Method and apparatus for producing cheese, suitable in particular for producing crumbly cheese

Abstract: A method and apparatus for producing cheese, suitable in particular for producing crumbly cheese, wherein cheese molds are filled with curd, are subsequently closed with a lid and are pressed, whereafter the obtained cheeses are removed from the cheese molds, while prior to removing the cheeses from the cheese molds, the cheese molds still filled with cheese are heated.

Description: This invention relates to a method for producing cheese, wherein cheese molds are filled with curd, are subsequently closed with a lid and are pressed, whereafter the obtained cheeses are removed from the cheese molds. This invention further relates to an apparatus for producing cheese. A problem occurring in the production of some types of cheese is that in the traditional methods of 'unpacking' the pressed cheeses, i.e., removing them from the cheese molds, the cheese is often damaged. According to the traditional methods, the cheeses are, for instance, blown from the cheese molds using compressed air or pushed from the cheese molds using a loose bottom. The problem outlined occurs in particular in the production of the types of cheese that crumble easily. Such cheese types are usually designated by the term 'crumbly cheese'. This is a general designation for cheese types which, in particular when removing the cheeses from the cheese molds, are susceptible of mechanical damage. Examples include inter alia Lancashire cheese, Cheshire cheese, Caerphilly cheese. Such cheese types are produced in round or rectangular cheese molds, often manufactured from stainless steel. According to the traditional method, a cloth is laid in the empty molds and then the mold is filled with curd. The cloth is folded around the cheese and then the molds are brought into gang presses and pressed. No lids are placed on the molds, for the bottom of one mold functions as lid for the mold behind it. After pressing, the cheeses are cooled in a cold store for at least 7 hours, so that the cheese acquires sufficient firmness. The cheese is then carefully taken out of the mold, the cloth is peeled off, and in the case of round cheese, very carefully, a supporting wrap is fitted manually. It has been endeavored to devise a method whereby pressing in the gang presses is avoided, partly because the presses must be loaded manually. Manually unpacking and manually A method and an apparatus according to the preamble of claim 1 and claim 3, respectively, is already known from GB-A-1423958. fitting the supporting wrap also meet with objections because this procedure involves an actual risk of contamination of the cheese. For that reason, an automatic pressing system, and cheese molds suitable therefor, has been chosen. The curd is then charged to round or rectangular molds without applying cloth. The molds have lids which bear directly on the curd and which can be put under mechanical pressure in the usual manner. In this procedure, however, both removing the lid and releasing the cooled cheese by blowing proved not to be properly possible without damaging the cheese. Accordingly, there is a need for an improved unpacking method, in particular for cheese types which are susceptible to mechanical damage, whereby damage is prevented or at least the chance of damage is considerably reduced. To that end, according to the invention, a method of the above-described type is characterized in that prior to removing the cheeses from the cheese molds, the cheese molds still filled with cheese are heated. An apparatus for producing cheese comprising at least one filling station for filling the cheese molds with curd and arranging a lid on the curd in the cheese molds; at least one pressing device for pressing the cheese in the cheese molds and at least one unpacking station for removing the cheese from the cheese molds, as well as conveying means for conveying the cheese molds through the apparatus, is characterized, according to the invention, by a heating device for heating the filled cheese molds after they have left the pressing device and before they reach the unpacking station. It is noted that the invention is also applicable to cheese types, whether or not susceptible to mechanical damage, other than the cheese types specifically mentioned, as, for instance, to cheddar cheese types. In the following, the invention will be further described with reference to the accompanying drawing. The single figure shows schematically in top plan view an example of an automated cheese production line 1 which is arranged for practicing the method according to the invention. The apparatus shown comprises a curd feed conveyor 2, a mixer/blender 3, a filling station 4 in which the curd mixture provided by the mixer/blender is charged to cheese molds. This is typically done manually but in principle an automated filling station could be used. In a next station 5, each cheese mold is provided with a lid, mostly called follower. Placing the followers can again be done manually or with the aid of an automated system. Optionally, a brief prepressing step can be carried out intermediately in a prepressing station 6. The thus filled cheese molds provided with followers are then fed to a pressing device. In the example shown, three conveyors 7, 8, 9 are shown which feed the cheese molds to two pressing devices 10, 11. The pressing devices can be known per se, for instance tunnel-shaped, in which a large number of molds, for instance about 80, can be pressed simultaneously. When closed pressing devices are used, the possibility arises of conditioning the air in the pressing device. Often, a cool environment is desirable, and the air in the pressing devices is cooled to, for instance, 6°C. If desired, the cheeses, after pressing, can be cooled still longer in a refrigerated space not further shown. After pressing, the cheese molds leave the pressing devices and are conveyed by suitable conveying means, such as conveyor tracks 12, 14, to an unpacking station 15. The pressing devices in this example are arranged in the usual manner as feed-through pressing devices, the cheese molds entering the devices at one end and leaving them at the other, opposite end. If desired, however, the pressing devices can also be designed in a different manner. In the unpacking station, the pressed cheeses are taken from the cheese molds. To that end, in the example shown, first, in a station 16 the follower (the lid) is removed from each cheese mold. Next, in an inverting station 17, the cheese mold is inverted, and in a subsequent removing station 18 the cheese mold is taken off the cheese. The thus obtained cheeses are discharged via a conveyor 19 and the cheese molds and the lids are passed via suitable conveying means 20 to a rinsing machine 21 to be cleaned. After cleaning, the cheese molds and the lids can be fed to the filling station 4 again for reuse. For this purpose, schematically a conveyor track 22 is shown. In the traditional unpacking methods, use is made of compressed air to blow the cheeses out of the molds, or in the cheese molds a loose bottom is used by means of which the cheese can be pushed from a cheese mold. In practice, this gives rise to damages with some types of cheese. In a method and apparatus according to the invention, such damages are prevented by heating the cheese molds prior to unpacking. To that end, in the example shown, a heating device 23 is used, in which each cheese mold with follower and cheese is heated using hot air. The heating space is preferably, as schematically shown, a feed-through device which can be designed, for instance, as a closed tunnel. Such a tunnel can be provided with an air circulation system with ducts 24, an air heating device 25 and one or more fans 26, as schematically shown in the figure. Further, the usual control devices for temperature, air flow rate, humidity, etc., are provided. The heating device 23 in the example shown is further provided with a conveyor to carry the cheese molds through the device. The conveyor may be arranged to pass the cheese molds by steps through the heating device, but it is also possible to employ a continuously working conveyor or a conveyor which can work both continuously and by steps. Further, if desired, it is possible to provide the heating device, for instance, with successive zones in which prevail different temperatures, for instance rising from one zone to the next. The heating device may be arranged as a feed-through device to which continuously, though optionally with short intervals, groups of one or more cheese molds are fed, while simultaneously molds already heated are discharged. Alternatively, the heating device can also be filled completely with cheese molds, which are then all heated simultaneously, whereafter all molds are discharged from the heating device before the heating device is filled again. In this case, if desired, the temperature could be raised by steps during the heating process. These and similar variants will readily occur to those skilled in the art. It has been found that the cheeses, after heating of the filled cheese molds, can be simply removed from the cheese molds without damage, or at least with a considerably reduced chance of damage. If desired, when taking the molds off the cheeses, additionally blowing with compressed air at a low pressure can be effected. As an alternative to the use of heated air, other suitable heating methods can be used. For instance, infrared heaters or steam can be used. In the latter case, however, the rind of the cheese might be affected by condensed steam.

