CN112662003A - Foamed shoe material and method for producing same - Google Patents
Foamed shoe material and method for producing same Download PDFInfo
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- CN112662003A CN112662003A CN201910975619.7A CN201910975619A CN112662003A CN 112662003 A CN112662003 A CN 112662003A CN 201910975619 A CN201910975619 A CN 201910975619A CN 112662003 A CN112662003 A CN 112662003A
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Abstract
A method for preparing foamed shoe material includes such steps as injecting the elastic thermoplastic material and supercritical fluid into the first mould, dissolving the supercritical fluid in the elastic thermoplastic material under the action of pressure and temp to obtain mixture, injecting the mixture into the second mould at 200mm/s flow speed, flowing the mixture along axial direction, and foaming under the action of pressure drop. Each foaming micropore is stretched along a central line direction, and the ratio of the maximum length along the central line direction to the maximum width vertical to the central line direction is 2: 1 or more. Therefore, by means of high-speed injection, the foaming shoe material disclosed by the invention can be quickly foamed and molded without adding a chemical foaming agent, and a large number of foaming micropores are formed, so that the requirement on environmental protection can be met, the processing time can be greatly shortened, and the integral density value can be reduced.
Description
Technical Field
The invention relates to a foaming shoe material, in particular to a foaming shoe material and a manufacturing method thereof.
Background
A method for manufacturing a low density foamed article as disclosed in taiwan patent No. I658076, mainly comprises mixing a molten thermoplastic polyurethane elastomer, a chemical blowing agent and a supercritical fluid into a mixture, and injecting the mixture into a mold through an extruder to form a low density foamed article having porous pores. However, patent No. I658076 aims at reducing the density to 0.3g/cm3The chemical foaming agent is used, so that the foamed and molded object cannot be recycled, the environment pollution is caused, and the environment-friendly requirement is not met.
Another method for forming a polymer foamed article, such as that disclosed in taiwan patent No. I389953, is to use a chemical blowing agent, and further to increase the number of cells by increasing the pressure to reduce the density. However, the patent No. I389953 also uses a chemical foaming agent to pollute the environment, and increases back pressure, which makes it difficult to rotate the screw of the injection machine and increases the cost of equipment.
Disclosure of Invention
The invention aims to provide a foaming shoe material which can meet the requirement of environmental protection, greatly shorten the processing time and reduce the integral density value and a manufacturing method thereof.
The invention relates to a foaming shoe material, which comprises a foaming body. The foaming body is formed by foaming a thermoplastic elastic material and a supercritical fluid and comprises a plurality of foaming micropores, each foaming micropore extends along the direction of a central line, and the ratio of the maximum length along the direction of the central line to the maximum width vertical to the direction of the central line is 2: 1 or more, the density of the foamed body is 0.35g/cm3The following.
The foamed shoe material of the present invention is characterized in that the thermoplastic elastic material is at least one of a polyolefin elastomer, a thermoplastic polyurethane elastomer, and a thermoplastic elastomer.
According to the foaming shoe material, the Shore hardness of the foaming body is 40-80 HSC.
According to the foaming shoe material, the resilience amount of the foaming body is 35-80%.
According to the foaming shoe material, the compression deformation of the foaming body is 10-50%.
The maximum length of each foaming micropore of the foaming shoe material is less than 6 mm.
According to the foaming shoe material, the foaming body is divided into a sole area, an arch area and a heel area along the axis direction, the central line of each foaming micropore and the axis form an included angle, and the included angle is 0-60 degrees.
The invention relates to a method for manufacturing a foaming shoe material, which comprises the following steps:
(A) a thermoplastic elastomer is injected into the first mold.
(B) And injecting a supercritical fluid into the first mold, so that the supercritical fluid is dissolved in the thermoplastic elastic material under the action of pressure and temperature to form a mixture.
