Food Grade Plastic Bottle labeling process need to pay attention to the problem
(1) In the design of extruded Food Grade Plastic Bottles, if the material is high density polyethylene or polypropylene, Food Grade Plastic Bottle cross-section should be rectangular or oval, for the material for low-density polyethylene or other flexible Food Grade Plastic Bottles, the cross-section to round as well. This facilitates the extrusion of the contents from a Food Grade Plastic Bottle. Plastic parts used in conjunction with Food Grade Plastic Bottles are mainly caps and sealers. Food Grade Plastic Bottle design should focus on the test; how to make Food Grade Plastic Bottle can be better with the lid and seal with the bottom of the Food Grade Plastic Bottle, Food Grade Plastic Bottle mechanical properties of the weak parts. Therefore, the bottom of the Food Grade Plastic Bottles are generally designed to be concave; Food Grade Plastic Bottles at the corner, and the concave, are doing a larger arc over. In order to facilitate the stacking of Food Grade Plastic Bottles, increase the stability of Food Grade Plastic Bottles, the bottom of the Food Grade Plastic Bottles should be designed inside the groove.
(2) Food Grade Plastic Bottle surface with labels, the standard surface should be flat. Can be in the Food Grade Plastic Bottle surface design of a "box", 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 Food Grade Plastic Bottle and the horns should be designed rounded. Change the surface shape of Food Grade Plastic Bottles, such as Food Grade Plastic Bottles in the middle of relatively thin, increase the Food Grade Plastic Bottles on the surface of the circumferential groove or ribs, can improve the Food Grade Plastic Bottle stiffness and bending resistance. Longitudinal grooves or ribs can eliminate the migration, sagging or deformation of Food Grade Plastic Bottle under long term loads.
(3) Food Grade Plastic Bottle of the printing surface, is the most concentrated areas of consumer attention. Printed surface should be flat, continuous; if the Food Grade Plastic Bottles contain handles, grooves, ribs and other structures, the design should pay attention to the printing operation can not cause inconvenience. Oval-shaped Food Grade Plastic Bottles, the stiffness is also higher, but the mold manufacturing costs higher. Therefore, in order to ensure the rigidity of Food Grade Plastic Bottles, in addition to the choice of high rigidity of the material, but also through the Food Grade Plastic Bottle shape design, enhance the Food Grade Plastic Bottle stiffness and load resistance.
(4) As most of the plastic has a concave sensitivity, Food Grade 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 Food Grade Plastic Bottles, it is necessary to support most of the load of Food Grade Plastic Bottles, so the local increase in the wall thickness, but also help to improve the Food Grade Plastic Bottle stiffness and load resistance.
But at the same time, Food Grade Plastic Bottle also appeared some insecurity. - some health food production enterprises for their own products, packaging emphasizes low-cost, so - some small and medium-sized packaging enterprises to meet this demand, the use of non-standard industrial materials, rather than the required requirements of food grade materials. With non-standard materials made of packaging appearance and the use of food-grade materials made of packaging is not much difference, the harm to human health can not see a short time. However, over time, the hazards of industrial materials will be exposed.
Food Grade Plastic Bottles have a lot of convenience, but there are also some problems. The problems faced by polymer materials mainly in environmental protection, one is pollution, the second is difficult to recover. From a security point of view, packaging materials must be environmentally friendly. Degradation materials can be used, the use of photodegradation for processing. Although the current common PVC materials are not included in the environmental level, but the international is not to limit it, to meet environmental requirements, available post-processing approach to be resolved. Post-processing that is the raw material for burning, the temperature reached 1400 ℃ can greatly reduce its harmful substances, reduce pollution.