Did you know with the silicone extrusion process you can manufacture various silicone materials into consistent shapes without alteration? Well, this process is also easy and can be done in just simple steps. Consider reading on to have a full understanding of this whole process without leaving out any important information.
What Is the Silicone Extrusion Process
The silicone extrusion process is a manufacturing process of silicone that creates various silicone materials by pushing solid or uncured silicone rubber through a shaped die (extruder) to form various desired shapes.
Various intricate shapes that you cannot achieve with other types of methods are formed through the extrusion of silicone, making it one of the most preferred choices.
The manufacturing process works by feeding uncured silicone through an extruder. After which the material is shaped by the extruder, and goes through the conveyor belt with the means of a hot air oven to cure the material.
Types Of Silicone Extrusion Process
Since the extrusion process of silicone is versatile, there are several ways in which you can carry out the process. The subsequent paragraphs show the types of silicone extrusion.
Silicone Strip Extrusion
This type of silicone extrusion process is based on creating silicone tapes or stripes. Additionally, there’s a need for consistency in the thickness rating for them to fit and perform excellently where applicable.
Silicone Tubing Extrusion
This is the most common type of extrusion process. Silicone tubing extrusion enables you to create silicone straws or tubes which you can use for various purposes.
Additionally, manufacturing silicone through tubing extrusion gives room for the creation of tubes with diverse properties like diameters, thickness, etc. You can use these tubes in various industries like food, medical, and other industrial applications.
Silicone Profile Extrusion
When you want to create silicone products with varying cross-sectional shapes, profile extrusion will get the job well done. The reason is that cross-sectional shapes are intricate, therefore you might not feel comfortable processing them with other methods of extrusions.
Silicone Solid Cord Extrusion
The solid cord is a recommended type of extrusion process if you want to create a silicone rod or cord that is cylindrical like seals, o-rings, etc.
Silicone Sponge Cord Extrusion
Sponge cord extrusion has similarities with the solid cord extrusion process. The only difference is that sponge cord extrusion has cellular structures. That is, the process does not mandate cylindrical silicone extrusion profiles.
Silicone Wire and Cable Coating Extrusion
In this type of silicone extrusion process, you make sure that cables and wires have a tiny layer of silicone. The purpose of this is to safeguard the wires and cables from electrical overloading and harsh environments.
Custom Silicone Extrusion
Here, you can create products that are up to your actual specifications due to the versatility of this type of silicone extrusion. Make sure you outline the parameters and standards you want your silicone extrusion to be for you to achieve your desired results due to the complexity of silicone products.
Two-color Silicone Extrusion
With this type of silicone extrusion, you can create silicone material in different colors or shapes. In simple words. Two color extrusion types have mixed print heads of extrusion with two different colors of material.
Multi-Lumen Silicone Tubing Extrusion
The multi-lumen tubing type of silicone extrusion enables you to manufacture various tubes with different channels. This silicone medical tubing manufacturing process and the silicone tubing extrusion process are very similar, especially in applications, material use, extrusion technology, etc.
Materials And Tools Needed For Silicone Extrusion Process
Before you move to the process of silicone extrusion, you need tools and materials to prepare for the process to be completed seamlessly. Here are they:
Raw Material
To start this process, the first thing you need is your silicone rubber which is your main raw material. It’s important to know that the material (silicone rubber) comes in various forms and grades like pellets, compounds, etc. The type you would choose is dependent on the final output you want to get. However, if you want to conduct medical silicone extrusion, make sure that the selected material is up to standard.
Extruder
An extruder is a crucial tool you will use during silicone extrusion. It’s made up of a barrel, hopper, and a processing system manufactured with screws or pistons.
Die Or Tooling
Die or tooling is needed in the silicone extrusion process to help you achieve your desired shape through molding after they are out of the silicone extruders. The majority of the die or tooling you will find are customized.
The purpose of this customization is to help you produce different profiles. Therefore, you should consider having a die shape that has silicone medical application if that’s your desired shape.
Curing Equipment
Some curing equipment you can use when you realize there’s a need for additional curing after the silicone material has gone through silicone sponge extrusion are curing tunnels, ovens, and so on.
The purpose of these curing equipment is to provide needed heat for reinforcing needed for the initial silicone extrusion, cross-linking functionalities, and giving more strength to the bonds of the polymer chains.
