A common problem of plastic bottles

Plastic bottles, the cost is low, not easy broken, good transparency, food grade raw material and some other characteristics, widely used. Is the cosmetics, food and beverage industry common packaging container. What is the common problem, then, plastic, with flying over the small make up take a look at: 1, in the design of extrusion plastic bottles, if is made of high density polyethylene or polypropylene, plastic bottles of cross section should be rectangular or oval, low density polyethylene or other flexible material for plastic bottle, its round cross section as well. Such facilitating contents from out from the plastic bottles. Used with plastic bottle of the plastic parts mainly for cap and seal. The design of plastic bottle should focus on; About how to make the plastic bottle can better cooperate with cover and seal the bottom of the plastic bottles, plastic bottles is weak parts of the mechanical properties. Therefore, the plastic bottle at the bottom of the general design into inner concave; Plastic bottles of the corner, and inner sunken place, all do larger arc excessive. For convenience of plastic bottles stacked, increasing the stacking stability of plastic bottles, plastic bottles should be designed at the bottom of the groove. 2, the surfaces of the plastic bottle labeling, so that the cover is flat and level. In the surface of the plastic bottle design a 'box', make the labeling accurate positioning, do not produce movement. In blow molding, the parison swell touching part first, always tends to hardening of the first part. So the parts of the wall thickness is bigger. Edge and corner area, is the parison swell the touching part, the part of the wall thickness is smaller. So the edges of the plastic bottles and wipe Angle parts should be designed as a rounded corners. Change the shape of the surface of the plastic bottle, such as plastic bottle in the middle of relatively thin some, increase the surface of the plastic bottles of circumferential grooves or convex rib, can improve the rigidity and the bending resistance of plastic bottles. Longitudinal grooves or reinforcement, can eliminate plastic bottles under long-term load migration, sagging or deformation phenomenon. 3, plastic printing surface, are the most important parts of the consumers' attention. Printing surface should be smooth and continuous; If plastic bottles containing handle, grooves, the reinforced structure, such as design should pay attention to when printing operation inconvenience. Oval plastic bottles, rigidity is high, but the mould manufacturing cost is higher. So to ensure the stiffness of plastic bottles, in addition to choose the material with high rigidity, but also by the shape of the plastic bottle design, enhancing stiffness and load resistance strength of plastic bottles. 4, since most plastic with notch sensitivity, plastic bottles at the sharp corners, mouth thread roots, in areas such as the neck, prone to fracture and cracking phenomenon, so these parts should be designed with rounded corners. Support needed for the corner of rectangular plastic, plastic bottles, most of the load of the wall thickness, so local increase here also to increase stiffness and load resistance strength of plastic bottles.