Darryl Keil Last Activity 2026-01-12 8:29 AM
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John Troth

Posts: 16

Joined: 2010-02-07
Location: Coatesville, Pa

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Subject : temperature
Posted : 2010-02-07 3:16 PM
Post #35909
Can I use my vacupress when the room temperature is 64 degrees? If not, what does the room temperature have to be?
Thank You


 
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Darryl Keil

Posts: 1456

Joined: 2003-05-22
Location: Maine

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Subject : RE: temperature
Posted : 2010-02-07 4:32 PM
Post #35910 - In reply to #35909
John,

The VacuPress can operate at any temperature. Is it possible that you are getting the minimum usable temperature of the Unibond 800 glue, which is 65 degrees, mixed up with the operation of the VacuPress itself?

Darryl Keil


 
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John Troth

Posts: 16

Joined: 2010-02-07
Location: Coatesville, Pa

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Subject : RE: temperature
Posted : 2010-02-12 4:47 PM
Post #35919 - In reply to #35910
Darryl, Yes, I should have been more clear. I know the vacuum press will work at any shop temperature but what I meant to say is, at what termperature will the glue work with the press. Thank you for your help. I am going to have to invest in an electric blanket.


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: temperature
Posted : 2010-02-11 6:36 PM
Post #35913 - In reply to #35909
When I need to press and the room temp has not been at least 70 deg F for several hours, I spread an electric blanket over the bag and sandwich. If it's been as low as 65, I'll turn on the blanket and lay it over the platen first thing so the platen can be warming while I'm mixing the glue, et cetera.


 
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ckurak

Posts: 107

Joined: 2006-10-28
Location: Florida

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Subject : RE: temperature
Posted : 2010-02-11 7:56 PM
Post #35914 - In reply to #35913
I also use the electric blanket on cooler days. Adding a comforter on top of the electric blanket will help also. The comforter acts as an insulator to keep all of the extra heat from escaping above the blanket.


 
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John Troth

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Joined: 2010-02-07
Location: Coatesville, Pa

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Subject : RE: temperature
Posted : 2010-02-12 4:52 PM
Post #35920 - In reply to #35913
Don, thanks for your help. At 70 degrees with humidity around 65 percent approximately how long will it take to press walnut veneer on a board 72"X12"? In other words, being a novice, about how long should I allow before I open the bag to see if the job is finished. How do you tell if the bond is good and I can take the job out of the bag?
Thanks, John


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: temperature
Posted : 2010-02-12 7:11 PM
Post #35921 - In reply to #35920
Howard added a very good detail on heating blankets - a comforter, moving pad, or similar on top of the electric blanket helps hold the heat.
To tell when the glue is cured, I use a technique I learned from Darryl Keil. I always intend to have an extra several ounces of urea formaldehyde. After the veneer is in the bag and the vacuum drawn, but before clean up, pour the extra few ounces into a small zip lock snack bag, and lay it on top of the vacuum bag and under the blanket. (If you're cautious by nature, slip the bag in a larger zip lock for protection against leaks.) After 3 hours or so, check the snack bag every 340 minutes or so. When the glue in it is a firm rubbery consistency, the bag can be opened and the pressing removed.


 
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ckurak

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Joined: 2006-10-28
Location: Florida

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Subject : RE: temperature
Posted : 2010-02-12 8:33 PM
Post #35922 - In reply to #35921
Don,

Who is Howard?

Charles


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: temperature
Posted : 2010-02-14 4:49 PM
Post #35927 - In reply to #35922
Howard Ckurak? Oops, sorry for the mistake.


 
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Darryl Keil

Posts: 1456

Joined: 2003-05-22
Location: Maine

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Subject : RE: temperature
Posted : 2010-02-15 11:31 AM
Post #35928 - In reply to #35920
John,

A little amendment to Don's baggie recommendation which I do suggest performing. With the electric blanket there's a complication. With the baggie directly under the blanket it will receive the heat sooner than the the panel you are veneering. This will give you a premature reading in the baggie as to when the glue is cured enough at the panel, especially the back side. If you set a small piece of scrap plywood on top of the baggie, this will give you a reading more similar to whats happening at the real glue line.

If you want to skip all this baggie testing stuff and you're at about 70 degrees, figure 5 hours to play it safe. You're probably fine at 4 hours but without a test method I'd go for 5 hrs.

Darryl Keil
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