The present disclosure relates to a panel structure, and more particularly to a panel structure having a low-density core and a high-density sheet material folded therearound.
Various materials are used for constructing boxes, shelves, pallets, and other such objects that are used to hold and/or support a weight of various items. Materials such as paper, wood, metal and plastic can be used in the design and manufacture of such items. The use of paper materials can be cost competitive to materials such as wood, metal, and plastic, while at the same time offering benefits that are not available through the use of traditional wood materials. The benefits of using paper materials are several fold. Paper products can be made lighter than wood, plastic, or metal products, and when formed into a honeycomb structure may have remarkable strength.
Further, paper products can be made biodegradable to allow for disposal without penalty charges or prohibitions from land fills or they can be baled and recycled to paper companies. Because of the ease of working with paper materials and the availability of various honeycomb structures, products can be manufactured in a variety of shapes and sizes to meet any particular requirements.
Panels known in the prior art often employed mechanical folding or pressing methods to form sheet material around the edges panel core. These methods resulted in imprecisely formed edges, which may be rounded, not sharp, with relatively large radii.
U.S. Pat. No. 5,269,219 shows panels that are covered with corrugated material which was scored prior to folding. Scoring is beneficial prior to folding corrugated material, such as cardboard, because the fold is not straight otherwise. Corrugated material, however, is thicker and less dense than solid sheet material, and thus does not have the same beneficial strength versus size characteristics as does solid sheet material.
One embodiment of a panel structure may include a low-density core configured for withstanding loads normal to a first primary surface. A first facing of high-density sheet material extending along the first primary surface may be laminated on the core such that the laminated core and facing cooperatively resist bending loads and loads along the primary surface, the first facing extending from the first primary surface on a side of the core along a secondary surface, which is non-parallel to the first primary surface. The first facing may include a bend along a score line between the first primary surface and the secondary surface.
The first facing may extend from the first primary surface around the secondary surface to a second primary surface on an opposite side of the core from the first primary surface. The first facing may include another bend along another score line between the secondary surface and the second primary surface. A second facing of high-density sheet material may extend along the second primary surface, wherein the first facing is affixed to an outer surface of the second facing on the secondary surface. The score line is provided in the first facing using a substantially circular blade having a 16-inch diameter.
The first facing may be made of a paper material. The paper material may be a multilayered sheet material. The paper material may have a density between approximately 26 lb./1000 sq. ft.-90 lb./sq. ft. The core may be a honeycomb material. The honeycomb core may be made of a material having more than 70% airspace, and the first facing comprises a material having less than 10% airspace. The first facing may have a significantly greater density than the low-density-core.
The panel structure may include one or more runners provided along a bottom surface of the panel structure that is opposite to the first primary surface. The panel structure may be provided as a wall of a shelf. The panel structure may be provided as a wall of a receptacle.
The bend and score line may be configured for maximizing a flat, printable area along the first primary surface of the receptacle. A printable area on the secondary surface may be provided.
One embodiment of a method of forming a pallet structure may include providing a low-density core configured for withstanding loads normal to a first primary surface, providing a first facing of high-density sheet material that includes first and second portions, the first facing having a score line between the first and second portions, laminating the first portion of the first facing onto the core along the first primary surface in an association to cooperatively resist bending loads and loads along the primary surface, and bending the second portion of the first facing with respect to the first portion of the facing along the score line to produce a crisp bend such that the second portion of the first facing extends on a side of the core along a secondary surface, which is non-parallel to the first primary surface.
The scoring may be conducted after the lamination of the first facing onto the core. The score line is provided using a substantially circular blade having a 16-inch diameter.
The method may further include providing a second score line between the second portion and a third portion of the high-density sheet material and bending the third portion of the first facing with respect to the second portion of the facing along the second score line to produce a bend such that the third portion of the facing extends along a bottom surface of the core that is opposite to the first primary surface.
a-1e show a panel structure made according to an embodiment of the invention;
f is a top cross-sectional view showing a portion of the core of a panel in accordance with a preferred embodiment of the invention;
a-2e show a panel structure made according to another embodiment of the invention;
a-8b show enlarged views of the panel structure of
Referring to
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Further, a portion of the facing 120 that corresponds to a lower edge 140 of the side surface 110c of the low-density core 110 can be scored. Similarly, any blade or device can be used for scoring the high-density facing 120, such as, e.g., a circular blade 160. The blade 160 can be separate from blade 150, such that both parts of the facing 120 (that correspond to the upper edge 130 and lower edge 140) can be scored simultaneously, or one blade can be used to score both portions.
