Process variable

About: Process variable is a research topic. Over the lifetime, 3983 publications have been published within this topic receiving 43130 citations. The topic is also known as: process parameter.

Icephobic Behaviour and Thermal Stability of Flame-Sprayed Polyethylene Coating: The Effect of Process Parameters

Abstract: The present work investigates the effect of different process parameters on the production of low-density polyethylene (LDPE) coatings by flame spray technology. Previously, flame spraying of polymers has been successfully performed to obtain durable icephobic coatings, providing an interesting solution for applications facing icing problems, e.g. in marine, aviation, energy, and transportation industry. However, the fine tailoring of the process parameters represents a necessary strategy for optimising the coating production due to the unique thermal properties of each polymer. For this purpose, we vary the heat input of the process during flame spraying of the coating, by changing the transverse speed and the spraying distance. The results show that the variation in the process parameters strongly influenced the quality of the polymer coating, including its areal roughness, thickness, chemical composition, thermal stability, and degree of crystallinity. Furthermore, we demonstrate that these properties significantly affect the icephobic behaviour of the surface within the spray window of the chosen parameters. In conclusion, the relationship between the thermal degradation of the polymer and the icephobicity of the surface was defined. This highlights the importance of process parameter optimisation in order to achieve the desired icephobic performance of the LPDE coatings.

Method and system to create process parameter, and manufacturing method of semiconductor

Abstract: PROBLEM TO BE SOLVED: To provide a process parameter creating method that can obtain a desired pattern. SOLUTION: The method has a step to prepare a parameter group containing a plurality of process parameters, a step to obtain a second pattern by correcting the first parameters on the basis of the parameter group, a step to forecast a third pattern to be formed on a semiconductor substrate by etching on the basis of the parameter group and the second parameters, a step to obtain an evaluation result by comparing the third pattern and the first pattern, a step to determine if the evaluation result satisfies a predetermined condition, a step, if not, to return to the step to correct the first pattern by correcting the process parameters in the parameter group, and a step, if satisfied, to decide the process parameters in the parameter group as the final process parameters. COPYRIGHT: (C)2004,JPO

Method for controlling surface temperature in homoepitaxial growth of monocrystal diamond

Abstract: The invention discloses a method for controlling surface temperature in homoepitaxial growth of monocrystal diamond, belongs to the technical field of crystal growth and aims to solve the problem that the surface temperature of seed crystals in MWCVD growth systems in the prior art is difficultly and effectively regulated. The method comprises the following steps: washing diamond seed crystals, welding, selecting heat insulation wires, manufacturing heat insulation wires, placing samples, making preparations for growing and growing diamond. By virtue of the method for controlling surface temperature in homoepitaxial growth of monocrystal diamond, the heat insulation wires are prepared, thereby ensuring that the surface temperature of diamond samples is not excessively low because of excessively high heat conduction speed; different-sized heat insulation wires are selected according to different process parameters, so that the surface temperature of the diamond samples can be controlled; the diamond grows under the process parameter such as the temperature; by virtue of special shapes of the heat insulation wires, the horizontal surfaces of the diamond samples are ensured; the diamond samples are in uniform contact with plasma spheres; the uniformity of the temperature field and the uniformity of carbon source density can be ensured; and the growth effect is relatively excellent.

Materiel tracking system of ERW welded pipe product line

Abstract: The present invention relates to a material tracking method in manufacturing process of ERW welding tube. In the manufacturing process of ERW welding tube, all production processes from raw material hot rolling bending, longitudinal shearing strips, ERW tube welding, fine-finishing after welding, wholly quenching and tempering, tube processing, etc. are executed with material welding. In the processes realized with material tracking, the facilities of bar code printing and scanning, on-line jet printing, automatic generating of sequence number of steel tube, pipe end lettering, steel tube data collecting, production management, etc. are used for recording, coding, identifying, marking and controlling each procedure in the production process of welding tube from raw material to finished tube for obtaining effectively recording main parameter of each unit assembly of each steel tube in the production process, matching with a nondestructive flow detection device for recording and marking the defect existing in the raw material, half-finished product and finished product, thereby realizing the tracking to the production process of each steel tube. The analysis to reason for the generation of defective product, the time, the personnel of production group and the contemporary process parameter can be realized. The problem can be found and settled in time. The production management and examination are facilitated.