Demand For Blow Molding By Pet Preform Manufacturers

Pet preform manufacturers have two pressing needs for blowing equipment. First, the price of plastic raw materials continues to rise, and manufacturers continue to reduce packaging costs to maximize profits. Therefore, it is necessary to use advanced blowing equipment to make lighter weights. Second, due to rapid market changes, manufacturers must be flexible in responding to the shorter life cycle of beverages, which corresponds to the increasingly frequent product update issues in PET bottle production. It takes time to change the mold to a minimum. These two pressing needs have created a big problem for blower equipment suppliers.

Closed loop technology refers to the integration of the process parameters of wire calibration into the process control system of the stretch blow molding machine to form a closed loop of automatic control and automatic adjustment. Intelligent machine control technology is designed to improve the quality assurance system of blow molding machines. Various data, such as bottle wall thickness, can be monitored via the AgrPETWallplus monitoring system. During operation, data deviating from the system rating will be immediately identified and this information will be transmitted to the control system of the preform heating unit of the blow molding machine in a timely manner. The control system will quickly reflect and individually control the heating lamps in the furnace. Rating. Therefore, even if the data of each bottle is different, the quality of the bottle produced is still stable and reliable under the condition that the initial set process parameters of the Pet Bottle Mould remain unchanged.

Quality Control Of Pet Preforms Is Very Important

Quality control is considered one of the most important aspects of this process in any industry. Especially in the manufacture of Pet Preforms, no matter how seamless your process is, or how efficient your plastic injection mold is, there will always be a few things that don’t go well.

This is the purpose of quality control. It allows you to control how your product is produced before it is released to customers. This way, you can ensure that your customers are 100% satisfied with the product.

What common deficiencies do you need to pay attention to during quality control?
Burn marks

When the gas size or venting holes are insufficient for the process, excess heat builds up. As a result, the final product tends to have some discoloration in the affected area.

Some plastic parts may appear different colors than originally intended. This happens when the masterbatch is not completely mixed or mixed. Most of the time, discoloration is not serious.

Sometimes excess material will flow out with the product. These extra plastic parts are called flashes. This is usually the most easily repaired defect after production.
Wave flow mark

The flow marks are the result of the twisted areas within the mold, leaving a distinct mark on the surface of the plastic article. Although it does not affect the function of the mold, it will affect the aesthetics of the product.
Short shot

When a short shot occurs, the plastic part that appears is missing some parts or features, making it completely useless. This may be caused by erroneous temperatures, insufficient size limiting the flow, insufficient pressure, excessive air retention in the mold cavity, and premature solidification of the mold.

When you have a solid quality control process, these defects are easy to spot once they occur. This means you have the opportunity to correct this situation and avoid further waste of materials and increased costs. Let go of your quality control and you may get a batch of products that you can’t sell. If these defective products fall into the hands of customers, you will immediately lose their trust.

Maintain your reputation as a manufacturer by building a solid quality control team.

The quality control process of the Pet Preform Mould is seamless, and once your product is delivered, it will not only reach but exceed the customer’s expectations.

China Pet Bottle Usage Is Growing Rapidly

Development status and trend of global non-fibrous PET

Non-fibrous PET was first introduced by Kodak as a substrate for photographic film. Since the mid-1980s, Coca-Cola introduced this variety into the beverage packaging field. Since then, non-fiber PET has developed rapidly and has been developed into bottles. , film, sheet, engineering plastics, packing belt (plastic steel belt) and other fields, only PET pellets for food grade bottles have mineral water, carbonated beverages, hot canned beverages, white wine bottles and beer bottles, etc. Classification. The global PET production capacity for packaging in 2005 reached 14.5 million tons, and its distribution is as follows:

China’s packaging and non-fibrous PET started late, but it has developed rapidly. In 2005, China’s Pet Preform production capacity reached 3.1 million tons, and the output reached 1.7 million tons, of which 1.2 million tons were sold domestically and 500,000 tons were exported. According to the current consumption of PET in bottles in Europe and the United States (17KG/person in the US, 20KG/person in Europe) and the proportion of total PET production capacity, there is still much room for development of PET production for packaging in China (currently 1.3KG/person), it is expected that its growth rate should be 15%/year, which means that the production capacity will be close to 6.5-7 million tons/year by the end of the 11th Five-Year Plan.

