The calculation and converting of the formula for punching density of needle punching nonwovens and the usage of the slide rule are introduced, to be favourable for producers to use.
介绍了针刺法非织造有针刺密度的计算公式及其变换，以及计算尺的使用，以利于生产者方便应用。
2
So the machine has many controlling assemblies such as needle selecting, triangle changing, density adjusting, needle bed moving, thread-carrier changing etc.
因而机器有多类控制装置，如选针、三角变换、密度调节、针床横移、导纱器变换装置等。
3
The results show that Widmansttten structure needle consists of many blocky subgrains that have higher dislocation density and subgrain boundary is made up of dislocation tangle.