Abstract : Canned packaging is an effective method for the long-term preservation of fruits and plays an important role in daily life. This article looks at can opening performance issues that are of general interest to consumers. Labthink 's NJY-20 torque meter was used to test the rotational torque required to open canned fruit samples. The basic process of testing and the testing principles of the equipment were described in detail. The equipment parameters, etc., can be referenced by the company when it detects the opening performance of the unscrewing bottle type packaging.
Keywords : canned fruits, glass bottles, screw caps, opening performance, rotational torque, opening force, torque meter
1 , the meaning
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, so as to obtain fresh food products 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 outside atmospheric pressure, and thus appears. 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, no test standards have been issued on the rotational torque of metal caps for glass 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 canned fruit sample in glass bottle.
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 testing of the sample, thereby testing the opening torque value of the cap or the size of the locking value.
4.2 Scope of application
Bottled containers: Suitable for bottled packaging medicines, foods, bottle caps, open torque value test, such as bottles, beverage bottles and so on. Hose packaging products: Suitable for hose packaging food, medicine, cosmetics, etc. Bottle cap locking, opening torque value test, such as eye drops, hand cream, shoe polish ( threaded connection ) and so on. Extended application: Suitable for tightening and opening torque values ​​of nuts and bolts, or locking and opening torque values of bottle caps and thermos flasks ( threaded connections ) . 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, etc. The torque parameters of the equipment are 20 Nm , 40 Nm , and 50 Nm . The accuracy is Class 1 and the system resolution is 0.001 Nm . Gripping range 5 mm to 170 mm (diameter). Provides dual test modes of opening force and locking force. The measurement peak is automatically maintained to ensure that the test results are accurately recorded. Overload protection, auto-zero, and fault indications are intelligently configured to ensure the safety of the user's operations. 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. Supports 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 " opening torque " and the number of samples and other parameter information.
(2) The test sample is clamped to 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
The tests were detected rotational torque of three sample bottles, canned fruit, the test results were 4.289 Nm, 4.273 Nm, 4.311 Nm .
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 to customers around the world. The testing equipment and services that can be provided include For food, daily chemical, pharmaceutical and medical devices, automobiles, health care products, and other industries, you can visit the website of Jinan Languang Co., Ltd. for information on related equipment or call us directly . The more you understand, the more trust! Labthink expects to enhance the technical exchanges and cooperation with enterprises and institutions in the industry.
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