Stack Smarter.
Stack Faster.
Buhrs ST4 Stacker
The Buhrs ST4 is a high-speed, servo-driven compensating stacker, built for precision handling of wrapped and non-wrapped products, with zero-friction stacking and up to 55 stacks per minute.
Precision Stacking. No Friction. No Limits.
The Buhrs ST4 is engineered to meet the toughest stacking demands — even with high-speed packaging lines. Its patented zero-friction catch system eliminates product damage and allows uncompensated stacking at speeds of up to 55 bundles per minute. It’s fast, gentle, and smart.
Zero-Friction Retaining System
Prevents shifting or damage during stacking — even with delicate or glossy products.
Up to 55 Stacks per Minute
Maximum output without compromising stability or precision.
Expanded Product Size Range
Supports product widths up to 420 mm — including square formats.
Flexible Output Directions
Inline (forward/backward) or 90° (left/right) discharge configuration.
Compact & Accessible
Open design for fast jam removal, easy maintenance, and ergonomic use.
Buhrs ST4
Wrapping & Enveloping system
Product Highlights
Zero-Friction Catch
Patented system avoids product shifting or marking
High-Speed Stacking
Up to 55 uncompensated stacks/min, up to 26,000 pph (A5 bundles)
Product Format Flexibility
Handles 110–420 mm length; up to 80 mm thickness
Servo Outfeed Start
Prevents stock deformation with soft acceleration
Open, Accessible Design
Quick jam clearance and maintenance
Double-Sided Output Options
Inline or right/left angle ejection flexibility
Buhrs ST4
Gallery
Technical Specifications
Dimensions
Module length:
2,500 mm (short)
3,700 mm (long infeed)
Width:
1,000 mm
Height:
1,800 mm
Product input height:
Long infeed:
1020–1270 mm
Short infeed:
770–1270 mm
Product Sizes
Length (travel direction):
110–420 mm
Width:
155–420 mm
Max thickness:
80 mm*
Max stack height:
235 mm
Capacity
Max bundles per minute (uncompensated):
55
Output per hour (by bundle size):
4: 13,000 pph
6 (A4/smaller): 19,000 pph
8 (A4): 21,000 pph
8 (A5): 26,000 pph
(*Depending on product characteristics)
Options
Long infeed arm
(lower angle for better flow)
Vacuum infeed belt for variable items/gimmicks
Water dispenser at infeed for added stability
Infeed speed sync with upstream systems
Single-side access for easy belt maintenance
Low drop height for improved stack accuracy
Upgrade Your Finishing Line with Smarter Stacking
Need to streamline stacking at high speed without risking product damage? The Buhrs ST4 brings unmatched speed, precision, and flexibility to your end-of-line setup.