CA1174407A - Method and apparatus for depilating slaughtered livestock - Google Patents
Method and apparatus for depilating slaughtered livestockInfo
- Publication number
- CA1174407A CA1174407A CA000380213A CA380213A CA1174407A CA 1174407 A CA1174407 A CA 1174407A CA 000380213 A CA000380213 A CA 000380213A CA 380213 A CA380213 A CA 380213A CA 1174407 A CA1174407 A CA 1174407A
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- Canada
- Prior art keywords
- carcass
- burner
- burners
- grate
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ABSTRACT
The present invention relates to a method and an apparatus for depilating slaughtered livestock. The carcass is subjected to a warm water treatment and then roughly de-pilated by means of beating and scraping tools while simul-taneously being rotated about its longitudinal axis. The remaining fine hairs are removed using burner means over the entire carcass which act on various zones of the carcass with differences in operating time and or intensity.
The present invention relates to a method and an apparatus for depilating slaughtered livestock. The carcass is subjected to a warm water treatment and then roughly de-pilated by means of beating and scraping tools while simul-taneously being rotated about its longitudinal axis. The remaining fine hairs are removed using burner means over the entire carcass which act on various zones of the carcass with differences in operating time and or intensity.
Description
7~
This in~ention relates to a method ~or depilating slaughtered livestock, especially pigs, whereby the carcass is first of all subjected to a warm water treatment, then roughly depilated by means of beating and scraping tools while simultan-eously being rotated about its longitudinal axis, and after com-pletion of this rough depilating process the remaining fine hairs are removed using a burner.
Such a method is known ~rom German Patent 20.47.323. In this method, in order to shorten the depilating period, the carcass is flamed over its entire length during the rough depilating pro-cess carried out by the beating and scraping means. This is based on the idea that the heat of the flame causes the hairs to be erected thereby facilitating the removal of hairs rom the skin using the beating and scraping means. ~lowever, practice has shown that such use of a flame generally shortens the hairs to an extent that they can no longer be removed from the skin by the beating and scraping means. Accordingly, an increased volume of hairs has to be burnt away and therefore a much greater volume of hair residue than is desirable will remain in the skin.
It is known in the prior art to ~irst remove the long hairs completely using beating and scraping means, i.e. carrying out a complete rough depilating process and to then remove the remaining fine hairs using a hand operated burner.
The method of German Patent 20.47.323 resu]ts on the one hand in a time saving in relation to the last mentioned method.
On the othe~ hand~ ho~eYex~ it results in a decrease in quality, .~ ~
~:~74~
because not only more hair residues than are desirable remain in the skin, but also the constant flame intensity over the entire length of the carcass will result in local overheating. It is more difficult to depilate the head section of a pig than the belly section and therefore the use of a flame jet extending over the entire length of the carcass (taking into account the fact that depilating the head portion is more dif-ficult and that more hair than after complete rough depilating has to be burnt) will cause the belly section to split because of overheating.
According to the present invention there is provided a method for depilatingslaùghtered livestock comprising: subjecting the carcass to a warm water treatment; roughly depilating the carcass by means of beating and scraping tools while simultaneously rotating the carcass about its horizontal longitudinal axis; and removing the remaining fine hairs using burner means operative over the entire carcass while rotation of the carcass is continued, said burner means acting on various zones of the carcass with differences in operating time and/or intensity.
The invention is thus based on the idea, which is in it-self known from German Offenlegungsschrift 12.98.894, that it is preferable for the carcass to be roughly depilated completely using mechanical beating and scraping means, because in that case the majority of the hairs are removed from the skin, so that no residues remain.
Furthermore, the knowledge that it is possible to remove the remaining ~ine hairs using a burner plays a part in the in-7~. vention. In the prior art, it is known to remove the ~ine hairs 7~ 7 after the rough depilating process using ~ hand operated burner.
