What is Micro-Molding?

Micro molding is a process of manufacturing plastic parts that are small in size and have intricate details. This process is done using a mold made with tiny dimensions. The mold is then filled with molten plastic, and the plastic is allowed to cool and solidify. Once the plastic has cooled and solidified, it can be removed from the mold and used as desired.

Let's get to know more about Micro-Molding in detail so that you can better understand the process and all aspects of it.


What is Micro-Molding?

Micro molding is a technique for molding and manufacturing thermoplastics to produce items, sections, and parts that frequently weigh less than a gram and have a diameter or dimension of only a few millimeters.

The components involved are defined by more than just their size, though. It also refers to accurately, consistently, precisely, and efficiently manufacturing large quantities of these components, which are frequently quite complex and intricate.

Micro intolerance is often used to measure the dimensions of intended designs. One factor that determines whether micro injection molding is employed is micro intolerance. This describes how closely the required measurements must match the intended design, or more simply, how small the margin of error must be.

The tolerance for micro-molding must be 1/100th of an inch, while in specific circumstances, the molded part must be 1/1000th of an inch. Using traditional injection molding, it is typically possible to produce tiny pieces with less precise tolerances.


Things to Keep in Mind With Micro-Molding

Three main considerations should be made while using micro molding:

•    Parts are classified as micro when they have a small size. Most often, micro molding is described in this way.

•    Micro features are little components on a bigger component. The part may be large overall, yet its parts may be small or have minute features.
•    How closely the parts must measure up to the required measurement to be deemed excellent or useful is known as micro intolerance. A part must fit within the required measurement which could be as tiny as a thousandth of an inch before it can be molded. Small pieces with looser tolerances are referred to as normal molding since they are easier to produce.


Challenges Related to Micro-Molding

One of the trickier parts of the injection molding process is tool design. The secret to quality is a double-sided mold manufactured from materials that can withstand high-pressure injection without cracking, even after hundreds of usage.

In micro molding, tool design presents an even greater problem. The demand for steel tolerances to be within a few microns can only be met by a very small number of vendors.

Whenever the two sides of a plastic component meet, there is a narrow line of separation called the parting line. Because this seam is usually only a few microns wide and is often shaved down, it usually does not pose a problem. In micro-molding, the separating line can greatly affect the assembly and affect how well it fits.

The gate positioning, which is the opening in the mold through which the plastic is fed into the cavity, may affect the part's overall performance and perfection. To ensure quality and a consistent flow, it is crucial to choose the right location for the opening in the tooling.

A vestige, or small runner of plastic that needs to be clipped when the plastic cools, can be left behind by the gate. Nevertheless, accuracy is crucial, so care must be taken when trimming and completing the gate vestige.

Benefits of Micro-Molding

Important tasks should employ micro-molded products. It makes complete sense to employ these products where there is an urgent requirement for these particular qualities because the production cost of these products is fairly high. The following are some advantages of adopting micro-molded products:

•    The goods are quite light in weight. Consider micro-molded items if weight is an extremely significant factor in your application. For instance, the weight of each component can have a significant impact on how well an application performs in the aerospace and medical industries.

•    In keeping with the previous statement, micro-molded goods are also incredibly compact. They ought to be utilized in particular applications where component size affects the effectiveness and functionality of the application.

•    For the most part, micro molding machines take less time and energy to create the same amount of parts. Consequently, these devices can save energy expenses when utilized properly. One can anticipate more revenues when manufacturing times are cut down.

To make sure the project is made with prescriptive specifications, complete automation is used during these procedures. Manufacturers also take great care when selecting materials for a product to ensure that it meets the requirements of the application.

The chemical and physical characteristics of a material affect the dependability of a product. The potential of your product can therefore be maximized when you work with a skilled injection molding manufacturer such as MING-LI.



The amount of precision and knowledge needed to construct microparts is exceptional. Making a small part can be challenging, but as long as the company is set up to produce high-precision parts, the item can be made easily. For each business, the micro molding procedure is different.

At MING-LI, we manufacture specialized plastics using injection molding and thermoforming for a range of industries, including automotive, medical, and telecommunications. We provide customers all across Taiwan with durable, high-quality bespoke plastics at competitive prices with short lead times.


To discuss micro molding options for your project, get in touch with MING-LI or submit a quote request right away! We are the company you can rely on for plastic micro molding.


TEL : 886-4-23599288

FAX : 886-4-23599299

No. 13, 36 Rd., Taichung Industrial Park, Taichung 40768, Taiwan

Website : www.moulds.asia


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