Industry News

For most film production equipment, industrial cooling rollers are not installed at the end of the line; instead, they occupy a vital position at the very beginning of the process flow. A typical cast film production process includes: raw material conveying → extrusion and plasticization → melt filtration → T-die → industrial cooling roller → haul-off system → corona treatment → slitting and winding.

If you need very high temperature control precision (within ±1°C) Choose: Oil-heated roller. If you want to reduce long-term maintenance costs Choose: Oil-heated roller. If your equipment is for low-temperature, high-volume drying Choose: Water-heated roller.

Identifying early signs is crucial for determining if a heating roller is overheating. Immediate attention is required if any of the following signals appear: Rapid rise in roller body temperature exceeding the set value. This is the most direct signal of overheating.

Target hardness range for tungsten carbide coated rollers: •HV1100–HV1500 is considered the acceptable range •If hardness is too low (e.g., below HV900), it indicates insufficient coating density or abnormal spraying parameters •Excessive hardness accompanied by increased brittleness is also considered a failure

Once the thermal balance of an industrial mirror-finish roller is disrupted, the roller body undergoes: •Differential thermal expansion •Deformation of surface micro-topography •Uneven heat transfer •Variations in local cooling rates This directly compromises the product's flatness and transparency.

The typical coating thickness range for EPDM rubber rolls is 3mm to 25mm. While most industrial applications can find a suitable thickness within this range, this does not mean a single, uniform value applies to all rolls.

Different temperatures result in varying oxide film thicknesses: If a stainless steel heating roller operates continuously within a temperature range exceeding 450°C, the appearance of blackening is considered a normal oxidation phenomenon.

Fundamentally, a tungsten carbide industrial roller is a high-performance industrial roller that utilizes carbide materials (such as tungsten carbide) to form its functional working surface. Carbide industrial rollers typically consist of two components: 1. The roller body substrate 2. The carbide working layer

Mirror-grade finish: Ra 0.01–0.05 μm. Semi-mirror-grade finish: Ra 0.1–0.2 μm. When surface roughness exceeds these specified limits, the finished product may exhibit surface defects such as bright spots, ripples, or a hazy/matte appearance; polishing is then required to restore the surface to its original specifications.

In industrial environments, no single coating can "suit all operating conditions"; therefore, corona rollers must be available with a variety of coating options to ensure proper compatibility.

Strong acids are a major source of corrosion for rubber rollers, a problem frequently encountered in industries such as electroplating, papermaking, pharmaceuticals, and chemical manufacturing. Different types of rubber exhibit significant variations in their resistance to strong acids.

Engineering professionals within the industry generally agree that the true challenge in controlling a heating roller lies not in the question of "can it heat up?" but rather in "can the entire roller surface maintain uniform heating over an extended period?" The spiral channel design represents a critical structural solution specifically engineered to achieve this objective.