Upload
angrau
View
30
Download
1
Tags:
Embed Size (px)
Citation preview
With the changes in the actual regain of textiles, there are changes in the weight of the material which affect the count and strength of material. If the actual regain of the specimen in known, it is possible to calculate the count and strength corrected in the standard regain.
Corrected Count
The count of yarn corrected to the standard regain is known as corrected count of the yarn.
If N is the count of the yarn at the actual regain Ra (Regain at the time of testing) and Rs, is the standard regain, then
N (100 + Ra)Corrected count Nc = ------------------
100+RsThe above formula is used for indirect system of yarn numbering.
For direct system of the yarn count, the following formula is used. N (100+Rs)
Corrected count Nc = ------------------ 100 + Ra
CORRELATION OF YARN COUNT AND STRENGTH FOR HUMIDITY CHANGES
1. Gravimetric Method2. Chemical Method3. Dew point Method
Methods to measure the Relative Humidity
1. Hair hygrometer or Thermo Hygrograph2. Electrolytic Hygrometer3. Wet and dry bulb Hygrometer
Instruments Used to measure Relative Humidity
Thermo Hygrometer
A - chart B – Pen arm
C – Pen D – Bi-Metalical helical coil
E – Band of human hair
E
D