| The wood impregnating and coating system in autoclave |
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Technical
notes IMP-PG plants |
| Introduction |
| Technical status |
| Treatments for trusses |
| Impregnation antique forniture |
| Examples and conclusions |
| Impregnators |
| DESCRIPTION OF A IMP-PG PLANT | |||||
The plant is made up of a very particularly thick autoclave (1) so as to support a maximum vacuum of 400 mmHg or 700 mmHg. The elements to be treated are loaded and positioned on a moving frame (18) equipped with a trolley, which moves into the autoclave on rails held internally at the top and bottom. At the bottom of the autoclave there is the deposit (2) containing
70 to 100 litres of impregnant or coating. A pump (4) pumps the
product to a series of atomiser outlets (7) placed in a star formation
on a frame (6) which moves horizontally forth and back along the
whole length of the autoclave.
A standard treatment cycle lasting about 20 to 30 minutes, is as follows: B – Treatment of items, with impregnant or finely atomised coating. During this phase the plant can operate both under constant vacuum or allowing air to enter to help the product penetrate deeply into the wood. C - A series of changes of air inside the autoclave to facilitate dripping, drying and pacifying of the treated items. This treatment guarantees: An absorption/ penetration of 3 to 6 mm. In the white part. - When using primer/finishing coats: A very high penetration and adherence level of the coating to the internal surface of the wood pores, a result that can only be achieved thanks to the vacuum. The exceptional penetration and adherence of the primer is the
only guarantee for a perfect and lasting resistance of the finishing
coat, both if applied using the same plant or using other techniques.
- Result guaranteed: Thanks to the completely automatic operation of the machine, any possible human error is excluded. - Maximum respect of the environment The vacuum pump, which sucks in the air in the autoclave, is the liquid ring type: it also uses water in a closed circuit. The impregnating and coating system operates in a perfectly
hermetically closed autoclave that prevents any type of
bad smell from exiting. Once the process has finished the product
may be fully recovered by sending it back to the relative deposit. The items exit the autoclave perfectly dry, treated or coated.
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