preform nicole's blog
July 3, 2019 by preform nicole
The chemical name of PET is polyethylene terephthalate, also known as polyester. Currently, GF-PET is the most used among customers and is mainly used to produce Pet Bottle Preform.
The rheology of PET in the molten state is good, and the effect of pressure on viscosity is greater than temperature. Therefore, the fluidity of the melt is mainly changed by the pressure.
Since PET macromolecules contain lipid groups and have a certain hydrophilicity, the particles are sensitive to water at high temperatures. When the moisture content exceeds the limit, the molecular weight of PET decreases during processing and the product is colored and brittle. In this case, the material must be dried prior to processing at a drying temperature of 150 ° C for more than 4 hours, typically 170 ° C for 4-6 hours. The air injection method can be used to verify that the material is completely dry.
The proportion of recycled materials should generally not exceed 25%, and the recycled materials should be thoroughly dried.
Injection molding machine selection
Since PET has a short settling time and a high melting point after melting point, it is necessary to use an injection system with more temperature control parts and less self-friction heat during plasticization, and the actual weight of the product (aqueous gate material) It can't be less than 2/3 of the injection molding volume of the injection molding machine.
Pet bottle mold and gate design
PET preforms are typically formed from hot runner molds. It is preferable to have a heat shield between the pet bottle mold and the template of the injection molding machine. The thickness of the plate is approximately 12 mm and the hot plate must withstand high pressure. The exhaust gas must be sufficient to avoid local overheating or chipping, but the depth of the exhaust port should not exceed 0.03 mm, otherwise flashing is likely to occur.
It can be measured by the air-to-air method. Between 270 and 295 ° C for the production of PET preforms, the reinforced grade GF-PET can be set at 290-315 ° C.
Generally, the injection speed needs to be fast, which prevents premature coagulation during the injection. But at too fast, high shear rates can make the material brittle. Injections are typically completed within 4 seconds to produce PET preforms.
The lower the better, to avoid wear. Generally no more than 100bar. Back pressure is usually not required to produce PET preforms.
Do not use excessive residence times 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 with a viscosity PE and lower the barrel temperature to PE temperature until it is turned back on.
(1) Recycled materials should not be too much, otherwise it will easily cause “bridge” during punching and affect plasticization.
(2) If the pet bottle mold temperature is not well controlled or the material temperature is not properly controlled, it is easy to produce "white fog" and is opaque. The Pet Bottle Mould has a low and uniform temperature, a fast cooling rate, less crystallization, and a transparent product.
June 27, 2019 by preform nicole
Hollow blow molding is a tubular thermoplastic plastic blank extruded from an extruder and still in a softened state, placed in a Pet Preform Mould, and then compressed air is introduced to deform the blank along the cavity by the pressure of the air. Thus, it is blown into a hollow product having a short neck opening.
Hollow blow molding has been widely used to produce a variety of thin shell hollow products, chemical and daily packaging containers, as well as children's toys.
Hollow blow molding (also known as blow molding) is a method of inflating a hot-melt shaped embryo closed in a mold by means of gas pressure to form a hollow product, and is the third most commonly used plastic processing method, and is also developing rapidly. A plastic molding method.
The mold for blow molding has only a female mold (female mold), which is lower in cost and more adaptable than injection molding, and has good formability (such as low stress) to form a product having a complicated undulating curve (shape).
Blow-on plastics include: polyolefins, engineering plastics and elastomers; blow molding applications involve automotive, office equipment, household appliances, medical, etc.; can produce 60,000 bottles per hour and can also manufacture large blow moldings. (The weight of the piece is up to 180kg) The multi-layer blow molding technology has been greatly developed; the blow molding equipment has adopted the closed-loop control system of microcomputer and solid-state electronics, and the computer CAE/CAM technology is also becoming more and more mature; and the blow molding machinery is more specialized and more Unique.
Jilian Plastic Mould is an experienced Pet Preform Manufacturers that integrates product design and development. After years of exploration and development, we now have a large number of experienced professional and technical personnel and advanced equipment. We rely on continuous innovation and improvement to occupy an increasing market share in the market. We also welcome more customers' messages. And consulting.
