Binder Application Modified Potato Starch Processing Machines for Corrugated Paper Case

Product Description

Product Description

 

modified starch prodction line modified starch machine modified starch extruder 
Using a **twin-screw extruder** to produce **modified starch** involves mechanical, thermal, and chemical modification of native starch. The process is efficient, continuous, and allows for precise control over reaction conditions. Below is a step-by-step guide:

 **1. Selection of Raw Materials** **Native Starch**: Corn, potato, tapioca, wheat, or rice starch.
- **Modification Agents** (depending on desired properties):
  - **Chemical modifiers**: Acids, alkalis, oxidants (e.g., hydrogen peroxide), cross-linkers (e.g., sodium trimetaphosphate), or esters (e.g., acetic anhydride).
  - **Enzymes**: For enzymatic modification (e.g., α-amylase).
  - **Plasticizers**: Glycerol, water (for thermoplastic starch).

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 **2. Pre-Treatment of Starch (Optional)**
- **Drying**: Reduce moisture content if too high (typically to ~10-20%).
- **Pre-mixing**: Blend starch with modifiers (e.g., acids, alkalis, or cross-linkers) before feeding into the extruder.

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**3. Twin-Screw Extrusion Process**
 **Extruder Setup**
- **Screw Configuration**: Use a combination of **kneading blocks, reverse elements, and conveying screws** to ensure proper mixing, shearing, and reaction.
- **Barrel Temperature Zones**:  
  - **Zone 1 (Feed)**: 25-50°C (pre-mixing & feeding).  
  - **Zone 2-3 (Melting/Kneading)**: 70-120°C (gelatinization).  
  - **Zone 4-5 (Reaction)**: 90-180°C (chemical modification).  
  - **Zone 6 (Cooling/Die)**: 50-100°C (stabilization).  
- **Screw Speed**: 100-500 RPM (adjust based on shear requirement).
- **Residence Time**: 1-5 minutes (depends on modification type).

 **Modification Mechanisms**
- **Thermo-Mechanical Gelatinization**: Starch granules are disrupted under heat and shear.
- **Chemical Reaction**: Modifiers react with starch (e.g., esterification, cross-linking, oxidation).
- **Enzymatic Hydrolysis** (if enzymes are used, keep temperature <60°C).

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**4. Post-Extrusion Processing**
- **Cooling & Drying**: Extruded starch may need drying to stabilize moisture.
- **Grinding**: Pelletized or flaked starch can be milled into powder.
- **Neutralization/Washing** (if needed): For chemical-modified starch (e.g., acid-thinned starch may require pH adjustment).

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**5. Types of Modified Starch Produced**
| **Modification Type** | **Agents Used** | **Extrusion Conditions** | **Properties Achieved** |
|-----------------------|----------------|--------------------------|-------------------------|
| **Pre-gelatinized**  | Water, heat | 80-120°C, high shear | Cold-water solubility |
| **Cross-linked** | STMP, POCl | 100-150°C, alkaline pH | Improved heat stability |
| **Oxidized** | HO, NaOCl | 70-100°C | Lower viscosity, clarity |
| **Acetylated** | Acetic anhydride | 100-140°C | Improved film-forming |
| **Thermoplastic (TPS)** | Glycerol/water | 120-180°C | Biodegradable plastic |

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**6. Key Process Parameters to Control**
- **Moisture Content** (10-30% for gelatinization).
- **Temperature Profile** (depends on starch type & modification).
- **Screw Speed & Shear** (affects degradation).
- **Residence Time** (longer for chemical reactions).
- **pH** (if using chemical modifiers).

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**7. Applications of Extruded Modified Starch**
- **Food Industry**: Thickeners, stabilizers, resistant starch.
- **Biodegradable Plastics**: Thermoplastic starch (TPS) for packaging.
- **Pharmaceuticals**: Binder, disintegrant.
- **Textiles & Adhesives**: Modified starches for sizing agents.

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 **Conclusion**
Twin-screw extrusion is a **versatile, scalable, and eco-friendly** method for starch modification. By adjusting screw design, temperature, and additives, you can produce various modified starches with tailored properties for different industries.
 

Detailed Photos

 

The starch is subjected to a wetting treatment so that its moisture content is about 20% and is introduced into an extruder. The temperature of the heated part of the extruder is as high as 120 ° C to 200 ° C and the pressure can be 3-10MPa.
The starch is pushed forward by the screw in the extruder and released through the die hole of a few millimeters. Due to the high pressure difference between the inside of the extruder and the outside atmosphere, the starch is instantly expanded and dried to achieve the pre-gelatinization effect. The screw extrusion process is characterized by continuous production, low energy consumption, low investment, and simple equipment.

Model	Installed Power	Production Capacity	Dimension
TSE65	77KW	100KG/H-150KG/H	19000*1300*2200mm
TSE70	108KW	200KG/H-250KG/H	21000*1300*2200mm
TSE85	120KW	300KG/H-500KG/H	30000*1500*2600mm
TSE90	150KW	500KG/H-1000KG/H	32000*1500*2600mm