Production process of sandal sponge mat with three bevel edges of toe cap

Abstract

The invention discloses a production process of a sandal spongy cushion with three beveled edges of a toe cap, and relates to the technical field of spongy insoles, the production process comprises the following steps: step 1, preparing a spongy cushion, and carrying out hot press molding on sponges; the middle of the sponge mat is thicker than the periphery; step 2, compressing the density of the sponge to a certain degree to form an insole; 3, a sponge pad is glued and then pasted to the insole, and the pasted insole is polished, so that the front face of the insole has a certain corner angle; and 4, the polished insole and insole are subjected to whole leather packaging treatment. And step 5, attaching the vamp and the outsole to the wrapped insole by using Pu glue, and attaching the heel to prepare the finished women-heeled sandal. An inclined surface is directly formed when the sponge pad is subjected to hot press molding, and the edges and corners of the whole insole are more obvious after the sponge pad is polished, so that the shoe is exquisite; and when the sponge is subjected to hot pressing, the density of the sponge can be improved, so that the manufactured middle pad of the sandal has better rebound resilience and comfort.

Description

Technical Field

[0001] The invention specifically relates to the technical field of sponge insoles, in particular to a production process of a sandal sponge insole with three beveled edges on a toe. Background Art

[0002] The insole is the part of the shoe that directly contacts the sole of the foot, and it plays a key role in the overall performance of the shoe. When walking, running or doing other exercises, the foot will generate impact force on the ground. The sponge insole can effectively absorb and disperse this impact force, reduce the pressure on the foot, and protect the foot joints (such as ankles, knees, etc.) from excessive impact and injury. For example, during running or walking, the impact force generated when each step lands can be greatly reduced through the cushioning of the sponge insole, which can greatly reduce the impact force transmitted to the foot and body, allowing people to still feel relatively comfortable after walking for a long time, reducing fatigue and the risk of injury. Existing sponge pads have a low density, poor resilience, and low comfort; and the thickness of the sponge pads is the same around and in the middle, making the manufactured insoles appear very bulky and lack the delicate feeling of edges and corners. Summary of the invention

[0003] The purpose of the present invention is to provide a production process for a sandal sponge pad with three beveled edges on the toe, which can directly form a bevel when the sponge pad is hot-pressed, and after polishing, the edges and corners of the entire insole are more obvious, thereby improving the exquisite effect of the shoe; and when the sponge is hot-pressed, the density of the sponge can be increased, so that the manufactured insole has better resilience and comfort, so as to solve the technical problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A production process for a sandal sponge pad having three beveled edges on a toe, comprising the following steps:

[0006] Step 1, preparation of a sponge pad (1), cutting the sponge to a fixed length, and then placing the sponge into a hot pressing molding machine for cutting and hot pressing molding; the hot pressing molding temperature is between 100° C. and 200° C.; the hot pressing mold is heated for 8 to 10 minutes; the thickness of the sponge pad in the middle is greater than the thickness around it;

[0007] Step 2, compressing the density of the sponge to a certain degree to form an insole;

[0008] Step 3, apply glue to the sponge pad and stick it to the midsole;

[0009] Step 4, polishing the pasted insole to make it have certain edges and corners;

[0010] Step 5: Package the polished insoles and midsoles into leather.

[0011] As a further technical solution of the present invention, in step 1, the sponge is any one of EVA sponge, PU sponge, etc. and EVA sponge; the parameters of the sponge hot pressing molding are 100kgf / cm 2 -400kgf / cm 2 between.

[0012] As a further technical solution of the present invention, the heating time of the sponge hot pressing molding is between 5 seconds and 15 seconds; the holding time is generally between 3 seconds and 10 seconds; and the cooling time is generally between 10 seconds and 30 seconds.

[0013] As a further technical solution of the present invention, the sponge pad (1) is thick in the middle and thin around the edges, and has three inclined surfaces (2) at the front end, and the angle between the inclined surfaces (2) and the front end surface is 60 degrees.

[0014] As a further technical solution of the present invention, the density of the sponge insole after the hot pressing process is approximately 0.15g / cm 3 -0.6g / cm 3 As a further technical solution of the present invention, in step 4, when the insole is polished after bonding, a 60-100 mesh sandpaper grinding wheel can be used to quickly grind it off so that the insole has a 60-degree inclined surface; the hardness of the sandpaper grinding wheel is between 20-40.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides a sponge pad preparation method, wherein the sponge is cut to a fixed length, and then the sponge is placed in a hot pressing molding machine for cutting and hot pressing molding; the hot pressing molding temperature is between 100°C and 200°C; the hot pressing machine mold is heated for 8-10 minutes; the thickness of the sponge pad in the middle is greater than the thickness around it; the density of the sponge is compressed to a certain degree to form an insole; the sponge pad is glued and pasted to the midsole, and the pasted insole is polished so that the insole has certain edges and corners; the polished midsole and insole are packaged with leather; an inclined surface can be directly formed when the sponge pad is hot pressed, and after polishing, the edges and corners of the entire insole are more obvious, thereby improving the exquisite effect of the shoe; and when the sponge is hot pressed, the density of the sponge can be increased, so that the manufactured insole has better resilience and comfort; the sponge pad is thick in the middle and thin around, so that the insole midsole processed in this way is easy to be packaged with leather, and the aesthetic feeling of the appearance of the shoe is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the sponge pad in the present invention.

