Three Pet Bottle Mould Blow Molding Process

There are three Pet Bottle Mould blow molding processes:

1. Injection blow molding
In injection blow molding, a blow molding rod or mandrel is used throughout the process. First, the parison is injected into a split cavity around the rod. The formed parison looks like a test tube. The mandrel transfers the parison to the blow molding machine, forcing the air to produce the final shape in the blow molding machine. The rod is then transferred from the machine and the finished product is extruded.

2. Extrusion blow molding
Extrusion blow molding can be continuous or intermittent. In continuous extrusion blow molding, the parisons are continuously fed into the mold, and each parison is cut by the blade during molding. When the metal mold is cooled, the intermittent extrusion blow molding extrudes each new plastic from the metal mold, and the parison is fed into the mold only after the previous parison is extruded.

Extrusion blow molds are generally much cheaper than injection blow molds and can be produced in much shorter times. Extrusion blow molding is suitable for smaller runs. Advantages include savings in tooling costs and reduced production time, while shortcomings often include less wall thickness control and more waste.

3. Injection stretch blow molding
Injection stretch blow molding combines injection molding and blow molding processes. The plastic is first molded into a solid preform to form a threaded neck.

Once the Pet Bottle Preform cools, it is fed into a stretch blow molding machine. The preform is then reheated using an infrared heater and the preform is blown into the plastic bottle with forced compressed air.

What molding process does your product need?
What kind of manufacturing process is right for your next project? Jilian mold engineers have decades of experience in understanding what materials and molds are right for you. Contact us to discuss your new plastic design or product ideas and we will take you through the manufacturing process that best suits your project needs.

Jilian Mold China Pet Bottle The Most Suitable Price

Extrusion blow molding processes are most commonly used to make hollow Pet Bottle Mould. These containers can be used in almost any size, from small squeeze bottles.
Materials used in blow molding

There are many materials for blow molding, but they are limited to thermoplastics.

Polyethylene is the most commonly used in blow molding materials, more specifically HDPE and HMWPE (high molecular weight polyethylene). The use of these high quality materials is more cost effective than the performance of low density polyethylene.

While these materials may be more expensive, the walls of the container can be thinner while still producing a high quality end product. Other materials used in blow molding production include PP (polypropylene), PVC (polyvinyl chloride) and polyethylene terephthalate.
High-density polyethylene

HDPE stands for high density polyethylene and its inherent properties make it suitable for a variety of applications. It has high tensile strength, high rigidity, excellent chemical and solvent resistance, and meets FDA standards for direct food contact. Each year, more than 8 million tons of HDPE are used to make blow molded containers such as detergent bottles, milk jugs, and trash cans.

This accounts for almost a third of the world’s annual HDPE production. Although the container for consumer goods constitutes a large part of the blow molded product, it is also used in many other products. Toys, large storage tanks, 55-gallon drums and gas tanks for transporting liquids or powders are just a few of the other products made with HDPE.
What products have been created by blow molding?

Blow molded products can be used to produce high quality, functional and lightweight containers that are ideal for a wide range of applications. Although the materials may vary, depending on the product being produced, the durability and cost-effectiveness of blow molding are consistent.

Jilian Plastic mold produces high quality China Pet Bottle blow molding products for everyone. Welcome to leave a message and we will bring you the most suitable price.

Three Methods For Creating Blow Pet Bottle Preform

Pet Bottle Preform blow molding is a process for making hollow plastic parts. There are three unique processes for creating blow molded parts, including:
Stretch blow molding

This blow molding process involves the production of hollow objects, such as bottles, having a biaxial molecular orientation. Biaxial orientation provides enhanced physical properties, clarity and gas barrier properties, all of which are important in products such as carbonated beverage bottles.

There are two different stretch blow molding techniques. In the one-step process, the preforms are injection molded, adjusted to the appropriate temperature, and blown into the container – all in a continuous process. This technique is most effective in special applications, such as jars, where high productivity is not required.

