CN114193754A - Forming process of supercritical foaming environment-friendly shoe material with customized surface grains - Google Patents
Forming process of supercritical foaming environment-friendly shoe material with customized surface grains Download PDFInfo
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- CN114193754A CN114193754A CN202111214449.4A CN202111214449A CN114193754A CN 114193754 A CN114193754 A CN 114193754A CN 202111214449 A CN202111214449 A CN 202111214449A CN 114193754 A CN114193754 A CN 114193754A
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- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000005187 foaming Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 26
- 238000007731 hot pressing Methods 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 238000011282 treatment Methods 0.000 claims abstract description 14
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 239000000806 elastomer Substances 0.000 claims abstract description 12
- 238000007788 roughening Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000009740 moulding (composite fabrication) Methods 0.000 claims abstract description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920006346 thermoplastic polyester elastomer Polymers 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 210000001161 mammalian embryo Anatomy 0.000 claims description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 abstract description 12
- 241000482268 Zea mays subsp. mays Species 0.000 abstract description 12
- 239000000047 product Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 5
- 239000011265 semifinished product Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000013536 elastomeric material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/002—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C33/424—Moulding surfaces provided with means for marking or patterning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/021—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing of profiled articles, e.g. hollow or tubular articles, beams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C33/424—Moulding surfaces provided with means for marking or patterning
- B29C2033/426—Stampers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
- B29L2031/504—Soles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
The invention discloses a molding process of a supercritical foaming environment-friendly shoe material with customized surface grains, which comprises the following steps: firstly, preparing an uncrosslinked elastomer material into particles, and then putting the particles into a reaction kettle for supercritical foaming to obtain uncrosslinked foamed particles; forming the non-crosslinked foamed particles into a blank mold in a steam foaming forming mold; thirdly, the skin of the blank mold is subjected to roughening treatment; fourthly, placing the blank mold after the roughening treatment into a hot-pressing forming mold, after the hot-pressing forming mold is subjected to hot pressing for 150-200s, taking out the blank mold after the hot pressing, putting the blank mold into cold water for soaking and shaping, and forming a protective film with customized surface grains on the surface of the blank mold. The invention forms exquisite patterns on the outer surface of the environment-friendly shoe material, does not influence the wearing comfort of the whole shoe, and completely keeps the performance of the popcorn shoe material product.
Description
Technical Field
The invention relates to the field of supercritical foaming environment-friendly shoe materials, in particular to a molding process of a supercritical foaming environment-friendly shoe material with customized surface grains.
Background
In recent years, supercritical foaming materials and the technology thereof are exploded in the market, and especially supercritical foaming of elastomers has very wide application prospect in the field of sports shoes because of the advantages of high resilience, low density, good molding processability and the like.
At present, the forming process of the popcorn shoes sold in the market by the fire explosion generally comprises the following steps: firstly, granulating by a screw mechanism, then carrying out supercritical foaming on elastomer particles in a reaction kettle, and decompressing to obtain foamed particles; and secondly, putting the foamed particles into a steam forming device, and carrying out hot-press forming through high-pressure steam to obtain the sole sheet.
The sole sheet obtained by steam forming still retains better granular shapes, so the name of the 'popcorn' shoe is produced on the market; the 'popcorn' shoes are comfortable to wear and are very popular with consumers.
However, it has at least two disadvantages:
firstly, the method comprises the following steps: although the popcorn grains are melt-bonded together, they still inevitably have minute gaps, which are easily penetrated by dust, thereby causing a problem of difficulty in cleaning.
Secondly, the method comprises the following steps: the sheet obtained by steam forming is all in granular shape, the shape is relatively fixed, and the sales bright points are lacked; the market for such products has been spreading for six to seven years now, and consumers have experienced aesthetic fatigue, resulting in pure popcorn shapes that have gradually lost their advantage in terms of their aesthetic appeal.
Therefore, how to process the appearance of the popcorn shoe material and solve the problem of tiny gaps between adjacent particles at the same time is natural; to solve this problem, the applicant has previously conducted treatments by painting, drawing, etc., and has also filed patent applications with the national patent office, and has been working on this problem.
