Consumers increasingly rely upon the convenience of packaged food products. Convenience foods for both animals and humans have proliferated—and range from healthy to indulgent. Consumables such as, but not limited to, cookies, candies, crackers, and animal nourishment, come in a variety of textures, compositions, shapes, and sizes. Rotary die cutters and rotary die molds are a popular method of forming consumable food products.
A rotary die ejection technology is disclosed. A rotary cylinder includes die cavities and/or die cutters arranged on its surface and assembled with ejection orifices. The ejection orifices are in fluid communication with the internal chamber of the rotary cylinder. The ejection orifice is associated with a porous material.
A shaft having a channel may extend axially through the internal chamber. The shaft may have a channel seated therein. The channel may be in fluid communication with outlets extending generally radially outward form the channel to locations on the outer surface of the shaft. The outlets may eject air directly into the space of the internal chamber. Alternatively or additionally, the shaft may be assembled with a manifold. The manifold may be positioned below the shaft and may include conduits. The conduits may be positioned for intermittent alignment with the orifices in the rotary cylinder as the rotary cylinder rotates relative to the manifold.
Other features and advantages of the disclosure will be, or will become, apparent to one of skill in the art upon examination of the following figures and detailed description. It is intended that all such additional advantages and features be included in the description, be within the scope of the invention, and be protected by the claims.
Food products of various kinds, including cookies, crackers, candies, animal consumables, and other products, are frequently formed by high-volume automated rotary mold and/or rotary cutting devices. A rotary die molder is a cylinder, the surface of which is covered with shallow engraved cavities. A rotary cutter is a cylinder, the surface of which is covered with portions that rise about the face of the cylinder. Hybrid forms may also exist which include both engraved cavities and raised portions. In one exemplary process, the cylinder rotates past the opening in a hopper filled with food product (e.g., a food dough). The food product fills any engraved portions on the cylinder. Excess dough is sheared off from the main mass by a blade. As the cylinder continues to rotate, the dough pieces are released and/or ejected, e.g., onto a conveyor belt. In some variations, there are two counter rotating rolls, e.g., a molding roll and a feed roll. The dough may fill the pinch point created by the two rolls and may be thereby forced into a mold cavity.
In another exemplary process, rotary die cutting uses a cylindrical die on a rotary press. A long sheet or web of material is fed through the rotary press into an area which holds a rotary tool, for example but not limited to, a rotary die cutter or a rotary die mold. The rotary tool may cut out shapes, make perforations or creases, impart aesthetic design, and/or cut the sheet or web into smaller parts. In a variation, rotary die cutting allows for the manufacture of multiple substantially identical formed products. In a variation, a molder may have several different shapes per roll, for example, cookies in the shape of various animals.
Several processes are used to release the formed product from the rotary tool. Some use fat and lard as lubricants to discourage attachment of the food product to the rotary tool. For example, some manufacturers increase the fats and/or oils used in dough recipes to achieve a dough that will have reduced affinity for the rotary tool. However, the addition of fat to foods has become less desirable to consumers who are weight and/or health conscious. With the rising popularity of fat-free products, the industry increasingly adopted rotary tool coatings to assist release of formed shapes. Examples of rotary tool coatings include formulations of TEFLON and ceramics that are FDA and USDA approved for food contact.
Many known coatings wear out from repeated use; therefore the rotary tools require routine maintenance. As the rotary tool coatings wear out, the release fidelity decreases. Product increasingly sticks to the surface of the rotary tool. Decreases in fidelity result in considerable expense due to lost food product (e.g., through deformations, and sticking), down time, and loss of efficiency. Furthermore, the maintenance process results in downtime. Maintenance requires removing the subject machine from operation while the rotary tool is removed for reconditioning. The reconditioning process takes several days to several weeks and bears a significant expense. In an attempt to realize a large product output despite the maintenance inefficiencies, many companies are required to run several machine lines so that they can rotate production and maintenance. This requires larger more expensive facilities to house redundant machinery.
We disclose a rotary tool ejection technology that is capable of operating at high efficiency with minimal maintenance. In one variation, the rotary tool ejection technology eliminates the requirement of rotary tool coatings. In a variation, the rotary tool ejection technology eliminates the requirement of the use of lubricants, including by increasing the fat content of the food product. In a variation, the rotary tool ejection technology features a rotary tool with no internal moving parts, further reducing maintenance concerns. The reduction of moving parts further increases the sanitation of the system, as moving parts often create additional surfaces in which food product may be trapped.
