DE-AERATION CAVITIES IN A MOULD MEMBER

Abstract

The present invention relates to a food product forming apparatus with a food forming member, which comprises a multitude of product cavities and a seal plate which sealingly cooperates with the surface of the mould drum.

Claims

1. Food product forming apparatus comprising: a mould drum comprising a multitude of product cavities, each of the product cavities comprise a bottom wall and a sidewall made totally of a porous material, and a seal member that is a seal plate, which sealingly cooperates with a surface of the mould drum, wherein the seal member comprises a venting means.

2. Food product forming apparatus according to claim 1, wherein the venting means is a valve.

3. Food product forming apparatus according to claim 1, wherein the venting means is a gap between the mould drum and the seal member.

4. Food product forming apparatus according to claim 3, wherein the food forming apparatus comprises a pressure element that is configured to press the seal member against the mould drum, wherein the food forming apparatus comprises a control means that is configured to control the pressure element to influence a size of the gap.

5. Food forming member according to one claim 1, wherein the product cavities are at a circumference of the mould drum.

6. Food forming member according to claim 1, wherein the product cavities are at least partially made from the porous material.

7. Food forming member according to claim 6, wherein the product cavities are vented via the porous material.

8. Method to form a food product in a cavity of a mould drum, wherein, the cavity comprises a bottom wall and a sidewall that are totally made from a porous material, which is sealed by a seal member, wherein the cavity is at least partially vented via the seal member or a gap between the seal member and the mould drum.

9. Method according to claim 8, wherein a pressure between the seal member and the mould drum is released until entrapped air escapes.

10. Method according to claim 8, wherein a valve in the seal member is opened during and/or after filling of the cavity.

Description

[0019] The inventions are now explained according to the Figures. Theses explanations do not limit the scope of protection. The explanations apply to all embodiments of the present invention likewise.

[0020] FIGS. 1 and 2 depict the state in the art.

[0021] FIGS. 3-6 each depict an embodiment of the present invention.

[0022] FIG. 1 depicts a food forming apparatus 1 according FIG. 25 (FIG. 1a) and FIG. 28 (FIG. 1b) of WO2013014010. The mould member is a mould drum 6 rotating in counter-clockwise direction and provided at its circumference with a multitude of cavities 7. As can be seen, there are more than one cavity in one row, i.e. more than one cavity is filled and emptied simultaneously. These cavities comprising a bottom wall and a sidewall and are in this embodiment at least partially made from a porous structure. During filling air entrapped within the cavity and within the food mass will be removed through the porous structure of the cavities to the fluid passage 8 and from thereon to the ambient. Driving force for this is the pressurized mass flowing via mass supply 2 (food pump, not depicted) and food mass infeed channel 3 into the cavity. To prevent distortion of the formed food product a pressurized cutting member 10 is pressing against the seal plate or directly against the mould drum in the downstream area of the manifold.

[0023] Pressure means 12 and 13 are depicted as stabilization elements, more specifically as blocks, preferably plastic blocks, however these stabilization elements can be designed differently, for instance a bended plate as long as the design allows the stabilization elements to follow the deformation of the drum. Pressure elements 16 in row A and B in upstream sealing area 4 will press seal plate 9 via upstream stabilization element 12 and manifold 11 against the circumference of drum 6. Pressure elements 16 in row C and D in downstream sealing area 5 will press seal plate 9 via downstream stabilization element 13 and manifold 11 against the circumference of drum 6. The seal plate 9 is flexible and hence able to follow the irregularity of the surface of the drum and is in the upstream sealing area and the downstream area in sealing connection with the drum, so no air can escape to the ambient.

[0024] The pressure elements 16 are depicted as double-acting actuators more specifically as double-acting pneumatic cylinders whose piston is directly or via connecting elements 15 connected to the stabilization elements 12, 13. All pressure elements in one row can be pressurized individually with an individual pressure or with one and the same pressure. All rows can be pressurized with a unique pressure or with one and the same pressure. The outermost pressure elements L and R will prevent leakage of food mass beyond the outer ends of the drum. The number of pressure elements depends mainly on the length of the drum and/or the forces acting on the drum (pressure food mass, pressure of the pressure elements, weight drum) and/or the deformation of the drum versus the stiffness of the stabilization elements. The pressure elements are able to retract the manifold and stabilization elements to a position in which the food forming apparatus can be serviced, cleaned and for instance the seal plate can be exchanged.

