Face mask and method of its production

Abstract

The present disclosure relates to a face mask for removal of biological and mechanical impurities from breathed and/or exhaled air, comprising an inner textile layer and an outer textile layer, between which there is arranged a filtering layer of polymer nanofibres and/or active layer of polymer nanofibres, which in its structure contains a biocidal substance/s. The outer as well as the inner textile layer are formed of microfibres, while at least the outer textile layer and with it neighbouring filtering or active layer of polymer nanofibres are hydrophobic, and all layers are interconnected by a net of joints, that prevent their mutual motion and reduce permeability of the face mask only minimally. The inner textile layer is on periphery of the face mask provided with a layer of an adhesive for fastening to the face of the user. This method of fixing the face mask to the face secures perfect adhesion of the face mask to the skin along its entire periphery, thus preventing breathing of an unfiltered air. The present disclosure further relates to a method for production of such face mask.

1 . A face mask for removal of biological and mechanical impurities from breathed and/or exhaled air, comprising an inner textile layer and an outer textile layer, between which there is arranged a filtering layer of polymer nanofibres and/or active layer of polymer nanofibres, which in its structure contains a biocidal substance/s, wherein the outer as well as the inner textile layer are formed of microfibres, while at least the outer textile layer and with it neighbouring filtering or active layer of polymer nanofibres are hydrophobic, and all layers are mutually interconnected by a net of joints, that prevent their mutual motion and reduce permeability of the face mask only minimally, and the inner textile layer is on periphery of the face mask provided with a layer of an adhesive for fastening to the face of the user, whereas the face mask is at least in its middle section for covering the mouth and nose provided along its whole width with folds, which are fixed in places of shorter lateral sides. 
     
     
         2 . The face mask according to the  claim 1 , wherein the inner textile layer is formed of a non-woven fabric of spunbond or spunlace type, and the outer textile layer is formed of a non-woven textile of meltblown type. 
     
     
         3 . The face mask according to the  claim 1 , wherein the inner textile layer is formed of a non-woven fabric of spunbond or spunlace type and the outer textile layer comprises a sub-layer formed of a non-woven textile of meltblown type and a sub-layer formed of a non-woven fabric of spunbond type, while the sub-layer formed of non-woven fabric of meltblown type neighbours with filtering or active layer of nanofibres. 
     
     
         4 . The face mask according to  claim 1 , wherein the filtering layer of nanofibres contains nanofibres of polymer from the group of polyvinylidene fluoride (PVDF), polyurethane (PUR), polyester (PES), polylactic acid (PLA), polycaprolactone (PCL). 
     
     
         5 . The face mask according to  claim 1 , wherein the active layer of nanofibres contains nanofibres of polymer from the group of polyvinylidene fluoride (PVDF), polyurethane (PUR), polyester (PES), polylactic acid (PLA), polycaprolactone (PCL), which in their structure contain biocidal substance/s. 
     
     
         6 . The face mask according to the  claim 5 , wherein the nanofibres of the active layer contain nanoparticles of silver. 
     
     
         7 . The face mask according to  claim 1 , wherein all layers of the face mask are interconnected by a net of spot joints having density from 2 to 50 spot joints to cm 2  of the face mask surface. 
     
     
         8 . The face mask according to  claim 1 , wherein all layers of the face mask are interconnected by a net of abscissa joints. 
     
     
         9 . The face mask according to  claim 1 , wherein all layers of the face mask are interconnected by a net of mutually joined abscissa joints. 
     
     
         10 . The face mask according to  claim 7 , wherein the layers of the face mask are interconnected in the entire surface of the mask. 
     
     
         11 . The face mask according to  claim 7 , wherein the layers of the face mask are interconnected in the active section of surface of the mask. 
     
     
         12 . The face mask according to  claim 1 , wherein the upper longer side of the face mask is shaped into the protrusion extending in upward direction to cover the nose and to fit to its root, and the lower longer side of the face mask is shaped by the upward direction aiming recess to fit to the chin and neck of the user. 
     
     
         13 . A method for production of face masks, wherein they are cut out from fabric at least in two longitudinal stripes arranged side by side along the fabric, in which between an outer textile layer of the face mask and an inner textile layer of the face mask there is situated a filtering layer of polymer nanofibres and/or active layer of polymer nanofibres, which contain a biocidal substance/s, and which is even in direction of width as well as length of the fabric, and before the process of cutting out is started, the layers of the textile are mutually interconnected by a net of joints preventing mutual shifting of layers of the fabric, while the fabric is at beginning of production of the face mask arranged by the inner layer of the face mask upwards, and in the first step along an entire length of the fabric continuous folds for the middle section of the face masks of each longitudinal row of face masks are created, which are fixed along width of the fabric in places of shorter sides of the face masks, after then an adhesive is applied on, peripheral sections of future face masks, this adhesive is overlapped by antiadhesive material, and a row of side by side arranged face masks is cut out into final shape of the face masks. 
     
     
         14 . A method for production of face masks, wherein they are cut out from fabric in at least two longitudinal stripes arranged side by side along the fabric, in the said fabric between an outer textile layer of the face mask and an inner textile layer of the face mask there is situated a filtering layer of polymer nanofibres and/or active layer of polymer nanofibres, which contains a biocidal substance/s, and which is even in direction of width as well as length of the fabric, and before cutting out is started the layers of the fabric are mutually interconnected by a net of joints preventing mutual shifting of layers of the fabric, while at the beginning of production of the face mask the fabric is arranged by the inner layer of the face mask upwards, and in the first step along an entire length of the fabric continuous folds for middle section of the face masks of each longitudinal row of face masks are created, which are fixed along width of the fabric in places of shorter sides of the face masks, after then an adhesive is applied on the peripheral sections of the future face masks, subsequently a row of side by side arranged face masks is cut out into final shape of the face masks, and the layer of adhesive is overlapped by an antiadhesive material. 
     
     
         15 . Method according to  claim 13 , wherein the folds are fixed by ultrasound welding. 
     
     
         16 . Method according to  claim 13 , wherein the layers of the fabric are mutually interconnected by a net of spot joints. 
     
     
         17 . Method according to  claim 13 , wherein the layers of the fabric are mutually interconnected by a net of abscissa joints. 
     
     
         18 . Method according to  claim 13 , wherein the layers of the fabric are mutually interconnected by a net of mutually joined abscissa joints.