The present invention relates to a method and system for extruding a consumable end fruit product from a viscous intermediate fruit product, wherein the consumable end fruit product contains a high proportion of fruit.
Increasingly, consumers are concerned about eating healthily. Generally, consumers associate eating healthily with consuming fruit snacks that contain a high proportion of fruit. Such fruit snacks are often perceived as being healthier than fruit snacks that contain additives such as processed or refined sugars, starches, gelatins, gums and preservatives. An example of a fruit snack containing a high proportion of fruit is Sun-Rype™ Products Ltd.'s (“Sun Rype's”) Squiggles™ fruit snack.
In order to produce a consumable end product containing a high proportion of fruit (i.e., the fruit snack), raw materials forming a precursor fruit product can first be transformed into an intermediate product having appropriate properties for forming into the end product. In particular, it is helpful if the intermediate product has certain physical properties, such as sufficient viscosity, that make it suitable for extrusion into the end product. There are a number of challenges in forming the end product from the intermediate product, some of which include:
These problems are alleviated when the precursor fruit product is not composed of a high proportion of fruit, as the additives typically found in such precursor fruit products, such as gelatins, starches, and refined sugars, can be used to create an intermediate product with a high Brix content at lower cooking temperatures, and which are not as sticky or viscous as an intermediate product containing a high proportion of fruit.
Consequently, there is a need for a method and system for forming a consumable end fruit product having a high proportion of fruit from a viscous intermediate fruit product.
Accordingly, it is an object of the invention to provide at least one of a method or system for forming a consumable end fruit product.
According to a first aspect of the invention, there is provided a method for producing a consumable end fruit product composed of a high proportion of fruit from an intermediate fruit product. By “high proportion of fruit”, it is meant that the consumable end fruit product can have between about 50% to about 100% fruit material; alternatively about 60% to about 100% fruit material; alternatively about 70% to about 100% fruit material; alternatively about 80% to about 100% fruit material; alternatively about 90% to about 100% fruit material; or alternatively about 100% fruit material. In this application, “fruit” or “fruit material” includes any material derivable from fruit, including isolated pectin, but excludes non-fruit materials such as refined sugars, starches, and oils.
The method includes the steps of extruding the intermediate fruit product to form an extruded fruit product; and cooling the extruded fruit product to form the consumable end fruit product. The step of extruding the intermediate fruit product can be performed at a temperature of at least about 90° C. The step of cooling the extruded fruit product can include cooling the extruded fruit product to about 20° C. The intermediate fruit product can include a fruit product having a sugar content of about 84 to about 88° Brix.
The step of extruding the intermediate fruit product to form the extruded fruit product can include the additional steps of extruding the intermediate fruit product on to a conveyor belt at an extrusion rate, the extruded fruit product contacting the conveyor belt; and conveying the extruded fruit product away on the conveyor belt at a belt rate. The ratio of the extrusion rate over the belt rate can be about 3.7 kg/m, where the extrusion rate is about 10 kg/min and the belt rate is about 2.7 m/min. The ratio of the extrusion rate over the belt rate can be at least about 4.0 kg/m, whereby increasing the ratio results in the extruded fruit product taking on an undulating shape. The extruded fruit product can take on an undulating shape when the extrusion rate is about 8.3 kg/min and the belt rate is about 2.1 m/min, for example.
The step of cooling the extruded fruit product to form the consumable end fruit product can include the steps of cooling the extruded fruit product a first time; drying the extruded fruit product; and then cooling the extruded fruit product a second time. The step of cooling the extruded fruit product a first time can include cooling the extruded fruit product to about 30° C. The step of drying the extruded fruit product can include heating the extruded fruit product within a drying tunnel that is at a temperature of about 95° C. for about 20 minutes. The step of cooling the extruded fruit product a second time can include cooling the extruded fruit product to about 18° C.
The method for producing a consumable end fruit product can also include the step of cutting the consumable end fruit product with a guillotine. The guillotine can cut the consumable end fruit product to any suitable length.
According to a further aspect of the invention, there is provided a system for producing a consumable end fruit product composed of a high proportion of fruit from an intermediate fruit product. The system includes an extruder, the extruder extruding the intermediate fruit product into an extruded fruit product; a conveyor, the conveyor receiving the extruded fruit product; and a cooling portion, the conveyor transporting the extruded fruit product into the cooling portion, the cooling portion outputting the consumable end fruit product. The consumable end fruit product can be composed of about 100% fruit. The cooling portion can include a first cooling unit.
In addition to having a first cooling portion, the system may also include a drying portion and a second cooling portion, the extruded fruit product being conveyed from the first cooling portion to the drying portion and then to the second cooling portion, the second cooling portion outputting the consumable end fruit product. The drying portion may include a drying tunnel and the second cooling portion may include a second cooling unit.