In a two-stage process, the preform is injection molded, stored for a short period of time (usually 1 to 4 days), and blown into a container using a reheat blow (RHB) machine. Due to the relatively high cost of molding and RHB equipment, this is the best technology for producing large capacity products such as carbonated beverage bottles.
Injection blow molding

The material is injection molded during the injection blow molding process. The hot material still on the core pin is then indexed to the blow station where it is blown into the bottle and allowed to cool. The bottle is then transferred to the next station and ejected. Injection blow molding has more precise details than extrusion blow molding in the neck and mouth (thread) areas. Since the orientation is seldom occurring, there is almost no improvement in physical properties during the injection blow molding process.
Extrusion blow molding

The extrusion blow molding process begins with a conservative extrusion of the parison or tube using a mold similar to that used to make plastic tubes. The parison is then extruded downward between the two halves of the open blow mold. When the parison reaches the proper length, the mold closes, grasping and keeping the end of the neck open, and pinching the bottom end to close. A rod-shaped needle is inserted into the neck end of the hot parison to simultaneously form a threaded opening and expand the parison in the cavity. After the bottle has cooled, the mold opens to eject the bottle. Excess plastic is trimmed from the neck and bottom pinch areas.
Blow molding and injection molding

Injection molding and blow molding are the two most popular methods of producing high quality, low cost plastic parts and products, but they differ. The most obvious difference between injection molded parts and blow molded parts is the injection molding to make solid parts, while blow molding to make hollow parts.

If you need something that requires a hard wall, injection molding may be what you want. Some common examples of parts made by injection molding are caps, combs, and computer and television housings. Conversely, if you are looking for a flexible, operable, liquid-filled product, such as a bottle or cooler, blow molding is what you need.

If you are looking for a reliable and reliable Pet Bottle Mould manufacturer, then welcome to contact Jilian Plastics. We are the most experienced and reliable pet prefabricated supplier in China and the most reliable choice. .

Pet Preform Production Process

From ordinary keyboards to all tiny plastic parts, plastics have an appearance in almost every respect, presenting countless different shapes and sizes. How does blow molding a Pet Preform or plastic product work?
Plastic production process

Many of these plastic products begin with a process called plastic extrusion. Back in the late 18th century, this process involved heating small plastic pellets at elevated temperatures, forcing them to form and allowing them to cool and harden. The use of a heated screw feeder helps to push the molten plastic into the mold.

After this process is completed, many of these forms are heated again for another process called sheet or film extrusion. Then, the remelted plastic is cooled and pressed by a calender roll to diffuse and harden to form a plastic sheet.
The benefits of extrusion blow molding

These sheets can be reworked in another process called coextrusion. To this end, multiple extruders are melted together and forced into a single mold. This gives the plastic product a softer feel, a smooth surface and a gripping surface.

The last plastic processing is thermoforming. This process uses a plastic sheet that is heated until it becomes soft and then pressed into the mold. Vacuum is sometimes used to force it into the complex form required.

Because plastics play such a wide range of roles, the number of processes that mold and shape them is not surprising. From the keyboard to the Pet Bottle Preform, plastic is an important industry.

China’s Manufacturing Of Quality Pet Bottle Preform

If you are looking for the best manufacturer of Pet Bottle Preform blow molding products, then turn your attention to Chinese manufacturers. The experienced and friendly staff of Jilian Plastics exceeded customer expectations and ensured their satisfaction for more than 38 years.
Extrusion blow molding

They also have a variety of blow molding traffic safety products. This includes drums, roadblocks, and of course various traffic cones.

They also provide comfortable seating for sporting events, theatre and other types of cultural events.

They also manufacture various types of reservoirs and septic tanks. These special types of products are usually single items, but can be mass produced if a large number of these products are required.
Household blow molding products every day

They also offer coolers to help keep your food cool during any event.

They make fans that help you keep your home cool during the summer night and make toys and sports equipment for all your sports needs.

In addition to carrying jugs, household products, wheels and suitcases, they also offer an option for customers to produce, assemble and deliver the products they order to one place.

Except for Sunday, they are almost always open and open 24 hours a day. In addition, they serve customers in many different countries around the world.

