China Pet Bottle Makes You Satisfied

Pet Preform packaging has always been a large-volume production model, and pet preform manufacturers can only rely on large-scale production to win profits. Because the profit of a single pet preform is very low. At the same time, the pet bottle needs to be shaped by the mold, so if you need a personalized pet bottle you need to re-open the mold.

However, with the development of the market, high-end luxury goods consumption is increasingly sought after by the market. Young people are increasingly demanding personalized packaging. For example, last year’s personalized pet bottle label launched by Coca-Cola, printed on the pet bottle label with different labels such as “youth” and “happy” to cater to the individualized appeal of young people. Has won the pursuit of many young people. Nowadays, there is a growing demand for personalized customization of pet bottle packaging in China. In this regard, we believe that there are several professional private custom pet bottle companies that are urgently needed to meet this demand in the market. This market will be special, no longer a large batch of pet bottle ordering orders, but focus on the production and sales of boutique, personalized pet bottle packaging.

Jilian Plastic Mould is a China Pet Bottle manufacturer who is willing to keep trying. We are also improving the performance of our products in terms of personalization. We welcome all interested customers to come and contact us, we will bring you satisfaction. Products and services.

China Pet Bottle Are Well Received

China’s PET containers are currently mainly limited to biaxially stretched PET blow molded bottles. China’s two-way stretch PET blow molding bottles started late in the PET packaging industry, but since the introduction of the injection-blown PET bottle production line in Japan in the 1980s, it has achieved good results in beverage packaging represented by Coke. Subsequently, a large number of foreign advanced injection-blown PET bottle production equipment were introduced. At the same time, on the basis of digesting foreign advanced technology, a two-step PET stretch blow molding machine with independent intellectual property rights and suitable for China’s national conditions was constructed. It is used in conjunction with a universal injection machine to blow PET preforms from Pet Preform made with universal injection machines. In the domestic two-step biaxial stretching PET bottle blowing machine, some models can not only produce ordinary PET biaxial stretching bottles, but also heat-resistant biaxially stretched PET bottles. The volume of products that can be produced basically covers the volume. Imported equipment can produce a wide range of fields from tens of milliliters vials to 5 gallon vats.

These simple blow molding machines not only have the advantages of low cost and strong maneuverability, but also can produce high-quality and practical two-way stretch PET blow bottles with proper control, which has been widely recognized by PET processing circles at home and abroad. In addition to a large number of domestic use, it has been partially exported. Although there is a gap between these equipments and imported advanced equipment, such as low productivity, poor automation, and poor dimensional accuracy of the products, for some particularly demanding applications (such as packaging for Coca-Cola, Pepsi, etc.) There are still some difficulties in application.

In addition, the production equipment of multi-layer co-blow molded PET bottles has yet to be developed in China, but the development and utilization of the domestic two-step biaxial stretching PET bottle blowing machine has played an important role in promoting the rapid development of PET bottle production. . At present, China Pet Bottle manufacturers have large-scale backbone enterprises with the most advanced PET bottle automatic production lines manufactured by well-known enterprises in the world. At the same time, there are also a large number of simple and practical types of different automation degrees designed and manufactured by China. The small and medium-sized enterprises of the two-way PET bottle blowing machine show an unprecedented situation in which flowers bloom and flourish.

China Pet Bottle Does Not Let You Down

In life, we can see PET bottles everywhere. How to identify the advantages and disadvantages of Pet Preform in the face of a wide range of PET bottles, please elaborate on this issue for you.

1. One-step blown PET bottle has less mechanical scars, good air tightness between bottle mouth and cap, small air leakage rate, high transparency and beautiful appearance. The biggest technical problem is that it is not easy to control the uniformity of the bottle wall, the thickness is large, and it is easy to produce a convex deformation.