[0025] FIG. 2 depicts de-aeration of the cavity. The filling of the mould cavity will start as soon as, due to rotation of the mould drum, the down stream end of the mould cavity Bmc passes the upstream end of the channel Bfc and will stop as soon as the upstream end of a mould cavity Emc passes the down stream end of the feed channel Efc. Sealing between the seal member 9, here a seal plate, and the mould drum 6, here a mould drum, up stream from the filling slot, takes place between begin sealing area Bsa and begin feed channel Bfc. The sealing length Lsd in circumferential direction drum is here shorter than cavity length Lcd in circumferential direction drum.

[0026] Initially, during the filling of the cavity with pressurized food mass the mass will consequently force the entrapped air within the cavity, which is subjected to a lower pressure, to flow via opening Bsa-Emc to the ambient. During further rotation of the drum the cavity will be further filled with a volume of food mass. The remaining volume of entrapped air in the cavity will be compressed and forced over the decreasing distance Bsa-Emc to the ambient. De-aeration along the sealing will stop as soon as the distance Bsa-Emc is zero. In an embodiment with a cavity with an at least partly porous structure or other de-aeration means such as perforations and/or openings, additional de-aeration can take place via the de-aeration means of the cavity.

[0027] Taken into account the desired operating parameters such as fill pressure and rotational speed of the mould drum, the sealing length Lsd will be chosen such that the de-aeration to the ambient along the adapted sealing is sufficient and without any leakage of food mass to the ambient.

[0028] It has now been found that the design according to the state in the art may lead to only partially filled cavities.

[0029] FIG. 3b depicts a first embodiment of the invention to remove entrapped air from the cavity via the seal member, here a seal plate 9. In the present case, vacuum is in fluid-connection with the cavity, not via the porous structure of the cavity but via recess 17 in sealing 9. The person skilled in the art understand, that it may be sufficient to connect the cavity via the seal plate to a pressure lower than the filling pressure, for example ambient pressure. In case mass properties and/or properties related to the cavity and/or process parameters will vary, vacuum parameters can be adjusted such that each cavity is entirely filled in combination with the correct weight and without leakage of mass via the vacuum connection. Preferably the vacuum parameters such as the level of vacuum and the timing (the instant that vacuum start and stops, duration) in which the vacuum connection is in contact with the cavity, will be determined within the control system, preferably automatically, such that no human action is needed. In case a connection to a vacuum source during production of the food forming apparatus is not required this embodiment can operate without vacuum and still de-aeration along the sealing and through recess 17 will take place as depicted in FIG. 3a. In case no de-aeration at all along the sealing is required recess 17 can be closed-off (not depicted). In case there is more than one cavity in one row, the vacuum applied to each cavity, can preferably controlled individually.

[0030] A second embodiment is depicted in FIG. 4a. Here, a valve 19 is provided to control and/or adjust the vent-gas flow from each cavity or a row of cavities. This valve can be actuated manually but is preferably operated by motorized drive means such that de-aeration of entrapped air within the cavity takes place during sealing of the cavities, through recess 17 and, for example via housing 18, to the ambient. FIG. 4b depicts the valve in a closed position such that no de-aeration from the cavity to the ambient can take place. There can be one valve per cavity in one row. However, there can be also less valves than cavities in one row. In the second case, there is preferably a manifold provided in the seal plate, which collects the vented gas and leads it to the valve and then for example to the ambient.

[0031] FIG. 5 depicts a third embodiment of the invention in which valve 19 will be displaced, here in valve housing 18, in radial direction with respect to the axis of rotation of the drum. The valve can be moved manually but preferably via drive means. FIG. 5b depicts the valve in a closed position.

[0032] FIG. 6 shows yet another embodiment of the present invention. In this case, the entire venting or the venting additionally to a venting via the cavity takes place by means of a gap 20 between the form- and the seal member 9.

