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Science Killed Itself Over COVID-19   The Serious You: How Current Events Affect You

Started 9/15/21 by WALTER784; 10080 views.

Shale is kind of closed cell porosity until you break it up to release the trapped material. That's how they are getting oil out of it in the Bakken and a few other places. Drill horizontally into the seam, then apply ungodly amounts of hydraulic pressure to frack it and inject sand to act as proppant and hold open the cracks once the fluid pressure is relieved.

Probably not enough porosity to pass a reasonable amount of air through at any reasonable sized filter area. You'd probably need to make a couple of entire walls out of the stuff to get enough area to force enough air through at reasonable pressure to adequately ventilate a shelter.

Like a filter 8 feet high and 16 feet wide, maybe a half inch to a quarter inch thick, and maybe 3 or 4 PSI differential to force the air through, which means a lot of mechanical support, like a bazillion smaller panes supported by, say, steel beams, so the pressure doesn't just make it implode.

now I've got to do some more research on shale porosity when it's quarried unaltered from the ground.

I know that it metamorphoses under heat and pressure into slate, which is quite non-porous. They used it for some castle roofs all over Europe for many thousands of years. And it is used as pool table sub-surfaces, beneath the felt, because it's heavy and flakes off nice and smooth.

WALTER784

From: WALTER784

Dec-6

The outer walls and roof of my home are made of slate. The slate walls are about 1.5" in thickness and work great to keep the heat out or heat in. 

In the summer months, the outer walls are hot but the inner walls are still cool. Likewise, when we heat the inner house, the heat doesn't dissipate to the outer surface of the slate.

FWIW

Showtalk
Host

From: Showtalk

Dec-6

I have a small water filter and it uses carbon. But it also leaves small particles in the water right after it’s changed out for a new one.

Showtalk
Host

From: Showtalk

Dec-6

How does Japan have such a big supply of slate?

WALTER784

From: WALTER784

Dec-6

In short response: Nozawa Corporation

The longer reply is:

Nozawa's history and founding story
 
Market capitalization 8.416 billion yen Stock code 5237
 
Nozawa Corporation is a company headquartered in Chuo-ku, Kobe. 1897 Kozaburo Nozawa, the first generation, established Kozaburo Nozawa Shoten in Kobe City and started importing Western indigo and other products. In 1906, we started importing slate boards, and in 1913 we aimed to domestically produce slate boards and established Nippon Asbestos Board Manufacturing Co., Ltd. 1926 Started manufacturing Rokko slate (thick slate), an improved version of Rocco tile. Currently, we are engaged in the manufacture, sale and construction of extruded cement products, slate, non-combustible admixtures, refractory coating materials, and asbestos removal work.
 
August 1897 Established Kozaburo Nozawa Shoten.
March 1906 Started importing foreign asbestos boards.
September 1913 Kozaburo Nozawa, the first president, established Nippon Asbestos Manufacturing Co., Ltd. in Kobe with the intention of domestically producing asbestos. At the same time, construction of a factory started in Motoyama Village, Hyogo Prefecture (currently Konancho, Higashinada Ward, Kobe City). Production started in August of the same year.
August 1937 Construction of Moji Slate Factory in Moji City (currently Moji Ward, Kitakyushu City).
September 1939 Merged with sister company Showa Cement Co., Ltd.
October 1944 Merged with sister company Nozawa Asbestos Mining Co., Ltd., and at the same time changed the trade name to Nozawa Asbestos Kogyo Co., Ltd.
August 1948 Started construction of Tokyo Slate Factory in Morigasaki, Tokyo, and started operation in November of the same year.
April 1949 Changed the trade name to Nozawa Asbestos Cement Co., Ltd.
May 1949 Listed on the First Section of the Osaka Securities Exchange.
May 1953 Construction of slate factory started in Kamata, Tokyo, and operation started in November of the same year. At the same time, the Tokyo Slate Factory was relocated and annexed, and is called the Tokyo Factory.
April 1961 Construction of a slate factory started in Tsurugashima Town, Saitama Prefecture, and operation started in January of the following year. At the same time, the Tokyo factory was relocated and merged and called the Tokyo factory.
June 1964 Started construction of Banshu Slate Factory in Harima Town, Hyogo Prefecture. Operation started in October of the following year.
January 1966 Transferred the cement division to Shiga Kosan Co., Ltd.
August 1966 Redesignated as the Second Section of the Osaka Securities Exchange.
March 1968 Started construction of Takasago Slate Factory in Iho-cho, Takasago City. Operation started in December of the same year.
March 1969 Closed Kobe factory due to new construction of Takasago factory.
October 1969 Established Nozawa Kosan Co., Ltd.
December 1969 Changed the trade name to Nozawa Corporation.
June 1970 Established Jack Aim Japan Co., Ltd. (Changed company name to Nozawa Shoji Co., Ltd.)
September 1970 Started manufacturing ASRock (extruded cement product) at the Tokyo Plant.
June 1977 Converted the Tokyo factory to a factory specializing in ASRock.
January 1985 Started construction of ASRock manufacturing plant at Banshu Plant, and started manufacturing in August of the same year.
August 1989 Started construction of Saitama Factory in Yoshimi Town, Saitama Prefecture. Completed in November 1990 and started operation. Tokyo factory closed.
March 1990 Started construction of a new technology research institute in Fukaya City, Saitama Prefecture. Completed in October 1990.
July 1991 Established SP Nozawa Co., Ltd. (currently Nozawa Trading Co., Ltd.). (Currently a consolidated subsidiary)
December 1994 Discontinued at Moji Factory.
April 1995 The Hokkaido factory was spun off and Furano Sangyo Co., Ltd. was established.
July 1999 Started manufacturing lightweight exterior wall materials (extruded cement products) for houses at the Saitama Factory.
January 2002 Dissolved Furano Sangyo Co., Ltd.
March 2005 Dissolved Nozawa Shoji Co., Ltd.
April 2005 Rokko Slate Co., Ltd. changed its trade name to Nozawa Corporation and became a consolidated subsidiary wholly owned by Nozawa Corporation.
October 2005 Dissolved Nozawa Kosan Co., Ltd.
April 2011 Established Nozawa Trading (Shanghai) Co., Ltd. in Shanghai, China. (Currently a consolidated subsidiary)
May 2011 Established Nozawa Sekisui House Advanced Building Materials (Shenyang) Co., Ltd. in Shenyang City, Liaoning Province, China based on a joint agreement with Sekisui House Co., Ltd. (currently a consolidated subsidiary). April 2012 Completion of manufacturing plant for extruded cement board and start of operation.
July 2013 Listed on the Second Section of the Tokyo Stock Exchange due to the integration of the Tokyo Stock Exchange and the Osaka Securities Exchange.
October 2016 Reverse stock split of 1 share for every 2 shares of common stock. Changed the number of shares constituting one
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  • Edited December 6, 2021 10:28 am  by  WALTER784
Showtalk
Host

