DOUBLE BACKER DF-12
CORRUGATOR DOUBLE BACKER DF-12
A high-speed double backer built for uniform hot plate heating, automatic canvas deviation correction, and stable bonding single and double wall corrugated board.
12–22 pcs
Heating Plates
150mm
Heating Plate Height
5–6 pcs
Weight Rollers / Plate
Hydraulic
Weight roller lift/lower
UNIFORM HEATING, STABLE BOARD BONDING
The DF-12 double backer sits at the wet end of the corrugated line, bonding the second liner onto the pre-glued single-face web under controlled heat and pressure before the board moves on to slitting, scoring, and cut-off. It’s built for plants running single or double wall board where consistent bonding and belt tracking matter as much as raw line speed.
Heating plates are 150mm in height and configured from 12 up to 22 pieces depending on line length, with ground-polished, chrome-plated surfaces for even heat release. Five to six weight rollers sit above each heating plate, with lift and lower motion controlled hydraulically and contact pressure fine-tuned pneumatically — giving operators independent control over heat transfer and mechanical pressure rather than a single fixed setting.
Canvas belt tracking is corrected automatically: the upper canvas uses a right-left eccentric adjust device, and the lower canvas has its own tension control unit with the same eccentric correction, so belt drift is caught and corrected without manual intervention during long production runs.
WHAT COMES ON EVERY DF-12
Core heating and belt-tracking hardware included as standard, before line-specific options are added.
| Heating plate height | 150 mm |
| Heating plate quantity | 12 – 22 pcs |
| Heating plate surface finish | Ground, plated chrome |
| Weight rollers per plate | 5 – 6 pcs |
| Weight roller lift / lower | Hydraulic control |
| Weight roller pressure | Pneumatic, adjustable |
| Upper canvas tension control | Right-left eccentric adjust device |
| Lower canvas belt control | 1 set tension control + eccentric adjust device |
| Optional entrance equipment | Pre-heating roll, motorized guide roll |
HEATING & COOLING SECTION BREAKDOWN
Full structural and mechanical breakdown of the DF-12’s two working zones — the heating section that bonds the board, and the cooling section that stabilizes it before the dry end.
A. HEATING SECTION
| Hot plate type | Thin-type hot plate, steel |
| Hot plate dimensions | 120 mm (H) × 600 mm (W) × 2650 mm (L) |
| Hot plate quantity | 20 pcs |
| Hot plate surface finish | Ground polished, chromed |
| Press shoe / air press adjustment | Hydraulic device, 1 unit |
| Steam pressure control | 3 sections |
| Upper canvas belt adjustor | Right / left, 1 set |
| Main frame material | 15″ channel steel |
B. COOLING SECTION
| Upper weight rollers | Ø70 mm, steel — 23 pcs |
| Lower guide rollers | Ø88 mm, steel — 23 pcs |
| Upper canvas belt tension adjustor | 2 sets |
| Lower canvas belt tension controller | 1 set |
| Main frame material | 12″ channel steel |
WHERE THE DF-12 FITS ON YOUR LINE
Briefly and concisely explainAs a wet-end component, the DF-12 is installed downstream of the single facer and glue unit on new corrugated board lines, or specified as an upgrade when rebuilding an existing double backer station.
what you do for your audience.
New corrugated line builds
Double backer retrofits
Packaging board plants
Heavy-duty / triple-wall lines
