What is the Blow Molding Process? What is the difference between blow molding and blow molding proce

Blow molding, also known as hollow blow molding, is a method of blowing a hot melt parison closed in a mold to form a hollow product with the help of gas pressure.

Blow molding process in World War II.

During this period, it began to be used for the production of low-density polyethylene.

Vial. In the late 50s, with high-density polyethylene.

With the birth of blow molding machines and the development of blow molding machines, blow molding technology has been widely used.

Hollow containers can be produced in volumes of several thousand liters, and some are already computer-controlled. The raw materials suitable for blow molding are polyethylene, polyvinyl chloride and polypropylene.

polyester, etc. According to the parison manufacturing method, blow molding can be divided into extrusion blow molding and injection blow molding, and the newly developed multi-layer blow molding and stretch blow molding.

Raw materials required for blow molding:

Raw materials for hollow blow molding: polypropylene, polyvinyl chloride, polyethylene, polystyrene.

Linear polyester, polycarbonate.

Polyamides, cellulose acetate and polyacetal resins, etc.

In the medium term, high-density polyethylene (HDPE) is the largest consumer and is widely used in the packaging of food, chemical and processing liquids, and high molecular weight polyethylene is suitable for the manufacture of large fuel tanks and drums.

Because of its good transparency and air tightness, polyvinyl chloride is widely used in the packaging of cosmetics and detergents, along with non-toxic polyvinyl chloride resin.

With the development of additives and stretch blow molding technology, the use of PVC containers in food packaging has increased rapidly, and has begun to be used in beer and other areas containing carbon dioxide.

Packaging of gaseous beverages.

Linear polyester material is a new type of material that has entered the field of hollow blow molding in recent years, because its products have the advantages of glossy appearance, excellent transparency, high mechanical strength and good preservation of the contents of the container, and no pollution of the environment during waste incineration, so it has developed rapidly in packaging bottles, especially in the most widely used in pressure-resistant plastic food containers.

The use of polypropylene is also increasing year by year due to the modification of its resin and the advancement of processing technology.

Blow molding process.

Semi-molten tube blanks (parisons) obtained by extrusion or injection molding

It is placed in molds of various shapes.

Tube blank pass. Compressed air is added to blow it up so that it fits snugly against the cavity wall.

The molding method of hollow products is obtained by cooling and demoulding, and the molding process includes the manufacture of plastic parison and the blow molding of parison.

This molding method can produce various packaging containers such as bottles, pots, and barrels with different diameters and capacities, daily necessities and children's toys, as well as blow molded covers.

Blow molded products are hollow; Because of the injection molding port, there will be a small part of the product after molding, and there will be a process to cut it off, but if you look closely, you can still find it; Molding (injection molding) is the homogeneous plasticization of a thermoplastic or thermoset molding compound in a heated barrel and then pushed into a closed mold by a plunger or moving screw.

The blow molding process is a work of art.

The difference between injection molding and blow molding is mainly in three aspects: molding process, air utilization, and molding products.

Blow molding processing, also known as hollow blow molding, is a tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin. Injection molding is thermoplastic injection molding.

Detailed explanation of the differences: 1. Molding process.

Blow molding processing is to put it in the open mold while it is hot (or heated to a softened state), and immediately after the mold is closed, compressed air is introduced into the parison to make the plastic parison blow up and stick to the inner wall of the mold, and after cooling and demoulding, a variety of hollow products are obtained.

Injection molding is to melt the plastic material and then inject it into the film cavity, once the molten plastic enters the mold, it will be cooled according to the mold cavity pattern into a certain shape, and the resulting shape is often the finished product.

2. Air utilization.

Air is the enemy of injection molding, and if air is present during the manufacturing process, it can create air pockets or bubbles, which can create weaknesses in the product, resulting in product defects and possibly discarding. But with the method of blowing, air is very important, and the blow molding process is around the air entering the mold to launch and expand the product.

