Finger pressure method and cotton ball blowing method are commonly used to evaluate the drying time of coating or liquid surface. Perbedaannya terutama tercermin dalam prinsip pengujian dan mode operasi:

Finger pressure method:

Digital pressure method is to evaluate the dry time by finger finger pressure coating or liquid surface, feel whether it is still sticky or adhesive feeling. When the coating or liquid surface has no obvious viscosity or adhesion sensation, the surface can be considered to be dry. This method mainly relies on people’s sense of touch and experience, and belongs to subjective evaluation method.

Perbedaan waktu pengeringan antara metode tekanan jari dan metode peniupan bola kapas

Metode meniup bola kapas:

The cotton ball blowing method is to use a blowing tool (such as a blowing pump) untuk meniupkan udara ke permukaan lapisan atau cairan, and observe whether there is adhesion on the surface of the cotton ball to evaluate the drying time. When there is no more adhesion on the surface of the cotton ball, permukaannya bisa dianggap kering. This method is more objective than the shiatsu method and relies on observation and judgment.

Perbedaan antara kedua metode ini terutama terletak pada perbedaan prinsip pengujian dan mode operasi. The acupressure method is mainly based on touch and experience. It needs to judge the dryness of the surface through the feeling of the fingers. The rule of blowing cotton balls is more objective by observing the adhesion of the surface of cotton balls. Both of these methods are relatively simple and fast methods for assessing surface dryness, tapi itu bukan pengukuran yang akurat. They can only provide a general estimate of drying time, yang juga dipengaruhi oleh berbagai faktor, seperti jenis pelapis, suhu sekitar, kelembaban, dll.. For some applications that require high drying time, it may be necessary to use more accurate measurement methods and instruments for the evaluation of table drying time.