Environment-friendly slippers and manufacturing process thereof

Abstract

The invention relates to the technical field of slippers, and discloses an environment-friendly slipper and a manufacturing process thereof.The manufacturing process includes the steps that manufacturing raw materials are manufactured into an upper semi-finished product and a sole semi-finished product respectively, a sinking area is formed on the top face of the upper semi-finished product, a plurality of protrusions protruding downwards are formed on the sole semi-finished product, and pit areas are formed on the top face of the sole semi-finished product by the protrusions; the shoe upper semi-finished product is subjected to a punching procedure, and trimming margins are reserved on the two sides of the punched shoe upper semi-finished product; the assembling edges on the two sides of the punched semi-finished shoe upper are embedded into the sunken assembling area of the semi-finished shoe sole and connected and fixed through sewing, and a slipper with the edge to be cut is formed; and punching the slippers to be trimmed. According to the slipper, the assembling problem of the formed sole and the upper is solved, the supporting thickness of the sole is guaranteed through the protrusions, the protrusions crumple after being stressed, the road holding force of the sole is improved through the formed adsorption area, and the slipper can be recycled and reproduced, can be completely degraded and is environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of slipper technology, and more specifically, to an environmentally friendly slipper and its manufacturing process. Background Technology

[0002] In the field of daily necessities, especially disposable slippers widely used in industries such as hotels and aviation, as well as household slippers, are usually made of disposable plastic or textile products, which are difficult to degrade and pollute the environment, posing unresolved environmental and resource issues.

[0003] Currently, the most common slippers on the market fall into two main categories: 1. Disposable slippers: These are primarily made of non-woven fabric, thin fleece, or plastic film. Their advantages include low cost and ease of use, but they suffer from drawbacks such as loose structure, easy deformation and damage, poor comfort and support. Furthermore, most still contain synthetic fibers or plastic components, which are difficult to degrade in the natural environment, generating a large amount of waste after disposal, which does not meet the requirements of a green circular economy. 2. Traditional textile or foam slippers: While these products offer improved durability and comfort, their production process typically involves petrochemical raw materials such as EVA (ethylene-vinyl acetate copolymer), PVC (polyvinyl chloride), and synthetic fiber fabrics. The production process is energy-intensive and generates significant carbon emissions. Moreover, these materials are difficult to recycle and dispose of after disposal, with most ultimately ending up in landfills or the natural environment, causing long-term pollution.

[0004] Pulp molding is an environmentally friendly process that uses plant fibers (such as recycled pulp, sugarcane pulp, bamboo pulp, etc.) to create three-dimensional products through molding, hot pressing, and drying. Products produced using this technology have significant advantages, including renewable raw materials, fully biodegradable products, and a relatively environmentally friendly production process. However, when applied to slippers, which require high structural strength, mechanical properties, wearing comfort, and aesthetic details, the following technical bottlenecks are encountered: 1. Traditional pulp molding products are mostly used for simple containment or cushioning, and their structural design struggles to meet the ergonomic requirements of the human foot for support and flexion; 2. Due to the material itself, pulp molding products have weaker friction and grip compared to materials like foam and rubber; 3. Due to production process limitations, the thickness of a single-layer pulp molding product is generally 0.8mm to 1.2mm. 4. As the sole material is relatively thin, the sole is easily affected by foreign objects on the ground. Multi-layer bonding will result in an excessively thick sole that cannot bend, reducing comfort. 5. Pulp molding products usually have two edge cutting methods: flat cutting and rotary cutting. Both cut edges are relatively flat and sharp. Due to the limitation of the edge cutting method, the comfort of the instep contacting the cut edge of the shoe upper is poor. 6. When producing slippers with complex three-dimensional structures (such as slippers that combine sole and upper), the existing mold design and hot pressing process of pulp molding are difficult to achieve one-piece molding. Molding the sole and upper separately will face the problem of assembly.

[0005] Therefore, it is necessary to propose an environmentally friendly slipper and its manufacturing process to at least partially solve the problems existing in the current technology. Summary of the Invention

[0006] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To at least partially solve the above problems, the present invention provides a manufacturing process for environmentally friendly slippers, comprising: The raw materials are made into semi-finished shoe uppers and semi-finished shoe soles. The top surface of the semi-finished shoe uppers forms a sunken area, and the semi-finished shoe soles form multiple downward protrusions. The protrusions form a pit area on the top surface of the semi-finished shoe soles. When subjected to external force, part of the protrusions collapses, forming an upwardly concave adsorption area. The semi-finished shoe upper is punched, so that the punched semi-finished shoe upper has a cutting allowance on both sides; The assembly edges on both sides of the punched upper semi-finished product are embedded into the sunken assembly area of ​​the sole semi-finished product and fixed by stitching to form the slipper to be cut. The cut edges of the slippers are then punched.

