Performance test of coffee packaging film

Coffee packaging film can extend the freshness of coffee, it directly affects the flavor of the coffee. For coffee packaging film, need to pay attention to the following features, to guarantee the quality of the coffee. 1. If the friction coefficient of coffee packaging film packaging film, volume between the inner layer and outer layer of membrane between the inner and scroll surface or volume membrane between the outer and scroll surface friction coefficient is low or uneven problems, is liable to occur during film smoke volume skid phenomenon or wandering. Typical case: quality & ndash; — Samples: coffee small bags plating aluminum composite membrane ( Enterprises reflect the roll of film in bag making prone to run) 。 — — Targeted testing project: the coefficient of friction ( The inner and outer) And the coefficient of friction ( Lining and steel plate) And the coefficient of friction ( Outer layer and steel plate) 。 — — Results: sample the inner and outer friction coefficient is not uniform, the maximum static friction coefficient is 0. 213, minimum value is 0. A maximum of 167, the friction coefficient is 0. 152, minimum value is 0. 098; Lining and steel plate between the static friction coefficient of 0. 251, the friction coefficient was 0. 210; Outer layer between the plate and the static friction coefficient of 0. 196, the friction coefficient was 0. 173. Therefore, through the analysis of the three on the friction coefficient, the sample uneven coefficient of friction between the inside and outside layer may be caused the main reason for the samples of wandering. 2. Coffee packaging film of the barrier property of packaging material excellent blocking performance is to ensure that the coffee powder in shelf life tastes pure, don't produce the problem such as moisture absorption and agglomeration of one of the important prerequisite. If the environment or the inside of the packaging of oxygen, water vapor, nitrogen, carbon dioxide and other gases barrier property is poorer, permeability is better, on either side of the gas in the packaging of packaging poor internal protection of ground coffee. Typical case: quality & ndash; — Test sample: coffee powder aluminized composite membrane and finished product packaging ( According to the customer feedback information, the packing bags of coffee powder caking) 。 — — Specific inspection items: the amount of water vapor through the, knead after water vapor through capacity, sealing performance ( Negative pressure method) , heat sealing strength. — — Test result: the amount of water vapor through the sample is 0. 245g/( m2· 24h) High, the barrier property of water vapor; Amount of water vapor through the C mode after rubbing samples of 1. 061g/( m2· 24h) , still has high barrier property; Heat seal strength test, heat sealing side heat sealing strength is not uniform, different parts of the heat sealing effect is good heat sealing strength for 33. 075 n / 15 mm, heat sealing effect is poorer parts of the heat sealing strength of 11. 417 n / 15 mm, and the two hot sealing side is mixed with coffee powder; In - sealing performance test, the sample 70. 3 kpa under heat sealing side leakage. So the mixed powder hot sealing side leads to low heat sealing strength of packaging, sealing performance is poor, may be the important cause of coffee powder in agglomeration. Good coffee packaging film seems to be selling a small part of the coffee, but it has a significant impact on sales, will also affect the freshness of the coffee bean. Considering the above points will give you a confidence to make the right choice.