Ultrasonic single/double sheet sensors are widely used in the food packaging industry, ensuring accurate material feeding and preventing packaging defects caused by overlapping multiple sheets. The following are some specific application examples:
- Chocolate Packaging Material Detection: Granta series ultrasonic sensors are used in the chocolate packaging process. Chocolate packaging requires a variety of materials, such as cellophane and parchment paper, which are fed into the machine via rollers. The sensor monitors the unwinding of the packaging material, detects changes in roller diameter, and even detects material damage. Its adjustable acoustic beam adapts to varying roller widths, avoiding false detections caused by roller edges. Automatic synchronization mode prevents crosstalk between sensors, ensuring an uninterrupted packaging process.
- Instant Noodle Film Feed Detection: Ultrasonic single/double sheet sensors are used to detect the feeding of packaging film on instant noodle packaging lines. Instant noodle film is typically thin, and the sensor can quickly and accurately determine whether a single sheet is doubled, ensuring that only one sheet of film enters the packaging process at a time. This prevents problems such as poor sealing and inaccurate package dimensions caused by overlapping multiple sheets, thereby improving packaging efficiency and product quality.
- Milk Powder Wrapper Inspection: During the packaging process of powdered foods like milk powder, ultrasonic single/double sheet sensors are used to detect the feeding of wrapping paper or labels. For example, the Granta ultrasonic double sheet detection sensor for printers can be applied to milk powder packaging machinery. It can accurately detect paper weighing 20g to 1200g, ensuring single-sheet feeding of wrapping paper. This ensures accurate label application, neat packaging, and reduces defective product rates.
- Food Packaging Carton Feed Inspection: Some foods (such as biscuits and candy) are packaged in cartons. During the carton forming and boxing processes, ultrasonic single/double sheet sensors can detect the feeding of cardboard. The sensors reliably identify individual sheets, preventing multiple sheets from entering the forming or boxing equipment simultaneously. This ensures carton forming quality and a smooth boxing process, avoiding equipment failure and material waste.
- Food Packaging Aluminum Foil Inspection: Aluminum foil is often used as a packaging material in vacuum or nitrogen-filled packaging of foods such as meat and seafood. Ultrasonic single or double sheet sensors can detect the conveying of aluminum foil. Because aluminum foil has a certain degree of reflectivity, traditional sensors may be affected. However, ultrasonic sensors are not affected by its gloss and reflectivity. They can accurately determine whether the aluminum foil is single or double, ensuring accurate aluminum foil feeding during the packaging process, achieving a good sealing effect, and extending the shelf life of food.