[0008] Preferably, the raw material used in the manufacturing process is plant fiber; The plant fibers include one or more combinations of bamboo pulp, sugarcane pulp, reed pulp, grass pulp, waste paper pulp, and wood pulp.

[0009] Preferably, the raw material used in the manufacturing process is plant fiber; The plant fiber comprises: 55% to 75% of a first raw material and 25% to 45% of a second raw material; The first raw material is bamboo pulp, and the second raw material is one or more combinations of sugarcane pulp, reed pulp, straw pulp, waste paper pulp, and wood pulp.

[0010] Preferably, the semi-finished shoe upper is punched sequentially using a first punching die and a second punching die, including: The semi-finished shoe upper is positioned on the lower die base of the first punching die, and the outer periphery of the semi-finished shoe upper is punched for the first time using the upper die head of the first punching die. The semi-finished shoe upper after the first punching is positioned on the second punching lower die base of the second punching die, and the arc surfaces at both ends of the semi-finished shoe upper are punched using the second punching upper upper die head of the second punching die.

[0011] Preferably, the first punching die base is provided with a positioning part, and the outer peripheral area of ​​the shoe upper semi-finished product is provided with an upwardly recessed positioning groove, wherein the positioning part corresponds to the positioning groove; The second punching lower die base is provided with a positioning groove corresponding to the sinking area, and the second punching upper die head is provided with a first arc-shaped cut and a second arc-shaped cut respectively corresponding to the front end and the rear end of the second punching lower die base.

[0012] Preferably, the slippers to be cut are punched using a third punching die, including: The slipper to be cut is positioned on the lower die base of the third punching die, and the upper die head of the third punching die is used to punch the slipper to be cut. The third punching die base is provided with a punching groove, and a plurality of limiting blocks are provided on the outer side of the punching groove. The bottom of the slipper to be cut is provided with an upwardly recessed limiting area, and the limiting area is correspondingly set with the limiting blocks.

[0013] An environmentally friendly slipper, comprising: The sole has multiple downward protrusions distributed on it, and the protrusions form a recessed area on the top surface of the sole. The sole has recessed mounting areas on both sides. The upper has mounting edges on both sides that connect to the sunken mounting area; The protrusion includes a support root and a deformable top. The support root is located near the bottom surface of the sole. The deformable top collapses when subjected to external force, forming an upwardly concave adsorption area.

[0014] Preferably, the bottom surface of the sole is provided with a support platform, and the downward protrusion of the support platform is less than the downward protrusion of the non-collapsed protrusion.

[0015] Preferably, the top surface of the sole is provided with a contact isolation layer.

[0016] Preferably, the upper is a rigid body made using a pulp molding process, or the upper is a flexible body made of plant fibers; When the upper is a rigid body, its top surface has a recessed area, and the bottom surface of the recessed area contacts the instep.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: The environmentally friendly slippers and their manufacturing process described in this invention solve the assembly problem of separately molded soles and uppers. The resulting environmentally friendly slippers, through the design of multiple protrusions, ensure the support thickness of the sole, providing good support for the human foot. The sole can also bend and deform, improving comfort. Furthermore, the protrusions can collapse under pressure, forming an adsorption area that enhances the grip of the sole and provides anti-slip properties. The recessed area formed on the upper can contact the instep, preventing the instep from contacting the front and rear edges of the upper, further improving comfort. The sole and upper are molded separately and then assembled by stitching, ensuring the strength of the bond between the two. In addition, compared with traditional slipper materials, the environmentally friendly slippers can be recycled and reused, exhibiting significant economic, environmental, and practical value. The disposable slippers made entirely of plant fiber in this invention are completely biodegradable, environmentally friendly, and can solve the need for recycling from the source. After the protrusions collapse, their appearance will change. New slippers will have intact protrusions, while the protrusions on used slippers will collapse due to stress and cannot spring back to their initial state, nor can they be repaired. This makes it easy to identify whether the slippers are new, thereby preventing hotels or businesses from providing disposable slippers that have been used by others and ensuring the user experience.