As a Pet Bottle Mould manufacturer, all of their blow molding products are designed to be of the highest quality. These are some of the products they use throughout the manufacturing process.

China Pet Bottle Reliable Service

Pet Bottle Preform injection molding process is one of the most important techniques for processing plastics. PET plastic bottles, most plastic packaging plants will use blow molding production process, but the injection molding process has a unique unique processing advantage. For PET for injection molding, the technician needs to consider many factors.
Introduction to polyester plastic

The PET chemical name is a polybutyl terephthalate, also known as a polyester. At present, the most commonly used customer is GF-PET, which is mainly used for preforms.

The rheological properties of PET in the molten state are better, and the effect of pressure on viscosity is greater than the effect of temperature. Therefore, the flow characteristics of the molten material are mainly changed by the pressure.
PET characteristics and characteristics:

PET has a glass transition temperature of about 165 ° C and a material temperature range of 120 to 220 ° C. PET has a strong hygroscopicity at high temperatures. For glass fiber reinforced PET materials, bending deformation easily occurs at high temperatures.

The crystallinity of the material can be increased by adding a crystal strengthening agent. Transparent products made of PET have gloss and heat distortion temperatures. Special additives such as mica can be added to the PET to minimize bending deformation. If a lower mold temperature is used, a transparent product can be obtained by using an unfilled PET material.
Injection molding process:

The injection molding method is mainly used to enhance the molding of PET. A screw type injection molding machine is usually used. Screws usually need to be hardened to avoid wear after long-term use. The length of the nozzle hole of the injection molding machine should be as short as possible, and the diameter of the injection molding machine should be controlled to about 3 mm.

Reinforced PET has a melting point of up to 260 °C. To prevent nozzle clogging, a higher power heater should be installed. Further, the tip end of the nozzle hole is preferably machined into an inverted cone as shown in Fig. 1, so that the molten material in the flow path and the nozzle can be easily cut.
Injection molding machine:

Injection molding is mainly used to enhance the molding of PET. PET can usually only be formed by a screw injection molding machine.

It is best to choose a mutant screw with a reverse ring on the top. This screw has a large surface hardness and wear resistance, and the ratio of length to diameter is not L / D = ( 15 ~ 20 ) : 1 compression ratio For 3: 1.

Materials with too large L/D stay in the barrel for too long, and excessive heat can cause degradation and affect product performance. The compression ratio is too small, the heat generated is small, the plasticization is easy, and the performance is poor. On the other hand, the glass fibers will break more and the mechanical properties of the fibers will decrease. When the glass fiber reinforced PET is reinforced, the inner wall of the cylinder is seriously worn, and the cylinder is made of a wear resistant material or lined with a wear resistant material.

Since the nozzle is short, the inner wall needs to be polished and the hole is as large as possible. Hydraulic brake valve nozzles perform well. The nozzle should have insulation and temperature control measures to ensure that the nozzle does not freeze and clog. However, the nozzle temperature should not be too high, otherwise it will cause salivation. Before starting molding, you must use low pressure PP material and clean the bucket.

Are you considering choosing a China Pet Bottle? Then Jilian Plastic Mould is your reliable partner. We have many years of experience in the market and can bring you high quality products and reliable services.

The Risk Involved In The Manufacture Of Pet Preform Mould

The production of Pet Preforms is not so straightforward in reality. Various factors and practices must be applied correctly to ensure the successful production of PET bottles.
Therefore, your operation must prioritize the following blow molding requirements:

Adhere to precise preforms and bottle designs
Use the appropriate grade of PET resin pellets
Manufacturing high quality preforms using excellent injection molding technology
Ensure that the preform has the required temperature distribution before it is transferred to the blow molding stage
Ensure that all stages (stretching, pre-blowing and blow molding) are fully timed
Ensure equipment and molds are in good condition and meet GMP and OSHA requirements
Ensure that peripheral services, including chilled water and compressed air, are fully supplied

Some of the deficiencies that may be encountered during the production process include:

The production of acetaldehyde (AA), in which case the liquid in the bottle produces an acidic taste (similar to citrus fruits). This can have catastrophic consequences, especially when related liquids, such as water, cannot hide this taste. When the preform molding temperature exceeds 260, AA production is carried out simultaneously with PET production.
This and other technical deficiencies are explained here.
Defects that may result from negligence in production, such as leakage, poor tensile strength, undesired shape and size, uneven thickness, and the like.

