The causes for the leakage of flexible packaging products
Leakage of packaging products generally have two kinds: one kind is the result of the design and the reason of the structure, both of them are nevitably, which could change the design and structure of the packaging products to solve the problems; Another kind is due to the packaging products produced in the process of manufacturing, transportation and caused by the leakage under the condition of without changing the structure and design, which could be solved by adjusting. Determine whether there is a leak in a packaging products, and the position of leakage, which is more important for packaging engineering.
From the point of testing methods, packaging products leakage in general is given priority to with qualitative, the testing purpose is mostly packaging products in the production of packaging materials, packaging products molding, filling, heat sealing, sterilization, and in the process of storage, transportation, sales whether there is some defects caused by the leakage of the products.
Caused by the defect of product leakage generally has two kinds: wear and seal leakage.Wear refers to the packaging materials from external extrusion pressure and forming a through hole or crack, its reason in general are:
1, heat sealing pressure is too big. In the process of heat sealing, if heat sealing pressure or heat sealing mould not parallel, local pressure is too large, which will wear some fragile packaging materials.
2, heat sealing die rough, angular, or foreign bodies. When make heat sealing with poor packaging materials, new mould will crushed some heat sealing mould after bruised produce sharp edges usually, and easy to wear packaging materials.
3, wrong choice for the thickness of the packing material . Some packaging machinery for the thickness of the packaging material have an requirements, if the thickness is too big, the certain position of the packet may wear. Such as pillow packaging machine, the thickness of packaging materials in general should not be greater than 60 mu M, if the packing material is too thick, the pillow type packing in the sealing parts are easily broken.
4, Correct choice for packaging materials in the right structure. Some packaging materials’ compressive wear performance is poor, which cannot be used for packing something that harder angular, such as paper aluminum-plastic composite materials used for packing grain granule, it is easy to cause pressure to wear.
5, mold design, improper packaging. In the design process, jorge sealing membrane of die hole is inconsistent with the shape and size of the packaging and the packaging material mechanical strength and different, in the packaging process is easy to wear or fracturing packaging materials as well.
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