Blow Moulding

Your Professional Blow Moulding manufacturer

HANKE has been working for over 10 years in the field of "PET PACKAGING", Since its establishment, it has been focusing on the design of PET bottle shapes, preforms, and bottle caps and the development and manufacture of corresponding molds. We have extensive experience in the production of molds and equipment for preform and bottle production for our customers.

Wide Range of Applications

Widely used in beverages, food, edible oil, condiments, candy, cosmetics, detergents, medical supplies, and other fields.

Wide Range of Cooperative Countries

We have a full understanding of the export standards, transportation conditions, and requirements of the cooperative countries.

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Quality Assurance

There is very strict analysis and quality control from the 3D drawing of the mold to the first tryout of the mold.

24H Online Service 

Our customer service representatives are available 24/7 to assist you with any inquiries, technical issues, or after-sales services.

 

 

What Is Blow Moulding?

Blow moulding is a manufacturing process used to produce hollow plastic parts. It involves melting plastic resin and then injecting it into a mold, where it is shaped by blowing compressed air into the molten plastic. The air pressure expands the plastic and conforms it to the shape of the mold, creating a hollow object with a desired design. 

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Advantages of Blow Moulding
 

It Can Produce a Variety of Products

Most plastic containers on the market today that hold some form of liquid have gone through this process. The commonness of blow molding has allowed engineers to try and create a variety of applications and designs, which resulted in multiple interesting uses. 

 

Blow Molding is Relatively Inexpensive

Cost is a big factor in any manufacturing, especially a large-scale, industrial plastic manufacturing job. Blow molding is typically quite inexpensive compared to other fabrication methods.

 

It Allows For Multiple Methods of Production

Extrusion blow molding works similarly to traditional glass blowing, where materials are blown through a long tube to work on the end, which can create products, such as light bulbs. As for injection blow molding, it is employed to produce receptacles in huge quantities.

 

It Promotes a Higher Level of Productivity

This technology has always been moving forward to become universally used in plastic production. It has allowed for a significant increase in production capabilities, and the ability to produce more products in a short time.

 

Various Material Options

Blow molding also provides a wide range of resins and colors to choose from high-density and low-density polyethylene (HDPE and LDPE) to polypropylene (PP) to engineering resins such as K-Resin, PETG, and Polycarbonate.

 

Blow Molding is Fast

Blow molding is also a relatively fast manufacturing solution. Professional grade injection or extrusion blow molding machinery is capable of producing huge quantities of finished plastic products and can run for a virtually indefinite amount of time.

 

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Blow Moulding: Everything You Need to Know!

The blow moulding process begins with softening plastic by heating a preform or parison. The parison is a tube-like piece of plastic with a hole in one end through which compressed air can enter.

The plastic workpiece is then clamped into a mold and air is blown into it. The air pressure inflates the plastic which conforms to the mold. Once the plastic has cooled and hardened the mold opens and the part is ejected. Water channels within the mold assist in cooling.

 

Types of Blow Moulding Processes

 

 

Injection Blow Moulding

In injection blow molding, a blow or core rod is used throughout the process. First, a parison is injected into a split mold cavity around the rod. The parison that is formed looks similar to a test tube. The core rod transfers the parison to the blow mold machine where forced air creates the final shape. The rod then transfers and extrudes the finished product from the machine.

 

Extrusion Blow Moulding

Extrusion blow molding can be continuous or intermittent. In continuous extrusion blow molding, a parison will be constantly fed into the mold and each form will be cut off with a blade as it forms. Intermittent extrusion blow molding expels each new plastic from the metal mold when it is cooled and the parison is fed into the mold only after the preceding parison is expelled.

 

Injection Stretch Blow Moulding

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

 

 

How To Cooperate With Us

 

 

Initial Contact: Begin by reaching out to our company through phone, email, or our website. Provide us with information about your specific blow moulding needs, including the type of product, quantity, and any specific requirements.

 

Detailed Discussion: We will have a detailed discussion with you to understand your expectations, specifications, and any customization needs. This step ensures that both parties are aligned on all aspects of the project.

