HOME: COVID-19 DIY Face ShieldCONTACT US
Trimill Ind. Systems
We are Joining the Fight Against COVID-19
Last updated on April 13, 2020
Over the past week we made several YouTube videos on how to make your own DIY COVID-19 Face Shield. You can play the videos though the links provided below.
As of today (April 9, 2020), our videos have been viewed more than 200,000 times! Thanks to everyone who viewed and shared the videos, and to those who made face shields for themselves and others!
At the time I posted the first video, there were no other similar videos on YouTube. Since then many have DIY face shield videos have been posted, which is great!
April 9, 20209
We have been contacted by CFS Products Inc. (https://www.cfsbinds.com/) to let us know that they are now selling their clear binding covers at a steep discount to support this worldwide effort! You can now order their binding covers at https://www.cfsbinds.com/8-5-x-11-med-7-mil-square-corners-100-bundle.html (They also sell these covers on Amazon)
Also, check out their YouTube Video!
Here we will post some questions and answers from Branko's YouTube channel, in no particular order.
How do you take off the face shield after use? Let's say that you just went to the market and are about to get into the car. Do you wipe the visor down with alcohol first before taking it off?
This is what I do, not necessarily the best practice:
Unless you wear full PPE including the full body gown, the N-95 mask, the
face shield and the gloves, you may become exposed to Coronavirus whenever
you enter the environment in which Coronavirus is present in the air
(aerosolized) or on the surfaces. However, the face shield alone should help
reduce the Infectious Dose (the amount of virus exposure at the start of
infection), by providing a physical barrier to water droplets containing
Coronavirus and by making it much harder to touch your face while you are
wearing it. Reducing the Infectious Dose should at least make your symptoms
milder in case you become infected with the Coronavirus.
Can wearing a face mask of any kind reduce your chances of getting infected?
So far the authorities in the western countries have generally been advising against wearing masks when it comes to general public. Sometimes the risk of getting infected when removing the mask and the risk of touching your face when wearing the mask (to adjust the mask) were cited as rationales for this recommendation. Many suspected that the main reason was that there was, and is, a shortage of masks for the health care workers, who need the masks much more than general public.
Just within the last few days, the recommendations seem to have started change. Some of the reasons cited for this is the experience from countries like China, South Korea, Taiwan and Japan, which have successfully "flattened the curve" and where a lot more people wear masks than in the western countries. While correlation does not necessarily imply causations, there seems to be mounting evidence that wearing masks reduces the chances of infection.
There are several potential issues with wearing a face mask mask that have been quoted in the media:
If I can't find a medical face mask, what other options do I have?
The best answers to this question can be found on the CDC Web page Strategies for Optimizing the Supply of Facemasks. Below is an excerpt (HCP means Health Care Personnel):
Question on the Face Shield design: Would it work well if there is a big open space (gap) under the Face Shield?
The most important part of the face shield is the top part (say the top 6 inches or 15 cm), which covers the eyes, the nose and the mouth. However, the longer the shield and the more it wraps around your head, the better. If the transparent plastic is too small or to short, one way to extend the face shield is to glue or tape or staple another piece of plastic to the bottom of it or to the sides of it. The bottom or side pieces don't even have have to be transparent.
Why aren't health authorities advising general public to wear face shields?
This is a very good question. One answer would be ask the health authorities, only they should know. One possible reason is that, while it is somewhat normal for general public to wear face masks (especially in many Asian countries) it is not usual to wear face shields. Another reason could be that the there are still not enough face shields for the health care professionals, let alone general public.
This news article (thanks to one Julia for the link) talks about how wearing face shields in public could help fight the Pandemic Iowa doctors: Face shields are an achievable way to provide protections that COVID-19 demands. The Iowa doctors article says basically the same thing that we have been trying to promote. The only thing they have missed is that the general public could be equipped with DIY face shields in a very short order. Otherwise, it will take a very long time to wait for production to catch up to the demand.
Here's an interesting story from Thailand on face shields for babies!
What are the pros and cons of wearing the face shield versus a face mask?
According to the scientific paper Face shields for infection control: A review by Raymond J. Roberge, the Advantages and disadvantages of face shields compared with other forms of face/eye protection (i.e., protective facemasks [filtering facepiece respirators, medical/surgical masks], goggles, safety glasses) are:
Again and again, a couple of important advantages of the face shields are missed:
One problem we encountered was fog. Do you have some kind of solution for this?
One of our YouTube viewers (Mary Ann) came up with an elegant solution, by adding weather strip pieces spaced along the strip base to create air flow channel, as shown in the picture on the left below. This method will work well if you are using thin foam (weather stripping), say 1/4 to 3/8 inch thick (6 to 10 mm).
Another, even easier way would be to cut the foam into four 2 inch long pieces and space them 1/2 inches apart, as shown in the picture on the right. This assumes that you are using the foam that is 1/2 inch (13 mm) thick or more.
This way the warm breath air can pass out the top of the mask. This should work for both cold weather to avoid fogging up and for warm weather to provide some cooling air flow under the face shield.
Copyright © Trimill