What are the precautions for customized liquid silicone products?
🕙 2023-02-09 👆
The difference between liquid silicone and silicone
Today, let me take you to do a preliminary understanding, and then explain to you the key points to pay attention to. There are many differences between liquid silicone and traditional thermoplastic material processing, increasing the difficulty of processing. LSR is quite different from traditional thermoplastic materials in shrinkage rate, demoulding, die materials, cold flow system, temperature control and other aspects, which makes the processing difficulty of LSR greater than that of ordinary thermoplastic adhesive. The waterproof silicone ring of smart phone is mainly formed on the original metal or plastic parts, and the volume is smaller than that of the general use of silicone ring, and the compatibility with the case and accessories is higher, and more precise (trace) injection molding technology is needed.
Customized liquid silicone products need to pay attention to the following key points:
●A full mixture of liquid silicone
Precise mixing ratio: LSR is A and B two-component raw materials. Before injection molding, it must be fully mixed in accordance with the exact 1:1. If it is colored precision liquid silicone products, it must also be accurately controlled.
Mixer: The static mixer is A key component in injection molding. Only after the static mixer is fully and evenly mixed, can the liquid silicone injected into the mold be completely vulcanized and formed
●Seal and temperature control of injection molding machine components
Due to the low viscosity of LSR, it is necessary to seal the screw to consider the backflow and leakage of the material
Since the mold is heated during the molding process of precision liquid silicone products, in order to prevent the solidification of lsr, a water-cooled nozzle can be used to ensure that the temperature is low enough.
●Control of finished product during injection molding
Parting line: Considering the position and accuracy of parting line in advance helps to avoid air entrainment and welding and avoid burring
Shrinkage: Although LSR does not shrink in injection molding, it usually shrinks by 2% to 3% after release and cooling due to its extremely high coefficient of thermal expansion.
The position of the glue mouth: the actual shrinkage rate of the product needs to be considered.
Vacuum: When designing the parting line, ensure that the mold is sealed. The vacuum pump vacuums all the cavities through the jig under the mold switch.
Demoulding: Generally using fractionating column tray, push pin and air push top demoulding technology, or manual demoulding.
Mold temperature: The lsr is vulcanized in heating, and the temperature distribution within the mold must be controlled evenly. Temperature difference is controlled at ±10℃.
Frequently Asked Questions
| Q1:Why choose us? | |||||||||
A:We are a wholesale factory,can provide you the competitive prices and best service.Can be OEM/ODM to meet your special requirements. | |||||||||
| Q2:What is your MOQ? | |||||||||
| A:Low MOQ,we support small bulk wholesale,But large quantity will more cheaper. | |||||||||
| Q3:When can we get the quotation? | |||||||||
| A:We usually quote within 24 hours after we get your inquiry.If you are very urgent to get the price,please call us or tell us in your email so that we will regard your inquiry priority. | |||||||||
| Q4:Can I get a sample? | |||||||||
| A:Absolutely you can,But sample fee and shipping fee will be charged.Thank you for understandin! | |||||||||
| Q5:Do you offer other service? | |||||||||
| A:Yes,If you have any question, we will do our utmost to help you ,and reply to you as soon as we can.We also can be your purchasing agent in China. |
Still Have Questions?
If you cannot find an answer to your question in our FAQ, you can always contact us and we will be with you shortly.
Previous：Characteristics and molding re