WO2022058335A1 - Fabrication d'un composant de chaussure moulé par expansion - Google Patents

Fabrication d'un composant de chaussure moulé par expansion Download PDF

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Publication number
WO2022058335A1
WO2022058335A1 PCT/EP2021/075294 EP2021075294W WO2022058335A1 WO 2022058335 A1 WO2022058335 A1 WO 2022058335A1 EP 2021075294 W EP2021075294 W EP 2021075294W WO 2022058335 A1 WO2022058335 A1 WO 2022058335A1
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WO
WIPO (PCT)
Prior art keywords
polymer
shoe
blowing agent
pressure
foam
Prior art date
Application number
PCT/EP2021/075294
Other languages
German (de)
English (en)
Inventor
Nils ALTROGGE
Jean Philippe ROMAIN
Nicolas HUTTON
Changwoo Shin
Ilmarin Heitz
Original Assignee
On Clouds Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by On Clouds Gmbh filed Critical On Clouds Gmbh
Publication of WO2022058335A1 publication Critical patent/WO2022058335A1/fr

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Classifications

    • 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
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B29C44/3446—Feeding the blowing agent
    • B29C44/3453—Feeding the blowing agent to solid plastic material
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3461—Making or treating expandable particles
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3469—Cell or pore nucleation
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
    • B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
    • 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
    • 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
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • C08J9/16—Making expandable particles
    • C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
    • 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
    • C08J9/22—After-treatment of expandable particles; Forming foamed products
    • C08J9/228—Forming foamed products
    • C08J9/232—Forming foamed products by sintering expandable particles
    • 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
    • C08J9/36—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B29K2021/003—Thermoplastic elastomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • 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
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/22—Thermoplastic resins
    • 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
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/26—Elastomers
    • 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
    • C08J2371/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
    • C08J2371/02—Polyalkylene oxides
    • 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
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids

