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Different Plastic Manufacturing Processes to Create Your Product Parts Jul 01, 2021

Different Plastic Manufacturing Processes to Create Your Product Parts

Injection Molded Plastics

Plastic product manufacturing is a very versatile process. Because of parameters such as function, quality, and volume, a number of methods may be best suited for certain batches of production over others. Today, we take a quick look at the various manufacturing methods available to create your product parts based on low, medium, and high-volume manufacturing.


1. Low-volume manufacturing

Low volume manufacturing generally covers the manufacturing of plastic parts within the range of 10 to 100 units. For low-volume manufacturing, we may consider CNC machining and 3D printing.


CNC machining is a subtractive manufacturing technique that uses digital/computer-assisted machining software to shape a block of material through some drilling and milling processes to remove excess materials and form the final product.


We may use 3D printing for low-volume manufacturing to use a computer machine (and a 3D-designed model) to create and piece together the desired shape of the final product from a pool of material. 3D printing is a form of additive manufacturing, and the process is essentially the opposite of the CNC machining process.

These 2 techniques are often best used for low-volume manufacturing to manage profitability and reduce setup or running costs in your project.


2. Medium Volume Manufacturing

Medium volume manufacturing at Premium Parts will typically involve volumes within 100 to 1,000 units. In cases like these, it is crucial to get the design, molding, and shaping very accurate. When producing this range of unit parts, we employ techniques such as casting, rotational molding, compression molding and thermoforming.


Thermoforming involves heating plastic sheets into a malleable state and vacuuming the plastic into the shape of a mold. The formed plastic part is then trimmed to arrive at the final desired product.


Another method used in medium volume manufacturing is casting. When casting, the plastic material is heated to a liquid form and poured into the mold to solidify. The casted part is then removed or ejected from the mold. While casting may sound similar to injection molding and extrusion, the key difference here is that casting uses atmospheric pressure to fill the mold as against the use of actual force in the case of molding and extrusion.


We may also use compression and rotational molding techniques to manufacture medium-volume quantities of your plastic parts. Rotational molding is best suited for big, single-piece hollow parts. It is done by introducing the molten plastic material into a large mold, continually rotating the mold till a hollow shape is formed. The rotational action melts and disperses the resin to fill and coat the walls of the mold. There is no limit to the size of the molding and this process is relatively inexpensive.


Compression molding is a medium to high volume, high-pressure technique used in making complex, highly durable plastic parts. The process starts with pre-heating the resin and placing it in a heated mold cavity. There is then a use of force and pressure to force both the heated resin and mold cavity to contact, fill, form, and cure the end product. The heat and pressure must remain constant during the process.

Compression molding is relatively inexpensive when compared to injection and transfer molding. It is material optimal, leaving very little waste, which is an advantage when working with materials that are considerably costly.


3. High-Volume Manufacturing

High-volume manufacturing often requires advanced production techniques that can deliver high-volume molded parts without any deviation from quality. These methods will often use large machines and equipment in their mass manufacturing.

The common methods for high-volume manufacturing (100,000 and above parts) include extrusion molding, injection molding, blow molding and compression molding (already covered above in medium-volume manufacturing).


Blow molding is a plastic production process used in the manufacture of hollow plastic parts. In blow molding, a molten tube (also called preform or parison) is heated and inflated with compressed air till it fills the mold, cools and forms the shape of the desired product. The difference between blow molding and injection molding is how the former is used for hollow products like bottles while the latter manufactures solid plastic products.


Extrusion molding

Extrusion molding is a plastic manufacturing technique to produce high-end plastic parts by pushing molten plastic through a 2-dimensional die opening to form a molded product. The shape of the die is the shape taken by the tube. The extruded plastic is allowed to cool and form the desired shape. Extrusion molding is often used for sheets, films, pipes, hoses, straws, rods, fiber optic cables and wire coverings.


Injection molding is one of the most popular methods for high-volume manufacturing. This process generally involves heating plastic material into a melted resin and then injecting this into a 2-part mold to cool, solidify and form the molded part.


High-Quality Plastic Part Manufacturing in China

Premium Parts provides high-quality plastic manufacturing across various ranges of volumes. We are always on board to advise on the best manufacturing methods to proceed with depending on the end-use, volume and design specifications for your product. Our engineers are well versed in all the suitable production techniques to ensure that we deliver excellent parts that are optimized for running your project. Get in touch with an expert and receive a free quote on your project now!

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