Special requirements for blow molding mold manufacturers on hollow blow molding products

Author: MULAN - Plastic Molding Manufacturer

Blow molding manufacturers always have a lot of experience to talk about, and the experts are the ones who know the way. We mentioned blow molding, which mainly shapes hollow plastic products, which have a wide range of uses. Most of the plastic products such as bottles, cans, tanks and toys in daily life are made by blow molding. At present, it has developed into large, complex, multi-layer and other types. Of course, there are many small and medium-sized blow molding products, and large water heater shells can also be produced. In recent years, the blow molding process has developed greatly. Blow mold manufacturers continue to innovate technology and can form structural parts of automobiles, household appliances, office machines, etc., mainly some large and thick-walled parts, such as automotive fuel tanks, Seat armrests, etc., or double-wall blow molding parts such as portable suitcases, automotive pipes and other parts with relatively low precision requirements. Generally, hollow products are required to be very thin in order to increase productivity and reduce costs. How to have enough strength and rigidity without increasing the thickness, so the shape of the product should add more concave and convex ribs, sharp corners are not allowed at the corners, and the bottom is designed to be concave. In order to keep the container sealed, the bottle mouth is designed with threads. Generally, it is better to use trapezoidal or semicircular thread, which is more convenient for forming. According to the requirements of the use, the thread can be designed as continuous, intermittent or multi-headed, etc. Blow molding mold manufacturers recommend which kind of plastic to choose from the physical and chemical properties of the plastic (such as transparency, strength, rigid density, heat resistance, corrosion resistance, edibility, etc.), shrinkage rate and other aspects. Thermoplastics are generally available, among which polyethylene is the most widely used, while polyvinyl chloride with high transparency is widely used in food containers, and high-density polyethylene is widely used in heat-resistant and impact-resistant occasions. The shrinkage rate of various materials is different, and it needs to be considered in the bottle thread that requires high precision or the product that requires accurate capacity. For example, conventional shrinkage parameters: polyethylene (low density) 1.2~2; polystyrene and modified 0.5~0.8; polyethylene (high density) 1.5~3.5; polypropylene 1 .2-2 nylon-60.5-2; polycarbonate 0.5-0.8; polyvinyl chloride 0.6-0.8. Due to different processing methods, the selected plastics are also different. Different plastics have different stretch ratios, different inflation ratios, different strengths, and different transparency. Have you got the experience of blow molding mold manufacturers? The pictures and texts are for learning reference only. For more professional information, please pay attention to Proficiency Proficient in Mold | Blow Mold Manufacturer |Since 1998, trustworthy.