Such treatment however is very arbitrary and is either insufficien-t or results in local overheating. The person carrying out this treatment is not able to see exactly what he is doing during the burning process and is only able to see rom the resul-t that he has to do more or that he has overdone it. If he has overdone it the damage is beyond remedy. Since according to the invention the operating time and/or the intensity of the burners acting on different sections of the body are adapted to the local circum-stances, the possible damage which may be caused in using handburners will be avoided. Removing hairs from the head portion is more difficult than removing hairs from the tail portion which in turn is more difficult than removing hairs from the belly or central portion. Accordingly, one may use burners of equal flame intensity but which are controlled to operate during varying time periods or one may use burners of different flame strength.
Experiments, carried out on a certain type of animal, will give -data about the desired operating time and/or flame intensity and parameters can be maintained continuously without the possibility of human error.
According to one embodiment of the invention a carcass is treated with at least one burner which is pivotable around a fixed shaft and is controllable such that the flame affects both ends of the carcass with greater intensity or acts on both ends of the carcass longer than on the central portion of the carcass. In this e~b~d,iment, a,t ~o~h end~ o~ the sWinging movement, that is, ~,~, .,., ,.o.i.
~7'~ 7 where the direction o~ moveMent is xevexsed, e~ther the intensity of the flame should be increased or the operating time of the burners should be increased.
It ls also possible to use two pivotiny burners, one for the front half o~ the carcass and one for the rear half. Such burners would reverse their swinging movements near the central portion of the cascass ~aster than at the reversing points near the end portions of the carcass.
According to another embodimentl one uses a burner which is movable parallel to the longitudinal axis of the body. The burner is moved bac~ and forth with such a ~7arying speed that the flame action time at the head and tail portions of the carcass is longer than the action time at the central portion of the carcass.
The nature of the movement of the burner will cause it to act more intensively at the end portions of the animal in comparison to the central portion. However, one may also increase the flame strength near the reversing points of the movement.
According to a further embodiment of the invention, a plurality o~ stationary burners are used and separate burners or groups of burners are controlled by a timer or are arranged to function with different intensity.
- For removing the fine hairs on the head portion usually five or six rotations of the carcass are necessary. For the tail portion, four to five rotations are necessary and for the central portion three or four. Variation in operating time or flame ~ntensity ~here~Q~e xe~s~ul~s ~n enexg~ ~avings.
~7~17 According to another aspect of the lnvention there is provided an apparatus ~or depilatin~ slaughtered livestock com-prising: a grate or supporting a carcassj a drive shaft arranged underneath said grate and supporting beating and scraping tools such that they extend through said grate between bars of said grate; burner means arranged above said grate; and control means ~or controlling said burner means so as to act on various zones of the carcass with differences in operating time and/or intensity.
The apparatus may comprise one burner which is pivotable about a horizontal axis transverse to the axis of the drive shaft.
The burner pivots about a fixed point and is controlled by control mechanisms, which are known, so that the flame action has the desired effect on the different portions of the carcass.
Alternatively, one could use two separate pivotable burners which operate on the fr~nt and rear halves of the body respectively.
According to a another embodiment a guide rail supporting a burner is installed above the grate. The burner is movable back and forth along a path parallel to the axis of the drive shaft and is controlled so that it operates longex on the head and tail portions than on the central portion. Because of the nature of the movement, the burner will operate longer at the reversing positions than in the centra~ section. If necessary, one could also vary the speed of the burner. Furthermore, one could increase the intensity of the flame at the end portions of the carcass, for lnstance( b~ us~n~ an o~exatin~ lever of a gas valve cooperating 3~p~7~Lfait~9 with a tenslon element W~ich would bring the lever back into the initial position by means of spxing pressure.
~ ccording to a further embodiment, one may use stationary burners functioning with varying pressures and/or varying openings or Lunctioning during varying operating times determined by a timer. It is for instance possible to first start the burners operatin~ on the head section and approximately one rotation later open the gas supply to the bllrners operating on the rear section and again one rotation later starting the burners operating on the central section. All burners can be closed simultaneously.
The inven-tion will be explained in more detail with reerence to the drawings.
Figure 1 illustrates schematically a front view of a first embodiment of a system according to the invention.