The following may interfere with your original efficient production plan:

power failure
Equipment failure, especially for peripheral machines
Equipment maintenance routine visit
Industrial action and other conditions affecting the supply of labor
Bank holiday

The risks involved in running PET plastic manufacturing equipment can generally be divided into four categories, namely:

Health and safety — exposures can cause injury or illness
Exposures — These properties are related to fire (equipment failure, flammable materials, etc.). And damage to critical components such as molds
Product safety and the complexity/legality of doing business globally, such as product standards and regulations, third-party transfers, etc.
Risks involving transactions and online information transmission

Any insurer who is willing to insure your Pet Preform Mould manufacturing small business is likely to refer to a checklist that highlights various physical damage and time factor exposures.

Changes In The Development Of China Pet Bottle

In recent years, with the improvement of residents’ consumption awareness and purchasing power, China’s beverage industry has made great progress, the market scale has been expanding, and products have gradually diversified. It has evolved from a single soda to include carbonated drinks, juice drinks and energy drinks. The drinking water and beverage systems within the company provide consumers with more choices.

Pet Preform have only been in China for 10 years. The history of PET bottles and hot filling in China is relatively short, only about 4 years, but the development momentum surpasses most other packaging containers. This momentum is mainly attributed to tea drinks. Rapid development. As we all know, tea beverages and fruit juice beverages are hotspots for beverage development. In China, the output of tea beverages in 2000 has exceeded 1.5 million tons, and most of them use PET hot-filled bottles, and the proportion has an upward trend.

Filling microbe-sensitive products such as tea, juice, wine, dairy products, sauces, vegetables, spices, etc. is a challenge to traditional bottling techniques, as microbes can cause bacteria and mold to grow, causing damage to the color and taste of the product. . The problem with the traditional method is to use hot filling, but the hot filling technology has many shortcomings, such as high container cost, long-term exposure to high temperature conditions, resulting in loss of flavor and high energy consumption.

Now the machine can be called a small soda plant. It only needs qualified water, electricity and carbon dioxide, and it is equipped with syrup to make high-quality carbonated drinks on the spot. As the largest component of the ready-to-eat family market, brewers are now widely used throughout the world. The beverage giants Coca-Cola and Pepsi have long been used extensively. The basic configuration of global fast food chains such as McDonald’s, KFC and Pizza Hut is necessary. Brewed beverages have unparalleled features and advantages over standard packaged beverages. The beverage brewing machine is only a container made of paper cups, which is easily degraded and is increasingly threatened by environmental pollution for human beings. Now it is the choice that beverages have benefited for hundreds of years in the contemporary era.

As a food packaging, the main requirement is to facilitate storage and transportation, reduce the loss of original performance, no additional damage, increase sensory enjoyment, and reasonable price. At present, the main means of liquid food packaging are: ordinary packaging, secondary sterilization packaging, including canning, bottle and bag, hot filling, vacuum packaging, plastic packaging, radiation sterilization and aseptic packaging. Aseptic packaging of liquid foods is a new technology developed in recent years, and its development is very rapid due to its obvious advantages.

The domestic beverage industry market is an emerging industry with slow development after reform and opening up. The renewal of beverage machinery and equipment has also driven the development of China Pet Bottle industry. From the Chinese beverage industry to nothing, from small to large, from basic to scale gradually become a society. One of the important industrial foods essential to the market, and presents four major developments. The development of the beverage industry has also driven the development of the national economy in terms of comprehensive factors, and made due contributions to improving the living standards of the socialist people. It is believed that the beverage market environment will have new developments in the diversified demand for the beverage machinery market.

Injection Molding And Blow Molding Of Pet Bottle Preform

Every Pet Bottle Preform in an injection molding plant requires a special manufacturing process, and different products can vary greatly. Means for producing a solid injection molding, and blow molding for producing a plastic product having a hollow region, such as bottles and containers.

