Ragmask Max v1.4

This is a modified Ragmask for higher filtration using only fabrics available on the high street. The original Ragmask version 2.3 construction guide PDF here (great work Loren Brichter). This site's maintainer has been sharing "masks work" studies on social media since Feb 9th, and experimenting with satin filters for masks since the end of February and sharing designs since mid March (see main site).


Pics

Features

Ragmask Max uses a different template to the regular Ragmask and has a slightly different construction guide (see below).

Materials

Fabric Science - Cotton and Satin

Satin is tested for the first time in this April 18 2020 study: Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks (Abhiteja Konda, Abhinav Prakash, Gregory A. Moss, Michael Schmoldt, Gregory D. Grant, and Supratik Guha). The study rates chiffon higher, but you're going to do multiple layers of satin here to compensate. The study has a scientific breakdown of fabrics here Supporting information - Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks. I have worked with the figures by Konda et al to calculate filtration for different layer combinations: PLAYING WITH THE ARGONNE/CHICAGO FABRIC FILTRATION DATA. I have also been involved in a particle study that looked at 400 thread count cotton and the satin that I use for filtration: ZACH'S FABRIC TESTS APRIL/MAY. Use 600 thread count sheets is the simple conclusion - per Konda et al.

Cotton outer

Some cotton with a high thread count for the outer layer. I cut up a bedding set from the supermarket (400 thread count)Sainsbury's 400 Thread Count Fitted Sheet White . OR (better) some higher thread count cotton (750 thread count) Supima® Cotton 750 Thread Count Fitted Sheet

Satin liner

Some satin - again I used a bedding set (online purchase), but that may end up being thinner satin. If a fabric store is still open near you. This thinner satin is preferable. Duchess(e) satin is thicker (this is what wedding dresses are made of), but it is unsuitable for use in masks as it is too hard to breathe through even with the cupping design of this mask.

Plastic retainer for force 3D effect

Thin flexible plastic mesh sheet in order to snip up into a retainer (about 5 per sheet). I used inexpensive SNOBBIG placemats from the IKEA, but others could be found.

Nose wire

Plastic coated metal for the nose wire. I used "Soft twist plant ties" for the garden like this which were £1 for 10 yards for me until they ran out at my local poundland (dollar store)

Others

Lastly, you'll need a sewing machine with a zigzag stitch, polyester thread, and scissors

Fit

Ragmask Max: fit with two straps - you're making a short shopping trip, or have a solid nose to hold the mask in place for extended periods of time.

Ragmask Max: fit with four straps - you're working in this mask.


Frequently Asked Questions (FAQ)

Construction

One will take fifteen minutes to do the sewing on a machine, assuming you have ready to go straps. Here's a video of the the site maintainer making one:

Ragmask Max: being sewn.

If you make them in a batch, and don't keep cutting thread, then the time can drop to 7 minutes per mask

URL for that: https://cv-masks.github.io/vid

Step by step for three-layer satin filter

Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 1-9 Layer 1 Cotton Cotton Outer Layer 1 Cut rectangle 12” (31cm) x 5.5” (14cm) 600 thread count cotton is best Produced by OmniGraffle 7.15.1 2020-04-30 08:18:40 +0000 Canvas 1 Layer 1 Fold and sew 2 Produced by OmniGraffle 7.15.1 2020-04-30 08:24:03 +0000 Canvas 1 Layer 1 Fold again and iron 3 Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 1-9 Layer 1 Satin 4 Cut a rectangle Multi-Layer Satin Liner Three layers of satin : 12” (31cm) x 17” (43cm) Four layers of satin would be 22.5” (57cm) long with one more fold. Two layers of satin would be 11” (28.5cm) long with a single fold (for when you’re using cotton with less than 600 thread count) Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 1-9 Layer 1 Fold again and iron 4b Single-Layer Satin Liner (for when you’re using cotton with 600 thread count or higher) Satin One layers of satin would be 6” (12cm) long and 12” (31cm) wide Produced by OmniGraffle 7.17.3\n2020-08-26 08:59:10 +0000 1-9 Layer 1 Fold (multi-layer satin only) 5 Produced by OmniGraffle 7.17.3\n2020-08-26 08:59:10 +0000 1-9 Layer 1 Fold again and iron (multi-layer satin only) 6 Produced by OmniGraffle 7.15.1 2020-04-30 08:27:39 +0000 Canvas 1 Layer 1 Put the nose wire then the satin inside the cotton 7 (center the nose wire) Putting the layers together

