Wednesday, April 17, 2024

What Is Blow Molded Plastic

Advantages Of Custom Blow Molding

Blow molding process

Compared to other plastic manufacturing processes, blow molding has many advantages, including:

  • Suitability for automation. The blow molding process readily accommodates automation, allowing manufacturers to create accurate components in higher volumes at faster speeds.
  • Cost-effectiveness. The blow molding process requires less pressure than other manufacturing methods, which helps reduces production costs. Additionally, the inherent recyclability of the base material and faster cycles of the process result in lower material utilization and shorter production times, which translates to overall decreased production costs.
  • Capacity for mass production. Manufacturers can produce hundreds or thousands of blow molded units within a short period. This quality makes the process relatively inexpensive compared to other molding methods, making it more customizable and scalable.
  • Manufacturing flexibility. Blow molding can be used to produce a variety of hollow components in prototype to production volumes depending on the needs of the customer.

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Injection Molding Vs Blow Molding

Injection molding, as opposed to blow Moulding, involves melting plastic and compressing it into a mold. When the plastic cools, it takes on the form of mold.

Injection molding forms a concrete course, while blow moulding forms an entrance path that can then be filled with liquid. Injection molding produces solid plastic, while blow molding produces hollow containers such as bottles and milk jugs.

Since a bucket does not have a small entry point, it is created by injection molding, while a milk jar must be blow-shaped to form the shape to build the small entry point for filling it with liquid.

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Utah Plastic Blow Molding

What is Blow Molding?

If you have ever wondered how bottles are made, look no further than Streamline Plastics Utah blow molding. Blow molding is a molding process that uses hot plastic, exterior molds and air to inflate heated polymers. Although elementary blow molds can be made in an amateur shop, more sophisticated machinery is required for products that will be sold in the marketplace.

Different Methods for Blow Molding Plastics

There are three main methods for blow molding plastic in a manufactory setting:

  • Extrusion blow molding. This method involves injecting melted plastic into a hollow tube, which is then enclosed in a cold metal mold. Air is blown into the middle of the hollow tube, shaping the bottle or container. Then the hollow tube is discarded after the bottle has been removed from the mold.
  • Injection blow molding. This process is more practical for a lower level of production, making it useful for small medical or single-serve bottles. There are three steps to this blow molding method, which are injection, blowing and ejection. The first step occurs when the melted polymer is injected into a hollow preform mold that has been heated. The core rod is inserted into the blow mold where the second step takes place. After the plastic is blown into shape, the mold is removed and the container is taken off of the core rod.
  • Most finished products have leftover bits of plastic attached, which requires spin trimming to make sure that the product is in working order.

    What Kinds Of Things Would You Make With The Blow Molding Process

    Best Machines to Make Blow Molding Products

    The plastic blow molding process has a significant advantage in that it can produce a wide variety of products. Plastic blow molded products can be used in all fields of domestic and commercial life, from plastic food containers and shampoo bottles and barrels to vehicle ducting and manufacturing tubs and drums.

    Blow molding materials are widely used to manufacture items for the automobile industry, such as vehicle fluid storing bins, cooling system parts, and fuel tanks, in addition to the food and beverage packaging market.

    The technique is used in the medical industry for spray water bottles and storage tanks to sanitize products and medications, and also household appliances, including reservoirs inside washing machines and dishwashers, incorporate blow molding materials.

    Finally, plastic blow molding is responsible for developing many children’s toys, such as plastic blocks, dolls, and balls. Large industrial products, such as plastic tubs and containers, holding tanks, and barrels for transporting liquids, are also manufactured using the technique.

    Applications of Blow Molding Process:

    • Water Bottles
    • Thickness and too much flanging of components
    • Deep vertical stripes
    • Volume reduction of blow molding components
    • high fluctuations will be seen in the quality of Blow Molding Components.
    • Wall thickness is non-uniform.

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    Types Of Blow Molding Methods

    There are currently three primary methods for producing blow-molded products. Each approach has its own set of advantages and drawbacks, and it is up to manufacturers to choose the method that best meets their needs. These methods are:

  • Extrusion blow molding – This is the safest method for producing complicated product shapes. Plastic is melted and then extruded into a hollow tube, also known as a parison, during this process. After closing the parison, the desired form is obtained by blowing air into the warm plastic. The piece is ejected after it has cooled. Continuous or intermittent extrusion blow molding is possible.
  • Injection blow molding – Plastic or polymer is inserted into a core pin during this process, and the blow molding machine rotates the pin until the plastic is inflated into the correct form. After that, it is cooled and expelled in a single step. This approach is less used than the other two because it is more time-intensive.
  • Injection stretch blow molding – Injection stretch blow molding is a variant on injection blow molding, but it uses less material. Plastic is molded into a solid pre-form during stretch blow molding. This preform is heated and fed into a stretch blow mold machine. After being heated, the object is blown into a plastic container of compressed air. This method is widely used to make soft drink bottles.
  • The Different Types Of Blow Molding

    There are several different types of blow molding, one of which is extrusion. Known as extrusion blow molding , it lives up to its namesake by extruding heated plastic into a parison. Its a common molding process used in the manufacturing industry because of its ability to mass-produce a large volume of objects in the same size and shape.

