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Molded foam push-to-fit earplug, method and devices

A technology of earplugs, composition, applied in the field of hearing protection devices, which can solve the problems of difficult manufacturing, expensive, etc.

Inactive Publication Date: 2016-08-24
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although push-fit earplugs exhibit desirable characteristics in a variety of applications, they can be expensive and present difficult manufacturing issues

Method used

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  • Molded foam push-to-fit earplug, method and devices
  • Molded foam push-to-fit earplug, method and devices
  • Molded foam push-to-fit earplug, method and devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0053] The earplugs of embodiments 1 to 3 are used in relation to Figure 4A and 4B The molds prepared during the secondary injection molding process are shown and described. Prepare and dynamically mix using a dynamic high shear mixer at an average rate between 10 revolutions per gram of pumped material and 30 revolutions per gram of pumped material 73.6 parts of Encor 154S acrylic latex material available from Arkema Ltd.; 19.0 parts of water-based pigments available from DAYGLO Color Corporation (DayGlo Color Corporation); and 4.0 parts surfactant cell regulator.

[0054] Molds were prepared by applying H-15-1N mold release agent available from Releasagen Manufacturing Inc and heating the mold to approximately 45°C. The mixed material is dispensed into the sound absorbing portion cavity and the mold top is placed on the mold to provide a vent cavity in the form of the sound absorbing portion. After partial curing, the mold top was removed and replaced with a mold insert...

Embodiment 4-6

[0056] The earplugs of embodiments 4 to 6 are used in relation to Figure 4A and 4B The molds prepared during the secondary injection molding process are shown and described. A dynamic high shear mixer was used to dynamically mix a mixture comprising 39 parts of Mondur PF II available from Bayer at an average rate between 10 revolutions per gram of pumped material and 30 revolutions per gram of pumped material. Isocyanate prepolymer; 50 parts of a blend of polyols comprising ARCOL PPG 425, ARCOL LHT 240 and MULTRANOL 9187 available from Bayer MaterialScience; Materials) NIAX Catalyst A-1, and a blend of BICAT V and BICAT Z available from Shepard Chemical Company, and 3 parts of powder pigment from DAYGLO Color Company; and 7 parts cellular surfactants.

[0057] The mold was prepared by applying a release coating H7228 mold available from Huron Technologies Incorporated and heating the mold to approximately 45°C. The mixed material is dispensed into the rod cavity and the m...

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Abstract

A push-to-fit type earplug including a sound attenuating portion and a semi-rigid stem portion having a relatively greater stiffness than the sound attenuating portion is disclosed. The sound attenuating portion and stem portion are made of a closed-cell, slow- recovery foam.

Description

technical field [0001] This specification relates to hearing protection devices, in particular push-fit earplugs made entirely of closed-cell slow recovery foam. Background technique [0002] The use of hearing protection and noise attenuating devices is well known and various types of devices have been contemplated. Such devices include earplugs and semi-audible devices comprising foam or rubber materials that are inserted into or placed over a user's ear canal to physically block the passage of sound waves into the inner ear. [0003] Compressible or "roll-down" earplugs generally include a compressible, resilient body portion and may be made of a suitable slow recovery foam material. The earplug can be inserted into the user's ear canal by first rolling it between the fingers to compress the body portion, then pushing the body portion into the ear canal, and then allowing the body portion to expand to fill the ear canal. [0004] Push-fit earplugs are also contemplated ...

Claims

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Application Information

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IPC IPC(8): A61F11/08
CPCA61F11/08B29K2075/00A61L31/041A61L31/146B29C44/0461B29C45/1676B29K2033/04B29K2105/046B29K2995/002
Inventor 肯尼思·F·蒂特斯杰弗瑞·L·哈默
Owner 3M INNOVATIVE PROPERTIES CO
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