WO2023191969A1 - Moulage de polyesters de mousse de billes - Google Patents

Moulage de polyesters de mousse de billes Download PDF

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Publication number
WO2023191969A1
WO2023191969A1 PCT/US2023/013100 US2023013100W WO2023191969A1 WO 2023191969 A1 WO2023191969 A1 WO 2023191969A1 US 2023013100 W US2023013100 W US 2023013100W WO 2023191969 A1 WO2023191969 A1 WO 2023191969A1
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WO
WIPO (PCT)
Prior art keywords
foam
molded
mold
article
foam particles
Prior art date
Application number
PCT/US2023/013100
Other languages
English (en)
Inventor
Saumitra BHARGAVA
Jonathan Godfrey
Walter Chris Mercy
Original Assignee
Lifoam Industries, Llc
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
Priority claimed from US17/656,700 external-priority patent/US20220315723A1/en
Application filed by Lifoam Industries, Llc filed Critical Lifoam Industries, Llc
Publication of WO2023191969A1 publication Critical patent/WO2023191969A1/fr

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Classifications

    • 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
    • B29C44/3415—Heating or cooling
    • B29C44/3426—Heating by introducing steam in the mould
    • 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
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering

Definitions

  • This disclosure relates generally to molded polyester bead foam and methods of making molded polyester bead foam articles and, in particular, relates to thicker and stronger molded bead foam polyesters and methods of making thicker and stronger molded bead foam polyester articles.
  • EPS expandable polystyrene
  • thermal insulation and/or impact protection applications are being commercialized as expandable polystyrene (EPS) replacement in thermal insulation and/or impact protection applications.
  • EPS is a widely used bead foam material having a well-established manufacturing process that is easily reproducible.
  • EPS molding is the oldest and fastest (with respect to cycle time) molding process commercially practiced.
  • Other bead foams have gained popularity in recent years, particularly recyclable and biodegradable bead foams formed out of, for example, polylactic acid and/or polyethylene terephthalate.
  • FIG. 1 is a chart depicting flexural strength of molded articles as described in the present disclosure.
  • FIG. 2 is a chart depicting deflection force of molded articles as described in the present disclosure.
  • FIG. 3 is a side view in cross-section of molded articles produced as described in the present disclosure.
  • FIG. 4 is a chart depicting deflection force of molded articles as described in the present disclosure.
  • FIG. 5 is a chart depicting deflection force of molded articles as described in the present disclosure.
  • Methods of making molded polyesters are provided herein including methods of making thicker molded polyesters having improved bead fusion compared to molded polyesters produced using conventional methods, such as molding of expandable polystyrene (EPS).
  • EPS expandable polystyrene
  • the method includes pulling a slight negative pressure cycle simultaneous to steam injection and foam particle introduction, thereby permitting greater control over the temperature of the foam particles before and during molding.
  • the methods of making molded polyesters provided herein may be used to produce molded polyester articles having any suitable thickness, including thicknesses of 2.5 inches (63 mm) or greater with fusion of the foam particles equal to or superior to molded polyester articles of lesser thicknesses.
  • range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.
  • the method includes (i) wetting and heating foam particles introduced into a mold for an article without foam particle fusion. In some embodiments, the method includes (ii) applying a negative pressure cycle in which the foam particles are expanded and fused together to form the article, and then (iii) removing the molded foam article from the mold.
  • expansion of foam particles refers to the process by which foam particles enlarge in size, reducing their density while growing malleable. This is typically accomplished by wetting the foam particles in the presence of heat and/or slight negative pressure cycle.
  • foam particles suitable for molding are typically spherical or cylindrical and include a blowing agent that facilitates expansion, the expansion of the foam particles permits neighboring foam particles to fill in spaces between neighboring particles, regardless of the particles’ shapes.
  • the expansion of the foam particles is necessary for successful molding.
