METHOD AND APPARATUS FOR WASHING EGGS

Abstract: A method and an apparatus for washing eggs intended for hatching with which the eggshells are stripped of dirt contaminated with infection causing bacteria, said eggs (15) being positioned in an open device (4,5,14) through which liquid can flow and which can rotate around an axis in a washing drum (2) under specific conditions in a liquid, usually water, to which a soap solution is added and which water is maintained at a temperature between 32° and 52°C. After termination of the washing treatment the liquid is removed out of the device (4,5,14) with the eggs, and the device continues to rotate for some time in a dry environ­ ment.

Description: Method and apparatus for washing eggs. The invention relates to a method and an apparatus for washing eggs, with which the eggshells are stripped as much as possible of dirt contaminated with infection causing bacteria, indicated with the so called germination number. Especially for eggs which are intended for hatching it is of importance that the eggshells are as clean as possible, so that during continued hatching of the eggs no bacteria may penetrate through the eggshells and the chickens go lost by infection. In the known method and apparatus for washing and in case of the required disinfection of hatch-eggs without washing with water a basket with eggs is placed into an egg treatment apparatus. In case of washing with water the water in the egg-washer rinses for a specific time between the eggs in the basket, by which in a very irregular manner the dirt on the eggs in the basket is dislodged. When doing this a disinfectant,such as formalin, is required to make the germination number on the eggshells in the dirty water of the egg-washer somewhat acceptable after removal of the basket with eggs out of the water. The disinfectant formalin is prohibited in a number of countries with a view to the cancerogenous properties thereof. A disadvantage of the known apparatus further is that the egg-baskets have to be charged with eggs for a wash treatment and later on have to be discharged again and the eggs are present in the dirty water in the egg-washer during the complete washing process till they are removed out of the water. The invention intends to provide an improved method and apparatus with which the above disadvantages do not occur, and in which the use of formalin is not required. To that end the invention provides a method, which is characterized in that the eggs are positioned in an open device through which liquid can flow and which can rotate around an axis in a washing drum under specific conditions in a liquid, usually water, to which a soap solution is added, with which after termination of the washing treatment the liquid is removed out of the device with the eggs, and the device continues to rotate for some time in a dry environment. Additional advantages are that the eggs are properly washed and the water is separated from the eggs prior to the termination of the rotation, and that the residues of dirt are spun from the eggs together with the water and that no separate disinfectant is required. According to a preferred embodiment it is provided that the washing drum is filled up with water up to a specific level, that the water and a soap solution are brought to the desired temperature whereafter the washing process takes place and that subsequently the water is pumped off and the device continues to rotate for another 1 to 2 minutes. The advantages hereof are that more hatch-eggs will produce a chicken than is the case with the customary washing methods. Also no soap solution and washwater can penetrate through the shell of the eggs as no temperature changes occur of the egg and the yolk by heating the washing liquid prior to the introduction of the eggs. Thus no transport of washwater and noxious disinfectant will occur through the eggshell. Preferably the method is carried out in such a manner that the speed of rotation of the device is between 20 and 50 rotations per minute, preferably between 33 and 37 rotations per minute. The advantage hereof is, that the cords between yolk and eggshell are only subjected to a permissible load. Preferably further the method is carried out such that 0 the water is maintained at a temperature between 32 and 520C, preferably between 430 and 450C. The advantage of this is that the temperature of the washwater is adapted to the temperature of the yolk so that no tempering effect occurs by temperature fluctuations. In addition the method is preferably carried out in such a manner that the washing time is between 3 and 12 minutes, preferably between 4 and 6 minutes. It has appeared from tests, that in this way the dirt with contamination is dislodged from the eggshell in a sufficient way and is washed away. For the application of the above method the invention provides an apparatus, which is characterized in that it comprises an outer frame provided with a lid, and an inner frame to be positioned within this outer frame, said inner frame serving to accept platforms onto which the eggs to be washed can be stacked, said platforms being provided with openings for the passage of washing liquid, the upper eggs containing platform being covered by an empty platform, the outer frame being provided with means for rotatable positioning of it in a washing drum to which washing liquid can be supplied. The advantages of this are that the eggs are properly washed in the longitudinal direction and the centrifugal forces also can act in the longitudinal direction of the eggs so that the cords between egg yolk and top and egg yolk and basis of the inner