CN113068898A - Thermoplastic polyurethane foamed sole with injection stripe lines and preparation process thereof - Google Patents
Thermoplastic polyurethane foamed sole with injection stripe lines and preparation process thereof Download PDFInfo
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- CN113068898A CN113068898A CN202010009466.3A CN202010009466A CN113068898A CN 113068898 A CN113068898 A CN 113068898A CN 202010009466 A CN202010009466 A CN 202010009466A CN 113068898 A CN113068898 A CN 113068898A
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/02—Soles; Sole-and-heel integral units characterised by the material
- A43B13/04—Plastics, rubber or vulcanised fibre
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/187—Resiliency achieved by the features of the material, e.g. foam, non liquid materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
- B29D35/122—Soles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
- B29D35/128—Moulds or apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
The invention relates to the technical field of manufacturing of foamed soles, in particular to a thermoplastic polyurethane foamed sole with injection strip lines and a preparation process thereof. The thermoplastic polyurethane foaming sole with the injection stripe lines is prepared by fully mixing thermoplastic polyurethane and a gas foaming agent in a ratio range of 1: 25-200 under the matching of a double screw and a single screw to form a TPU polymer foaming substance, injecting the TPU polymer foaming substance into a mold through extrusion and injection, and performing hot pressing, mold closing and shaping, wherein the injection stripe lines with the width of 1-60 mm are uniformly distributed on the foaming sole, and deep isolation stripe lines are arranged among the extrusion injection stripe lines. The gain effect of the phases of the invention is: the thermoplastic polyurethane foamed sole produced by the invention has unique extrusion injection stripe textures and isolation stripe stripes, has bright individuality and style, good elastic effect, good rebound effect, good wear-resisting effect, long service life and environmental protection.
Description
Technical Field
The invention relates to the technical field of manufacturing of foamed soles, in particular to a thermoplastic polyurethane foamed sole with injection strip lines and a preparation process thereof.
Background
The shoes are indispensable articles in daily life of people, and along with the development of society and the acceleration of life rhythm, people pay more and more attention to the comfortableness and the individuality of the shoes. The shoe soles are used as important components of shoes, the existing shoe soles are manufactured by adopting a one-step forming process, the produced shoe soles are pure color shoe soles, the color is single, the appearance style is monotonous, individuation cannot be highlighted, some shoe soles with pattern textures can be attached and generated only by subsequent secondary processing, not only processing procedures are added, but also additional new machines are needed for auxiliary production, the manufacturing and production cost of enterprises is greatly increased, the processing efficiency is low, the grains on the secondary processing are easy to wear and drop in the wearing process, the softness and the resilience coefficient of the shoe soles are directly related to the wearing comfort and the protection degree of the shoes, the traditional solid shoe soles are gradually replaced by newly-developed foamed shoe soles, the PU foamed shoe soles are mainly used, but the PU foamed shoe sole material has high processing process requirements, unable recycle of environmental protection not, PU foaming sole is inside easy bubble that produces in the manufacturing process, influences the quality of sole, also deforms easily under microthermal environment, the shortcoming of sclerosis, and sole wearing and tearing are fast, lead to its life weak point, and the comfort level of wearing is poor.
Disclosure of Invention
The invention aims to provide a thermoplastic polyurethane foamed sole with unique injection stripe lines, good resilience coefficient, long service life and environment-friendly and recyclable property, and is not easy to deform and harden in a low-temperature environment, and a preparation process thereof to solve the defects of the existing sole preparation technology.
The invention is realized by the following scheme:
the thermoplastic polyurethane foaming sole with the injection stripe lines is prepared by fully mixing thermoplastic polyurethane and a gas foaming agent in a ratio range of 1: 25-200 under the matching of a double screw and a single screw to form a TPU polymer foaming substance, injecting the TPU polymer foaming substance into a mold through extrusion and injection, and performing hot pressing, mold closing and shaping, wherein the injection stripe lines with the width of 1-60 mm are uniformly distributed on the foaming sole, and deep isolation stripe lines are arranged among the extrusion injection stripe lines.