  • the beginning of the expansion of the foam particles marks the beginning of the molding process, so premature expansion of the foam particles before the foam particles are situated in the mold may result in poor or unsuccessful molding, depending on the degree of expansion prior to being situated.
  • fusion of the foam particles refers to the process by which foam particles bond and adhere to one another.
  • foam particle fusion may be accomplished by some intermingling of polymer chains at the surfaces of foam particles in contact with one another, otherwise known as the “bead- to-bead interface.” Following intermingling of polymer at the bead-to-bead interface, the foam particles require more than a nominal degree of force to be separated.
  • a molded foam article is comprised of fused foam particles.
  • a molded foam article retains a shape as a result of the fusion of the foam particles comprising the molded foam article.
  • the “degree of fusion” between particles correlates to how much force is required to separate the foam particles. Without intending to be bound by any particular theory, the degree of fusion is also affected by the uniformity of foam particle fusion throughout a molded article. A greater degree of fusion corresponds to a greater amount of force require to separate the foam particles. There is no standardized test for measuring a degree of fusion, but properties such as flexural strength and resistance to compression depend on the degree of fusion between the foam particles. Thus, the degree of fusion may be approximated through other tests designed to measure flexural strength or deflection force, allowing for a qualitative comparison among samples of molded articles to determine which possess “better fusion” of the foam particles in the molded articles.
  • One such test for measuring fusion is referred to herein as the “cutting test,” in which a molded foam article is cut with a non-serrated utility knife (e.g., a razor blade) to reveal the innermost foam particles. Upon cutting, some of the innermost foam particles are revealed to be loose and separated from the molded foam article. If the inner surface of the molded foam article is colored, such as through the application of a marker, uncolored areas represent voids that previously included poorly fused foam particles. A comparison of the amount of uncolored space between two samples, such as through surface metrology analysis, permits qualitative comparison of the fusion of the foam particles between the samples.
  • a non-serrated utility knife e.g., a razor blade
  • Another test that approximates the degree of fusion is the standard test specified by ASTM C203, which measures the flexural strength of molded foam articles. Without intending to be bound by any particular theory, it is believed that molded foam particles that are fused more uniformly require more force to pull apart and break, after normalizing for density, while loose foam particles would separate more easily. Molded foam particles requiring greater force to pull apart and break correspond to a greater measured flexural strength, while loose foam particles that separate easily correspond to a lesser measured flexural strength. Thus, the flexural strength for a molded foam article with a greater degree of fusion would be greater than the flexural strength for a molded foam article having the same density and constructed from the same material having poorer fusion between the foam particles.
  • an expandable polyethylene terephthalate (ePET) molded article having a density of 0.05 g/cm 3 is expected to have a higher flexural strength than (1) an expandable poly lactic acid (ePL A) molded article having a density of 0.02 g/cm 3 (illustrating a difference in chemical composition), or (2) an ePET molded article having a density of 0.02 g/cm 3 (illustrating a difference in density), even if the ePET molded article having a density of 0.05 g/cm 3 has poorer degree of fusion.
  • ePL A expandable poly lactic acid
  • ePET molded article having a density of 0.02 g/cm 3 illustrating a difference in density
  • the methods described herein have been show n to produce molded articles having improved degree of fusion as compared to molded articles of the same density and same chemical composition produced by conventional methods.
  • the molded foam article produced by the method has a greater flexural strength than a foam article molded using a conventional process, as measured by ASTM C203.
  • Another test that approximates the degree of fusion is the standard test specified by ASTM D3575-14, which measures the compressibility of molded foam articles by measuring the deflection and recovery of a molded foam article through the application of compressive force. Without intending to be bound by any particular theory, it is believed that foam particles that are fused more uniformly exhibit a stronger compression strength while loose beads would simply give way under compressive force. Thus, the compression strength for a molded foam article with a greater degree of fusion would be greater than the compression strength for a molded foam article having poorer fusion between the foam particles. In some embodiments, the molded foam article produced by the method has a greater compression strength than a foam article molded using a conventional process, as measured by ASTM D3575-14.