Safety Gear
Some safety equipment you could use are safety goggles, gloves, and other gear that can help you stay safe. Remember, the silicone extrusion process is straightforward, however, the process mandates proximity to the machines. Therefore, do not compromise on ensuring you work with safety gear.
Quality Control Equipment
Make sure you have quality control equipment tools like micrometers, durometers, universal testing machines, spectrophotometers, etc. The purpose of some of this equipment is to keep a close watch on the hardness, color, and other properties after you have finished with the production process. When you do this, you can rest assured that the final product is up to your requirements.
The Step-By-Step Process Of Silicone Extrusion
The execution of the silicone extrusion process needs to be done accordingly for you to achieve your desired result. Here is how:
Preparing Raw Material
The first thing is to prepare your raw material which is silicone rubber. Make sure that the silicone rubber is in the form of solid pellets, or a compound in the form of a gum.
Note: Pay closer watch to additives because some silicone comes with colorants, fillers, and so on. Therefore, make sure it’s what you want before you proceed.
Mixing and Milling Material
At this stage, bring your silicone rubber and add different additives to it. Examples of these additives are curing agents, reinforcing fillers (such as silica), and so on. Then compound and mix them together with your silicone rubber.
The purpose of mixing and milking these materials is to get your desired properties for you to have the best use where it’s applicable.
Note: The actual properties you want to achieve at the end are what determine the type and quantity of additives you add in this process.
Setting Up The Extrusion Process
The next thing to do is to set up your workspace and get ready to start. Now is the time to make use of your silicone extruders machine with the die.
Heating and Cure
Now is the time to kickstart the silicone tube extrusion process. Next, make sure the temperature of the furnace heats up to 700°C Celsius which is recommended for the first stereotyped silicone extrusion product. Next is to start baking, make sure that the temperature is between 200 to 250°C. Remember, to what extent the baking temperature needs to be heated is based on the material properties. Nevertheless, 20 meters is usually the length of a baking bath. The main purpose of the baking path is to finalize the silicone product through molding and curing.
Cutting and Final Processing
After the curing or cooling process, cut the silicone product into your desired lengths. At this stage, apply if you have any processing steps to make sure the silicone is up to your requirements.
Quality Control
Make sure you do a quality control test to make sure that the final properties of the silicone product is up to your requirements. For example, if you produce food-grade silicone, verify and be assured that the final product meets biocompatibility and other related standards.
Benefits Of Silicone Extrusion Process
The silicone extrusion manufacturing process has presented itself as a big deal in the presence of silicone extrusion manufacturers due to the unique benefits of silicones produced from this process. Let’s take a look at its benefits.
- Temperature Resistance: With the silicone extrusion process, your final product will maintain its properties and flexibility from -60°C (-76°F) to 230°C (446°F) temperature resistance.
- Flexibility and Elasticity: Since you can easily conform complex shapes to unconventional shapes with the silicone rubber extrusion process, that means optimal flexibility, strength, and elasticity in your silicone is sure. Additionally, irrespective of how much you compress or expand your extruded silicone, the properties remain constant.
- Chemical Resistance: Silicone products manufactured through the extrusion process exhibit excellent chemical resistance, meaning you can use them even in harsh chemical environments.
- Biocompatibility: Silicone products made through the extrusion process are biocompatible, which means you can utilize them to create medical grade silicone tubing and food-grade silicone due to their ability to contact the human body without repercussions.
- Safety Parameters: When you carry out the silicone rubber extrusion process the right way, you’ll realize they adhere to stringent safety requirements like moisture and ultraviolet resistance, making them a perfect fit for aquatic and outdoor activities.
- Easy To Clean: Cleaning of silicone products made through the extrusion process is relatively easy, making them a good fit for heat car and food-making applications.
- Applicable In Various Industries: You can have your silicone product work excellently in various industries when produced with an extrusion process since you know the industries you want to apply your silicone product to, and you choose the materials accordingly.
Conclusion
Lastly, understanding that the silicone extrusion process requires carefulness to achieve your desired result is important. However, familiarizing yourself with the material, equipment, and the step-by-step process in this article will help you expedite the whole process.
More Resources:
Ultimate Guide to Silicone Die Cutting – Source: TOGOHK
A Complete Guide to Silicone Mixing – Source: TOGOHK
Silicone Foam Molding: All You Need To Know – Source: TOGOHK
Ultimate Guide To Silicone Compression Molding – Source: TOGOHK
Step By Step Guide To Silicone Transfer Molding Techniques – Source: TOGOHK