A preparation process of a thermoplastic polyurethane foamed sole with injection strip lines comprises the following steps:
s1: adding a gas foaming agent and thermoplastic polyurethane according to the content of the gas foaming agent in the thermoplastic polyurethane, wherein the proportion range of the gas foaming agent and the thermoplastic polyurethane is 1: 25-200, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder barrel and the molten thermoplastic polyurethane by a double-screw extruder to form a mixture of a polymer-gas homogeneous system under the condition that the pressure value of the gas foaming agent injected into the extruder barrel is 1-8 kpa;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: injecting the prepared thermoplastic polyurethane polymer foam body by using a special-shaped intercepting type porous injection nozzle through an injection process, injecting the foam strip into a female die below the injection nozzle in a foaming strip mode, enabling the female die to move forwards, backwards, leftwards and rightwards at a constant speed until the female die is stacked and filled, and carrying out the injection process by adopting an injection cylinder with the storage pressure of 10-150 Kpa, the injection speed of 10-150 cm, the melt temperature value of the thermoplastic polyurethane polymer foam body of 140-220 ℃ and the injection time of 1-6 s;
s5: after the thermoplastic polyurethane polymer foaming strip is injected to fill the inner cavity of the female die, the female die moves back to a preset original point position, and is subjected to hot press molding with a fixedly arranged male die in an automatic up-down die closing mode, the male die and the female die are provided with vent holes, the diameter of each vent hole is 0.5-30 mm, the number of the vent holes is 1-400, when the dies are closed, the vacuum pumping and the exhaust work are required, the setting temperature is controlled to be 50-90 ℃, and the setting time is 5-15 min;
s6: and opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection stripe lines.
Further, the gas foaming agent comprises carbon dioxide, nitrogen, butane, isobutane, fluorine-containing gas, methanol, ethanol and dimethyl ether.
Furthermore, the double-screw extruder is mainly responsible for heating and melting raw materials and uniformly mixing the raw materials with foaming gas, and the single screw is mainly responsible for conveying and cooling the polyurethane gas mixture to form a thermoplastic polyurethane gas foaming material in a molten state.
Furthermore, the male die is positioned on a turntable for fixing the disc machine, the female die is attached to the disc machine, the female die is automatically taken on a platform with an SYZ axis and positioned by a manipulator, the servo motor controls the moving speed and the positioning of the female die on the platform with the SYZ axis, after foaming strips are stacked and filled in the inner cavity of the female die, the female die is driven by the manipulator to return to the original disc machine position, and the male die and the female die are automatically closed to perform hot pressing and shape combination.
Further, the set temperature of the male die is 60-90 ℃, the set temperature of the female die is 30-70 ℃, and the setting treatment time is 5-15 min.
Further, the area of the nozzle holes of the special-shaped intercepting type multi-hole nozzle is changed from 3mm to 80mm, and the distribution quantity of the nozzle holes is 1 to 200.
Compared with the prior art, the gain effect of the invention is as follows:
1. the thermoplastic polyurethane foamed sole produced by the invention has unique extrusion injection stripe textures and isolation stripe stripes, has bright personality and style, is pollution-free and peculiar-smell-free, does not generate pungent smell, and can play a role in deodorization when being worn;
2. the foamed sole manufactured by the preparation process disclosed by the invention is not easy to generate bubbles, has a good elastic effect, is not easy to deform, has a good rebound effect, can be well restored to the original shape after being turned and twisted, is not easy to deform and harden in a low-temperature environment, has a good wear-resistant effect, is not easy to damage, has a long service life, is environment-friendly and can be recycled;
3. the invention simplifies the processing technology, has less processing procedures, is easy to operate and process, has low defective product rate of products and is convenient for subsequent post-finishing adhesion;
4. the manufacturing method of the invention saves energy, protects environment, saves human resources and effectively reduces production cost;
5. the sole prepared by the invention has good shock absorption and buffering effects, light weight and soft foot touch, can be better attached to the sole, does not have the feeling of hurting feet, is comfortable to walk and high in wearing comfort level, and can replace the traditional filling type air cushion to play a better shock absorption role.