(C) Injecting the mixture into a second mold at a flow velocity of 200mm/s or more, causing the mixture to flow in an axial direction, and starting foam molding under the action of a pressure drop, and forming a plurality of foam cells each stretched in a center line direction, with a ratio of a maximum length in the center line direction to a maximum width perpendicular to the center line direction being 2: 1 or more.
In the method for manufacturing the foamed shoe material of the present invention, the injection or extrusion of the mixture into the second mold is performed.
In the method for producing the foamed shoe material of the present invention, the thermoplastic elastic material is at least one of a polyolefin elastomer, a thermoplastic polyurethane elastomer, and a thermoplastic elastomer.
In the method for producing a foamed shoe material of the present invention, the flow rate of the mixture injected into the second mold is 250mm/s or more.
In the manufacturing method of the foaming shoe material, the second mould is provided with at least one porous mould core for exhausting.
The invention has the beneficial effects that: by means of high-speed injection, the foaming shoe material disclosed by the invention can be quickly foamed and molded without adding an additional chemical foaming agent, and a large number of foaming micropores are formed, so that the requirement on environmental protection can be met, the processing time can be greatly shortened, and the integral density value can be reduced.
Drawings
Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic sectional view of the foamed shoe material of the present invention.
Fig. 2 is a partially enlarged schematic view of fig. 1.
Fig. 3 is a schematic cross-sectional view of a first jig and a second jig.
FIG. 4 is a flow chart of the method for manufacturing the foamed shoe material of the present invention.
Fig. 5 is an enlarged cross-sectional view of the second mold in the initial injection state of fig. 3.
Detailed Description
Referring to fig. 1 and 2, an embodiment of the foamed shoe material of the present invention includes a foamed body 1.
The foaming body 1 is formed by foaming a thermoplastic elastic material 11 and a supercritical fluid, and is divided into a sole area 101, an arch area 102 and a heel area 103 along an axis X direction. The foamed body 1 includes a plurality of foamed cells 12. Each of the foam cells 12 extends along a center line L, which forms an angle θ with the axis X. The included angle theta is between 0 and 60 degrees. The ratio of the maximum length H of each foaming cell 12 in the direction of the center line L to the maximum width W of each foaming cell 12 perpendicular to the center line L is 2: 1 or more, and the maximum length H of each foaming micropore 12 is less than 6 mm. Thereby, each of the foaming cells 12 is formed in an elongated oval shape.
Referring to fig. 3, the foamed shoe material is manufactured and molded by a first mold 2 and a second mold 3. The first tool 2 is, for example, an injection molding machine or an extrusion molding machine, and includes a cylinder 21 and a screw 22. A chamber 20 is formed in the barrel 21. The screw 22 is displaceably inserted into the cylinder 21. The second mold 3 includes an upper mold 31 and a lower mold 32. A mold cavity 30 is formed between the upper mold 31 and the lower mold 32, and the pressure in the mold cavity 30 is normal pressure. The second mold 3 is formed with an injection hole 33, and the injection hole 33 is communicated with the mold cavity 30 and the cavity 20. In order to achieve the capability of rapid air exhaust and maintain the injection speed at more than 200mm/s, the upper mold 31 has a porous mold core 311, and the lower mold 32 has a porous mold core 321 for air exhaust.
Referring to fig. 2 to 5, the method for manufacturing the foamed shoe material includes the following steps:
step 41: 99.9-95% by weight of thermoplastic elastomer material 11 is injected into the chamber 20 of the first tool 2. The thermoplastic elastomer material 11 may be at least one of polyolefin elastomer (POE), thermoplastic polyurethane elastomer (TPU), or thermoplastic elastomer (TPE).
Step 42: injecting 0.1-5% by weight of a supercritical fluid into the chamber 20 of the first tool 2, such that the supercritical fluid is dissolved in the thermoplastic elastomer material 11 at an operating pressure greater than 0.5Mpa (73psi) and an operating temperature of 100-300 ℃ to form a mixture 1'.