2. The PET bottle blown in the two-step method has more mechanical wound marks and a slightly smaller transparency than the one-step method. The PET bottle is blown in a two-step process, and the preform is first pre-formed and shaped by injection molding, and then sent to the next process for secondary heating and blowing. During the conveying process of the hopper and storage in the hopper, mechanical wounds are inevitable, and the preforms are rubbed together to cause damage to the preform and the blank. Therefore, the airtightness of the bottle cap and the bottle mouth is poor, and the air leakage rate is one step. Blowing is high. The advantage is that the bottles blown out by the technique are tested by an ultrasonic thickness gauge. The bottles have uniform wall thickness and small thickness error, and it is not easy to produce a convex deformation after filling the beer beverage.

Jilian Plastic Mould is a China Pet Bottle design and supplier that constantly improves production technology. If you are interested in us, please contact us and believe that we will not let you down.

Jilian Plastics China Pet Bottle Not To Be Missed

PET or polyethylene terephthalate accounts for about 70% of the total number of soft drink bottles produced worldwide, comfortably making it the most popular material choice, over aluminum and glass.

In a wide variety of compressors, from standard models to custom or custom systems, there are some common themes that combine them. This is achieved by producing a variety of PET bottles arranged on supermarket shelves. Let’s take a look at the role of compressors in the PET bottle manufacturing industry and how to find high quality compressor valve parts.

The role of the compressor

Today, there are many ways to produce PET bottles in the Pet Preform manufacturing industry. Regardless of which system is used by the PET bottle manufacturer, the compressor is always the most demanding and careful part of the entire operation. This is because all processes require injection of compressed air during the molding of the bottle.

Due to the high temperature, high pressure and continuous repetitive extreme conditions, the compressor must precisely control the air flow through the system as needed. Therefore, this is crucial to the success of the operation.

Traditionally, the PET bottle manufacturing industry is driven by a reciprocating compressor that operates by using a piston to create pressure within the system. These compressors typically require more than 650 psi of factory air to produce more complex design products. Although companies now prefer to use low-voltage systems to conserve energy and provide more cost-effective processes. This allows centrifugal compressors to be used in the manufacturing industry, although they do not produce the same power as reciprocating compressors of the same size, they produce more airflow and, more importantly, they are more energy efficient.

Importance of compressor valves

Compressor valves in the PET bottle manufacturing industry operate under high pressure for extended periods of time. This requires extremely durable parts to maintain consistent and efficient performance. The purpose of the valve is to regulate the flow of air within the PET bottle production system, supply air to the injector when needed, and control the operating pressure within the system.

One of the main problems to be noted in the production of PET bottles is the production of acetaldehyde. This is an organic by-product formed on the plastic when the temperature exceeds 260 ° C, which is exceeded during the blow molding process. In order to minimize the amount of acrylic acid produced, tight control of the air flow rate is critical to reducing shear forces, which can cause overheating of the material and can cause bottle molding problems during the molding process.

Jilian Plastic Mould is a reliable and reliable China Pet Bottle design and manufacturer. If you want to find a reliable Chinese pet bottle, then we are the choice you should not miss.

What Are The Advantages Of Pet Bottle Preform?

Pet Bottle Preform are plastic products that are processed by injection molding. They are impervious and insulating. They are usually used for the storage and transportation of some important liquid objects. Commonly, there are bottles for blood tests in hospitals. The application introduction and improvement methods of pet bottle preforms are described in detail below. The following is an introduction to “Improved methods for analysis and shortcomings of pet bottle preforms.”

From the current situation, waste plastics have only achieved “recycling” but have not really “re-use”. The main methods of recycling plastic waste in countries around the world are to discard, landfill, incinerate, or ship to other countries. Only 11% of the waste plastics recovered in Europe were truly reused, 14% shipped abroad and 21% were burned. At the Plastics Recycling Technology Conference held in Brussels by the European Plastics Manufacturers Association (APME), experts believe that the European plastics recycling industry is in a difficult situation.

In China, 13% of landfill waste treatment methods are used each year, and incineration accounts for 2%, and the recycling rate is only 5%.

