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Industry info Wiki Q&A
Q types of polyester fibers
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RuthDick Release Time: April 25, 2024, 12:36 AM
Choosing between a vinyl or polyester backdrop largely depends on your specific needs and preferences in photography or videography. Vinyl backdrops are known for their durability and resistance to wear and tear, making them ideal for high-traffic environments or situations where they might get dirty, as they can be easily wiped clean. However, they can be bulky and reflect light, potentially causing glare in photos. On the other hand, polyester backdrops are lighter and easier to handle, making them great for on-location shoots. They’re also wrinkle-resistant, which can save time in post-production editing. Polyester backdrops can be washed and are less prone to tears, but they may not stand up to heavy use as well as vinyl. Ultimately, if you need a heavy-duty, easy-to-clean option, go for vinyl. If portability and ease of use are key, choose polyester.
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Q terephthalic acid used in the production of polyester
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BrianPetty Release Time: April 24, 2024, 11:18 PM
Terephthalic acid (TPA) is a crucial compound used in the production of polyester, particularly polyethylene terephthalate (PET). As a dicarboxylic acid, TPA reacts with ethylene glycol through a polymerization process called esterification, forming the polymer PET. This substance is widely recognized for its role in creating fibers for clothing, containers for liquids and foods, and in engineering resins and films. The demand for terephthalic acid has surged due to the versatility, durability, and recyclability of PET products. It’s important to note that while TPA-based polyesters are beneficial in numerous applications, their environmental impact, particularly in terms of plastic pollution, has prompted efforts towards developing recycling methods and exploring bio-based alternatives.
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Q different oil
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SandraPalmer Release Time: April 22, 2024, 6:24 AM
When referring to oil, especially motor oil, the “W” actually denotes “Winter,” not “weight.” The labeling is part of a viscosity rating system devised by the Society of Automotive Engineers (SAE). This system grades motor oil based on its flow at different temperatures. For example, a 10W-30 oil has a viscosity rated at 10 in cold conditions (Winter), which means it flows better at lower temperatures, and 30 at engine operating temperature, indicating its viscosity at higher temperatures. The purpose is to ensure that the oil provides adequate protection across a range of temperatures, improving engine performance and longevity.
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