[0018] The environmentally friendly slippers and their manufacturing process described in this invention, as well as other advantages, objectives and features of this invention, will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of the manufacturing process of the environmentally friendly slippers described in this invention; Figure 2 This is a schematic diagram of the structure in which the semi-finished upper is placed on the first punching die in the manufacturing process of the environmentally friendly slippers described in this invention. Figure 3 This is an exploded structural diagram of the first punching die punching the semi-finished upper in the manufacturing process of the environmentally friendly slippers described in this invention. Figure 4 This is an exploded structural diagram of the second punching die punching the semi-finished upper in the manufacturing process of the environmentally friendly slippers described in this invention. Figure 5 This is an exploded structural diagram of the third punching die before punching the edge of the slipper to be cut in the manufacturing process of the environmentally friendly slippers described in this invention. Figure 6This is an exploded structural diagram of the third punching die after punching the edge of the slipper to be cut in the manufacturing process of the environmentally friendly slippers described in this invention. Figure 7 This is a structural schematic diagram of the environmentally friendly slippers described in this invention; Figure 8 This is an exploded structural diagram of the environmentally friendly slippers described in this invention; Figure 9 This is a schematic diagram of the bottom structure of the environmentally friendly slippers described in this invention; Figure 10 This is a cross-sectional structural diagram of the environmentally friendly slippers described in this invention; Figure 11 This is a schematic diagram of the protrusion structure in the environmentally friendly slippers described in this invention; Figure 12 This is a schematic diagram of the structure of the environmentally friendly slippers described in this invention after the protrusion collapses under stress. Figure 13 This is a schematic diagram of another structure of the environmentally friendly slippers described in this invention.

[0020] In the attached drawings, 1 is the sole, 2 is the upper, 3 is the protrusion, 31 is the support base, 32 is the deformable top, 33 is the adsorption area, 4 is the recessed area, 5 is the sunken assembly area, 6 is the assembly edge, 7 is the support platform, 8 is the arch support curved surface, 9 is the sunken area, 10 is the semi-finished upper, 101 is the outer periphery area, 11 is the semi-finished sole, 12 is the first punching lower die base, 121 is the positioning part, 13 is the first punching upper die head, 14 is the second punching lower die base, 141 is the limiting groove, 15 is the second punching upper die head, 151 is the first arc-shaped cut, 152 is the second arc-shaped cut, 16 is the third punching lower die base, 161 is the punching groove, 162 is the limiting block, and 17 is the third punching upper die head. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0022] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] like Figures 1-12 As shown, the present invention provides a manufacturing process for environmentally friendly slippers, including: S1. The raw materials are made into shoe upper semi-finished product 10 and shoe sole semi-finished product 11 respectively, so that the top surface of the shoe upper semi-finished product 10 forms a sunken area 9, and the shoe sole semi-finished product 11 forms multiple downward protrusions 3, and the protrusions 3 form a pit area 4 on the top surface of the shoe sole semi-finished product 11; after being subjected to external force, part of the protrusions 3 collapses, forming an upwardly concave adsorption area 33. S2. Perform a punching process on the semi-finished shoe upper 10 so that the punched semi-finished shoe upper 10 has a cutting allowance on both sides. S3. The assembly edges 6 on both sides of the punched upper semi-finished product 10 are embedded into the sunken assembly area 5 of the sole semi-finished product 11, and fixed by stitching to form a slipper to be cut. Among them, the assembly edges 6 on both sides of the shoe upper semi-finished product 10 are the cutting allowance left in step S2; the width of the assembly edge 6 and the recessed assembly area 5 is less than 5mm. S4. Perform a punching process on the slippers to be cut.

[0024] The raw materials used in the production can be any environmentally friendly material available in the prior art, with plant fibers being the preferred choice.

[0025] Pulp molding is a process that uses plant fibers as raw materials to make pulp, and then uses methods such as vacuum forming or injection molding to shape the desired shape using a mold. Finally, it is hot-pressed and dried to produce a three-dimensional product. In this invention, pulp molding is used to make shoe upper semi-finished product 10 and shoe sole semi-finished product 11. Then, the shoe upper semi-finished product 10 is punched. The assembly edge 6 of the punched shoe upper semi-finished product 10 and the sunken assembly area 5 of the shoe sole semi-finished product 11 are first bonded with adhesive spray and then sewn together with stitching. After the two are assembled, a slipper to be trimmed is formed. Finally, the edges are trimmed as a whole to obtain the finished slipper.