Figure 2 illustrates schematically a side view of the system according to Figure 1.
Figure 3 shows also schematically a front view of another embodiment.
Figure ~ shows schematically a side view o~ the embodiment o~ Figure 3.
Figure 5 shows schematically a front view of another embodiment.
Figures 6 and 7 show front views of embodiments with stationary burners.
The system shown in Figures 1 and 2 comprises a frame 1 supporting a sha$t 2 ha,Ying flexible beating and scraping means 3.
3L~74~7 Frame 1 carries a grate 5 consistin~ of bars, the central part of which is bent downwards at 4 to ~orm a pit for receiving khe carcass of a pig.
The beating and scraping means are in the form of rods and are able to move between the bars of the grates during their rotation in the direction of arrow 7. ~ second grate 9 with curved bars extends from the grate 5 upwards such that the carcass is supported by the bars of grate 5 and the bars of grate 9 and is rotated by the beating and scraping means. This is a known technique which is discussed for instance in German Patent 20~37 323. A further grate 8 is adapted to guide the carcass into the system. In the upper part of the frame, a rail track 12 carries a movable burner 11 having a flame mouthpiece 10. The burner is moved back and forth by means o~ an electric motor 13 which may, for instance, drive the burner 11 by means of a chain or a threaded spindle. The flame 14 is directed downwards. If the burner 10, 11 is driven with constant speed, the deceleration and acceleration during the reversing of direction at the ends of the rail track 12 will result in a prolonged flame effect at th~se~positions.
Figure 1 shows a burner near both end positions.
In the embodiments of Figures 3 and 4, two burners 15 and 16 are rotatably carried on transversal axes 18 and 19. Flames 20 acting on the area covered by burners 15, 16, as shown in Figure 3 can be controlled such that they act in the illustrated end position fo~ a lon~er pe~iod than in the non-illustrated other ~'7' end position. ~ns~ead of opposed swinging movements/ the burners may moYe synchronously so that the ~lames remain parallel in all circumstances. ~n that case one avoids overlapping of the flames of both burners in the central area.
Figure 5 shows an embodiment having only one burner 21, which may swing around a centrally positioned shaft 23. The shaft can be driven such that the flames 25 act longer at the reversing points of the swinging movement (at which point the flames are at the greatest distance from the carcass) than in the central area and pass the central area at increased speed. Such a ~ovement may be controlled using known ~means, for instance cam elements or eccentric elements.
In the embodiment o~ Figure 6, a series of stationary burners are divided into a first group 26, a second group 27 and a third group 28. All the burners are connected to a gas pipe 29 having a main stop cock 30, a stop cock 31 on branch 32 shunting the central group of burners 28 and a stop cock 33. All the stop cocks can be controlled by time control mechanisms, which are themselves known/ such that first of all the stop cock 30 will be opened activating the burners 26, whereafter the stop cock 31 will be opened activating the burners 27 and thereafter the stop cock 33 will be opened for the burners 28, whereafter all the stop cocks will be closed simultaneously.
Of course it is also possible to close the stop cocks at di~ferent times.
F~u~e 7 s.ho~w~s a yariant o~ the embodiment oE Figure 6, ~, . ",~
~L~ 74gL~
which variant comprises three grou~s of bu~ners, 34, 35, 36 all connected to the same gas pipe 37 With stop cock 3g. The burners 35 have the smallest mouthpiece diameter, the burners of the group 36 have a somewhat larger mouthpiece diameter and the burners of the group 34 have the largest mouthpiece diameter~ The 1ame strength is therefore adapted to the local circumstances.
In general, when one is depilating slaughtered livestock, especially pigs, in a production line the dimensions of the animals do not vary significantly. Skin and hair characteristics are also in general comparable.
Some production lines treat and depilate 500 to 1000 pigs per hour. With such large production numbers and the very short period of time that each carcass spends in the depilating machine, the continuous maintenance of fixed parameters for the process in which the fine hairs are removed by means of flames is of extremely great significance. This is for the first time completely possible with the method and system according to the invention thereby avoiding a local decrease in the quality of the meat.
