Plastic bottle production and problems, plastic bottle blowing machine,
The questions about plastic bottles are as follows: (1) When designing squeeze 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, low-density polyethylene or For other flexible plastic bottles, the cross section is preferably round. This makes it easy to squeeze out the contents from the plastic bottle. The plastic parts used in conjunction with the plastic bottle mouth are mainly bottle caps and sealers. The design of the plastic bottle mouth should be focused on; consider how to make the plastic bottle mouth better match the lid and sealer to the bottom of the plastic bottle, which is the weak part of the mechanical properties of the plastic bottle. Therefore, the bottom of the plastic bottle is generally designed to be concave; the corners and the concaves of the plastic bottle are all made with larger arcs. In order to facilitate the stacking of plastic bottles and increase the stacking stability of plastic bottles, the bottom of the plastic bottles should be designed with internal grooves. (2) When labels are used on the surface of plastic bottles, the labeling surface should be flat. A 'frame' can be designed on the surface of the plastic bottle, so that the label can be positioned accurately without movement. In blow molding, the part that the parison first contacts with inflation always tends to harden first. Therefore, the wall thickness of this part is also larger. The edge and corner part is the last contact part of the parison inflated, and the wall thickness of this part is small. Therefore, the edges and corners of the plastic bottle should be designed with rounded corners. Changing the surface shape of the plastic bottle, for example, the middle part of the plastic bottle is relatively thinner, and increasing the circumferential groove or rib on the surface of the plastic bottle can improve the rigidity and bending resistance of the plastic bottle. The longitudinal grooves or ribs can eliminate the deviation, sagging or deformation of the plastic bottle under long-term load. (3) The printing surface of the plastic bottle is the most concentrated part of consumers. The printing surface should be smooth and continuous; if the plastic bottle contains handles, grooves, ribs and other structures, the design should be careful not to cause inconvenience to the printing operation. Oval plastic bottles have higher rigidity, but the manufacturing cost of the mold is higher. Therefore, in order to ensure the rigidity of the plastic bottle, in addition to choosing a material with high rigidity, the shape of the plastic bottle must also be designed to enhance the rigidity and load resistance of the plastic bottle. Zhangjiagang Jinyi Machinery specializes in producing automatic blow molding machines, blow molding machines, PET blow molding machines, etc. Welcome to consult.
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