Patent Application
20170303629
A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to any reproduction by anyone of the patent disclosure, as it appears in the United States Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever.
The present invention relates to a slipper, and more particularly to a non-toxin adhesiveless slipper and its processing method.
Traditional shoe soles are made of rubber materials and vulcanizing agents, such as butadiene rubbers and styrene-butadiene rubbers, and then the processing oil and the silicon dioxide are added into the rubber materials and the vulcanizing agents to process the regular vulcanization to form raw materials for the shoe soles, wherein these raw materials have a good abrasion resistance. However, these raw materials have several drawbacks. These raw materials for shoe soles are not thermoplastic materials, and cannot be recycled.
Thermoplastic rubbers are well-known recyclable materials. In other words, the thermoplastic rubbers are eco-friendly materials. Therefore, the thermoplastic rubbers can be used to replace the traditional shoe sole materials (styrene-butadiene rubbers and butadiene rubbers).
In addition, in the traditional manufacturing process for the slipper, an upper portions of the slippers are bonded on the shoe soles by glues. However, gases may retained inside the glues to reduce the adhesive ability of the glues. In this manner, the upper portions of the slippers are easily to be detached from the shoe soles, especially after the slippers are soaked into the water. During the manufacturing process, the glues are always toxic substances, so the glues not only is harmful for the human bodies, but also is a non-eco-friendly materials. Therefore, an adhesiveless slipper is highly desired in order to solve the above mentioned problems.
The invention is advantageous in that it provides a non-toxin adhesiveless slipper, wherein an upper portion and a lower portion of the non-toxin adhesiveless slipper are made of eco-friendly material, and in such a manner, the non-toxin adhesiveless slipper can be recycled.
Another advantage of the invention is to provide a non-toxin adhesiveless slipper, wherein an adhesive film is provided to attach on a bottom surface of the upper portion for bonding the lower portion of the non-toxin adhesiveless slipper with the upper portion thereof, and in other words, no glue is applied in the present invention.
Another advantage of the invention is to provide a non-toxin adhesiveless slipper, wherein no toxic substance is released and applied during the upper portion thereof and the lower portion thereof are attached with each other, so as to reduce the possibility for polluting the environment.
Another advantage of the invention is to provide a non-toxin adhesiveless slipper, wherein no expansive or complicated structure is required to employ in the present invention in order to achieve the above mentioned advantages. Therefore, the present invention successfully provides an economics and efficient solution for providing more eco-friendly slippers without affecting the main structure of the slippers.
Additional advantages and features of the invention will become apparent from the description which follows, and may be realized by means of the instrumentalities and combinations particular point out in the appended claims.
According to the present invention, the foregoing and other objects and advantages are attained by a non-toxin adhesiveless slipper, comprising:
an upper portion and a lower portion; wherein
the upper portion and the lower portion are bonded with each other by an adhesive film.
In accordance with another aspect of the invention, the present invention comprises a processing method for bonding a upper portion and a lower portion of a non-toxin adhesiveless slipper with each other, wherein the processing method comprises steps of:
a. heat melting the EVA and the EAA to form a fluid compound, and blowing the fluid compound on a bottom surface of the upper portion of the non-toxin adhesiveless slipper to form an adhesive film;
b. placing an isolated paper on the adhesive film;
c. placing the upper portion (the adhesive film and the isolated paper are already placed thereon) into a heat-pressing machine for 16-20 seconds, and the temperature of the heat-pressing machine is around 150° C. to 180° C., so as to ensure the adhesive film and isolated paper securely attached on the bottom surface of the upper portion;
d. placing a rubber sheet on a mold to process a heat pressing for 45-60 seconds, and the pressing temperature is around 150° C. to 180° C., and then removing the remaining rubbers on the contours of the mold to obtain a lower portion of the non-toxin adhesiveless slipper; and
e. placing the upper portion and the lower portion into a sectional die, and then processing the heat-pressing for 240-300 seconds, and the heat-pressing temperature is around 150° C. to 200° C. in order to combine the upper portion and the lower portion to form an integrity.
Still further objects and advantages will become apparent from a consideration of the ensuing description and drawings.
These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.
