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Apr 12 - posted by xiu xiu, 1 like, 0 followers, 1 member, 0 comments, 1 viewIn recent years, CIE has released a new technology report, Lighting for the Elderly and Visually Impaired (CIE-277), which analyzes how Led street lights Manufacturers(CLASSIC) ... moreIn recent years, CIE has released a new technology report, Lighting for the Elderly and Visually Impaired (CIE-277), which analyzes how Led street lights Manufacturers(CLASSIC) https://www.classicledlight.com/
have a negative impact on visual function (including vision, contrast sensitivity, view), color perception). And it provides some lighting design solutions for the elderly and low vision people in the office and public lighting environment.
When a person's age is over 45, internal light scattering increases, spatial contrast sensitivity and retinal brightness decrease, and vision will decrease at any time. According to a study by the World Health Organization, more than 285 million people worldwide suffered from visual impairment in 2017, and this situation is getting worse as the problem of aging becomes more serious. This is a problem we cannot ignore.
In the previous report, there was some information on how lighting can damage people's eyesight. They provided some suggestions. However, this report improves these programs related to the current social environment based on current research.
1. Lower ages for older people range from 65 to 50 and increase some lighting requirements in offices and other public areas.
2. Analyze the negative effects of poor lighting on the vision of the elderly and provide some design recommendations primarily for the elderly and low vision.
3. Analyze some design methods in a detailed example.
According to the report, people are older and have a higher proportion of the disease. Therefore, in order to protect the vision and health of the elderly from these bad LED street lights manufacturers, what should be done to pay attention to the lighting design.
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Apr 2 - posted by xiu umin, 1 like, 0 followers, 1 member, 0 comments, 1 viewEssential for good Table Mould(FURNITUREMOULD) https://www.furnituremould.com/product/chair-table-stool-mould/
design for hot manifold operation is to balance the runner system and calculations that... moreEssential for good Table Mould(FURNITUREMOULD) https://www.furnituremould.com/product/chair-table-stool-mould/
design for hot manifold operation is to balance the runner system and calculations that will effectively cool the cavity clusters. Thermal insulation of the thermal manifold is achieved by including an air gap and a minimum contact area between the hot and cold portions of the mould. Double the air gap interval can increase the insulation effect by 8 times. The hot runner plate must not contact the mould part in any way other than the minimum support area necessary to separate the parts.
Through asbestos, glass bonded mica is typically used to minimize heat transfer from hot parts to cold parts. Glass bonded mica is advantageous because it can be ground to absolute flatness and the same parallelism as steel, and it has overall dimensional stability of up to 700 °F. The differential expansion between the hot manifold element and the cooler table mould part must be allowed.
This is typically accomplished by arranging a sliding table mould portion between the manifold plate and the integrated gate plate. The flat floor provides the necessary sliding surface or a cylinder unit can also be used. Certain types of probes or hot tip bushings are used with the ring gate to maintain the temperature at the manifold outlet. The manifold and tip are heated to maintain the barrel temperature in the compound.
The minimum manifold area follows the cavity layout pattern and the manifold is cut into a minimum profile containing the flow channels and heating elements. Basic manifold design considerations include heaters that are parallel to the internal flow channel. Thermocouples that maintain the desired temperature are essential.
Since the hot tips are forwardly indexed by a cavity that is cooler than the manifold, they must move freely to compensate for their different expansions. A positive seal must be maintained between the bushing and the manifold. By sliding in the holes of the spruce bushing or nozzle and in the bore, the hot runner can freely expand in the direction of the fixed end. The slidable end is sealed by a specially designed metal seal.
In some cases, dispensing a wheel set may require an external heating tip from a controlled source, heating the probe, hot gate bushings, and heater castings are important to improve hot manifold forming. By heating the runner tip in the thermal control gate, the melting time is extended and the material does not freeze in the runner. The gate and probe are heated by encapsulation in a cast beryllium copper body or by the use of internal heating elements, and in some cases, thermocouples are also included.
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Mar 14 - posted by xiu umin, 1 like, 0 followers, 1 member, 0 comments, 1 viewThe deformation, bending and twisting of the Table Mould(FURNITUREMOULD) https://www.furnituremould.com/product/chair-table-stool-mould/
are mainly due to the shrinkage rate of the flow direction in... moreThe deformation, bending and twisting of the Table Mould(FURNITUREMOULD) https://www.furnituremould.com/product/chair-table-stool-mould/
are mainly due to the shrinkage rate of the flow direction in the plastic molding process being larger than the shrinkage ratio in the vertical direction, so that the shrinkage ratio of the parts is different and warpage, which is unavoidable in injection molding. There is a large internal stress inside the part to cause warpage, which is a manifestation of deformation caused by high stress orientation. Therefore, fundamentally, the table mould design determines the warpage tendency of the part. It is difficult to suppress this trend by changing the molding conditions. Finally, the problem must be solved from mold design and improvement.
Melted, silvery, cracked polystyrene, transparent part of plexiglass, and sometimes some sparkling filamentous silver can be seen through the light. These silver stripes are also known as spots or cracks. This is because the stress in the vertical direction of the tensile stress is generated, and the weight of the polymer molecule is represented by the difference in the folding ratio of the reoriented orientation and the unoriented portion.
Under normal circumstances, the gloss of the surface of an injection molded part depends mainly on the type of plastic, the colorant and the surface finish of the mold. However, for some other reason, the surface color and gloss defects of the product and the darkness of the surface are often caused.
Due to the intrusion of the insertion holes, the discontinuous flow rate and the area where the filling flow is interrupted, the molten plastic in the cavity meets in multiple strands, and a linear weld is produced because it cannot be completely fused. In addition, in the case of gate injection molding, a welded joint is formed and the strength at the welded joint is poor.
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