KamaBack - TDD-Global

Q polyester wadding thickness

KamaBack Release Time: June 25, 2024, 11:03 AM

The weight of 70d (denier) polyester depends on the type of polyester fabric and its application. Denier measures the linear mass density of fibers and indicates how thick the fibers are. For 70d polyester, this means 70 grams per 9,000 meters of the yarn. Generally, 70d polyester is considered a lightweight fabric, commonly used in the manufacturing of lightweight apparel, linings, and outdoor gear like sleeping bags and tents. The actual fabric weight, however, will vary based on the weave or knit, finish, and any treatments applied to the material. For example, a 70d polyester fabric used in a rain jacket may have additional coatings, making it slightly heavier than an uncoated 70d fabric used for a lightweight summer garment.

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Q how to breakup hard fibers in lymphedemic arm

MortonHenrietta

KamaBack Release Time: June 19, 2024, 8:03 AM

Calcining glass fibers involves heating them to a temperature below their melting point to remove moisture, organic materials, or other volatile components. This process enhances their thermal stability and mechanical properties. Typically, glass fibers are fed into a calcination kiln, where they are exposed to temperatures ranging from 500°C to 800°C, depending on the specific type of glass and the desired properties. The duration of calcination can vary, but it is crucial to ensure uniform heat distribution to prevent damage to the fibers. Factors like airflow, temperature uniformity, and kiln design play significant roles in achieving optimal results. Post-calcination, the fibers undergo cooling before further processing or application. This step is essential in applications requiring high-temperature resistance or reduced chemical reactivity in the glass fibers.

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Q does spandex have metal fibers

GuyRudolph

KamaBack Release Time: June 19, 2024, 4:24 AM

The enteric nervous system (ENS) primarily governs the function of the gastrointestinal tract and operates with considerable autonomy. It is embedded in the lining of the gastrointestinal system and contains millions of neurons. Despite its significant degree of independence, the ENS has considerable bidirectional interaction with the central nervous system (CNS), primarily through the autonomic nervous system (ANS) components, including the sympathetic and parasympathetic nervous systems. Connections between the ENS and brainstem occur via the vagus nerve for parasympathetic outflows and through prevertebral ganglia for sympathetic inputs. However, the ENS itself does not contain fibers directly within the brainstem. Instead, it sends and receives signals from the CNS using the pathways mentioned, allowing for coordinated regulation of digestive functions. This link comprises a critical part of the “brain-gut axis,” enabling the central and enteric nervous systems to affec...

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Q is polypropylene fda approved

RenataHume

KamaBack Release Time: May 29, 2024, 3:51 PM

Yes, polypropylene (PP) is FDA-approved for use in food contact applications. This thermoplastic polymer is considered safe for food packaging, containers, utensils, and other kitchenware due to its resistance to heat, chemicals, and fats. The FDA’s approval is based on rigorous safety evaluations to ensure that materials in direct contact with food do not leach harmful substances under normal use conditions. Polypropylene’s approval is documented in the Code of Federal Regulations (CFR), specifically in Title 21, highlighting its suitability for single-use and reusable food-related products. This makes PP a popular choice in both household and commercial settings for food storage and preparation solutions.

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Q cast iron pipe sizes chart

RockRudolph

KamaBack Release Time: May 20, 2024, 5:54 PM

When connecting galvanized pipe to PVC, it’s crucial to use the right method to ensure a secure and leak-free joint. One common technique involves using a dielectric union, designed to connect pipes made from different materials while preventing galvanic corrosion, a type of corrosion that occurs when dissimilar metals are in contact in the presence of an electrolyte. The union comprises two components, one with female threads that connect to the galvanized pipe and another with male threads to attach to a PVC adapter. Apply thread tape or pipe dope on the galvanized threads before screwing on the union for a better seal. After securing the union, glue the PVC pipe to the PVC adapter using PVC cement. This method ensures a reliable connection while mitigating corrosion risks, making it a recommended approach for DIYers and professionals alike.

