Heavy-duty mechanical sewing machines are built with robust materials and components. They often feature a metal frame that provides stability and reduces vibrations during operation, ensuring precise stitches. The heavy-duty presser foot is another key element; it exerts more pressure on the fabric, allowing for smooth feeding of multiple layers and thicker materials without skipping stitches. These machines typically come with a range of stitch options, including straight stitch, zigzag, and specialized stitches like bar tacks, which are frequently needed in heavy sewing projects.

What is a Double Needle Walking Foot Sewing Machine?

One of the advantages of chain stitch sewing is its durability. The stitch tends to hold up well under stress and strain, which is why it is commonly used in heavy-duty applications like upholstery and canvas. However, it is important to note that while chain stitches offer flexibility and durability, they can be more susceptible to unraveling compared to locked stitches. This means that careful handling and proper finishing techniques, such as backstitching or knotting, are vital to ensuring the longevity of the seams.

A double needle consists of two needles mounted on a single shank, allowing for intricate stitching patterns that would be difficult, if not impossible, to achieve with a single needle. These needles are typically used with a sewing machine and are available in various sizes, widths, and types, making them incredibly versatile for different sewing projects. The most common widths are 1/4 inch and 1/8 inch, but specialty needles can offer even more options.

Overall, the Food Directorate's comprehensive review of the available science of TiO₂ as a food additive showed:

1.Mainly used in latex paints, water-based paints, inks, rubber, plastics, etc., replacing 30% of rutile-type titanium dioxide in latex paints, still maintaining the original film properties, and has the effect of reducing costs.