 

Proposal: Based on the information gathered, we will prepare a comprehensive proposal that outlines the project scope, pricing, production timeline, and payment terms. We will also provide any necessary technical documentation or samples for your review.

 

Agreement and Contract: If the proposal meets your requirements, we will proceed with finalizing the agreement and contract. This document will detail the terms and conditions of the cooperation, including responsibilities, confidentiality, and intellectual property rights.

 

Production and Quality Control: Once the contract is signed, our experienced engineers and technicians will commence the production process according to the agreed-upon specifications. Throughout the production cycle, we maintain rigorous quality control measures to ensure the final product meets your standards.

 

Communication and Feedback: We value open communication throughout the cooperation process. We will provide regular updates on the progress of your project and promptly address any concerns or questions you may have. Your feedback is highly appreciated, and we will make the necessary adjustments to ensure your satisfaction.

 

Packaging and Shipment: Upon completion of production, we will carefully package your blow moulded products to ensure they arrive in optimal condition. We have experience in arranging efficient and reliable shipping methods to deliver the goods to your designated location.

 

After-sales Support: Our commitment to customer satisfaction extends beyond the delivery of the products. We offer post-sales support and assistance for any operational or technical inquiries you may have.

 

Contact now

 

 

Taizhou Hanke Mould Co., Ltd

 

 

FAQ

Q: What is the process of blow moulding?

A: Blow molding is the forming of a hollow object by inflating or blowing a thermoplastic molten tube called a “parison” in the shape of a mold cavity. The process consists of extruding or “dropping” a parison on which female mold halves are closed. The female mold halves contain the shape of the product to be produced.

Q: Why is blow moulding used?

A: Injection blow moulding is used for the Production of hollow objects in large quantities. The main applications are bottles, jars and other containers. The Injection blow moulding process produces bottles of superior visual and dimensional quality compared to extrusion blow moulding.

Q: What are the 4 stages of blow molding?

A: Injecting of molten raw materials into the preform mold by the injection machine. Cooling of molten PET preform to room temperature. Processing of preform by a finishing machine. Transferring of the preform to reheating stretch blow molding machines.

Q: What materials are used in blow molding?

A: In addition to HDPE blow molding, some of our most commonly recommended and requested materials and finishes include: Polypropylene (PP) Polyethylene (HDPE, MDPE, LDPE) Nylon (PA).

Q: What is the difference between blow molding and rotational molding?

A: Rotational molding requires thicker walls and uses more material, but supports parts that are larger, heavier, and more complex. Blow molding is a better choice for parts that are simpler, lighter, and have thinner walls. In terms of materials, polyethylene (PE) is the most commonly used plastic in rotational molding.

Q: What gas is used in blow molding?

A: Liquid nitrogen can also be used in the blow molding process instead of cooled air to help increase quality and productivity in the process. In some cases, liquid carbon dioxide can be used for temperature control and cooling hot spots in the molding process.

Q: What is the difference between blow moulding and injection?

A: Injection molding is used for complex solid components whereas blow molding is used for thin-walled hollow parts. Injection molding forces plastic into a mold under high pressure. Blow molding, on the other hand, expands a hollow tube of plastic into a mold using compressed air.

Q: Why is HDPE used for blow moulding?

A: HDPE has incredible toughness, allowing you to mold and transform the resin into a variety of designs. That toughness also helps protect products made with HDPE, which won't shatter - or even suffer any noticeable damage - when dropped to the ground.

Q: Is blow moulding extrusion?

A: Plastics Processing Extrusion blow molding is recognizable by the hollow tube that is extruded from the machine to create the parts. This tube is referred to as a parison. A hollow mold then closes around the parison and cycles to the blow station.

Q: Can PVC be blow molded?

A: Yes, PVC (Polyvinyl chloride) can be blow molded. PVC is a thermoplastic material that can be heated and shaped into various forms, including blow molded products. The blow molding process for PVC involves heating the material to a molten state, extruding it into a parison (hollow tube), and then inflating the parison using compressed air inside a mold to create the desired shape. PVC is commonly used in blow molding applications for products such as bottles, containers, tanks, and other hollow plastic parts.

