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How To Choose A Horizontal Injection Molding Machine?

In order to produce a plastic product that meets consumer expectations, it’s imperative not to overlook the appropriate production process. Typically, customers in the injection molding industry, having been in the sector for years, possess the capability to independently choose injection molding machines that are a good fit for them. Nevertheless, in certain situations, they might require guidance from the manufacturer in determining which specifications are appropriate for their needs.

Occasionally, they might inquire whether the manufacturer’s machines can produce the products they envision, for which they might only have a concept or sample, or they might ask about the most fitting model. Moreover, some products may necessitate specific devices like accumulators, close loops, and injection compression to work in harmony with the chosen unit for efficient production. Thus, it’s crucial to ascertain which type or model of the machine will best meet their needs.

Horizontal VS Vertical Injection Molding

Injection Molding can typically be categorized into two types based on the opening and closing direction of the mold clamping unit: horizontal and vertical. Both vertical and horizontal injection molding function similarly by injecting molten resin into an injection mold, securing the mold to let the part solidify, opening the mold, and then ejecting the finished parts.

Most common type of injection molding machine in the market

The Horizontal Injection Molding Machine is regarded as the most prevalent type in the market. The majority of injection molding machines are horizontal, making them perfect for cylindrical parts and suitable for high-volume production. ZHENHUA stands as the premier producer of Horizontal Injection Molding Machines. Conversely, the vertical type is appropriate for smaller insert products.

Difference between horizontal injection molding and vertical injection molding

Horizontal injection molding machines are designed with a low center of gravity, making them easy to operate and maintain, and are well-suited for the development of automation systems.

Vertical injection molding machines are distinguished by their compact size, making them easy to install. However, products must be manually removed after ejection, complicating automation. These machines are exclusively suited for the production of small plastic components.

7 Steps to Choosing the Right Horizontal Injection Molding Machine

Let’s delve deeper into the selection process for Horizontal Injection Molding Machines. The choice is primarily influenced by several factors including the molds, products, types of plastic, and specific molding requirements. Hence, it’s crucial to gather the following details before making a selection:

– Dimensions of the mold (width, height, thickness), its weight, and any unique designs.

– The type and amount of plastic materials being used (whether single or multiple types).

– The dimensions (length, width, height, and thickness) and weight of the products.

– Requirements for molding, such as quality and production speed.

With this information at hand, proceed with these steps to choose an appropriate injection molding machine:


Opt for the series/type/collection that best fits your products and materials.


Verify if the tie bar spacing, mold thickness, minimum mold dimensions, and mold plate dimensions are compatible with the mold to ensure the machine can accommodate it.


Assess if the Mold Opening Stroke and Ejecting Stroke are adequate for product removal based on the mold and product dimensions.


Calculate the required mold clamping force using the product dimensions and plastic material.

5.Injection Capacity:

Estimate the injection volume needed based on the product weight and the number of mold cavities, then choose an appropriate screw diameter.

6.Effective Injection:

Evaluate the “screw compression ratio” and “injection pressure” based on the plastic materials to ensure efficient injection.

7.Injection Speed:

Examine the injection rate and velocity to ensure rapid injection.

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