In the pulp molding production line, drying and hot pressing are two critical processes that determine the final quality, durability, and production efficiency of molded pulp products. Whether producing traditional egg trays or high-end packaging and tableware, addressing the challenges in these stages is essential for manufacturers aiming to achieve stable output and reduced costs.
1. Common Drying Problems
Uneven drying – parts of the product retain excessive moisture, leading to deformation or reduced strength.
High energy consumption – conventional drying tunnels rely on coal or gas, with low efficiency and high operating costs.
Large space requirements – tunnel drying occupies significant floor area, reducing factory utilization.
Climate dependency – in humid regions, drying time increases drastically, lowering overall efficiency.
Solutions:
Improved hot air circulation – forced circulation ensures uniform heat distribution and consistent drying.
Multi-energy heating options – natural gas, steam, electricity, or biomass boilers can be combined for cost flexibility.
Heated metal mold drying – integrates forming and partial drying in one step, reducing post-drying workload.
Smart temperature & humidity control – sensors monitor drying curves in real time, preventing over-drying or under-drying.
2. Common Hot Pressing Problems
Insufficient or unstable pressure – leads to poor density and weak product strength.
Inaccurate temperature control – results in burns, discoloration, or unclear patterns.
Low efficiency – traditional hot press molds heat and cool slowly, limiting mass production capacity.
Product deformation after pressing – moisture rebound causes warping or bending.
Solutions:
High-precision hydraulic systems – deliver stable and uniform pressure for maximum product strength.
Electric or oil-heated molds – provide fast heating and precise control within ±1℃, improving surface finish.
Upgraded mold materials – aluminum alloy or stainless steel ensures better heat transfer and durability.
Automatic demolding & cooling systems – shorten production cycles and ensure shape stability after pressing.
3. Integrated Optimization Strategies
Drying + hot pressing linkage – pre-drying reduces moisture before hot pressing, cutting overall energy use.
Automated control – PLC and touchscreen systems allow one-touch operation and full process monitoring.
Energy-saving upgrades – waste heat recovery systems reuse drying exhaust heat, reducing energy consumption by 20–30%.
Modular design – expandable units for drying and hot pressing adapt to different production scales.
4. Results and Benefits
Higher product strength and smoother surfaces, meeting demands for premium eco-friendly packaging.
Production efficiency increased by 30–50%, significantly boosting annual output value.
Lower energy consumption and operating costs, improving competitiveness.
Full automation reduces labor dependency and minimizes operational risks.
HGHY: A Leading Manufacturer of Pulp Molding Machines
HGHY is a renowned name in the field of pulp molding machinery. With a reputation for innovation and quality, HGHY offers a range of machines suitable for various applications, including egg box production. Their machines are characterized by:
– Advanced Technology: HGHY machines incorporate cutting-edge technology, ensuring efficiency and precision in production.
– Customization Options: HGHY provides tailored solutions to meet specific production requirements, from small-scale operations to large-scale industrial setups.
– Environmentally Friendly: HGHY’s machines are designed with sustainability in mind, utilizing recycled materials and minimizing waste.
The Molded Pulp Insert Machine is more than equipment—it’s a gateway to joining the supply chain of the world’s leading smartphone brands. With a production capacity of 650–800 kg per day, rapid ROI, and compliance with global eco-packaging regulations, it positions manufacturers at the forefront of a booming, future-proof industry.
As Apple, Samsung, and other high-end electronics brands continue to expand sustainable practices, the companies that invest in molded pulp packaging today will secure not only business growth but also a role in shaping the green industrial ecosystem of tomorrow.