The following description is disclosed to enable any person skilled in the art to make and use the present invention. Preferred embodiments are provided in the following description only as examples and modifications will be apparent to those skilled in the art. The general principles defined in the following description would be applied to other embodiments, alternatives, modifications, equivalents, and applications without departing from the spirit and scope of the present invention.
A non-toxin slipper according to a preferred embodiment of the present invention is illustrated, wherein the non-toxin slipper comprises an upper portion and a lower portion, wherein the upper portion is embodied as a shoe pad and the lower portion is embodied as a shoe sole. The main materials of the lower portion are natural rubbers and ethylene propylene rubbers. The raw materials of the lower portion comprises natural rubber, ethylene propylene rubbers, white mineral oil, white carbon, polypropylene, starch-filled substance, vulcanization accelerator, and stearic acid, and the weight ratio of the natural rubber, ethylene propylene rubbers, white mineral oil, white carbon, polypropylene, starch-filled substance, vulcanization accelerator, and stearic acid is 40:33:17:5:5-15:6-15:2-5:3.
It is worth to mention that the lower portion of the non-toxin adhesiveless slipper can be made of synthetic rubbers. Furthermore, the lower portion of the non-toxin adhesiveless slipper also can be made of the thermoplastic polyolenfin, wherein the thermoplastic polyolenfin comprises ethylene propylene, white mineral oil, and isoprene, wherein the weight ratio of the ethylene propylene, white mineral oil, and is 33-37:14-17:46-53.
Accordingly, the upper portion of the non-toxin adhesiveless slipper are made of EVA components, wherein the EVA components comprises EVA, polyoxyethylene, filling agent, natural particles, cross-linking agent, zinc oxide, foaming agent, and stearic acid, wherein the weight ratio of EVA, polyoxyethylene, filling agent, natural particles, cross-linking agent, zinc oxide, foaming agent, and stearic acid is 10-20:30-40:10-15:30-40:0.5-5.5:2.0-3.0:0.8-5.8:10-20.
Accordingly, the lower portion and the upper portion of the non-toxin adhesiveless slipper are bonded with each other by an adhesive film, wherein the adhesive film is a non-toxin adhesive film. The adhesive film is a compound film which is made of EAA(ethylene acrylic acid) and EVA (ethylene-vinyl acetate), and the weight ratio of EAA and EVA is 80-86:14-20. It is worth to mention that the adhesion rate of the adhesive film is larger than the PE (polyethylene) film. Alternatively, the adhesive film also can be a composite PE film, wherein the composite PE film comprises low density polyethylene and linear and low density polyethylene.
A processing method for bonding the upper portion of the non-toxin adhesiveless slipper on the lower portion of the non-toxin adhesive slipper according to the above mentioned preferred embodiment of the present invention is illustrated, wherein the processing method comprises steps of:
a. heat melting the EVA and the EAA to form a fluid compound, and blowing the fluid compound on a bottom surface of the upper portion of the non-toxin adhesiveless slipper to obtain an adhesive film;
b. placing an isolated paper on the adhesive film;
c. placing the upper portion (the adhesive film and the isolated paper are already placed thereon) into a heat-pressing machine for 16-20 seconds, and the temperature of the heat-pressing machine is around 150° C. to 180° C., so as to ensure the adhesive film and isolated paper securely attached on the bottom surface of the upper portion.
d. placing a rubber sheet on a mold to process a heat pressing for 45-60 seconds, and the pressing temperature is around 150° C. to 180° C., and then removing the remaining rubber on the contours of the mold to obtain a lower portion of the non-toxin adhesiveless slipper; and
e. placing the upper portion and the lower portion into a sectional die, and then processing the heat-pressing for 240-300 seconds, and the heat-pressing temperature is around 150° C. to 200° C. in order to combine the upper portion and the lower portion to form an integrity.
In the step a, the adhesive film is a porous film. It is worth to mention that some gases may be released after the EVA material is heated, so the gases may attached on the adhesive film to cause the broken film, and then the adhesive ability of the adhesive film will be reduced.
In the step d, the sizes and shapes of the lower portion of the non-toxin adhesiveless slipper are the same as that of the upper portion thereof.
