The most common shapes for Pet Bottle Preform are round, square, oval, and the like. From the point of view of use, they each have their own advantages and disadvantages. Round pet bottles have a high stiffness but are not aesthetically pleasing. The square pet bottle has a beautiful appearance, but it is not easy to control the uniform thickness of the pet bottle during molding. The oval pet bottle has a higher rigidity, but the manufacturing cost of the mold is higher. Therefore, in order to ensure the rigidity of the pet bottle, in addition to selecting the material with high rigidity, the shape of the pet bottle is planned to enhance the rigidity and load resistance of the pet bottle.
Change the shape of the pet bottle, such as the middle of the pet bottle is relatively thin, add the circumferential groove or convex rib of the appearance of the pet bottle, can improve the rigidity and tortuosity of the pet bottle. Longitudinal grooves or ribs eliminate the offset, sagging or deformation of the pet bottle under long-term load. When planning a kneading pet bottle, if the raw material is high-density polyethylene or polypropylene, the cross section of the pet bottle should be rectangular or elliptical. The raw material is low-density polyethylene or other flexible pet bottle, and its cross section is round. Shaped as good.
This facilitates the extrusion of the contents from the pet bottle. In order to make the pet bottle wall thickness uniform, it should be noted that the shape of the pet bottle should be symmetrical. Minimize the pole stretching points and parts. Arc transitions are used at all transitions. The printed surface of the pet bottle is the most concentrated part of the consumer’s attention. The printed appearance should be flat and continuous; if the pet bottle contains handles, grooves, ribs, etc., it should be noted that it is not convenient to form the printing operation. When the label of the pet bottle is selected, the surface of the label should be flat.
A “sash” can be planned on the outside of the pet bottle to make the label accurately positioned without movement. At the time of blow molding, the portion where the parison is first inflated tends to be hardened first. Therefore, the wall thickness of the portion is also larger. The margin and the corner portion are the portions of the parison that are inflated and finally touched, and the wall thickness of the portion is small.
Therefore, the margin and the corner of the pet bottle should be planned to be rounded. Since most pets have notch sensitivity, the pet bottle is prone to cracks and cracks at the sharp corners, the roots of the mouth threads, the neck, etc., so these parts should be planned to be rounded.
Jilian mold has a variety of Pet Bottle Mould, and we can also design professional products for you according to your own needs. If you have such needs, please don’t hesitate to contact us. Let’s go.