ABS Blow Molding
ABS blow molding material has strong mechanical properties, high strength and hardness, and can withstand large external forces and pressures, making it very suitable for manufacturing components in the automotive industry that need to withstand certain loads.
Blow Mold Solutions | Forming Production Process
The blow mold solutions are guaranteed services proposed by manufacturers for different customers and products, which can bring more precise and consistent products. The solution for blow molding molds should combine precision with innovation to deliver products that meet customer satisfaction, are technologically advanced, and have outstanding quality. Throughout, the manufacturer’s professional team has been able to flexibly respond to every constantly changing demand, meet or exceed customer expectations, and provide reliable and stable first-class services. Whether it’s manufacturing plastic blow molding molds or providing blow molding or injection molding services, it can meet the expectations of every company.
Problems with Blow Molded Products in Different Fields
The solutions for blow mold vary depending on the product, so it is essential to have an understanding of the products manufactured by the blow mold to propose targeted solutions and provide services. Blow molding is a key technology for producing high-quality and highly competitive products. The products produced have relatively high performance, such as good impact resistance and environmental adaptability. Both HDPE and ABS blow molding can produce products with thin walls, diverse colors, and complex shapes without the need for later assembly.
Daily Necessities: Blow-molded products are widely used in plastic bottles, shampoo and shower gel bottles, cosmetics bottles, and trash cans due to their lightweight production. Their easy-to-carry, bright colors and convenient durability have attracted the attention of consumers. The products in this field mainly suffer from uneven color and uneven thickness.
Medical Field: Due to the non-toxic, harmless, and corrosion-resistant characteristics of the raw materials used in blow molding, they are well used in medicine bottles, infusion bottles, syringes, and oral liquid bottles to protect the quality of medicine bottles. Products in this field mainly encounter issues of precision and safety.
Chemical Industry: Due to the lightweight and chemical resistance of blow-molded products, they are widely used in the production of various chemical containers and can effectively store acidic or alkaline substances. Blow-molded products can also be used in the production of paint buckets and fertilizer buckets. This product should pay attention to the issue of chemical resistance.
Food Field: Blow molding can produce products with seamless, smooth, and transparent bottoms, and good airtightness. It is used in beverage bottles, soy sauce bottles, oil kettles, wine bottles, etc., effectively ensuring the quality of food. This type of product should focus on the issue of airtightness.
Agriculture: The application of blow-molded products in agriculture is mainly in packaging, such as pesticide packaging, fertilizer packaging, etc. They have a long service life and can adapt well to climate change.
Personal protection field: The application of blow molding in the field of personal protection mainly involves blowing safety helmets, gloves, earplugs, and other products. Products in this field should pay attention to whether they have good toughness and impact resistance.
Other fields: such as making children’s toys; Pipelines, fuel tanks, etc. in the automotive industry; Office supplies folder, etc.
Design Points of Blow Molding Molds
To propose reliable solutions for blow mold and perform proper maintenance, manufacturers need to understand the design points of blow molding molds and propose corresponding solutions for each component of the blow mold.
Design of Mold Parting Surface: The position of the parting surface of the blow molding mold should be selected to make the mold symmetrical, and it should be set at the step as much as possible according to the shape of the blow molding product cavity to avoid parting marks that may affect the appearance of the product. Especially for irregularly shaped products with complex shapes, determining the position of the parting surface is crucial. If the position of the parting surface is not determined properly, it is highly likely to cause difficulty in demolding or scratching the product components. The design of the parting surface should also be as simple as possible and convenient for processing. Generally, only one parting surface perpendicular to the mold opening direction is used.
The Design of the Mold Cavity: The shape and appearance of blow-molded products are generally directly determined by the mold cavity. To prevent the occurrence of bubbles due to poor exhaust in the mold cavity, the surface of the mold cavity is made by blow molding with polyethylene (PE) as the raw material is a bit rough and not smooth. Sandblasting the cavity to form a rough surface can effectively prevent the disadvantages of uneven mold cooling and uneven shrinkage rate. The design of the mold cavity also needs to consider the shape, accuracy requirements, and shrinkage rate of the product.
