The relation between Resin Treatment of stone and impregnation under vacuum
The utility and importance of the impregnation under vacuum have been discussed extensively over the past two decades. There were times when most stone processors and machinery makers agreed on the desirability of vacuum impregnating the resin coated slabs to improve the penetration of the resin into faults. After that, increasing numbers of people began to wonder whether it is really worth carrying out vacuum impregnation or this operation is unnecessary. Not so long ago, someone has even reached the conclusion that vacuum machines are absolutely useless, and started to spread this theory worldwide.
Although we have a wealth of experience over the Resin Treatment and we have very clear ideas about what is right and what is wrong in stone processing, we never try to convince anyone of anything. We rather prefer to simply examine the possible advantages of vacuum impregnating a certain stone with the various types of resin commonly available on the market.
Anyone who has tried for themselves to restore defective slabs will have surely noticed how difficult it is for the resin to get into the narrow fissures. No matter how good the resin applied to the stone is, until the faults are filled the strengthening of the material is only an illusion. This is a trouble for stone workshops producing countertops, windowsills, stairs, fireplaces and vanities, because their slabs can break shortly after being loaded on the worktables of cutting machines. Sometimes problems arise when the made-to-measure stone elements are passed to the finishing machines. For example, one or more parts of an expensive and complicated stone work can chip or crack during edge polishing.
All in all, we can reasonably say that there are cases where using a vacuum chamber makes a big difference to the quality of the finished product. In principle, it is advisable to impregnate under vacuum all materials with hairline fractures which are so deep to even pass through the entire thickness of slabs.
The presence of micro fractures on the surface of polished slabs has a negative impact on the business of granite processors. Proper impregnation under vacuum makes it possible to fill and hide these imperfections.
The latest machines for vacuum impregnation of stone from S.E.I.
Since its launch in the mid ‘90s the “S.V.S.” Vacuum Chamber has proved to be an effective means to obtain better resin penetration into small cracks. Despite this machine is exceptionally versatile, it should be considered as an ideal system for granite surface enhancement.
The “S.V.S. R1” Vacuum Chamber is designed to force the resin to drip into the deep diagonal hairline cracks which weaken much marble, limestone and onyx.
The “T.V.T.” type is nothing but an “S.V.S.” Vacuum Chamber with dimensions smaller than normal. Indeed, the “T.V.T.” machine is aimed at completing plants for the treatment of strips.
S.E.I. has recently completed the design of its “SVR” chamber, the only vacuum and radiofrequency combined technology machine on the market today. The “SVR” is a multipurpose device which can be used to both accelerate the curing of resins for surface enhancement of compact stone and to force low viscosity resin to drip into hairline cracks of valuable materials.