PP Hollow Sheet Production Line: Efficient Extrusion Solution for Plastic Corrugated & Honeycomb Boards
What Is PP Hollow Sheet?
PP hollow sheet (Polypropylene Hollow Sheet), also known as plastic corrugated board, PP honeycomb panel, or hollow grid board, is a lightweight extruded panel consisting of two flat surfaces with vertical ribs in between. This unique double-wall structure delivers excellent rigidity and impact resistance while keeping weight extremely low. It is widely used in packaging, advertising, construction, and logistics.
Unlike standard hollow sheet, the production line introduced here uses a specially designed mold to produce hollow grid boards with a more regular internal structure and smoother surface — meeting the demands of high-end applications.
Key Advantages of PP Hollow Sheet
Lightweight & High Strength
The honeycomb or corrugated internal structure provides high rigidity at low density, offering excellent impact resistance and protecting products during transportation
Waterproof & Moisture-Resistant
Unlike paperboard, PP hollow sheet does not absorb water. It maintains stable performance even in humid environments without deformation or strength loss.
Chemical Resistance
Highly resistant to oils, salt water, and common chemicals, making it suitable for various industrial environments.
100% Recyclable
The material is fully recyclable, aligning with global sustainability trends and increasingly strict environmental regulations.
Easy to Process
It can be easily cut, printed, folded, and welded. After corona treatment, the surface offers excellent printability.
PP Hollow Sheet Production Line: Process Flow
A complete PP hollow sheet extrusion line includes the following key stages:
1. Extrusion System
Single-screw or twin-screw extruder ensures full plasticization of PP material. Co-extrusion systems are available for multi-layer structures, such as virgin skin layers with recycled core layers, effectively reducing production costs.
2. T-Die
A specially designed T-die controls melt distribution, ensuring uniform thickness and stable hollow structure. The die can be customized for different sheet widths and structures.
3. Vacuum Calibration System
After leaving the die, the molten PP sheet enters the vacuum calibration table, where vacuum forming and circulating water cooling precisely control sheet thickness and surface quality.
4. Heating & Stress Relief
The calibrated sheet passes through a heating oven to release internal stress, preventing deformation and improving flatness and long-term stability.
5. Corona Treatment
PP material has low surface energy, making printing and coating difficult. The corona treatment unit modifies the PP surface through electrical discharge, significantly improving ink adhesion and print quality.
6. Cooling & Cutting
After surface treatment, the sheet enters the cooling section and cutting system. The line can be equipped with automatic cutters, length control systems, and stacking systems for fully automated production.
PP Hollow Sheet Production Line: Technical Specifications
| Item | Specification |
| Raw Material | PP / Recycled PP |
| Sheet Width | 1000–3000mm |
| Sheet Thickness | 2–12mm |
| Capacity | 300–600kg/h |
| Extrusion Type | Single Screw |
| Structure Type | Double-Wall / Multi-Wall |
| Automation | PLC Intelligent Control |
| Surface Treatment | Corona Treatment (Optional) |
Specifications can be customized according to customer requirements.
Applications of PP Hollow Sheet
Packaging Industry
PP hollow sheet is widely used for reusable packaging boxes, layer pads, container liners, and automotive logistics packaging. Compared with paperboard packaging, it offers better moisture resistance and a longer service life.
Construction Industry
Used for floor protection boards, concrete protection panels, and temporary wall protection. The lightweight structure makes installation easier while maintaining excellent impact resistance.
Advertising Industry
After corona treatment, PP hollow sheet offers excellent printability, making it ideal for display boards, signage, and promotional materials.
Automotive & Industrial Applications
Used for interior protection parts, transport dividers, and industrial trays. Its chemical resistance and recyclability meet modern sustainable manufacturing requirements.
Special Applications
By adding functional masterbatches, properties such as anti-static, flame retardant, and UV resistance can be achieved, meeting the needs of electronics packaging, outdoor advertising, and other specialized applications.
Why Choose Our PP Hollow Sheet Production Line?
High-Efficiency Production
Optimized screw geometry and stable continuous operation design significantly improve production efficiency.
Precise Quality Control
Integrated PLC automatic control, intelligent temperature management, and precise thickness adjustment ensure uniform sheet thickness, smooth surface, and stable mechanical properties.
Flexible Manufacturing
Supports double-wall, multi-wall, and functional hollow sheet production to meet different application requirements. Sheet width, thickness, and structure can be customized.
Special Mold Technology
A specially designed mold — different from standard hollow sheet molds — ensures stable forming of special-structure sheets, with uniform inner and outer wall thickness and neatly arranged ribs.
Frequently Asked Questions
What is the difference between PP hollow sheet and standard hollow sheet?
PP hollow sheet uses a specially designed mold, resulting in a more regular internal structure and higher surface flatness. It is suitable for packaging and advertising applications with higher quality requirements.
What sheet specifications can the PP hollow sheet production line produce?
The standard line can produce sheets with a width of 1000–3000mm and a thickness of 2–12mm, with a capacity of 300–600kg/h. Specific specifications can be customized.
Can PP hollow sheet be recycled?
Yes. PP hollow sheet is 100% recyclable. The production line supports adding recycled material, achieving both environmental protection and cost control.
How many workers are needed to operate the line?
Equipped with a PLC intelligent control system, the modern production line can achieve a high level of automation, greatly reducing manual intervention.
Get More Information
If you are interested in our PP hollow sheet production line, please contact us for a detailed technical proposal and quotation.
We provide:
Free technical consultation and solution design
Customized equipment configuration
Installation, commissioning, and operator training
Comprehensive after-sales service
📩 Contact us today for your exclusive quotation!