Definitions

  • the present invention relates to the technical field of shoe manufacture, in particular foamed shoe components, and relates to a method for producing a molded foamed shoe component.
  • Molded foam materials have a large number of pores or cells in the foam material, which means that molded foam materials are particularly suitable as cushioning elements, such as shoe soles.
  • foams are made using blowing agent additives.
  • a polymeric material typically a thermoplastic polymer such as thermoplastic polyurethane, is thereby melted in an extruder.
  • a blowing agent additive is typically added to the polymer material, which expands under predefined conditions and can form the pores or cells in the molded foam material.
  • blowing agent additives a distinction is typically made between chemical and physical blowing agents.
  • Physical blowing agents are those that can expand directly by changing physical parameters, such as pressure and temperature, or can change from the liquid or solid state of aggregation to the gaseous state.
  • blowing agents are CO 2 , nitrogen, water, hydrocarbons such as propane, butane, pentane or hexane, and hydrocarbon derivatives, in particular halogenated derivatives such as dichloromethane, chloroform or fluorocarbons.
  • Chemical blowing agents are blowing agents from which a blowing agent can be released in situ under predetermined conditions by chemical reaction. These include, for example, diazo compounds (liberation of N 2 ), metal hydrides (liberation of H 2 ) and carbonates (liberation of CO 2 ).
  • Blowing agents that are available as supercritical fluids (SCF) have established themselves as a special case among physical blowing agents. The best-known process in which SCFs are used is the so-called MuCell® process.
  • a polymer composition is mixed with a SCF in an extruder to form a single-phase mixture and then injected into a mold.
  • a drop in pressure in the mold causes the blowing agent to separate from the polymer solution and vaporize, resulting in the formation of microcells.
  • CO 2 or nitrogen is usually used as the SCF.
  • a problem with foam molding with blowing agents is controlling the pore size in the foam.
  • foaming with SCF is widely used with thermoplastic polyurethane, it is still problematic with other materials, particularly polyamides and copolymers thereof.
  • Controlling the pore size of the foam is particularly relevant for shoe components, especially in the area of running shoes, since on the one hand the lowest possible density should be achieved in order to reduce the overall weight of the shoe and on the other hand a high degree of stability must be guaranteed.
  • the control of the pore size can be significantly improved by means of supercritical fluids, the use of supercritical fluids is costly and not ecological since a relatively high level of energy is required to provide the required high pressures and temperatures.
  • a method is provided in which the formation of pores, in particular the pore size of the foamed material, can be controlled more precisely.
  • a method is provided which makes it possible to produce a foamed shoe component that has a low density, but at the same time ensures high stability.
  • a more energy-efficient method for producing a molded foam shoe component compared to the prior art is provided.
  • a first aspect relates to a method for producing a molded foam shoe component, in particular a running shoe component, comprising the steps: a. providing a polymer granulate; b. Pretreating the polymer granules comprising binding a first physical blowing agent to or in the polymer granules at a first pressure and a first temperature; c. Foam molding the pretreated polymer granules in a foam molding system, the foam molding system comprising: i. a barrel having a barrel lead, the barrel defining a processing space with a screw disposed therein; ii. a propellant supply in fluid communication with the processing space; iii. a nozzle in fluid communication with the processing space; and iv.
  • the foam molding comprises: the introduction of a second physical blowing agent by means of the blowing agent feed and the introduction of the in step b. pretreated polymer granules into the processing space through the drum feed line which is in fluid communication with the processing space; Melting the polymer granules in the processing room to produce a molten, in particular single-phase, polymer composition; and injecting the molten polymer composition into the mold cavity and foaming the polymer composition by expansion of the first and/or second blowing agent.
  • additional blowing agent is introduced into the polymer granulate before it is introduced into the drum.
  • the pore size and pore structure can be controlled more precisely via the amount of bound first blowing agent. It has been found that the first blowing agent can be retained in the polymer granules for a relatively long period of time, in particular for several hours. Typically, the polymer granules are melted in the processing room on the one hand and the polymer granules and the first blowing agent bound thereto are mixed on the other hand, in particular to form a single-phase system.
  • the pretreatment of the polymer granules with the first blowing agent can include impregnation, for example.
  • the first blowing agent can bind to the surface of the polymer granules. This can include both the binding of the first blowing agent on the outer surface and the binding within the polymer granules, with the blowing agent diffusing into the polymer granules.
  • the pre-treatment has the advantage, among other things, that the foam-molded component shows less material shrinkage and distortion after production than a foam-molded component which is only produced according to a process consisting of step c. will be produced.
  • the polymer granules can typically have a certain porosity, so that the first blowing agent can penetrate better into the individual polymer particles.
  • the first pressure and the first temperature are greater than normal pressure (1 bar) or higher than room temperature (25° C.).
  • first pressure and first temperature or second pressure, second temperature, etc.
  • the process according to the invention enables the production of a foam-moulded shoe component with smaller pores in the foam and a significantly more homogeneous distribution of the pores over the entire foam-moulded component.
  • Typical examples of suitable commercially available polymer granules which can be used directly without further pretreatment, are polyether blockamide such as PEBAX 2533 (CAMPUSplastics), PEBAX 3533 (CAMPUSplastics), PEBAX 35R53 (CAMPUSplastics), or polyamide such as RILSAN BZMNO (CAMPUSplastics, PA1 1), VESTAMID E40 -S3 (Evonik Industries AG, PA1 2), VESTAMID E47-S1 (Evonik Industries AG, PA1 2).
  • polyether blockamide such as PEBAX 2533 (CAMPUSplastics), PEBAX 3533 (CAMPUSplastics), PEBAX 35R53 (CAMPUSplastics), or polyamide such as RILSAN BZMNO (CAMPUSplastics, PA1 1), VESTAMID E40 -S3 (Evonik Industries AG, PA1 2), VESTAMID E47-S1 (Evonik Industries AG, PA1 2).
  • the polymer granules can have a water absorption of 0.8 to 1.2.
  • the density according to ISO 1183 of the polymer granulate is between 0.9 and 1.1 g/cm 3 .
  • the expansion of the first and/or second blowing agent typically occurs as a result of a drop in pressure, which can already occur when the molten polymer composition is injected into the mold cavity, and/or also after the injection, for example by increasing the volume of the mold cavity or by opening valves in the mold. can be triggered.
  • the first and/or the second blowing agent is selected from CO 2 , N 2 and mixtures thereof.
  • CO 2 is to be preferred for the first blowing agent, since this is typically more soluble in the polymer granulate, in particular because of its physico-chemical properties, and is better bound. This applies above all when polar thermoplastic elastomers such as polyurethane, polyamide or derivatives thereof are used.