[0018] Figure 2 The present invention Figure 1 Schematic diagram of the bottom structure.

[0019] In the figure: sponge pad 1 inclined surface 2. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-2 In an embodiment of the present invention, a production process of a sandal sponge pad having three beveled edges on the toe, comprises the following steps:

[0022] Step 1, preparation of sponge pad 1, cutting the sponge to a fixed length, and then putting the sponge into a hot pressing molding machine for cutting and hot pressing molding; the temperature of hot pressing molding is between 100°C and 200°C; the hot pressing mold is heated for 8-10 minutes; the thickness of the sponge pad 1 in the middle is greater than the thickness around it;

[0023] Step 2, compressing the density of the sponge to a certain degree to form an insole;

[0024] Step 3, apply glue to the sponge pad and stick it to the midsole;

[0025] Step 4, polishing the pasted insole to make it have certain edges and corners;

[0026] Step 5: Package the polished insoles and midsoles into leather.

[0027] In this embodiment, in step 1, the sponge is any one of EVA sponge, PU sponge, etc. and EVA sponge; the parameters of the sponge hot pressing molding are 100kgf / cm 2 -400kgf / cm 2 Furthermore, the pressure of hot pressing of thinner sponge insoles can be relatively small, between 100kgf / cm 2 -200kgf / cm 2 Thicker or harder insoles require greater pressure, such as 300kgf / cm 2 -400kgf / cm 2 to ensure that the insole can be fully compacted to achieve the required thickness and density.

[0028] To be more specific, the pressure varies according to the material, thickness and size of the insole, usually around 100kgf / cm 2 -400kgf / cm 2 between.

[0029] For example, the pressure of hot pressing of thin sponge insoles can be relatively small, about 100kgf / cm 2 -200kgf / cm 2 Thicker or harder insoles require greater pressure, such as 300kgf / cm 2 -400kgf / cm 2 To ensure that the insole can be fully compacted to achieve the required thickness and density. In this embodiment, the heating time of the sponge hot pressing molding is between 5 seconds and 15 seconds; the pressure holding time is generally between 3 seconds and 10 seconds; and the cooling time is generally between 10 seconds and 30 seconds.

[0030] Furthermore, the heating time is usually between 5 seconds and 15 seconds, and the specific time depends on factors such as the material and thickness of the sponge insole and the hot pressing temperature.

[0031] For example, for EVA sponge insoles with a thickness of 3mm-5mm, the heating time is generally 8 seconds to 12 seconds at a hot pressing temperature of about 150°C; for thicker insoles, the heating time needs to be appropriately extended to ensure that the inside of the insole can also be fully softened by the heat; the holding time is generally between 3 seconds and 10 seconds, the purpose is to keep the insole in a certain shape under pressure until it cools and sets. For example, for some insoles that require higher shaping accuracy, the holding time may be set at 8 seconds to 10 seconds to ensure that the insole will not deform during the cooling process; the cooling time is generally between 10 seconds and 30 seconds, and the specific time depends on factors such as the material, thickness and cooling method of the insole. The natural cooling time is relatively long, while the use of auxiliary cooling methods such as water cooling or air cooling can greatly shorten the cooling time and improve production efficiency.

[0032] Furthermore, the specific time depends on factors such as the material, thickness and hot pressing temperature of the sponge insole. For example, for an EVA sponge insole with a thickness of 3mm-5mm, the heating time is generally 8 seconds to 12 seconds at a hot pressing temperature of about 150°C; for thicker insoles, the heating time needs to be appropriately extended to ensure that the inside of the insole can also be fully heated and softened.

[0033] In this embodiment, the sponge pad 1 is thick in the middle and thin at the periphery, and has three inclined surfaces 2 at the front end, and the angle between the inclined surface 2 and the front end surface is 60 degrees. By adopting the above technical solution, the inclined surface can be directly formed when the sponge pad is hot-pressed, and after polishing, the edges and corners of the entire insole are more obvious, thereby improving the exquisite effect of the shoe; and when the sponge is hot-pressed, the density of the sponge can be increased, so that the manufactured insole has better resilience and comfort; the sponge pad is thick in the middle and thin at the periphery, so the insole processed in this way is easier to be processed as a whole package of leather, and greatly improves the aesthetic appearance of the shoe.

