Jianhua Paper Products: An In-depth Look into Industrial Paper Tube Production Process!

Industrial paper tubes, as an essential auxiliary product in industries such as packaging, textiles, and printing, their production process directly determines the core properties of the product, such as hardness, compressive resistance, and flatness. With over a decade of production experience, Wu Yi Jian Hua Paper Products Factory has developed a mature and efficient industrial paper tube production system, ensuring that every tube meets the stringent demands of customers. Below, we delve into the complete production process of industrial paper tubes through six key stages:

Original Material Selection and Pretreatment

Raw materials are the foundation of paper tube quality; we strictly select them.High-tensile kraft paper, tube paperCustomizable eco-friendly and waterproof paper is available according to customer requirements, and triple inspections are conducted to ensure that the paper's weight, thickness, and tensile strength meet production standards.

During the pre-processing stage, the entire roll of paper must be cut to the designed dimensions. The automatic slitting machine ensures precise control of the paper width (accuracy within ±0.5mm), while also removing the frayed edges and wrinkles to prevent issues like bubbles and delamination during the subsequent rolling process.

Glue Formulation and Coating

The bonding strength of paper tubes relies on high-quality adhesive and precise coating technology. We utilizeEnvironmentally-friendly starch adhesive or synthetic resin adhesive(The adhesive viscosity can be adjusted according to the purpose of the paper tube), it is mixed in a temperature-controlled tank in specific proportions to ensure a balance between the adhesive's bonding and drying speed.

The coating process is carried out by an automatic glue applicator, where the paper is evenly coated with adhesive (coating amount adjustable between 8-12g/㎡) as it passes through the roller. Simultaneously, a pre-drying unit with hot air is used to initially dry the adhesive, preventing any overflow during rolling and ensuring the product's appearance remains unaffected.

Section III: Coiled Tube Shaping (Core Technology)

Coiling is a critical process that determines the inside diameter, roundness, and wall thickness of paper tubes. We employNumerical Control Spiral Pipe Bending MachineAchieve precise molding through the following steps:

1. Axle PositioningBased on the customer's specified inner diameter specifications, select the corresponding size of metal mandrel (inner diameter range covering 10mm-500mm) to ensure the concentricity between the mandrel and the tube bending machine.

2. Multi-layer RollingThe pre-processed paper is wrapped around the core shaft layer by layer, with the winding machine controlling the wrapping speed and tension via a servo motor to ensure each layer of paper is tightly bonded, avoiding any gaps.

3. Wall Thickness ControlAccording to the wall thickness specifications required by customers (customizable from 1mm to 20mm), the tube coiler automatically counts the winding layers and simultaneously adjusts the rolling pressure in real-time through a pressure sensor to ensure uniform wall thickness of the paper tube.

4. Preliminary solidificationAfter rolling, the paper tube is inserted into the curing oven with a mandrel, where the temperature is maintained between 50-60°C. It undergoes an initial drying process for 30-60 minutes to ensure the tube sets properly and prevents deformation during subsequent cutting.

Section IV: Cutting and Refining

The paper tubes are cut and precision finished to the customized lengths by the customer, with the specific process as follows:

1. Fixed-Length CuttingBy precisely locating the length of paper tubes with CNC tube cutting machines (accuracy within ±1mm), the cutting blades are made of high-speed steel, ensuring smooth and burr-free cuts.

2. End Face Precision RefinementThe cut paper tubes are then fed into an end face grinder, where both ends are polished to remove any cutting residue or burrs. This process ensures the parallelism of the tube ends (parallelism error ≤ 0.3mm), facilitating subsequent assembly or use by the customer.

3. Special TreatmentIf customers require waterproof and anti-slip properties, a coating treatment can be applied to the paper tube surface at this stage (such as applying a waterproof agent or anti-slip coating), further enhancing the performance of the paper tube.

V. Drying, Curing, and Shaping

Cut paper tubes must undergo deep drying to ensure complete curing of the adhesive, enhancing the tube's compressive strength. We employSegmental Drying RoomThe paper tubes are processed through three temperature zones (60°C preheating → 80°C drying → 50°C cooling) progressively, with the total drying time adjusted based on the wall thickness of the paper tube (typically 2-4 hours) to prevent cracking due to rapid drying.

After the drying process is complete, the paper tubes are moved to the shaping and inspection station, where they are sampled and tested for internal diameter, roundness, and compressive strength (the standard compressive strength of paper tubes should be ≥1500N/m) using a roundness gauge and a compression tester. Non-compliant products are immediately discarded to ensure that all outgoing products meet the standard.

Six: Product Inspection and Packaging

The final stage requires comprehensive quality control of the paper tubes and standardized packaging.

1. Comprehensive InspectionInspectors will individually examine the appearance of the paper tubes (free of scratches, bubbles, and delamination), dimensions (inner diameter, length, wall thickness), and performance (compressive strength, impact resistance), recording the test data to form a product quality report.

2. Custom PackagingTo meet our customers' transportation and storage needs, we offer packaging options such as boxes, pallets, or shrink wrap. Additionally, product specifications, batch numbers, and quantities are clearly labeled on the packaging for easy counting and usage by customers.

3. Warehouse ManagementFinished products will be stored in a climate-controlled warehouse (humidity maintained between 40%-60%) to prevent the paper tubes from weakening due to moisture, ensuring that the product is in better condition upon delivery to the customer.