June 18, 2019 by preform nicole
Commonly used are people's daily necessities such as: bottles, cans, baby products, sporting goods, etc., blow molding products molding defects will appear product pitting, raw materials are not dry enough, Pet Preform Mould temperature is too high or too low; product deformation , heat preservation, holding time is too short, local pet preform mold overheating; product wall thickness and weight is not easy to master, matching caliber adjustment.
There are bright lines on the surface of the product, the local temperature is too high; a small amount of oil is mixed; the die is not cleaned; the wires and papers in the die are chores;
If the blow molding product has poor impact resistance, it may be because the material temperature is too low; the wall thickness of the product is uneven; the toughness of the raw material is not enough; the wall thickness of the product is too thin.
What should I do when the blow molding product is deformed?
1. Insulation, holding time is too short; 2. The product is difficult to demould, forced out; 3. Product placement is not standardized; 4. Product is not stereotyped; 5. Product accumulation is too high; 6. Local mold overheating; The air pressure of the high pressure blowing is too low. 8. The high pressure blowing time is too short.
Choosing a reliable Pet Preform Manufacturers can help you avoid the above problems. Jilian mold is your good choice. We are experts in this field. I believe we will never let you down.
May 31, 2019 by preform nicole
Pet Preform Mould have some problems when they are produced. There may be pitting on the surface, which will affect the product's effect. How can we avoid this?
This may be caused by poor mold venting or water leakage from the mold or condensation in the mold cavity. It is also possible that the parison is poorly plasticized, the parison has a melt fracture phenomenon, the inflation pressure is insufficient, and the inflation speed is slow. Of course, we can blast the mold blanks and add vent holes. Repair the mold, adjust the mold cooling temperature, reduce the screw speed, increase the extruder heating temperature, etc.
This reminds the Pet Preform Manufacturers to check the normal use of the mold during production. Once the wear or damage is found, it should be solved immediately. Don't wait until the production.
May 29, 2019 by preform nicole
Pet Preform Mould are widely used in life, and we are very fond of its use, so what are the advantages of pet preform molds when they are used?
In our daily life, the use of PET bottles can be seen everywhere. Its raw material selection is tested and approved by the national quality certification body. From the material point of view, PET bottles are mainly made of PET, and the PET bottles produced are the most prominent. It is characterized by light weight and is not afraid of falling. Therefore, PET bottles are widely used in various fields due to their unique competitive advantages. Whether it is material, bottle shape, appearance, it can meet the market demand. Of course, it should be used correctly when using it, to avoid problems, etc.
The correct use of it is to choose the appropriate method according to the different materials, because there are many materials that are disposable, can not be used for a long time can not be heated, etc., only then we can ensure its correct use, to avoid safety problems.
Choosing a guaranteed Pet Preform Manufacturers will bring you a quality-assured product. Jilian Plastic is a choice you can't miss.
May 27, 2019 by preform nicole
PET bottles were first industrially produced since 1947, and prices were relatively expensive until the 1963s. As the advantages of PET become more and more obvious, pet preform molds quickly become one of the most popular packaging containers on the most popular scale. How to choose a reliable Pet Preform Manufacturers has become a very concerned issue for food manufacturers. When choosing a pet preform manufacturer, in addition to seeing whether or not to obtain a QS certificate, as well as ISO9001 certification and the quality of corporate cooperation customers, today we are explaining the other points that need attention.
The third key point is whether the manufacturer chooses high-quality pet food-grade raw materials, and the raw materials undoubtedly account for the cost of the product. Therefore, some plastic bottle manufacturers use recycled plastic or inferior pet raw materials in order to reduce product costs and increase profits.
Unqualified pet raw materials Heavy metals and acetaldehyde content exceed the standard, affecting the quality of products directly contaminate the food contact, bringing food safety hazards to food production enterprises. It is very difficult to ignore the price of raw materials and ignore the quality of raw materials. The new high-quality pet raw materials are more in line with the needs of food manufacturers than the inferior pet raw materials and recycled pet plastics in terms of performance and packaging hygiene. If you have the needs of Pet Preform Mould, then Jilian mold will be your good choice. If you are excited, please leave a message.
May 24, 2019 by preform nicole
Jilian Plastic Mould is a Pet Preform Manufacturers specializing in the production of PET bottles, PET products and PET daily packaging products. It mainly produces PET bottles, PET bottles for daily use, PET bottles for food, PET bottles for PET and PET bottles for chemical PET bottles. product. Provide customers with PET bottle packaging design and production one-stop service.
