What are the matters needing attention in the processing of plastic cosmetics?

Now many cosmetic bottles are made of PET plastic material, which is mainly convenient to carry, more resistant to fall, and more practical. The processing technology of plastic bottles is also quite strict. In fact, regular manufacturers have their own strict processing and operation methods. In order to improve the quality of plastic bottles, there are some matters needing attention in the processing process.　

   1. When designing extruded plastics, if the material is high-density polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval. For low-density polyethylene or other flexible materials, the cross-section should be The round shape is better because it is convenient for the contents to be squeezed out of the plastic bottle. The plastic parts used in conjunction with the plastic bottle mouth are mainly bottle caps and sealers. The design of the material bottle mouth should be considered so that the plastic bottle mouth can better match the cap and sealer. The bottom of the plastic bottle is the mechanical properties of the plastic bottle. The weak part.　



　2. When using labels on the surface of the plastic bottle, try to make the label surface as flat as possible. 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 first part of the parison that is blown into contact always tends to harden first. Therefore, the wall thickness of this part is also larger.　

　3. The printing surface of the plastic bottle is the place where consumers pay the most attention. 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 and higher mold manufacturing costs. Therefore, in order to ensure the rigidity of the plastic bottle, in addition to selecting a material with high rigidity, the shape of the plastic bottle must be designed to enhance the rigidity and load resistance of the plastic bottle.　

　4. Since most plastics have notch sensitivity, plastic bottles are prone to cracks and cracks at sharp corners, the root of the mouth thread, the neck and other parts, so these parts should be designed with rounded corners. For the transfer place of the rectangular plastic bottle, it is necessary to support most of the load of the plastic bottle, so locally increasing the wall thickness at this place is also beneficial to improve the rigidity and load resistance of the plastic bottle.

　　 The above are some matters needing attention during the processing of plastic cosmetic bottles. Although many people think that the glass material of cosmetic bottles is better, the craftsmanship of plastic bottles is also very good, especially the portable sample bottles. Both the design and the capacity are very reasonable.