  • the pretreatment in step b. 3 to 8% by weight, preferably 5 to 6% by weight, of CO 2 , based on the polymer granules, are bound on or in the polymer granules. This allows a foam-moulded
  • Shoe component can be achieved with an advantageous density of about 0.4 g / cm 3 .
  • the mold cavity can be expandable in volume. This typically involves expanding the volume of the mold cavity during injection of the polymer composition and/or during foaming. This can be achieved, for example, by at least one movable wall of the mold, which can be moved in a controlled manner under the control of a control unit, so that the volume of the mold cavity increases.
  • the pretreatment in step b. carried out in a pressure reactor, in particular an autoclave.
  • the first pressure in step b. 25 bar to 55 bar.
  • the first temperature in step b. 0 °C to 150 °C, in particular 40 °C to 120 °C.
  • the first temperature is preferably above room temperature, since this accelerates the binding of the first physical blowing agent on and in the polymer granules. In particular, this increases the depth of penetration of the propellant into the particles of the polymer granules. This is advantageous because blowing agent that has penetrated the granulate remains bound for a significantly longer time. The impregnated polymer granules can thus be stored longer and handled more easily, in particular transferred, without significant amounts of the physical blowing agent being lost.
  • the first temperature selected must not be too high, as this can cause polymer material, in particular thermoplastic material such as polyamide or polyether block amide (PEBA/PEBAX®), to be partially split or degenerate.
  • polymer material in particular thermoplastic material such as polyamide or polyether block amide (PEBA/PEBAX®)
  • PEBA/PEBAX® polyamide or polyether block amide
  • the mold can be maintained at a temperature of 20 to 80°C at least during the injection and foaming of the polymer composition. This can be achieved, for example, by an external heating element or by a mold that can be heated. In particular, the mold can be brought to the predetermined temperature by means of an oil and/or water heating element. The choice of temperature has a significant influence on the density, or the porosity and cell size of the foam.
  • the second physical blowing agent is present as a supercritical fluid, particularly during delivery and/or in the processing space.
  • the supercritical state can be reached before it is introduced into the processing room or in the processing room itself.
  • One advantage of using a supercritical fluid is that a single-phase system of polymer and blowing agent is achieved in the processing room, which results in a low density of the shoe component and a uniform Allows cell distribution in the foam. This is particularly relevant for shoe components such as soles, as an uneven distribution of the cells in the foam can mean that the foam is more flexible in some areas than in others, which can lead to an uncomfortable walking sensation and even anatomical misalignments.
  • the proportion of the supercritical fluid should be reduced from an energetic and ecological point of view, since reaching the supercritical state is energy-intensive due to the high pressure and temperature required.
  • the amount of supercritical fluid required in step c. can be significantly reduced without any loss in the quality of the foam-moulded shoe component.
  • the mold of the foam molding system is equipped with a gas counter-pressure device, by means of which a counter-pressure, preferably from >0 bar to 40 bar, in particular 1 bar to 40 bar, is applied to the Polymer composition can be exercised.
  • the expansion of the blowing agent can be slowed down or weakened by exerting a counter-pressure. This enables better control of the pore size and cell structure of the foam-moulded component, as well as more even distribution.
  • the polymer granules in step b. maintained at the first pressure and temperature for 2 hours to 8 hours, preferably for 2 hours to 5 hours. Typically, this period of time is sufficient to bind a sufficient amount of the first blowing agent on or in the polymer granules.
  • pretreated polymer granules are fed under a second pressure into the foam molding system, in particular into the processing room.
  • the second pressure can preferably be at least 50%, in particular at least 75%, in particular at least 90%, in particular at least 95%, in particular at least 100% of the first pressure. This ensures that no significant amount of bound blowing agent is desorbed during transfer into the foam molding system. It has been found here that a pressure which is only 50% of the first pressure is already sufficient to essentially prevent the desorption.
  • the second pressure is typically no more than 200%, in particular no more than 150%, in particular no more than 100% of the first pressure.
  • the polymer granules have a Shore hardness of 70 to 85.
  • the polymer granulate has a density of 0.9 g/cm 3 to 1.5 g/cm 3 , preferably 1.0 g/cm 3 to 1.2 g/cm 3 .
  • the use of polyamide and polyether block amide as polymer granules is particularly advantageous with regard to the uptake and absorption of the first physical blowing agent, in particular CO 2 .
  • the polymer granulate comprises a thermoplastic elastomer, in particular a polyamide, a polyether block amide or a thermoplastic polyurethane.
  • the polymer granulate can consist of a thermoplastic elastomer, in particular a polyamide, a polyether block amide or a thermoplastic polyurethane.
  • the shoe component is a shoe sole, in particular a midsole.
  • a shoe sole can be provided in that the mold cavity of the mold of the foam molding system is designed in such a way that during the foam molding in step c. a shoe sole is created.
  • the step c. produced shoe component represent a blank of a shoe component, which is processed in a subsequent process step to the finished shoe component.
  • this can be a blank for a shoe sole, which is then pressed into a finished sole by compression molding or which is then colored or surface-treated in some other way.
  • the molded foamed shoe component produced can be reshaped by compression molding, in particular in a compression molding press.
  • the nozzle can be designed so that it can be closed and, in particular, can only be open for an injection period during the injection of the polymer composition. The injection duration can be between 0.5 seconds and 2 seconds, for example.
  • the molded foam shoe component is a shoe sole, in particular a midsole, and can be connected to a shoe upper in an additional step, so that a shoe, in particular a running shoe, is produced.
  • a further aspect relates to a foam-moulded shoe component, in particular a shoe sole, produced by a method according to the embodiments disclosed here.
  • the molded foam shoe component may have a density of from 0.15 g/cm 3 to 0.5 g/cm 3 , preferably from 0.25 g/cm 3 to 0.5 g/cm 3 , preferably 0.3 g/cm 3 .
  • the molded foam shoe component can have an Asker C hardness of 40 to 65, in particular 45 to 65.
  • the molded foam shoe component can have pores or cells.
  • the pores can have a pore size, or the cells can have a cell size, from 30 ⁇ m to 1600 ⁇ m, in particular from 300 ⁇ m to 1600 ⁇ m, in particular from 600 ⁇ m to 1000 ⁇ m.
  • the pore size is smaller in a first region of the shoe component than in a second region.
  • the shoe component is a midsole having a top and a bottom, wherein the Top side in the operative state, ie when worn, faces the wearer's foot and the bottom side faces the ground.
  • the first portion of the midsole is closer to the top of the midsole than the second portion of the midsole.
  • the pores in the first area can have a pore size of 30 ⁇ m to 500 ⁇ m, in particular from 100 ⁇ m to 300 ⁇ m.
  • the pores in the second region can also have a pore size of from 300 ⁇ m to 1600 ⁇ m, in particular from 600 ⁇ m to 1000 ⁇ m.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

