1. The moisture content of the mud material is high or low. If it is too high, it is easy to cause rolling head marks on the forming surface of the green body. If the center of the rolling head coincides with the center of the green body, and the speed ratio is inappropriate, it will also cause the rolling head to be sharp and small. The range of slime forms a depression, and if it is too low, it is easy to produce shock marks.
2. The amount of mud added is too large, the mud discharge is not clear or the first round of mud addition is not full, and the second time mud is added to make too much mud, the mud discharge is not clear, and it is easy to appear rolling marks.
3. If the pressing time is too long or too short, shock marks will easily appear if it is too long, and if it is too short, it will cause rolling marks due to insufficient pressing times and too fast retraction.
4. The pressure is insufficient during molding, or the roller head comes out of the model too suddenly.
5. When the blade is pressurized, the working surface of the blade is worn and the slope is too small.
6. The plaster mold does not match the mold base, too tight or too loose, or the rubber ring of the horizontal seat is too soft.
7. Excessive offset of the center of the rolling head causes the center of the green body to bulge.
8. If the center part of the roller head is not trimmed, it will easily appear sunken. On the contrary, if the correction is excessive and the center length of the roller head is not enough, it will easily appear convex.
9. The quality of the molding equipment is poor, and there will be shock marks if the equipment parts are loose or the bearings are burnt out.