The processing technology of plastic bottle is quite strict actually, the formal manufacturer actually has its own strict processing operation method, there are many problems to pay attention to in plastic bottle processing.
First, in the design of extrusion plastic, if is made of high density polyethylene or polypropylene, plastic bottles of cross section should be rectangular or oval, for material for low density polyethylene or other flexible material, the round cross section as well, because facilitate contents from plastic bottles inside out. Used with plastic bottle of the plastic parts mainly for the bottle cap and sealing device, the design of the feeding bottle should consider mainly, make plastic bottle can better cooperate with cover and sealing device, the bottom of the plastic bottles are weak parts of the mechanical properties of plastic water bottles. Therefore, the bottom of the plastic bottle is generally designed to be concave. The corner of plastic bottle and inside concave place, do bigger arc excessive. In order to facilitate the stacking of plastic bottles and increase the stacking stability of plastic bottles, the bottom of plastic bottles should be designed with internal grooves.
Second, when labeling is used on the surface of plastic bottles, the labeling surface should be as smooth as possible. A "frame" can be designed on the surface of the plastic bottle so that the label can be accurately positioned without moving. In blow molding, the first contact of the billet blown expansion, always tends to the first hardening of the position. So the wall is thicker. The edge and the corner are the final contact parts of the billet, and the wall thickness is small. So the edges and corners of plastic bottles should be rounded. Change the surface shape of the plastic bottle, such as the center of the plastic bottle is relatively small, increase the surface of the plastic bottle around grooves or convex bars, can improve the rigidity and bending resistance of the plastic bottle. Vertical grooves or reinforcing bars can eliminate the deflection, sagging or deformation of plastic bottles under long-term load.
Third, the printing surface of plastic bottles is the most focused part of consumers' attention. The printing surface shall be smooth and continuous; If the plastic bottle contains handle, groove, reinforcing bar and other structures, the design should be careful not to cause inconvenience to the printing operation. Oval plastic bottles, high stiffness, higher mold manufacturing costs. Therefore, in order to ensure the rigidity of plastic bottles, besides choosing materials with high rigidity, the rigidity and load resistance of plastic bottles should be enhanced through the appearance design of plastic bottles.
Fourth, 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. For the transfer of rectangular plastic bottles, most of the load of plastic bottles needs to be supported, so the local increase of the wall thickness of the rectangular plastic bottles, as well as the stiffness and load resistance of the plastic bottles.
The processing and packaging of plastic bottles must pay attention to the above problems.
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