[0026] Specifically, in step S3, to ensure the bonding strength between the assembly edge 6 and the sunken assembly area 5, a modified non-standard edge-sealing sewing machine is used for sewing during the sample shoe production stage. The thickness of the presser foot, feed dog, and limiting end cap of the sewing machine is reduced through wire cutting technology so that the assembly edge 6 and the sunken assembly area 5 can fully enter the effective sewing area of ​​the sewing machine. In addition, to achieve large-scale and efficient production, computer-controlled pattern sewing equipment can be selected in the mass production stage. Two-dimensional sewing paths adapted to the assembly edge 6 and the sunken assembly area 5 are generated through pre-programming, and with the help of special sewing fixtures, the assembly of the upper semi-finished product 10 and the sole semi-finished product 11 is completed in an automated manner.

[0027] The slipper's upper 2 has a recessed area 9 on its top surface. The recessed area 9 is formed by pulp molding. The bottom surface of the recessed area 9 is set lower than the inner arc surface of the upper 2, so that the bottom surface of the recessed area 9 contacts the instep first, thereby preventing the front and rear edges of the upper 2 from getting stuck on the instep. The sole 1 of the manufactured slippers has multiple protrusions 3 distributed on it. The protrusions 3 form a recessed area 4 on the top surface of the sole 1. The protrusions 3 and the recessed area 4 are formed by pulp molding process. When walking in the slippers, the protrusions 3 will come into contact with the ground and be subjected to external force. The part of the protrusions 3 away from the sole 1 will collapse, causing the protrusions 3 to form an indentation on the bottom. An adsorption area 33 is formed at the bottom. When walking in the slippers, the adsorption area 33 can generate negative pressure, thereby forming a certain gripping force with the ground to increase the friction of the sole 1 and play a role in anti-slip.

[0028] In addition, before the sole 1 is assembled with the upper 2, the edge of the sole 1 can be punched and cut to make it usable as a disposable massage insole, which can provide foot massage and sweat absorption. By employing the aforementioned manufacturing process, the assembly problem of separately molded sole 1 and upper 2 is solved. The resulting environmentally friendly slippers, through the design of multiple protrusions 3, elevate the contact surface between sole 1 and the foot, preventing the sole from being directly affected by ground debris. This solves the problem of sole 1 being too thick and unable to bend due to the need for multiple layers of pulp molding structure to prevent the sole from being affected by ground debris. It ensures the support thickness of sole 1, providing good support for the human foot. Furthermore, sole 1 can bend and deform, improving comfort. The protrusions 3 can collapse under pressure, forming an adsorption area 33 that enhances the grip of the sole and provides anti-slip properties. The sunken area 9 formed on the upper 2 can contact the instep, preventing the instep from contacting the front and rear edges of the upper 2, further improving comfort. The sole 1 and upper 2 are molded separately and then assembled by stitching, ensuring the bonding strength between the two. In addition, compared with traditional slipper materials, environmentally friendly slippers can be recycled and reused, exhibiting significant economic, environmental, and practical value.

[0029] In one embodiment, the raw material used in the production is plant fiber; The plant fibers include one or more combinations of bamboo pulp, sugarcane pulp, reed pulp, grass pulp, waste paper pulp, and wood pulp.

[0030] The environmentally friendly slippers of this invention use environmentally friendly materials, preferably 100% plant fiber as raw material. Plant fiber comes from nature and can be completely biodegradable, making it green and environmentally friendly. During production, raw materials such as bamboo pulp, sugarcane pulp, reed pulp, grass pulp, waste paper pulp, and wood pulp are dispersed and pulped according to the proportion to prepare a pulp of a certain concentration for molding.

[0031] In one embodiment, the raw material used in the production is plant fiber; The plant fiber comprises: 55% to 75% of a first raw material and 25% to 45% of a second raw material; The first raw material is bamboo pulp, and the second raw material is one or more combinations of sugarcane pulp, reed pulp, straw pulp, waste paper pulp, and wood pulp.

[0032] The present invention preferably uses virgin bamboo pulp as the core raw material, accounting for more than 50%, and in this embodiment, 55% to 75% bamboo pulp is preferred, to maintain the natural characteristics of bamboo fiber and increase the physical and mechanical properties, anti-slip properties, etc. of the product. Bamboo is a fast-growing herbaceous plant and a renewable resource. Sugarcane juice is made from the waste residue after sugarcane is extracted. The microporous structure inside bamboo fiber has excellent breathability and moisture absorption, which can quickly absorb and release sweat. Bamboo fiber is rich in natural antibacterial substances, namely bamboo quinone, which can effectively inhibit the growth and reproduction of bacteria, fungi and microorganisms.