Design of Mold Clamping Mouth: The sharp position of the blow molding mold mouth becomes the clamping mouth of the mold, also known as the cut, which generally Includes Two Types: integral and insert. The integral cut is generally suitable for various situations, including high-precision workpieces and simple-shaped workpieces; However, insert-type incisions are generally only suitable for large or complex-shaped molds, which can reduce processing difficulty. The design of the clamping mouth needs to be moderate. If it is too small, it will reduce the connection strength of the container, and if it is too large, it will not be able to cut the plastic part. To prevent damage to the incision, it is generally necessary to embed it with metal materials during design to prevent excessive wear.
Design of Mold Exhaust and Cooling System: The exhaust and cooling systems of the mold are complementary. If the exhaust system fails, the cooling system cannot operate normally, especially for blow molding molds, which require much more work than injection molding molds. The compression of air inside the blow molding mold is relatively small, so if the gas cannot be discharged promptly during the working process, it will cause the plastic part to not be completely blown and tightly adhere to the mold wall, resulting in defects and rough surface of the plastic part; Moreover, poor exhaust can prolong the cooling time and slow down the production process.
Design of Mold Inserts: The inserts of blow molding molds have a certain impact on the performance and shape of the finished product, so the inserts need to have good rigidity, hardness, and impact resistance during design, and should not be too sensitive to the reaction of friction. When selecting materials for making inserts, their thermal conductivity should also be considered. The plastic around the insert should be kept as thick as possible to prevent cracking.
The Problems and Solutions in the Production of Blow Molding Molds
There are various and targeted solutions to the problems that arise during the use of blow mold, such as:
When the wall thickness of the products produced during blow molding is uneven, especially for products with complex and irregular shapes, it is advisable to consider replacing the molding equipment. For example, choosing a molding machine with higher automation can avoid position errors and temperature changes caused by manual feeding; It is also possible to consider changing the structure of the product and mold. In areas where the thickness is too thin, reinforcement ribs can be embedded, but the final product must match the provided sample; Similarly, it is also possible to consider changing the molding process, such as changing the temperature, pressure, and speed of injection blow molding. In areas where the mold temperature is too high, pressure is too high, and screw speed is too fast, it is easy to be blown out, resulting in thinning of these products.
When encountering difficulties in demolding during the blow molding process, the first step is to understand how the finished product is demolded, such as manual demolding, pneumatic demolding, or mechanical demolding. If the cooling time of the product is too long, it will cause the cooling temperature to be too low and make it difficult to de-mold. In this case, the blowing and swelling time should be shortened; Release agents can also be used to adjust the locking device or reinstall the mold.
If there is a problem with the unsmooth opening and closing of the mold during the blow molding process, it is necessary to consider whether it is due to unreasonable opening and closing pressure settings, abnormal starting voltage, or incorrect installation. At this point, the voltage and installation of the mold can be checked first, and the mold opening pressure can be adjusted to the maximum value. The mold can be closed manually before opening to adjust the most suitable pressure and restore the normal opening and closing of the mold.
If there is a blockage problem during the blow molding process, it is necessary to check and distinguish whether it is in the mold, the injection port, or the exhaust hole. If there is a blockage in the mold, the mold should be opened first, and then foreign objects should be checked and cleaned; If the injection port is blocked, check if there is any residue in the pipeline. If there is, it should be removed promptly. If not, consider whether there is a problem with the injection time and pressure setting; If there is blockage in the exhaust hole, it is necessary to consider whether the plastic’s melting temperature is too high or the molding pressure is too high, which causes the flow to be too fast. At this time, the exhaust hole should be thoroughly cleaned and the molding temperature and pressure should be reduced.
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