Automatic Single Head Onion Skin Tube Filling & Sealing Machine
Advanced Monobloc Hermetic Sealing for Breakable Glass Ampoules & Biological Indicators
In high-stakes technical manufacturing, handling fragile, ultra-thin glassware requires a level of engineering precision that standard packaging machinery simply cannot provide. The Automatic Single Head Onion Skin Tube Filling & Sealing Machine from Harsiddh Unimach Pvt. Ltd. is a highly specialized, pioneering monobloc solution engineered specifically to automate the processing of crushable glass ampoules, thin-walled onion skin tubes, and biological indicators.
Designed and manufactured in India to meet strict global manufacturing protocols, this machine eliminates the high breakage rates, inconsistent sealing, and labor-intensive processes associated with conventional handling systems. By integrating a gentle, highly stable transport mechanism with precision liquid dosing and specialized flame-sealing technology, it provides a safe, repeatable, and airtight packaging environment for high-value technical and sterile liquids.
Engineering Innovation for Ultra-Fragile Glassware
Standard liquid fillers often apply excessive mechanical stress, causing micro-fractures or catastrophic breakage in ultra-thin glass tubes. The specialized engineering from Harsiddh Unimach Pvt. Ltd. addresses these challenges through dedicated technological advancements:
- The Angle Travel Principle: The machine transports delicate glassware using a proven angled travel framework. This layout minimizes gravitational shock and ensures that tubes with minor variations in neck dimensions or glass thickness are cradled and processed with absolute uniformity.
- Breakage-Preventing Rectangular Transport: Moving away from standard high-friction rotary tracks, this machine features an innovative eccentric rectangular transport rack. The system lifts, advances, and places the tubes smoothly, completely eliminating lateral friction and glass-on-glass impact.
- Rapid, Toolless Changeovers: R&D laboratories and contract manufacturers frequently switch between different product runs. The machine effortlessly adapts to tube diameters ranging from 6mm to 15mm with minimal change parts, slashing production downtime.
Step-by-Step Monobloc Operational Workflow
Efficiency and product integrity depend entirely on the seamless, sequential execution of container movement, environmental control, liquid dosing, and hermetic sealing.
[Delicate Glass Feed] ➔ [Pre-Nitrogen Purging] ➔ [Volumetric Piston Dosing] ➔ [Post-Nitrogen Purging] ➔ [Gas-Flame Sealing] ➔ [Sleepy Tray Collection]1. Synchronized Star Wheel Feeding
Fragile onion skin glass tubes are loaded into the hopper, where a custom-profiled, synchronized star wheel gently segregates them. The star wheel transitions each delicate tube into the eccentric rectangular walk-beam mechanism without applying abrupt mechanical force, keeping glassware completely intact.
2. Pre-Filling Oxygen Displacement (Nitrogen Purging)
For many biological indicators, veterinary serums, and advanced agro-chemicals, exposure to atmospheric oxygen causes rapid degradation. Before any liquid is introduced, an integrated purging nozzle descends into the glass tube, flushing the interior with inert nitrogen gas to create an optimal, oxygen-free environment.
3. High-Accuracy Volumetric Liquid Dosing
Once the tube is stabilized beneath the single filling head, a high-precision volumetric piston pump dispenses the liquid dose. Capable of accurately filling volumes ranging from 0.5ml to 25ml, the pump assembly features a clean, drip-free cutoff mechanism. This ensures that no fluid drops contaminate the upper neck of the tube, which would otherwise cause charring and compromise the subsequent sealing process.
4. Post-Filling Purging & Dual-Stage Sealing
Following a second round of nitrogen purging to lock out atmospheric air, the tube advances to the sealing station. The machine utilizes a highly precise, regulated mixture of Liquefied Petroleum Gas (LPG) and Oxygen (or Oxy-Hydrogen, depending on facility setups) across a dual-stage thermal profile:
- Pre-Heating Phase: The glass neck is gradually exposed to a controlled flame to normalize temperature and prevent thermal shock or cracking.
- Hermetic Fusion Sealing: The glass reaches its optimal melting point, and a smooth mechanical draw-off or fusion system seals the tube tip, creating a perfect, airtight, tamper-proof dome closure.
5. Touch-Free “Sleepy Tray” Discharge
Because freshly sealed glass tips remain exceptionally hot and sensitive to thermal cracking, the machine avoids sudden drops or harsh mechanical drops. The finished onion skin tubes are gently diverted down a specialized incline into a cushioned “sleepy tray” collection unit. This allows for safe, touch-free cooling and easy operator retrieval.
Key Technical Features & Manufacturing Standards
- Premium Hygienic Construction: To comply with the rigorous sanitation demands of modern laboratories and chemical plants, all product contact components are machined from superior-grade Stainless Steel 316. The robust structural enclosure and frame are built entirely from SS 304.
- Compact Monobloc Footprint: The integration of feeding, purging, filling, sealing, and collection onto a single, compact chassis makes this machine the perfect addition to cleanrooms, mobile processing units, and space-constrained R&D laboratories.
- Fine-Tuned Flame Control: The gas management manifold features independent flow meters and needle valves for LPG and Oxygen, allowing operators to adjust flame intensity precisely to match different glass wall thicknesses.
- No Tube, No Fill Safety Interlock: Advanced optoelectronic sensors are positioned along the track. If a station is empty due to a gap in feeding, the liquid dosing pump and gas nozzles automatically skip that cycle, preventing fluid waste and hazardous overspray.
Primary Industry Applications
The unique ability to delicately fill and hermetically seal onion skin glassware makes this machine invaluable across several technical sectors:
- Pharmaceuticals & Medical Diagnostics: Perfect for filling and sealing sterile biological indicators used to validate autoclave and sterilization cycles, as well as fragile glass ampoules containing sensitive chemical reagents.
- Veterinary Medicine: Ideal for packaging single-dose specialized veterinary vaccines, serums, and concentrated nutrient fluids.
- Agro-Chemicals & Insecticides: Extensively utilized for packing concentrated agro-insecticides, pest-control chemical markers, and specialized liquid crop stimulants that require airtight glass isolation.
- Academic & Industrial R&D: Highly favored by pilot plants and research institutes for small-to-medium batch testing of volatile compounds, standard reference materials, and reactive chemical solutions.
Strategic Business Benefits
Integrating this automated system into your production floor provides measurable operational advantages:
- Drastic Reduction in Glass Waste: The combination of the eccentric transport rack and the angle travel principle practically eliminates glass breakage, protecting your material investment and keeping lines running cleanly.
- Guaranteed Product Stability: The dual-stage nitrogen flushing combined with reliable, leak-proof fusion sealing guarantees a hermetic barrier, extending product shelf life and maintaining chemical potency.
- Low Operator Intervention: The fully automated monobloc workflow reduces the risk of human-introduced contamination and shields operators from handling volatile chemicals or hot glassware directly.
Technical Specification
| Specification | Details |
|---|---|
| Number of Heads | Single Head (Filling & Sealing) |
| Compatible Glassware | Onion Skin Tubes / Crushable Ampoules |
| Tube Size Range | Dia. 6mm to 15mm | Length 55mm to 100mm |
| Production Output | 10 to 15 Tubes / Minute |
| Filling Capacity | 0.5ml to 25ml in Single Dose |
| Filling Accuracy | +/- 1% |
| Gases Required | LPG & Oxygen (for Opening & Sealing) |
| Power Requirements | 0.5 H.P., 3-Phase or 1-Phase Options |
| Overall Dimensions | 750mm (L) x 500mm (W) x 1000mm (H) |
Partner with Harsiddh Unimach Pvt. Ltd. for Precision Automation
At Harsiddh Unimach Pvt. Ltd., we understand that niche packaging applications demand highly customized engineering. Our Automatic Single Head Onion Skin Tube Filling & Sealing Machine delivers the gentle handling, dosing accuracy, and thermal precision necessary to safeguard your delicate glassware and high-value formulations.
Upgrade your laboratory or industrial production line with specialized automation that maximizes yield and ensures uncompromised quality. For custom engineering consultations, multi-size tooling options, or to receive a comprehensive technical proposal, reach out to our technical engineering division today.
- Official Website: www.harsiddhunimach.com
- Inquiries & Technical Support: info@harsiddhunimach.com
Frequently Asked Questions
What is the production capacity of the Single Head model?
The Single Head configuration is specifically designed for R&D laboratories, pharmaceutical colleges, and pilot-scale production. It typically achieves a consistent output of 20 to 30 tubes per minute (approximately 1,200 to 1,800 per hour). It provides the same precision as high-speed industrial lines but in a compact, manageable footprint.
How does the machine handle such fragile glass without cracking it?
To minimize mechanical stress, the Harsiddh Single Head machine utilizes a Synchronized Walking Beam Transport System equipped with custom-contoured grippers made of medical-grade engineering plastics. This ensures the tubes are cradled securely but gently as they move through the nitrogen flushing, filling, and flame-sealing stations.
How is the sealing process managed for such thin glass?
The machine employs a precision Oxygen-LPG Flame Sealing system. Because onion skin glass melts very quickly, the flame intensity and exposure time are finely calibrated via the PLC interface. This allows for a perfect "tip seal" or "dome seal" that is hermetic and aesthetic, without overheating the sensitive chemical reagents inside the tube.
What are the key cGMP and construction features of this machine?
Despite its smaller size, this machine is built to the highest cGMP industrial standards:
Material Integrity: All liquid contact parts are made of SS 316L, while the exterior frame is polished SS 304 stainless steel.
Dosing Accuracy: Equipped with a high-precision volumetric syringe or peristaltic pump, providing an accuracy of ±1%.
Cleanroom Ready: The slim, linear design is optimized for placement under a Laminar Air Flow (LAF) unit to maintain a sterile environment during the filling process.
Safety: Includes a "No Tube – No Fill" sensor to prevent liquid wastage and an integrated safety shield to protect the operator from the sealing flames.
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