Conclusion: Due to the rapid growth in the use of disposable China Pet Bottle, new pressures are placed on environmental protection in China and the world. We often say a word “waste is put together as garbage, and waste is placed separately as a resource.” If we can do a good job in the recycling and utilization of waste PET, it will not only reduce environmental pollution, but also provide a new raw material route for human beings.

The Characteristics Of Pet Bottle Preform

The preform is shaped or shaped into a preliminary shape and size. In short, for Pet Bottle Preform, PET (polyethylene terephthalate) material is shaped into a shape similar to molding into a specific shape and then blown in a blow molding machine. Made into a bottle.

A feature of PET preforms is that the products made from them will be transparent. The surface is smooth and sparked to attract the attention of the buyer. This makes PET preforms an exquisite product. On the other hand, although PET preforms can produce a similar feel like glass. It is not as fragile as glass. This wall is very strong and appears on the container.

What is a pet:
PET or polyethylene terephthalate is an excellent material for the production of pure, healthy and food grade containers. It can be used to produce sparkling bottles that are almost as smooth as glass. It conforms to most food materials and does not affect the physical appearance, taste or smell. It is unbreakable, sturdy and durable, and easy to produce and store. Due to its high support capacity, it is ideal for storing carbonated products. Its permeability to gases is low and humidity increases the shelf life of the product. Due to its high chemical resistance, it is a good packaging material for harsh chemicals and acids. Lightweight, high strength, leak-proof PET bottles and containers are ideal replacements for glass. Containers of any shape, design, color and neck size can be molded. High recyclability and reusability ensure less environmental impact. It decomposes into carbon dioxide and water without chemical residues.

Pet bottles made with Pet Bottle Mould are an excellent waterproof and moisture resistant material. Plastic bottles made of PET are widely used in packaging water, soft drinks, motor oils, cooking oils, pharmaceuticals, shampoos, milk and inks. PET plastics have durability, good transparency and are easy to withstand impact.

Chinese Pet Preform Mould

Blow molding is a molten tube (called a parison or preform) formed of a thermoplastic material (polymer or resin). The parison or preform is placed in a cavity, which is expanded by compressed air to form a cavity. It is cooled before being taken out of the mold. Nowadays, China Pet Bottle have been loved and trusted by customers all over the world for their excellent quality and suitable price.

Any hollow thermoplastic part can be made into a blow mold. Parts are not limited to bottles, they have only one opening, and their diameter or size is usually smaller than the overall size. These are some of the most common shapes used in consumer packaging, but there are other typical blow moldings.

The basic concept of blow molding comes from the glass blow molding process. As early as the 1880s, there was a patented method for extrusion molding and blow molding of cellophane polymers. Early methods and materials for blow molding plastics were very rough and not suitable for large-scale production. It was not until the late 1930s that the first commercial machines and products were used to produce blow molded bottles. The main event that sparked and drove early commercial blow molding was the development of low-density and high-density polyethylene for blow molding and consumer packaging.

The main difference between blow moulds is the method of forming the parison; the size of the parison and the method of moving between the parison and the blow mould by extrusion or injection molding; whether fixed, shuttle, linear or Rotating.

In an extruded Pet Preform mold (EMM), the polymer melts and the solid extruded melt is extruded through a die to form a hollow tube or parison. The two halves of the cooling mold are then closed around the parison, pressurized air is introduced through the pin or needle, and it expands into a mold shape to form a hollow portion. After the hot plastic is sufficiently cooled, the mold is opened and the parts are taken out.