The extruder can include a manifold; a pump fluidly coupled to the manifold; and a nozzle fluidly coupled to the pump, the nozzle extruding the intermediate fruit product into the extruded fruit product. Steam may be circulated around or through any one or more of the manifold, pump, and nozzle. The nozzle can be positioned substantially parallel to and behind a topmost surface of the conveyor belt, or can be positioned above the conveyor belt. When positioned above the conveyor belt, the nozzle can be positioned at an angle of about 60 degrees relative to the conveyor belt, and a semi-cylindrical bump can be positioned underneath the nozzle for receiving the extruded fruit product. The nozzle can further include a mask for defining a cross section of the extruded fruit product. The mask can have a pattern selected from the group consisting of a rocket ship, a crescent moon, a star, a space ship, a planet, a whale, a sea horse, an octopus, a turtle, or a sea shell, and can also have a pattern such that the extruded fruit product is in the form of a rectangular strip. If a star-shaped mask is used, the mask can further have a crenated star-shaped cross-section.
The system may also include a guillotine, the guillotine receiving the consumable end fruit product and used for cutting the consumable end fruit product.
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
a) is a side elevation view of a series of extrusion nozzles coupled to a nozzle bar that can be used to extrude intermediate fruit product on to a processing line according to an alternative embodiment, wherein the conveyor belt used in the processing line has a “speed bump” on to which fruit product can be extruded.
a) is a front elevation view of a portion of a manifold coupled to pumps and the nozzle bar.
b) is a side elevation view of one of the extrusion nozzles as depicted in
c) is an end view of one of the pumps used in
d) is a schematic, side sectional view of the pump depicted in
e) is a schematic, front sectional view of the manifold depicted in
a)-6(n) are cross-sections of patterns that can be placed on an end of an extrusion nozzle as depicted in
Referring generally to
Any method known in the art can be used to create a suitable intermediate fruit product. For example, the “fruit mass” that can be produced according to the method and apparatus described in published United States patent application 2009/0169694 can act as the intermediate fruit product. The intermediate fruit product is channeled into a manifold 14 (as depicted in
The extruded fruit product is conveyed to a cooling tunnel 22. The cooling tunnel 22 can use both convection cooling (between the extruded fruit product and the circulating air) and contact cooling (between the conveyor belt 20 and an underlying cooling plate) to reduce the temperature of the extruded fruit product to approximately 16-18° C. In this exemplary embodiment, with respect to convection cooling, air temperature of the cooling tunnel 22 can be set to 8° C., while the temperature of the cooling plate can be set to 8° C. The residence time of the extruded fruit product in the cooling tunnel is approximately 8 minutes. Operating in conjunction with the cooling tunnel 22 is an air dehumidifier 24 and a chiller 30. The dehumidifier 24 dehumidifies air in the cooling tunnel 22 and consequently helps to cool the extruded fruit product. The chiller 30 is used to cool the air circulating within the cooling tunnel 22 and to cool the cooling plate responsible for contact cooling.
Following cooling, consumable end fruit product results. The end fruit product can then be conveyed to a guillotine 26 for cutting. Following the guillotine 26, the consumable end fruit product is ready for packaging and consumption.
Referring now to
In order to prevent the intermediate fruit product from cooling to a temperature that renders the intermediate fruit product too viscous to extrude, the manifold 14, pumps 16, and nozzle bar 11 all should be kept above a certain temperature. In this exemplary embodiment, the temperature of the intermediate fruit product should be kept above 90° C. prior to and during extrusion. This can be done by circulating steam through pipes surrounding or embedded within the manifold 14, pumps 16, and nozzle bar 11, for example.
For instance,
e), which is a sectional view of the nozzle bar 11, illustrates how a nozzle steam conduit 25 can extend through the body of the nozzle bar 11 in order to maintain the temperature of the intermediate viscous fruit product at a level that is suitable for extrusion. In
Steam can be circulated through the manifold 14, pumps 16, and nozzle bar 11 in series such that only the temperature of the last pump 16 in series and nozzle bar 11 need be monitored in order to ensure that the temperature of all pumps 16 and nozzle bar 11 are above 90° C.
The nozzles 18 can be positioned relative to the conveyor 20 in several ways. In the exemplary embodiment depicted in
The rates at which the intermediate fruit product is extruded (the “extrusion rate”) and the rate at which the conveyor belt 20 moves (the “belt rate”) will depend on the nature of end fruit product desired. At certain relative extrusion and belt rates, the extruded fruit product will be substantially linear. In an exemplary embodiment wherein a total of 28 extrusion nozzles 18 are used, a cumulative extrusion rate of 640 kg/hr and a belt rate of 2.7 m/min result in a substantially linear rope or strip of extruded fruit product. Subsequently increasing the extrusion rate while keeping the belt rate the same will result in an undulating extruded fruit product. Similarly, subsequently decreasing the belt rate while keeping the extrusion rate the same will also result in an undulating extruded fruit product. An exemplary undulating extruded fruit product is depicted in
Referring now to
While the above text describes the operation of one embodiment of the processing line 10 in steady-state, prior to entering steady-state operation certain start-up steps that transition the processing line 10 from a non-operational state to steady-state should be followed. These steps include:
In an alternative embodiment of the processing line 10 as depicted in
The start-up steps for this alternative embodiment and the first embodiment are substantially similar.
While a particular embodiment of the present invention has been described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention and are intended to be included herein. It will be clear to any person skilled in the art that modifications of and adjustments to this invention, not shown, are possible without departing from the spirit of the invention as demonstrated through the exemplary embodiment.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CA09/01016 | 7/17/2009 | WO | 00 | 8/30/2011 |
Number | Date | Country | |
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61081992 | Jul 2008 | US |