    Another common type of blow molding process is injection stretch blow molding. Using either one or two stages, injection stretch blow molding is typically used to create plastic bottles. Its specifically effective for creating preforms of plastic bottles, which are then either sold to bottling companies or used to manufacture a bottle.

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    Contact The Plastic Molding Experts At Plastic Design Today

    Both blow molding and injection molding play a critical role in the manufacture of a wide range of plastic parts and products. If youre looking for an injection molding partner for your next project, turn to the experts at Plastic Design today.

    At Plastic Design International, Inc., weve provided custom plastic injection molding solutions for over 40 years. We utilize state-of-the-art technology, including automated conveyors, robotic sprue pickers, and CMM equipment, and maintain ISO certification to ensure the molded products we deliver fully meet our customers specifications and standards.

    To learn more about our injection molding capabilities or discuss your project requirements with one of our representatives, contact us or request a quote today.

    What Is Blow Molding & How It Works

    Plastic Blow Molding

    We see plastic bottles, containers, and jars everywhere. We use them now and then. But have you come across how these shapes are formed? It is because of blow molding. Blow molding is the industrial manufacturing process for making hollow plastic parts. You can use the same process or joining the hollow plastic parts.

    The idea behind plastic blow molding comes from glass blow molding. The worker heats the glass to boiling point and then blows air through a hollow tube to inflate the molten glass. Back in those days, the process was very cumbersome and not at all suitable for mass production.

    Furthermore, the process evolved, and in the 1930s, commercial machines for mass production were available. As time went by, the invention of high and low-density polyethylene changed the molding industry altogether.

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    What Is The Blow Molding Process In The Plastic Industry

    Blow molding is a type of manufacturing and production process that allows for the forming of hollow plastic parts. Air pressure is traditionally used to inflate a soft plastic into the mold cavity. While this technology originally derived from the glass industry, the blow molding process in the plastic sector competes in the recyclable and disposable market.

    There are three main types of blow molding techniques: extrusion, injection stretch, and injection blow molding. The blow molding process can construct jars and containers such as PETE and PET containers and jars for packaging.

    Blow molding is a critical industrial process for manufacturing any type of one-piece hollow plastic parts such as plastic piping, water cans, containers and bottles.

    Blow Molding Capabilities At Lerner Molded Plastics

    Our plastic manufacturing facility houses single-head and dual-head blow molding units and shuttle press systems. This equipment allows us to accommodate up to 40-pound head capacity and high-volume production needs. We can produce small to large parts with varying intricacies and number of cavities in prototype to full production quantities.

    Our material capabilities include:

    In addition to our blow molding capabilities, we offer a broad selection of secondary services, including in-line and post-molding assembly, ultrasonic welding, and part decoration. We also provide complete supply chain services, such as sourcing, warehousing, inventory control, Kanban, logistical support, and packaging.

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    How Does The Blow Molding Process Work

    The plastic blow molding manufacturing process is made up of two parts. The first part of this process begins with the creation of Parisons, or starting tubes of molten plastic. These Parisons are the base for extrusion blowing, regardless of the type of container or plastic part that is being manufactured. When the Parisons have been fabricated they are ready for the second part of the process blow molding into the desired shape.

    Note: If we were talking about injection or injection stretch blow molding, the first step of the blow molding process would be called Preform instead of Parison.

    Extrusion Blow Molding For Plastic Bottles

    Blow molding

    Extrusion blow molding is the simplest and generally the most economical process for making plastic bottles. Control over wall thickness is not as good as in injection blow molding but can be enhanced by techniques such as parison programming and die shaping. It is capable of producing a very wide variety of bottle shapes, including bottles with handles, offset necks, dual chambers, and more. Considerable scrap is produced, especially with complex designs. Usually, scrap can be reused in the process, but not always.

    Extrusion blow molding is also not very economical for very small bottles, so these are usually produced by injection blow molding. The resins used must have sufficient melt strength for the parison to remain unsupported until it is captured in the mold. A large variety of plastic bottles are produced by extrusion blow molding.

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    Injection Blow Molding For Plastic Bottles

    This method combines injection molding of a precisely formed parison with blow molding of the finished container. Therefore, it is able to give fairly accurate control over container dimensions, especially in the critical finish area of the bottle. Injection blow molding is more expensive than injection molding alone since it requires two sets of molds and two molding processes. However, it is capable of producing shapes that cannot be produced by injection molding. It also produces very little scrap.

    Injection blow molding can be used with resins without sufficient melt strength to be handled by extrusion blow molding. Injection blow molding is used for most PET bottles, as well as for most bottles used for pharmaceutical products. It generally cannot economically produce bottles with handles, although manufacturers continue to innovate in this area.

    We Are The Founders Of The Double

    But what are the origins of blow molding?

