Face mask

• US 4,850,347 A
• Filed: 03/20/1987
• Issued: 07/25/1989
• Est. Priority Date: 06/09/1980
• Status: Expired due to Term

• Current Assignee: Moldex-Metric Incorporated
• Original Assignee: Metric Products, Inc.
• Inventors: Skov, Martin R.
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): REICHLE, KARIN M
• Application Number:
  US07/028,308
• Time in Patent Office: 858 Days
• Field of Search: 128/206.12, 128/206.17, 128/206.19, 128/206.24, 128/205.29, 128/205.27, 128/205.28, 55/495, 55/502, 55/514, 55/DIG. 5, 264/257, 264/258, 264/DIG. 48, 425/500, 425/503, 425/506, 425/507, 425/508, 425/509, 425/520, 425/521, 425/816
• US Class Current: 128/206.16
• CPC Class Codes: A41D 13/1146 obtained by moulding

Abstract

A face mask to be worn upon the face of a wearer and for providing filtering of particular impurities in the air, including at least one layer of flexible plastic material molded generally to conform to the contours of the face of the wearer and forming a flexible support carrier for filter material and with the one layer formed of openwork flexible plastic material for providing a plurality of perforations through the first layer for allowing the free passage of air through the one layer, and a separate layer of filter material supported by the one layer of flexible plastic material and with the filter material filtering out the particular impurities in the air.

Claims

1. A method of making a face mask to be worn upon the face of a wearer and for providing filtering including the following steps,

providing at least one layer of flexible plastic material formed from openwork flexible plastic material for providing a plurality of perforations for allowing for the free passage of air through the openwork plastic,

providing a layer of filter material for filtering impurities in the air,

providing male and female molding members having a mold configuration conforming generally to the contours of the face of the wearer,

maintaining the molding members at a cold temperature,

preheating the at least one layer of openwork flexible plastic material to a hot temperature sufficient to mold the plastic material to a desired configuration,

moving the preheated layer of openwork flexible plastic material and the layer of filter material between the cold male and female molding members, and

pressing the male and female molding members together to form the face mask to the desired configuration by molding the at least one layer of openwork flexible plastic material to form a support layer to carry the layer of filter material while at the same time cooling the preheated layer of openwork flexible plastic material sufficiently so as not to damage the layer of filter material.

2. The method of claim 1 wherein two layers of openwork flexible plastic material are provided and preheated and wherein the layer of filter material is sandwiched between the layers of openwork flexible plastic when the male and female molding members are pressed together.

3. The method of claim 2 additionally including the step of providing a layer of soft fabric and moving the layer of soft fabric between the molding members at a position intermediate the male molding member and one of the two layers of open work flexible plastic material for covering the inner surface of the face mask.

4. The method of claim 2 additionally including the step of heating the peripheral edges of the layers of openwork flexible plastic to seal the peripheral edge of the face mask.

5. The method of claim 2 additionally including the step of precutting the layer of filter material to a particular configuration and the layers of openwork flexible plastic molded to extend past the periphery of the filter material.

6. The method of claim 5 additionally including the step of bonding the peripheral edges of the layers of openwork flexible plastic material together at a position past the periphery of the filter material to form a bead.

7. The method of claim 2 additionally including the step of attaching a gasket around the peripheral edge of the face mask.

8. The method of claim 1 additionally including the step of providing a layer of soft fabric and moving the layer of soft fabric between the molding members at a position intermediate the male molding member and the filter material for covering the inner surface of the face mask.

9. The method of claim 1 additionally including the step of heating the peripheral edge of the at least one layer of openwork flexible plastic material to seal the peripheral edge of the face mask.

10. The method of claim 1 additionally including the step of precutting the layer of filter material to a particular configuration and the at least one layer of openwork flexible plastic molded to extend past the periphery of the filter material.

11. The method of claim 10 additionally including the step of heating the peripheral edge of the at least one layer of openwork flexible plastic material at a position past the periphery of the filter material to form a bead.

12. The method of claim 1 additionally including the step of attaching a gasket around the peripheral edge of the face mask.