shell are loaded as favourable as possible. further elaboration of the apparatus consists therein, that the inner frame consists of an open grate-like bottom with two open upright sides, the edges of which are formed of steel sections, two opposing handles being mounted at the upper edge of said upright sides. The advantages hereof are, that the platforms with eggs can easily be positioned in an inner frame and that a number of inner frames may be provided already with platforms with collected eggs, and that further the flow through the assembling is maximum and less material is used. Further the elaboration of the apparatus is such that the outer frame consists of an open structure the edges of which are equally formed of steel sections, the means for positioning the outer frame into the washing drum being provided at the outside of two vertical sides and the upper edges of two opposing vertical sides being adapted to keep the handles of the inner frame free. The advantages hereof are, that the construction has optimal through-flow and less material is used and that the centrifugal forces during the washing process act in the longitudinal direction of the eggs, which, as stated above, is as favourable as possible for the suspension of the yolk. Further the apparatus has been elaborated in such a manner, that the apparatus is of a corrosion resistant material. The advantage hereof being that the costs for maintenance are minimal. For elucidation of the invention an example will be described with reference to the drawing, In the drawing: Fig. 1 shows a perspective view of the automatic washing apparatus with the washing drum into which the device according to the invention can be positioned; Fig. 2 shows a perspective view of some platforms with eggs, positioned in an inner frame; Fig. 3 shows a cross-section along the line III-III of Fig. 2; Fig. 4 shows a perspective view of the inner frame of the device; Fig. 5 shows a perspective view of the outer frame of the device; Fig. 6 shows the control diagram of the apparatus. The automatic apparatus represented in Fig. 1 comprises the house 1 with the washing drum 2 in it, in which the device 3 (see Fig. 3) can be positioned, consisting of an inner frame 4 (see Fig. 4) and an outer frame 5 (see Fig. 5). To that end the lid 6 should be opened far enough. The outer frame 5 (see Fig. 5) rests with the trunnion 7 in the support 8 on one of the inner walls of the washing drum and with an engaging means 9 in the groove of a rotating disk 30 on the opposing inner wall of the washing drum 2. The rotating disk 10 is driven by a motor 11. The control device 12 of the washing apparatus consists of various button-switches. The various signals may be light signals 13. In Fig. 2 the eggs 15 have been placed on the platforms 14. In a platform 14 are sufficient openings 16 for through-flow. The platforms 14 rest on each other with the ridges 17 and the perforated prctrusions 18, so that the eggs can still move somewhat and so have no supporting function. It will be seen from Fig. 3 that from two successive platforms 14 the protrusions 18 are staggered by turning the platforms each time over an angle of 900 in such a way that the subsequent row of eggs 15 are comprised between the row of eggs therebelow. This provides advantages with respect to the height of the stacking. So with the platforms as described it is possible to stack six platforms 14 each with thirty eggs 15, thus allowing to treat 6 x 30 = 180 eggs in one washing cycle. Depending on the dimensions of the platforms to be used a smaller or larger number of eggs may be treated in one cycle. The dimensions of the washing apparatus may be adapted accordingly without departing from the inventive concept. In Fig. 4 the inner frame 4 is represented in a perspective view. The inner frame 4 has an open bottom plane the edges of which consists of angle steels 19, between ollich wicker-work 20 of wire has been positioned. Also trips can be positioned appropriately in correspondence with the platforms. The edges 21 for guiding the egg platforms 14 may also consist of angle steels or bent plates. The upper ends of the edges 21 are connected with each other by a strip 22. A handle 24 is mounted to an upwardly extending strip 23. It is also possible to elongate the edges 21 and to provide the strip 22 between the ends, said strip being rounded off at the location of the handle. The inner frame 4 of Fig. 4 slides with some play in the outer frame 5 of Fig. 5. In Fig. 5 the bottom edges 25 and the upright edges 26 may consist as well of angle steels. At the upper end these upright edges 26 are connected with each other by the sections 27, 28. The sections 27 are shaped in such a way, that the handles 24 of the inner frame 4 can easily be grasped when positioning the inner frame 4 into the outer frame 5. The trunnion 7 has been discussed already with Fig. 1. The engaging means is formed by a housing 9 which is open at the bottom side and can be closed off with a strip with bolts and is provided with a boundary plate at the inner side of the outer frame in order to keep the outer frame free from the drum of the washing machine during the washing treatment. The trunnion 7 and the housing 9 serve for positioning the device in the washing drum 2. The outer frame 5 can be closed off with an open lid consisting of suitable sections, such as for example square tube sections 30. The lid may turn for example around the one edge 28 by means of hinges 31 and be connected with the other edge 28 by means of a snap lock 32. A possible control diagram for the automatic washing apparatus is represented in Fig. 6.