Claims: A method for producing cheese, in particular crumbly cheese, wherein cheese molds are filled with curd, are subsequently closed with a lid and are pressed, whereafter the obtained cheeses are removed from the cheese molds, characterized in that prior to removing the cheeses from the cheese molds, the cheese molds still filled with cheese are heated. A method according to claim 1, characterized in that the filled cheese molds are heated in a tunnel-shaped device. A method according to claim 1 or 2, characterized in that as a heating medium, heated air is used. A method according to any one of claims 1 to 3, characterized in that the filled cheese molds are advanced continuously or by steps during heating. A method according to any one of the preceding claims, characterized in that the cheese molds are cooled during and/or directly after pressing. An apparatus for producing cheese, comprising at least one filling station for filling the cheese molds with curd and arranging a lid on the curd in the cheese molds; at least one pressing device for pressing the cheese in the cheese molds and at least one unpacking station for removing the cheese from the cheese molds, as well as conveying means for conveying the cheese molds through the apparatus, characterized by a heating device for heating the filled cheese molds after they have left the pressing device and before they reach the unpacking station. An apparatus according to claim 6, characterized in that the heating device comprises a tunnel-shaped device, which is provided with at least one conveyor for cheese molds, extending through the tunnel, and with heating means. An apparatus according to claim 6 or 7, characterized in that the heating device is provided with air heating means and with air ducts and at least one fan for passing heated air through the heating device. An apparatus according to any one of claims 6 to 8, characterized in that the unpacking station comprises an inverting station for inverting filled cheese molds and a subsequent removing station for removing the cheese molds from the cheeses. An apparatus according to claim 8, characterized in that the removing station is provided with means for supplying, during removal, compressed air with a low pressure between a cheese mold and a cheese present therein. An apparatus according to any one of claims 6 to 10, characterized in that the pressing device is provided with means for cooling the cheese molds present in the pressing device. An apparatus according to any one of claims 6 to 11, characterized by a cooling device for cheese molds, following the pressing device.

Inventors: ACREMAN STEVEN, MENNINGA HUGO, ACREMAN, STEVEN, MENNINGA, HUGO
Applicants: TETRA LAVAL HOLDINGS & FINANCE, TETRA LAVAL HOLDINGS & FINANCE S.A.
Application year: 2001
Main classification: A01J25
IPC codes: A01J25