METHOD OF EAR PLUG MAKING Russian patent published in 2017 - IPC A61F11/08 B29C44/34 B29C44/12 

Abstract RU 2610513 C2

FIELD: individual protection means.

SUBSTANCE: invention relates to hearing protection device production method, such as ear plug inserted by pressing. Method includes steps of: elongated core coating with outer layer containing inactivated foaming agent, their arrangement in mold and activation of foaming agent to form sound absorbing part and foot connected to elongated core. At that, foot average density exceeds sound absorbing part average density.

EFFECT: enabling elimination of labor-intensive and expensive production processes.

22 cl, 13 dwg

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RU 2 610 513 C2

Authors

Endle James P.

Hamer Jeffrey L.

Seville Alan R.

Teeters Kenneth F.

Dates

2017-02-13Published

2013-06-28Filed