[0033] like Figures 2-4 As shown, in one embodiment, the shoe upper semi-finished product 10 is subjected to a punching process using a first punching die and a second punching die in sequence, including: The shoe upper semi-finished product 10 is positioned on the first punching lower die base 12 of the first punching die, and the outer peripheral area 101 of the shoe upper semi-finished product 10 is punched for the first time using the first punching upper upper die head 13 of the first punching die. The semi-finished shoe upper 10 after the first punching is positioned on the second punching lower die base 14 of the second punching die, and the arc surfaces at both ends of the semi-finished shoe upper 10 are punched by the second punching upper upper die head 15 of the second punching die.

[0034] Among them, the semi-finished shoe upper 10, after the first punching, has its excess edge punched off again, and can also be used as a paper mold shoe tree.

[0035] Furthermore, the first punching die base 12 is provided with a positioning part 121, and the outer peripheral area 101 of the shoe upper semi-finished product 10 is provided with an upwardly recessed positioning groove, and the positioning part 121 corresponds to the positioning groove; The second punching lower die base 14 is provided with a limiting groove 141 corresponding to the sinking area 9, and the second punching upper die head 15 is provided with a first arc-shaped cut 151 and a second arc-shaped cut 152 corresponding to the front end and rear end of the second punching lower die base 14, respectively.

[0036] like Figure 2 and Figure 3As shown, the shoe upper semi-finished product 10 is placed on the first punching lower die base 12. The positioning part 121 and the positioning groove realize the positioning of the shoe upper semi-finished product 10, ensuring the accuracy of the cutting edge position. The first punching die is used to cut off the outer peripheral area 101 of the shoe upper semi-finished product 10, leaving only the cutting edge allowance for connection with the sole semi-finished product 11. like Figure 4 As shown, the first punched shoe upper semi-finished product 10 is positioned on the second punching lower die base 14, so that the sunken area 9 is placed in correspondence with the limiting groove 141 to achieve positioning and ensure the accuracy of the punching position; the first arc-shaped cut 151 and the second arc-shaped cut 152 on the second punching upper die head 15 correspond to the front end and the rear end of the second punching lower die base 14, respectively, to cut off the front end and the rear end arc surface of the shoe upper semi-finished product 10.

[0037] like Figure 5 and Figure 6 As shown, in one embodiment, the slippers to be cut are subjected to a punching process using a third punching die, including: The slipper to be cut is positioned on the lower die base 16 of the third punching die, and the upper die head 17 of the third punching die is used to punch the slipper to be cut. The third punching die base 16 is provided with a punching groove 161, and a plurality of limiting blocks 162 are provided on the outer side of the punching groove 161. The bottom of the slipper to be cut is provided with an upwardly recessed limiting area, and the limiting area is correspondingly set with the limiting block 162.

[0038] The shape and size of the punching groove 161 correspond to the shoe sole 1 after the edge cutting is completed. The upwardly recessed limiting area is set on the shoe sole semi-finished product 11, so that the slipper to be cut can be positioned on the third punching lower die base 16 to ensure the accuracy of the edge cutting position.

[0039] like Figures 7-12 As shown, the present invention also discloses an environmentally friendly slipper, comprising: The sole 1 has multiple downward protrusions 3 distributed on it, and the protrusions 3 form a recessed area 4 on the top surface of the sole 1. The sole 1 has sunken assembly areas 5 on both sides. Among them, the multiple protrusions 3 can be designed to be distributed in position according to the force requirements of the sole 1; The upper 2 has mounting edges 6 on both sides that connect to the sunken mounting area 5; The protrusion 3 includes a support root 31 and a deformable top 32. The support root 31 is located near the bottom surface of the sole 1. The deformable top 32 collapses after being subjected to external force, and the collapsed deformable top 32 forms an upwardly concave adsorption area 33.

[0040] The molding density of the plant fibers in the supporting root 31 is greater than that of the plant fibers in the deformed top 32.

[0041] Among them, a spatial area is formed between multiple protrusions 3 on the bottom surface of the sole 1.

[0042] The front end of the upper 2 can be designed as a closed end or an open end as needed. A closed end can prevent the toes from being exposed, while an open end can allow the toes to be exposed.

[0043] While fulfilling the aforementioned support and collapse functions, the protrusion 3 can be designed into any shape as needed.

[0044] Secondly, the protrusion 3 can be designed by scaling the gap of the molding die to determine the degree of solidity (density difference / strength difference) at different positions of the protrusion 3. Under the premise of satisfying the above-mentioned support and collapse functions, it can appropriately provide cushioning and wearing comfort. This design method is suitable for any design part of pulp molded products where the strength requirement is low and the body comfort requirement is high.

