What is “Thin Wall Injection Molding”?
Thin wall parts are classed as such based on their flow length to wall thickness (or L/t) ratio. Each plastic material has different flow properties so each family of resins has different maximum L/t ratios. The table below shows maximum L/t ratios for some common materials – figures that approach these high values would be considered thin walled. These values are based on a 2.0mm wall section,maximum L/t ratios reduce as the wall thickness gets thinner.
- Wall thickness often <0.6 mm.
- Parts with flow ratio > 150.
- High Injection pressure.
- High Injection speed.
- Applications for containers in packaging and storage as well as disposable use.
| Material | ABS | PA | HDPE | LDPE | PP | POM | PS |
|---|---|---|---|---|---|---|---|
| Maximum L/t Ratio | 170/1 | 150/1 | 225/1 | 275/1 | 250/1 | 150/1 | 200/1 |
| *Flow length & thinness ratio of normal injection materials… | |||||||
