80 years of glued laminated timber
80 years of glued laminated timber
(OP)
The structural glued laminated timber industry in North America is now 80 years old. The very first glued laminated timbers made in North America were in 1934 at Peshtigo, Wisconsin. Those arches are still standing and supporting the roof of the school library in Peshtigo.
RE: 80 years of glued laminated timber
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: 80 years of glued laminated timber
At that time Peshtigo was home to the world's largest woodenware factory, making all sorts of wooden products for everyday use: shingles, pails and all sorts of buckets, much more and of course, lumber.
It is fitting that the town that arose from the ashes of the 1871 fire was ultimately become the birthplace of the structural glued laminated timber industry in North America in 1934. The laminating plant in Peshtigo is still in operation.
RE: 80 years of glued laminated timber
B.E.
You are judged not by what you know, but by what you can do.
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: 80 years of glued laminated timber
And, over time, how long will the tens of millions of plywood house widely built after the war begin loosing roofs and walls as the plywood delaminates from itself?
RE: 80 years of glued laminated timber
I cannot answer the first part of the question, however I did get a practical answer to the second part of the question.
2 years ago I re- roofed my house which was built in 1962, over 85% of the plywood had to be replaced because it was de-laminating. It appeared to be a urea formaldehyde type glue ( clear) which was not holding up, other sheets that had resorcinol type glue appeared to be fine.
B.E.
You are judged not by what you know, but by what you can do.
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
Glued veneer plys should work well in mummy tombs. It is moisture that attacks mummies and plywood adhesives, right?
--
JHG
RE: 80 years of glued laminated timber
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: 80 years of glued laminated timber
The F4U Corsair had plywood elevators.
old field guy
RE: 80 years of glued laminated timber
Many aircraft of that era used wood of one kind or another in some more or less significant way but Mosquito stands out in terms of amount used and relative performance.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
RE: 80 years of glued laminated timber
Structural glued laminated timber is made of dimension lumber with grain orientation parallel. It can be straight or curved. It is utilized for structural arches and beams and trusses and ship ribs and highway noise barriers and utility towers and many other applications.
RE: 80 years of glued laminated timber
I'm not sure why the OP feels the topic is off course...we're all talking about laminated wood assemblies...some are more interesting than others perhaps. I always think these guys got it rolling in a big way:
Link
RE: 80 years of glued laminated timber
The aero types in the crowd may find it interesting to note that many techniques of structural analysis of "sandwich panels" were studied thoroughly by the Forest Products Labs. These days, the typical aircraft sandwich panel is faced with aluminum or fiberglass, and the core is usually a honeycomb of flame-retardant-soaked nylon (or more aluminum) but the original idea seemed to be plywood facings with corrugated paper core. You can always find the FPL in the references sections of books like Bruhn or ESDU, and in the airframe design manuals used by the OEM's, and, of course, the ANC-18 wood design manual that is still "acceptable data" to the FAA.
STF
RE: 80 years of glued laminated timber
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?