Darryl Keil Last Activity 2025-09-09 11:09 AM
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Dean Graber

Posts: 11

Joined: 2003-11-25
Location: Wisonsin

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Subject : delamination
Posted : 2007-11-07 8:19 AM
Post #34171
Hi all, I've had my first failure in 10 yrs! Gently cuved doors on a cab. bent with 1/8" bending birch and covered both sides with cherry(back) and cherry framed birdseye (front) after only 6-8 months the seams are opening up? I did not back up the veneer with another layer (which I am going to do this time). I always use unibond,,,,(maybe not enough)? The finish was oil mix and wax. Oh, and it's only one door, but I have to remake both to look the same. Thanks for any help, Dean


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: delamination
Posted : 2007-11-08 7:59 AM
Post #34175 - In reply to #34171
Dean,

Are only the seams of the veneer opening up, not around the edges? Is it just the maple or both the maple and cherry? Any delamination of the 1/8" bending birch? The bending birch I've worked with was a two ply with one thick layer and one thin. Did the maple go on the thick or thin side?

Darryl


 
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Dean Graber

Posts: 11

Joined: 2003-11-25
Location: Wisonsin

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Subject : RE: delamination
Posted : 2007-11-08 12:09 PM
Post #34177 - In reply to #34175
both cherry and be are opening up. I'm not sure about thickness of bbirch, I'll have to check it out. I should cut one up and look closer. The bbirch is not delaminating just the face veneers. Just one door as far as I know. I'm going tomorrow to get the other door, so I can remake both, as the cherry is aged. Dean


 
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Brian Gray

Posts: 339

Joined: 2004-01-21
Location: Sandusky, OH

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Subject : RE: delamination
Posted : 2007-11-08 7:40 PM
Post #34180 - In reply to #34177
How old was your Unibond?

This could be the issue.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: delamination
Posted : 2007-11-12 5:17 PM
Post #34187 - In reply to #34177
Dean,

There are many possibilities as to why you are having bonding failure and sleuthing out the real cause can be difficult, especially when a considerable amount of time has passed.

I'll start with this. One of the most common Unibond glue failures is pressing to close to the minimum temperature requirement. Below a certain temperature you begin to get a poor bonding. The lower the temperature the more severe it gets. Of course not enough glue will obviously cause problems. Thats why I asked if both front and back side veneers were failing. Once side of bending birch is much more porous than the other.

Trying to sort out a glue problem is really better suited to an involved phone conversation. A forum is generally for simpler and more direct questions. I suggest you give me a call if you want to pursue this further.

Sincerely
Darryl Keil
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