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Tips on How to Test Jewelry Vulcanizer

The majority of problems jewelry moldmakers experience when vulcanizing silicone rubbers and natural rubbers is due to faulty or incorrectly set vulcanizing presses.


Mold that is exposed to too low temperatures will not heal properly. It will become soft, gummy, and easy to deform.
Rubber will become rigid if the temperature is too high. It may also shrink more and even become liquid.
The mold will curl if one heating plate is lower or higher than the other.

Jewelry Digital Vulcanizer Rubber Mold Jewelry Making Machine Hot Vulcanizing Machine
 

Vulcanizer problems result from:

Temperatures that are not properly set
Faulty thermostats
Heating elements that are defective or damaged
In part, most jewelry industry vulcanizers are manufactured with cheap and unreliable controls. This is because jewelry mold rubbers can be very forgiving of mistakes. While this works most of time, sometimes things can go wrong.

A wise mold maker will regularly check the temperature of his Vulcanizer with a good thermometer, just like one might check the oil in one's car.

It is a good idea to use a pen or another device to mark the required temperatures on your vulcanizer's knob and round dial. If the dial is accidentally moved, it will be obvious.

It is a good idea to take the dial off the dial if you share your workspace with others or if your children are frequently in your work area.

Don't trust these dials with your temperature readings. They are often completely inaccurate.

You are less likely to experience a problem with your jewelry rubber mold vulcanizer if it has one or more digital thermostat controllers. Even the best-made machines can still go wrong.

A few vulcanizers include a hole in the bottom or top plate that allows for the inserting of a thermometer. Although this is better than nothing, it will not provide an exact reading. The thermometer on the bottom plate won't show if the top plate is too hot or cold, for instance.

Although it is more convenient to place the thermometer between two plates, it will not provide an exact reading. The thermometer will not show the average temperature of two plates if they are heated at different temperatures. The thermometer will only show the average of the two plates, so if one plate is 50° too high and the other 50° too low, it will be correct. The attached photos show Castaldo's preferred technique. As an inexpensive and disposable insulation, place a small block made of wood between the plates.

Your thermometer probe should be placed first on top of the wood, and then underneath. You can also measure the left and right sides of each plate if your vulcanizer measures large. You should close the plates of the press quickly, making sure not to damage your thermometer probe.

Jewelry Mold Vulcanizer Digital Heavy Duty Vulcanizer Jewelry Making Equipment



Like all heating devices, vulcanizing presses are set to maintain a certain temperature. The thermostat will control the temperature and turn them on or off. This is visible in vulcanizers equipped with a temperature indicator light. The heating lamp turns on and off as needed. The lamp turns off when it is finished, and the press stops.

In each case, take your temperature readings at the top of every cycle.

Digital temperature controllers allow vulcanizers to maintain a constant temperature within a range of 1 to 2 degrees. Even though 5-10 degrees is a good range for older models, we have seen cases where there are 25-degree or even 50-degree variations.

Before you begin your tests, let the jewelry rubber mold vulcanizer heat stabilize for at least an hour. They will measure the temperature at one location, then watch it go through several cycles to note the temperatures. Next, repeat the process with the other plate, or in larger presses in both the left and right regions.

You don't have to watch the machine go through this process. You can do other things and check the vulcanizer every once in awhile.

Both dial and digital thermometers are both good options. Glass thermometers can also be used, but they might crack.

It is easy to adjust the heating plates' settings if your vulcanizer has two controls.

However, if you only have one control for each plate, it might not be possible to reach the desired temperature. You can temporarily remove the mold from your press at the halfway point. Then, flip it over and return it to the press for the rest of the time. This can help reduce the temperature.

Longer term solutions include either replacing or repairing the machine.


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