The automatic hardboard production line is a complex system involving multiple processes (pulping, forming, pressing, drying, slitting, etc.), and its stable operation requires strict adherence to operating standards.

1、 Preparation work before production

Equipment inspection: Confirm that there are no residues or mechanical blockages in each section (such as pulping machine, molding machine, hot press plate, drying channel). Check if the pressure of the hydraulic/pneumatic system is normal (if the pressure of the hot press needs to be stable at 5-10MPa), and if there are no leaks in the pipeline. Lubricate transmission components (bearings, chains, guide rails) to ensure no dry wear.

Material and parameter matching: Check that the weight and width of the raw paper are consistent with the equipment settings to avoid material blockage or breakage caused by material mismatch. Preheat the drying oven to the set temperature (usually 120-180 ℃) to prevent warping of the cardboard caused by the start of the refrigeration unit.

Safety confirmation: The emergency stop button, protective cover, and photoelectric sensor are functioning properly, and warning signs are set up in high-temperature areas.

2、 Key controls in the production process

Process parameter monitoring

Adhesive coating amount: Adjust the adhesive amount according to the paper layer (such as 10-15g/m ² for corrugated paper), too much is prone to deformation, and too little is prone to adhesive failure.

Temperature control:

Segmented control of drying temperature (high inlet temperature → gradually decreasing outlet temperature) to prevent cardboard cracking or uneven moisture content.

The temperature deviation of the hot press plate should be ≤ ± 5 ℃ (it is recommended to use an infrared thermometer for spot checks).

Speed coordination:

Keep the industrial cardboard production line speed synchronized (such as pulp making → forming → pressing section speed difference ≤ 5%) to avoid uneven tension.

Real time quality inspection

Sampling inspection of cardboard every 30 minutes:

Flatness: No warping or blistering (can be visually inspected or used with platform lightboxes).

Edge compression strength (ECT): tested with an edge compression tester, and the standard value depends on the number of layers of cardboard (such as three layers ≥ 4kN/m).

Moisture content (8% -12%): If it is too high, it is easy to mold, and if it is too low, it is easy to crack (a rapid moisture analyzer can be used).

exception handling

Paper breakage/blockage: Immediately stop the machine for cleaning and check if the guide roller and tensioner are abnormal.

Uneven glue: Check if the gaps between the glue rollers are blocked or worn.

Abnormal temperature: Check heating elements (such as electric heating tubes, steam valves) and temperature control modules.

3、 Safety operation standards

Personnel protection

Operators are required to wear cut resistant gloves and noise cancelling earplugs, and wear a heat-insulating face mask when approaching high-temperature areas.

It is prohibited to directly clean the running rollers or cutting tools by hand, and specialized tools must be used.

Equipment safety: During maintenance or adjustment, the “LOTO” procedure must be followed to cut off the power/gas source. Perform maintenance after the hydraulic system is depressurized to avoid the risk of high-pressure oil spraying.

4、 Maintenance and upkeep

Routine maintenance

Clean the glue tank, scraper, and vacuum pipe after each shift to prevent the accumulation of glue residue/paper scraps.

Check the tightness of the drive belt (sag ≤ 10mm) and replace the cracked belt in a timely manner.

regular maintenance

Weekly: lubricate all bearings and gears, calibrate sensors (such as infrared thickness gauges).
Monthly: Check the cleanliness of hydraulic oil (NAS grade ≤ 8) and replace filters.

Quarterly: Disassemble and inspect the hot pressing plate, remove the surface carbonization glue stains, and polish it flat.

The stable operation of the Paper hardboard production line relies on standardized operation, meticulous maintenance, and real-time monitoring. It is recommended that enterprises establish standardized SOPs (Standard Operating Procedures) and combine them with intelligent equipment management systems (such as SCADA) to provide early warning of risks, which can significantly improve efficiency and extend equipment lifespan.

If you are also interested in this machine,please don’t hesitate to contact us:

Overseas manager: Tom Wang

Email:cartonmachine.tomwang@aliyun.com

Phone/Wechat/Whatsapp:+86 13303078975