~::
This in~ention relates to a method ~or depilating slaughtered livestock, especially pigs, whereby the carcass is first of all subjected to a warm water treatment, then roughly depilated by means of beating and scraping tools while simultan-eously being rotated about its longitudinal axis, and after com-pletion of this rough depilating process the remaining fine hairs are removed using a burner.
Such a method is known ~rom German Patent 20.47.323. In this method, in order to shorten the depilating period, the carcass is flamed over its entire length during the rough depilating pro-cess carried out by the beating and scraping means. This is based on the idea that the heat of the flame causes the hairs to be erected thereby facilitating the removal of hairs rom the skin using the beating and scraping means. ~lowever, practice has shown that such use of a flame generally shortens the hairs to an extent that they can no longer be removed from the skin by the beating and scraping means. Accordingly, an increased volume of hairs has to be burnt away and therefore a much greater volume of hair residue than is desirable will remain in the skin.
It is known in the prior art to ~irst remove the long hairs completely using beating and scraping means, i.e. carrying out a complete rough depilating process and to then remove the remaining fine hairs using a hand operated burner.
The method of German Patent 20.47.323 resu]ts on the one hand in a time saving in relation to the last mentioned method.
On the othe~ hand~ ho~eYex~ it results in a decrease in quality, .~ ~
~:~74~
because not only more hair residues than are desirable remain in the skin, but also the constant flame intensity over the entire length of the carcass will result in local overheating. It is more difficult to depilate the head section of a pig than the belly section and therefore the use of a flame jet extending over the entire length of the carcass (taking into account the fact that depilating the head portion is more dif-ficult and that more hair than after complete rough depilating has to be burnt) will cause the belly section to split because of overheating.
According to the present invention there is provided a method for depilatingslaùghtered livestock comprising: subjecting the carcass to a warm water treatment; roughly depilating the carcass by means of beating and scraping tools while simultaneously rotating the carcass about its horizontal longitudinal axis; and removing the remaining fine hairs using burner means operative over the entire carcass while rotation of the carcass is continued, said burner means acting on various zones of the carcass with differences in operating time and/or intensity.
The invention is thus based on the idea, which is in it-self known from German Offenlegungsschrift 12.98.894, that it is preferable for the carcass to be roughly depilated completely using mechanical beating and scraping means, because in that case the majority of the hairs are removed from the skin, so that no residues remain.
Furthermore, the knowledge that it is possible to remove the remaining ~ine hairs using a burner plays a part in the in-7~. vention. In the prior art, it is known to remove the ~ine hairs 7~ 7 after the rough depilating process using ~ hand operated burner.
Such treatment however is very arbitrary and is either insufficien-t or results in local overheating. The person carrying out this treatment is not able to see exactly what he is doing during the burning process and is only able to see rom the resul-t that he has to do more or that he has overdone it. If he has overdone it the damage is beyond remedy. Since according to the invention the operating time and/or the intensity of the burners acting on different sections of the body are adapted to the local circum-stances, the possible damage which may be caused in using handburners will be avoided. Removing hairs from the head portion is more difficult than removing hairs from the tail portion which in turn is more difficult than removing hairs from the belly or central portion. Accordingly, one may use burners of equal flame intensity but which are controlled to operate during varying time periods or one may use burners of different flame strength.
Experiments, carried out on a certain type of animal, will give -data about the desired operating time and/or flame intensity and parameters can be maintained continuously without the possibility of human error.
According to one embodiment of the invention a carcass is treated with at least one burner which is pivotable around a fixed shaft and is controllable such that the flame affects both ends of the carcass with greater intensity or acts on both ends of the carcass longer than on the central portion of the carcass. In this e~b~d,iment, a,t ~o~h end~ o~ the sWinging movement, that is, ~,~, .,., ,.o.i.
~7'~ 7 where the direction o~ moveMent is xevexsed, e~ther the intensity of the flame should be increased or the operating time of the burners should be increased.
It ls also possible to use two pivotiny burners, one for the front half o~ the carcass and one for the rear half. Such burners would reverse their swinging movements near the central portion of the cascass ~aster than at the reversing points near the end portions of the carcass.
