Plastic beverage bottles are mainly made of polyethylene or polypropylene and other materials and add a variety of organic solvents made of. Plastic bottles are widely used in polyester (PET), polyethylene (PE), polypropylene (PP) as raw materials, add the corresponding organic solvent, after high temperature heating, through plastic mold through blow molding, extrusion blowing, or injection molding Of plastic containers.
Mainly used for beverages, food, pickles, honey, dried fruit, edible oil, agricultural veterinary drugs such as liquid or solid disposable plastic packaging containers. Plastic bottles with not broken, low cost, high transparency, food grade raw materials and so on.
Plastic beverage bottles are made of polyester (PET), polyethylene (PE), polypropylene (PP) as raw materials, add the corresponding organic solvent, after high temperature heating, through plastic mold blow molding, extrusion blowing, or injection Shaped plastic containers. Plastic bottles with not broken, low cost, high transparency, food grade raw materials and so on.
When using plastic products, pay special attention to, do not touch vinegar, cleaning agents, etc., to avoid direct sunlight, high temperature, so as to avoid chemical reactions. In addition, when you buy plastic tableware, you should select the goods with PE (polyethylene) or PP (polypropylene) marked, decorative patterns, colorless and tasteless, smooth surface of plastic products.
There are many ways to make polyethylene, the most common of which is made in the high temperature of 200 ~ 300 ℃ and 1000 ~ 2000 atmospheric pressure, the ethylene polymerization made. In the polyethylene, not doped with other substances. The resulting polyethylene has a low density, a soft texture, and a high stability for sunlight, air, moisture and chemical reagents, so there is no need for external stabilizers, plasticizers, and stabilizers and plasticizers. Toxic or highly toxic.
Waste plastics: We all know that a large number of plastic products for food packaging there are three: polyvinyl chloride, polyethylene, polystyrene. Short period of time used to hold cooking oil, the human health is no hindrance. However, with them to long-term oil loaded, will pollute the food, causing harm to the human body.
This is because these bottles have a high transparency, easy to aging and other characteristics, in the air will be oxygen, ozone, the role of ultraviolet light to produce a strong smell, coupled with the aging of the polymer itself, if used for long-term storage of cooking oil, easy to make These foods are deteriorated.
In addition, the vinyl chloride element in the vinyl chloride is not only toxic, but also in acid and grease easily decomposed and precipitate toxic hydrogen chloride and chlorine, polyvinyl chloride added in the plasticizer, such as phthalates, Are toxic, as well as as a stabilizer of lead, cadmium and organic tin, are toxic chemicals, toxicity is large, and easy to dissolve in oil. Although the plastic polystyrene is a low toxicity substance, but its composition of styrene and volatile components of ethylbenzene, cumene are toxic, and very easy to dissolve in the oil. Plastic Polyethylene itself is not toxic. However, it is in contact with grease, can break down the precipitation of low molecular weight compounds, these low molecular elements dissolved in oil will produce toxicity. Plastic bottles easy to carry, not afraid to fall, with acid and alkali resistance, easy production, but also conducive to recycling.
(1) When designing extruded plastic bottles, if the material is made of high density polyethylene or polypropylene, the cross section of the plastic bottle shall be rectangular or oval. For materials with low density polyethylene or other flexible plastic bottles, The cross section is rounded as well. This facilitates the extrusion of the contents from the plastic bottle. Plastic parts used in conjunction with plastic bottles are mainly caps and sealers. The design of the plastic bottle should focus on how to make the plastic bottle can be better with the cover and seal with. The bottom of the plastic bottle is a weak part of the mechanical properties of plastic bottles. Therefore, the bottom of the plastic bottle is generally designed to concave; plastic bottle corner, and the concave, are doing a larger arc over. In order to facilitate the stacking of plastic bottles, increase the stability of the plastic bottle stacking, plastic bottles should be designed at the bottom of the groove.
(2) plastic bottle surface with labels, the standard surface should be flat. Can be designed in the plastic bottle surface of a "grid", so that accurate positioning of the label, does not produce mobile. In the blow molding, the first part of the parison blowing contact, always tend to first hardened parts. So the wall thickness of the site is also larger. Edge and corner parts, is the last part of the parison inflation contact, the site of the wall thickness is small. So the edge of the plastic bottle and the horn parts should be designed rounded. Change the surface shape of the plastic bottle, such as the middle of the plastic bottle is relatively thin, increase the surface of the plastic bottle groove or ribs, can improve the plastic bottle stiffness and bending resistance. Longitudinal grooves or ribs can eliminate the offset, sag or deformation of plastic bottles under long term loads.
(3) plastic bottle printing surface, is the most concentrated areas of consumer attention. If the plastic bottle contains handles, grooves, ribs and other structures, the design should be noted that the printing operation can not cause inconvenience. Oval plastic bottles, the stiffness is also higher, but the mold manufacturing costs higher. Therefore, in order to ensure the rigidity of plastic bottles, in addition to select the high rigidity of the material, but also through the plastic bottle shape design, enhance the plastic bottle stiffness and load resistance.
(4) As most of the plastic has a concave sensitivity, plastic bottles at the corners, the mouth of the root thread, neck and other parts, prone to cracks and cracking phenomenon, so these parts should be designed rounded. For the transfer of rectangular plastic bottles, the need to support most of the plastic bottle load, so the local increase in the wall thickness, but also help to improve the plastic bottle stiffness and load resistance.