Preform mouth inspection machine

The Bottle Mouth Inspection Machine utilizes advanced machine vision inspection technology to conduct fully automatic and non-contact online inspection of the deformation and damage of PET bottle mouths. The rated output is 48,000 bottles per hour. Suitable for PET/PE bottles.

Environmental Conditions

• Altitude: Recommended installation range: 5–3000 meters above sea level.

• Ambient Temperature: 5°C–40°C.

• Relative Humidity: 50%–65% RH.

• Factory Requirements: The floor levelness, load-bearing capacity, and related parameters must comply with national standards to ensure stable equipment operation.

• Storage Requirements: After delivery, equipment and components should be stored in facilities that meet national standards. During storage, appropriate lubrication and maintenance are required to prevent surface damage, corrosion, or deformation that could affect installation, commissioning, or performance.

Operating Conditions

• Noise Level: ≤85 dB (actual values may vary depending on container type, equipment power, and site acoustics).

• Power Supply: Connection provided between the customer’s main electrical cabinet and the equipment cabinet.

• Main Power: 3 × 380V AC ±10%, 50 Hz, 3PH + N + PE.

• Lighting: 220V AC, 50 Hz, single-phase.

• Note: Special voltage requirements must be confirmed in advance, as they may affect specifications, delivery, and cost.

• Total Power Consumption: Approx. 1.0 kW.

• Control Voltage: 24 VDC.

• Compressed Air: 4–6 bar (customer to provide air pipeline connection from the source to the equipment).

Equipment Description

Bottle Finish Inspection Machine

• Model: MT-PK021

• Quantity: 1 set

• Production Speed: 48,000 bottles/hour

• Compatible Containers: PET/PE bottles

• Applicable Production Line: PET/PE bottle packaging lines up to 48,000 bottles/hour

• Installation Position: Inside the blow molding machine at the bottle exit point, or alternatively on the conveyor system.

• Function: Uses vision inspection to detect deformation or damage on the bottle finish (mouth area) and automatically removes defective bottles.

4.2 System working principle and process

Figure 4: System Principle and Workflow

System Operating Principle and Process

1. As a bottle passes the positioning sensor, the sensor detects its presence and the control unit records the bottle ID along with the corresponding encoder value.

2. The sensor then triggers the camera to capture an image of the bottle finish. Once the image is acquired, it is processed by the image processor. The results are sent both to the human–machine interface (HMI) for real-time visualization and to the control unit, which prepares instructions for rejecting any bottles identified as defective.

3. When the control unit receives a rejection signal, it activates the rejector to remove the defective bottle corresponding to the recorded ID from the production line.

4.3 Image Acquisition Components

• Light Source:
  Equipped with a high-performance LED area light source with an expected service life of up to 30,000 hours. Using forward illumination, it provides a clear representation of the measurement object. In the captured image, the bottle finish appears as a continuous bright ring. A fixed-focus manual aperture lens is used; the focus ring is adjusted to ensure the sharpest image on the CCD sensor, while the aperture ring is fine-tuned to achieve optimal brightness.

• Camera:
  Uses an area-array CCD analog camera with a resolution of 640 × 480 pixels and a frame capture rate of up to 60 frames per second, ensuring accurate and efficient image acquisition.

4.4 Bottle mouth detection module:

image processing process

4.5 Test Content and Accuracy:

4.5.1 Test Content

A. Through-hole

B. Internal chip

C. External chip

D. Point chip

E. Deformed bottle neck (oval)

4.5.2 Detection Accuracy