Incineration and landfill of plastic waste not only cause environmental pollution, but also endanger human survival and development, but also cause huge waste, which is contrary to the sustainable development strategy. Therefore, in order to recycle, the recycling of waste plastics can produce economic and social benefits.

According to the medium and long-term development plan of science and technology, the strategic goal of planning waste plastics in the field of regeneration is: to regenerate and use waste plastics of 2.93 million tons, and to achieve a recycling rate of 50%, research waste plastic materials recycling technology, and propose the current waste plastics recycling. An improved method of the process.

On the basis of solving the pretreatment technology, we should review the advanced experience of foreign countries, research and promote the waste plastic recycling technology suitable for China’s national conditions, and improve the performance and quality of recycled plastic products. It can be seen that China has a long way to go to recycle and recycle waste plastics, and it is imperative to improve the recycling rate of plastic waste.

Jilian Plastic Mould is an experienced pet product design and manufacturer in China. We offer a full range of quality and guaranteed products, from 5-Gallon Pet Preform to caps, handles, etc., as long as you have a need, we Can satisfy you.

The Selection Of Pet Bottle Preform

The transparent pet bottle is a transparent white pet packaging container formed by blow molding. After injection molding, it forms an intermediate product Pet Bottle Preform, and then blow molding to form a pet bottle, which is a two-step molding principle. The transparent pet bottle is formed into a transparent pet bottle preform through special processing of polyester material. The transparent pet bottle preform is blow-molded under specific pressure and temperature conditions, and the volume in the mold of the mold is in accordance with the mold. The specifications are expanded to obtain a transparent pet bottle of corresponding height.

Most pets are light, chemically stable, will not rust; good impact resistance; good transparency and wear resistance; good insulation, low thermal conductivity; general formability, good colorability, low processing cost Most pets have poor heat resistance, large thermal expansion rate, easy to burn, poor dimensional stability, and easy deformation; most pets have poor low temperature resistance, become brittle at low temperatures, and are prone to aging; some pets are easily soluble in solvents. Pet can be divided into two types, thermosetting and thermoplastic. The former cannot be reshaped and the latter can be re-produced.

Mineral water pet bottle manufacturers attach great importance to the quality of materials in selecting raw materials. The materials must be non-toxic and odor-free. This is related to the health of users. Therefore, it is of course necessary to be cautious in selecting materials. There is also a requirement for the sealing property and water vapor permeability of the bottle body and the lid. They have a significant impact on the stability of the packaged product.

PET bottles and barrels are not only widely used in packaging carbonated beverages, drinking water, juices and tea beverages. They are widely used in beverage packaging and are widely used in food, chemical, pharmaceutical packaging and many other fields. PET has a wide range of applications in the packaging field. Whether it is packaging film, coil or beer bottle, PET is used. The bottom of the PET bottle has a triangular shape. The word “1” is the PET bottle. PET bottles and barrels are very transparent. PET bottles and barrels have good optical properties and weather resistance. They are non-toxic and stable, but they are not soaked in heat-resistant water. They are not easily deformed when the alkali temperature reaches 70 °C. , oil and other substances.

The pet bottle is easy to carry, not afraid of falling, has acid and alkali resistance, is easy to produce, and is also good for recycling. The main raw material for making beverage bottles is polypropylene pet, which is non-toxic and harmless. It has no adverse effect on the human body when used in soda cola-type beverages. However, since pet bottles still contain a small amount of ethylene monomer, if long-term storage of alcohol, vinegar and other fat-soluble Organic matter, a chemical reaction occurs. Long-term consumption of food contaminated with ethylene can cause dizziness, headache, nausea, loss of appetite, memory loss, etc., and severe cases may also lead to anemia. In addition, the bottle is filled with wine, vinegar, etc., and the bottle is aged by oxygen, ultraviolet rays, etc., releasing more ethylene monomer, so that the wine, vinegar, etc. stored in the bottle for a long time deteriorate and taste.