[0045] The height of the supporting root 31 is half the overall height of the protrusion 3. It has high strength and is not easily deformed or collapsed, thus providing support. The deformable top 32 is used to contact the ground. Its height is 2mm~3mm. Its strength is lower than that of the supporting root 31. It is easy to collapse under the weight of a person, thus providing cushioning and elasticity. The method to achieve the function of the protrusion 3 is to reduce the vacuum slots of the deformable top 32 during the mold design in the pulp molding process, resulting in insufficient local pulp absorption during pulp suction. At the same time, in the design of the gaps in the extrusion and hot pressing molds, the gaps in the molds corresponding to the deformable top 32 are left empty, reducing the compression on the deformable top 32 and reducing the number of hydrogen bonds between plant fibers in this area, thereby reducing the bond strength and making the deformable top 32 softer. This allows the deformable top 32 to collapse precisely upwards, forming an upwardly recessed adsorption area 33. In other words, the density of plant fibers in the supporting root 31 is greater than the density of plant fibers in the deformable top 32.

[0046] The protrusion 3 contacts the ground on the bottom surface of the sole 1. When walking in slippers, the edge of the concave area 4 fits the sole of the foot, massaging the sole. Furthermore, as the protrusion 3 is stepped on, the internal air pressure of the concave area 4 changes alternately, stimulating acupoints on the foot. The protrusion 3 protrudes downwards from the sole 1, giving the bottom surface of the sole 1 a spatial structure, which can produce the texture of a 6mm thick sole; the controllable collapse design of the protrusion 3 can give the sole 1 a certain degree of elasticity, improving comfort; and after collapse, the resulting suction area 33 can form a suction cup-like space, creating a negative pressure area between it and the ground, which can generate a moderate suction force with the ground when walking, making the sole 1 have an anti-slip function. In addition, depending on the different application scenarios and the requirements for anti-slip performance, waterproof performance, and strength performance of disposable slippers, no more than 6% of waterproofing agent and 0%-5% of enhanced anti-slip agent can be added during the production process. When the anti-slip performance requirements are high, anti-slip adhesive can also be applied to the surface of the protrusion 3 to provide better anti-slip performance.

[0047] After the sole 1 and upper 2 are formed separately, they are sewn together. A standard sewing machine head requires about 6mm of operating space to sew the edge. However, pulp molding cannot be folded or pressed, so the standard sewing machine head is customized and modified into a special sewing device that can sew a 2mm~3mm edge on one side. The assembly edge 6 and the recessed assembly area 5 are fixed by sewing. The recessed assembly area 5 is recessed by 1mm, so that the assembly edge 6 can be positioned and embedded in the recessed assembly area 5 to prevent displacement. In addition, the top surface of the assembly edge 6 can be flush with the top surface of the sole 1 to ensure aesthetics.

[0048] These all-plant fiber disposable slippers are completely biodegradable, environmentally friendly, and can solve the need for recycling from the source. After the protrusion 3 collapses, its appearance will change. A brand new slipper will have an intact protrusion 3, while a used slipper will have its protrusion 3 collapsed due to stress, unable to spring back to its initial state, and cannot be repaired. This makes it easy to identify whether the slippers are brand new, thus preventing hotels or businesses from providing disposable slippers that have been used by others and ensuring the user experience.

[0049] In addition, before the sole 1 is assembled with the upper 2, the edge of the sole 1 can be punched and cut to make it usable as a disposable massage insole, which can provide foot massage and sweat absorption.

[0050] In one embodiment, the front end of the upper 2 is closed, or the front end of the upper 2 is open; the height of the front end of the upper 5 is lower than the height of its rear end, and the width of the middle part of the upper 5 is greater than the width of its front end and rear end.

[0051] like Figure 9 and Figure 10 As shown, in one embodiment, the bottom surface of the sole 1 is provided with a support platform 7, and the downward protrusion height of the support platform 7 is less than the downward protrusion height of the non-collapsed protrusion 3.

[0052] The support platform 7 is arranged around the bottom surface of the sole 1, and / or the support platform 7 is arranged in the space area formed between multiple protrusions 3. The support platform 7 is set according to the support needs of the sole 1. The height difference between the protrusion 3 and the support platform 7 is preferably 1mm. When walking, the protrusion 3 will contact the ground first, and after bearing the pressure, it will collapse. When the collapse reaches 1mm, the support platform 7 on the bottom edge of the sole 1 will be subjected to force simultaneously, and together with the protrusion 3, it will play a supporting role to protect the overall structure of the sole 1 and the support stability of the protrusion 3. In addition, such as Figure 8 and Figure 9 As shown, the support platform 7 and the sunken assembly area 5 are designed to be recessed inwards, leaving space for the seam between the sunken assembly area 5 and the assembly edge 6, thus preventing the overall size of the slippers from being too large.