The supercritical fluid may be nitrogen N2Or carbon dioxide CO2Or mixtures thereof. The principle, technique and working conditions of melting the thermoplastic elastomer material 11 and dissolving the supercritical fluid in the thermoplastic elastomer material 11 are disclosed in taiwan patent No. I658076, which is a prior art, but the technical features of this application and the details of the expansion can be derived by those skilled in the art from the above description, and therefore, the description is not repeated.
Step 43: the screw 22 is driven to extrude the mixture 1 'in the barrel 21 to flow towards the injection hole 33, so that the mixture 1' is injected into the mold cavity 30 of the second mold 3 through the injection hole 33 at a flow speed of 200mm/s or more, wherein the flow speed of 250mm/s or more is more effective. When the mixture 1' enters the mold cavity 30, it will flow rapidly along the axis X from the injection hole 33, and start to foam under the action of the pressure drop, and form the foaming cells 12.
Since the flow velocity at the time of injection is relatively high, the shear force is increased during the flow, and more tears are generated during the foaming and flow of the molten thermoplastic elastomer material 11, so that the number of nucleation of the foamed cells 12 is increased and the foamed cells are stretched into a long stripe shape along the flow direction. Therefore, the density of the foaming micropores 12 is improved through a large number of formed foaming micropores 12, and the density of the foaming body 1 is further reduced to 0.35g/cm3The following. And since the mixture 1' leaves the injection hole 33, the foaming pores 12 begin to grow larger, when the flow rate is higher than 200mm/s, the time difference between the filling time in the sole region 101 and the filling time in the heel region 103 is shortened, the foam size of the foaming pores 12 is maintained below 6mm, and large pores are not generated, thereby increasing the uniformity of the cells of the foaming body 1.
The measured data of the foam body 1 are shown in table 1.
TABLE 1
It should be noted that the foamed body 1 having different physical properties can be obtained by changing the weight percentages of the thermoplastic elastomer 11 and the supercritical fluid, the operating temperature and the operating pressure of the first mold 2, the operating temperature of the second mold 3, and the flow rate of the thermoplastic elastomer 11 at the time of injection. The Shore hardness (Shore C) of the foaming body 1 is 40-80 HSC, the rebound quantity is 35-80%, and the compression deformation quantity is 10-50%. Therefore, the foamed shoe material with higher elasticity and light weight is prepared.
From the above description, the advantages of the foregoing embodiments can be summarized as follows:
the invention adopts a high-speed injection mode to ensure that the foaming shoe material of the invention can be quickly foamed and molded without adding additional chemical foaming agent, and a large number of foaming micropores 12 are formed, thereby meeting the requirement of environmental protection, greatly shortening the processing time and reducing the integral density value to 0.35g/cm3The following.
The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.
Claims (12)
1. A foamed shoe material comprising:
the foaming body is formed by foaming a thermoplastic elastic material and a supercritical fluid and comprises a plurality of foaming micropores, and is characterized in that:
each foaming micropore extends along a central line direction, and the ratio of the maximum length along the central line direction to the maximum width vertical to the central line direction is 2: 1 or more, the density of the foamed body is 0.35g/cm3The following.
2. The foamed shoe material according to claim 1, characterized in that: the thermoplastic elastic material is at least one of polyolefin elastomer, thermoplastic polyurethane elastomer and thermoplastic elastomer.
3. The foamed shoe material according to claim 1, characterized in that: the Shore hardness of the foaming body is 40-80 HSC.
4. The foamed shoe material according to claim 1, characterized in that: the resilience of the foaming body is 35-80%.
5. The foamed shoe material according to claim 1, characterized in that: the compression deformation amount of the foaming body is 10-50%.
6. The foamed shoe material according to claim 1, characterized in that: the maximum length of each foaming micropore is less than 6 mm.
