Questions About Plastic Bottles

(1) In the design of extruded plastic bottles, if the material is high density polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval, for the material is low density polyethylene or other flexible plastic bottles, the cross-section of the cross-section to be round. This facilitates the extrusion of the contents from the plastic bottle. The plastic parts used in conjunction with plastic bottle mouths are mainly caps and sealers. The design of plastic bottle slings should focus on how to make the plastic bottle mouth better with the lid and sealer. The bottom of the plastic bottle is a weak part of the mechanical properties of the plastic bottle. Therefore, the bottom of the plastic bottle is generally designed as an inner concave shape, the corner of the plastic bottle, and the inner recess, are larger arc over.

In order to facilitate the stacking of plastic bottles, increase the stacking code stability of plastic bottles, the bottom of the plastic bottle should be designed with grooves.

(2) When the surface of the plastic bottle is labeled, the surface should be flat. A "frame" can be designed on the surface of the plastic bottle so that the label is accurately positioned without moving. In the blow molding, the first contact of the part of the type of billet, always tend to harden the site first. So the wall thickness of the department is also larger. The edge and corner part, is the last contact of the type billet blowing, the wall thickness of the part of the bit is small. Therefore, the edges and corners of plastic bottles should be designed into rounded corners. Changing the surface shape of a plastic bottle, such as the middle of a plastic bottle relatively thin, increases the perimeter groove slot or bulge on the surface of the plastic bottle, which can improve the stiffness and bendability of the plastic bottle.

Vertical grooves or reinforcing ribs eliminate the offset, sagging or deformation of plastic bottles under long-term loads.

(3) The printing surface of the plastic bottle is the most focused part of the consumer's attention. The printed surface should be flat and continuous, and if the plastic bottle contains handle, groove, reinforced ribs and other structures, the design should be careful not to cause inconvenience to the printing operation. Oval plastic bottles, stiffness is also higher, but mold manufacturing costs are higher.

Therefore, in order to ensure the stiffness of plastic bottles, in addition to the choice of high stiffness materials, but also through the shape of plastic bottles design, enhance the stiffness of plastic bottles and load strength.

(4) Because most plastics have notch sensitivity, plastic bottles in the sharp corner, the root of the mouth thread, neck and other parts, easy to produce cracks and cracking phenomenon, so these parts should be designed into rounded corners. For the transfer of rectangular plastic bottles, it is necessary to support most of the load of the plastic bottle, so locally increase the wall thickness of the place, but also conducive to improve the stiffness of the plastic bottle and load strength.