[0033] The size of the gap can, for example be controlled by the pressure means explained according to FIG. 1. In case no de-aeration of entrapped air via the gap 20 is needed, the seal plate in the upstream sealing area can be pressed over its entire length against the outer surface of the drum as depicted in FIG. 1. In cases, de-aeration along the seal plate is required, the relevant pressure elements in row A can be actuated such that before and/or during and/or after filling entrapped air within the cavity can escape via a shortcut from the specific cavity along the sealing and to the ambient. Therefore, the pressure elements will retract the pressure means and sealing away from the position of the drum resulting in deformation of the seal plate as depicted in FIG. 6 and/or their pressure is reduced such that the pressure of the air to entrap opens the gap.

[0034] Based on the same forming apparatus, process parameters and same position of a cavity relative to the feed channel; in FIG. 6a the sealing is subjected to a high degree of deformation resulting in a substantial filled cavity contrary with FIG. 6b in which the seal plate is deformed only slightly.

[0035] The pressure elements 16 used in row A D and specifically used in row A can be configured as a mechanism driven by a motor. In another embodiment, the pressure elements are separate inflatable bellows or cylinders in order to press the pressure means and sealing against the circumference of the drum and further separate pressure elements to retract the pressure means and sealing away from the drum. Preferably the pressure elements are double-acting actuators more specifically double-acting pneumatic cylinders which pistons are directly connected to pressure means such as the stabilization element 12 or indirectly via connecting elements 15. Pressure means 12 will preferably be connected to the seal plate.

[0036] In order to achieve a stable system and/or stable process, the drive mechanisms to drive the valve in the embodiment according to FIGS. 4 and 5 and/or to vary the degree of deformation of the seal plate in the embodiment according to FIG. 6 are preferably automatically controlled by a control unit which is part of the forming apparatus such that no manual intervention is needed during production, even if the mass properties and/or properties related to a cavity and/or process parameters will vary during production. The valve and/or the size of the gap may be pressure controlled and/or controlled depending on the rotational position of the drum, for example the position of a cavity relative to the filling slot and/or the seal member.

[0037] In case de-aeration via a cavity will be combined with additional de-aeration means such as described in inventive embodiments, the pressure on the food mass can be reduced. Less force on the food mass will result in less damage of the composition/structure of the mass during transportation from the mass supply system to the cavity. Further it will prevent clogging of the porous structure and/or openings in the cavity.

[0038] For all described embodiments, de-aeration along and/or through the sealing can already start before the downstream end of the mould cavity Bmc passes upstream end of the feed channel Bfc, thus before filling of the cavity actually starts.

[0039] Beside the described embodiments, a combination of embodiments such as a cavity with a porous structure connected to the ambient, vacuum connected to a cavity via the sealing, sealing provided with a valve, retractable sealing, etcetera can be used. Embodiments of inventions described in combination with a mould drum may also be used in combination with a mould plate.

LIST OF REFERENCE SIGNS

[0040] 1 food product forming apparatus

[0041] 2 mass supply

[0042] 3 food mass infeed channel

[0043] 4 upstream sealing area

[0044] 5 downstream sealing area

[0045] 6 food forming member, drum, mould drum

[0046] 7 product cavity

[0047] 8 fluid passage

[0048] 9 seal member, seal plate

[0049] 10 cutting member

[0050] 11 manifold

[0051] 12 upstream stabilization element

[0052] 13 downstream stabilization element

[0053] 14 frame

[0054] 15 connecting element, piston

[0055] 16 pressure element, actuator, cylinder

[0056] 17 Recess

[0057] 18 Valve housing

[0058] 19 Valve

[0059] 20 gap between seal plate 9 and mould drum 6

[0060] A-D row numbers

[0061] L-R individual pressure elements left-right

[0062] Bsa begin sealing area

[0063] Esa end sealing area

[0064] Bfc begin feed channel

[0065] Efc end feed channel

[0066] Bmc begin mould cavity seen in rotational direction drum

[0067] Emc end mould cavity seen in rotational direction drum

[0068] Lcd cavity length in circumferential direction mould drum

[0069] Lsd sealing length in upstream sealing area mould drum