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Doily yarn is often referred to as crochet thread or lace yarn, depending on its thickness and application. Crochet thread is a fine, silky yarn typically made from cotton or a blend of synthetic fibers, ideal for crafting delicate doilies, tablecloths, and other decorative items. It is graded by size, with higher numbers indicating thinner thread. Lace yarn, while similar, can be slightly thicker and may be used for both doilies and lightweight shawls or garments. Both types offer a variety of colors and textures, allowing for intricate and detailed work.
Tolerances for plastic injection molded parts largely depend on the dimensions of the parts and the type of plastic used. Typically, they range from ±0.127mm (±0.005 inches) for small or standard parts with non-critical dimensions, up to ±0.5mm (±0.020 inches) for larger parts. Various factors such as the material's shrinkage rate, the complexity of the parts, and the type of features being molded (such as holes, walls, and snaps) can influence the achievable tolerances. Advanced materials and high-precision molding techniques can achieve tighter tolerances, but they may increase the cost. It's also important for engineers and designers to work closely with the molding specialists to understand the limitations and adjust designs or expectations accordingly. Optimizing part design for the injection molding process and selecting the appropriate material are crucial steps for successfully achieving the desired tolerances.
Resin 7, in the context of recycling, refers to a category of plastic not included in the first six resin types identified by the Resin Identification Coding System. Resin code 7 stands for "other" plastics made from a variety of materials that don't fit into the first six categories. This can include polycarbonate, polyactide, acrylic, acrylonitrile butadiene, styrene, fiberglass, and nylon among others. Many of these plastics are difficult to recycle due to their composition, reducing the likelihood of them being accepted at standard recycling facilities. Products made from resin 7 are diverse, ranging from bullet-proof materials to baby bottles, DVDs, and sunglasses. Due to the potential inclusion of BPA in some resin 7 plastics, there has been growing concern over their safety in consumer products. As recycling technologies advance, there is hope for improved recycling solutions for these types of plastics.
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