The non-toxin adhesiveless slipper prepared according to a preferred embodiment of the present invention is tested by the following toxic substance: alkylphenol & alkylphenolethoxylate, banned azo dyes, chlorobenzene and chlorotoluene, chlorophenols, chlorinated solvents, flame retardant, heavy metals, organotin compounds, phthalates, perfluorooctanesulfonates & perfluorooctanoic acid, and shot-chain chlorinated paraffins. The non-toxin adhesiveless slipper is tested which comprises the upper portion M1 and the lower portion M2.
The test method for alkylphenol & alkylphenolethoxylate is performed as specified in ISO 18218 (modified). The results from the upper portion M1 and the lower portion M2 are shown in Table 1. Remark:-n.d.=not detected.
The test method for banned azo dyes is performed as specified in GB/T 17592-2011 & GB/T 23344-2009 for 4-aminozobenzene (modified). The results from the upper portion M1 and the lower portion M2 are shown in Table 2. Remark:-n.d.=not detected.
It is worth to mention that 4-amino-2′,3-dimethylazobenzene (CAS No. 97-56-3) and 5-nitro-o-toluidine (CAS No. 99-55-8) are further reduced into o-toluidine (CAS No. 95-53-4) and 4-methyl-m-phenylenediamine (CAS No. 95-80-7). In case of that polyurethane materials are used, it cannot be ruled out that certain amines, e.g. 4,4′-methylenedianiline (MDA, CAS No. 101-77-9) and 4-methyl-m-phenylenediamine (TDA, CAS No. 95-80-7) are released from the PU component and not from a banned azo colorant.
The test method for chlorobenzene and chlorotoluene is performed as specified in GB/T 20384-2006 (modified). The results from the upper portion M1 and the lower portion M2 are shown in Table 3. Remark:-n.d.=not detected.
The test method for chlorophenols is performed as specified in ISO 17070: 2015 (IULTCS/IUC 25). The results from the upper portion M1 and the lower portion M2 are shown in Table 4. Remark:-n.d.=not detected.
The test method for chlorinated solvent is performed as specified in EPA SW-846 Method 3550C, GCMS/GC-ECD. The results from the upper portion M1 and the lower portion M2 are shown in Table 5. Remark:-n.d.=not detected.
indicates data missing or illegible when filed
The test method for flame retardant is performed as specified in GB/T 26125-2011. The results from the upper portion M1 and the lower portion M2 are shown in Table 6. Remark:-n.d.=not detected.
indicates data missing or illegible when filed
The test method for heavy metals is performed as specified in QB/T 4340-2012. Analyzed by ICP-MS. The results from the upper portion M1 and the lower portion M2 are shown in Table 7. Remark:-n.d.=not detected.
The test method for organotin compounds is performed as specified in ISO/TS 6179:2012. The results from the upper portion M1 and the lower portion M2 are shown in Table 8. Remark:-n.d.=not detected.
The test method for phthalates is performed as specified in ISO/TS 16181:201. The results from the upper portion M1 and the lower portion M2 are shown in Table 9. Remark:-n.d.=not detected.
indicates data missing or illegible when filed
The test method for perfluorooctanesulfonates & perfluorooctanoic Acid is performed as specified in CEN TS 15968: 2010(E). The results from the upper portion M1 and the lower portion M2 are shown in Table 10. Remark:-n.d.=not detected.
The test method for short-chain chlorinated paraffins is performed as specified in ISO 18219:2015 (modified). The results from the upper portion M1 and the lower portion M2 are shown in Table 11. Remark:-n.d.=not detected.
indicates data missing or illegible when filed
Referring to Table 1 to Table 11, no toxic substances, such as alkylphenol & alkylphenolethoxylate, banned azo dyes, chlorobenzene and chlorotoluene, chlorophenols, chlorinated solvents, flame retardant, heavy metals, organotin compounds, phthalates, perfluorooctanesulfonates & perfluorooctanoic acid, and shot-chain chlorinated paraffins, are detected on both the upper portion and lower portion of the non-toxin adhesiveless slipper in the present invention. Therefore, the non-toxin adhesiveless slipper of the present invention is an eco-friendly slipper, which fulfills th future environmental trends.
One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting.
It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.
