PLA polymer 110 is a thermoplastic resin derived from annually renewable resources and is Applicable to extrusion process.
Resin Properties
|
110 |
Test Method |
| Physical Properties |
| Density（g/cm3） |
1.25±0.05 |
GB/T1033-1986 |
| Melt Index, g/10min (190℃/2.16kg) |
4.0-5.5 |
GB/T3682-2000 |
| Melting Point (℃) |
155-160 |
GB/T19466.3-2004 |
| Glass Transition Temperature (℃) |
56-60 |
GB/T19466.2-2004 |
| Mechanical Properties |
| Tensile Strength (MPa) ≥ |
50 |
GB/T1040-1992 |
| Elongation at Break (%)≥ |
3.0 |
GB/T1040-1992 |
| Impact Strength (KJ/m2, Izod) |
1-3 |
GB/T1043-1992 |
Applications
Many products can be produced from 110, and the application field of this resin is extended gradually. Suitable products including: 3D printing consumables, consumables, modified, transparent sheet, blister tray, bubble shell, IC card, earthwork and so on.
Process Details
Equipment requirements
110 is suitable for machining in traditional extrusion type wire drawing machines A sheet thickness between 10-20 mm is recommended. General equipment requirements are: screw with L/D ratio between 28:1 to 32:1 and smooth stuff barrel. Stuff is stable in melt form given it is properly dried.
Cleaning machine
PLA resin 110 is different from other resins, and special purging sequences should be followed:
1.Clean extruder and bring temperatures to steady state with low-viscosity, general-purpose polystyrene or polypropylene.
2.Contamination of hopper system should be avoid, and the humidity of the air should be kept below -40℃ air dew point.
3.PLA resin can be introduced into extruder after step 1 and 2.
4.Adjust the temperature of equipment to the operating condition.
5.When shutting down, the machine should be cleaned with low-viscosity polystyrene or polypropylene.
Note:1.It is critical that all drying and conveying/receiving systems should be free of all other contaminant and is vacuumed to ensure that there is no remaining other polymer dust before adding PLA. Since the presence of other polymer contaminant that cannot melt at PLA operating temperature will block screens.
- When cleaning extruder with polypropylene, thermally cross-linked one should be avoid.
Drying
110 has been processed by drying crystallization at our factory. Highest heat stability of the resin is 110 ℃ and the moisture content is less than 200 ppm. The resin is stored in Aluminum foil bag, protected by box or bag as the outer packaging, and can be used directly. It is more favorable if resin user can re-dry the resin with proper drying equipment and lower the moisture content to 100 ppm or less. It will enhance the process ability of the resin and the quality of the consumables. When re-drying the resin, un-dehumidified hot air is forbidden (by using un- dehumidified air, it will speed up water absorption of PLA resin and cause degradation on the resin). Only dehumidified air can guarantee good drying effect of PLA resin in desiccator.
Recommended drying conditions are as follows
| Drying Parameter |
Typical Settings |
| Residence Time（hours） |
2-3 |
| Air Temperature（℃） |
80 |
| Air Dew Point（℃） |
-（40~ 42） |
| Air Flow Rate（m3/hr-kg resin） |
＞1.85 |
Process temperature
Typical PLA solid line processing parameters
| Extrusion Area |
Temperature Setting(℃) |
| Feed Throat |
130-150 |
| Zone 1 |
175-190 |
| Zone 2 |
175-190 |
| Zone 3 |
175-190 |
| Die |
170-185 |
Note: 1.Temperature settings can be optimized during the production process.
2.If the feeding area is blocked, the temperature can be reduced to 110~130 degrees, and the cooling water cycle should be opened.
3.Because there are many kinds of extruder on the market, the actual processing temperature will be different for different screw design.
Recovery treatment of renewable materials
110 renewable materials can be recycled, waste material in the extrusion drawing collection centralized processing, after granulator particles can be used as machine cleaning materials, reduce production costs.
