When designing squeeze plastic bottles, if the material […]
When designing squeeze plastic bottles, if the material is high density polyethylene or polypropylene, the cross section of the plastic bottle should be rectangular or oval. For low density polyethylene or other flexible plastic bottles, the horizontal cross section is preferably round. This facilitates the extrusion of the contents from the plastic bottle. The plastic parts used with plastic bottle mouths are mainly bottle caps and seals. The design of the plastic bottle mouth should focus on how to make the plastic bottle mouth better fit the lid and the sealing machine. The bottom of the plastic bottle is the weak part of the mechanical properties of the plastic bottle. Therefore, the bottom of a plastic bottle is usually designed to be concave. The corners of the plastic bottle and the recessed part are excessively bent. In order to facilitate the stacking of plastic bottles, the stacking stability of plastic bottles is increased, and the bottom of the plastic bottles should be designed with an internal groove.
When marking the surface of a plastic bottle, the surface of the label should be flat. A "frame" can be designed on the surface of the plastic bottle so that the label can be accurately positioned without moving. When blow molding, the first part of the parison always always hardens first. Therefore, the wall thickness of this portion is also large. The edge and corner portions are the portions where the parison swelled for the last contact, and the wall thickness of this portion was small. Therefore, the edges and corners of plastic bottles should be designed to be round. Changing the surface shape of the plastic bottle, for example, the middle part of the plastic bottle is relatively thin, and increasing the circumferential grooves or ribs on the surface of the plastic bottle can improve the rigidity and bending resistance of the plastic bottle. Longitudinal grooves or ribs eliminate offset, slack or deformation of plastic bottles under long-term loads.
The printed surface of plastic bottles is the most focused part of consumers. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs, and other structures, care should be taken not to cause inconvenience to the printing operation. The oval plastic bottle has higher rigidity, but the manufacturing cost of the mold is higher. Therefore, in order to ensure the rigidity of the plastic bottle, in addition to selecting a material having high rigidity, the shape of the plastic bottle is also designed to enhance the rigidity and load resistance of the plastic bottle.
Since most plastics are notch-sensitive, plastic bottles are prone to cracking and cracking at sharp corners, thread roots, necks, etc. These parts should be designed to be round. For the transfer of rectangular plastic bottles, most of the load of the plastic bottles must be supported, so locally increasing the wall thickness at this position is also beneficial to increase the rigidity and load resistance of the plastic bottles.
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