[0034] In this embodiment, when applying glue to the sponge in step 2, the glue used is neoprene glue.

[0035] After application, it can quickly generate a certain degree of stickiness, which is convenient for positioning and adjusting the material during the pasting process, so that the various layers of the sandals can be quickly and initially fixed when they are pasted, reducing the situation of loose adhesion caused by material displacement.

[0036] Neoprene glue can withstand environmental tests for a certain period of time. Even if the sandals are exposed to sunlight, air, and friction caused by daily wear for a long time, the adhesive parts are not prone to debonding, aging, or becoming brittle, thus ensuring the service life of the sandals.

[0037] In this embodiment, the density of the sponge insole after the hot pressing process is approximately 0.15 g / cm 3 -0.6g / cm 3 .

[0038] Specifically, in general, in this embodiment, the density of the sponge insole after the hot pressing process is approximately 0.15 g / cm 3 -0.6g / cm 3 .

[0039] To be more specific, generally speaking, the density of the sponge insole after hot pressing is about 0.15g / cm 3 -0.6g / cm 3 between.

[0040] Low density (0.15g / cm 3 -0.3g / cm 3 For example, some insoles for daily casual shoes and sandals, which do not require high insole support, are usually made of low-density sponge hot-pressed. This type of insole is relatively soft, feels comfortable when worn, and can provide a certain cushioning effect, but may not provide enough support for the foot when walking for a long time or doing strenuous exercise.

[0041] For example, the density of sponge insoles for some common lightweight canvas shoes may be around 0.2g / cm 3 Around, it can make your feet feel more relaxed and comfortable in daily wear.

[0042] Medium density (0.3g / cm 3 -0.45g / cm 3 Left and right): mostly used in sports shoes, skateboard shoes, etc., taking into account both comfort and certain support performance.

[0043] During exercise, it can not only absorb the impact force from the ground and play a cushioning and protective role for the feet, but also provide appropriate support for the feet to prevent excessive deformation.

[0044] For example, the density of ordinary running shoe insoles after heat pressing is often in this range, which can meet the basic needs of people's daily exercise. 3 -0.6g / cm 3 Left and right): often found in the insoles of some professional sports shoes (such as basketball shoes, football shoes) or work shoes that require long periods of standing work. High-density sponge insoles can provide strong support. In complex sports such as high impact and frequent twisting, they can effectively protect the foot joints, maintain the stable shape of the foot, and reduce the risk of injury.

[0045] Like professional basketball shoe insoles, the density can reach 0.5g / cm 3 Even higher, to meet the strict requirements of foot support and cushioning in basketball sports such as frequent take-off, landing, and change of direction. Further details on the hot pressing density of the sponge pad: Due to the different types of sponges, different types of sponges have different initial densities, such as EVA sponge, PU sponge, etc.

[0046] EVA sponge is relatively hard, its initial density may be slightly higher, and the density change after hot pressing will also be different based on its own characteristics; PU sponge is relatively soft, and under the same hot pressing conditions, the final density will be different from that of EVA sponge.

[0047] For example, using the same hot pressing pressure, temperature and time parameters, the density of EVA sponge insoles after hot pressing may be 0.05g / cm higher than that of PU sponge insoles. 3 -0.15g / cm 3 (Specifics vary depending on other parameter settings).

[0048] Initial density of sponge: If the initial density of the selected sponge is low, the density will increase accordingly during the hot pressing process after compression, molding and other steps, but the increase is limited. The final hot pressing density still depends on factors such as the hot pressing process parameters and the compressibility of the raw materials. On the contrary, the density of the sponge with a higher initial density will change relatively less after hot pressing, but the overall density still varies within the above-mentioned common density range.

[0049] Hot pressing process parameters Pressure: The greater the pressure, the more the sponge insole is compressed during the hot pressing process and the higher the density.

[0050] For example, when the hot press pressure is increased from 200kgf / cm 2 Increased to 400kgf / cm 2 For the same sponge insole, the density after hot pressing may increase by 0.1g / cm 3 -0.2g / cm 3 About (the specific range of change will be different for different materials).

[0051] Temperature: The appropriate temperature can soften the sponge better, which is conducive to molding and changing the density under pressure. If the temperature is too low, the sponge will not soften enough and may not be fully compressed, resulting in a density that does not meet expectations; if the temperature is too high, it may affect the material properties of the sponge itself. However, generally within a reasonable hot pressing temperature range, increasing the temperature can help increase the density of the insole to a certain extent. For example, increasing the hot pressing temperature from 120°C to 150°C will increase the density of some sponge insoles to a certain extent, about 0.05g / cm 3 -0.1g / cm 3 About (depending on material and other conditions).

