According to post 2049 and following the difference in compression force between 800mbar (clamp type machine) and 999mbar (chamber machine) would not make such a terrible difference. Has anyone confirmed NY_Amateur's experiences?
You can easily infuse fruits and vegetables with a clamp type machine using vacuum containers, not bags, see Instant rum pot and Infusing cucumbers, melons etc.
You can't compress vegetables with the ZipLoc device or a FoodSaver for that matter. I don't know of an affordable solution that makes it possible to compress vegetables.
If someone knows of one, please let us know. I am dying to try compressed watermelon about which I have heard amazing things.
With the weaker vacuum of clamp type machines compared to chamber machines, the fruits will not become as perfectly translucent as in Jean-François' experiments, but on releasing the vacuum, the surrounding liquid will be sucked into the fruits anyway giving them the desired flavor. When fruits are kept compressed in the bag for a prolonged period, they might lose their elasticity and on releasing the vacuum they might not aspirate as much liquid as on immediate release of the vacuum. Would one of you guys with a chamber machine (blackp? Douglas Baldwin? Jean-François?) do a comparison test?
Infusing is VERY different from compressing fruits significantly. I know several professional chefs that have had the compressed watermelon (for instance) from French Laundry. And they have tried and tried with clamp-type vacuum packers to get it to work and all have said that the tiny amount of compression that you get with a FoodSaver (and similar device) is just not enough to get the radical compression that people can get with good chamber-type sealers.
The texture changes quite radically with Keller's method. I have wondered if there is some kind of hand pump that can do it.
The syringe trick (if I am understanding it right wouldn't work for compression. Infusion works by sucking the air out of the spaces and having the liquid replace it when atmospheric pressure returns. So, it requires a rigid-walled container.
With the syringe trick you could apply positive pressure much higher than the difference between atmospheric pressure and vacuum. Did anyone try that?