Injection Moulding Machine for Thick-Wall Acrylic and SAN Jar Shells
Thick-wall acrylic and SAN outer jar shells are made on horizontal injection moulding machines, often in moulds with few cavities, from PMMA, SAN and PETG. Shot weight against barrel capacity, mould height and cavity count set the machine size. Slow, long packing and cooling decide whether the heavy wall comes out free of sinks and voids.
Machine selection for heavy shells focuses on a barrel sized to the shot, steady holding pressure over a long pack and enough cooling capacity. Pratishna Engineers supplies horizontal injection moulding machines for thick-wall cosmetic jar shells and can recommend a configuration from your part weight and mould.
Moulding Thick-Wall Acrylic Jar Shells?
Share the shell drawing, part weight, material and mould size, and Pratishna Engineers will recommend a machine and barrel size.
Machine Requirements for Thick-Wall Jar Shell Moulding
A heavy clear wall is unforgiving, and each rejected shell wastes a lot of resin. Machine choice should cover:
- Barrel and screw sized to the heavy shot weight
- Long, steady holding pressure to pack out sinks and voids
- Dryer capacity for PMMA, SAN and PETG before moulding
- Mirror-polished cavity and core for a clear wall
- Mould temperature control for long, cooling-dominated cycles
- Short residence time so PMMA does not yellow
Recommended Machine for Thick-Wall Acrylic Jar Shells
Jar shells are heavy for their size, so shot weight and barrel capacity often decide the machine before clamping force does. The C Series (140-320 T) suits most shell moulds, and the H Series (120-350 T) takes larger shells or more cavities. Small single-cavity shells can run on the E Series (75-180 T). Larger heavy-wall shells are reviewed on request.
Not Sure Which Machine You Need?
Send the shell weight and mould size to get a matched barrel and machine.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
- In-House Engineering & Manufacturing
- Multiple Machine Series
- Production-Focused Solutions
- End-to-End Technical Support
- Industry-Specific Solutions
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Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Horizontal Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: product weight, projected area, number of cavities, plastic material, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KBCosmetics & Personal Care Components & Machine Guide
A guide to Cosmetics & Personal Care components, covering compacts, lipstick cases, cream jars, caps, pumps, combs, brushes and hair accessories. It explains cosmetic surface finish, thick-wall clear parts, precise mating components, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
Points that come up when moulders plan acrylic and SAN jar shells.
Which Injection Moulding Machine Is Used to Make Thick-Wall Acrylic Jar Shells?
Shells are usually moulded on mid-size horizontal machines picked by shot weight first. The C Series covers most moulds, the H Series takes larger or multi-cavity shells, and small shells can run on the E Series.How Are Sinks and Voids Avoided in a Thick Acrylic Wall?
Gate into the thickest section, fill at a moderate speed and hold pressure long enough for the wall to freeze from the outside in. Cutting pack time short leaves sinks on the face or voids inside the clear wall.Why Must PMMA Be Dried Before Moulding Jar Shells?
PMMA picks up moisture from the air, and in a clear part that moisture shows as splay or silver streaks. Dry the granules in a dehumidifying dryer to the resin supplier’s settings and keep the hopper covered.
Can PETG or PP Be Used Instead of Acrylic?
PETG gives a clear, tougher shell but needs careful drying. SAN is another clear option with good chemical resistance. PP is usually kept for the inner cup, as it is not glass-clear. PETG and acrylic bottles are blow moulded, a different process.Can Pratishna Recommend a Machine for My Acrylic Jar Shell?
Yes. Share the shell drawing or sample, material, part weight, mould dimensions, number of cavities and monthly volume, and Pratishna Engineers will recommend a suitable machine and barrel.Does the Machine Suit Other Cosmetic Jar and Case Parts Too?
Yes. Machines of this size can also mould cream jar bodies and lids, compact cases, salon appliance housings and deodorant stick barrels, subject to the mould.
Technical Disclaimer
Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.
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Planning a New Injection Moulding Project?
Share your component, material, mould and production target. Our engineering team will help you identify the right machine configuration.
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