Drawings
FIG. 1 is a schematic view of the preparation process of the present invention.
Fig. 2 is a schematic diagram of the product of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The thermoplastic polyurethane foaming sole with the injection stripe lines is prepared by fully mixing thermoplastic polyurethane and a gas foaming agent in a ratio range of 1: 25-200 under the matching of a double screw and a single screw to form a TPU polymer foaming substance, injecting the TPU polymer foaming substance into a mold through extrusion and injection, and performing hot pressing, mold closing and shaping, wherein the injection stripe lines with the width of 1-60 mm are uniformly distributed on the foaming sole, and deep isolation stripe lines are arranged among the extrusion injection stripe lines.
A preparation process of a thermoplastic polyurethane foamed sole with injection strip lines comprises the following steps:
s1: adding a gas foaming agent and thermoplastic polyurethane according to the content of the gas foaming agent in the thermoplastic polyurethane, wherein the proportion range of the gas foaming agent and the thermoplastic polyurethane is 1: 25-200, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder barrel and the molten thermoplastic polyurethane by a double-screw extruder to form a mixture of a polymer-gas homogeneous system under the condition that the pressure value of the gas foaming agent injected into the extruder barrel is 1-8 kpa;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: injecting the prepared thermoplastic polyurethane polymer foam body by using a special-shaped intercepting type porous injection nozzle through an injection process, injecting the foam strip into a female die below the injection nozzle in a foaming strip mode, enabling the female die to move forwards, backwards, leftwards and rightwards at a constant speed until the female die is stacked and filled, and carrying out the injection process by adopting an injection cylinder with the storage pressure of 10-150 Kpa, the injection speed of 10-150 cm, the melt temperature value of the thermoplastic polyurethane polymer foam body of 140-220 ℃ and the injection time of 1-6 s;
s5: after the thermoplastic polyurethane polymer foaming strip is injected to fill the inner cavity of the female die, the female die moves back to a preset original point position, and meanwhile, the female die and a fixedly arranged male die are subjected to hot press forming in an automatic up-down die closing mode, in the hot press forming process, the male die and the female die are provided with vent holes, the diameter of each vent hole is 0.5-30 mm, when the dies are closed, the vacuum pumping and exhaust functions are needed, so that air in a foaming material can be exhausted when the foaming material is shaped in a shoe die, the problem of bubbles in the formed sole is solved, the shaping temperature is controlled at 50-90 ℃, and the shaping time is 5-15 min;
s6: and opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection stripe lines.
Further, the gas foaming agent comprises carbon dioxide, nitrogen, butane, isobutane, fluorine-containing gas, methanol, ethanol and dimethyl ether.
Furthermore, the double-screw extruder is mainly responsible for heating and melting raw materials and uniformly mixing the raw materials with foaming gas, and the single screw is mainly responsible for conveying and cooling the polyurethane gas mixture to form a thermoplastic polyurethane gas foaming material in a molten state.
Furthermore, the male die is positioned on a turntable for fixing the disc machine, the female die is attached to the disc machine, the female die is automatically taken on a platform with an SYZ axis and positioned by a manipulator, the servo motor controls the moving speed and the positioning of the female die on the platform with the SYZ axis, after foaming strips are stacked and filled in the inner cavity of the female die, the female die is driven by the manipulator to return to the original disc machine position, and the male die and the female die are automatically closed to perform hot pressing and shape combination.
Furthermore, the set temperature of the male die is 60-90 ℃, the temperature of the female die is 30-70 ℃, the male die and the female die are provided with vent holes, the diameter of each vent hole is 0.5-30 mm, the number of the vent holes is 1-400, when the dies are closed, the die has the functions of vacuumizing and exhausting, and the setting treatment time is 5-15 min.
