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Industry info Wiki Q&A
Q how to use williamsburg pigment
MaxineCromwell
BartholomewCook Release Time: June 25, 2024, 7:00 PM
Hot glue can adhere to polyester; however, the effectiveness depends on the application. Polyester, being a synthetic fabric, has a melting point that is relatively high but can still be affected by the hot glue’s temperature. For temporary fixes or crafts where strength isn’t the main concern, hot glue might suffice. But for long-lasting, durable applications, especially in high-stress areas on garments or heavy polyester fabrics, it’s not the most reliable choice. There’s also the risk of damaging the polyester if the glue gun is too hot. If deciding to use hot glue, it’s wise to test on a small, inconspicuous area first. Alternatively, consider other adhesives designed specifically for fabrics, including polyester, for a stronger bond.
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Q what is a low density
BernieDoyle
BartholomewCook Release Time: June 22, 2024, 2:03 PM
The density of sodium hydroxide (NaOH), also known as lye or caustic soda, varies depending on its physical state and concentration. In its pure, solid form, NaOH has a density of about 2.13 g/cm³. However, NaOH is often encountered in solution form, and its density in these solutions can range widely based on the concentration. For example, a 50% (by weight) aqueous solution of NaOH has a density of approximately 1.52 g/cm³. It’s important to note that the density of NaOH solutions increases with concentration, up to a certain point, before decreasing due to the displacement of water molecules. Accurate density values are crucial for industrial applications, where NaOH is used in paper manufacturing, soap making, and water treatment processes, among others.
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Q young’s modulus of polyester fiber
ReginaPritt
BartholomewCook Release Time: June 22, 2024, 10:38 AM
Hamburg (Germany): Sodium Hypochlorite prices continue to ease in March 24 despite the strong fundamentals recorded in the German economy in February after eleven months of downturns in manufacturing. This is also in line with the long-term historical trend, which reflects a slowdown in demand for Sodium Hypochlorite in German markets, and destocking is anticipated throughout FY24 at regular intervals, even if Germany’s manufacturing improves. Supply challenges remain minimal for Sodium Hypochlorite for German suppliers as the industry is largely domestic to Europe. In this context, ChemAnalyst remains pessimistic about the recovery of prices in Q2FY24 despite strong demand from water treatment in the summer months. Sodium Hypochlorite volumes in German markets are expected to slow down in FY24, primarily by 2 to 3% YoY. This slowdown is reflected in easing prices, despite the demand for Sodium Hypochlorite remaining stable in the month of March. With temperatures rising, civil demand ...
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Q how to uninstall with yarn
QuincyMarlowe
BartholomewCook Release Time: June 2, 2024, 12:59 AM
To uninstall Yarn globally, the method depends on how you initially installed it. If you used npm, run `npm uninstall -g yarn` in your terminal. For those who installed Yarn through a package manager for their OS (like apt for Ubuntu or homebrew for macOS), use the respective uninstall command (`sudo apt-get remove yarn` for Debian/Ubuntu or `brew uninstall yarn` for macOS). Always ensure your system’s package list is updated beforehand. It’s also wise to check if any dependencies or projects rely on the global Yarn instance to avoid unexpected issues.
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Q what is undercut in injection molding
PeterWhitehead
BartholomewCook Release Time: May 30, 2024, 10:41 AM
Warpage in injection molding refers to the deformation that occurs when molded parts cool and shrink unevenly, leading to distortion. This issue is principally due to differential cooling rates across the part, which can be exacerbated by non-uniform wall thickness, improper material selection, or incorrect processing parameters (e.g., temperature, injection speed). Warpage not only affects the aesthetic quality of a component but can also impact its functional fit and performance. Mitigation strategies include optimizing mold design, ensuring uniform wall thickness, and fine-tuning processing conditions to achieve more homogeneous cooling and minimize residual stresses.
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Q relative roughness of hdpe pipe
CaesarRhys
BartholomewCook Release Time: May 7, 2024, 2:29 PM
The relative roughness of a High-Density Polyethylene (HDPE) pipe is a measure of its surface texture compared to its internal diameter. This dimensionless quantity is crucial for hydraulic calculations, affecting friction losses and flow rates within the pipe. HDPE pipes are known for their smooth interior surfaces, leading to a relatively low roughness coefficient compared to materials like steel or concrete. Typically, the roughness coefficient (ε) of HDPE pipes ranges from 0.000005 to 0.000007 feet. However, it’s important to note that the actual value can vary based on manufacturing processes, age, and the presence of any deposits or damage inside the pipe. Engineers use this value in conjunction with the pipe diameter in the Darcy-Weisbach equation to calculate energy losses due to friction in the pipe. Given its low roughness, HDPE is often preferred in applications requiring minimal frictional losses and high flow efficiencies.
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Q is polypropylene a pfas
ValerieWhyet
BartholomewCook Release Time: May 4, 2024, 12:27 PM
Polypropylene is not a PFAS (Per- and polyfluoroalkyl substances). PFAS are a group of man-made chemicals that include PFOA, PFOS, GenX, and many other substances. These chemicals are known for their resistance to heat, water, and oil. They are used in a wide range of products, from non-stick cookware to waterproof clothing and firefighting foams. On the other hand, polypropylene is a type of plastic, specifically a polymer, used widely in packaging, textiles, automotive parts, and reusable containers. It is favored for its durability, resistance to chemical solvents, bases, and acids. Unlike PFAS, polypropylene does not contain the same fluorine-carbon bonds that give PFAS their persistent and bioaccumulative properties. Thus, while both are used in a variety of applications for their resistant properties, they are chemically distinct materials with different uses and implications for health and the environment.
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Q china epdm injection molding supplier
AbbottGregory
BartholomewCook Release Time: April 30, 2024, 12:32 PM
China is known for its robust manufacturing sector, which includes the production of EVA (Ethylene Vinyl Acetate) injection molding machines. These machines are crucial for creating various products, from sports equipment to automotive parts, due to EVA’s flexibility, resilience, and rubber-like softness. Suppliers in China offer a wide range of machines with varying capacities, functionalities, and automation levels to cater to diverse manufacturing needs. When choosing a supplier, it’s imperative to consider their reputation, after-sales service, and the technical specifications of their machines. Additionally, conducting factory visits and securing quality assurance commitments can ensure you select a reliable partner for your EVA injection molding needs. Opting for suppliers with experience and a strong export record can also smooth out the process of integrating the machinery into your production line.
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