Question

Определите,какие виды волокон относятся к натуральной группе:1)вискозные 2)растительные 3)животные 4)минеральныекакие свойства ткани являются технологическими?а)Осыпаемость б)Пылеёмкость в)Усадка г)СминаемостьКаким должно быть расстояние о глаз до обрабатываемого предмета (1)20/25 см (2)20/30 (3)30/40 (4)35/45

Answer 1

1.) 2, 3, 4.
2.)1, 3.
3) 2.

Answer 2

Types of Natural Fibers:

1) Viscose fibers are considered natural fibers. Viscose is a type of rayon made from regenerated cellulose fibers derived from wood pulp or cotton linters [[1]]. 2) Plant fibers, such as cotton, linen, jute, and hemp, are also classified as natural fibers [[2]]. 3) Animal fibers, including wool and silk, are another category of natural fibers [[3]]. 4) Mineral fibers, such as asbestos, are not considered natural fibers as they are derived from minerals rather than organic sources [[4]].

Technological Properties of Fabrics:

Technological properties of fabrics refer to their performance characteristics and how they behave during various processes. The properties you mentioned are as follows:

a) Fluffiness or looseness refers to the tendency of a fabric to shed fibers or particles. This can be measured by the amount of lint or loose fibers that come off the fabric. It is an important property to consider for fabrics used in applications where shedding can be a problem, such as cleanrooms or medical environments.

b) Dustiness or dust-holding capacity refers to the ability of a fabric to attract and retain dust particles. Fabrics with high dust-holding capacity are often used in applications where dust control is important, such as air filters or cleaning cloths.

c) Shrinkage is the change in dimensions of a fabric when subjected to heat or moisture. It is expressed as a percentage of the original size. Shrinkage can be a critical property to consider for fabrics that need to maintain their shape and size, such as garments or upholstery.

d) Crushability or compressibility refers to the ability of a fabric to be easily deformed or crushed under pressure. Fabrics with high crushability are often used in applications where a soft and pliable texture is desired, such as bedding or upholstery.

Distance from Eyes to the Object:

The distance from the eyes to the object being viewed is an important factor in determining the optimal viewing distance for comfort and clarity. The options you provided are expressed as fractions, so let's convert them to decimal form:

1) 20/25 cm: This is approximately 0.8 meters. 2) 20/30 cm: This is approximately 0.67 meters. 3) 30/40 cm: This is approximately 0.75 meters. 4) 35/45 cm: This is approximately 0.78 meters.

The recommended viewing distance can vary depending on the specific task and individual preferences. However, a commonly recommended distance for general reading or computer work is around 50-70 centimeters (or 20-28 inches) from the eyes to the object being viewed. This distance allows for comfortable focusing and reduces eye strain.