Further, the diameter of the nozzle holes of the special-shaped shutoff type porous nozzle has the distribution quantity of the nozzle holes of 1-200 from the area of 3-80 mm.
Example 1:
a preparation process of a thermoplastic polyurethane foamed sole with injection strip lines comprises the following steps:
s1: adding a gas foaming agent into the thermoplastic polyurethane according to the content of the gas foaming agent, wherein the proportion range of the gas foaming agent to the thermoplastic polyurethane is 1:40, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder cylinder with the molten thermoplastic polyurethane by a double-screw extruder under the condition that the pressure value of the gas foaming agent injected into the extruder cylinder is 8kpa to form a mixture of a polymer-gas homogeneous system;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: the prepared thermoplastic polyurethane polymer foaming body is ejected by a special-shaped intercepting type porous nozzle with a nozzle hole area of 4mm for an injection process, the prepared thermoplastic polyurethane polymer foaming body is injected into a female die below the prepared thermoplastic polyurethane polymer foaming body in a foaming strip mode, the temperature of the female die is set to be 70 ℃, the female die can move forwards, backwards, leftwards and rightwards at a constant speed until the female die is stacked and filled, the injection process adopts an injection cylinder storage pressure of 50Kpa, an injection pressure of 80pa, an injection speed of 30cm and a thermoplastic polyurethane polymer foaming body melt temperature value of 168 ℃, and the injection time is 2 s;
s5: after the thermoplastic polyurethane polymer foaming strip is injected to fill the inner cavity of the female die, the female die moves back to a preset original point position, and meanwhile, the female die and a fixedly arranged male die are subjected to hot press forming in an automatic up-and-down die closing mode, the hole opening diameters of the male and female die exhaust holes are 0.8mm and 6mm respectively, the number of the male die exhaust holes is 60, the number of the female die exhaust holes is 30, the setting temperature is controlled at 90 ℃, and the setting time is 10 min;
s6: and opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection stripe lines.
The TPU polymer foaming body formed by mixing the gas foaming agent and the molten thermoplastic polyurethane rubber in a ratio of 1:40 is injected into a mold through a nozzle hole with the diameter of 4mm for shaping, the detection density of the produced thermoplastic polyurethane shoe insole is 0.25-0.35 g/cm for thin and thick cultivation, the rebound rate is 62-75%, the hardness value is 40-60C, the grains of the sole are densely distributed, and no bubble hole exists in the sole.
Example 2:
a preparation process of a thermoplastic polyurethane foamed sole with injection strip lines comprises the following steps:
s1: adding a gas foaming agent and thermoplastic polyurethane according to the content of the gas foaming agent in the thermoplastic polyurethane, wherein the proportion range of the gas foaming agent and the thermoplastic polyurethane is 1:200, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder cylinder with the molten thermoplastic polyurethane by a double-screw extruder to form a mixture of a polymer-gas homogeneous system when the pressure value of the gas foaming agent injected into the extruder cylinder reaches 4 kpa;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: injecting the prepared thermoplastic polyurethane polymer foam body by using a 16mm special-shaped intercepting type porous injection nozzle through an injection process, and injecting the prepared thermoplastic polyurethane polymer foam body into a mother die below the mother die in a foaming strip mode, wherein the temperature of the mother die is set to be 50 ℃, the mother die can move forwards, backwards, leftwards and rightwards at a constant speed until the mother die is stacked and filled up, the injection process adopts an injection cylinder storage pressure of 80Kpa, an injection pressure of 50Kpa, an injection speed of 40 cm/sec, a melt temperature value of the thermoplastic polyurethane polymer foam body is 160 ℃, and the injection time is 2 s;
s5: after the inner cavity of the female die is filled in the thermoplastic polyurethane polymer foaming pig house, the female die moves back to a preset original point position, and meanwhile, the female die and a fixedly arranged male die are subjected to hot press forming in an automatic up-and-down die closing mode, the hole opening diameters of the male and female die exhaust holes are 0.6mm and 8mm respectively, the number of the male die exhaust holes is 80, the number of the female die exhaust holes is 25, the setting temperature is controlled at 50 ℃, and the setting time is 15 min;
s6: and opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection stripe lines.