3. Molded products.

The blow molding process creates the shape of the plastic product, while the result of injection molding is the product itself. <>

Abstract:Bottle blowing machine: It is a machine that blows bottles, and the most simple explanation is that it can blow plastic particles or finished preforms into bottles through certain technological means.

Chacha blow molding machine: After spraying the liquid plastic, the wind blowing out of the machine is used to blow the plastic body to a mold cavity of a certain shape, so as to make a product, this kind of machine is called a blow molding machine, and it is also a kind of bottle blowing machine. 【Blow Molding Machine】The difference between blow molding machine and blow molding machineWhat is the difference between blowing molding and blow molding process.

The difference between a blow molding machine and a blow molding machine, in a broad sense, a blow molding machine is also a type of blow molding machine! Automatic blow molding machines include blow molding machines, blow molding machines, injection blow molding machines and two-step blow molding machines that are used more now!

Simply speaking, it is a machine, carefully speaking, it is a machine for the production of hollow containers, there are generally 2 kinds of wax early, pneumatic bottle blowing machine wheel and hydraulic bottle blowing machine, pneumatic generally produces less than 10L, and hydraulic pressure is generally considered for more than 10L, because of his high energy consumption.

Bottle blowing machine: It is a machine that blows bottles, and the most simple explanation is that it can blow plastic particles or finished preforms into bottles through certain process means.

At present, most of the blow molding machines are still two-step blow molding machines, that is, the plastic raw materials must be made into preforms first, and then blowing. Nowadays, PET is commonly used as environmentally friendly plastics.

Blow molding machine: After the liquid plastic is sprayed out, the wind blowing out of the machine is used to blow the plastic body into a mold cavity of a certain shape, so as to make a product, this kind of machine is called a blow molding machine. It is also a kind of bottle blowing machine.

The difference between blow molding and blow molding process.

Blow molding process: blow molding for pipe making (when the wall is very thin, it is a membrane), which is characterized by continuous production and is an extrusion process.

Bottle blowing process: It is specially used to make bottles, the tubular blank is squeezed or injected into the mold, blown, and the pipe wall is attached to the mold into a bottle shape, which is a combination of extrusion and injection molding process.

The production of plastic blow molding machine is mainly used to make plastic products, including blow molding bottles, tubes, plates, boxes, etc., and its processes generally include: 1. Preparation of blow molding raw materials: preparation of raw materials, including mixing and heating; 2. Blow molding melting:

Melt and extrude the mixed raw materials; 3. Blow molding: blow the melted glue into the mold with high-pressure airflow, and after cooling, take out the molded products; 4. Blow molding assembly: assemble and balance various components together to form a complete product; 5. Blow molding testing:

Inspect the quality of the products to ensure that the quality meets the standards; 6. Blow molding packaging: Blow molding products are packaged for transportation and sales.

Hello dear! Glad for your question! In fact, both processes have their advantages and disadvantages, and you must choose according to your own needs to see which one is more suitable for you!

1. The blow molding method is the blow molding method. It is one of the processing and molding methods of thermoplastics. According to the operation process, it can be divided into extrusion blow molding, injection blow molding, stretch blow molding and multi-layer blow molding.

Extrusion blow molding method: It is to use an extruder to extrude the tubular parison, put it into the mold while it is hot, and introduce compressed air to blow it to achieve the shape of the mold cavity, and the product is obtained after cooling and shaping. The advantages are:

It is suitable for a variety of plastics, can produce large-scale products, high production efficiency, uniform parison temperature and less equipment investment, cracking rows, etc. Therefore, extrusion blow molding has a great advantage in the current production of hollow products.2 Forging is one of the important methods for metal plastic processing. The main purpose of forging is:

Forming and modification (improvement of mechanical properties and internal structure). Among them, the latter is difficult to achieve by other process methods, and forging production also has the advantages of saving metal, high production efficiency and great flexibility.