Insole with included aloe extract
An insole includes a layer of foam material which is infused with an aloe extract to provide relief to dry, cracked or itchy feet, facilitate cell renewal and reduce odor. The aloe extract is typically in the form of aloe barbadensis leaf juice. The foam material typically includes ethylene vinyl acetate foam although other foams may be used, such as rubber foam, latex foam, polyethylene foam and polyurethane foam.
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1. Technical Field
The present invention relates generally to footwear or shoes. More particularly, the invention relates to the insole or foot bed of a shoe. Specifically, the invention relates to an insole which is infused with aloe.
2. Background Information
The insoles of shoes come in a vast number of varieties. Shoes and insoles have been configured in an attempt to meet the various needs of numerous athletic uses, therapeutic needs and general comfort. Some of these insoles have odor absorbing characteristics.
As is well known in the art, people's feet take a great load during the many activities they undergo and also are susceptible to various skin problems and injuries. Often, a person's foot is simply dry, cracked, itchy, tired, achy and so forth. While prior art insoles address a host of problems, there is a need in the art to relieve feet which are cracked or externally injured. The present invention addresses this and other problems in the art.
BRIEF SUMMARY OF THE INVENTIONThe present invention provides a foot bed comprising: a layer of foam material; and aloe extract infused in the layer of foam material.
The insole or foot bed of the present invention is shown generally at 10 in
As shown in
Insole 10 is formed as a layer which is generally flat although it may have some curvatures as previously discussed. Insole 10 is formed of a foam or has a foam type structure which may be of an open or closed cellular structure. In the preferred embodiment, the base compound or primary component of insole 10 is ethylene vinyl acetate (EVA) although the base compound may also be a rubber foam, latex foam, polyethylene foam, polyurethane foam or other suitable compound.
An EVA foam includes EVA and typically also includes a filler, blowing or foaming agent and a cross linking agent. Various types of pigments may also be used. The present invention further includes an aloe extract which is most preferably aloe barbadensis leaf juice. In the exemplary embodiment, insole 10 is formed from a mixture of the following components wherein the percentages noted are by weight: EVA in a range of 57 to 77 percent, more typically in a range of 62 to 72 percent and typically about 67 percent; a reactive power in a range of 17 to 37 percent, more typically in a range of 22 to 32 percent and typically about 27 percent; an azo compound in the range of about 2 to 6 percent and typically about 4 percent; azodicarbonamide in a range of about 0.5 to 2.0 percent, more typically in a range of 1.0 to 1.5 percent and typically about 1.3 percent; a cross linking agent such as dicumyl peroxide in a range of about 0.1 to 1.5 percent, more typically in the range of about 0.2 to 1.0 percent and typically in a range of about 0.3 to 0.7 percent; a pigment typically up to about 2.0 percent and usually in the range of about 0.2 to 0.6 percent; and an aloe extract typically in the range of 0.5 to 3.0 percent, more typically from 1.0 to 2.0 percent and usually about 1.5 percent.
As previously noted, in the preferred embodiment the aloe extract is aloe barbadensis leaf juice. The reactive powder noted above is in the exemplary embodiment in the form of a yellowish fine powder known as VAZO 101 which is available through Valco Chemical Company LTD. in Taiwan. VAZO 101 has a zinc oxide (ZnO) content of 45 to 49 percent. Thus, the amount of zinc oxide in the mixture of the exemplary embodiment is typically in the range of about 8 to 17 percent, more typically from 10 to 15 percent and typically about 12 to 13 percent.
Insole 10 has a Shore A hardness of about 20 to 35. One of the advantages of the EVA foam is the ability to custom mold the insole to a person's foot for extra comfort and stability. Menthol or other chemicals producing a desirable scent may be added to the mixture during the production of insole 10.
The process for forming insole 10 is now described broadly. The various ingredients are mixed together typically at around atmospheric pressure so that a thorough mixing occurs. Typically, the mixing is achieved within 5 to 20 minutes. At room temperature, EVA and various other components are in a solid state while the aloe extract is in a liquid state. Thus, the mixture is heated to a temperature within the range of about 100 to 115 degrees C. in order to melt the EVA so that the EVA and aloe are in a compatible liquid state. The blowing agent is injected through injection ducts at an appropriate time and the entire mixture is then run through an extruder. Typically, the thickness of the mixture within the extruder is about 8 to 12 millimeters thick and exits through a dye which reduces the thickness to form a sheet which is about 1 millimeter thick. The sheet is baked or heated at about 120 to 135 degrees C. for approximately 60 to 75 minutes during which period the sheet expands to form a foam material which is typically about 40 to 50 millimeters thick. After this baking process, the expanded material is allowed to sit typically for at least 12 hours before a skiving or cutting process in which the expanded foam is cut into layers of a desirable thickness for use in making insole 10.
This process results in an insole 10 which is infused with aloe throughout. The aloe extract provides several advantages, including the relief of dry, cracked and itchy feet, including cracked heels. Aloe has a therapeutic characteristic which provides penetration of skin layers to speed up cell renewal. It also helps stop odors and generally rejuvenates the feet. Aloe is also safe for diabetics which thus increases the usefulness of insole 10.
In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of prior art because such terms are used for descriptive purposes and are intended to be broadly construed.
Moreover, the description and illustration of the invention is an example and the invention is not limited to the exact details shown or described.
Claims
1. A foot bed comprising:
- a layer of foam material; and
- aloe extract infused in the layer of foam material.
2. The foot bed of claim 1 wherein the aloe extract is in the form of aloe barbadensis leaf juice.
3. The foot bed of claim 2 wherein the layer comprises at least 0.5% by weight aloe barbadensis leaf juice.
4. The foot bed of claim 3 wherein the layer comprises at least 1.0% by weight aloe barbadensis leaf juice.
5. The foot bed of claim 2 wherein the layer comprises 0.5 to 3.0% by weight aloe barbadensis leaf juice.
6. The foot bed of claim 1 wherein the layer has a Shore A hardness ranging from 20 to 35.
7. The foot bed of claim 1 wherein the foam material comprises a closed cellular structure.
8. The foot bed of claim 1 wherein the foam material comprises an open cellular structure.
9. The foot bed of claim 1 wherein the layer comprises one of rubber foam, latex foam, polyethylene foam and polyurethane foam.
10. The foot bed of claim 1 wherein the layer comprises ethylene vinyl acetate.
11. The foot bed of claim 10 wherein the layer comprises at least 50% by weight ethylene vinyl acetate.
12. The foot bed of claim 11 wherein the layer comprises 57 to 77% by weight ethylene vinyl acetate.
13. The foot bed of claim 10 wherein the layer comprises VAZO 101.
14. The foot bed of claim 13 wherein the layer comprises 17.0 to 37.0% by weight VAZO 101.
15. The foot bed of claim 10 wherein the layer comprises 8.0 to 17.0% by weight zinc oxide.
16. The foot bed of claim 10 wherein the layer comprises a cross linking agent.
17. The foot bed of claim 16 wherein the cross linking agent is dicumyl peroxide.
18. The foot bed of claim 16 wherein the layer comprises zinc oxide.
19. The foot bed of claim 10 wherein the layer comprises an azo compound.
20. The foot bed of claim 1 wherein the layer comprises a chemically reacted blowing agent.
Type: Application
Filed: Oct 31, 2007
Publication Date: Apr 30, 2009
Applicant: Mitchellace, Inc. (Portsmouth, OH)
Inventor: Steven W. Keating (West Portsmouth, OH)
Application Number: 11/981,057