Views: 0 Author: Lucy -MINGHUNG MACHINE Publish Time: 19-04-2025 Origin: Lucy -MINGHUNG MACHINE
Keywords: #wheatstrawparticleboard #particleboardproduction #chipboardmakingmachine
Do you know how to make Wheat straw to be Particle board /Chipboard?
This article will tell you the production step
 | Pretreatment of raw material |
1. Collection and sorting of wheat straw
After harvesting, remove impurities such as soil and weeds, and keep the moisture content below 15% (to prevent mold).
Cut into segments of 30 to 50mm (for subsequent crushing).
2. Crushing and screening
The straw shavings are processed into 5 to 20mm in length and 1 to 3mm in width through hammer crushers or straw-specific shredders.
Vibrating screen classification: The surface layer uses fine material (<5mm), and the core layer uses coarse material (5-20mm).
| Drying |
The temperature of the drum dryer is 80 to 120℃ (wheat straw has poor heat resistance and requires low-temperature drying), and the moisture content is reduced to 3% to 6%.
Note: Straw is flammable, so the temperature must be strictly controlled and a spark detection system should be equipped.
| Adhesive applying |
1. Adhesive selection
MDI (Isocyanate) : Preferred, with good water resistance, suitable for the high-silicon waxy surface of straw (8% - 12% glue content).
Modified urea-formaldehyde resin: Ammonium chloride curing agent (10% to 15% of the glue volume) needs to be added, but the formaldehyde release is relatively high.
2. Gluing method
The roller glue mixer or air flow atomization spray glue ensures that the glue liquid evenly covers the surface of the straw.
| Forming and Pressing |
1. Paving
Layer-by-layer paving: Surface fine material + core coarse material, paving density 0.4-0.6g/cm³ (loose state).
Optional mechanical or air flow spreading machines are available (the straw shavings are relatively light, and the air flow speed needs to be adjusted to prevent them from flying).
2. Hot pressing parameters
Temperature: 160-180℃ (lower than that of wood particleboard to prevent straw from charring).
Pressure: 2.5-3.5MPa, Time: 0.3-0.5min/mm for plate thickness (for example, 4-6 minutes for a 12mm plate)
| Post Treament -Edge Cutting & Sanding |
1. Cooling and trimming
After being pressed out of the plate, it is naturally cooled to below 50℃ and trimmed into standard sizes (such as 1220×2440mm).
2. Sanding
The surface should be sanded (180-240 mesh) to enhance smoothness. The feeding speed needs to be controlled (the hardness of straw board is relatively low).
| Technical difficulties and solutions |
| Problem | Reason | Solution |
| Bonding strength low | Waxy layer barrier adhesive on the surface of straw | Pretreatment: Soak in 1%NaOH solution to remove wax |
| The board is prone to brittleness and cracking | The fibers are short and have poor toughness | Add 5% to 10% wood fiber or PP fiber for reinforcement |
| It has a high water absorption and expansion rate | Straw has high hydrophilicity | Use MDI glue + paraffin waterproofing agent (1% - 2%) |
| Environmental protection and economic benefits |
Advantages:
The cost of wheat straw is low (about one-third that of wood), reducing the pollution caused by burning.
Environmental protection policy support is available (such as carbon emission reduction subsidies).
Challenge:
The equipment needs to be adapted to the characteristics of straw (such as dust-proof and explosion-proof).
Market acceptance needs to be cultivated (consumers' understanding of the performance of straw boards)
If you are interested to make particle board by wheat straw or by other materials, welcome contact us, we are China factory of Particle board /Chipboard making machine, OSB making machine and MDF making machine, we can offer you the necessary and good machines for help you start this business
Contacts:
Mark: +86 18769900191
Ali: +86 15805496117
Lucy: +86 18954906501
Email: osbmdfmachinery@gmail.com
