DE2846515A1 - COFFEE PRODUCT - Google Patents

Description

PATE Nj TA NWALTE A. GRUNECKER H. KINKELDEY

CR-INQ

W. STOCKMAIR

DR-IMl-AaE [CAUHCrt

K. SCHUMANN

DR BER NAT DW-- PHYS

P. H. JAKOB

DPL-ING

β. BEZOLD

8 MUNICH 22

MAXIMILIANSTRASSE 43

P 13 235

Oct 25, 1978

GENERAL POODS LIMITED
Eanbury, Oxon, England

Coffee product

909818/0888

TELEPHONE (O8O) 30 SS βα TELEX 0Β-3β3βΟ TELEQRAMMEMONAPAT TELECOPER description

The invention relates to a coffee product and the manufacture of such a product. The invention particularly relates to the product of a process involving roasted coffee very finely ground particle size with soluble coffee to form a coagglomerated granulate, hereinafter referred to as agglomerates is called, is deformed.

In the past there has been from time to time an interest in blends of soluble coffee at various percentages Quantities, usually less than 15% by weight, of finely ground, Passed roasted coffee. Such mixtures have the advantage that they contain the aromatic and fragrant elements of have roasted coffee, which is not readily possible in the soluble coffee part, at least then not if this is produced by a conventional spray drying process. Such mixtures are in Trade expelled from time to time. These were mixtures of soluble coffee powder and roasted and ground particles which, although homogeneously mixed, had very poor flowability and poor ' could be filled with a spoon. In addition, such products are made from roasted and ground particles which tend to settle in a broth made with milk and / or water and an undesirable one Amount of sediment to form, which is perceived as negative by the consumer. A certain amount of such sediment however, is for the consumer, for example, with home-brewed, 100% roast and ground coffee acceptable. Indeed, it is desirable for such products to be cloudy in the cup.

It has now been found that a pleasant and acceptable coffee product is obtained by using soluble coffee and finely ground, roasted coffee into agglomerates, for example

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wisely by known agglomeration processes. Such a product has been found to be highly flowable and that it contains essentially all of the original aromatic elements of the roast, ground coffee in one Maintains improvement of the aroma of the coffee product.

The invention therefore provides a coffee product made from free-flowing agglomerates. consists, which contain soluble coffee particles and finely ground, roasted coffee, the finely ground, roasted coffee In an amount of up to 20% by weight, based on the weight of the two coffee ingredients, and one The particle size is such that 90% by weight of the ground coffee passes through a 75 μm sieve. Preferably is the particle size of the finely ground coffee is less than μπι. More preferably 90% of the coffee goes through a 25 μία sieve through. It is most preferred that practically all of the coffee has a size between 5 and 20 μm Use of finely ground, roast coffee with a particle size at the lower end of the size ranges given above results in minimal sedimentation when agglomerates from such a coffee component are converted into a beverage will.

Thus, the invention provides a granular, soluble Coffee product made available that contains up to 20% (preferably about 10%) very finely ground, roasted coffee Contains (with a mean particle size of less than 50 μπι). The product is very flowable and gives minimal sedimentation in the production of beverages. The finely ground, roasted coffee is made by a Cryogenic dry grinding with classification and recycling of the oversized particles into the gas stream from the Mill manufactured. The product according to the invention differs from known products made by wet grinding and / or co-spray drying.

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Dry grinding roasted coffee beans into a relatively coarse powder is a well known process in the coffee industry. from different authors is already the fine marriage of the roasted Coffees while preserving their aromatic character by using a cryogenic grinding technique with a single Stage has been described. In such a process, the roasted coffee beans are brought to temperatures before grinding pre-cooled below IOC, as for example in the US-PS 3,261,689. Alternatively, it has also been proposed to inject liquid nitrogen into the mill during the Initiate grinding of the roasted coffee beans, as described in "Food Engineering" May 1962, pages 62 and 63. Other methods of grinding roasted coffee beans can be found in British Patents 1,424,264 and 1,476,854. However, these methods still give relatively fine grind products and they are generally unable to do so most desired mean particle size of up to 20 μm or less to deliver down. It can be seen from US Pat. No. 3,261,669 that only 50% of the ground coffee passes through a sieve go through with a mesh size of 74 μm. GB-PS 1 476 854 shows that the ground coffee is not finer than 210 μπι was. It is further noted that the general The procedure according to these documents consists in converting such ground products into liquid coffee extract suspend and then spray dry. This level of However, spray drying inevitably leads to a loss of volatile components and results in products that have a certain Have fluidity problems.

The methods described above were not able to to provide a satisfactory, small-sized, roasted coffee product. It was also not possible to have such a product to mix with conventional soluble coffee in such a way that a flowable and fragrant product is obtained.