[0053] like Figure 10 As shown, in one embodiment, the top surface of the sole 1 has a smooth, upwardly convex arch support curve 8.

[0054] According to ergonomic design, the top surface of the sole 1 at the position corresponding to the arch of the foot is raised upward to provide support for the arch. The height difference between the corresponding protrusion 3 and the height of the protrusion 3 at other positions is 1mm~2mm. The height difference can be adjusted as needed. The bottom surfaces of all protrusions 3 are on the same plane.

[0055] like Figure 7 and Figure 13 As shown, in one embodiment, the upper 2 is a rigid body made using a pulp molding process, or the upper 2 is a flexible body made of plant fibers; When the upper 2 is a rigid body, its top surface is provided with a recessed area 9, and the bottom surface of the recessed area 9 is in contact with the instep.

[0056] The upper 2 uses a pulp molding process to make a rigid body from plant fibers, which is not easily deformed and has a certain degree of support. The upper 2 is made of plant fibers, such as bamboo fiber paper and plant fiber non-woven fabric, which are flexible and environmentally friendly materials; thus, the upper 2 can be deformed at will and can be flattened for easy carrying.

[0057] The sinking area 9 is set at the position corresponding to the instep. After wearing the slippers, the instep directly contacts the bottom surface of the sinking area 9. The bottom surface is curved. When walking in the slippers, the instep forms a height difference with the front and rear edges of the shoe upper 2, avoiding the instep directly contacting the cut edge of the shoe upper 2 and improving comfort. Subsidence area 9 can form as follows Figure 7 The regular rectangular shape shown, or the shape formed as... Figure 13 The overall sunken curved surface shown makes the front and rear edges of the shoe upper 2 higher than the sunken area 9; The top surface of the sunken area 9 can be used as a marking area, where patterns, shapes, trademarks, promotional information, etc. can be printed or pasted, such as ears or printed graphics, etc. Alternatively, when using pulp molding process to make the shoe upper 2, the required pattern can be formed in the sunken area 9 to form a distinguishable mark. When finished slippers are made in different sizes, men's and women's styles, and children's styles, they are distinguished by the overall color of the slippers or by the markings.

[0058] In one embodiment, the top surface of the sole 1 is provided with a contact isolation layer.

[0059] In this embodiment, a contact isolation layer can be selectively provided on the top surface of the sole 1 to meet different user needs. When no contact isolation layer is provided on the sole 1, the recessed area 4 can fit against the sole of the foot and thus play a massage role when walking. When a contact isolation layer is provided on the sole 1, the recessed area 4 is covered, and the sole 1 does not have a massage function.

[0060] The contact isolation layer can cover all the pitted areas 4 on the sole 1. It is a pulp molded product and is sewn to the sole 1. It is used to isolate the foot from the pitted areas 4 for users who are not comfortable with foot massage. Alternatively, to increase comfort, the contact barrier layer can be made of plant fibers, such as bamboo fiber paper or plant fiber nonwoven fabric, which are flexible and environmentally friendly materials. Alternatively, the contact isolation layer may consist of a rigid layer and a flexible layer arranged sequentially from bottom to top. The rigid layer is made of molded pulp, while the flexible layer is made of plant fibers, such as bamboo fiber paper or plant fiber nonwoven fabric, which are flexible and environmentally friendly materials that increase comfort.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the present invention, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A manufacturing process of environment-friendly slippers, characterized in that, The manufacturing raw materials are respectively made into a shoe upper semi-finished product (10) and a shoe sole semi-finished product (11), a sinking area (9) is formed on the top surface of the shoe upper semi-finished product (10), and a plurality of protrusions (3) protruding downward are formed on the shoe sole semi-finished product (11), the protrusions (3) forming a pit area (4) on the top surface of the shoe sole semi-finished product (11); A punching process is performed on the shoe upper semi-finished product (10), and a cutting edge allowance is left on both sides of the punched shoe upper semi-finished product (10); The assembly edges (6) on both sides of the punched shoe upper semi-finished product (10) are embedded into the sinking assembly area (5) of the shoe sole semi-finished product (11), and are fixed by stitching connection to form a flip-flop to be cut; A punching process is performed on the flip-flop to be cut. The manufacturing raw materials use plant fibers; 2. The manufacturing process of the environment-friendly slipper according to claim 1, characterized in that, The plant fibers include one or more combinations of bamboo pulp, cane pulp, reed pulp, grass pulp, waste paper pulp, and wood pulp. The manufacturing raw materials use plant fibers; 3. The manufacturing process of the environment-friendly slipper according to claim 1, characterized in that, The plant fibers include 55% to 75% of a first raw material and 25% to 45% of a second raw material; The first raw material is bamboo pulp, and the second raw material is one or more combinations of cane pulp, reed pulp, grass pulp, waste paper pulp, and wood pulp. A punching process is performed on the shoe upper semi-finished product (10) using a first punching die and a second punching die in sequence, including:

