PET Bottle Mouth Inspection Machine For Stable Sealing
In high-speed PET and PE bottle production, the bottle finish is a small area with a large impact. Damage, deformation, or chipping on the sealing surface can lead to poor capping, leakage, contamination risk, and unnecessary rejection after filling. The PET Bottle Mouth Inspection Machine, model MT-PK021, is designed for fully automated, non-contact online inspection of PET and PE bottle mouths. With a rated speed of 48,000 bottles per hour, it helps production teams identify defective bottle finishes before they affect filling and sealing quality.
Why Bottle Mouth Inspection Matters Before Filling
A bottle mouth defect may not be obvious during fast conveying, but it directly affects the contact area between the cap and the sealing surface. Through-holes, internal chipping, external chipping, spot chipping, and oval neck deformation are all inspection targets because they can interfere with sealing stability. For lines running at high output, manual checking is difficult to keep consistent, which is why online machine vision inspection is commonly used as a control point before downstream processes.
The PET Bottle Mouth Inspection Machine focuses on the finish area of PET and PE bottles and automatically rejects bottles with deformation or damage on the sealing surface. Its non-contact design avoids physical interference with the container while maintaining continuous inspection flow.
Working Process From Sensor To Rejector
The inspection sequence is based on coordinated tracking, imaging, processing, and rejection. When a bottle passes the positioning sensor, the control unit records the bottle ID together with the current encoder value. The sensor then triggers the camera to capture an image of the bottle mouth at the inspection position.
After image acquisition, the processor analyzes the bottle mouth image and sends the result to the HMI for real-time display. At the same time, the result is transmitted to the control unit. If the bottle is judged defective, the rejector removes the specific bottle matched to the stored ID. This closed-loop process helps the PET Bottle Mouth Inspection Machine reject only the corresponding unqualified bottle instead of interrupting the entire line.
Image Acquisition Components That Support Accuracy
Stable imaging is essential for bottle finish inspection. The system uses an LED area light source with a service life of up to 30,000 hours. Front illumination makes the inspected features clearly visible, and the bottle mouth appears as a continuous bright ring in the captured image. The specially designed bowl-shaped light source helps provide uniform illumination and reduces blind spots around the mouth area.
The imaging unit uses an area-array CCD analog camera with 640 × 480 resolution and a capture rate of up to 60 frames per second. A fixed-focus lens with manual aperture adjustment is applied. The focus ring is adjusted for image clarity on the CCD sensor surface, while the aperture ring is fine-tuned for proper brightness. Together, these components give the PET Bottle Mouth Inspection Machine repeatable visual input for automated analysis.
Detection Items And Precision
The inspection scope is concentrated on defects that influence sealing surface quality and bottle neck geometry.
| Inspection item | Minimum defect reference | Detection accuracy | False rejection rate |
|---|---|---|---|
| Through-holes | Width 0.8 mm, depth 0.25 mm | ≥99.99% | ≤0.03% |
| Internal chipping | Width 0.8 mm, depth 0.25 mm | ≥99.95% | ≤0.03% |
| External chipping | Width 0.8 mm, depth 0.25 mm | ≥99.95% | ≤0.03% |
| Spot chipping | Diameter 0.8 mm, depth 0.25 mm | ≥99.99% | ≤0.03% |
| Neck deformation or ovality | Diameter difference 2 mm | ≥99.95% | ≤0.03% |
These figures help buyers evaluate whether the PET Bottle Mouth Inspection Machine matches the required quality threshold for high-speed PET or PE packaging lines.
Site Conditions For Stable Operation
For stable operation, the installation environment should meet the specified conditions: altitude from 5 to 3000 m, ambient temperature from 5°C to 40°C, and relative humidity from 50% to 65% RH. The installation floor should meet flatness and load-bearing requirements for proper machine operation. After delivery, equipment and components should be stored in suitable facilities, with lubrication and maintenance used to prevent surface damage, corrosion, or deformation before installation and commissioning.
The operating noise level is ≤85 dB, with actual values depending on container type, machine power, building acoustics, and other environmental factors. Electrical connection is made between the customer’s main electrical cabinet and the equipment cabinet. The main power supply is 3 × 380V AC ±10%, 50 Hz, 3PH + N + PE. The lighting power supply is 220V AC, 50 Hz, single-phase, while control voltage is 24 VDC. Total power consumption is approximately 1.0 kW. Any special voltage requirement should be confirmed in advance because it may affect equipment specifications, delivery time, and cost.
Compressed air at 4–6 bar is required for rejector actuation, and the customer provides the air pipeline connection between the air source and the main unit.
Integration In PET And PE Packaging Lines
The machine is installed inside the blow molding machine, either at the bottle discharge section or on the conveyor chain. As part of broader PET Bottle Inspection Equipment, it supports online quality control without contacting the bottle. For production teams focused on sealing reliability, the PET Bottle Mouth Inspection Machine provides a practical checkpoint before defective containers move further into filling, capping, packaging, or transport.
This inspection position is especially useful in high-output production where bottle finish defects can otherwise move unnoticed into later stages. By screening the sealing surface early, manufacturers can reduce downstream quality risk, avoid unnecessary product loss, and maintain more consistent capping performance across PET and PE bottle formats.
FAQs
Does the machine touch the bottle during inspection?
No. It performs fully automated, non-contact online inspection using machine vision technology.
What bottle types are applicable?
The PET Bottle Mouth Inspection Machine is suitable for PET and PE bottles.
Where is the machine installed?
It can be installed inside the blow molding machine at the bottle discharge section or on the conveyor chain.
What defects can it detect?
It detects through-holes, internal chipping, external chipping, spot chipping, and deformed or oval-shaped bottle necks.
What utilities are required?
The system requires the specified electrical supply, 24 VDC control voltage, lighting power supply, and compressed air at 4–6 bar.