See nose wire preparation: https://cv-masks.github.io/nw



Produced by OmniGraffle 7.15.2 2020-05-12 06:50:02 +0000 Canvas 1 Layer 1 Sew here all the way (12” / 31cm) cotton wire in center 8 8-big-message Nose wire should be 5” (12.5cm) long, plastic sleeved with wire snipped and shrunken into the plastic sleeve satin Produced by OmniGraffle 7.15.1 2020-04-30 08:30:14 +0000 Canvas 1 Layer 1 Fold in half here (bend nose wire to do so) 9 Produced by OmniGraffle 7.15.1 2020-04-30 08:34:27 +0000 Canvas 2 Layer 1 template Place template on fabric … 10 Produced by OmniGraffle 7.15.1 2020-04-30 08:34:27 +0000 Canvas 2 Layer 1 … and mark with a sharpie 11 Produced by OmniGraffle 7.15.1 2020-04-30 08:35:51 +0000 Canvas 2 Layer 1 Sew this line (ending at the nose on the right) 12 Produced by OmniGraffle 7.15.1 2020-04-30 08:36:35 +0000 Canvas 2 Layer 1 Cut the off excess with scissors 13 Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 10-19 Layer 1 Sew on 1” (2.5.cm) bias tape to tidy that edge 14 Produced by OmniGraffle 7.15.1 2020-04-30 08:37:42 +0000 Canvas 2 Layer 1 Carefully cut the side off … 15 Produced by OmniGraffle 7.15.1 2020-04-30 08:38:07 +0000 Canvas 2 Layer 1 … to look like this 16 Produced by OmniGraffle 7.15.1 2020-04-30 08:38:40 +0000 Canvas 2 Layer 1 zig-zag this bit two more times 17 Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 10-19 Layer 1 unfold then add 1” (2.5cm) bias tape to that edges 18 (this prevents edges fraying and touching your face) Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 10-19 Layer 1 Snip up SNOBBIG placemat to fit mask 19 Fitting the retainer to force cupping (so that the satin does not pull onto nostrils/lips) (back of mask) IKEA Snobbig placemat retainer - snip until it fits!!

Note - I am looking for help moving beyong IKEA placemats to 3D printed designs (downloaded from https://www.thingiverse.com/). See here

Produced by OmniGraffle 7.17.3\n2020-08-26 08:43:56 +0000 20-22 Layer 1 make sleeves for insertion and removal or placemat retainer 20 (back of mask) 1” bias tape sew in place on three sides zig-zag reinforce one edge right here and here

Produced by OmniGraffle 7.15.1 2020-04-30 13:50:37 +0000 Canvas 3 Layer 1 Sew on the two straps (on the outside of the mask) 21 Straps (front of mask)

See how to make straps: https://cv-masks.github.io/s

Produced by OmniGraffle 7.15.1 2020-04-30 08:43:49 +0000 Canvas 3 Layer 1 22 Hand wash in very hot soapy water and dry before use

Pertinent blog entries

About this site, and my quest for improved home made facemasks:

David Powell is International Air Transport Association's (IATA) medical adviser and he said "forget facemasks" on a published Skype interview on Feb 9th (or so). It took me 90 mins to find a 2008 study on "Professional and Home-Made Face Masks Reduce Exposure to Respiratory Infections among the General Population" and post that to Reddit. This microsite was first published on the 28th Feb, and I've continued to promote "Masks For All" and evolve mask designs since.