METHOD AND DEVICE FOR PROCESSING CHOCOLATE MASS

Abstract: Chocolate is ground in order to obtain a very small average particle size. A determined viscosity is necessary for further processing. In order to keep as small as possible the fraction with particle size lying above the desired value and having an adverse effect on the taste of the final product according to the invention the process mass is circulated by a pump (2) in a circuit incorporating a grinding device (1) and a ball mill (3). This has the result of accelerating the grinding process and reducing the inconsistency in the distribution of the particle size.

Description: The invention relates to a method and device for mixing and grinding chocolate, fats or the like, wherein a process mass of cacao and/or cacao powder, cacao butter, edible fat, sugar and the like are pre-mixed and ground in a grinding device and a ball mill. Up until the present the components for processing were pre-mixed in a pre-mixer and ground in a grinding device (NL-A-163708). The pre-mixer and grinding device can also be unified to one unit (EP-A-0157454). After grinding the mass is then ground in a ball mill to make it still finer as required until the final desired particle size is obtained. In a ball mill it is possible to grind the process mass to a very small average particle size and to therein obtain the desired viscosity, although the uniformity in the distribution of the particle size leaves something to be desired. Unless grinding continues to a very small particle size, which is very time-consuming and moreover produces an adverse viscosity value, it can occur that the process mass still has a fraction with particle sizes lying far above the desired value. Such a fraction has an adverse effect on the taste of the final product. It is the object of the invention to accelerate the grinding process and obtain a better end product. This is achieved according to the invention in that as grinding device is chosen a device for reducing to a certain particle size with a largely uniform distribution of the particle size in the process mass and the process mass is circulated in a cycle consisting at least of the grinding device and the ball mill and is ground to the desired particle size. Through use of the method according to the invention the particles are reduced to a certain size in the selected grinding device, wherein a large degree of uniformity is achieved. With such a grinding device a limited particle size is reached relatively rapidly, although these particles are still too large for processing as chocolate. A ball mill has the greatest efficiency in grinding at smaller particle sizes. Owing to the circulation process the selected grinding device and the ball mill are therefore optimally used, whereby in a short time a process mass is obtained whereof the particle size meets the requirements set for processing as chocolate, and wherein the particle size distribution has only a small inconsistency. The viscosity and flow point of the end product are considerably better than in grinding to the desired particle size in only the ball mill, since, as stated in the foregoing, the presence of large particles can then only be prevented when grinding continues to a very small particle size. It is also possible to pre-mix and grind in the grinding device until an average desired particle size is obtained and only thereafter to continue the grinding process in the above described cycle. The grinding process in the cycle can for instance be started when the average particle size of the process mass has reached approximately 80 M. Also in this case are the above stated advantages achieved. A taste-changer is preferably also incorporated in the cycle. The mass is circulated using a pump. It is also possible to pre-mix the process mass in the grinding device, which takes place while the mass is already being ground. The method according to the invention can be performed using a device formed by a cycle consisting of a grinding device, a ball mill connected to the grinding device, a taste-changer connected to the grinding device and the ball mill and a pump for circulating the chocolate mass. The invention is elucidated with reference to a diagram. Figure 1 shows an arrangement of the grinding device and the ball mill, and figure 2 shows an alternative arrangement. Designated in the drawings with the reference numeral 1 is a grinding device in which the components of the process mass for processing are pre-mixed and ground. Using the pump 2 the process mass can be circulated in the cycle. Pump 2 circulates the process mass to a ball mill 3 which is connected with its outlet via a taste-changer 4 to the intake of the grinding device 1. The components for mixing and grinding are introduced into the unit 1 through the in-feed 5 and the finished process mass is discharged via the line 6 from the cycle when the desired particle size is reached. After mixing in the unit 1 the mass can be carried immediately into the cycle by opening valves (not drawn) and while circulating be then ground successively in the grinding device 1 and the ball mill 3. It is also possible to introduce the mass into the cycle only after mixing when a desired average particle size has been reached in the grinding device 1. The by-pass line 7 can be opened as desired using the three-way valves 8, 9. In this way that run in the cycle can be selected that is the most suitable for processing the process mass. The arrangement of figure 2 varies from the arrangement of figure 1 in the sense that the process mass is carried in the other direction through the ball mill 3.

Claims: Method for mixing and grinding chocolate, fats or the like, wherein a process mass of cacao and/or cacao powder, cacao butter, edible fat, sugar and the like are pre-mixed and ground in a grinding device and a ball mill, characterized in that as grinding device is chosen a device for reducing the process mass to a certain particle size with a largely uniform particle size distribution and that the process mass is circulated in a cycle at least consisting of the grinding device and a separate ball mill and is ground to the desired particle size. Method as claimed in claim 1, characterized in that a taste-changer is additionally incorporated in the cycle. Method as claimed in claims 1-2, characterized in that the process mass is pre-mixed in the grinding device. Method as claimed in claims 1-3, characterized in that after pre-mixing the process mass is first ground in the grinding device to a desired particle size and is thereafter brought into circulation in the cycle. Method as claimed in claim 4, characterized in that the process mass is ground in the grinding device until a particle size of 80 M is reached. Method as claimed in claims 1-5, characterized in that a grinding device is used consisting of a cylindrical envelope, a rotor with rotor blades arranged rotatably therein and means for controlling the temperature and the pressure applied to the mass. Installation for performing the method as claimed in claims 1-6, formed by a grinding device (1), a separate ball mill (3) connected to the grinding device, a taste-changer (4) connected to the grinding device and the ball mill positioned in a cycle and a pump (2) for circulating the process mass around the installation. Installation as claimed in claim 7, characterized in that the grinding device can be connected at choice to the one or other side of the ball mill. Installation as claimed in claims 7-8, characterized in that means are arranged for shortening the cycle.

Inventors: TADEMA JAN CORNELIS, TADEMA, JAN CORNELIS
Applicants: WIENER & CO APPARATENBOUW BV, WIENER & CO. APPARATENBOUW B.V.
Application year: 1991
Main classification: A23G1
IPC codes: A23G1