辅音发音的过程（一般分为成阻、持阻、除阻三个阶段）中的开始阶段，即发音过程中阻碍作用的形成，发音器官从静止或其他状态转到发一种辅音时所必需的构成阻碍状态的过程。如发b时，软腭上升，双唇紧闭；发d时，软腭上升，舌尖顶住上齿龈。
特点：风阻小、容尘量大、过滤精度高，可以根据客户需要加工成各种尺寸和形状，适合不同的机型使用。
Features: Low air resistance, large dust containing capacity, high filter precision, able to be processed into various shapes and suitable for different models using.
测试结果表明，加装阻扭件的转杯纱可以适当改善转杯纺的加捻效果，进而适当提高了转杯纱的成纱强力。
It shows that rotor spinning yarn with resistance torque element could improve the twisting effect in rotor spinning yarn, and further improve its strength.
PAM还广泛应用于增稠、稳定胶体、减阻、粘结、成膜、生物医学材料等方面。
PAM is widely used for thickening, stable friction reduction, glues, binding, film, biomedical materials, etc.
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