求翻译，在线等。

Translation:

Causes of poor board surface

Conditions Causes
Off-track board The track is uneven or not parallel
Stuck board Low wind temperature causes tin accumulation at the blowing hole; damaged solder mask causes tin to be deposited on the track surface; too much water in the flux
Scratched green paint The track is crooked and gets scratched by the wall
Thick tin Low wind pressure or gas leakage; large distance between the force distance and the board; too fast ascent speed; low tin temperature or wind temperature
White tin Insufficient corrosion; high tin temperature or too long dipping time; too sticky flux; low copper content in the new trough
Thin tin High wind pressure; too small gap between the wind knife and the board; too slow ascent speed
Tin bulge Low wind temperature; excessive deposition on the knife body; low tin temperature; too short dipping time; debris in the knife; droplets of tin on the board clamp
Flux viscosity property Poor temperature resistance and lubrication of the flux; insufficient coverage of the flux in the trough; insufficient maturity of the green paint
Tin powder or tin tail Copper content is too high due to ineffective copper removal
Uneven tin surface Poor copper surface, insufficient corrosion, too short dipping time, low tin temperature or wind temperature
Tin bridge Copper content is too high; tin temperature is too low; wind temperature is too low
Wavy IC pins Too large force distance; too fast ascent speed; poor lubrication of the flux; low wind pressure
Uneven board Dipping time is too short and the descent speed is too slow
Thin tin at the lower end of the board Too high front knife pressure difference
Small hole or clogged hole Water is trapped in the hole; dipping time is too short; tin slag in the hole
High tin at the back of the hole Dipping time is too short; flux is too sticky
Tin bar on the paint surface The knife edge is too flat, and ascent speed is too fast; poor lubrication of the flux
Large tin surface with white spots Flux oil splashes onto the tin surface
Thick tin drips Tin temperature is too high and dipping time is too long; the knife distance is too large; the knife pressure is too small

These problems can be explained by the following three factors, and changing the operating conditions of each factor can solve the problem:

1. The scraping force of the wind knife on the tin surface:
Factors affecting it: (1) the distance between the knife edge and the board; (2) wind knife pressure; (3) board pulling speed.

2. The flowability of the tin:
Factors affecting it: (1) tin temperature; (2) dipping time; (3) copper content; (4) wind knife temperature; (5) board surface characteristics [copper surface, FRP surface, or green paint surface]; (6) flux lubricity.

3. The adhesion of the board surface:
Factors affecting it: (1) cleanliness of the copper surface; (2) roughness of the copper surface; (3) viscosity or activation characteristics of the flux.