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Plastic Bottle Technology Introduction
Jun 23, 2018

Plastic bottle processing technology is actually quite strict, formal manufacturers actually have their own strict processing methods, there are many issues in the plastic bottle processing should pay attention.

First, in the design of extruded plastics, if the material is high-density polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or elliptical. When the material is low-density polyethylene or other flexible material, its cross-section A round shape is preferable because it facilitates the extrusion of the contents from the plastic bottle. The plastic parts used in conjunction with plastic bottles and mouths are mainly bottle caps and sealers. The design of the bottle mouth should be considered with emphasis, so that the plastic bottle mouth can be better matched with the cap and sealer. The bottom of the plastic bottle is the mechanical properties of the plastic bottle. Weak parts. Therefore, the bottom of the plastic bottle is generally designed to be concave. Plastic circular corners and recesses are made with large arc overs. 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 inner grooves.

Second, when the surface of the plastic bottle is labeled, try to make the surface of the label flat. A "sash" can be designed on the surface of the plastic bottle so that the tag can be accurately positioned without movement. During blow molding, the place where the parison inflates first contacts always tends to harden in advance. Therefore, the wall thickness of this part is also larger. The edges and corners are the parts where the parison is inflated last, and the wall thickness is smaller. Therefore, the edge of the plastic bottle and the corner should be rounded. Changing the surface shape of the plastic bottle, such as a relatively small central portion of the plastic bottle, increases the circumferential groove or rib on the surface of the plastic bottle, which can improve the rigidity and bending resistance of the plastic bottle. Longitudinal grooves or ribs eliminate plastic bottle deflection, sagging or deformation under long-term loading.

 Third, the printed surface of plastic bottles is the most concentrated part of consumers' attention. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs, etc., the design should be careful not to cause inconvenience to the printing operation. Oval-shaped plastic bottles have higher rigidity and higher manufacturing costs for molds. Therefore, in order to ensure the rigidity of the plastic bottle, besides selecting a material with high rigidity, the shape of the plastic bottle must be designed to enhance the rigidity and load bearing strength of the plastic bottle.

 Fourth, since most plastics have notch sensitivities, plastic bottles are susceptible to cracks and cracks at sharp corners, the roots of the mouth thread, and the neck, and these parts should be rounded. For the transfer of rectangular plastic bottles, most of the load of the plastic bottles needs to be supported. Therefore, the wall thickness at that part is locally increased, which is also advantageous for improving the rigidity and load-bearing strength of the plastic bottles.