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Application of environmental protection type leadless welding in PTC thermistor manufacturing

A thermistor, lead-free welding technology, applied in resistors with positive temperature coefficient, welding media, manufacturing tools, etc., can solve the problems of outdated production process, unfavorable environmental protection, health hazards of operators, etc. Stable performance, ensuring the effect of health and safety

Inactive Publication Date: 2009-05-06
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual soldering process has a certain amount of lead, which is not conducive to environmental protection. At present, manual operations are generally used in China, and the solder is (Sn60% / Pb40%). The production process is old and the product consistency is poor. It is harmful to the workshop environment and the entire workshop. There are certain hazards to the health of operators, and it does not meet the supply requirements of Europe, the United States, Japan and other countries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The application of environmentally friendly lead-free soldering in the manufacture of PTC thermistors is the introduction of lead-free soldering processes in the manufacture of polymer PTC thermistors. This polymer PTC thermistor is formed by the following processes:

[0010] (1) The high molecular polymer, conductive powder and inorganic non-conductive powder plus various additives are melted and mixed into a core material through a mixing mixer and an open mixer.

[0011] (2) The metal foil is laminated on both sides of the core material by a press, and punched into chips of various specifications and sizes by a punch.

[0012] (3) Tin-plated copper wire is used as an electrode, and through an automatic welding device: a) Automatically apply flux, such as stainless steel flux; b) Move forward at an even speed at 60°C and keep warm for 2 minutes; c) Automatically enter welding device, and keep it in a constant temperature lead-free tin bath at 295°C for 2 to 3 seconds ...

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Abstract

The invention relates to an application of environmental-protection lead-free welding in making PTC thermosensitive resistors, taking green and environmental protection as the theme, in the course of making high-molecular PTC thermosenstitive resistors, adopting an environmental-protection lead-free welding method to effectively improve the PTC thermosensitive resistor products so as to make them lead-free, and enhance welding reliability and product properties. The property consistency of the high-molecular PTC thermosenstitive resistors like current resistance, voltage resistance, resistance, etc. is more perfect on the original basis and their properties accord with 'Environment and Air Quality Standard' GB3096-1996 of National Industry and Enterprise Design.

Description

Technical field [0001] The application of environment-friendly lead-free soldering in the manufacture of PTC thermistors of the present invention takes green environmental protection as the theme. In the manufacturing process of polymer PTC thermistors, by adopting the method of environment-friendly lead-free soldering, the PTC can be effectively improved. Thermistor products do not contain the toxic element "lead". Background technique [0002] Polymer PTC thermistors are widely used in many fields such as household appliances, computers, automobiles, communications, industrial control, etc. The manufacturing method of polymer PTC thermistors consists of polymer matrix, conductive powder and various additives. After the thin sheet-shaped core material is made by kneading and extrusion at a certain temperature by the mixing equipment, the metal foil and the core material are combined together, punched into a certain shape by a punching machine, and used as a core material by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02B23K35/22
Inventor 朱国培杨兆国
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD