100% automated vision inspection of effervescent desiccant spiral caps — silica gel-filled closures for effervescent tablet tubes — placed inline on the conveyor after the cap assembly and desiccant filling line. Every cap inspected from the top. Every defect detected. Every batch shipped with confidence.
PlacementInline on conveyor — after cap assembly & silica gel filling line
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Single Downward CameraHigh-resolution top-view inspection of every cap
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10,000 caps / hour100% inline inspection — no sampling
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Cap TypeSpiral desiccant closures · Effervescent desiccant caps · Silica gel tube caps
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EjectionPneumatic rejection of defective caps — without stopping the line
Product Context
What Is a Spiral Desiccant Closure?
Understanding the cap being inspected is essential to understanding why 100% automated inspection is critical for this closure type.
A spiral desiccant closure — also called an effervescent desiccant spiral cap, silica gel tube cap, or plastic spiral desiccant tube cap — is a specialised pharmaceutical packaging component designed to protect effervescent tablets from atmospheric moisture during storage.
The cap is assembled in multiple steps: the plastic cap body is moulded, silica gel desiccant is dispensed into the cap, a wad (sealing disc) is placed over the desiccant fill, and the cap is sealed. These caps are then used as closures for plastic effervescent tablet tubes — where moisture control is critical to product stability and shelf life.
Why inspection matters: Each cap passes through multiple assembly steps. Any contamination introduced during silica gel filling, a missing or misaligned wad, a cap that has deformed during assembly — these defects can compromise both product integrity and patient safety. Manual inspection at this speed and volume is not feasible.
Cap Assembly Sequence
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1. Cap Moulding Plastic spiral cap body is injection moulded
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2. Silica Gel Filling Desiccant (silica gel) is filled into the cap body
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3. Wad Placement Sealing wad disc placed over the desiccant fill
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4. Sealing Cap is sealed — assembly complete
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5. Optomech Inspection ← Here 100% vision inspection on the exit conveyor
Production Line Placement
Where the Inspection Machine Fits in Your Line
The Optomech Spiral Desiccant Closure Inspection Machine is installed inline on the conveyor immediately after the cap assembly and desiccant filling machine — before the caps are collected for dispatch or loaded into packaging.
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Cap Moulding
Plastic spiral cap body moulded
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Silica Gel Fill
Desiccant dispensed into cap
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Wad Placement & Sealing
Wad placed and cap sealed
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Vision Inspection
Optomech CIS inspects every cap from above
OPTOMECH HERE
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Good Caps Dispatched
Defectives ejected pneumatically
Defective caps are ejected automatically — the line never stops for inspection.
Defect Detection
Defects Detected — Top-View Inspection
The camera looks down at each cap from above as it travels on the conveyor. The inspection software analyses the top-view image in real time — detecting every defect that is visible from the top of the assembled cap.
Black Spots & Contamination
Foreign particles, black marks, or contamination on the cap surface or within the fill area — introduced during moulding, filling, or handling
Ovality
Cap body out of round — will not seat correctly on the effervescent tube, causing sealing failure or cross-threading
Missing Wad (No Wad)
Missing wad or incorrectly placed sealing disc — a critical defect that allows silica gel to contact product or renders the desiccant non-functional
Cap Breakage
Cracked or broken cap body — structural damage introduced during moulding, assembly, or conveyor handling that compromises closure integrity
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Diameter Deviation & Custom Defects
Cap outer diameter outside specified tolerance, plus any user-defined defect criteria specific to the cap design or buyer specification
Complete Defect Specification
Black spots / contamination
Foreign particles, marks, or discolouration visible on the cap top surface
Ovality — cap out of round
Cap body deformed, not within specified circular tolerance
Missing wad (no wad)
Sealing disc absent from cap after the wad placement stage
Wad misalignment
Wad present but not correctly positioned over the desiccant fill
Diameter deviation
Cap outer diameter too large or too small — outside specified tolerance
User-defined custom defects
Any additional acceptance/rejection criteria specific to cap design or buyer specification
System Operation
How the Inspection Works — Step by Step
The Optomech inspection unit is mounted over the conveyor at the exit of the cap assembly line. No changes to the assembly machine are required — the inspection system integrates directly onto the existing conveyor.
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Caps Enter Inspection Zone
Assembled and sealed spiral desiccant caps travel on the conveyor under the Optomech inspection head — one at a time, at production speed.
02
Camera Captures Top Image
A high-resolution machine vision camera looks down at each cap. Customised LED illumination provides controlled, high-contrast lighting for reliable defect detection.
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Real-Time Software Analysis
The inspection software instantly analyses each image — checking for black spots, ovality, wad presence, diameter, and user-defined criteria. Decision: pass or reject.
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Defective Caps Ejected
Rejected caps are ejected pneumatically before they leave the inspection zone. Good caps continue on the conveyor. The last 100 defects are displayed graphically on screen.
Product Video
See the Spiral Desiccant Closure Inspection Machine in Action
Optomech Spiral Desiccant Closure Inspection Machine — Live production line demonstration
System Features
Built for Production — Not a Laboratory
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High-Resolution Machine Vision Camera
Industrial-grade camera with precision machine vision optics and customised LED lighting — delivers sharp, high-contrast images at 10,000 caps per hour, even under variable ambient lighting conditions.
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Customised LED Illumination
The lighting configuration is engineered specifically for the spiral desiccant cap geometry — maximising contrast for black spot, wad, ovality, and diameter detection simultaneously from a single top-view camera.
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Operator-Friendly Touchscreen
Large touchscreen interface displays live cap images as they pass through inspection. The last 100 defects are shown graphically — enabling operators to identify root causes and take corrective action in real time.
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Pneumatic Defect Ejection
Defective caps are ejected pneumatically in milliseconds — before they leave the inspection zone. Good caps continue on the conveyor without interruption. An ejection verification sensor confirms each reject.
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Configurable Acceptance Criteria
Tolerances for each defect type are user-definable. Defect sensitivity, size thresholds, and acceptance/rejection criteria are set through the software and stored per product — no manual recalibration at changeover.
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3-Level Access Control
User, Supervisor, and Administrator roles with separate passwords. Inspection parameters and tolerance settings are controlled and auditable — ensuring configuration cannot be changed without authorisation.
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Automated Reporting
Reports at user-defined frequency — per shift, per batch, or at scheduled times. Rejected cap images are saved to the database for quality audit reference, supplier feedback, and root-cause analysis.
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Remote Access & Online Support
Remote access enables Optomech engineers to diagnose issues, update inspection parameters, and provide support without an on-site visit — minimising downtime in your production environment.
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Inline — No Line Disruption
The inspection system installs directly on the existing conveyor after the assembly machine. No changes to cap assembly equipment are needed. Minimal footprint, rapid installation, production-ready.
Technical Specifications
System Specifications
Parameter
Specification
Inspection Speed
Up to 10,000 caps per hour
Inspection Coverage
100% — every cap inspected, no sampling
Camera Configuration
Single high-resolution downward-looking machine vision camera
Illumination
Customised LED lighting — configured for spiral desiccant cap geometry
Defects Detected
Black spots/contamination, ovality, wad presence, diameter deviation, custom defects
Rejection Mechanism
Pneumatic ejection of defective caps
Integration
Inline on customer's conveyor — after cap assembly and desiccant filling line
Interface
Operator-friendly touchscreen — last 100 defects displayed graphically
Access Control
3-level: User / Supervisor / Administrator with separate passwords
Reporting
Configurable frequency — shift, batch, or scheduled. Defect image archive included
Optomech reserves the right to modify product specifications in the interest of product development. Contact sales@optomech.in for current specifications.
Industries Served
Who Uses Spiral Desiccant Closure Inspection?
The spiral desiccant closure is a specialised component used primarily in pharmaceutical and nutraceutical packaging for moisture-sensitive effervescent products.
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Pharmaceutical Manufacturers
Effervescent tablet manufacturers — vitamin C tablets, antacid tablets, ORS (oral rehydration salts), electrolyte tablets — packaged in plastic tubes with spiral desiccant closures. A defective cap compromises moisture protection and patient safety.
Dietary supplement manufacturers using effervescent tube formats — multivitamins, fizzy vitamin tablets, sports nutrition — require desiccant closure integrity equivalent to pharmaceutical standards for product stability and shelf life.
VitaminsSports NutritionShelf Life
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Spiral Cap Manufacturers
Companies manufacturing spiral desiccant closures as a component — sold to pharmaceutical or nutraceutical packagers — require 100% outgoing quality inspection to meet buyer specifications and avoid costly returns or complaints.
