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Aprons in the drafting system are, with the top roller cots and the ring travelers, those components having a strong influence on the quality of the yarn and the efficiency of the ring spinning machines.
Increases in output of the ring spinning machines, updated design of components of top weighting arms and nose bars have increased the demands put on aprons considerably. If one considers that over the last 15years the speeds of spindles have increased by about 40%, yet the lifespan of aprons whose working life is defined by the frequency of flexing, has remained practically the same, the improvements in polymer materials are obvious.
Construction Of Aprons
Synthetic rubber, mainly NBR based, is the most widely used material for the manufacture of top and bottom aprons. There are also leather, synthetic leather, PU and PU-coated materials. Synthetic rubber has become a leading material for this purpose because of its long life, a wide range of uses and because of its resistance to fibre finishing additives and abrasion.
A typical rubber compound for the outer or inner layer of an apron contains the base polymer as well as between 10 and 15 different additives, which also affect the various physical and mechanical properties of the various aprons.
Basically, aprons made of synthetic rubber are made in endless tubular form whereas leather or synthetic leather aprons are made open in strips and subsequently glued together to form an apron. The advantage of the tubular construction is the lack of a seam. The apron is uniform along its entire circumference.
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Increases in output of the ring spinning machines, updated design of components of top weighting arms and nose bars have increased the demands put on aprons considerably. If one considers that over the last 15years the speeds of spindles have increased by about 40%, yet the lifespan of aprons whose working life is defined by the frequency of flexing, has remained practically the same, the improvements in polymer materials are obvious.
Construction Of Aprons
Synthetic rubber, mainly NBR based, is the most widely used material for the manufacture of top and bottom aprons. There are also leather, synthetic leather, PU and PU-coated materials. Synthetic rubber has become a leading material for this purpose because of its long life, a wide range of uses and because of its resistance to fibre finishing additives and abrasion.
A typical rubber compound for the outer or inner layer of an apron contains the base polymer as well as between 10 and 15 different additives, which also affect the various physical and mechanical properties of the various aprons.
Basically, aprons made of synthetic rubber are made in endless tubular form whereas leather or synthetic leather aprons are made open in strips and subsequently glued together to form an apron. The advantage of the tubular construction is the lack of a seam. The apron is uniform along its entire circumference.
Continue Reading At..............
Posted in: apron construction,apron machinery,aprons,textile machinery
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