We also disclose a novel method of employing a porous material within the rotary tool system. In one variation, the porous material may be a porous metal material that has inter-connected porosity. A porous metal material may be fabricated from metal powder particles using powder metallurgy techniques. The porous material may have a range of pore sizes from about 0.5 micrometer to about 200 micrometers.
Definitions
Definitions: unless stated to the contrary, for the purpose of the present disclosure the following terms shall have the following definitions:
A reference to “another variation” in describing an example does not imply that the referenced variation is mutually exclusive with another variation unless expressly specified.
The terms “a,” “an” and “the” mean “one or more,” unless expressly specified otherwise.
The phrase “at least one of” when modifying a plurality of things (such as an enumerate list of things) means any combination of one or more of those things, unless expressly specified otherwise.
The term “represent” and like terms are not exclusive, unless expressly specified otherwise. For example, the term “represents” does not mean “represents only,” unless expressly specified.
The term “e.g.” and like terms means “for example, but not limited to” and thus does not limit the term or phrase it explains.
The term “porous material” refers to a material that has inter-connected porosity and/or a material that is microdrilled. A porous material may be fabricated from metal powder particles using powder metallurgy techniques. The porous material may comprise synthetic materials, ceramics, or combinations and composites thereof. The porous material may be a sintered material or may be a micro-drilled material. The porous material may have a range of pore sizes (whether created by a sintering process or by micro-drilling) from about 0.1 micrometer to about 300 micrometers. For example, the porous material may have a pore size in the range in micrometers of about 0.1-300, 0.2-100, 5.0-50, 20-50, or any individual value or range falling in between the listed ranges. Additionally or alternatively, the pore size within a porous material may vary throughout the material or the porous material may include pores of more than one pore size within the disclosed ranges.
Referring to
The shaft 122 has a channel 124 seated therein.
Turning to
The channel 124 is in fluid communication with the plurality of outlets 126 which exit on the surface of the shaft 122. The outlets 126 may extend generally radially outward from the channel 124, (which may be a longitudinal channel) to locations on the outer surface of the shaft 122. Air flowing through the channel 124 may be directed out of the shaft 122 and into the internal chamber 120, which may represent the internal volume of the rotary cylinder 110. The shaft 122, an end hub 312 and the rotary cylinder 110 may be in a sealed arrangement, creating a sealed internal chamber 120. The sealed arrangement may permit air flow only through the orifices 114.
The example of
Air 410 supplied through the channel 124 and exiting through outlets 126 into the internal chamber 120 may expand. The internal volume of air in the internal chamber 120 may remain at a pressure greater than ambient pressure.
There are multiple manners of integrating the porous material 510 into the orifice 114. These have been illustrated in commonly owned patent application Ser. Nos. 14/810,612; 14/810,833; and 14/850,839, each of which are incorporated herein in their entirety. In this example, the porous material 510 is provided in a disk formation. The porous material 510 is assembled with an insert housing 512. The insert housing 512 provides a carrier for the porous material 510.
The porous material 510 may have the advantage of preventing the content, e.g., a dough product from being caught or trapped in the orifice 114. In a variation that uses an insert housing 512 inserted into the orifice 114, the porous material 510 may prevent the content from being caught or trapped in the insert housing 512. The porous material 510 may permit air to flow from the internal chamber 120 through the porous material 510 assembled into the orifice 114, providing an ejection force on any dough material present in the die 112 (which may be a mold and/or cutter). Alternatively or additionally, the porous material 510 may permit air to flow from the internal chamber 120 through the porous material 510 assembled into the orifice 114, preventing or reducing dough sticking to the die 112 (which may be a mold and/or cutter). The porous material 510 may have the additional or alternative property of prohibiting the flow of content (e.g., dough, cookie dough, cracker dough, candy paste, and other food material) back into the porous material 510, the insert housing 512, internal chamber 120 and/or orifice 114. The porous material 510 may additionally or alternatively vent the die 112, which may improve product fidelity by relieving entrapped air from the cavity. Entrapped air may prevent good packing. Good packing of dough into the cavity improves product quality and shape.
The die 112 may include one or more docker pins 514. The docker pins 514 may also be of a variety and description described in more detail in commonly owned patent application Ser. Nos. 14/810,612 and 14/810,833, incorporated herein. Docker pins 514 may have functions including but not limited to piercing dough for air release, promoting free release of a cut or molded product, and/or retention of a molded product.