The TPU polymer foaming body is formed by quantitatively and fully mixing a gas foaming agent and molten thermoplastic polyurethane rubber in a ratio of 1:200 and then is injected into a mold for shaping through a 4mm nozzle hole, the detection density of the produced thermoplastic polyurethane shoe insole is 0.22-0.33 g/cm high speed forging, the rebound rate is 52-70%, the hardness value is 45-60C, the sole grain distribution is sparse compared with that of a sole produced through the 4mm nozzle hole, the weight is light, the rebound resilience and the hardness are moderate, and the wearing is most comfortable.
Example 3:
a preparation process of a thermoplastic polyurethane foamed sole with injection strip lines comprises the following steps:
s1: adding a gas foaming agent and thermoplastic polyurethane according to the content of the gas foaming agent in the thermoplastic polyurethane, wherein the proportion range of the gas foaming agent and the thermoplastic polyurethane is 1:25, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder cylinder with the molten thermoplastic polyurethane by a double-screw extruder to form a mixture of a polymer-gas homogeneous system when the pressure value of the gas foaming agent injected into the extruder cylinder reaches 6 kpa;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: injecting the prepared thermoplastic polyurethane polymer foam body by using a 36mm special-shaped intercepting type porous injection nozzle through an injection process, and injecting the prepared thermoplastic polyurethane polymer foam body into a female die below the female die in a foaming strip mode, wherein the temperature of the female die is set to be 40 ℃, the female die can move forwards, backwards, leftwards and rightwards at a constant speed until the female die is stacked and filled up, the injection process adopts an injection cylinder for storing 50Kpa, an injection pressure of 100Kpa, an injection speed of 80cm for blowing/s, a melt temperature value of the thermoplastic polyurethane polymer foam body is 160 ℃, and the injection time is 2 s;
s5: after the inner cavity of the female die is filled in the thermoplastic polyurethane polymer foaming pig house, the female die moves back to a preset original point position, and meanwhile, the female die and a fixedly arranged male die are subjected to hot press forming in an automatic up-and-down die closing mode, the hole opening diameters of the male and female die exhaust holes are 0.5mm and 1mm respectively, the number of the male die exhaust holes is 80, the number of the female die exhaust holes is 40, the setting temperature is controlled at 90 ℃, and the setting time is 5 min;
s6: and opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection stripe lines.
The gas foaming agent and the molten thermoplastic polyurethane rubber in a ratio of 1:50 are quantitatively and fully mixed to form a TPU polymer foaming body, the TPU polymer foaming body is injected into a mold through a 6mm nozzle hole for shaping, the detection density of the produced thermoplastic polyurethane shoe midsole is 0.2-0.31 g/cm high-speed thin-wall steel, the rebound rate is 48-68%, the hardness value is 40-60C, the tread width of the shoe sole is wide, and the distribution is sparse compared with that of the shoe sole produced through the 16mm nozzle hole.
The sole prepared by the embodiment has no bubbles, and has good rebound effect and good wear resistance.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a take thermoplastic polyurethane foaming sole of injection strip line which characterized in that: the foaming sole is prepared by adding a gas foaming agent into thermoplastic polyurethane at a ratio of 1: 25-200, fully mixing a double screw and a single screw to form a TPU polymer foaming material, injecting the foaming material into a mold through extrusion and injection, performing hot pressing, mold closing and shaping, wherein injection strip lines with the width of 1-60 mm are uniformly distributed on the foaming sole, and deep color isolation strip lines are arranged between the extrusion injection strip lines.