    Developed in the late 1930s, blow molding is a manufacturing process that is used to form hollow plastic parts. It is most commonly used to make plastic bottles. In principal, the basic blow molding process is similar to glassblowing. Plastic resin is melted and formed into a hollow tube or parison which is then placed into a mold. The parison is then inflated using compressed air to form a finished part.

    In the early 1960s, PFC founder Peter T. Schurman realized that he could combine two hollow blow molded parts to form the lid and base of a portable container or enclosure, and the doublewall blow molded carrying case was born.

    Compared to many other industrial operations, blow molding doublewall cases is a surprisingly simple process, yet one that yields amazing possibilities.

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    Four Benefits Of Blow Molded Plastic Solutions

    Blow molding is one of the many processes used by plastic injection molding companies. It involves placing a molten tube of thermoplastic material within a mold cavity and inflating it with compressed air. The air forces the molten tube to take the shape of the mold cavity it was placed in.

    Due to its efficiency, the blow molding process can be used in different industries. In addition, the process has enabled engineers to attempt the creation of several designs and applications resulting in multiple uses. The following benefits are four significant advantages of blow molded plastic solutions.

    1. Automation

    Earlier developments of the Placo X-Y machine from Japan led to the introduction of 3D blow molding. 3D blow molding is an automated production process that, due to the accurate receptacle it creates, enables the seamless incorporation of parts and increased production speed. Also, automation help manufacturers retain the quality of a wide range of blow-molded products.

    2. Mass Production

    The blow molding process results in quality output. For this reason, it is one of the most used in plastic production globally. With the use of machines that have 3D molding capabilities, blow molding can help manufacturers produce many units within a short period of time.

    3. Cost-Effective

    4. Multiple Production Methods

    Blow Molded Plastics Companies List

    The blow moulding process

    Manufacturers use the blow molding process in order to form a smooth, airtight, uniform product that does not need to be assembled. Also, blow molded products are capable of holding a variety of substances such as herbicides, pesticides, cosmetics, and automotive oil. Some of the many industries that use blow molded plastics include: automotive manufacturing, food and beverage, lawn and garden, waste collection and recycling, storage and transportation, organization, office, healthcare and more.

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    Advantages And Disadvantages Of Blow Molding

    Most plastic producers now use this approach because of the apparent advantages it provides. However, there are certain disadvantages to it that we should be mindful of determining what is best to use for the benefit of everyone. Here are the benefits and drawbacks of blow molding:

    List of Advantages of Blow Molding

  • It is a technological revolution.
  • Many injection molding companies moved to Blow molding because it is said to have revolutionized the manufacturing industry by encouraging businesses to use it extensively to satisfy customers’ demands for plasticware.

    If you can see, this plastic processing process, now followed by injection molding companies, has resulted in many production benefits, such as fast manufacturing and high volume yields, which ensures that we can manufacture a large number of plastic containers.

  • It is capable of producing a wide range of products.
  • This procedure has been applied to most plastic containers on the market today that store some liquid. Indeed, the widespread use of blow molding has allowed engineers to experiment with a wide range of applications and designs, resulting in many intriguing applications. To name a few, items made with this technology include fuel tanks, car seat support, flower pots, and toy wheels.

  • It is cost-effective.
  • It allows for a variety of manufacturing processes.
  • It encourages increased efficiency.
  • It provides the advantages of automation.
  • List of Disadvantages of Blow Molding

  • It is heavily reliant on petroleum.
  • Types Of Blow Molding

    The molding process has three main types: extrusion, injection, and injection stretch blow molding. As we already explained above, extrusion blow molding is a basic process. Here, the plastic pallets are fade through the hopper. Then, manufacturers heat these pallets to make molten plastic. Then the formation of a plastic tube takes place. This tube is then transferred to the mold. The compressed air then inflates this plastic tube. As a result, it takes the shape of the mold. Once cooled, the machine ejects the product.

    Furthermore, the injection and injection stretch blow molding replaces the parison . Instead, this process involves preform. Preform means a plastic tube with a hole is manufactured ahead of the final product manufacturing. These preforms are manufactured by injection molding. The manufacturers then further process these preforms to take the necessary shape.

    The injection and injection stretch blow molding simplifies and streamlines the process for mass production. It also increases the overall speed of production.

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    Injection Stretch Blow Molding

    Injection Stretch Blow Molding has two main different methods, namely Single-stage and Double-stage process. The Single-stage process is then again broken down into 3-station and 4-station machines.


    In the single-stage process, both preform manufacture and bottle blowing is performed in the same machine. The older 4-station method of injection, reheat, stretch blow and ejection is more costly than the 3-station machine which eliminates the reheat stage and uses latent heat in the preform, thus saving costs of energy to reheat and 25% reduction in tooling. The process explained: Imagine the molecules are small round balls, when together they have large air gaps and small surface contact, by first stretching the molecules vertically then blowing to stretch horizontally the biaxial stretching makes the molecules a cross shape. These “crosses” fit together leaving little space as more surface area is contacted thus making the material less porous and increasing barrier strength against permeation. This process also increases the strength to be ideal for filling with carbonated drinks.


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