Canned fruit originated in France and was developed to extend the shelf life of fruit. The specific processing process is: after the fresh fruit is processed and processed, it is put into a packaging container and then subjected to processes such as sealed high-temperature sterilization, degassing, sealing, cooling, etc., to reduce the microbial content, thereby obtaining a preservation food with extended shelf life, and Well maintained the appearance of the fruit and nutrients. Canned fruit commonly used packaging materials are tinplate, glass and so on.
Figure 1 Common canned fruit packaging
"The canned lid is not easy to open" is for cans with canned metal caps, this statement fully explains the fruit can not easily open to consumers caused by the trouble. The reason why glass canned fruit can not be easily opened is because in the production process of cans, in order to improve the shelf life effect, the exhaust treatment is often performed before the lid is closed, so that the internal pressure of the sealed package is lower than the external atmospheric pressure, and thus appeared. Canned bottle caps are not easy to open. However, in the production process, due to different degrees of exhaust, different degrees of cold and heat content of the seal, or improper control of the capping process, glass bottles, bottle cap quality defects and other factors exist, it will lead to endless opening of the fruit cans In the same way, even excessive opening force may seriously affect the consumption of consumers, or the opening force is too small, causing problems such as poor can sealing. Therefore, it is an effective measure to improve the quality of products by strengthening the detection of the opening performance of canned cans.
2, the status quo
The detection process of this article is based on the American Standard ASTM D2063 "Test Method for Torque Retention of Screw Caps for Measuring Packages". At present, there is no standard for testing the rotational torque of metal caps for canned cans.
3, test sample
A brand of glass canned fruit.
4, test equipment
The opening performance of the swing-open bottle cap is characterized by the rotational torque value. This article uses the NJY-20 torque meter independently researched and developed by Jinan Languang Electromechanical Technology Co., Ltd. to detect the torque value of the glass jar canned fruit sample.
Figure 2 NJY-20 Torque Meter
4.1 Test principle
Using a torsion angle phase difference sensor, a strain bridge detection method is adopted to realize the monitoring of the electrical signal of the torsion of the elastic shaft during the test of the sample, thereby testing the opening torque value of the cap or the size of the locking value.
4.2 Application
l Bottled containers: Suitable for bottled packaging medicines, foods, bottle caps, open torque value test, such as bottles, beverage bottles and so on.
l Hose packaging products: It is used to test the tightening and opening torque value of the caps, such as eye drops, hand creams and shoe polishes (threaded connections) for hose-packed foods, medicines and cosmetics.
l Extended application: Suitable for locking and opening torque values ​​of nuts and bolts, or locking and opening torque values ​​of bottle caps and thermos flasks (threaded connections).
l Standard: This equipment can meet many national and international standards, such as GB/T 17876, ASTM D 2063, ASTM D3198, ASTM D3474, BB/T 0025, BB/T 0034 and so on.
4.3 Equipment Parameters
l Torque specifications 20 Nm, 40 Nm, 50 Nm, precision class 1, system resolution 0.001 Nm.
l Gripping range 5 mm to 170 mm (diameter).
l Provide double test mode of opening force and locking force.
l The measurement peak is automatically maintained to ensure that the test results are accurately recorded.
l Intelligent configuration such as overload protection, auto-clear, and fault prompting to ensure the safety of the user's operation.
l The system adopts microcomputer control, with LCD liquid crystal display screen and PVC operation panel to facilitate users to quickly and intuitively check the detection data and results.
l Support LystemTM laboratory data sharing system, unified management of test reports and test results.
5, the test process
(1) Turn on the power switch of the test equipment and set the test mode to “open torque†and the number of samples and other parameter information.
(2) Mount the test sample on the test equipment.
(3) Click on the test option and unscrew the vial cap by hand. The device automatically records the maximum torque value during the unscrewing of the cap, which is the rotational torque of the sample.
Figure 3 sample test process diagram
6, test results
A total of 3 samples of canned glass bottles were tested for rotational torque. The test results were 4.289 Nm, 4.273 Nm, and 4.311 Nm, respectively.
7. Conclusion
The magnitude of the rotational torque value has an important influence on the sealing performance and ease of use of the unscrewing bottle cap packaging container. In this paper, the rotational torque value of the canned glass bottle package was tested with the NLY-20 torque meter. The equipment is easy to operate, and the repeatability of the test results is good and the precision is high. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D of packaging testing equipment. It is always committed to providing professional, high-end packaging inspection equipment and timely and intimate packaging inspection services for global customers. The testing equipment and services provided can be covered. The food, daily chemical, medicine and medical equipment, automobile, health care products and other industries, related equipment information, you can visit or direct consultation. The more you understand, the more trust! Labthink expects to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.