By Application
Stackers for Lumber and Plywood Treatment Plants
Treating plants need two things from a stacker: accurate stick placement before the treating cylinder so chemicals reach every surface, and tight solid-pack output after treatment for shipment. GBI builds for both stages — including a single stacker configurable for both functions on the same line.
The Two-Stage Stacking Job
Pre-Treatment and Post-Treatment Are Different Jobs
A treating plant handles lumber and plywood through a pressure or chemical treating process. Before the cylinder, stickers are placed between every course — and between plywood sheets — so treating solution can penetrate every face of the product. After the cylinder, stickers come out, and the product is re-stacked in solid packages for strapping and shipment.
These are two distinct stacking operations with different requirements. GBI engineers both, and in many treating plant configurations, a single GBI stacker handles both the pre-treatment and post-treatment stages.
Stage 1 — Before the Treating Cylinder
Automatic Stick-Placing
Stickers are placed between every course of lumber and between sheets of plywood so treating solution can reach every face during the pressure cycle. GBI's VPG Automatic Stick-Placing Stacker handles this at the high throughput rates treating plants require — similar to a softwood sawmill green end in cycle demands.
Automatic Stick-Placing Stacker →Stage 2 — After the Treating Cylinder
Solid-Pack Stacking
Treated product is re-stacked without stickers — tight solid packages of dimensional or random-length lumber, or plywood sheets, ready for strapping and outbound shipment. GBI solid-pack stackers handle both lumber and plywood product types.
Solid-Pack Stacker →Product Types
Lumber, Plywood, or Both
Dimensional and Random-Length Lumber
Most treating plants handle dimensional softwood lumber — 2×4 through 6×6 and larger timbers. Some also handle random-length boards. GBI stackers are configured to the specific lumber dimensions and package specs for your plant.
Pre-treatment: automatic stick placing between every course. Post-treatment: solid pack for the strapper.
Automatic Stick-Placing Stacker →Hybrid Lumber + Plywood
Many treating plants process both lumber and plywood. GBI's Hybrid Lumber and Plywood Stacker handles both product types on the same machine — eliminating the need for separate stacking lines for each product type.
Handles plywood sheet stacking with stickers for treatment, and re-stacking to solid packs after treatment, on the same stacker that handles your lumber line.
Hybrid Lumber and Plywood Stacker →Treatment Plant Workflow
Where GBI Equipment Fits
Incoming Lumber / Plywood
Dried, graded lumber and/or plywood arrives from sawmills or distributors. Material is sorted and staged for treating.
Pre-Treatment Stacking
GBI automatic stick-placing stacker builds treating packages with stickers between every course — ensuring chemical access to every face during the treating cycle.
Pressure Treating Cylinder
Treating packages enter the cylinder. Pressure treatment forces preservative or fire-retardant chemicals into every face of the product.
Post-Treatment Re-Stacking
Stickers are removed. GBI solid-pack stacker rebuilds tight packages for strapping, wrapping, and outbound shipment.
Supporting Equipment
Complete the Treatment Plant System
Stick Feed & Collection
Stickers used in the pre-treatment stage need to be loaded, distributed, and collected after the treating packages are broken down. GBI engineers the full stick handling loop.
Stick Feed & Collection →Infeed & Outfeed Transfer
Transfer systems connect incoming material to the pre-treatment stacker, and finished packages from the post-treatment stacker to your strapper and load-out.
Infeed & Outfeed Transfer →Breakdown Hoists
Tilt hoists break down incoming stickered packages from sawmill suppliers before they enter the treating line — desticking and presenting lumber to the re-treating stacker infeed.
Breakdown Hoists →Tell Us About Your Treating Plant
Product type (lumber, plywood, or both), throughput, treating cylinder configuration, and package specs — GBI engineers the right stacker system for your operation.
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