Optomech has designed and manufactured machine vision inspection equipment in Hyderabad for over 40 years. Every system is built, tested, and validated at our Kukatpally facility before delivery.
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Application-Engineered System
The Spiral Desiccant Closure Inspection Machine is configured specifically for your cap dimensions, line speed, and defect criteria. We do not ship generic machines — every system is validated for your application.
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Onsite Installation & Training
Our engineers install, commission, and train your operators on-site. We stay until the system is running at specification and your quality team is fully confident with the inspection system.
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Responsive Service Support
Dedicated service contact for rapid response to any technical issue. Remote access capability enables fast online diagnosis and parameter updates — minimising downtime in your production environment.
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Proven Across Indian Industry
Hetero, ALPLA, HSIL, SSF Plastics, Gopaldas Visram, Parekhplast, and many others have trusted Optomech vision inspection systems. Our cap inspection experience spans pharmaceutical, FMCG, and industrial sectors.
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Fast Return on Investment
Labour savings from eliminating manual inspection operators, prevention of customer complaints and returns, and consistent 24/7 inspection quality typically deliver payback within 18–36 months.
A spiral desiccant closure inspection machine is an automated vision inspection system that inspects 100% of assembled spiral desiccant caps — silica gel-filled effervescent tube closures — after the cap assembly and filling line. The Optomech system uses a single high-resolution camera mounted above the conveyor, looking down at each cap as it passes through. Machine vision software analyses the top-view image in real time, detecting black spots, contamination, ovality, missing wad, and diameter deviation. Defective caps are ejected pneumatically. Inspection runs at 10,000 caps per hour with no sampling.
The system detects: (1) Black spots and contamination — foreign particles or marks on the cap surface or fill area; (2) Ovality — cap body out of round; (3) Missing or misplaced wad — the sealing disc placed over the desiccant fill; (4) Diameter deviation — cap outer diameter outside specified tolerance; (5) Any user-defined custom defect criteria specific to your cap design or buyer specification.
The wad is the sealing disc placed between the silica gel desiccant and the product inside the effervescent tube. If the wad is missing or misaligned, silica gel particles can fall into the tube and contaminate the effervescent tablets — a serious patient safety and product quality risk. Additionally, a missing wad may mean the desiccant does not function correctly, reducing product shelf life. 100% wad inspection by the Optomech system ensures every cap shipped from your assembly line has a correctly placed wad.
The Optomech Spiral Desiccant Closure Inspection Machine is placed inline on the conveyor immediately after the cap assembly and silica gel desiccant filling machine — at the point where fully assembled and sealed caps exit the assembly line. No modifications to the cap assembly machine are required. The inspection system integrates directly onto the existing conveyor, with the camera head mounted above and the controller alongside.
The Optomech Spiral Desiccant Closure Inspection Machine inspects up to 10,000 caps per hour — 100% inspection with no sampling. Every cap is imaged and assessed.
A spiral desiccant closure is a plastic cap designed to protect moisture-sensitive products in effervescent tablet tubes. It incorporates a desiccant (typically silica gel) sealed inside the cap body with a wad. The closure is also known as: effervescent desiccant spiral cap, silica gel tube cap, plastic spiral desiccant tube cap, effervescent tube closure, spiral cap with silica gel, and desiccant closure for effervescent tablets. All these refer to the same product type that the Optomech inspection machine is designed to inspect.
No. Defective caps are ejected pneumatically while the line continues running. The rejection mechanism acts in milliseconds, removing the defective cap from the cap stream without stopping the conveyor. Good caps continue forward uninterrupted. The system is designed for true inline, continuous production operation.
Yes. The inspection software allows users to define acceptance and rejection criteria — defect sensitivity, size thresholds, and inspection zones — specific to each cap design and customer specification. Product settings are stored in the system database and can be recalled quickly at changeover. If your spiral desiccant cap has specific requirements beyond the standard defect set, the Optomech engineering team will configure the system accordingly during installation and commissioning.
Ready to Achieve 100% Inspection of Your Spiral Desiccant Closures?
Eliminate contamination, missing wads, and dimensional defects before a single defective cap leaves your assembly line. Talk to our team about a demonstration on your cap type.
