Pla Injection

We are a company specializing in injection mold manufacturing and injection molding product production. In recent years, we have actively deployed in the field of environmentally friendly materials, especially good at mold development and mass production services for degradable materials such as PLA injection products. We provide a one-stop solution from mold design, proofing, small batch trial production to large-scale injection molding production to meet the rapid demand of the environmentally friendly product market.

 

 

 

Experience in developing biodegradable injection molds and injection molding of materials such as PLA, PBS, and PHA;

Support export to the European and American environmental protection markets, familiar with RoHS, REACH, FDA and other certification requirements;

Provide preliminary technical support such as flow analysis, thermal balance simulation, and demoulding solution design;

Own mold workshop + injection molding production line, guaranteed delivery time, cost advantage;

Critical Process Parameters and Controls for PLA Injection Molding

 

Pre-Drying (Critical!):

Temperature: 80°C (±5°C). Never exceed 100°C! (This will cause caking and pre-degradation).

Time: Typically 4-6 hours, depending on drying equipment efficiency and initial humidity.

Target Moisture Content: < 0.025% (250 ppm) or lower. A dehumidifying dryer with a dew point below -40°C is strongly recommended.

Note: After drying, the hopper must be insulated (e.g., 80°C) and sealed to prevent moisture resorption. The barrel must be emptied during shutdown.

 

Barrel Temperature:

Principle: Use the lowest possible temperature that provides good flow properties and minimize temperature gradients.

 

Typical Ranges:

Feeding Section: 160°C - 170°C (to prevent premature softening and bridging)

Compression Section: 170°C - 180°C

Metering/Homogenizing Section: 175°C - 185°C (lower for amorphous grades, higher for highly crystalline or heavily filled grades)

Nozzle: 175°C - 180°C (slightly lower than the end of the metering section helps reduce drooling)

Key: Pay close attention to the actual melt temperature and avoid exceeding 190°C for extended periods. This varies significantly between grades, so always consult the material supplier's datasheet.

 

Mold Temperature:

Amorphous PLA: 40°C - 60°C. Higher temperatures help improve surface gloss, reduce internal stresses, and minimize weld line marks.

Semi-crystalline PLA: 70°C - 110°C (or even higher, depending on the grade and desired crystallinity). High temperatures are key to promoting crystallization, but they significantly increase cooling time. A trade-off must be struck between performance (heat resistance, stiffness) and efficiency.

Influence: Mold temperature is crucial to part dimensional stability, shrinkage, internal stress, appearance, and crystallinity.

 

Injection Speed and Pressure:

Principle: Generally, medium to high filling speeds are used. High speeds help complete filling before the melt cools, reducing weld lines and improving surface quality, especially for thin-walled parts. However, jetting should be avoided.

Pressure: While ensuring complete filling and good appearance, use the lowest possible injection and holding pressures to reduce internal stress. PLA typically requires lower pressure than PS and ABS, but higher than PP.

 

Holding Pressure and Time:

Pressure: Typically set to 40% to 60% of the injection pressure. Excessively high holding pressures can increase internal stresses, leading to deformation or cracking.

Holding Time: The holding time should be long enough to compensate for melt shrinkage during cooling and prevent sink marks. However, excessive holding time can increase internal stresses. This should be determined based on wall thickness, mold temperature, and material crystallinity testing. Semi-crystalline PLA may require longer dwell times.

 

 

 

 

Food and beverage packaging: PLA disposable tableware, takeaway box lids, straw shells, etc.;

Consumer goods: cosmetic shells, travel bottle caps, environmentally friendly storage boxes;

Educational toys: degradable stationery, assembly blocks, safety toys;

Agricultural supplies: seedling boxes, planting nets, biofilm hooks, etc.;

Retail supplies: brand environmentally friendly packaging shells, gift peripherals, etc.

 

As a manufacturing factory focusing on the environmental protection field, we provide customers with high-precision and environmentally friendly PLA injection services, covering mold design, injection processing and surface treatment. Whether you need a small amount of PLA prototypes delivered quickly, or a large amount of PLA injection daily necessities for export, we have strong process assurance and production strength to inject "green" power into your brand.

 

 

 

 

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