Jilian Mold 5-gallon Pet Preform Are Favored

Pet Bottle Preform are typically formed from hot runner molds. It is preferred to have a heat shield between the mold and the injection molding machine template. The thickness of the plate is approximately 12 mm and the heated plate must withstand high pressures. Exhaust gas must be sufficient to avoid local overheating or chipping, but the depth of the vent should not exceed 0.03 mm, otherwise flashing will easily occur.
Melting temperature

It can be measured by air to air. When producing PET preforms between 270 and 295 °C, the enhanced PET can be set at 290 – 315 °C.
Jet speed

Usually, the injection speed needs to be fast, which prevents premature coagulation during the injection process. But too fast, high shear rates can make the material brittle. Injections are usually completed in 4 seconds for the production of PET preforms.
Back pressure

The lower the better, to avoid wear. Generally no more than 100 bar. The production of PET preforms usually does not require back pressure.
Residence time

Do not use excessive residence time to prevent molecular weight degradation. Try to avoid temperatures above 300 °C. If the shutdown time is less than 15 minutes. Only air injection is required; if it is more than 15 minutes, clean it with a viscosity PE and lower the temperature of the barrel to the PE temperature until it is turned back on.

(1) There should not be too much recycled material, otherwise it will easily cause a “bridge” during the blanking, which will affect plasticization.
(2) If the mold temperature is not well controlled or the material temperature is not properly controlled, it is easy to produce “white fog” and it is opaque. The mold temperature is low and uniform, the cooling rate is fast, the crystallization is small, and the product is transparent.

Jilian Plastic Mould is a professional manufacturer of 5-Gallon Pet Preform. If you choose us, you can effectively avoid some problems in the production process and ensure that you can get satisfactory products.

China Pet Bottle Have A Better Reputation

It seems that the extrusion flash is only a one-time phenomenon in the molding process. However, the way the flash is designed is critical to maintaining the integrity of the Pet Preform. Here are some things that might go wrong:

The flash bag did not fill up enough space, so the pressure to push the plastic back into the container was too small to properly weld the gap. This condition is characterized by a “v” shaped notch at the pinch, indicating that the seam may be weak where the seam may crack.

The flash pocket is not large enough to hold all of the flash material, which creates excessive pressure towards the container. This creates a very thick plastic bump at the pinch. Depending on the characteristics of the plastic, the cooling rate and other processing factors, this extra thickness may cool at different speeds, move the volume, and cracks may occur.

If the processing conditions or mold pinch-off geometry is incorrect for any reason, it may have a negative impact on the integrity of the parison bond in the pinch-off area where the edges of the two molds are joined together.

After molding, the flash is removed manually or mechanically. Care must be taken, otherwise the container/part may be damaged, just like any post-forming process.

Flash can affect the appearance and function of plastic containers or components. Rough or excessive flash is visually unattractive. Excessive flash around the bottle neck can interfere with proper operation of the lid or cap.

Good extrusion blow molding design and engineering repair flash

Many adjustments can be made to solve the flash and pinch-off problems. This is mainly science – there is still a little art.

Pay special attention to the pinch-off area on the mold to ensure proper clearance. When the part is removed from the mold, too small gaps and flash edges will fall into the molded assembly. The gap is too big, it is difficult to trim, and it looks bad. Check the mold regularly to make sure the pinched land is in good shape.

Changing the parison thickness and clamping speed helps to adjust the amount of plastic that is pressed back into the container.

Changing the viscosity of the parison can adjust how much material will flow back into the container.

Control the duration and pressure of air blown into the mold. Make sure the process provides proper ventilation.

Test different flash pocket shapes. Adding a baffle or channel changes the speed at which the plastic is pushed back into the container and also affects the cooling rate.

Jilian Plastics has continuously adjusted the design and crafts of China Pet Bottle. We have also won the love and praise of many customers and determined to become a better reputation in the market.

The Future Development Of Pet Bottle Preform

Pet Bottle Preform have been in use for quite some time, but demand has surged worldwide in recent years. The availability of PET materials places great emphasis on packaging because high quality production reduces costs. In the next five years, there will be a sustained annual growth rate of 4.6% year-on-year. This is an amazing growth from any size. In addition to established economies, transition economies and emerging economies have become important players in the market.

Sustainable growth will bring new demands on PET packaging materials to new heights

Increasing attention to attractive packaging and personal hygiene is the main reason behind growth. Due to the reliability and robustness of PET bottles, PET bottles for wine, spirits, pharmaceuticals and dairy products are required.