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In one embodiment, the facing 120 can be extended to cover a bottom surface 110b of the low-density core 110, and can also be extended to cover the other three side surfaces of the low-density core 110 as well. In another embodiment, a second facing of high-density sheet material can be provided, similar to the first facing 120, that extends along the primary bottom surface 110b, the first facing 120 can be affixed to an outer surface of the second facing on the bottom surface 110b.
Referring now to
Furthermore, the material from which facings (e.g., 120, 220, 270) are made are preferably significantly denser than the core, due to their configuration, although they can be made of the same material. In the preferred embodiment, the facings generally do not have airspace within the sheet material, and are made of a solid paper material. In some embodiments, the facings can be made with a material having less than 25% airspace, and preferably less than 10% airspace. Examples of the density of the facings are between 31 lb./1000 sq. ft. and 90 lb./sq. ft., and preferably about 56 lb./1000 sq. ft. The facings are preferably made of a single sheet of material, but may be made of multiple plies, for instance.
Various adhesives can be used to adhere the facings to the honeycomb core, such as PVA glue, EVA glue, water based adhesives, starch based adhesives, HotMelt®, and solventless adhesives. Preferred embodiments may utilize PVA glue, especially as between honeycomb walls 660. The thickness of the disclosed facings may vary, for example, between 0.00788 inches in the case of a 31 lb./1000 sq. ft. density layer, and 0.02728 inches in the case of a 90 lb./1000 sq. ft. density layer. In preferred embodiments, the thickness may vary linearly between 0.00788 inches and 0.02728 inches for layer densities between 31 and 90 lb./sq. ft., as the thickness may vary generally linearly in proportion to density.
The panel or pallet structure of the preferred embodiment is capable of handling loads up to about 2000, 2250, or 2500 lbs. All portions of the panel or pallet structure, including the facings and core, can be made of sheet material, such as paper material, which can provide savings on shipping costs and can be recyclable and biodegradable, and can provide a lightweight, low-cost structure. Furthermore, the use of paper materials can be cost competitive to materials such as wood, metal, and plastic, while at the same time offering benefits that are not available through the use of traditional wood materials. Paper products can be made lighter than wood, plastic, or metal products, and when formed into a honeycomb structure may have remarkable strength. Because of the ease of working with paper materials and the availability of various honeycomb structures, products can be manufactured in a variety of shapes and sizes to meet any particular requirements. Exemplary honeycomb panels which may be used with the present disclosure include those which are produced under the Hexacomb® brand by Pregis Corporation. Other embodiments of the panel structure described above are also possible.
Referring now to
Referring now to
c depicts the scored portions 120c and 120d, with the portion of facing 120 which extends beyond scored portion 120d folded at scored portion 120d.
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At
Although the shape of the low-density core 110 is four-sided, such a square or rectangular shape, one of ordinary skill in the art would understand that other such shapes can be provided, such as polygonal, circular, triangular, etc., and are not limited to such. The laminated low-density core 110 and facing 120 can cooperatively resist bending loads and loads along the primary upper surface 110a and the side surface 110c, as well as the primary bottom surface 110b.
The upper surface 110a of the low-density core 110 can be configured to vertically support weight of a load that is supported on the upper surface, and one or more side surfaces 110c can be configured to protect the panel structure 100 from any force or impact against the side surface 110c. In the embodiment shown, the honeycomb structure of the low-density core 110 can be sufficiently strong to withstand typical vertical forces applied. This is assisted by the vertical orientation of the honeycomb walls of the low-density core 110, and their association with each other at non-parallel angles in the horizontal direction.
The honeycomb structure of the low-density core 110, however, are typically more prone to crushing or puncturing due to impacts, especially in a horizontal direction, or perpendicular to the honeycomb walls. For instance, exposed portions of the honeycomb low-density core 110 may crumple when exposed to a force or impact along the horizontal sides. The scoring and folding of the facing 120 along the side surface 110c of the low-density core 110 provide protection that has been found to be greater than just providing a wrap around the low-density core 110. The actual scoring and subsequent folding provides the side surface 110c of the low-density core 110 with stronger resistance to any impact along the side surface of the panel structure 100.
