OSB Production Line, OSB Making Machine, OSB Equipment

Peeling machine with silo

For making OSB, usually choose the fast grow wood like Pine, Poplar, spruce, some factory will mix with hardwood to increase OSB strength.

By the Wood peeling machine to peel wood to be wood strands /flakes (Length 50-100mm, width 10-30mm, thickness 0.5-0.8mm). the peeled shavings and strands will be conveyed to the silo

Dryer

By rotary dryer or air dryer to drying the wood strands, drying temperature usually between 200~300℃. After drying, the shavings moisture will be 2%-4%, the moisture should not too high or too low, all not good for the quality

Resin applying system

<1> Common Adhesive types

        - PF (Phenolic resin): Strong water resistance for OSB/3, OSB/4 (outdoor grade)

        - MDI (methylene diphenyl diisocyanate): No formaldehyde, environmental protection, but the cost is higher

        - UF(Urea-formaldehyde): For OSB/1, OSB/2 (dry environment)

<2> Resin apply method: 

       - Glue spraying system: the shavings enter the mixer, and the glue is evenly sprayed through the high-pressure nozzle (the glue content is about 4%~8%).

                                                                              - Additives: Paraffin wax (water repellent) or curing agent may be added to improve performance

Slab forming

Directional paving

Surface shavings: arranged along the length direction of the plate (longitudinal) to improve bending strength.

Core layer shavings: horizontal or random arrangement, improve the internal bonding force.

Equipment: The use of mechanical laying machine or air flow laying machine, forming a 3~5 layer structure.

Pre-press

For pre-pressing the loose wood strands before Hot press, ensure the slab density uniform,structure stability and improve hot press efficiency.

 Preliminary compaction: Compact the loosen slab to be 50%-70% of required thickness (For example from 100mm to be 40-50mm)

 Venting and setting: remove air from slab

Hot press

Type of hot press: multi-layer hot press (8~24 layers) or continuous flat press (CP line).

Temperature: 180~220℃ (phenolic resin needs high temperature curing).

Pressure: 3~5MPa (high pressure to fully penetrate the glue).

Time: Adjust according to the thickness (such as about 3 to 5 minutes for an 18mm plate).

Target density: usually 600~700kg/m³ (high density OSB is more robust)

After hot pressing, the plate enters the cooling rack and cools to below 50 ° C to prevent deformation.

Cutting and Sanding

Cutting: Use a crosssaw to cut to a standard size (e.g. 1220×2440mm).

Sanding (optional) : Some OSB require surface sanding to improve flatness