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Introduction to Vacuum Forming
#1
Introduction to Vacuum Forming

    Several modern conveniences that we enjoy every day are made possible thanks to vacuum forming. Without this versatile manufacturing process, life-saving medical devices, food packaging, and automobiles might look very different. 

    Read on to learn how the low cost and efficiency of vacuum forming make it a great option for commercial manufacturers, independent craftsmen, and DIYers alike.

    What Is Vacuum Forming?

    Vacuum forming is a manufacturing method used to shape plastic materials. During the LED Advertising Light Vacuum Forming process, a sheet of plastic is heated and then pulled around a single mold using suction.

    Vacuum forming is used for a wide range of manufacturing applications, ranging from small custom parts produced on desktop devices to large parts manufactured on automated industrial machinery.

    What are the Differences Between Vacuum Forming, Thermoforming, and Pressure Forming?

    Thermoforming is a manufacturing process where a sheet of plastic is heated to become pliable, then shaped or contoured using a mold, and trimmed to create a final part or product. Vacuum forming and pressure forming are both different types of thermoforming processes. The main difference between pressure forming and vacuum forming is the number of molds that are used. 

    Plastic Trays Vacuum Forming is the simplest type of plastic thermoforming, that uses one mold and vacuum pressure to obtain the desired part geometry. It is ideal for parts that only need to be precisely formed on one side, such as contoured packaging for food or electronics. 

    There are two basic types of molds—male or positive (which are convex) and female or negative, which are concave. With male molds, the sheet of plastic is placed over the mold to contour the inside dimensions of the plastic part. With female molds, the thermoplastic sheet is placed inside the mold to form the outer dimensions of the part precisely.

    In pressure forming, a heated sheet of plastic is pressed (hence the name) between two molds instead of being pulled into place around a single mold using suction. Pressure forming is ideal for manufacturing plastic parts or pieces that need to be more precisely shaped on both sides and/or require a deeper draw (they need to extend farther/deeper into a mold), such as appliance casings that need to look aesthetically pleasing on the exterior and snap into place or fit a precise size on the interior side.

    How Does Vacuum Forming Work?

    The step-by-step Automotive Plastic Parts Vacuum Forming process works as follows:

            Clamp: A sheet of plastic is placed in an open frame and clamped into place.
        
            Heat: The plastic sheet is softened using a heat source until it reaches the appropriate forming temperature and becomes pliable.
        
            Vacuum: The framework containing the heated, pliable sheet of plastic is lowered over a mold and pulled into place via a vacuum on the other side of the mold. Female (or convex) molds need to have tiny holes drilled into crevices so that the vacuum can effectively pull the thermoplastic sheet into the appropriate form.
       
            Cool: Once the plastic has been formed around/into the mold, it needs to cool. For larger pieces, fans and/or cool mist are sometimes used to speed up this step in the production cycle.
        
            Release: After the plastic has cooled, it can be removed from the mold and released from the framework.
        
            Trim: The completed part will need to be cut out of the excess material, and edges may need to be trimmed, sanded, or smoothed.
        
    Vacuum forming is a relatively quick process with the heating and vacuuming steps typically taking only a few minutes. However, depending on the size and intricacy of the parts being manufactured, cooling, trimming, and creating molds can take considerably longer.

    The Pros and Cons of Vacuum Forming

    Many manufacturers, designers, and other professionals choose vacuum forming because it offers a blend of design flexibility at a relatively low cost compared to other manufacturing methods. The benefits of vacuum forming include:

    Affordability

    Particularly for smaller production runs (250-300 units per year), Thermoforming Products are typically more affordable than other manufacturing methods, such as plastic injection molding. The affordability of vacuum forming is largely due to the lower cost for tooling and prototyping. Depending on the surface area of the parts being manufactured and the dimensions of the clamp frame, tooling for injection molding can cost two to three times more than the amount for tooling for plastic thermoforming or vacuum forming.

    Turnaround Time

    Vacuum forming has a faster turnaround time than other traditional manufacturing methods because tooling can be made faster. Production time for vacuum forming tooling is typically half as long as the amount of time required to produce tooling for injection molding. When 3D printers are used to create molds, turnaround time can be even faster. By increasing production process efficiency, vacuum forming enables businesses to get new designs in the hands of consumers faster. 

    Flexibility

    Vacuum forming gives designers and manufacturers the flexibility to test out new designs and build prototypes without massive overhead or lag times. Molds can be made out of wood, aluminum, structural foam, or 3D printed plastics, so they can be changed out and/or modified more easily compared to other manufacturing processes.

    Vacuum forming also gives designers the ability to offer more color options and customization to customers. This gives many businesses the freedom to offer one-of-a-kind designs and produce custom products, such as dental retainers, to clients at an affordable price point.

    The Various Applications of Vacuum Forming

    In modern society, it would be a challenge to get through an entire day without coming into contact with at least one part that has been made through vacuum forming. This manufacturing process is used to produce a wide variety of parts in a huge cross-section of industries, including:

    Automotive and Transportation

    Manufacturers use vacuum forming to create a number of pieces and parts in cars, buses, boats, and airplanes. In cars, everything from bumpers to floor mats, and even truck beds, are manufactured using vacuum forming. Vacuum forming allows car companies to produce various color and detail options for consumers and gives designers the freedom to test out new prototypes in the development process.

    Industrial

    Manufacturers also use Thermoforming Machine and Equipment Shell to produce many industrial crates and contoured containers for machinery. Vacuum forming is a great manufacturing process for parts primarily used outside or ones that may come in contact with a heat source because industrial manufacturers can use a variety of flame-retardant and UV-resistant materials. For example, fire-retardant UL 94 V-0 polyvinyl chloride (PVC) and UV filtering acrylic (PMMA) can both be vacuum formed.


    Medical

    Medical Equipment Vacuum Forming Cases and components that need to be antimicrobial or have resistance to contaminants are often manufactured through vacuum forming. This includes medical packaging, the pharmaceutical trays pills are packaged in, components of hospital beds, and MRI and CT machine exterior pieces.
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