Drilled Roller
Widely applicable in optical film, plastic sheet calendering, lithium-ion battery electrode processing, and coating-related industries.
Drilled RollerPrecision Deep-Hole Drilling Channel Design
On advanced film, lithium battery material, and precision calendering production lines, a surface temperature difference of ±1°C is enough to create visible deviations in yield rate. The solution doesn't lie in more precise temperature control equipment—it lies in the roller structure itself.
Deep-Hole Drilling Channels: Temperature Uniformity Starts with Structure
Traditional hollow rollers guide the heat transfer medium through a single central channel, with heat diffusing outward from the center. However, in high-speed continuous production, temperature dead zones almost inevitably form between the ends and the middle section. For optical films sensitive to refractive index changes, this means uneven shrinkage; for calendering processes, this means film thickness consistency becomes difficult to control.
The drilled roller approach is fundamentally different. We use deep-hole drilling techniques to precisely arrange multiple heat transfer channels in the outer ring area of the roller, uniformly surrounding the entire roller cross-section. Heat no longer diffuses from a single point but is conducted to the roller surface simultaneously from multiple positions, making temperature distribution inherently uniform from the ground up.
Traditional Hollow Roller
Single central heat transfer channel with heat diffusing from the center. Temperature dead zones exist between ends and middle section, significantly affecting processes sensitive to thermal shrinkage.
Precision Deep-Hole Drilling
Multiple channels uniformly surround the roller cross-section, minimizing thermal deformation with significantly improved roller surface temperature consistency.
Solid Thick-Wall Structure: Resisting Elastic Deformation Under High Pressure
Beyond temperature control, high-pressure calendering processes present another hidden risk: under continuous lateral forces, if the roller structure lacks sufficient rigidity, the middle section may experience minor elastic deflection, which directly manifests as lateral film thickness unevenness.
Shengchiaoya's drilled rollers employ a solid or thick-wall structure combined with deep-hole drilling design. The bending rigidity of a solid structure far exceeds that of traditional welded tube construction. Traditional welded tubes inherently have geometric stability limitations under high-pressure environments due to the presence of weld seams.
Precision Specifications
The combination of deep-hole drilling channels and solid thick-wall structure allows us to achieve the following precision specifications:
- Concentricity ≤ 0.01 mm
- Surface Roughness Ra ≤ 0.01 μm (optical mirror grade)
Our basis for final inspection and shipment is actual measurement data. Each roller is accompanied by a measurement report before leaving the factory.
Applicable Processes
Drilled rollers are currently primarily applied in the following processes with strict requirements for temperature control and geometric precision:
- A-PET Optical Light Guide Plate Production
- Advanced Optical Film and Functional Film Calendering
- Lithium Battery Electrode Sheet Calendering (with stringent roller surface temperature uniformity requirements)
- Other precision coating processes requiring lateral film thickness consistency
Heat transfer medium flows close to the roller surface, completely eliminating local hot spots and temperature dead zones found in traditional hollow rollers, ensuring uniform and consistent roller surface temperature control.
Effectively suppresses roller bending, ovality, and TIR runout during prolonged operation, maintaining micrometer-level production precision.
Solid or thick-wall structure combined with deep-hole drilling design resists elastic deformation in high-pressure calendering environments, maintaining stable lateral film thickness consistency.