4. The manufacturing process of the environment-friendly slipper according to claim 1, characterized in that, The shoe upper semi-finished product (10) is positioned and placed on the first punching lower die seat (12) of the first punching die, and the first punching upper die head (13) of the first punching die is used to punch the outer peripheral area (101) of the shoe upper semi-finished product (10) for the first time; The shoe upper semi-finished product (10) after the first punching is positioned and placed on the second punching lower die seat (14) of the second punching die, and the second punching upper die head (15) of the second punching die is used to punch the arc surfaces at the front and rear ends of the shoe upper semi-finished product (10). The first punching lower die seat (12) is provided with a positioning portion (121), and the outer peripheral area (101) of the shoe upper semi-finished product (10) is provided with an upwardly recessed positioning groove, and the positioning portion (121) corresponds to the positioning groove; 5. The manufacturing process of the environment-friendly slipper according to claim 4, characterized in that, The second punching lower die seat (14) is provided with a limiting groove (141) corresponding to the sinking area (9), and the second punching upper die head (15) is provided with a first arc-shaped cutting groove (151) and a second arc-shaped cutting groove (152) corresponding to the front end and the rear end of the second punching lower die seat (14), respectively. A punching process is performed on the flip-flop to be cut using a third punching die, including:

6. The manufacturing process of the environment-friendly slipper according to claim 1, characterized in that, The flip-flop to be cut is positioned and placed on the third punching lower die seat (16) of the third punching die, and the third punching upper die head (17) of the third punching die is used to punch the flip-flop to be cut; The third punching lower die seat (16) is provided with a punching groove (161), the outer side of the punching groove (161) is provided with a plurality of limiting blocks (162), the bottom of the flip-flop to be cut is provided with an upwardly recessed limiting area, and the limiting area corresponds to the limiting blocks (162). The manufacturing raw materials are respectively made into a shoe upper semi-finished product (10) and a shoe sole semi-finished product (11), a sinking area (9) is formed on the top surface of the shoe upper semi-finished product (10), and a plurality of protrusions (3) protruding downward are formed on the shoe sole semi-finished product (11), the protrusions (3) forming a pit area (4) on the top surface of the shoe sole semi-finished product (11); 7. An environmentally friendly slipper, characterized by comprising: ​ A shoe sole (1) has a plurality of protrusions (3) protruding downward, the protrusions (3) form a concave area (4) on the top surface of the shoe sole (1), and the shoe sole (1) has sunken assembly areas (5) on both sides; A shoe upper (2) has assembly edges (6) connected with the sunken assembly areas (5); The protrusions (3) include support roots (31) and deformed tops (32), the support roots (31) are arranged close to the bottom surface of the shoe sole (1), and the deformed tops (32) collapse after being subjected to external force, and the collapsed deformed tops (32) form upwardly concave adsorption areas (33).

8. The eco-friendly slipper according to claim 7, wherein, The bottom surface of the shoe sole (1) is provided with support platforms (7), and the downward protruding height of the support platforms (7) is smaller than the downward protruding height of the uncollapsed protrusions (3).

9. The eco-friendly slipper according to claim 7, wherein the insole is made of a material having a water absorption rate of 10% or less. The top surface of the shoe sole (1) is provided with a contact isolation layer.

10. The eco-friendly slipper according to claim 7, wherein the insole is made of a material having a water absorption rate of 10% or less. The shoe upper (2) is a hard main body made of a paper pulp molding process, or the shoe upper (2) is a flexible main body made of plant fibers. When the shoe upper (2) is a hard main body, the top surface of the shoe upper (2) is provided with a sunken area (9), and the bottom surface of the sunken area (9) is in contact with the instep.

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