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Liquid Silicone Rubber (LSR) Molding: Anticipate and Solve Problems Before Product Production

 Last Update: 2022-08-24
 Source: Internet
 Author: User

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Nowadays, the demand for liquid silicone rubber (LSR) products is growing, especially in the medical and baby care fields, its high thermal stability and good physical properties make more and more applications choose to use LSR material

However, LSR molding is a challenge

Figure 1 - Several cycles of SIGMASOFT® Virtual Molding analysis take into account the effects between mold components

The analysis shows that under the current arrangement of heating rods, the temperature distribution inside the movable die side presents a large gradient, as shown in Figure 2: the bottom temperature is 170°C, and the temperature of the nipple is nearly 20°C lower
.

Figure 2 - Thermal analysis within the movable die side shows a large temperature gradient between the bottom and top of the nipple
.

Figure 3 - Degree of cure after 30 seconds
.

However, LSR molding is a challenge
.

Figure 1 - Several cycles of SIGMASOFT® Virtual Molding analysis take into account the effects between mold components

Figure 2 - Thermal analysis within the movable die side shows a large temperature gradient between the bottom and top of the nipple

Figure 3 - Degree of cure after 30 seconds

.
Assuming a constant mold temperature of 160°C would erroneously result in shorter cycle times than would be required under actual mold temperature conditions
.

The application of SIGMASOFT® Virtual Molding in LSR molding enables early detection of possible causes of quality problems, thereby saving manpower and reducing productivity losses in the early stages of product production
.
Even at the design stage, quality and molding issues can be assessed in advance, the number of iterations necessary in product and mold development can be reduced, mold development time can be shortened, and capacity for new projects can be released
.

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