Industry News

Compared to materials such as natural rubber, EPDM, and silicone rubber, the most significant characteristic of NBR is that its molecular chain contains a large number of polar nitrile (–CN) groups. This structure is the fundamental reason for the exceptionally strong oil resistance of NBR rubber rollers.

Not all mirror rollers need chrome plating. ✔ Mirror rollers operate in high-speed, high-pressure, and corrosive environments. Chromium plating is mandatory. ✔ Mirror rollers are only used in low-speed, low-load, and general-requirement conditions. Chromium plating is not necessary.

—Yes. And it's not just that it "affects," but rather: In thin-walled rollers, the internal flow channel design is one of the key factors determining the quality of heat transfer performance, and in some cases, it is even more important than the wall thickness itself.

In PE casting, the casting film roller emphasizes stable cooling and adaptability; while in PP casting, it emphasizes temperature accuracy, cooling efficiency, and uniformity control. The differences stem from the inherent thermal properties and crystallization behavior of the materials.

Typical preheating time: 30–45 minutes This time range applies to the following conditions: • Common stainless steel heated roller diameters (200–400 mm) • Heating temperature 80°C–120°C • Heat transfer medium is thermal oil or high-temperature hot water • Appropriately matched heating system power

Standard industrial tungsten carbide coated rollers typically consist of 2-3 coating layers: 1. Bond Coat → Improves adhesion to the base metal 2. Interlayer (optional) → Enhances coating stability or buffers stress 3. Top Coat → Provides final hardness, abrasion resistance, and corrosion resistance

It's important to emphasize that repair is not always equivalent to a "completely new roller." The performance of a repaired EPDM rubber roller may indeed be limited when: • Structural damage to the metal core • Insufficient dimensional allowance due to repeated repairs • Original design parameters no longer suitable for current operating conditions

Yes, regular wall thickness checks are necessary for industrial thin-walled rollers. However, it's important to emphasize that this "necessity" does not stem from the certainty that thin-walled rollers will malfunction, but rather from the following engineering considerations.

• Thicker coatings can indeed improve lifespan and abrasion resistance. • However, excessively thick coatings may lead to decreased coating hardness or internal stress cracking. Therefore, thicker coatings are not always better; the optimal coating thickness is closely related to the application conditions.

The core purpose of preheating is to prevent drastic temperature shocks to the overall structure of the heated roller, thus allowing the roller to reach a balanced, stable, and controllable working state in the thermal environment.