  • applying a ‘’negative pressure” refers to subjecting the system to a slight negative pressure.
  • a “slight negative pressure” refers to subjecting the system to a negative pressure of from about -1.5 inHg (-5.08 kPa) to about -8 inHg (-27.09 kPa), such as from about -0.5 inHg (-1.69 kPa) to about -2 inHg (-6.77 kPa).
  • Conventional EPS molding processes typically subject the mold to a negative pressure of -20 inHg (-67.73 kPa) to -28 inHg (-94.82 kPa).
  • foam particle fusion refers to foam particles having no, or only a nominal degree of, adhesion to neighboring foam particles, as indicated for example by having no more than 5% of the separation force required following completion of the molding process.
  • a “mold” refers to a cavity having the shape of the molded foam article.
  • the mold may have two or more separable parts that facilitate opening the mold for removal of the molded foam article.
  • the separable parts of the mold may have a plurality of apertures configured to permit the passage of gases, such as for the introduction of steam or the removal of air, steam, and/or other gases through the application of a negative pressure cycle.
  • the method is effective to yield a molded article which has greater fusion uniformity than a foam article molded using a conventional process. That is, the degree to which foam particles are fused together within a molded article is consistent among different regions within the molded article. This is an advantageous result of the manner in which the foam particles are heated and wetted in the presently disclosed methods.
  • ASTM C203 and/or ASTM D3575-14 may allow approximation of the uniformity of foam particle fusion. When either or both of these tests are performed on multiple samples from the same molded article, the uniformity of foam particle fusion may be approximated by evaluating the uniformity of the flexural strength and deflection force measurements.
  • the error bars in the charts in FIGS. 1, 2, 4, and 5 represent the uniformity of the flexural strength or deflection force, and are indicative of the uniformity of foam particle fusion in those molded articles.
  • the method includes introducing foam particles into the mold while simultaneously introducing steam into the mold.
  • control systems prevent users and/or the equipment from introducing steam during the particle filling step. Instead, users must first fill the mold with foam particles, and subsequently introduce steam. Such control systems are in place to prevent premature introduction of steam which may result in premature expansion of the foam particles, as described previously.
  • introducing steam during the filling process results in some steam escaping the mold without wetting or heating the foam particles, resulting in some steam being “wasted.”
  • introducing steam during the particle filling step can improve wetting of the foam particles compared to the introduction of steam after the foam particles have been introduced and settled within the mold.
  • This simultaneous steam introduction during particle introduction unexpectedly permits the molding of thicker molded foam articles while maintaining or improving fusion of the foam particles as compared to conventional molding processes.
  • the process consumes less steam and requires less energy than a conventional process, despite the possibility of some steam being lost during bead fill and the bead wetting process.
  • the method includes injecting steam into the mold while applying the slight negative pressure cycle in which the foam particles are expanded and fused together to form the article.
  • the method includes applying slight negative pressure cycle to the mold simultaneously with the introduction of the foam particles and the steam.
  • control systems prevent users and/or the equipment from applying slight negative pressure cycle during the particle filling step. Instead, users must first fill the mold with foam particles, subsequently introduce steam, and subsequently apply negative pressure cycle. Such control systems are in place to prevent premature application of slight negative pressure cycle which may result in accelerated consumption of steam.
  • applying slight negative pressure cycle during the introduction of foam particles and steam such as through the implementation of custom software, hardware, actuators, valves, or a combination thereof, can improve wetting of the foam particles by better controlling the temperature of the foam particles.
  • weting and heating foam particles introduced into the mold includes (a) introducing the foam particles into the mold, and then (b) introducing steam into the mold while venting the mold, wherein the venting is effective to prevent the foam particles from collapsing.
  • control systems prevent users and/or the equipment from introducing steam while venting the system.
  • conventional molding equipment is configured to be mounted on a steam chest so that steam can be introduced into the mold without permiting steam to escape, allowing steam to accumulate and surround the mold.