Jilian Plastic Mould is an experienced manufacturer of diversified pet products. We offer a wide range of products to our customers, from 5-Gallon Pet Preform to caps, handles, etc. We are all Your good choice, so come and leave us a message to open your own path to success.

China Pet Bottle Quality After-sales

There are two processes for forming preforms for Pet Preform: extrusion blow molding and injection blow molding. Stretch blow molding has a one-step method and a two-step method. In the one-step molding, the forming, cooling, heating, stretching and blow molding of the parison and the removal of the bottle are sequentially performed on one machine. The two-step process uses an extruded or injection molded parison and cools the parison to room temperature to become a semi-finished product, which is then reheated and formed into a bottle in a stretch blow molding machine. That is, the forming, stretching and blow molding of the parison are performed on two machines. One-step injection of blow molded PET bottles requires two molds in the injection molding equipment, namely injection molding blank molds and blow molds. The injection molding blank mold is mainly composed of the blank mold cavity and the core rod, and the correctness of the size parameters of each part is the key to whether the bottle body can be formed. Therefore, it is necessary to select the mold parison size parameters in combination with the molding process.

1. The ratio of the height of the PET bottle to the diameter of the neck thread can determine the aspect ratio (L/D) of the parison and the mandrel.

The principle of the length-to-diameter ratio of the mandrel is no more than 10:1. This is because the mandrel is a cantilever beam in the parison mold and is subjected to high injection pressure during filling. When the length-to-diameter ratio is large, the mandrel is bent more, which tends to cause uneven distribution of the parison and the wall thickness. However, the mold filling speed is controlled by the program or the mandrel head is temporarily fixed by the sliding thimble during the filling process to center the mandrel, and the length to diameter ratio of the mandrel may be large. The parison height is obtained by multiplying the height of the reference bottle by the height factor, which is generally 92% to 95% of the height of the bottle. In order to ensure good transparency of the bottle body, after the melt is filled into the parison mold, the temperature should be quickly lowered to below 145 ° C, but higher than the glass transition temperature (82 ° C) of the pet material, and the closer to the glass transition temperature The transparency of the blow molded bottle is higher. The cooling temperature of the parison mold is as low as 10 ° C ~ 35 ° C. In order to quickly cool the parison, the core rod is continuously cooled by liquid or gas, wherein the cold air can make the core rod have a more uniform temperature distribution, and the air pressure is generally At around 1 MPa.

2. Melt temperature at the time of parison injection

Melt temperature is one of the important parameters to be noted for PET preform molding. From the perspective of equipment, the screw design has a great influence on the melting, mixing and melt temperature of PET. For PET injection, a low shear, low compression ratio (about 2/1) screw is used, the feed section is longer, and the transition section and the metering section are shorter. The barrel temperature of the equipment has a great influence on the melt temperature, and increasing the barrel temperature will lower the intrinsic viscosity of the PET melt. The barrel temperature has a significant effect on the transparency of the parison, and increasing the barrel temperature improves the transparency of the parison. For example, when the barrel temperature is 280 ° C, the corresponding melt temperature is 290 ° C, which can ensure the best transparency of the parison. Further increase in barrel temperature does not improve transparency. When the temperature of the barrel is low, the screw speed is appropriately increased to lick the gate temperature, and the transparency of the parison can be improved in a small amount. However, as the melt passes through the hot runner system for a shorter period of time, its temperature improves the transparency of the parison to a lesser extent. When the injection pressure is increased, that is, the injection rate, the melt passes through the nozzle to generate a higher shear heat, which significantly increases the melt temperature, so that the transparent parison can be formed when the temperature of the barrel is low. When the holding pressure is high, the crystallization rate of the melt in the parison mold is lowered, and the transparency of the parison is lowered, especially when the barrel temperature is low. In the actual production process, for a given pet resin and molding equipment, the appropriate melt temperature can be determined by gradually decreasing the temperature until the parison begins to appear hazy, and then raises the temperature to just form a transparent shape. The temperature of the billet becomes the proper melt temperature.

