With the development of automatic packaging industry, there will be more and more demand for dynamic check weigher for various quality control applications. Check weigher is a high speed and precision automatic dynamic online weight-checking equipment, it is use for checking if the product weight on the conveying-belt is comply to the setting target weight with tolerance, and also is able to auto-reject the less-weight or over-weight products.
1. Main structure of Check weigher machines
Check weigher machine refer to dynamic weighing devices controlled by main board to execute weight-checking task traditionally performed by manual operators. Normally there are three sections on a full unit, guide-loading section by manual or up-steam production line, weighing belt section and automatic rejecting system base on exact project request, such as weight range, expected running speed and accuracy, widely apply for bag, pouch, bottle, bucket or carton package type in food, pet food, hardware, plastic, pharmaceutical or electrical appliances industry, etc.
2. Working principle of Check weigher machines
1-The in-order products with equal distance go into the weighing-belt;
2-When the product pass the front photo-sensor on the weighing-belt, it start to weigh;
3-During the period the product pass through the weighing-belt, the load cell will finish the weighing with AD technology and display the weight on the screen;
4-It will compare the displayed weight with the setting target weight include the tolerance, and distinguish the qualify and unqualified products, the over-weight and less-weight will be auto-rejected; all the weighing records will be saved or printed (option).
3. Benefits of Check weigher
- Product quality control avoid the client’s complaints;
- Save material cost and reduce over-weight times;
- Online dynamic high speed weighing without influence the normal production;
- Stable performance with low maintenance
4. Different Type Check weigher available
Many models are available for different project requests as below:
- Tabletop mini floor statics : for small sachets less than 100g.
- 100 (High speed 80-100PPM): Belt width 100mm for high speed bottle line.
- 220/300/400(1-5kg 40-60PPM): Belt width 200/300/400mm for pouch/box.
- 500/600 (Heavy duty roller 5-30PPM): Big/large package bag or carton
- Multiple Weight Grading(8-24 Weight Sorting) for piece weight classifying
5. Factors to Consider When Purchasing check weigher
When choose a suitable check weigher machine, several critical factors influence the decision-making process:
- Package size and Weight: Choose best belt size and load cell capacity
- Speed and Accuracy: Ensuring running efficiency and error performance.
- Rejecting System: Air blasting, Flipper-arm, Cylinder-pusher or belt drop, etc
- Running Direction: From left to right or from Right to left
- IP grade level: Compatible washable or corrosive level for different project
All the above factors ensures that check weigher machine align with project request requests, maximizing productivity and return on investment.
6. Conclusion
In conclusion, check weigher is playing more and more importance roles in quality control process, especially in food packaging industry, and provide high speed and high accuracy weight checking solution for various food or non-food industry in order to enhance company product image and meet the market request. After understanding their classification model according to project package size, speed and accuracy, and rejecting system, which will be helpful for the clients to make correct decisions to optimize production line. With the advantage benefits of check weigher machine not only improves production qualification rate but also comply with the commitment to food quality in the competitive global market.