  • These conventional systems prevent venting during steam introduction because some steam will escape the mold without weting or heating the foam particles, resulting in some steam being “wasted.”
  • venting the mold while introducing steam such as through the implementation of custom software, hardware, actuators, valves, or a combination thereof, can improve weting of the foam particles without excessive heating of the foam particles. Without intending to be bound by any particular theory, it is believed that venting the mold during steam introduction allows for greater control over the temperature of the foam particles so that the foam particles are prevented from collapsing or overheating.
  • “collapsing” of the foam particles refers to the phenomenon in which the foam particles expand for an extended period of time, passing through the regime of decreasing density characteristic of expandable foams and entering a regime of increasing density.
  • the increase in density results from the complete degas of a blowing agent, marking the end of the foam particle’s ability to expand further.
  • the blowing agent dissipates, the foam particle begins to decrease in size, resulting in an increased density.
  • Foam particles that have collapsed are no longer suitable for molding because they lose the ability to fill in gaps that exist between neighboring foam particles.
  • the steam introduced into the mold heats the mold to a first temperature. After the mold has been filled with foam particles, the mold is subsequently cooled to a second temperature during the negative pressure cycle.
  • the first temperature is less than 30 °C higher than the second temperature. In some embodiments, the first temperature is about 10 °C higher than the second temperature.
  • the introduction of steam results in a temperature increase of 40 °C or greater.
  • a conventional expandable polypropylene (EPP) molding process has a AT of between 100-160 °C depending on the machine and/or process.
  • Conventional expandable polystyrene (EPS) molding processes have a AT of 45-60 °C depending on the machine and/or process.
  • the molded foam articles produced by the method may have any suitable thickness greater than 0.75 inches (19 mm), including thickness of around 3 inches (76.2 mm), around 6 inches (154 mm), around 12 inches (305 mm), greater than 12 inches (305 mm), or any thickness therebetween.
  • the molded foam article produced by the method has a thickness in at least one dimension of 0.75 inches (19 mm) or greater.
  • the molded foam article produced by the method has a thickness of at least 2.5 inches (63 mm) in at least one dimension.
  • the “thickness” of a molded foam article refers to the smallest dimension of the molded foam article.
  • a molded foam article in the form of a monolithic panel has a relatively large length and width, but a relatively small thickness.
  • a molded foam panel may have a length of 8 inches (203 mm), a width of 10 inches (254 mm), and a thickness of 2.5 inches (63.5 mm).
  • Another example of a molded foam article is a molded box having five sides. The box may be 8 inches (203 mm) x 6 inches (152 mm) x 10 inches (254 mm) with a side-wall thickness of 1.5 inches (38 mm).
  • the overall molding time of the method for molding the foam article is at least 50% less than an overall molding time of a conventional expandable polystyrene molding process.
  • the “overall molding time” of a process involves every step from closure of the mold to opening of the mold, including foam particle introduction, steam introduction, and application of negative pressure cycle.
  • the time prior to closure of the mold can vary widely based on the equipment used, such as the equipment used for actuating the mold halves, and on the geometry of the molded article.
  • Conventional molding processes include a number of sequential steps, including initial steaming, particle filling, hydraulics, direct steaming, cooling, and stabilization/hold.
  • Conventional expandable polystyrene (EPS) molding processes considered the “fastest” commercial molding processes, have an overall molding time of around 60-65 seconds.
  • the method described herein has an overall molding time that is at least 50% less than the overall molding time of an EPS process for the same geometry.
  • the method described herein has an overall molding time of around 18-22 seconds or less.
  • the steam is introduced into the mold at an angle tangential to a side of the mold so as to agitate the foam particles with the mold and improve wetting of the foam particles.
  • a mold having a substantially cylindrical shape may have steam introduced at an angle tangential to the circular cross-section of the cylindrical shape, resulting in a tortious effect on the foam particles so that they rotate within the mold.