According to another embodimentl one uses a burner which is movable parallel to the longitudinal axis of the body. The burner is moved bac~ and forth with such a ~7arying speed that the flame action time at the head and tail portions of the carcass is longer than the action time at the central portion of the carcass.
The nature of the movement of the burner will cause it to act more intensively at the end portions of the animal in comparison to the central portion. However, one may also increase the flame strength near the reversing points of the movement.
According to a further embodiment of the invention, a plurality o~ stationary burners are used and separate burners or groups of burners are controlled by a timer or are arranged to function with different intensity.
- For removing the fine hairs on the head portion usually five or six rotations of the carcass are necessary. For the tail portion, four to five rotations are necessary and for the central portion three or four. Variation in operating time or flame ~ntensity ~here~Q~e xe~s~ul~s ~n enexg~ ~avings.
~7~17 According to another aspect of the lnvention there is provided an apparatus ~or depilatin~ slaughtered livestock com-prising: a grate or supporting a carcassj a drive shaft arranged underneath said grate and supporting beating and scraping tools such that they extend through said grate between bars of said grate; burner means arranged above said grate; and control means ~or controlling said burner means so as to act on various zones of the carcass with differences in operating time and/or intensity.
The apparatus may comprise one burner which is pivotable about a horizontal axis transverse to the axis of the drive shaft.
The burner pivots about a fixed point and is controlled by control mechanisms, which are known, so that the flame action has the desired effect on the different portions of the carcass.
Alternatively, one could use two separate pivotable burners which operate on the fr~nt and rear halves of the body respectively.
According to a another embodiment a guide rail supporting a burner is installed above the grate. The burner is movable back and forth along a path parallel to the axis of the drive shaft and is controlled so that it operates longex on the head and tail portions than on the central portion. Because of the nature of the movement, the burner will operate longer at the reversing positions than in the centra~ section. If necessary, one could also vary the speed of the burner. Furthermore, one could increase the intensity of the flame at the end portions of the carcass, for lnstance( b~ us~n~ an o~exatin~ lever of a gas valve cooperating 3~p~7~Lfait~9 with a tenslon element W~ich would bring the lever back into the initial position by means of spxing pressure.
~ ccording to a further embodiment, one may use stationary burners functioning with varying pressures and/or varying openings or Lunctioning during varying operating times determined by a timer. It is for instance possible to first start the burners operatin~ on the head section and approximately one rotation later open the gas supply to the bllrners operating on the rear section and again one rotation later starting the burners operating on the central section. All burners can be closed simultaneously.
The inven-tion will be explained in more detail with reerence to the drawings.
Figure 1 illustrates schematically a front view of a first embodiment of a system according to the invention.
Figure 2 illustrates schematically a side view of the system according to Figure 1.
Figure 3 shows also schematically a front view of another embodiment.
Figure ~ shows schematically a side view o~ the embodiment o~ Figure 3.
Figure 5 shows schematically a front view of another embodiment.
Figures 6 and 7 show front views of embodiments with stationary burners.
The system shown in Figures 1 and 2 comprises a frame 1 supporting a sha$t 2 ha,Ying flexible beating and scraping means 3.
3L~74~7 Frame 1 carries a grate 5 consistin~ of bars, the central part of which is bent downwards at 4 to ~orm a pit for receiving khe carcass of a pig.
The beating and scraping means are in the form of rods and are able to move between the bars of the grates during their rotation in the direction of arrow 7. ~ second grate 9 with curved bars extends from the grate 5 upwards such that the carcass is supported by the bars of grate 5 and the bars of grate 9 and is rotated by the beating and scraping means. This is a known technique which is discussed for instance in German Patent 20~37 323. A further grate 8 is adapted to guide the carcass into the system. In the upper part of the frame, a rail track 12 carries a movable burner 11 having a flame mouthpiece 10. The burner is moved back and forth by means o~ an electric motor 13 which may, for instance, drive the burner 11 by means of a chain or a threaded spindle. The flame 14 is directed downwards. If the burner 10, 11 is driven with constant speed, the deceleration and acceleration during the reversing of direction at the ends of the rail track 12 will result in a prolonged flame effect at th~se~positions.
