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34results about How to "Improve environmental reliability" patented technology

Selective sintering process of printed circuit

The invention discloses a selective sintering process of a printed circuit. A non-conducting material is selected for manufacturing a base material; the surface of the base material is covered with conducting ink through a printing process; the base material covered with the conducting ink is placed aside so as to remove a solvent in the conducting ink after the conducting ink is dried, or the base material covered with the conducting ink is placed in a baking furnace to be baked at a temperature lower than the softening temperature or denaturation temperature of the base material so as to remove the solvent in the conducting ink; induction heating equipment is used for carrying out induction heating on the base material which has been dried or baked at the low temperature, namely, the base material which has been dried or baked at the low temperature is placed near an induction coil, an electric induction furnace of a specific frequency is selected according to the base material and the conducting ink material, power is adjusted, heating time is set, and heating is carried out; after heating is completed, the printed circuit product can be obtained. By means of the process, selective heating of the printed circuit is achieved, namely, heating is only carried out on the conducting material but not the non-conducting base material, and therefore high-temperature sintering of the printed circuit is achieved, and good electric conductivity is achieved.
Owner:XIAMEN PINGDA TRADING CO LTD

Low-resistance high-reproducibility PTC over-current protection element

The invention relates to a low-resistance high-reproducibility PTC over-current protection element, which has a function of effectively improving the environmental reliability of a product and is a low-resistance surface-mounted polymer PTC over-current protection element mainly made of a polymer PTC composite sheet and having excellent environmental stability. The side surface of theprotection element, or the side surface and the front surface of the protection element is provided with a coating layer or a plating layer, so that the conductive composite material base layer is isolated from the external environment. The low-resistance high-reproducibility PTC over-current protection element has the following characteristics that 1, any combination surface of the four side surfaces of the element is coated with a coating layer or a plating layer, and one front surface can be coated with or not coated with the coating layer, so that the polymer PTC composite sheet of the element is isolated from the environment, and the resistance reproducibility of the product is improved; 2, the conductive holes playing a role in electrical connection are positioned on two sides of the element, so that the element has good welding performance; and 3, the structure of the existing product is not changed, and the existing assembly mode can be completely adopted.
Owner:SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD

High-precision circuit board and manufacturing method thereof

The invention discloses a high-precision circuit board and a manufacturing method thereof. The circuit board comprises a supporting bottom plate and a conductive circuit arranged on the supporting bottom plate, the supporting bottom plate is a polyimide film formed on a flat glass mother plate; the conductive circuit is a metal layer, the metal layer is provided with a pattern corresponding to theconductive circuit, and the forming conditions of the metal layer comprise that the supporting bottom plate is located on the flat glass mother plate, the metal layer is deposited on the supporting bottom plate in a magnetron sputtering mode, and the metal layer forms a pattern corresponding to the conductive circuit through a photoetching process. The polyimide film is formed on the flat glass mother board to serve as the supporting bottom plate, the supporting base plate is flatter and smoother, when the supporting base plate is located on the flat glass mother plate, the metal layer with very high uniformity is plated on the supporting base plate in the magnetron sputtering mode, the circuit precision can reach the level of 10 micrometers or above through patterning of the photoetchingprocess, and the circuit density can also be remarkably improved.
Owner:SHANTOU GOWORLD DISPLAY TECH CO LTD +1

Thermal power generating unit and denitration control method and system based on NH3 measurement

The invention discloses a denitration control method based on NH3 measurement. The denitration control method comprises the following steps: acquiring NH3 measurement values of a plurality of measurement points in a flue, controlling an ammonia spraying amount of an area corresponding to the flue according to the NH3 measurement value, calculating a PID feedforward value according to a preset broken line function, and controlling an NOx concentration of a denitration outlet according to the PID feedforward value. The invention further discloses a denitration control system based on NH3 measurement and a thermal power generating unit comprising the denitration control system based on NH3 measurement. According to the denitration control method based on NH3 measurement, through multi-measuring-point NH3 parameter monitoring, a basis can be provided for an operator to adjust the opening degree of the ammonia spraying valve, so that the ammonia spraying amount of each area is more reasonable, the problem of excessive spraying or insufficient spraying of NH3 is effectively prevented, and the occurrence of blockage of an air preheater can be effectively reduced, meanwhile, the PID feedforward value is introduced into the denitration control system, so that the control reliability of the denitration control system can be effectively improved, and the environmental protection reliability is improved.
Owner:华润电力技术研究院有限公司

Thermal power units and their nh-based 3 Measured denitrification control method and system

The invention discloses a NH-based 3 Measured denitrification control method, including: obtaining NH at several measuring points in the flue 3 measured value; according to the NH 3 The measured value controls the amount of ammonia injection in the corresponding area of ​​the flue; the PID feedforward value is calculated according to the preset broken line function; the NOx concentration at the denitrification outlet is controlled according to the PID feedforward value. The invention also discloses a NH-based 3 Measurement of the denitrification control system and including the above NH-based 3 Measurement of the denitrification control system of the thermal power unit. The above is based on NH 3 Measured denitrification control method through multi-measuring point NH 3 Parameter monitoring can provide operators with a basis for adjusting the opening of the ammonia injection valve, making the amount of ammonia injection in each area more reasonable and effectively preventing NH 3 The problem of overspray or underspray can effectively reduce the occurrence of air preheater clogging; at the same time, by introducing the PID feedforward value into the denitration control system, the reliability of the denitration control system can be effectively improved, and the reliability of environmental protection can be improved.
Owner:华润电力技术研究院有限公司
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