Legendz Boatz
10-16-2020 | 05:30 AM
#5
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Joined: Oct 2000
Posts: 848
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From: Myrtle Beach SC
Nice looking boats. But I have a question? Since it seems like resin infusion is the new thing over the last15 years or so. But vacume bagging has been around a long time. It looks like the same process to me. What is the difference between vacume bagging, and resin infusion?
10-16-2020 | 07:18 AM
#6
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From: Jersey Shore
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vacuum bagging (traditional) - has all of the laminates inside the vacuum bag including the resin. When you apply a vacuum into this space, the resin is absorbed into the laminates. The question here is what if the resin is too little or too much? Even if an absorbing material is used to absorb the excess resin, not all of the excess may be absorbed by this material thus making a heavier part.
resin infusion - has all of the laminates inside the vacuum bag but does not have resin. Resin is introduced later after the vacuum is applied onto the laminates. Once the resin is introduced into the laminates, the laminates will absorb all of the resin it needs to with visual confirmation. The excess resin is pulled out of the vacuum bag matrix thus ensuring only the optimum amount of resin is used. The part is lighter because the excess resin is pulled out by the vacuum pump and the part is stronger because the laminates has the correct resin to laminate ratio.
excess resin makes the part heavier and weaker...pure resin that has been hardened with no fabric to reinforce it is brittle. this is also why we put rebar into the cement part, pure cement , when dried, is brittle and not strong
Other builders pre-wet the laminates with resin before vacuum bagging to ensure proper coverage and proper resin-to-laminate ratio
vacuum bagging (traditional) - has all of the laminates inside the vacuum bag including the resin. When you apply a vacuum into this space, the resin is absorbed into the laminates. The question here is what if the resin is too little or too much? Even if an absorbing material is used to absorb the excess resin, not all of the excess may be absorbed by this material thus making a heavier part.
resin infusion - has all of the laminates inside the vacuum bag but does not have resin. Resin is introduced later after the vacuum is applied onto the laminates. Once the resin is introduced into the laminates, the laminates will absorb all of the resin it needs to with visual confirmation. The excess resin is pulled out of the vacuum bag matrix thus ensuring only the optimum amount of resin is used. The part is lighter because the excess resin is pulled out by the vacuum pump and the part is stronger because the laminates has the correct resin to laminate ratio.
excess resin makes the part heavier and weaker...pure resin that has been hardened with no fabric to reinforce it is brittle. this is also why we put rebar into the cement part, pure cement , when dried, is brittle and not strong
Other builders pre-wet the laminates with resin before vacuum bagging to ensure proper coverage and proper resin-to-laminate ratio
10-16-2020 | 07:38 AM
#7
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Joined: Jan 2008
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From: Jersey Shore
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...additionally, have you ever stepped on wet carpeting ? When you step on wet carpeting, you displace the water for a moment (as seen in pic below). But when you've done this, is the carpet dry? It's not dry, the excess water has been removed. the carpet is still very much wet. This action is similar to vacuum bagging. With -1 bar applied by the vacuum film, the laminates has no chance of holding excess resin. But in normal atmospheric pressure the laminates will hold excess resin which is not the ideal resin-to-laminate ratio.
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...additionally, have you ever stepped on wet carpeting ? When you step on wet carpeting, you displace the water for a moment (as seen in pic below). But when you've done this, is the carpet dry? It's not dry, the excess water has been removed. the carpet is still very much wet. This action is similar to vacuum bagging. With -1 bar applied by the vacuum film, the laminates has no chance of holding excess resin. But in normal atmospheric pressure the laminates will hold excess resin which is not the ideal resin-to-laminate ratio.
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