Injection stretch blow molding combines injection molding and blow molding processes. The plastic is first molded into a solid preform to form a threaded neck. Once the preform cools, it is fed into a stretch blow molding machine. The preform is then reheated using an infrared heater and the preform is blown into the plastic bottle with forced compressed air.

Injection molding and blow molding are two core processes in plastics manufacturing. Products produced through these processes are widely used in the automotive, food service packaging, electronics, medical devices, irrigation, dental, firearms, energy and environmental industries.

To help you better understand the different manufacturing methods available in the project, we outline the main injection and blow molding methods used by plastics manufacturers.
Injection molding process

Injection molding is used to make larger quantities of plastic products ranging in size from large parts to small parts requiring micro-precision.

There are many types of manufacturing methods that are classified into injection molding, such as thermoplastic injection molding, overmolding, insert molding, cold runner molding, and hot runner molding.

Thermoplastic injection molding
Thermoplastic injection molding uses a thermoplastic polymer, which means it becomes liquid when heated. Unlike thermosets that are cooled to a permanent solid, the thermoplastics can be combined into a liquid after cooling to a solid.

Overmolding
Overmolding, or two injection molding, is the process of covering an injection mold on another material, such as metal, to improve product performance or durability. A rubber-like compound, called a thermoplastic elastomer (TPE), is a commonly used overmold material. An example of a TPE overmolding application is a handle on a toothbrush. Overmolding can also be used to seal products and parts made from several injection molds.

Insert molding
As with overmolding, insert molding is an injection molding process that combines two or more components into one finished product. Insert injection molding inserts the component into the injection cavity and the plastic material fills around the insert. The insert can increase the strength of the product and does not require additional parts to reduce the weight of the product.

Cold runner injection molding
The cold runner mold uses a gate to fill the flow path for injecting plastic resin into the mold cavity. In two plate molds, the runner system and parts are connected and the discharge system can be used to separate the pair from the mold. Cold runners can reduce waste by recycling and regrinding materials, but this can also increase overall cycle time. The cold runner system can be used with a variety of polymers and can be easily changed in color.

Hot runner Pet Bottle Mould
The hot runner mold uses a manifold to heat the molten plastic resin and then inject the material into the mold cavity through the gate. The two main types of hot runner molds are external heating and internal heating. Externally heated molds can be used with polymers that are less sensitive to thermal changes, while internally heated hot runner molds allow for better control of material flow.

Because hot runner molding does not require the use of flow channels, potential waste is reduced and the recycling, regrinding and processing of the original plastic does not affect the overall cycle time.
Blow molding process

In the blow molding process, the raw material plastic is formed into a hollow tube, and one end of the opening is called a parison. The parison is pressed into a cooled metal mold and compressed air is forced into the parison. When the molded plastic cools and hardens, the metal mold opens and discharges the product.

Pet Bottle Preform Industry

We can learn about plastic product manufacturers through the process: the plastics manufacturing methods they use, or the industries they serve, such as packaging, automobiles, etc. The final product to be produced determines the type of process to be used. Therefore, most manufacturers are only good at one or two methods. Larger factories may have three to four, but few have every process. A company that supplies products to the electronics industry may have an injection molding process to make TV casings and other components. The blow molding process used to make Pet Bottle Preform is of little use to them.

The plastics industry can be simply understood as a “manufacturer of plastic products”. Along the plastic production line, it actually has extensive links with plastic material manufacturers, resin manufacturers, Chinese additive suppliers, and many other upstream or downstream manufacturers before the product is finally produced and delivered to consumers.

The extra work that needs to be done after the parts are manufactured belongs to secondary processing. This includes printing, painting, polishing, trimming, and the like. Although most manufacturers are equipped with some form of general secondary process, some specialized processes, such as chrome plating, are usually done by experts.

Plastics are widely used in many industries such as packaging; electronics and electrical; automotive; construction and construction; household products and more. Quite a number of manufacturers sell their 5-gallon Pet Preform and products to other industries, and some manufacturers trade.