The company now has a group of professional technical team and quality management team. It has a wide range of production conditions from PET bottle product development and design to the use of PET bottle materials and rigorous production conditions in all aspects of PET bottle products before they go on the market. A manufacturer that customers love and favor.
Jilian Plastic Molding Co., Ltd. has the experience of professionally manufacturing Pet Preform Mould, focusing on the brand's services, tailored according to the needs of customers, and suitable for the PET bottle packaging of its brand development. We warmly welcome domestic and foreign merchants to visit and guide our company. Our company will cooperate with you sincerely with "first-class quality, first-class reputation and first-class service" and develop together!
May 22, 2019 by preform nicole
The first stage of bottle manufacturing is stretch blow molding. The polyester is heated and placed in a Pet Preform Mould in which the polyester assumes the shape of a slender tube. (The process by which PET is pressed into the mold is called injection molding.) The polyester tube, now called the parison, 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 into the mold due to compressed air, heat and pressure, Presents the shape of the bottle. In order to ensure a consistent flat shape of the bottom of the bottle, the individual components of the PET are simultaneously attached to the bottle during the blow molding process.
The mold must be cooled relatively quickly so that the newly formed part is properly set. There are several direct and indirect cooling methods that effectively cool the mold and PET. Water can flow through the pipes around the mold, indirectly cooling the mold and PET. Direct methods include the use of compressed air or carbon dioxide directly on the mold and PET.
Once the bottle (or, in continuous production, the bottle) is cooled and solidified, it can be removed from the mold. If a continuous molding process is used, the bottles need to be separated by trimming the PET between them. If a non-continuous process is used, sometimes excess PET will penetrate the mold during the manufacturing process and needs to be trimmed. After the bottle is removed from the mold and the excess PET is removed, the bottle can be transported.
We choose Gianlian Mould, we are a very reliable and reliable Pet Preform Manufacturers, we believe that with our comprehensive help, you can also get a satisfactory product and enjoy our comprehensive service.
May 20, 2019 by preform nicole
The application of Pet Preform Mould is relatively high in the packaging of food, because it is odorless and belongs to a kind of material. Food as an entrance, food, as a mass consumer, is to pay attention to its quality problems, food in the air to prevent too long, it will cause deterioration, and wrapped with PET preform material, can start To the role of protection, because PET can block ultraviolet light, has the ability to block water, oil, air, etc., in general, its permeability to gas and water vapor is relatively low.
Moreover, its physical role is relatively stable, with oil and corrosion resistance, folding resistance is also very good, high temperature resistance is strong, so these have laid a material for food protection, PET can not only be used for food Packaging, also used as a material for PET preforms, this principle is the same as food, with excellent conditions such as high temperature resistance, UV resistance, and air isolation, making it an important part of processing. Because of these properties, we can completely rest assured that the PET preform is completely harmless to our health, and there is no need to worry about the deterioration of the product due to high temperature.
Welcome to contact Jilian Plastic Mould, we are a professional Pet Preform Manufacturers, can bring you safe and secure pet products, no matter what your needs, just come to us to leave a message, we can To provide you with the perfect solution.
May 16, 2019 by preform nicole
We all know that when the pet bottle appeared, it was widely recognized and used in various industries. Whether it was in industry, manufacturing, technology or food, slowly over the past few years, everyone’s products for PET materials broke out. As a matter of doubt, the Pet Preform Mould market is slowly being impacted by other materials.
Especially for food packaging, there are many forms and materials, pet, glass, carton, canned food, packaging bags, etc.; the variety of various packaging forms greatly meet the food needs for packaging; The demand for pet bottles is naturally less. Now, no matter what kind of packaging, as long as the cost is low, the style is exquisite, and the food packaging that is favored by ordinary consumers can obtain lasting vitality in the market.
The pet bottle needs to be upgraded again, and it needs to be upgraded to solve its own shortcomings. It is recognized by everyone, and it has a certain weight in the market. It is not difficult to get a new favorite.
For fierce market competition, Pet Preform Manufacturers can only maintain market competitiveness in the future with continuous improvement and improvement.