Chinese patent document CN109551703A discloses a method for forming a foamed sole, a mold thereof, and a sole structure thereof, which can generate detailed structural features on the surface of the foamed sole to produce a foamed sole with an identified three-dimensional pattern, which is used to show the specific pattern produced by the manufacturer, thereby facilitating the identification of related manufacturers or consumers.
The middle section processing is further divided into standing and polishing, wherein the standing refers to that the initially foamed semi-finished product foamed sole is placed for 7-9 hours at normal temperature to enable the size of the initially foamed semi-finished product foamed sole to be stable, and the polishing processes the surface of the semi-finished product foamed sole after standing to enable the surface to be roughened.
Although the above document discloses three steps for realizing the three-dimensional pattern recognition of the outer surface of the foamed sole, the following drawbacks still exist in the practical operation process:
firstly, the foaming particles are only suitable for being formed by chemical foaming (foaming agent), but cannot be directly applied to the foaming particles formed by physical foaming, especially cannot be directly applied to physical foaming which is not subjected to crosslinking operation, because general materials such as EVA, TPO, TPU or TPS materials are adopted, and the whole product can be directly shrunk in a high-temperature forming step under the condition of not being crosslinked, so that an apparent identification three-dimensional pattern cannot be formed; in addition, the chemical foaming by adding the foaming agent can make the shoe material have a taste, so that the whole product cannot be suitable for higher-end application requirements, and the application range of the product is limited;
secondly, because the product is obtained by corresponding to chemical foaming, high-temperature gas is adopted to enter a mold cavity in the step of high-temperature forming so as to promote the expansion of the semi-finished product foaming sole; then cooling water is adopted to enter the mold cavity through the fluid hole, so that the semi-finished product foamed sole shrinks; and then the step of closing the die by a high-temperature forming die for 80-120 seconds and compressing the semi-finished foamed sole repeatedly heats and cools the die cavity, so that a large amount of energy is wasted, the whole production efficiency is high all the time, the processing cost is high, and the market competitiveness is low.
Based on this, the applicant has diligently studied the above problems and made the present invention.
Disclosure of Invention
The invention mainly aims to provide a molding process of a supercritical foaming environment-friendly shoe material with customized surface grains, and the molding process is used for solving the problem that the surface grains cannot be customized under the conditions of supercritical foaming and no crosslinking in the prior art.
In order to achieve the above purpose, the solution of the invention is:
a molding process of a supercritical foaming environment-friendly shoe material with customized surface grains comprises the following steps:
firstly, preparing an uncrosslinked elastomer material into particles, and then putting the particles into a reaction kettle for supercritical foaming to obtain uncrosslinked foamed particles;
forming the non-crosslinked foamed particles into a blank mold in a steam foaming forming mold;
thirdly, the skin of the blank mold is subjected to roughening treatment;
fourthly, placing the blank mold after the roughening treatment into a hot-pressing forming mold, after the hot-pressing forming mold is subjected to hot pressing for 150-200s, taking out the blank mold after the hot pressing, putting the blank mold into cold water for soaking and shaping, and forming a protective film with customized surface grains on the surface of the blank mold.
Furthermore, the roughening treatment in the step III is to use a grinding wheel with 40-60 meshes of gauze to roughen the skin of the embryo mould by 0.8-1.2mm at the rotating speed of 3000 plus 5000 rpm.
Further, the uncrosslinked elastomeric material is selected from high temperature and shrinkage resistant materials having a softening point of 130 ℃ to 200 ℃.
Further, the uncrosslinked elastomeric material is a nylon material or a TPEE material.
After the method is adopted, the forming process can form delicate patterns on the outer surface of the environment-friendly shoe material, the wearing comfort of the whole shoe is not influenced, and the performance of the popcorn shoe material product is completely kept.
The shoe material formed by the invention is not only colorless and tasteless, but also has the characteristic of 100 percent recovery due to the fact that the shoe material is made of an uncrosslinked elastomer material.
