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Making rice straw using an extruder involves processing rice straw (or rice straw powder) with other possible additives to form a consistent, straw-like shape. Here's a step-by-step guide:
### **Materials Needed:**
1. **Rice straw powder** (dried and finely ground rice straw)
2. **Binder** (natural binders like starch, cornstarch, or biodegradable polymers)
3. **Water** (for moisture adjustment)
4. **Optional additives** (colorants, strengthening fibers, or preservatives)
### **Equipment Required:**
- **Extruder** (single or twin-screw extruder)
- **Drying oven or conveyor dryer**
- **Cutting machine** (for straw-length sizing)
- **Mixing machine**
### **Step-by-Step Process:**
#### **1. Preparation of Raw Material**
- Dry rice straw thoroughly and grind it into a fine powder (particle size ~100-300 microns).
- Mix rice straw powder with a biodegradable binder (e.g., starch or PLA) in a ratio of **70:30 (rice straw:binder)**. Adjust based on desired strength.
- Add water gradually to form a dough-like consistency (~15-20% moisture).
#### **2. Extrusion Process**
- Feed the mixture into the extruder hopper.
- Use an extruder with a **round die** (typically 4-8 mm diameter for straws).
- Set extrusion temperature between **120-180°C** (depending on binder type; PLA requires higher temps).
- The extruder melts and compresses the mixture, forcing it through the die to form a continuous straw shape.
#### **3. Cooling & Cutting**
- Pass the extruded straw through a cooling chamber or water bath to solidify.
- Cut into desired lengths (e.g., 20-25 cm for standard straws).
#### **4. Drying & Finishing**
- Dry the straws in an oven at **50-70°C** for 1-2 hours to remove residual moisture.
- Optionally, coat with food-grade wax or resin for water resistance.
### **Key Considerations:**
- **Strength & Durability**: Adjust binder ratio for flexibility and water resistance.
- **Biodegradability**: Use only natural binders if full compostability is required.
- **Cost-Effectiveness**: Rice straw is cheap, but PLA/starch may increase costs.
### **Applications:**
- Eco-friendly disposable straws
- Agricultural support sticks
- Packaging materials
| Model | Main motor | Output |
| TSE65 | 22kw | 100kg/h-150kg/h |
| TSE70 | 30kw | 200kg/h-250kg/h |
| TSE85 | 55kw | 300kg/h-500kg/h |
| TSE90 | 75kw | 800kg/h-1000kg/h |
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