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Pre-Treatment Drying Module Integrated in Material Hopper PP Band Extrusion Line

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Pre-Treatment Drying Module Integrated in Material Hopper PP Band Extrusion Line

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Brand Name :	CHUQI
Model Number :	CQ-SPP75-4
Payment Terms :	T/T
Supply Ability :	10SETS
Delivery Time :	60DAYS

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Pre-Treatment Drying Module Integrated in Material Hopper PP Band Extrusion Line

Pre-Treatment Drying Module Integrated in Material Hopper

Product Introduction

Raw material moisture is the invisible killer of high-quality extrusion production. This production line innovatively integrates a raw material pre-drying module directly within the PP raw material hopper. This module forms a sealed drying chamber at the bottom or inside the hopper, utilizing controlled hot air circulation to provide continuous, uniform pre-heating and dehumidification to the material before it is fed into the extruder. This "dry-on-demand" integrated design ensures that every single PP pellet fed into production has a moisture content of ≤0.1%, eliminating moisture-induced process fluctuations and product defects at the very source, laying a solid foundation for stable and efficient production.

Main Specifications

Design Philosophy: Drying function is integrated with the raw material storage/feeding hopper
Core Function: Provides continuous hot air circulation drying for material inside the hopper
Performance Target: Ensures raw material moisture content at the extruder feed throat is ≤ 0.1%
Structural Advantage: Saves space occupied by a standalone dryer, simplifies the process, reduces heat loss

Technical Parameters

Item	Parameter / Description
Integration Method	Built-in type, drying air duct designed integrally with the hopper
Drying Principle	Closed-loop hot air circulation, penetrating the material layer from top to bottom or from center to periphery
Drying Temperature Range	0 - 120°C Settable and Adjustable (typically set at 80-100°C)
Dehumidification Capability	Ensures material within the hopper reaches moisture content ≤ 0.1% during its residence time
Heating Power	Integrated within the total system power, high efficiency and energy saving
Control Method	Independent temperature controller for setting and displaying drying temperature

Customer Questions & Answers

What are the advantages of an integrated dryer compared to using a separate, standalone dryer?

The core advantages are shorter process flow, higher thermal efficiency, and space saving. A standalone dryer requires drying the material first and then conveying it to the hopper, during which it may re-absorb moisture from the air. The integrated design keeps the material in a drying environment until the very moment it is used, and the hot air circulates in a closed system with minimal heat loss, resulting in lower energy consumption. It also saves the installation space and cost of a standalone dryer.

Is a higher drying temperature always better for dehumidification?

Not necessarily. For PP, excessively high drying temperatures (e.g., consistently above 120°C) may cause raw material pre-plasticization or caking, which can block the feed throat or affect subsequent extrusion plasticization. The range of 80-100°C is generally safe and effective. The key is ensuring sufficient hot air flow and adequate residence time of the material in the drying zone, not just increasing temperature.

If the machine is shut down for an extended period (e.g., holiday), should the hopper be emptied of material?

It is strongly recommended to empty it. While the integrated drying module keeps the material dry during operation, static material inside a closed hopper during a prolonged shutdown will slowly absorb trace moisture from the sealed space. To ensure material quality immediately upon restarting production, it is advised to run the material in the hopper empty before a long shutdown or to remove and seal it for storage.

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