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Q easy pipe cleaner crafts

HughLawrence

KamaBack Release Time: May 10, 2024, 6:24 AM

ABS (Acrylonitrile Butadiene Styrene) and PVC (Polyvinyl Chloride) pipes are both used in plumbing systems, but they have distinct differences. ABS is known for its durability, excellent impact resistance, and its ability to perform well in low temperatures, making it suitable for outdoor applications. However, it is susceptible to degradation from direct sunlight unless it’s properly protected. PVC, on the other hand, is more flexible than ABS and has a higher resistance to chemical erosion. It is preferred for indoor plumbing, especially for cold water supply and waste drain lines, due to its chemical resistance and easier handling. PVC pipes also offer better sound insulation than ABS pipes. However, PVC can become brittle in cold temperatures. Local building codes may favor one material over the other, so it’s important to check regulations before making a decision. In terms of cost, ABS generally tends to be slightly cheaper than PVC, but prices can vary depending on t...

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Q joining hdpe pipe

LilithDickey

KamaBack Release Time: May 7, 2024, 1:54 PM

Joining HDPE (High-Density Polyethylene) pipe commonly involves heat fusion methods, ensuring a leak-proof and durable connection. The two primary techniques include Butt Fusion and Electrofusion. Butt Fusion involves heating the pipe ends and pressing them together, creating a consistent and strong joint. On the other hand, Electrofusion employs a special electrically conductive fitting, heating the pipe and the fitting simultaneously to bond them. Both methods require clean, prepared surfaces and precise temperature control for optimal results. Mechanical methods such as Flange or Mechanical Joint adapters are alternatives but might not offer the same level of integrity. The choice between these methods depends on the specific requirements of the project, including pipe size, application, and accessibility.

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Q creep behavior of polypropylene

AliceYoung

KamaBack Release Time: May 7, 2024, 11:00 AM

Creep behavior is a key consideration in the application and design of products made from polypropylene (PP), a widely used thermoplastic polymer. Creep refers to the tendency of a material to deform under sustained load over time. Polypropylene, recognized for its versatility and cost-effectiveness, exhibits creep behavior that is influenced by various factors such as temperature, applied stress, and the presence of any additives. At room temperature, PP may show minimal creep under low stress, but at elevated temperatures or higher stress levels, the material can experience significant deformation. The molecular structure of PP, including its crystallinity and the orientation of its polymer chains, plays a critical role in its creep resistance. Enhancements in creep resistance can be achieved through the addition of fillers, reinforcement with fibers, or through polymer blending. Designers and engineers need to account for creep behavior in the selection and application of polypropyl...

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Q define yarn over

AugustAmelia

KamaBack Release Time: May 1, 2024, 3:17 PM

The diameter of yarn is a critical measurement impacting the weight, strength, and usability of the yarn in various textile applications. Typically measured in micrometers (µm) or sometimes in deniers for synthetic fibers, the diameter influences the yarn’s fineness or coarseness, affecting how it will perform in knitting, weaving, or other textile crafts. Natural fibers like cotton, wool, and silk have varying diameters influenced by their source, quality, and processing methods. For instance, fine Merino wool can have a diameter as low as 17 µm, while coarse wool may exceed 35 µm. Synthetic fibers can be manufactured to specific diameters based on end-use requirements. Understanding and choosing the right yarn diameter is essential for achieving the desired fabric feel, strength, and appearance.

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Q shein of yarn

ByronWhittier

KamaBack Release Time: May 1, 2024, 3:03 PM

Slub yarn is a type of yarn characterized by its intentional irregularities and thicker sections at intervals along its length. These variations are created through the spinning process, with the aim of producing a more textured and visually distinctive fabric once woven or knitted. Historically, slubs were seen as imperfections, but over time they’ve been embraced for their aesthetic appeal, adding a rustic or handmade quality to textiles. Slub yarns are used in a variety of fabrics, from lightweight linens to chunky knitwear, offering designers a tool to add depth and interest to their creations.

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