From: Showtalk

Dec-6

A very long answer to a simple question, LOL. If I understand correctly, it’s imported?

WALTER784

From: WALTER784

Dec-6

Well, initially, the discussion was that shale was used to create slate. But Japan improvised and used imported asbestos with a mixture of locally produced concrete to produce a new type of slate which didn't require shale which is hard to come by in Japan.

FWIW

Showtalk
Host

From: Showtalk

Dec-6

Isn’t asbestos dangerous?

WALTER784

From: WALTER784

Dec-6

If it's used in a fibrous state (like they used to use for insulation) and it's allowed to decay (after 30 or 40 years), the fine particles that fray from it, if inhaled, can be carcinogenic. 

But they have come up with chemical compounds that, when mixed with concrete, can turn it into a solid hard slate (not fibrous) and which also has fire retardant properties as well. Suitable for outer walls and outer roofs of homes.

FWIW

So the slate is a fairly poor thermal conductor - or a reasonably good insulator.

If it wasn't so expensive, it might make a good material to work on hot materials over, if it doesn't spall from thermal shock if a little bit of molten metal were to splatter on it - like from cutting and welding above it.

But I know the stuff they use in pool tables is about 3/4 of an inch to about 1.25 inch thick and it's incredibly heavy. Back in college for a while I worked for an outfit that serviced pinball machines and pool tables. A pool table weighed at least 800 pounds. They were incredibly hazardous to handle on any kind of inclined surface for that reason - if one were in a proper dolly and it got away from you, it was as dangerous as a runaway car rolling down a hill.

We thus used power winches and lifting slings with all the care and safety protocols you would use operating a tow truck to load or unload a car.

The scariest job was when a pool table had to be brought up or down a flight of stairs, such as to a basement or 2nd story bar, as opposed to ground level. Most of the real work was preparing for the hoisting. We'd have to find something structurally solid enough to anchor the pulleys and line to at the top of the stairs. Then we'd lay 2x12 lumber on the stairs to make a ramp, with some cleats bolted to the underside to engage the stair treads.

Then we had to test the lifting line and pulleys and start the beast up the ramp. we tried to have a second safety line and a belay set up to a different part of the building structure. Sometimes we could open a window and put a steel beam outside that this was anchored to, so if something slipped the load couldn't just free-fall back down.

Only once it was solidly on a level floor could one really relax, then we'd just wheel it into position, and use the special pivoting part of the dolly to rotate the table from its side to upright since most stairwells are far too narrow to get a pool table up or down them while it's flat..

Last step was to use the dolly like a leveling jack. Retract all the leg adjustments, and slowly lower it with the scissors mechanism until the first leg touched the floor.

Lay a pair of levels on the surface at right angles to one another, and adjust the jack screws up or down to tilt the table until both bubbles were centered precisely.

Then finally you would extend the other leg screws until the weight transferred fully from dolly to floor, using a wrench to adjust the screw under load and keep the surface exactly level. Most floors were slightly uneven so you have to compensate.

Last step was, once you had a tiny bit of daylight between table and dolly, you go ahead and retract the scissors mechanism and slide the thing out from under the table, and roll the cage back to its side so you could get the dolly out of the bar or whatever.

It was doing a few of those installations that let me see the Smokeeters up close, including watching them be serviced to see how they worked.

And of course we had to clean up whatever we had rigged to get the table up / down the stairs.

Best scenario was a building with a big enough elevator to get table and dolly inside.

Usually, since ADA compliance was still a decade away or more, we had to usually go up or down a few steps even for a ground floor installation as that would never be at exactly the height of the sidewalk. Today, ,wheelchair ramps are perfect for moving very heavy objects. That saved the day about 4 years ago when I helped someone swap out some major components of a mainframe computer.

A hard drive about the size of a washing machine has 1/128th the capacity of the USB thumb drive in my pants watch fob pocket at the moment.

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