Figure 1 shows a burner near both end positions.
In the embodiments of Figures 3 and 4, two burners 15 and 16 are rotatably carried on transversal axes 18 and 19. Flames 20 acting on the area covered by burners 15, 16, as shown in Figure 3 can be controlled such that they act in the illustrated end position fo~ a lon~er pe~iod than in the non-illustrated other ~'7' end position. ~ns~ead of opposed swinging movements/ the burners may moYe synchronously so that the ~lames remain parallel in all circumstances. ~n that case one avoids overlapping of the flames of both burners in the central area.
Figure 5 shows an embodiment having only one burner 21, which may swing around a centrally positioned shaft 23. The shaft can be driven such that the flames 25 act longer at the reversing points of the swinging movement (at which point the flames are at the greatest distance from the carcass) than in the central area and pass the central area at increased speed. Such a ~ovement may be controlled using known ~means, for instance cam elements or eccentric elements.
In the embodiment o~ Figure 6, a series of stationary burners are divided into a first group 26, a second group 27 and a third group 28. All the burners are connected to a gas pipe 29 having a main stop cock 30, a stop cock 31 on branch 32 shunting the central group of burners 28 and a stop cock 33. All the stop cocks can be controlled by time control mechanisms, which are themselves known/ such that first of all the stop cock 30 will be opened activating the burners 26, whereafter the stop cock 31 will be opened activating the burners 27 and thereafter the stop cock 33 will be opened for the burners 28, whereafter all the stop cocks will be closed simultaneously.
Of course it is also possible to close the stop cocks at di~ferent times.
F~u~e 7 s.ho~w~s a yariant o~ the embodiment oE Figure 6, ~, . ",~
~L~ 74gL~
which variant comprises three grou~s of bu~ners, 34, 35, 36 all connected to the same gas pipe 37 With stop cock 3g. The burners 35 have the smallest mouthpiece diameter, the burners of the group 36 have a somewhat larger mouthpiece diameter and the burners of the group 34 have the largest mouthpiece diameter~ The 1ame strength is therefore adapted to the local circumstances.
In general, when one is depilating slaughtered livestock, especially pigs, in a production line the dimensions of the animals do not vary significantly. Skin and hair characteristics are also in general comparable.
Some production lines treat and depilate 500 to 1000 pigs per hour. With such large production numbers and the very short period of time that each carcass spends in the depilating machine, the continuous maintenance of fixed parameters for the process in which the fine hairs are removed by means of flames is of extremely great significance. This is for the first time completely possible with the method and system according to the invention thereby avoiding a local decrease in the quality of the meat.
~::
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for depilating slaughtered livestock comprising:
subjecting the carcass to a warm water treatment;
roughly depilating the carcass by means of beating and scraping tools while simultaneously rotating the carcass about its horizontal longitudinal axis; and removing the remaining fine hairs using burner means operative over the entire carcass while rotation of the carcass is continued, said burner means acting on various zones of the carcass with differences in operating time and/or intensity.
subjecting the carcass to a warm water treatment;
roughly depilating the carcass by means of beating and scraping tools while simultaneously rotating the carcass about its horizontal longitudinal axis; and removing the remaining fine hairs using burner means operative over the entire carcass while rotation of the carcass is continued, said burner means acting on various zones of the carcass with differences in operating time and/or intensity.
2. A method according to claim 1, wherein said burner means comprises at least one burner which is pivotable about a fixed shaft and is controllable so that it operates longer on the head and tail portions of the carcass than on the central portion of the carcass.
3. A method according to claim 2 wherein said burner means comprises two separate pivotable burners which operate on the front and rear halves of the carcass respectively.
4. A method according to claim 1 wherein said burner means comprises at least one burner which is movable back and forth along a path parallel to the longitudinal axis of the carcass at a varying speed such that it operates longer on the head and tail portions of the carcass than on the central portion of the carcass.