Injectable blown preforms (ie, pet bottle resins) contain acetaldehyde, which makes the packaged drugs, especially liquid drugs, susceptible to chemical reactions. Therefore, the acetaldehyde content of the preform must be controlled, generally less than 10ppm. Reducing the acetaldehyde content of the preform is an important issue in the quality of the pet bottle production process. The acetaldehyde content of the parison is related to the melt temperature and residence time. When the melt temperature is lower than 265 °C, the acetaldehyde content is linear with time; when the melt temperature is higher than 265 °C, the two are exponential. Since the acetaldehyde content in the parison increases linearly with the barrel temperature, the increase in the temperature of the branch pipe and the gate also increases the acetaldehyde content in a small amount, but the increase in the acetaldehyde content when the flow channel temperature is increased is small because of melting. The time that the body passes through the hot runner system is shorter than the time it takes to stay in the barrel. The increase of the screw speed of the equipment at a lower value has no effect on the acetaldehyde content in the parison, but when the rotation speed is further increased, the shear heat generated increases the melt temperature and increases the acetaldehyde content. Increasing the back pressure will increase the melt temperature and thus increase the acetaldehyde content, so the back pressure should be reduced as much as possible while ensuring uniform plasticization of the pet material. The melt temperature is increased when the injection pressure is increased, but the time for the melt to pass through the nozzle is short, so that the acetaldehyde content is only slightly increased, and the holding pressure and the parison mold temperature have no effect on the acetaldehyde content.

It can be seen that the barrel temperature has a significant effect on the acetaldehyde content of the pet parison, and the screw speed, injection rate, back pressure and hot runner temperature have little effect on the acetaldehyde content. Therefore, by increasing the injection rate and lowering the barrel temperature, it is possible to form a parison having a high transparency and a low acetaldehyde content. High injection pressure is used during the initial period of filling to stabilize the filling process, and then injection at low pressure can achieve better results. Therefore, when forming a pet parison, the melt temperature should be selected to ensure the transparency of the parison and at the same time control the production of acetaldehyde. The melt temperature is generally about 280 °C.

3. The value of the blow ratio of the injection molding parison and the bottle body

When injection molding a small volume pet bottle, the parison mainly undergoes axial stretching during the molding process. The smaller the axial stretch, the larger the inflation ratio (the ratio of the diameter of the bottle to the diameter of the parison), and the greater the possibility of uneven wall thickness distribution, which may cause the shoulder and the bottle or bottle and bottle. The wall thickness of the curved portion of the bottom transition region is not uniform. The small volume bottle inflation ratio is generally between 1.5 and 1.8. For a bottle body having an elliptical cross section, if the ratio of the ellipse ratio, that is, the length of the ellipse length axis, is less than 1.5:1, a parison having a circular cross section may be used. When the ellipse ratio is not more than 2:1, a mandrel having a circular cross section and an elliptical parison may be used. When the elliptic ratio is greater than 2:1, it is generally required that the mandrel and the parison cavity are designed to be elliptical. As the elliptic ratio increases, the design difficulty and manufacturing cost of the parison mold are improved, and generally should not exceed 3:1.

4, injection molding blank mouth and neck size

The diameter of the parison mouth and the thread size shall be uniform with the thread size of the bottle and match the thread size of the cap. Since there is no uniform national standard for this, the size of the mouth of the bottle is determined according to the contents of the bottle. When determining the neck size of the parison and the cavity size of the blow mold, the shrinkage of the bottle after molding should also be considered. The inflation pressure of the PET bottle in the parison is 1.2 MPa, and the cooling water is cooled by 5 to 10 ° C. The mold allows the parison to be inflated for rapid cooling.

