给出了一种连续输出模式的塑料型坯控制方法,能克服塑料型坯在点控制方式下质量差寿命低的缺陷。利用系统的LCD(1iquid crystal display)显示器设定型坯的壁厚曲线,只需增加LCD的分辨率,就可增加型坯壁厚的控制点；在同一LCD的两相邻点,则通过预测曲线的变化趋势给出控制数据,从而增加控制点,增加的点数由D/A转换器的分辨率决定,若分辨率为n,控制点增加2~n-1；整个控制系统的控制点为(LCD水平分辨率-1)×(2~n-1),能满足所有型坯控制器对控制精度的需求。实验数据证明：型坯的壁厚控制曲线是连续的,塑料产品表面光滑、细腻。 A continuous parison control method for plastic parison is presented, which can overcome the defects of poor quality and low life expectancy under the point control mode of plastic parison. Using the liquid crystal display (LCD) display to set the wall thickness curve of the parison, only increasing the resolution of the LCD can increase the control point of the wall thickness of the parison. In two adjacent points on the same LCD, The trend of the curve gives the control data, so as to increase the control points. The added points are determined by the resolution of the D / A converter. If the resolution is n, the control points increase by 2 ~ n-1. The control points of the whole control system are (LCD horizontal resolution -1) × (2 ~ n-1), which can meet the control accuracy requirements of all parison controllers. Experimental data show that: parison wall thickness control curve is continuous, the plastic product surface is smooth and delicate.