Vacuum impregnation plant IMP-PG series

varnishing

Overview
Vacuum impregnation and varnishing units IMP-PG. The sealed autoclave system enables deep penetration and absorption of impregnating solutions and varnishes through controlled vacuum and atomization.

Installation layout
The system is built around a heavy-duty autoclave designed to withstand a maximum vacuum level of 400 mmHg or 700 mmHg. Workpieces are loaded on a mobile support with a trolley that runs into the autoclave on rails. A product reservoir (approx. 70–100 litres) is located at the autoclave base. A pump feeds the product to star-arranged atomizers mounted on a horizontally travelling carriage that covers the full autoclave length.

Operation — typical cycle

• Initial vacuum stage to evacuate air from wood pores.
• Treatment by finely atomized impregnating solution or varnish; operation can be maintained under vacuum or with controlled air admission to promote penetration.
• Series of air changes inside the autoclave to aid draining, drying and passivation of treated pieces.

Results and benefits

• Impregnating solutions: typical penetration of 3–6 mm into sapwood.
• Primers/topcoats: excellent penetration and adhesion to internal pore surfaces, improving finish durability.
• Fully automatic operation reduces human error.
• Sealed system prevents odor leaks; product can be recovered and returned to the reservoir.

Environmental and maintenance aspects
The vacuum pump is a liquid-ring type with a closed water circuit. The suction water is continuously recycled and must be periodically drained and renewed; it may contain residues from varnish products and requires proper handling.

Model overview

• IMP PG 1600 — A: 1000; B: 1100; C: 3000; D: 1600; E: 3700; F: 1800; H: 2000; Weight: 2000 kg; Installed power: 8.37 kW
• IMP PG 2300 — A: 1400; B: 1800; C: 3000; D: 2300; E: 3700; F: 2600; H: 2000; Weight: 3700 kg; Installed power: 8.37 kW
• IMP PG 2300/4500 — A: 1400; B: 1800; C: 4500; D: 2300; E: 5000; F: 2600; H: 2000; Weight: 4500 kg; Installed power: 8.37 kW
• IMP PG 2300/12000 — A: 1200; B: 1200; C: 12000; D: 2300; E: 12500; F: 2600; H: 2000; Weight: 9000 kg; Installed power: 12.87 kW

Construction notes
Autoclaves are custom-built to match the size of the pieces to be processed. Parts leave the autoclave properly drained and treated. The system enables product recovery and limits emissions by confinement.

Technical specifications

• Machine type: vacuum impregnation units (IMP-PG series).
• Maximum vacuum: 400 mmHg or 700 mmHg.
• Product reservoir capacity: approx. 70–100 litres.
• Atomization system: star-arranged atomizers on a mobile carriage.
• Standard cycle duration: approx. 20–30 minutes.
• Impregnation penetration: typically 3–6 mm (sapwood).
• Vacuum pump: liquid-ring type with closed water circuit (recycled water).
• Product recovery: possible at end of cycle, return to reservoir.
• Model options: several lengths/sizes (see model overview) with indicated installed powers.
• Construction: sealed autoclave, built to fit part dimensions.