K2031/04B29K2029/14B29K2025/06B29K2055/02B29K2027/06B29K2027/08B29K2027/16B29K2027/18B29K2069/00B29K2081/06B29K2021/003B29K2033/08C08K2003/328
Inventor S·罗森伯格
Owner MERCK PATENT GMBH
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