Plastic bottle packaging design needs attention to detail
Plastic bottle and cup packaging design needs attention to detailAlthough there are many kinds of plastics and they have a variety of different properties, it is necessary to meet the specific requirements of the products and to modify the plastics. This requires the addition of suitable additives to the resin. PET cups and bottle are also used as examples: The color masterbatch added is a kind of additive, called colorant. There are many types of additives, which can be roughly divided into: plasticizers, stabilizers, colorants, flame retardants, tougheners, antioxidants, foaming agents, and the like. The purpose of formula design is to choose suitable additives to improve the processing performance of the resin, internal performance and reduce costs. There are hundreds of auxiliaries that can be used in formula design, and there are hundreds of types of resins that can be blended. In order to select suitable ones, a needle in a haystack is not acceptable. Formula design must be based on certain principles.
When designing a plastic bottle and cup for extrusion, if the material is high-density polyethylene or polypropylene, the cross-section of the plastic bottle and cup should be rectangular or oval. For the material of low-density polyethylene or other flexible plastic bottle and cup, the cross-section Round is better. This facilitates the extrusion of the contents from the plastic bottle and cup. The plastic parts used with the plastic bottle and cup mouth are mainly bottle and cup caps and sealers. The design of the plastic bottle and cup mouth should focus on examination; how to make the plastic bottle and cup mouth fit the bottom of the plastic bottle and cup with the lid and the sealer better is the weak part of the mechanical performance of the plastic bottle and cup. Therefore, the bottom of the plastic bottle and cup is generally designed to be concave; the corners of the plastic bottle and cup, as well as the inner cavity, are all subject to large arc oversizing.In order to facilitate the stacking of plastic bottle and cups and increase the stacking stability of plastic bottle and cups, the bottom of plastic bottle and cups should be designed with inner grooves.
Since most plastics have notch sensitivity, plastic bottle and cups are susceptible to cracking and cracking at sharp corners, the roots of the mouth thread, and the neck, so these parts should be rounded. When the surface of the plastic bottle and cup is labeled, the surface of the label should be flat. A "sash" can be designed on the surface of the plastic bottle and cup so that the tag can be accurately positioned without movement. 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 cup and the corner should be rounded.