Claims: -Claims- 1. Method for washing gigs, with which the eggshells are stripped as much as possible of dirt contaminated with infection causing bacteria, indicated with the so called germination number, characterized in that the eggs (15) are positioned in an open device (4,5) through which liquid can flow and which can rotate around an axis in a washing drum (2) under specific conditions in a liquid, usually water, to which a soap solution is added, with which after termination of the washing treatment the liquid is removed out of the device (4,5) with the eggs (15) and the device continues to rotate for some time in a dry environment. 2. Method according to claim 1, characterized in that the washing drum (2) is filled up with water up to a specific level, that the water and a soap solution are brought to the desired temperature whereafter the washing process takes place and that subsequently the water is pumped off and the device (4,5) continues to rotate for another 1 to 2 minutes. 3. Method according to claim 1 or 2, characterized in that the speed of rotation of the device (4,5) is between 20 and 50 rotations per minute. 4. Method according to claim 3, characterized in that the speed of rotation of the device (4,5) is between 33 and 37 rotations per minute. 5. Method according to one of the preceding claims, characterized in that the water is maintained at a temperature between 320 and 520C. 6. Method according to claim 5, w V V characterized in that the water is maintained at a temperature between 0 43 and 45 C. 7. Method according to one of the preceding claims, characterized in that the washing time is between 3 and 12 minutes. 8. Method according to claim 7, characterized in that the washing time is between 4 and 6 minutes. 9. Apparatus for applying the method according to one of the preceding claims, characterized in that the apparatus comprises an outer frame (5) provided with a lid (6), and an inner frame (4) to be positioned within this outer frame (5), said inner frame (4) serving to accept platforms (14) onto which the eggs (15) to be washed can be stacked, said platforms (14) being provided with openings for the passage of washing liquid,the upper eggs containing platform (14) being covered by an empty platform (14), the outer frame (5) being provided with means (7,9) for rotatable positioning of it in a washing drum (2) to which washing liquid can be supplied. 10. Apparatus according to claim 9, characterized in that the inner frame (4) consists of an open grate-like bottom (19,20) with two open upright sides, the edges (21) of which are formed of steel sections, two opposing handles (24) being mounted at the upper edge of said upright sides. 11. Apparatus according to one of the claims 9 - 10, characterized in that the outer frame (5) consists of an open structure the edges of which are equally formed of steel sections (26,27,28), the means (7,9) for positioning the outer frame (5) into the washing drum (2) being provided at the outside of two vertical sides and the upper edges of two opposing vertical sides being adapted to keep the handles of the inner frame free. 12. Apparatus according to one of the claims 9 - 11, characterized in that the apparatus is of a corrosion resistant material.

Inventors: VAN DER AVOIRD, JOHANNES
Applicants: VAN DER AVOIRD, JOHANNES
Application year: 1985
Main classification: A01K43
IPC codes: A01K43