A couple of things to check if you haven't already:

Check the tension on both the top thread and the bobbin.
Make sure that there is no lint or stray threads in the bobbin compartment.
Does the bobbin shuttle move once you replace the bobbin?
Is the bobbin in the shuttle correctly, and pulled through the slit on the side?
Have you raised and lowered the needle and pulled the bobbin thread up and pulled a sufficient bobbin thread tail?

Metallic Fibres Used in Many Items

Metallic fibres have made the saying ‘Spinning Straw in Gold’ come to pass. Though straw is never used, its place is rightly taken by other precious metals like silver. Metallic fibres are also known as Zari particularly in India. The most common process for the manufacturing of metallic fibres is the laminating process, which seals an aluminum layer in between polyester or acetate film. These fibres are then cut into lengthwise strips for yarns and wound onto bobbins. The metal can be colored and sealed in a clear film, the adhesives can be colored or the film can be colored. There are many different variations of color and effect that can be made in metallic fibres, producing a wide range of looks

The most common end use for metallic fibres is upholstery fabric and textiles such as Lamé and brocade. Lamés are most commonly made of a polyester jacket, overlain with a thin, interwoven metal, usually steel or copper, which gives them a metallic grayish look. This apparel is popularly used in fencing. Brocade is the special fabric in which colored silk is used woven with silver and gold threads. This exquisite fabric is in great demand throughout Middle East and the Asian regions. Many people also use metallic fibres in weaving and needlepoint.

More commonly today you can find metallic fibres in clothing, anything from party and evening wear to club clothing to everyday wear. The shiny effect that the fibres create has become a symbol of the new millennium. Metallic fibres are also used in places that you may encounter every day.

Stainless steel and other metal fibres are used in communication lines such as phone lines and cable lines. Stainless steel fibres are also used in carpets. They are dispersed throughout the carpet with other fibres so that they are not detected. The presence of the fibres helps to conduct electricity so that the static shock is reduced. These types of carpets are often used in high volume computer areas where the chance of producing static is much greater.

Other uses of Metallic fibre include work clothing such as protective suits, space suits, cut resistant gloves for butchers and other people working near bladed or dangerous machinery.

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