The elastomer material of the invention should select the high temperature resistant and shrinkage resistant material with the softening point of 130-200 ℃, thus when the hot-pressing forming die carries out hot-pressing treatment on the blank mould, the elasticity of the blank mould can still be kept, and the whole product cannot be caused by direct shrinkage; under the condition of selecting such materials, a mode of combining rapid heating and rapid cooling is also needed, the traditional heating is generally more than 300s, but the invention adopts 150-200s, the heating time is shortened, and meanwhile, the mode of directly soaking in cold water (normal temperature) is adopted, so that the shaping efficiency is high, and the product quality is ensured.
In short, the invention relates to a molding process of a supercritical environment-friendly shoe material with customized surface texture, which actively investigates and absorbs a method for forming a three-dimensional identification pattern during traditional chemical foaming when the actual problems exist, belongs to upgrading and modification after reference, and further innovatively provides a solution for realizing the customized surface texture during physical foaming.
In the process of carrying out combined innovation, the invention combines the environmental protection strategy proposed by the current country, directly adopts the uncrosslinked material to manufacture the particles, and obtains the uncrosslinked foamed particles through physical foaming; however, when the non-crosslinked particles are used, the particles are easy to deform during secondary treatment (hot press molding), and aiming at the technical problem generated during the practical application, the inventor creatively thinks that a high temperature and shrinkage resistant material with the softening point of 130-200 ℃ is selected from a plurality of materials, and then the heating and molding operation is carried out by matching with the modes of rapid heating and rapid cooling of an upper mold, so that the product quality is ensured, and meanwhile, a protective film with customized surface grains is formed on the outer surface, and the specific pattern of the customized surface grains is determined by the patterns inside a hot press molding mold.
Drawings
FIG. 1 is a schematic view of an angle in a hot press forming process according to the present invention.
FIG. 2 is a schematic view of another angle of the hot press forming process of the present invention.
Figure 3 is a schematic representation of the profile of a prior art shaped popcorn pellet.
FIG. 4 is a schematic view of an embodiment of a customized surface texture obtained by the present invention.
Fig. 5 is an enlarged view of a portion a in fig. 4.
In the figure:
a hot press molding die 100; a lower die 1; an upper die 2; a cavity 3;
a blank mold 200; a popcorn contoured surface 210; the surface texture 220 is customized.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
The embodiment of the invention discloses a molding process of a supercritical foaming environment-friendly shoe material with customized surface grains, which comprises the following steps:
firstly, preparing an uncrosslinked elastomer material into particles, and then putting the particles into a reaction kettle for supercritical foaming to obtain uncrosslinked foamed particles;
forming the non-crosslinked foamed particles into a blank mold in a steam foaming forming mold;
thirdly, the skin of the blank mold is subjected to roughening treatment;
fourthly, placing the blank mold after the roughening treatment into a hot-pressing forming mold, after the hot-pressing forming mold is subjected to hot pressing for 150-200s, taking out the blank mold after the hot pressing, putting the blank mold into cold water for soaking and shaping, and forming a protective film with customized surface grains on the surface of the blank mold.
It should be noted that, in the actual processing, except for the selection of the elastomer material, the steps of (i) and (ii) are the same as the prior art operation of obtaining the blank mold by physical foaming, and the detailed description of the prior art technique is omitted here.
As shown in fig. 1 and 2, there is shown a schematic view of the entire hot press molding die 100, which is heated by hot oil, the entire hot press molding die 100 having a lower die 1 and an upper die 2, the upper die 2 and the lower die 1 having a cavity 3 formed therebetween for accommodating a blank mold 200; FIG. 1 shows a schematic view from the side of a sole; fig. 2 shows a schematic view from the rear side of the sole, in fig. 2 two blank molds are shown arranged side by side, which have been subjected to steam foaming.
Referring now to fig. 3-5, which show a schematic representation of a customized surface texture, fig. 3 is a conventional prior art popcorn shoe having a popcorn shaped surface 210, and fig. 4 and 5 show the development of the present invention that can form a variety of desired patterns on the surface, i.e., a customized surface texture 220, as indicated by the present invention.
In practical operation, the roughening treatment in the third step is to use a grinding wheel with 40-60 mesh gauze to roughen the surface of the blank mold by 0.8-1.2mm at 3000 plus 5000 rpm, so as to ensure the quality of the shoe material not to change and to better form the protective film in the next step.
