Biodegradable materials, by definition, change their chemical and potentially physical form upon contact with the biological environment. There are two distinct stages to the biodegradation process, especially in bulk degradation. The first stage is restricted to the random cleavage of molecular linkages. The resulting decrease in molecular weight produces some change in mechanical properties and morphology, but no weight loss (Brannon-Peppas 1997). The second stage involves a measurable weight loss in addition to chain cleavage. It begins when the molecular weight of the polymer has decreased to the point that chain scission produces oligomers that are small enough to solubilize and diffuse out from the network. These oligomers are necessarily released into the adjacent tissue and therefore should be biocompatible. PLA/PP Biodegradable plastic drinking straw extruder
1. The unit is composed of an extruder, mold, forming water tank, traction cutting, etc.
| Model | Screw diameter（mm） | L/D | Main motor（Kw） | Product size (mm) |
| One color | Ф50 | 25 | 7.5 | Ф1-Ф10 |
| Two-color | Ф50*1
Ф25*1 |
25 | 7.5
0.75*1 |
Ф1-Ф13 |
| Three-color | Ф50*1
Ф25*2 |
25 | 7.5
0.75*2 |
Ф1-Ф13 |
| Model | Screw dia（mm） | L/D | Main motor（Kw） | Product size (mm) |
| One color | Ф50 | 25 | 7.5 | Ф1-Ф10 |
| Two-color | Ф50*1
Ф25*1 |
25 | 7.5
0.75*1 |
Ф1-Ф13 |
| Three-color | Ф50*1
Ф25*2 |
25 | 7.5
0.75*2 |
Ф1-Ф13 |
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