Laser-welded article

a technology of welded articles and welded parts, which is applied in the field of laser-welded articles, can solve the problems of reducing the production efficiency of welded articles, affecting the resin properties of first resin workpieces, and restricting the use of any resin, so as to achieve excellent recycling properties and high production efficiency

Inactive Publication Date: 2007-03-22
ORIENT CHEM INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The present invention has been developed to solve the foregoing problems. It is an object of the present invention to provide a laser-welded article that workpieces prepared simply can be easily unified by laser in one laser welding process without using complicated processes. Moreover, the laser-welded article has sufficient welding strength and excellent appearance, and does not damage the resin property.
[0024] The laser-welded article of the present invention keeps the best of intrinsic properties of the resin used for the molded workpiece because a trace of nigrosine in the laser-transmissible-absorptive molded workpiece of the laser-welded article has sufficient solubility into oil, compatibility for the resin, solubility for the resin and a retardation effect.
[0026] The laser-welded article is simply manufactured without requiring any inconvenient pretreatments for adhering workpieces made from resin or complicated processes such as alloying. This laser-welded article is welded by laser in one laser welding process and therefore has high productive efficiency.
[0027] And adhesive materials or clamps for joining are not used for the laser-welded article. Therefore, the laser-welded article has excellent recycling property.

Problems solved by technology

Therefore, there is a problem that the resin property of the first resin workpiece is easily influenced by the additive.
Also, there are some other problems.
Depending on a sort of the resin and the additive, a separation of layers in the kneading procedure, a deterioration of strength of the welded article, and a restriction of using any resin are caused.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

(1-a) Preparation of Laser-Transmissible-Absorptive Molded Workpiece

[0093] 499.9 g of a fiber-reinforced polyamide 6 resin of catalog No. ZYTEL 73G30L available from Du Pont that ZYTEL is a registered trademark and 0.1 g of nigrosine of catalog No. NUBIAN BLACK PA9801 available from Orient Chemical Industries, Ltd., which contains 0.75% of iron and 1.08% of aniline, and NUBIAN is a registered trademark, were added in a tumbler made of stainless steel and were mixed with stirring for 1 hour. The obtained mixture was molded at 280° C. of temperature of a cylinder and 80° C. of temperature of a metal mold with general procedures using an injection molding machine of catalog No. Si-50, which is available from Toyo Machinery & Metal Co., Ltd. Then a laser-transmissible-absorptive molded workpiece having the length of 80 mm, the width of 50 mm and the thickness of 1 mm was prepared.

(1-b) Preparation of Laser-Absorptive Molded Workpiece

[0094] 499 g of the fiber-reinforced polyamide 6 ...

example 2

(2-a) Preparation of Laser-Transmissible-Absorptive Molded workpiece

[0097] 499.65 g of the fiber-reinforced polyamide 6 resin of catalog No. ZYTEL 73G30L available from Du Pont that ZYTEL is the registered trademark and 0.35 g of nigrosine of catalog No. NUBIAN BLACK PA9801 available from Orient Chemical Industries, Ltd that NUBIAN is the registered trademark were added in a tumbler made of stainless steel and were mixed with stirring for 1 hour. The obtained mixture was molded at 280° C. of temperature of a cylinder and 80° C. of temperature of a metal mold with general procedures using the injection molding machine of catalog No. Si-50, which is available from Toyo Machinery & Metal Co., Ltd. Then a laser-transmissible-absorptive molded workpiece having the length of 80 mm, the width of 50 mm and the thickness of 1 mm was prepared.

(2-b) Preparation of Laser-Absorptive Molded Workpiece

[0098] A laser-absorptive molded workpiece having the length of 80 mm, the width of 50 mm and...

example 3

(3-a) Preparation of Laser-Transmissible-Absorptive Molded Workpiece

[0100] 499.65 g of the fiber-reinforced polyamide 6 resin of catalog No. ZYTEL 73G30L available from Du Pont that ZYTEL is the registered trademark and 0.35 g of nigrosine of catalog No. NUBIAN BLACK PA9803 available from Orient Chemical Industries, Ltd., which contains 0.26% of iron and 0.15% of aniline, and NUBIAN is the registered trademark, were added in a tumbler made of stainless steel and were mixed with stirring for 1 hour. The obtained mixture was molded at 280° C. of temperature of a cylinder and 80° C. of temperature of a metal mold with general procedures using the injection molding machine of catalog No. Si-50, which is available from Toyo Machinery & Metal Co., Ltd. Then a laser-transmissible-absorptive molded workpiece having the length of 80 mm, the width of 50 mm and the thickness of 1 mm was prepared.

(3-b) Preparation of Laser-Absorptive Molded Workpiece

[0101] A laser-absorptive molded workpie...

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Abstract

A laser-welded article comprises: an integral construction of piled workpieces, that are welded by exothermic through irradiating laser and include thermoplastic resin, comprises of a laser-transmissible-absorptive molded workpiece including a thermoplastic resin and 0.001 to 0.3 weight % of colorant consisting of nigrosine which has an absorption coefficient: ε for a ray of 940 nm ranging form 4000 to 7000, that transmits laser partially and absorbs laser partially, and a laser-absorptive molded workpiece including a thermoplastic resin and 0.1 to 5 weight % of diverse colorant comprising of nigrosine and / or carbon black, that absorbs the laser.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to a laser-welded article that a laser-transmissible-absorptive molded workpiece including nigrosine alone as colorant and a laser-absorptive molded workpiece are welded by laser at a time and unified. [0002] For mutually joining workpieces made from a synthetic thermoplastic resin material, a method for laser welding is known. [0003] Such laser welding is executed for example as follows. As shown in FIG. 2, a laser-transmissible workpiece 11 is used for one workpiece and for the other workpiece, a laser-absorptive workpiece 12 is used. These workpieces are then put together. A laser 13 is irradiated from a side of the laser-transmissible workpiece 11 towards the laser-absorptive workpiece 12. And the laser 13 transmitted through the laser-transmissible workpiece 11 is absorbed into the laser-absorptive workpiece 12, and then exothermic is caused thereat. The exothermic melts the laser-absorptive workpiece 12 mainly at a lase...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/16
CPCB29C65/16Y10T428/25B29C65/1635B29C66/14B29C65/1658B29C65/1674B29C65/1677B29C66/1122B29C66/1282B29C66/12841B29C66/43B29C66/73321B29C66/73362B29C66/836B29C65/1616B29C66/73921B29C66/73772B29C66/73776B29K2995/0027B29C66/71B29K2081/04B29K2077/00B29K2069/00B29K2067/00B29K2023/00
Inventor KIHARA, TETSUJIYAMAMOTO, SATOSHI
Owner ORIENT CHEM INDS
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