Turning to
The end hub 312 may be assembled with a stub shaft 610. The stub shaft 610 may have a stub shaft channel 612 seated therein. The stub shaft channel 612 is in fluid communication with internal chamber 120. The stub shaft 610 may have a stub shaft inlet 614 adapted for connection to a source of pressurized air. Air flowing through the stub shaft channel 612 may be directed out of the stub shaft 610 and into the internal chamber 120, which may represent the internal volume of the rotary cylinder 110. The stub shaft 610 is just one manner of delivering pressurized air to the internal volume 120 of the rotary cylinder 110.
Turning to
A manifold 700 may be assembled with the shaft 122. The manifold 700 may be suspended from the shaft 122 and supported by bearings 708. The manifold 700 may include an internal bore 712. The internal bore 712 may be adapted to assemble with the shaft, e.g., adapted for assembly around the shaft 122. The region of the manifold below the internal bore 712 may be referred to as the ejection body 710. The ejection body 710 may be a region of the manifold 700 that directs ejection air to a portion of the rotary cylinder 110.
The internal bore 712 of the manifold 700 may be assembled around the shaft 122 such that the internal bore 712 has a concentric relationship to the shaft 122. The ejection body 710 may have a gravitational arrangement with the shaft 122. A gravitational arrangement may be created where the ejection body 710 is suspended vertically below the shaft 122 and maintained in a fixed position, e.g., by gravitational force. The shaft 122 and rotary cylinder 110 may rotate freely while the ejection body 710 remains suspended in its gravitational arrangement below the shaft 122.
The internal bore 712 and thus the manifold 700 may be spaced from the shaft 122 by the bearings 708. Mounting of the bearings 708 from the shaft 122 may create an air passage 714 between the manifold 700 and the shaft 122. The air passage 714 may receive air from the outlets 126 on the shaft 122. The air passage 714 may supply air to conduits 716. The conduits 716 may be positioned for intermittent alignment with each of the orifices 114 in the rotary cylinder 110 as the rotary cylinder 110 rotates relative to the manifold 700. The manifold 700 may be in sealed arrangement with the shaft 122 such that air entering the manifold 700 from the outlets 126 on the shaft 122 does not substantially enter the internal chamber 120 of the rotary cylinder 110.
The manifold 700 may hang freely in the internal chamber 120, and may be dimensioned within the internal chamber 120 such that, when hanging from the shaft 122, a precision gap 810 exists between a bottom-most portion of the manifold 700 and the inner surface 116 of the rotary cylinder 110. In an exemplary variation, the precision gap 810 may be an about 0.001 to about 0.015 inch space between the bottom most portion of the manifold 700 and the inner surface 116 of the rotary cylinder 110. The precision gap 810 may restrict air flow into the internal chamber 120 of the rotary cylinder 110. For example, the precision gap 810 may substantially reduce or eliminate air leakage from the manifold 700 to the inner chamber 120 of the rotary cylinder 110.
Conduit 716 and supplemental conduit 912 may supply conduits at disparate locations on the rotary cylinder 110. Where the conduit 716 and supplemental conduit 912 supply different locations, they may also provide different functions. In an example, rotary cylinders including dies 112 in the cutter formation operate by cutting product from a sheet of dough. The dough that remains after product is removed from the sheet of dough is commonly referred to as webbing. Webbing represents scrap material. The orifices 114 receiving air from conduits 716 and/or supplemental conduits 912 may be arranged relative to the dies 112 (e.g., outside of the dies 112 versus inside of the dies 112 or otherwise) such that air ejection may be used to assist scrap removal from the rotary cylinder 110. A multi-ejection system may permit tailored air flow, e.g., a system that permits air flow to effect ejection of product at one location while ejecting scrap at a second, disparate location.
While variations of the invention have been described, it will be apparent to those of skill in the art that many more implementations are possible that are within the scope of the claims.
This application is a continuation of U.S. patent application Ser. No. 15/262,299, filed Sep. 12, 2016, and issued as U.S. Pat. No. 9,844,889 on Dec. 19, 2017, which claims the benefit of the filing date under 35 U.S.C. § 119(e) of Provisional U.S. Patent Application Ser. No. 62/218,135, filed Sep. 14, 2015. The contents of each of these documents are hereby incorporated by reference in their entirety.
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Number | Date | Country | |
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20180333885 A1 | Nov 2018 | US |
Number | Date | Country | |
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62218135 | Sep 2015 | US |
Number | Date | Country | |
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Parent | 15262299 | Sep 2016 | US |
Child | 15845564 | US |