One, when the development of the photosensitive slurry off or violent
A, baking time is too long or the temperature is too high
B, the photosensitive paste is too thick or uneven
C. Insufficient exposure time
D, developer concentration is too high or too long
E, photosensitive paste has deteriorated
F, harmful light intrusion
Second, the local pattern does not appear when developing
A. Insufficient blackness of film or reverse film surface
B, baking time is too long or the temperature is too high
C, film and photosensitive paste does not fit closely
D. Exposure time is too long
E, thick coating of photosensitive paste
Third, the photosensitive slurry falls off during etching
A, the photosensitive layer is too thin
B, baking time or temperature is too low
C, the etching water concentration is too high
Source: China Screen Printing Network
School Desk, about 40cm up and down, apply a wider surface. In addition to its function of supporting the lumbar spine, the School Desk also supports the lower half of the thoracic spine. This allows the back and back of the person to be supported. It is more labor-saving, more comfortable than the School Desk, and more economical than the School Desk. There is a 5cm deviation between the measured value and the ideal value, which may not be adjusted.
School Desk
School Desk,Single Desk School Furniture,Double School Desk,Folding School Desk
FENGCHENG SHENKE INDUSTRIES CO.,LTD.LIAONING CHINA , http://www.sk-realia.com