L'invention concerne un procédé pour fabriquer un composant de chaussure moulé par expansion, en particulier un composant de chaussure de course, comprenant les étapes suivantes : a. la préparation de granulés polymères ; b. le prétraitement des granulés polymères comprenant la liaison d'un premier agent porogène physique sur ou dans les granulés polymères à une première pression et à une première température ; c. le formage par expansion des granulés polymères prétraités dans un système de moulage par expansion, le système de moulage par expansion comprenant : i. un tambour pourvu d'une conduite d'amenée de tambour, le tambour définissant une chambre de traitement dans laquelle est disposée une vis ; ii. une alimentation en agent porogène en communication fluidique avec la chambre de traitement ; iii. une buse en communication fluidique avec la chambre de traitement ; et iv. un moule comportant une cavité de moule qui est en communication fluidique avec la buse. Le moulage par expansion comprend les étapes suivantes : l'introduction d'un second agent porogène physique au moyen de l'alimentation en agent porogène et l'introduction des granulés polymères prétraités à l'étape b. dans la chambre de traitement par l'intermédiaire de la conduite d'amenée du tambour qui est en communication fluidique avec la chambre de traitement ; la fusion des granulés polymères dans la chambre de traitement pour la production d'une composition polymère fondue, en particulier monophasique ; et l'injection de la composition polymère fondue dans la cavité du moule et le moussage de la composition polymère par expansion du premier et/ou du second agent porogène.
PCT/EP2021/075294 2020-09-15 2021-09-15 Fabrication d'un composant de chaussure moulé par expansion WO2022058335A1 (fr)

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CH01161/20A CH717846A2 (de) 2020-09-15 2020-09-15 Verfahren zur Herstellung einer formgeschäumten Schuhkomponente.
CHCH01161/20 2020-09-15

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WO2022058335A1 true WO2022058335A1 (fr) 2022-03-24

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111055420A (zh) * 2019-12-31 2020-04-24 晋江兴迅新材料科技有限公司 一种环保型鞋底的发泡成型工艺及发泡成型设备

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111055420A (zh) * 2019-12-31 2020-04-24 晋江兴迅新材料科技有限公司 一种环保型鞋底的发泡成型工艺及发泡成型设备

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