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A Simple Guide to Plastic Molding

Plastic Molding

This guide will explain the various types of configurations currently available to help you find the perfect process for your product.

Therefore, you need special plastic parts or products, but you don't know how to do it.

Big or small? Should it be flexible or compact? Is it round, square or weird? Do you already have a template or do you need it?

What is plastic mold?

Sometimes post-molding is a production process by pouring liquid or flexible materials using a solid frame called a mold or die.

When the plastic is poured, a liquid powder or polymer such as polyethylene or polypropylene is placed in a hollow mold so that the polymer can be formed. Depending on the type of process used, different temperature and pressure ranges are used to make the finished product at qmolding.com.

The history of plastic mold

In the late nineteenth century, plastic molds began to meet the need for plastic billiard balls, instead of the ivory billiard balls that were widely used at the time. In 1868, John Wesley devised a way of life to make billiard balls by injecting celluloid into a mold. Four years later, Hayat and his brother invented a patent machine to automate the process. It was the first plastic injection molding machine available and used a basic piston to inject plastic into the mold through a hot cylinder.

In 1946, James Hendry invented the IUD injection molding machine, which replaced the piston injection technology. This is the most widely used technology today.

Modern rotary molding has a rich history that began in 1855 when rotation and heat were used to produce metal artillery bullets in England.

Plastics were processed in the early 1950s when the first spin casting was used to make dummy heads. Then, in the 1960s, the modern rotary formation process allowed us to make large sacred containers of low density polyethylene. In the past, process improvements, sophisticated equipment and advances in plastic powders have accelerated the process of creating a finished product that has increased the popularity of spin casting.

Type of plastic mold

The most popular techniques in plastic molding are rotational molding, injection molding, blow molding, pressure molding, extrusion molding and thermoforming. We will discuss all of these techniques in this guide to help you find the best injection molding services manufacturing process for your part or product.

  • Injection mold
    Injection molding is the process of making special plastic components by injecting liquid plastic into metal molds at high pressure. Like other forms of plastic molding, after liquid plastic is injected into the mold, the mold cools and opens to expose pieces of solid plastic.

    The process resembles a gelatinous stencil to form finished products and then cooled.

  • General use for injection molding
    Injection molds are often used to make special plastic parts in very large sizes. Large injection molding machines can make auto parts. Small machines can produce very sensitive plastic parts for surgical applications. In addition, there are many types of resin and plastic additives that can be used in injection molds, thereby increasing their flexibility for designers and engineers.

    Injection molds, usually made of steel or aluminum, are expensive. However, if you need several thousand parts per year, the cost per piece is very cheap.

In injection molds, tool production usually takes 12 to 16 weeks and up to four weeks longer.

Rotational Mold

Rotary molding, also called rotational casting, is a manufacturing process for producing large hollow sections and products by placing liquid powder or resin in a metal mold and rotating it in the oven until the resin inside the mold is closed. Continuous rotation of the mold creates a centrifugal force which creates a smooth walled product. After the mold cools, it is removed from the hardened plastic mold.

Very little material is wasted during the process and excess material is often reused, making it economical and environmentally friendly.

  • General use for rotational formation
    Rotary molding is widely used to make large perforated plastic products such as large containers, storage cabinets, auto parts, marine buoys, pet stores, recycled bins, road cones, hats and hard trowel slides and slides.
  • Rotary printing is highly customizable and economical
    The mold itself can be very complex to facilitate the formation of various kinds of products. Molds can include inserts, curves and contours, as well as logos and plastic or metal additions after the product is poured.

In rotary molds, tool costs are lower than injection or blow molds. Even though only 25 products are produced at a time, the result is lower initial costs and profitable production.


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