RAJNA compound range · injection moulding material
RAJNA-i1126 crystallisable PLA compound for injection moulding
A low-viscosity, PLA-based compound developed for injection-moulded cutlery, cups, plates and other products where controlled crystallisation and improved heat performance are required.
Key characteristics of RAJNA-i1126
RAJNA-i1126 is a low-viscosity compound developed for injection moulding. Its thermal behaviour is strongly influenced by the crystallinity generated during processing. Rapid cooling generally produces a more amorphous structure, while an elevated mould temperature can promote partial crystallisation.
Important: these figures are processing and product guidance values stated in the current product description. Actual part performance also depends on drying, machine configuration, mould design, geometry, residence time, cycle time and other process parameters. Production trials and measurements are required before serial manufacture.
Typical application areas
The compound is intended for injection-moulded products where low viscosity, reliable mould filling and the option of in-mould partial crystallisation can provide a technical benefit.
Cutlery
Spoons, forks, knives and similar thin-walled products, subject to validation of part geometry, mechanical performance and intended use conditions.
Cups and plates
Injection-moulded cups, plates and related products developed with suitable mould-temperature control and an appropriate crystallisation cycle.
Custom moulded products
Components where a PLA-based matrix, low melt viscosity and controllable crystallisation are important selection criteria.
How crystallinity affects heat performance
The heat performance of RAJNA-i1126 is not a single value that remains unchanged under all moulding conditions. Rapid cooling can produce a more amorphous structure and lower HDT, while an elevated mould temperature can support partial crystallisation.
Processing relationship
- Rapid cooling: more amorphous and generally more translucent structure.
- Amorphous condition: stated HDT of approximately 57 °C.
- 100–120 °C mould: increased opportunity for crystallisation.
- Partial crystallisation: more opaque appearance and potentially higher heat resistance.
- Required cycle time depends on geometry and the target crystallinity.
Processing and drying guidance
RAJNA-i1126 can be processed on many conventional injection moulding machines. As a PLA-based material, however, moisture control and melt residence time require particular attention.
| Processing equipment | Conventional injection moulding equipment. Machine sizing should support the shortest practical barrel residence time. |
|---|---|
| Mould temperature | The current product description states an elevated range of 100–120 °C for promoting partial crystallisation. |
| Recommended moisture content | Below 0.025%, equivalent to 250 ppm, to reduce the risk of hydrolytic viscosity loss. |
| Condition at delivery | The current product description states delivery in a foil-lined box or bag at a moisture content below 400 ppm. |
| Drying | Inline drying is recommended. Material in an amorphous condition should be dried below 50 °C. |
| Material handling | After drying, the material should be protected from renewed exposure to ambient humidity. |
Barrel temperatures, injection pressure, holding pressure, injection speed, cycle time and cooling must be established for the specific machine, mould, wall thickness and target crystallinity. This page deliberately does not present a single universal moulding recipe.
Food-contact applications
According to the current manufacturer product description, RAJNA-i1126 is formulated to meet the applicable raw-material requirements of Commission Regulation (EU) No 10/2011 on plastic materials and articles intended to come into contact with food, including relevant amendments.
Raw-material documentation
The current declaration of compliance, technical data sheet and batch-related documentation should be requested and reviewed before a project or production run is approved.
Request documentationFinished-product compliance
Compliance of the moulded article does not follow automatically from the status of the raw material. Migration testing must be designed for the actual food or simulant, contact time, temperature and intended conditions of use.
Discuss compliance requirementsCompliance notice: before manufacturing a food-contact article, always verify the latest formulation status, supplier documentation, restrictions of use and finished-product testing requirements. No statement on this page replaces a formal compliance assessment of the final article.
Frequently asked questions about RAJNA-i1126
Why is an elevated mould temperature important?
It can provide the thermal conditions and time required for crystallisation, which may increase the heat deflection performance of the moulded part.
Is heat resistance above 100 °C guaranteed for every product?
No. It depends on processing conditions, crystallinity, part geometry and the test method. The required value must be verified on the actual finished product.
Why must the material be dried?
Moisture can cause hydrolysis during processing of PLA-based materials, reducing molecular weight, melt viscosity and final performance.
Can RAJNA-i1126 be processed on a conventional injection moulding machine?
According to the current product description, yes, provided that moisture control and the shortest practical melt residence time are maintained.
Does the raw material automatically make the final article food-contact compliant?
No. Raw-material documentation is only one part of the compliance process. The finished article must be assessed and, where required, migration-tested under its actual use conditions.
Do you need RAJNA-i1126 trial material or technical support?
Send Tibor Sipos the intended product geometry, wall thickness, service temperature, food-contact conditions and estimated annual volume. Based on this information, Friend Plastic can assess the suitability of the compound and define the required processing and validation steps.