What problems should be paid attention to in plastic bottle labelling
(1) when designing extrusion type 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. This allows the content to be squeezed out of the plastic bottle. The plastic parts used in conjunction with plastic bottles are mainly bottle caps and seals. The design of plastic bottle mouth should be focused on; It is a weak part of the mechanical properties of plastic bottle to consider how to make plastic bottle mouth better with lid and seal with the bottom of plastic bottle. Therefore, the bottom of the plastic bottle is generally designed as a concave shape; The corner of plastic bottle, and inside concave place, all do bigger circular arc excessive. To facilitate the stack of plastic bottles, increase the stability of plastic bottles, the bottom of the plastic bottle should be designed in the groove.
(2) when the plastic bottle surface adopts the label, the label should be smooth. A "frame" can be designed on the surface of the plastic bottle to accurately locate the label and not generate movement. In blow molding, the first contact part of the billet bulking, always tends to harden. So the wall is a little thicker. The edges and corners are the last contact parts of the billet, and the wall thickness is smaller. Therefore, the edge of plastic bottle and the Angle should be designed into rounded corners. Change the surface shape of the plastic bottle, such as the middle of the plastic bottle, to increase the surface of the plastic bottle to the groove or the convex rib, which can improve the rigidity and bending of the plastic bottle. Longitudinal grooves or reinforcing bars can remove the drift, drooping or deformation of plastic bottles under long-term loads.
(3) the printed surface of the plastic bottle is the most concentrated part of the consumer's attention. The printing surface shall be flat and continuous; If the plastic bottle contains handles, grooves and reinforcement bars, the design should be careful not to cause inconvenience to the printing operation. Oval plastic bottle, the stiffness is also higher, but the manufacturing cost of the mold is higher. Therefore, in order to guarantee the stiffness of plastic bottle, in addition to the materials with high stiffness, the plastic bottle should be designed to enhance the stiffness and load resistance of plastic bottles.
(4) since most plastic has the 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. For the transfer of rectangular plastic bottle, most of the load of plastic bottle needs to be supported, so the wall thickness of the part should be increased locally, and the stiffness and load resistance of the plastic bottle can be improved.
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