Source: Link Testing Instruments co.,ltd
In order to have a good tearing performance, the bag body for packaging cocoa powder is often provided with an easy-to-tear opening, and the jagged easy-to-tear opening is one of them. However, not all jagged easy tears have good tear performance. This is because the tear performance of such easy tears is related to the shape of the cut and the composite fastness of the packaging bag. Improper shape setting or low composite fastness of the packaging bag, delamination easily occurs during the tearing process, which will seriously affect the tear performance of the jagged easy tear. Therefore, strengthen the monitoring of the tear performance of the easy tear to improve The easy opening of the packaging bag is of great significance.
The tearing performance of the zigzag easy-tear opening can be monitored by two indicators of right-angle tearing force and peeling strength. The right-angle tearing force is to simulate the tearing process of the jagged easy-tear opening, which is required for testing the tearing easy opening. The force value and peel strength are used to monitor the composite fastness of the packaging bag. Through the test of the above indicators, the difficulty of tearing the jagged easy tear can be obtained.
Quality problems: The roll film used for coffee inner packaging bags is prone to slipping during the bag making process.
Cause Analysis:
(1) Packaging materials
l The coefficient of friction is low or uneven-if the friction coefficient between the inner and outer layers of the packaging film, between the inner layer of the film and the surface of the reel, or between the outer layer of the film and the surface of the reel, is low or uneven The problem is that the phenomenon of slipping or deviation is easy to occur in the process of film rolling.
(2) Packaging equipment
l non-smooth pumping reel-The friction coefficient between the packaging film and the surface of the reel is not only related to the performance of the film surface, but also related to the smoothness of the reel surface. If the surface of the reel is not smooth, it is also easy to appear Problems such as poor unwinding and deviation.
Expert advice:
——Strengthen the monitoring of the performance indicators of the friction coefficient of packaging materials.
——Add an appropriate amount of slip agent, anti-blocking agent and other additives, and ensure the uniformity of their distribution.
——Check the packaging equipment regularly.
Typical quality cases:
——Test sample: Aluminized composite film for coffee small packaging bags (the company reported that the roll film is prone to deviation during bag making).
—— Targeted testing items: friction coefficient (inner layer and outer layer), friction coefficient (inner layer and steel plate), friction coefficient (outer layer and steel plate).
——Test results: The friction coefficient between the inner and outer layers of the sample is not uniform. The maximum static friction coefficient is 0.213, the minimum is 0.167, the maximum dynamic friction coefficient is 0.152, and the minimum is 0.098; the static friction between the inner layer and the steel plate The coefficient is 0.251, the dynamic friction coefficient is 0.210; the static friction coefficient between the outer layer and the steel plate is 0.196, and the dynamic friction coefficient is 0.173. Therefore, through the analysis of the three pairs of friction coefficients, the uneven friction coefficient between the inner and outer layers of the sample may be the main reason for the deviation of the sample.
Quality issues:
The cartons used for the transportation or storage of coffee products are often crushed and damaged.
Cause Analysis:
——Carton material
l The carton's compression resistance is poor-if the carton is of poor quality, or the size of the carton is not properly designed, the carton's compression resistance is poor, and it is prone to deformation and damage under small external force.
——Storage process
l Stacking too high-If the stacking of coffee products is too high during storage or transportation, which exceeds the load-bearing range of the carton, it will easily cause the carton to be deformed and damaged.
Expert advice:
——Pay attention to the monitoring of indicators such as the compressive strength and stacking capacity of cartons.
——In the process of carton production, attention should be paid to the reasonable matching of paper, structure and size design, and moisture content.
——During storage and transportation, design the stacking height and the number of layers reasonably.
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