Applications of a Vacuum Mixer
Vacuum mixers have many applications in the manufacturing of cosmetic and pharmaceutical products. They eliminate micro air bubbles in the product. This improves the quality of the dispersions and reduces oxidation.
Some solid active ingredients must be bound with liquid binders to make them suitable for use in a dosage form such as powdered dietary compositions. Then the material must be dried. This can be accelerated enormously by vacuum mixing.
Preparation of cements and amalgams
A vacuum mixer is a machine that carries out periodic processing of viscous materials (such as cement, amalgams, and other dental preparations) under vacuum conditions. This reduces the formation of gas inclusions and bubbles, preserves product stability, and ensures that the final product is of high quality. This device is used in various industrial applications including food processing and pharmaceutical production. It can also be used to prepare emulsions and liquids for coating or packing.
In the case of cements, it is very difficult to prevent hydration or oxidation, even in air-impermeable bottles and containers. This can result in the loss of desirable chemical constituents or a change in their concentrations. Such changes can be very detrimental to the performance of the finished cement.
One method to combat such changes is by incorporating a complexing agent into the cement powder. The complexing agent can either be part of the liquid component or incorporated into the dry cement powder itself. In the former case, the polyacid dissolves when the liquid is mixed with the cement powder. The resulting reactivity of the cement is increased.
Another method to improve the performance of bone cements is to prepressurize them prior to application. This prevents bubble formation and aides the desired stratification of the cement around the prosthesis. The cement can be mixed at an adjustable pressure in a vacuum mixer. This system also helps prevent dilution or oxidation of the liquid component.
Dispersal of powders in liquids
Many thickening ingredients are difficult to disperse with traditional mixing technology. They are usually poured onto the liquid surface and then mixed in, creating dust and often lumps, agglomerates and crusts that require a lot of time and strong shear to break vacuum mixer apart and disperse. A vacuum mixer allows the powders to be inducted directly into the liquid stream, making it easier for them to be dispersed and incorporated.
In a shear-ring dispersing machine such as the Conti-TDS, the powder is inducted into the high-shear zone via an induction vacuum that is created precisely where the powder needs to be dispersed. The machine uses the rotor-stator principle to build up an induction vacuum exactly where shear conditions are highest. The powerful shear of the rotor-stator forces the powder into contact with the liquid and immediately wets it. This creates a highly effective, finely distributed dispersion that is far more effective than can be achieved with stirrers or dissolvers.
This method of powder induction avoids problems that occur with wanding systems or bag addition directly into the mixing vessel. These include uncontrolled powder spillage, agglomerates that form in the interstices between powder particles, dusting around the vessel and the knifes inside and a crusty build-up on the vessel walls or the devices in the vessel. It also makes it possible to use the machine for a wide range of applications. The machines can be used to handle products with different viscosities and they can be equipped with a number of agitation options depending on the product requirements.
Impregnation of filler pellets
A vacuum mixer can be used to impregnate filler pellets in a molding composition. After a fine vacuum has removed most of the air from the pellets, liquid active ingredients are sprayed into the mixer and then the system pressure is slowly returned to atmospheric pressure. This process is called “impregnation.” During this time, it is important to visually monitor the mixture. When the desired level of vacuum has been reached, it is recommended to isolate the vessel and shut off the pump. This will avoid drawing out volatile constituents and upsetting the formulation.
Another benefit of using mixer manufacturer a vacuum mixer is that it helps to eliminate difficult voids and entrapped gasses, especially during heat-accelerated cure. The process also allows materials to dry at lower temperatures, which can be beneficial for many applications.
A vacuum mixer can be used for a variety of applications in the automotive industry, including dispersing pigment in paint, preparing SPUR sealants, and vacuum degassing high-performance epoxy adhesives. In addition, they can help to reduce dust production and improve product handling. These machines are widely available and can be purchased from a number of manufacturers. They are also available for rent, which can be a cost-effective solution for small-scale mixing projects. They also adhere to strict standards for medical and food equipment, which makes them a good choice for use in laboratories where contamination is a concern.
Vacuum drying
The vacuum mixer is a special type of mixing equipment that creates an environment devoid of air. This prevents incorporation of air into the final product and improves dispersion quality, degassing and drying processes. It also allows the heating and cooling process to occur at lower temperatures, which is important for thermally sensitive products such as pharmaceuticals.
This type of mixer is ideal for a wide range of applications, including the manufacture of gels and pastes. Mixing under a vacuum reduces oxidation, which can cause the degradation of certain ingredients and inhibits chemical reactions and microbial growth. It also allows for the creation of more consistent and dense products.
Vacuum mixing is especially useful for the emulsification of oily substances. These mixes are often difficult to mix in conventional mixing systems because of the formation of agglomerates and bubbles. In addition to reducing the number of bubbles, a vacuum mixer can increase the speed of the emulsification process.
Vac-U-Mixer is available in five sizes to meet the needs of any office or laboratory. Sturdy construction ensures trouble-free operation; all models have stainless steel paddles and shafts. Specify the size of your existing equipment when ordering so that the proper drive nuts will be supplied. The Vac-U-Spat permits spatulating and investing of inlay, crown and bridge patterns completely under vacuum, producing smooth, dense and detailed casts or impressions.