[0052] Time length: Heating time and holding time also affect density. Sufficient heating time can ensure that the sponge is fully softened, and a long holding time can keep the sponge under pressure longer, so that it can be better shaped and fixed, thereby increasing density. For example, if the holding time is extended from 5 seconds to 10 seconds, the density of the insole will increase accordingly, but the specific increase is closely related to the sponge material and other hot pressing parameters.

[0053] As a further description of the above embodiment: Sponge insole material:

[0054] Sponges of different materials have different thermal properties, and their suitable hot pressing temperature ranges vary greatly. For example, EVA (ethylene-vinyl acetate copolymer) sponge, due to its molecular structure and material properties, is generally suitable for hot pressing at a temperature between 120°C and 150°C. This temperature range can soften the EVA sponge to a suitable degree, making it easy to form and maintain good material properties; while PU (polyurethane) sponge usually requires a higher temperature, around 150°C-180°C, because the molecular chain structure of PU sponge is relatively more stable, and a higher temperature is required to soften effectively and achieve a good hot pressing effect.

[0055] In addition, even for sponges of the same material, if different additives are added to the formula or the degree of polymerization is different, the appropriate hot pressing temperature will also change. For example, for EVA sponges with added plasticizers, the hot pressing temperature can be appropriately reduced by about 5℃-10℃, because plasticizers can reduce the hardness and softening temperature of the material.

[0056] In this embodiment, in step 4, when polishing the insole after bonding, when polishing sponge insoles of different thicknesses and densities, the rotation speed should also be adjusted accordingly. For example, when polishing thinner sponge insoles, the rotation speed should be controlled at a lower level to prevent the insole from being damaged due to factors such as centrifugal force generated by high-speed rotation.

[0057] The working principle of the present invention is as follows: a sponge pad 1 is prepared, the sponge is cut to a fixed length, and then the sponge is put into a hot pressing molding machine for cutting and hot pressing molding; the temperature of hot pressing molding is between 100°C and 200°C; the heating time of the hot pressing machine mold is 8-10 minutes; the thickness of the sponge pad 1 in the middle is greater than the thickness of the surrounding area; the density of the sponge is compressed to a certain degree to form an insole; the sponge pad is glued and pasted on the midsole, and the pasted insole is polished so that the insole has certain edges and corners; the polished insole and midsole are wrapped with leather; when the sponge pad is hot pressed, an inclined surface can be directly formed, and after polishing, the edges and corners of the entire insole are more obvious, thereby improving the exquisite effect of the shoe; and when the sponge is hot pressed, the density of the sponge can be increased, so that the manufactured insole has better resilience and comfort; the sponge pad is thick in the middle and thin around, so it is easier to wrap the insole and midsole with leather, and the appearance of the shoe is greatly improved.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0059] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Technicians with this skill should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A production process for a sandal sponge pad with three beveled edges on the toe, characterized in that: The following steps are involved: Step 1, preparation of a sponge pad (1), cutting the sponge to a fixed length, and then placing the sponge into a hot pressing molding machine for cutting and hot pressing molding; the hot pressing molding temperature is between 100° C. and 200° C.; the hot pressing mold is heated for 8 to 10 minutes; the thickness of the sponge pad (1) in the middle is greater than the thickness around it; Step 2, compressing the density of the sponge to a certain degree to form an insole; Step 3, apply glue to the sponge pad and stick it to the midsole; Step 4, polishing the pasted insole to make it have certain edges and corners; Step 5: After polishing, the insole and midsole are packaged in leather.

2. The production process of the sandal sponge pad with three beveled edges on the toe according to claim 1, characterized in that: In the step 1, the sponge is any one of EVA sponge, PU sponge and EVA sponge; the sponge hot pressing molding parameter is 100kgf / cm 2 -400kgf / cm 2 between.

3. The production process of the sandal sponge pad with three beveled edges on the toe according to claim 2, characterized in that: The heating time for sponge hot pressing molding is between 5 seconds and 15 seconds; the holding time is generally between 3 seconds and 10 seconds; and the cooling time is generally between 10 seconds and 30 seconds.

4. The production process of the sandal sponge pad with three beveled edges on the toe according to claim 1, characterized in that: The sponge pad (1) is thick in the middle and thin at the periphery, and has three inclined surfaces (2) at the front end, wherein the angle between the inclined surfaces and the front end surface is 60 degrees.

5. The production process of the sandal sponge pad with three beveled edges on the toe of claim 4, characterized in that: The density of the sponge insole after hot pressing is 0.15g / cm 3 -0.6g / cm 3 .

6. The production process of the sandal sponge pad with three beveled edges on the toe according to claim 1, characterized in that: In the step 4, when the insole is polished after bonding, a 60-100 mesh sandpaper grinding wheel can be used to quickly grind it off so that the insole has a 60-degree inclined surface.

Images