7. The foamed shoe material according to claim 1, characterized in that: the foaming body is divided into a sole area, an arch area and a heel area along the axis direction, the central line of each foaming micropore and the axis form an included angle, and the included angle is 0-60 degrees.
8. A manufacturing method of a foaming shoe material comprises the following steps:
(A) injecting a thermoplastic elastomer into a first mold;
(B) injecting a supercritical fluid into the first tool to dissolve the supercritical fluid in the thermoplastic elastomer under the action of pressure and temperature to form a mixture; and
(C) injecting the mixture into a second mold at a flow velocity of 200mm/s or more, causing the mixture to flow in an axial direction, and starting foam molding under the action of a pressure drop, and forming a plurality of foam cells each stretched in a center line direction, with a ratio of a maximum length in the center line direction to a maximum width perpendicular to the center line direction being 2: 1 or more.
9. The method for manufacturing a foamed shoe material according to claim 8, characterized in that: the way of injecting the mixture into the second tool is injection or extrusion.
10. The method for manufacturing a foamed shoe material according to claim 8, characterized in that: the thermoplastic elastic material is at least one of polyolefin elastomer, thermoplastic polyurethane elastomer and thermoplastic elastomer.
11. The method for manufacturing a foamed shoe material according to claim 8, characterized in that: the flow rate of the mixture injected into the second mold is 250mm/s or more.
12. The method for manufacturing a foamed shoe material according to claim 8, characterized in that: the second tool has at least one porous mold core for exhausting gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975619.7A CN112662003A (en) | 2019-10-15 | 2019-10-15 | Foamed shoe material and method for producing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975619.7A CN112662003A (en) | 2019-10-15 | 2019-10-15 | Foamed shoe material and method for producing same |
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| Publication Number | Publication Date |
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| CN112662003A true CN112662003A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910975619.7A Pending CN112662003A (en) | 2019-10-15 | 2019-10-15 | Foamed shoe material and method for producing same |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158986A (en) * | 1991-04-05 | 1992-10-27 | Massachusetts Institute Of Technology | Microcellular thermoplastic foamed with supercritical fluid |
| CN103600473A (en) * | 2013-11-27 | 2014-02-26 | 福州大学 | Forming device and forming method of microporous foam plastic |
| US20140252669A1 (en) * | 2013-03-05 | 2014-09-11 | Wisconsin Alumni Research Foundation | Method Of Fabricating An Injection Molded Component |
| CN105431269A (en) * | 2013-08-02 | 2016-03-23 | 耐克创新有限合伙公司 | Low density foam, midsole, footwear, and methods for making low density foam |
| CN105431268A (en) * | 2013-08-02 | 2016-03-23 | 耐克创新有限合伙公司 | Low density foamed articles and methods for making |
-
2019
- 2019-10-15 CN CN201910975619.7A patent/CN112662003A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5158986A (en) * | 1991-04-05 | 1992-10-27 | Massachusetts Institute Of Technology | Microcellular thermoplastic foamed with supercritical fluid |
| US20140252669A1 (en) * | 2013-03-05 | 2014-09-11 | Wisconsin Alumni Research Foundation | Method Of Fabricating An Injection Molded Component |
| CN105431269A (en) * | 2013-08-02 | 2016-03-23 | 耐克创新有限合伙公司 | Low density foam, midsole, footwear, and methods for making low density foam |
| CN105431268A (en) * | 2013-08-02 | 2016-03-23 | 耐克创新有限合伙公司 | Low density foamed articles and methods for making |
| CN103600473A (en) * | 2013-11-27 | 2014-02-26 | 福州大学 | Forming device and forming method of microporous foam plastic |
Non-Patent Citations (2)
| Title |
|---|
| 吴舜英: "《泡沫塑料成型》", 31 March 1992 * |
| 谷松涛: "微孔注塑发泡聚氨酯成型工艺及微观结构研究", 《工艺与设备》 * |
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Application publication date: 20210416 |