مقایسه تکنیک های پروسس پلیمرها برای ترموپلاستیک ها و ترموست ها
| Process | Thermoplastic (TP) or Thermoset (TS) | Advantages | Disadvantages |
|---|---|---|---|
| Injection Molding | TP, TS | It has the most precise control of shape and dimensions, is a highly automatic process, has fast cycle time, and the widest choice of materials. | It has high capital cost, is only good for large numbers of parts, and has large pressures in mold (20,000 psi). |
| Compression Molding | TS | It has lower mold pressures (1000 psi), does minimum damage to reinforcing fibers (in composites), and large parts are possible. | It requires more labor, longer cycle than injection molding, has less shape flexibility than injection molding, and each charge is loaded by hand. |
| Transfer Molding | TS | It is good for encapsulating metal parts and electronic circuits. | There is some scrap with every part and each charge is loaded by hand. |
| Blow Molding | TP | It can make hollow parts (especially bottles), stretching action improves mechanical properties, has a fast cycle, and is low labor. | It has no direct control over wall thickness, cannot mold small details with high precision, and requires a polymer with high melt strength. |
| Extrusion | TP | It is used for films, wraps, or long continuos parts (ie. pipes). | It must be cooled below its glass transition temperature to maintain stability. |
Reference of this text is: http://matse1.matse.illinois.edu/polymers/prin.html
+ نوشته شده در پنجشنبه بیست و چهارم اسفند ۱۳۹۱ساعت 13:48 توسط Polymer Eng. Corp
|