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When carrying out the invention, the fine distribution of the roasted coffee beans is expediently accomplished by a grinding process / which both the application of a pre-cooling of the roasted coffee beans to below 0 ⁰ C and preferably below -45 ° C and the application of an air classification of the finely ground, roasted coffee ess using chilled air in the classification stage. The pre-cooling is preferably carried out with liquid nitrogen, so that the cooled gases in the classification stage contain nitrogen and air in a mixture. The fine distribution of the roasted coffee beans can be accomplished using a hammer mill which has a device for air classification which allows only ground coffee with the required particle size to leave the mill as a product. The air classification system can, however, be arranged outside the mill, with the coarser fraction being sent back into the mill. Other means of obtaining the required particle size of the finely ground roast coffee with an acceptable, minimal loss of volatile components can also be used. Although not preferred, a grinding process without a liquid coolant can also be used to yield the finely ground roast coffee.

According to the invention, the finely ground, roasted coffee is formed into agglomerates with soluble coffee. When soluble coffee is preferably one having a mean particle size of less than 50 microns. The two coffee constituents are mixed with one another to form an essentially homogeneous mixture and then coagglomerated, whereby the agglomerates according to the invention are obtained. Agglomeration can be accomplished in a variety of ways. However, it is preferably effected according to the procedures described in GB-PS 1,224,807. In

909818/0883

this patent also describes the pre-grinding of the soluble coffee, which is a convenient stage of the present invention Invention is.

The agglomerates according to the invention can be 5 to 20% by weight roasted and finely ground coffee, preferably 8 to 12% by weight. If desired, part of the inherent Coffee oil from the finely ground, roasted coffee before the grinding stage and before the formation of the invention Agglomerates are removed. Techniques suitable for this are well known to the person skilled in the art.

Preferably the agglomerates of the coffee product according to the invention have an average particle size of more than 850 μm, more preferably between 1200 and 2400 μm.

End of description.

909818/0888

Claims (13)

PATENVAWALTE A. GRÜNECKER DlPU-ING H. KlNKELDEY DH-HUG W. STOCKMAIR DR-ING - AeCtCALTECH K. SCHUMANN, OR PER N * T CWL-PHYS PH JAKOB OtPt-- ING G. BEZOLD CR PEHIWT OPL-CKM 8 MUNICH 22 MAXIMILIANSTRASSE - »3 P 13 235 claims 1. Coffee product, characterized in that it consists of free-flowing Agglomerates, which contain soluble coffee particles and finely ground, roasted coffee, whereby the finely ground, roast coffee is present in an amount of 2 to 20 weight percent based on the weight of the two coffee ingredients and has a particle size such that 90% by weight of the ground coffee pass through a sieve with 75 μm. 2. Coffee product according to claim 1, characterized in that the finely ground, roast coffee has a particle size of less than 50 μΐη has. 3. Coffee product according to claim 2, characterized in that The finely ground, roasted coffee has such a particle size that 90% by weight of the ground coffee through a sieve with μπι go through. 4. Coffee product according to claim 3, characterized in that the finely ground, roasted coffee has such a particle size has that practically all of the coffee has a size between 5 and 20 μπι. 5. Coffee product according to one of the preceding claims, characterized in that roasted coffee beans in a sol- 909818/0888 (eyelet) aaamea telex oa-aoaao teleqramme monapat telecopier in a very fine way that the aromatic character of the coffee has been preserved. 6. Coffee product according to claim 5, characterized in that the roasted coffee beans to a temperature before grinding have been pre-cooled below -45 C. 7. Coffee product according to one of the preceding claims, characterized in that the finely ground, roasted coffee with the desired particle size has been selected by means of an air classification step. 8. Coffee product according to one of claims 1 to 6, characterized in that that the finely ground, roasted coffee means a hammer mill has been produced, which is equipped with a device for air classification, which only the ground Coffee that has the required particle size leaves the mill as a product. 9. Coffee product according to one of the preceding claims, characterized in that the agglomerates containing soluble Coffee particles and finely ground roast coffee using the methods described in GB-PS 1,224,807 have been manufactured. 10. Coffee product according to one of the preceding claims, characterized characterized in that the agglomerates 8 to 12 wt.% finely ground, Contains roasted coffee. 11. Coffee product according to one of the preceding claims, characterized characterized in that at least 65% by weight of the agglomerates have an average particle size of more than 850 µm. 12. Coffee product according to claim 11, characterized in that the agglomerates have a mean particle size of more than 850 μm to have. qnoa1R / Q888 13. Coffee product according to claim 12, characterized in that the mean particle size of the agglomerates is between 1200 and 2400 \ im . 909818/0888