We have been involved in cable tie manufacturing and injection molding machines since 2012. With extensive experience in cable tie production, injection molding machines, and molds, we also serve as an OEM provider for a well-known Korean brand. And so, we are fully aware of a range of issues in the injection molding production of different kinds of plastic products.
Today, we’re going to talk about one common problem many cable tie production beginners encounter. That is: Can general injection molding machines be used for nylon cable tie production? And the answer is: Yes, but there are challenges in maintaining production stability. Let us explain this in detail.
In cable tie production, the raw materials we typically use are PA6 and PA66. These materials are highly absorbent and flow very quickly. When applied in general injection molding machines, two primary issues arise:
(1) Moisture Absorption: When the materials enter the barrel, they are heated to around 250°C, causing the absorbed moisture to turn into gas. If the gas is not properly vented, the resin cannot flow smoothly into the barrel, leading to unstable production.
(2) Material Drool: The molten plastic tends to drip, which further exacerbates the production instability.
In addition to these issues, general injection molding machines often have fewer mold cavities, which leads to:
– Increased Costs: Unstable production processes require frequent stops and adjustments, driving up operational costs.
– Lower Output: Fewer mold cavities mean lower production volumes, and over time, the clamping unit takes a hit. Since cable tie molds are typically long and thin, unoptimized toggle systems can cause significant structural damage.
As a result, your production costs may rise to a point where importing cable ties from China becomes cheaper than producing them locally, making in-house production financially unsustainable.
So, should you try producing cable ties? Yes, but you need to be clear about the purpose of the trial. The goal should be to gather data and evaluate whether cable tie production is a worthwhile investment. You can assess the following:
By collecting this data, you can adjust your machine setup and recalculate the costs to reach a well-informed conclusion.
Just like learning to swim by getting into the water, the best way to understand cable tie production is through hands-on testing. I can provide you with a cable tie mold, and perhaps some raw materials, to help you conduct your tests.
Cable tie production is a significant investment. Before committing large sums of money, you need solid data to support your decisions. If you’re new to this field, hope this post can help you understand more about the cable tie production. If you have any other problems, feel free to contact us.
Estimate the position of the sol according to the weight of the product and the size of the machine screw. When adjusting, set a reasonable sol position from short to far according to the machine operation display screen. Do not set the melt pressure too high. Generally, it is set to 80Bar-120Bar. The melting speed setting is generally 30%-80% (depending on different materials and product appearance requirements).
The back pressure is the pressure on the molten material at the top of the screw when the screw rotates and retreats.
Increasing the back pressure will increase the melt temperature. But it will reduce the plasticizing rate, make the temperature of the melt uniform, mix the material evenly, and remove the gas in the melt. Usually the back pressure of plastic is 5Bar-30Bar. If the back pressure is too large, the screw will not move back. And if the back pressure is too small, it will not be able to compress the mixed plastic.
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