5. A method according to claim 4 wherein said burner operates longer on said head portion than on said tail portion.
6. A method according to claim 1 wherein said burner means comprises at least one burner which is movable back and forth along a path parallel to the longitudinal axis of the carcass and is controllable so that the strength of its flame is greater at the head and tail portions of the carcass than at the central portion of the carcass.
7. A method according to claim 6 wherein said flame has a greater strength at said head portion than at said tail portion.
8. A method according to claim 1 wherein said burner means comprises a plurality of stationary burners which are controllable such that burners acting on one carcass portion operate longer than burners acting on another carcass portion.
9. A method according to claim 8 wherein burners acting on the head portion of the carcass operate longer than the burners acting on the central and tail portions of the carcass.
10. Apparatus for depilating slaughtered livestock comprising:
a grate for supporting a carcass;
a drive shaft arranged underneath said grate and supporting beating and scraping tools such that they extend through said grate between bars of said grate;
burner means arranged above said grate; and control means for controlling said burner means so as to act on various zones of the carcass with differences in operating time and/or intensity.
a grate for supporting a carcass;
a drive shaft arranged underneath said grate and supporting beating and scraping tools such that they extend through said grate between bars of said grate;
burner means arranged above said grate; and control means for controlling said burner means so as to act on various zones of the carcass with differences in operating time and/or intensity.
11. Apparatus according to claim 10 wherein said burner means comprises at least one burner which is pivotable about a horizontal axis transverse to the axis of said drive shaft, said burner means controllable by said control means so that it operates longer on the head and tail portions of the carcass than on the central portion of the carcass.
12. Apparatus according to claim 11 wherein said burner means comprises two separate pivotable burners which operate on the front and rear halves of the carcass respectively.
13. Apparatus according to claim 10 wherein said burner means comprises at least one burner;
a guide rail is arranged above said grate; and said burner is supported by said guide rail, is movable back and forth along a path parallel to the axis of said drive shaft and is controllable by said control means so that it operates longer on the head and tail portions of the carcass than on the central portion of the carcass.
a guide rail is arranged above said grate; and said burner is supported by said guide rail, is movable back and forth along a path parallel to the axis of said drive shaft and is controllable by said control means so that it operates longer on the head and tail portions of the carcass than on the central portion of the carcass.
14. Apparatus according to claim 10 wherein said burner comprises at least one burner;
a guide rail is arranged above said grate; and said burner is supported by said guide rail and is movable back and forth along a path parallel to the axis of said drive shaft, said burner being controllable by said control means so that the strength of its flame is greater at the head and tail portions of the carcass than at the central portion of the carcass.
a guide rail is arranged above said grate; and said burner is supported by said guide rail and is movable back and forth along a path parallel to the axis of said drive shaft, said burner being controllable by said control means so that the strength of its flame is greater at the head and tail portions of the carcass than at the central portion of the carcass.
15. Apparatus according to claim 10 wherein said burner means comprises a plurality of stationary burners, said burners being arranged above said grate and being controllable by said control means such that burners acting on one carcass portion operate longer than burners acting on another carcass portion.
16. Apparatus according to claim 10 wherein said burner means comprises a plurality of stationary burners, said burners being arranged above said grate and being controllable by said control means so that burners acting on the head portion of the carcass operate longer than the burners acting on the control and tail portions of the carcass, all said burners functioning during the same operating time but with varying flame intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000380213A CA1174407A (en) | 1981-06-19 | 1981-06-19 | Method and apparatus for depilating slaughtered livestock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000380213A CA1174407A (en) | 1981-06-19 | 1981-06-19 | Method and apparatus for depilating slaughtered livestock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174407A true CA1174407A (en) | 1984-09-18 |
Family
ID=4120274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000380213A Expired CA1174407A (en) | 1981-06-19 | 1981-06-19 | Method and apparatus for depilating slaughtered livestock |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1174407A (en) |
-
1981
- 1981-06-19 CA CA000380213A patent/CA1174407A/en not_active Expired
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