5, the function of the bottle injection molding core rod

The function of the mandrel used in injection blow molding has five main aspects: (1) determining the shape of the formed parison and the inner diameter of the neck of the bottle (2) taking away the parison or bottle during the mechanical indexing; 3) The air tube is provided with air passage and air inlet and outlet, and compressed air is supplied to inflate the parison; (4) the inside of the core rod can pass circulating liquid or air to adjust the parison temperature; (5) the tail of the mandrel is close to fit A groove with a depth of 0.10 mm is opened to wedge the end of the parison into the groove to avoid misalignment of the neck thread due to its elastic contraction during the process from the parison forming station to the blowing station. The groove acts as a seal to reduce leakage of compressed air during inflation.

6, the selection of the length and diameter of the mandrel

The length and diameter of the mandrel are mainly determined by the parison. The diameter of the mandrel is smaller than the inner diameter of the neck of the bottle to facilitate the demolding of the bottle. However, the diameter of the mandrel should be as large as possible within the inner diameter of the neck to avoid excessive blow ratio. The mandrel coaxiality should be within 0.05 to 0.08 mm in diameter. The diameter of the core rod of the bottle mouth is determined by the outer diameter of the bottle mouth and the thickness of the bottle mouth. The value range is generally that the diameter of the bottle mouth is equal to the outer diameter of the bottle mouth minus twice the wall thickness of the bottle mouth.

7. Determination of the distance between the bottom of the mandrel and the bottom of the parison

The distance dimension is the thickness of the bottom of the parison, and its size is reasonable or not, which directly affects whether the thickness of the bottom of the bottle meets the requirements. The general calculation method is: the thickness of the bottom of the parison (B) is equal to the minimum thickness (T) of the bottom of the bottle plus 0.1 times the weight of the bottle. The material selected for the core rod is alloy tool steel with a hardness of HRC 52-54, which is slightly lower than the hardness of the mold collar. The surface of the mandrel in contact with the melt is polished in the direction of the melt flow and hard chrome plated to facilitate melt filling and demolding of the parison. At the blow molding and demolding station of the PET bottle, the gas continues to circulate inside the mandrel to ensure a more uniform temperature distribution of the mandrel. The temperature values ​​of the various sections of the mandrel are: 45 ° C to 55 ° C for the head (corresponding to the neck of the parison), 40 ° C to 50 ° C for the middle portion (corresponding to the blank body), and 23 ° C to 35 ° C for the tail portion. At the parison injection station, the temperature of the mandrel is at the upper limit of the above range due to the high melt temperature, and the temperature at which the mandrel is transferred to the demolding station is lowered to the lower limit due to internal cooling. After the bottle is removed from the demolding station, the mandrel head is air cooled from the outside to lower the temperature of the mandrel.

8, PET bottle injection blow molding process parameters take values

PET bottles are controlled for melt temperature during injection blow molding to a temperature in the range of 275 ° C to 285 ° C, which is about 50 ° C higher than the temperature of most injection blow molding grade polymers. The hot runner system should be streamlined and symmetrical to avoid dead angles. The nozzle has a lock-up structure and the outer surface is heated. In order to ensure high transparency of the parison, the melt should be rapidly cooled to below 145 °C after being filled into the parison mold, but higher than the glass transition temperature (82 °C), and the closer to the glass transition temperature, the blow molding bottle The higher the transparency, the wider the processing range. The parison mold cooling water temperature is as low as 10 ° C ~ 35 ° C to quickly cool the parison. The mandrel is also continuously cooled internally by liquid or gas. Among them, air cooling can make the core rod have a more uniform temperature distribution in the axial direction, and there is no leakage problem. The internal cooling pressure of the mandrel is generally 1 MPa. Preferably, the liquid and gas combination cooling method is adopted, and the inflation pressure of the PET parison is about 1.2 MPa. The cooling water used has a temperature of 5 ° C to 10 ° C. In order to cool the blow mold, the parison is also inflated to obtain rapid cooling.

Jilian Plastic Mould is an experienced China Pet Bottle manufacturing supplier. With our rich experience and excellent after-sales service, we believe that we can satisfy all customers, so what are you still hesitating? If you are excited, please come and leave us a message. We are always looking forward to your message.