One of ordinary skill in the art would understand that different surfaces can be protected using the scoring/folding technique described above. For example, it may be important to protect the side surface 110c of the low-density core 110. In some embodiments it may be important to protect side surface 110c and a side surface opposite side surface 110c, and/or a side surface adjacent to the side surface 110c. The scoring and folding technique described above has been found to be stronger and more resistant to tearing and/or crushing than simply folding a sheet around a low-density core 110.
The pallet structure 200 shown in
The facing 220 can be provided along an upper surface of the low density core 210, which can sustain a load that is placed normal to the upper surface of the low density core 210. The facing 220 can be laminated on the upper surface of the low density core 210, and can be scored and folded along an upper edge 230 (scored fold 230a) and lower edge 240 (scored fold 240a) of the low density core 210. The facing may extend beyond the fold about the lower edge 240, to an area 265 on the lower surface of the deck between the edge 240 and the runner 250. Such scoring and folding can provide for resistance to impacts in a horizontal direction to the side surface 215 of the pallet structure 200. A similar scoring and folding technique can be applied to the opposite side surface of the pallet structure 200, and the facing may extend on a portion or all of the bottom surface of the low-density core 210.
The runners 250 can also comprise a low density structure, such as one or more layers of a honeycomb structure. Paper material may be provided between layers of honeycomb structure of the runners 250, with adhesives therebetween to form a single solid structure as the runner 250. A facing 270 may be provided along the exterior surface of the runners 250 similar to the facing 220. The facing can be scored and folded along one or both bottom edges 260 (scored fold 260a) of the runners 250, thus providing a crisp uniform edge along the edges 260 of the runners 250. This may provide more resistance to bending, crushing, and wear/tear of the runners 250 when subjected to loads or side impacts.
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In another embodiment, as shown in
In another embodiment as shown in
At procedure 540, the first portion of the first facing can be laminated onto the core along a first primary surface in an association to cooperatively resist bending loads and loads along the primary surface. The score line can be created before the lamination, or can be created after the lamination of the first portion on the core. Then, at procedure 550, the second portion of the first facing can be bent with respect to the first portion of the facing along the score line to produce a crisp and uniform bend such that the second portion of the first facing extends on a side of the core along a secondary surface, which is non-parallel to the first primary surface, such as, e.g., a side surface of the core.
Panel structures created according to the described procedures result in panel edges between adjacent surfaces of the high density facing that have a very tight radius as compared with facing material that has been bent over the core without first scoring the material, or compared to low density sheet material bent around a core, since this will typically crush and its corners will take up a relatively large part of the edge. Scoring the high-density facing before bending around the side of the core provides bends that can take up very little of the space on the side surface of the panel, and preferably also of the portion of the principal surfaces adjacent thereto. This allows the dimensions of the panel to be tightly controlled.
With sharper edges, various benefits may be realized. These include a larger printable edge surfaces for printing textual information or displaying images. Further, a finer fold allows for more precise sorting and stacking of the panels during production and shipping. The edges of the panels may also be strengthened, meaning that the are less prone to dents or other damage during normal use.
Referring to
One having ordinary skill in the art should appreciate that there are numerous shapes and sizes of the panel structure 100 described above, for which there can be a need or desire to load items thereon according to exemplary embodiments of the present invention. Additionally, one having ordinary skill in the art will appreciate that although the preferred embodiments illustrated herein reflect a generally flat and rectangular panel structure 100, the panel structure 100 can have a variety of shapes and sizes. Also, the scored and folded facing or other sheeting can be provided on one or more sides of the panel to close off additional or all of the lateral sides of the panel.
As used herein, the terms “front,” “back,” “upper,” “lower,” “side” and/or other terms indicative of direction are used herein for convenience and to depict relational positions and/or directions between the parts of the embodiments. It will be appreciated that certain embodiments, or portions thereof, can also be oriented in other positions.
In addition, the term “about” should generally be understood to refer to both the corresponding number and a range of numbers. In addition, all numerical ranges herein should be understood to include each whole integer within the range. While an illustrative embodiment of the invention has been disclosed herein, it will be appreciated that numerous modifications and other embodiments may be devised by those skilled in the art. Therefore, it will be understood that the appended claims are intended to cover all such modifications and embodiments that come within the spirit and scope of the present invention.
The present application claims priority to U.S. Provisional Application No. 61/267,763, filed Dec. 8, 2009, the contents of which are hereby incorporated by reference in its entirety.
Number | Date | Country | |
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61267763 | Dec 2009 | US |