2. A preparation process of a thermoplastic polyurethane foaming sole with injection strip lines is characterized by comprising the following steps:
s1: adding a gas foaming agent and thermoplastic polyurethane according to the content of the gas foaming agent in the thermoplastic polyurethane, wherein the proportion range of the gas foaming agent and the thermoplastic polyurethane is 1: 25-200, putting the thermoplastic polyurethane raw material into a double-screw extruder through a weight-loss limited accurate feeder for shearing, and performing heating treatment by matching with a single-screw heating device to form thermoplastic polyurethane in a molten state;
s2: injecting a gas foaming agent according to the proportion of the step S1 during heating treatment, and continuously shearing and uniformly mixing the gas foaming agent injected into the extruder barrel and the molten thermoplastic polyurethane by a double-screw extruder to form a mixture of a polymer-gas homogeneous system under the condition that the pressure value of the gas foaming agent injected into the extruder barrel is 1-8 kpa;
s3: continuously cooling the mixture of the polymer-gas homogeneous system through a single-screw extruder, so that melt pressure generated in the conveying process of the mixture destroys the equilibrium state of the polymer-gas homogeneous system in the material to form a thermoplastic polyurethane polymer foam;
s4: injecting the prepared thermoplastic polyurethane polymer foam body by using a special-shaped intercepting type porous injection nozzle through an injection process, injecting the foam strip into a female die below the injection nozzle in a foaming strip mode, enabling the female die to move forwards, backwards, leftwards and rightwards at a constant speed until the female die is stacked and filled, and carrying out the injection process by adopting an injection cylinder with the storage pressure of 10-150 Kpa, the injection speed of 10-150 cm, the melt temperature value of the thermoplastic polyurethane polymer foam body of 140-220 ℃ and the injection time of 1-6 s;
s5: after the thermoplastic polyurethane polymer foaming strip is injected to fill the inner cavity of the female die, the female die moves back to a preset original point position, and meanwhile, the female die and a fixedly arranged male die are subjected to hot press forming in an automatic up-and-down die closing mode, in the hot press forming process, the male die and the female die are provided with exhaust holes, the setting temperature is controlled to be 50-90 ℃, and the setting time is 5-15 min;
and S6, opening the mold after the molding processing is finished, and finishing the preparation process of the thermoplastic polyurethane foamed sole with the injection strip lines.
3. The process for preparing the thermoplastic polyurethane foam sole with the injection strip texture as claimed in claim 2, wherein the injection strip texture is prepared by the following steps: the gas foaming agent comprises carbon dioxide, nitrogen, butane, isobutane, fluorine-containing gas, methanol, ethanol and dimethyl ether.
4. The process for preparing the thermoplastic polyurethane foam sole with the injection strip texture as claimed in claim 2, wherein the injection strip texture is prepared by the following steps: the double-screw extruder is mainly responsible for heating and melting raw materials and uniformly mixing foaming gas, and the single screw is mainly responsible for conveying and cooling the polyurethane gas mixture to form a thermoplastic polyurethane gas foaming material in a molten state.
5. The process for preparing the thermoplastic polyurethane foam sole with the injection strip texture as claimed in claim 2, wherein the injection strip texture is prepared by the following steps: the male die is a turntable for fixing the disc machine, the female die is attached to the disc machine, the platform with the SYZ axis is automatically taken by a manipulator and positioned, the servo motor controls the moving speed and the positioning of the female die on the platform with the SYZ axis, after the foaming strips are stacked and filled in the inner cavity of the female die, the female die is driven by the manipulator to return to the original disc machine, and the male die and the female die are automatically closed to perform hot pressing and combining and shaping.
6. The process for preparing the thermoplastic polyurethane foam sole with the injection strip texture as claimed in claim 2, wherein the injection strip texture is prepared by the following steps: the set temperature of the male die is 60-90 ℃, the temperature of the female die is 30-70 ℃, the male die and the female die are provided with vent holes, the diameter of each vent hole is 0.5-30 mm, the number of the vent holes is 1-400, and the setting treatment time is 5-15 min.
