1. Look at the shape: The formal manufacturer's packaging is generally professionally planned, with registered trademarks, factory name, contact telephone number, precautions and usage methods, etc., and marked with length or weight, the packaging is more delicate and generous. The defective aluminum foil sheeting paper does not have these elements.
2, look at the internal quality:
1 Look at the color: high-quality aluminum foil paper glossy as a mirror, not foggy but silver fresh. The appearance of the defective aluminum foil is dim.
2 See if it is changed or not: Open the seal and pull out 30cm or more to see if there is oxidative enthalpy change. After the oxidized aluminum foil is oxidized, white-green alumina will be formed. Because the outer surface of the outer ring can not be distinguished or changed.
3 look at the core: regular products will not do paper articles, but from the perspective of saving paper and transportation costs, the core paper tube diameter is generally between 3.5-4.5cm, the inner core wall thickness 1 Between -4mm, and the residual product inner core tube is made thick and large, the intention is to replace the weight of the aluminum foil with the weight of the paper tube.
4 See if it is sufficient: The number of laps from the aluminum foil paper can basically distinguish whether it is sufficient. If the visual inspection is not mastered, the weight of the inner core tube can be removed after the electronic weighing is used.
5 Look at the certificate: regular manufacturers have relevant parts of the test certificate and product quality certification, and the general three no products can not be supplied, the effective way to check the authenticity of the certificate is online inquiry.