Q: Why stretch blow molding?

A: Increased Barrier Properties-Because stretch blow molding machines pull bottles and containers in both a hoop and axial direction, the barrier properties increase. At the same time, that process enhances clarity, tolerable drop impact, and top load. Ultimately, you end up with a superior-quality finished product.

Q: Is blow molding thermoforming?

A: No, blow molding is not the same as thermoforming. Although both processes are used to shape plastics, they are distinct techniques with different principles and applications. Blow molding is a process used to manufacture hollow plastic parts, such as bottles, containers, and tanks. It involves melting plastic resin and extruding it into a parison (hollow tube). The parison is then placed inside a mold, and compressed air is used to inflate the parison, forcing it against the walls of the mold and taking its shape. Thermoforming, on the other hand, is a process used to shape flat plastic sheets into three-dimensional forms. In thermoforming, a plastic sheet is heated until it becomes pliable and then placed over a mold or frame. Vacuum pressure or mechanical force is applied to draw the heated sheet into the desired shape against the mold. While both blow molding and thermoforming involve shaping plastics, the key difference lies in the starting material and the method of forming. Blow molding uses a molten resin that is extruded into a parison and inflated, while thermoforming uses pre-formed plastic sheets that are heated and shaped over a mold.

Q: What is compression blow molding?

A: CBF (Compression Blow Forming) is a unique combination of compression molding and blow molding. The process begins with the resin being introduced into a continuously operating extruder.

Q: What is the blow ratio for blow molding?

A: Generally, the blow-up ratio is 2-4 times, and 1:2 is more suitable, and the wall thickness is more uniform at this time. Mold temperature and cooling time The higher the melting temperature of the material, allows higher mold temperatures.

Q: What is the difference between extrusion blow molding and stretch blow molding?

A: Injection and stretch blow molding are often used to create water bottles, cosmetic containers, and other small hollow parts. Extrusion blow molding is used to create medium to large hollow parts with complex geometries or highly technical requirements such as DEF tanks, HVAC ducts, and lawn mower seats.

Q: What is the principle of stretch blow moulding?

A: Compressed air is injected into the preform via the blow stem while the blow stem is pushed forward to stretch the preform further into the mold.

Q: What is two-stage stretch blow molding also known as?

A: As this method involves two processing steps in the Injection Machine and Stretch Blow Molding Machine, it is known as the “Two-Stage Method”. In addition, as the preform is re-heated and stretches blown after cooling, it is also known as the “Cold Preform Method”.

Q: Why is blow moulding suitable for mass production?

A: Blow molding is suitable for mass production due to its high production rates, cost-effective tooling, material efficiency, design versatility, and automation potential. The process allows for the production of a large number of parts in a short amount of time, with less expensive tooling compared to other processes. It also enables material savings by producing hollow parts with thin walls. Blow molding’s design flexibility allows for complex shapes and custom features. Additionally, the process can be easily automated, reducing labor costs and increasing production efficiency. Overall, these factors make blow molding an ideal choice for cost-effective and efficient mass production of plastic parts.

Q: How sustainable is blow Moulding?

A: Blow molding uses a large quantity of compressed air, which requires a lot of energy. Recycling this air can reduce energy use by up 40%, resulting in big financial savings.

Q: Is blow moulding Labour-intensive?

A: Blow molding can be labor-intensive to some extent, depending on the specific production setup. While the process itself can be automated, certain tasks may still require human intervention. For example, operators may be needed to set up and monitor the machines, perform quality control checks, trim excess material, and handle any manual assembly or packaging processes.

 

We're professional blow moulding manufacturers and suppliers in China, specialized in providing high quality customized products. We warmly welcome you to wholesale high-grade blow moulding for sale here from our factory. For price consultation, contact us. 4 Cavity Pet Preform Mould, 72- Cavity Preform Injection Molding, Automatic Bottle Blowing Machine

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