According to the market report, the global market will grow significantly from the current $48 million to $60 million, with an annual growth rate of approximately 4.6%. As it continues to grow, it will open up new horizons in the next five years. It is estimated that during the above period, the consumption per ton will reach 20 million tons.

The reason for such amazing performance

Experts say that in 2010, PET bottles were popular around the world for their simplicity, durability, convenience and affordability. This trend indicates a bright future. Very lightweight, ideal for mobile applications. There are various reasons behind it:

1. Due to the prevalence of bottled water, ready-to-drink beverages, soft drinks and juices, the demand for premium and durable packaging materials PET is the best alternative.

2. Household cleaning products and pharmaceuticals use PET instead of traditional packaging materials. This is a cost-effective and convenient alternative.

Jilian Plastic Mould is the leader in the global Pet Bottle Mould market. We are from China Huangyan and have the perfect advantages of making in China. Our products are durable and affordable, which is difficult for everyone to refuse.

Use Pet Bottle Preform To Make Plastic Bottles

The first stage of bottle manufacturing is stretch blow molding. The PET is heated and placed in a mold in which the PET is in the shape of an elongated tube. (The process of pressing a plastic into a mold is called injection molding.) The PET tube, now called a Pet Preform, is then transferred to a second bottle mold. A thin steel bar called a mandrel slides inside the parison, where it fills the parison with high-pressure air, and the stretch blow begins: the parison is blown and stretched due to pressurized air, heat and pressure In the mold, the shape of the bottle is presented. To ensure that the bottom of the bottle maintains a uniform flat shape, a separate plastic part is simultaneously attached to the bottle during the blow molding process.

The mold must be cooled relatively quickly so that the newly formed parts are properly set. There are several direct and indirect cooling methods that effectively cool the mold and plastic. Water can indirectly cool the mold and plastic through the tubing that surrounds the mold. Direct methods include the use of pressurized air or carbon dioxide directly on the mold and plastic.

Once the bottle (or, in continuous manufacturing, the bottle) is cooled and solidified, it can be removed from the Pet Bottle Preform. If a continuous molding process is used, the bottles need to be separated by trimming the plastic between the bottles. If a discontinuous process is used, sometimes excess plastic will penetrate the mold during the manufacturing process and needs to be trimmed. After removing the bottle from the mold and removing the excess plastic, the bottle can be transported.

How Is The Pet Bottle Preform Made?

Most of the work of blow molding Pet Bottle Preform is done on large machines. Tiny plastic particles flow into a large bucket through the funnel at the top. The barrel is then heated to allow the plastic to begin to melt into a moldable liquid form. They do this through a combination of friction and heat, which needs to be set at the right temperature. A little less, the particles will not melt completely, resulting in protrusions and depressions in the finished product. The molten plastic is then injected into the selected mold, whether it is a plastic handle, a gallon plastic pot, a jar, and the like. Here is where it cools, allowing it to harden into the inner shape of the mold, forming the final shape. The mold can then be carefully opened and the plastic container removed.

Machines that make soda bottles or jars must be carefully maintained and assembled to work as a complete unit. A plastic bottle company works with people who make molds from steel or aluminum to ensure that the molds are properly installed in the machine and that the expected end result of a strong plastic product is obtained. The injection molding machine is a highly complex machine that requires monitoring of all molding processes. They need to make sure that the right materials are used no matter what the finished product is made, because some plastics are not as effective as other plastics in some containers. They also need to ensure that the shape of the finished part is accurate and that no rough edges, cracks or defects will cause the product to fail. Most importantly, it needs to ensure that all parts of the entire machine work together to create a smoother efficiency so they can produce the same, ideal plastic container.

The basic components of a good plastic injection blow molding machine look simple enough. There is a hopper in which plastic pellets are fed into the machine, a heater in which the parts are melted into a liquid form, the mold cavity separates the heater from the mold, and then the Pet Bottle Mould itself. However, it is important that all of these components do their utmost to ensure that the product is produced very well. If any part can’t do this, the product won’t go wrong.