Drafting device suitable for spinning by spun-bond process

The invention provides a drafting device suitable for spinning by a spun-bond process. The drafting device comprises an airflow collecting section, an airflow accelerating section and an airflow leveling section which are sequentially divided from top to bottom, wherein internal inclination angles of the airflow collecting section and the airflow accelerating section are fixed, and the size distance of an inlet of the airflow accelerating section can be adjusted by an adjusting device. The tows in the closed drafting device can be driven to be continuously accelerated and stretched in an air duct through an accelerating effect of the airflow, thereby obtaining the tows meeting with the use conditions and having better mechanical property. 本发明提供一种适用于纺粘法纺丝的牵伸装置，包括由上自下依次分成的气流汇集段、气流加速段、气流匀整段，气流汇集段、气流加速段的内部倾斜角度固定不变，气流加速段的入口尺寸距离能够通过调整装置进行调整。本发明是让丝束在封闭式牵伸装置中，通过气流的加速效果带动丝束在风道中不断加速、拉伸，从而得到符合使用条件的、具备较好机械性能的丝束。