Kvantron Preform Inspection Machine

The system is installed on the production line after the molding machine. The flow of preforms passes through the inspection zone, where cameras capture images of the products against an adjustable backlight. After analysis, preforms are sent further to storage or, if necessary, a signal is sent for rejection or conveyor switching.

The solution is designed for early detection of defects, reduction of defective output, and improved process stability.

Inspection is based on thorough optical analysis of preforms under transmitted light. Preforms move along the inspection table made of wear-resistant, impact-proof glass, with a LED backlight underneath. Cameras capture the image of the product, after which Kvantron Smart software processes the frame, highlights the preform, normalizes position, and analyzes defects.

The system compares current preform images with the reference color set by the operator, and detects deviations by transparency, tint, and color intensity. This enables detection of batches with insufficient or excess coloring, yellowing, darkening, or other color deviations. According to relevant documentation, comparable systems can control minor color differences, including a typical threshold of ΔE > 2 for light and transparent preforms.

The operator receives a convenient interface to launch inspections, set batch parameters, monitor defect trends, and view images of rejected preforms. The system displays current operating parameters, number of produced and checked items, number of filled boxes, defect statistics, and the status of the inspection table.

The software allows you to:

• start and stop inspection;
• set article number and number of cavities;
• configure tolerance for each defect type;
• enable or disable conveyor response to specific defects;
• view thumbnails and large images of defective preforms;
• generate operator reports, defect reports and box reports;
• analyze defect trends by shift, hour, or day.

The system is custom designed for each production line and can be integrated with minimal equipment configuration changes. The inspection table is made of AISI 304 stainless steel, equipped with impact resistant glass and an adjustable LED backlight. The base materials indicate the recommended worktable size 700 × 400 mm. Exact size is defined during project stage for your line.

For higher inspection rate, a preform flow dividing and aligning device may be used, which lowers the chance of overlapping and increases the number of correctly analyzed objects.

In base configuration, the average inspection ratio is about 85% of the total output. The rate can be increased via additional orientation and flow equalization. Preforms are not analyzed if out of view, partially framed, or blocked by other preforms during inspection.

The standard system includes:

• inspection table with backlight;
• industrial cameras;
• light-shielding screen;
• control cabinet;
• Kvantron Smart / Kvantron Preform Inspection Machine software;
• operator interface;
• light signal devices;
• report generation module;
• interfaces for connection to the production line.

The solution is intended for PET preform manufacturers, packaging industry enterprises, beverage, food, household chemicals, cosmetics, and other companies where stability of preform quality directly affects final product output.