Frequently Asked Questions about Plastic Bottle Preforms and Introduction to Production Materials.

(1) When designing squeeze plastic bottles, if the material is polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval. The cross-section A round shape is better for bottles made of low-density polyethylene or other flexible plastic bottles.

This makes it easier to squeeze the contents out of the plastic bottle. The plastic parts used with bottle mouths are mainly bottle caps and sealers. The design of the plastic bottle mouth should focus on how to make the plastic bottle mouth better cooperate with the cap and sealer. The bottom of the plastic bottle is the weakest part of the mechanical properties of the plastic bottle.

Therefore, the bottom of plastic bottles is generally designed to be concave; the corners and concavities of plastic bottles are made with larger arc transitions. To facilitate the stacking of plastic bottles and increase the stacking stability of plastic bottles, internal grooves should be designed at the bottom of plastic bottles.

(2) When using labels on the surface of plastic bottles, the label surface should be smooth. A "frame" can be designed on the surface of the plastic bottle to accurately position the label without movement. During blow molding, the part of the parison that is contacted by the blow molding always tends to harden. Therefore, the wall thickness in this part is also larger. The edges and corners are the parts where the parison is blown and contacted, and the wall thickness of this part is small.

Therefore, the edges and corners of plastic bottles should be designed with rounded corners. Changing the surface shape of the plastic bottle, such as making the middle part of the plastic bottle relatively thinner, and adding circumferential grooves or ribs on the surface of the plastic bottle, can improve the stiffness and bending resistance of the plastic bottle. Longitudinal grooves or reinforcements can eliminate the deflection, sagging, or deformation of plastic bottles under long-term load. Bottle cap series prices. (bottle preform wholesale)

(3) The printed surface of plastic bottles is where consumers focus their attention. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs, and other structures, care should be taken during design so as not to cause inconvenience to the printing operation. Oval plastic bottles have higher stiffness, but the manufacturing cost of the mold is higher. Therefore, to ensure the stiffness of plastic bottles, in addition to selecting materials with high stiffness, the stiffness and load-bearing strength of plastic bottles must also be enhanced through the shape design of the plastic bottles.

(4) Since plastics are notch sensitive, plastic bottles are prone to cracks and cracks at sharp corners, the roots of mouth threads, and necks, so these parts should be designed with rounded corners. The transfer point of the rectangular plastic bottle, needs to support of the load of the plastic bottle, so locally increasing the wall thickness will also help improve the stiffness and load-bearing strength of the plastic bottle.