In the cotton spinning process, the performance and effect of a rotary type ring has been compared with those of a conventional type ring. Rotor Spin Ring, the rotary ring developed by our research laboratory, has been put to practical use. Further, dynamic properties of the rotary ring are analyzed theoretically.
The cotton spinning tests show that in using the rotary ring the abrasion of travellers decreases and the yarn quality is roughly equal in comparison with the conventional, but other effects are not confirmed.
A theoretical calculation has shown that the consumption of the electric power in the spinning process with the rotary rings is identical with that of the conventional, if the spinning tension of both types of rings is equal. In practical spinning process, however, the spinning tension of the rotary ring is higher than that of a conventional ring even if travellers of the same count are used. Thus, the rotary rings increase the consumption of electric power.
In conclusions the rotary ring gives littel effect on the cotton spinning process.

View full abstract

The frictional forces between pile yarns and the frictional slider were measured in order to study the frictional mechanism of pile fabrics. The results are as follows. (1) The frictional force F is expressed experimentally by F=f_AY•A+b•W where A is the real contact area between the surface of pile yarns and the surface of the frictional slider, W is the loss energy, and f_AY and b are constants. (2) The relation between the frictional force F and the pressure R is expressed experimentally by F=K₁•R^m+K₂•Rⁿ where K₁, K₂, m and n are constants.

View full abstract

The physical properties of water absorbent porous acrylic fibers related to wearing comfort, i.e., water absorbency, drying, warmth retention, air permeability and frictional property have been compared with those of cotton and other fibers.
An investigation has shown that, compared to regular acrylic fibers, modified water absorbent acrylic fibers: (1) Easily diffuse water and dry. (2) Have a warmth retention intermediate between those of cotton and acrylic fibers. (3) Have difficulty in losing their air permeability even when wet. (4) Don't easily adhere to the skin even when wet.
The unique characteristics of water absorbent acrylic fibers listed above are a remarkable departure from conventional acrylic fibers as well as from other synthetic fibers.
This means an unlimited number of end uses for water absorbent acrylic fibers where moisture absorbing properties are important for comfort or fiber performance.

View full abstract