How Plywood Is Made In Factories? (Mega Factories Video)

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Published 2021-05-28
Plywood production requires a good log, called a peeler, which is generally straighter and larger in diameter than one required for processing into dimensioned lumber by a sawmill. The log is laid horizontally and rotated about its long axis while a long blade is pressed into it, causing a thin layer of wood to peel off (much as a continuous sheet of paper from a roll). An adjustable nosebar, which may be solid or a roller, is pressed against the log during rotation, to create a "gap" for veneer to pass through between the knife and the nosebar. The nosebar partly compresses the wood as it is peeled; it controls vibration of the peeling knife; and assists in keeping the veneer being peeled to an accurate thickness. In this way the log is peeled into sheets of veneer, which are then cut to the desired oversize dimensions, to allow it to shrink (depending on wood species) when dried. The sheets are then patched, graded, glued together and then baked in a press at a temperature of at least 140 °C (284 °F), and at a pressure of up to 1.9 MPa (280 psi) (but more commonly 200 psi) to form the plywood panel. The panel can then be patched, have minor surface defects such as splits or small knot holes filled, re-sized, sanded or otherwise refinished, depending on the market for which it is intended.

Plywood for indoor use generally uses the less expensive urea-formaldehyde glue, which has limited water resistance, while outdoor and marine-grade plywood are designed to withstand moisture, and use a water-resistant phenol-formaldehyde glue to prevent delamination and to retain strength in high humidity.

Video Credit: www.westfraser.com

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All Comments (21)
  • @AeroCraftsman
    An old friend who worked at a plywood plant said nothing went to waste. The veneers made plywood, the chips made strand board, the sawdust made particle board and they even recorded the noise and sold it as rock and roll.
  • @lukelegg9915
    Im SO GLAD yall kept the raw sound, it love hearing the machines and such and not some cheesy annoying crf music
  • I always wondered how the logs were made into broad sheets/ boards. I was left thoughtless when I saw how it was sliced when it was held by a rotation component. The stability of the structures to perform the mechanism... Kudos to all the units involved in the process of making this indispensable component we use today! 3:22 Giant sharpeners? 😲
  • @alexbourdeau4438
    I was a hot press operator at a plywood mill back in the 1980s. Much more hand work then. The glue was applied by a four person crew, one person feeding 4' core pieces through the glue spreader, one person catching them and laying them out and two flipping backs, centers and faces onto the glued core pieces. Our mill did 24 panel loads. The stack of panels came to me via conveyor which fed into an hydraulic pre-press that compressed the sheets just enough so I could handle them. Then the panels went on a vertical ride with me to the top of the hot press. There I fed them one at a time between plattens. When the press was full and I was back on the ground, I'd close the press, wait 4-6 minutes and do it all over again. From the hot press the panels went on to the trim saws and sanders. Lots of hard, physical work, but very rewarding - you'd made something that would be used all over the world.
  • @flyinghawk9136
    I'm impressed by the engineers who have designed and made those processing machines. Respect!
  • The dude with the paint roller is one machine away from being eliminated.
  • @timsamuels7150
    I’ve been in the construction business 40 years, watching that process was very informative thank you.
  • @tonyhurd5697
    What I’m most impressed by , is the knowledge to create these machines , to coincide with each other to take a tree and make it into plywood . Amazing !!
  • @wamatar7596
    Definitely the Machine with the roller knife that turn the wood log into a sheet of ribbon is the most impressive and the cornerstone of that factory.
  • @troyano6548
    The designers of these machines are admirable people.
  • @Ephilates2024
    As a kid, I joined my father twice to visit St. Regis’s logging operation in WA and a smaller mill’s in Maine. He was the companies’ banker at First National City Bank, so he got the royal treatment (and his spoiled kid, too). I never looked at a piece of paper or lumber the same way again afterwards. It’s valuable to see the supply chain and all the people, skills and machines that go into it. We met a lot of people who were missing fingers!
  • @__seeker__
    I just want to take a moment to express my gratitude for the absence of annoying and pointless music and voiceover. Thank you.
  • @laverdadesmejor
    The process is interesting but what is more amazing is the initial design of the machinery that make the finished product!
  • @rumham1271
    “Ever wonder how plywood is made?” No, never. But go on.
  • @joeyrittierodt6958
    I was a core operator at Boise cascade in medford. OR. We layed slivers of 4' long pieces perpendicular to the 8x8 sheets and it was the most physical job I've ever had and hot. Even in the winter time it was over 100° up on that platform. The line never stopped! 8 straight hrs of GO! 2 ten min breakers and 1, 20 when you relief felt like relieving you. We worked as a team and you didn't want to piss anyone off because then you'd be the last to be relived.
  • @Finnimagoo
    I make the glue used in this plywood manufacturing process. Extremely expensive raw materials involved in the resin manufacturing side of it. Was really cool to see how it was applied and pressed.
  • @loui828
    It always amazes me that we humans have come up with this great machinery, like the type of engineering in this things are next level.
  • The logs being run through the lathe, is always my favorite part! Some of the processes I've seen in other countries roll the veneer back up, right after it is lathed... so it takes and unruly tree, that may be bowed, and crooked... and straitens it out! Cool stuff!
  • @rayjackson4547
    I knew generally how plywood was made, but after seeing the size of the factory and all the machinery I have a new respect for the material and the cost to manufacture.