7. The process for preparing the thermoplastic polyurethane foam sole with the injection strip texture as claimed in claim 2, wherein the injection strip texture is prepared by the following steps: the area of the nozzle holes of the special-shaped shutoff multi-hole nozzle is from 3mm to 80mm, and the distribution quantity of the nozzle holes is from 1 to 200.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010009466.3A CN113068898A (en) | 2020-01-06 | 2020-01-06 | Thermoplastic polyurethane foamed sole with injection stripe lines and preparation process thereof |
| PCT/CN2020/075919 WO2021138968A1 (en) | 2020-01-06 | 2020-02-20 | Thermoplastic polyurethane foam sole having injected textures and preparation process therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010009466.3A CN113068898A (en) | 2020-01-06 | 2020-01-06 | Thermoplastic polyurethane foamed sole with injection stripe lines and preparation process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113068898A true CN113068898A (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010009466.3A Pending CN113068898A (en) | 2020-01-06 | 2020-01-06 | Thermoplastic polyurethane foamed sole with injection stripe lines and preparation process thereof |
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| Country | Link |
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| CN (1) | CN113068898A (en) |
| WO (1) | WO2021138968A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114801068A (en) * | 2022-05-14 | 2022-07-29 | 锋特(福建)新材料科技有限公司 | TPU foaming injection molding shoe material mold |
Citations (5)
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|---|---|---|---|---|
| KR19980084143A (en) * | 1997-05-21 | 1998-12-05 | 박수관 | Injection foam having heterogeneous material area |
| CN102612534A (en) * | 2009-11-18 | 2012-07-25 | 积水化成品工业株式会社 | Reresin foamed sheet |
| CN103183955A (en) * | 2011-12-28 | 2013-07-03 | 北京中能江龙科技开发有限公司 | Novel foaming thermoplastic polyurethane elastomer material sole and preparation method thereof |
| CN204278382U (en) * | 2014-10-10 | 2015-04-22 | 瑞安市信德鞋模有限公司 | A kind of sole injection moulding apparatus |
| CN109262935A (en) * | 2018-09-12 | 2019-01-25 | 广东昂斯新材料技术有限公司 | It is a kind of for manufacturing the frothing injection system of thermoplastic polyurethane sole, shoes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002085105A (en) * | 2000-09-05 | 2002-03-26 | Chankonshanshii Kofun Yugenkoshi | Manufacture of shoe sole |
| DE102005050411A1 (en) * | 2005-10-19 | 2007-04-26 | Basf Ag | Shoe soles based on foamed thermoplastic polyurethane (TPU) |
| CN104441409A (en) * | 2014-11-04 | 2015-03-25 | 林仔孺 | Production process of foamed TPU (Thermoplastic polyurethane) sole |
| CN109228444A (en) * | 2018-10-26 | 2019-01-18 | 福建省安职教育服务有限公司 | A kind of carbon dioxide, chloro fluoroethane thermoplastic polyurethane foam injection molding technology |
-
2020
- 2020-01-06 CN CN202010009466.3A patent/CN113068898A/en active Pending
- 2020-02-20 WO PCT/CN2020/075919 patent/WO2021138968A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980084143A (en) * | 1997-05-21 | 1998-12-05 | 박수관 | Injection foam having heterogeneous material area |
| CN102612534A (en) * | 2009-11-18 | 2012-07-25 | 积水化成品工业株式会社 | Reresin foamed sheet |
| CN103183955A (en) * | 2011-12-28 | 2013-07-03 | 北京中能江龙科技开发有限公司 | Novel foaming thermoplastic polyurethane elastomer material sole and preparation method thereof |
| CN204278382U (en) * | 2014-10-10 | 2015-04-22 | 瑞安市信德鞋模有限公司 | A kind of sole injection moulding apparatus |
| CN109262935A (en) * | 2018-09-12 | 2019-01-25 | 广东昂斯新材料技术有限公司 | It is a kind of for manufacturing the frothing injection system of thermoplastic polyurethane sole, shoes |
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| Publication number | Publication date |
|---|---|
| WO2021138968A1 (en) | 2021-07-15 |
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