Solving Extruder Temperature Surge and Screw Wear Problems! BLOOM Alloy Screw and Barrel for More Stable Production

In extrusion production, uncontrolled temperature surge and rapid screw wear are two major pain points, especially for processing highly abrasive materials like calcium carbonate masterbatch. These issues not only directly affect product quality but also significantly increase equipment maintenance costs and downtime losses.

Many extruder users have encountered situations where the set temperature is 190℃, but the actual temperature suddenly spikes to 220℃ or drops sharply below 160℃. This drastic temperature fluctuation is called "temperature surge" (temperature shock/overshoot), a typical thermal imbalance problem in the extrusion process.

The heat sources in an extruder mainly consist of two parts: "external heat" provided by the barrel's external heating coil and "internal shear heat" generated by the screw rotating and extruding the material. The essence of overheating is the instantaneous imbalance between internal shear heat and the external heating/cooling system. Common causes include:

• Start-up/Shutdown Phases: A sudden increase in shear heat after material plasticization during cold startup, or the inability of residual heat to dissipate quickly after shutdown.
• Sudden Process Changes: Significant adjustments to screw speed and feed rate lead to sudden changes in shear heat, which the temperature control system cannot respond to in time.
• Material Characteristics: High-viscosity, high-hardness materials such as calcium carbonate masterbatch experience more intense shear heat generation during processing, making heat accumulation more likely.

For manufacturers producing high-wear materials, the combined harm of these two problems is particularly pronounced:

• Overheating can cause material degradation and carbonization, resulting in defects such as black spots and bubbles, severely impacting product yield.
• High-hardness materials accelerate screw and barrel wear. Combined with the thermal stress from overheating, this significantly shortens screw life, leading to frequent parts replacements and directly increasing production costs.
• Frequent equipment shutdowns for cleaning slag and screw replacement disrupt production continuity and severely impact efficiency.

The black spots on the screw surface mentioned by the customer are not a quality issue, but rather residual ash layer after nitriding treatment. Nitriding is a key process for improving screw hardness. BLOOM minimizes the amount of grinding after nitriding during production—less grinding results in higher surface hardness and stronger wear resistance. This ash layer has no impact on the production of common materials such as PE, PP, and calcium carbonate masterbatch; on the contrary, it maximizes the preservation of the screw's core wear-resistant layer.

More importantly, BLOOM screws use a nickel alloy + high-proportion tungsten alloy formula, the material itself being far harder than traditional screws, making grinding extremely difficult (even causing "bouncing"). Therefore, only a fine surface treatment is performed, ensuring peak hardness while avoiding performance loss due to over-processing.

Customers' concerns about "the barrel not being wrapped with a copper ring" are essentially a passive cooling solution used in traditional equipment to address "overheating caused by wear." BLOOM, through material upgrades, cuts the problem at its source: Highly wear-resistant materials significantly reduce screw and barrel wear, preventing abnormal shear heat accumulation due to increased component clearances, thus reducing the probability of overheating from the outset;

If customers need to address occasional overheating under special operating conditions, we can flexibly install cooling devices according to actual production needs, comprehensively adapting to production scenarios.

Addressing the high wear requirements of materials such as calcium carbonate masterbatch, BLOOM's independently developed BLM series alloy materials are veritable "wear-resistant weapons": The screw uses a nickel-based + tungsten alloy composite formula, resulting in higher hardness and stronger wear resistance, extending service life by 3-5 times compared to traditional materials; The barrel is fitted with a top-grade BLM60 (Ni60) alloy bushing, combining wear resistance, corrosion resistance, and high-temperature resistance (stable operation at 600℃), perfectly matching the screw and further reducing wear and overheating risks; A full-process 3D design ensures precise matching of the screw and barrel clearance, reducing material retention and shear heat concentration, balancing production efficiency and process stability.

The core demand of companies producing high-wear materials is "sufficiently wear-resistant screws and barrels to avoid frequent replacements," which is precisely BLOOM's core advantage. Leveraging its independently developed high-performance alloy materials, precise 3D custom design, and deep understanding of the needs of high-wear industries, BLOOM's screws and barrels have successfully served numerous high-end manufacturing companies worldwide, including those producing calcium carbonate masterbatch and lithium battery materials.

We consistently adhere to the principle of "solving core pain points through material upgrades," providing customers not only with more durable parts but also, through technological optimization, helping them reduce extrusion temperature, minimize wear, and improve production efficiency at the source, truly achieving "one-time investment, long-term benefits."

If your company also faces issues such as extruder temperature fluctuations, rapid screw wear, and unstable product quality, regardless of the material being produced, BLOOM can provide customized solutions. From material selection to equipment adaptation, our technical team provides full support, making extrusion production more stable and efficient!