The uncrosslinked elastomer material is selected from high temperature resistant and shrinkage resistant materials with the softening point of 130-200 ℃; as a preferred embodiment, the uncrosslinked elastomeric material is a nylon material or a TPEE material.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (4)
1. A molding process of a supercritical foaming environment-friendly shoe material with customized surface grains is characterized by comprising the following steps:
firstly, preparing an uncrosslinked elastomer material into particles, and then putting the particles into a reaction kettle for supercritical foaming to obtain uncrosslinked foamed particles;
forming the non-crosslinked foamed particles into a blank mold in a steam foaming forming mold;
thirdly, the skin of the blank mold is subjected to roughening treatment;
fourthly, placing the blank mold after the roughening treatment into a hot-pressing forming mold, after the hot-pressing forming mold is subjected to hot pressing for 150-200s, taking out the blank mold after the hot pressing, putting the blank mold into cold water for soaking and shaping, and forming a protective film with customized surface grains on the surface of the blank mold.
2. The forming process of the supercritical foaming environmental protection shoe material with customized surface texture as claimed in claim 1, wherein the roughening treatment in the step (c) is to use a grinding wheel with 40-60 mesh gauze to polish off the skin of the embryo mold with a thickness of 0.8-1.2mm at a rotation speed of 3000 plus 5000 rpm.
3. The process for forming a supercritical foaming eco-friendly shoe material with customized surface texture as claimed in claim 1, wherein the uncrosslinked elastomer material is selected from high temperature and shrinkage resistant materials with softening point of 130 ℃ to 200 ℃.
4. The process for forming a supercritical foaming eco-friendly shoe material with customized surface texture as claimed in claim 3, wherein the uncrosslinked elastomer material is nylon material or TPEE material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214449.4A CN114193754A (en) | 2021-10-19 | 2021-10-19 | Forming process of supercritical foaming environment-friendly shoe material with customized surface grains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214449.4A CN114193754A (en) | 2021-10-19 | 2021-10-19 | Forming process of supercritical foaming environment-friendly shoe material with customized surface grains |
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| Publication Number | Publication Date |
|---|---|
| CN114193754A true CN114193754A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111214449.4A Pending CN114193754A (en) | 2021-10-19 | 2021-10-19 | Forming process of supercritical foaming environment-friendly shoe material with customized surface grains |
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| Country | Link |
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| CN (1) | CN114193754A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202425688U (en) * | 2011-11-28 | 2012-09-12 | 青岛亨达股份有限公司 | Light antiskid shoes |
| CN108081652A (en) * | 2018-01-08 | 2018-05-29 | 晋江兴迅新材料科技有限公司 | A kind of preparation process of supercritical foaming sole |
| CN110948771A (en) * | 2019-11-22 | 2020-04-03 | 东莞市国昱鞋材有限公司 | Manufacturing method of supercritical foaming sole |
| CN111070539A (en) * | 2019-12-31 | 2020-04-28 | 晋江兴迅新材料科技有限公司 | Foaming and shaping process of environment-friendly thermoplastic elastomer |
| CN111098437A (en) * | 2019-12-17 | 2020-05-05 | 东莞兆阳兴业塑胶制品有限公司 | Supercritical foaming equipment and foaming process |
-
2021
- 2021-10-19 CN CN202111214449.4A patent/CN114193754A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202425688U (en) * | 2011-11-28 | 2012-09-12 | 青岛亨达股份有限公司 | Light antiskid shoes |
| CN108081652A (en) * | 2018-01-08 | 2018-05-29 | 晋江兴迅新材料科技有限公司 | A kind of preparation process of supercritical foaming sole |
| CN110948771A (en) * | 2019-11-22 | 2020-04-03 | 东莞市国昱鞋材有限公司 | Manufacturing method of supercritical foaming sole |
| CN111098437A (en) * | 2019-12-17 | 2020-05-05 | 东莞兆阳兴业塑胶制品有限公司 | Supercritical foaming equipment and foaming process |
| CN111070539A (en) * | 2019-12-31 | 2020-04-28 | 晋江兴迅新材料科技有限公司 | Foaming and shaping process of environment-friendly thermoplastic elastomer |
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