  • the foam particles comprise homopolymers, graft polymers, blends or copolymers of poly(butylene succinate), polyethylene terephthalate), poly(lactic acid), poly(poly(hydroxy but rate)), poly(butylene terephthalate), poly(caprolactone), poly(butylene adipate terephthalate), poly(hydroxy alkonate), or blends thereof.
  • the foam particles include low crystallinity poly(lactic acid) foam beads.
  • Conventional expandable polystyrene molding machines have been adapted to mold foam articles comprising materials other than polystyrene provided those materials have high crystallinity, or provided the crystallinity of those materials is increased prior to foaming/expansion. It has been unexpectedly discovered that simultaneous steaming, particle filling, vacuum application, and/or venting allows for the molding of foam articles comprising materials with lower crystallinities previously incapable of molding.
  • Molded articles were produced as described herein and compared to molded articles produced by the method described in U.S. Patent No. 10,688,698 to Lifoam Industries LLC. All tested molded articles were formed from poly (lactic acid). All tested molded articles were 16.2 inches (411.5 mm) x 13.2 inches (335 mm) x 2.5 inches (63.5 mm). The molded articles produced as described herein were molded in a Kurtz Ersa Corporation K68 HP5 Top-Line molding machine, available commercially from Kurtz Ersa Corporation, Kreuzwertheim, Germany. The molding machine was modified with custom software to enable the simultaneous introduction of steam during foam particle introduction. The process parameters are presented in Table 1.
  • the method as described herein may produce molded articles 40% faster than the method described in U.S. Patent 10,688,698. Less time is needed for steam because no steam is used to pre-heat the mold in the present method. Furthermore, the AT of the present method is 45% lower than the method described in U.S. Patent 10,688,698, representing lower energy consumption, faster molding, and faster turn-around to molding of subsequent articles.
  • FIG. 1 is a chart depicting the flexural strength of the 2.5 inch (63.5 mm) panels produced in this Example, as measured by ASTM C203.
  • the panels produced by the present method had greater flexural strength and less variability among samples, representing improved fusion of the foam particles in the molded article produced by the present method compared to molded articles produced as described in U.S. Patent 10,688,698. Furthermore, the differences between the two are statistically significant as indicated by a p-value less than 0.05.
  • FIG. 2 is a chart depicting the deflection force of the 2.5 inch (63.5 mm) panels produced in this Example, as measured by ASTM D3575-14.
  • the panels produced by the present method withstood greater deflection force with less variability among samples, again representing improved fusion of the foam particles in the molded article produced by the present method compared to molded articles produced as described in U.S. Patent 10,688,698. Furthermore, the differences between the two are statistically significant as indicated by a p-value less than 0.05.
  • Table 1 Process Parameters for Comparison with U.S. Patent 10,688,698
  • Molded articles were produced as described herein and compared to molded articles produced by the method described in U.S. Patent No. 10,688,698 to Lifoam Industries LLC.
  • the mold was vented during steam introduction. All tested molded articles were formed from poly(lactic acid). All tested molded articles were 9 inches (229 mm) x 9 inches (229 mm) x 1.5 inches (38 mm). The molded articles produced as described herein were molded in a Kurtz Ersa Corporation K68 HP5 Top-Line molding machine, available commercially from Kurtz Ersa Corporation, Kreuzwertheim, Germany. The molding machine was modified with custom software to enable the simultaneous venting during introduction of steam and foam particle introduction.
  • FIG. 3 depicts the inside of a molded article 302 produced by the method described in U.S. Patent No. 10,688,698 and the inside of a molded article 304 produced by the method described herein, with simultaneous venting during introduction of steam and particle introduction. Molded foam particles 306 are distinguishable from neighboring particles. As a result of the cutting test, some foam particles are dislodged and leave behind voids 308, illustrating the degree of fusion between the foam particles.
  • FIG. 3 illustrates that the degree of fusion in the molded article 304 produced by the method described herein is qualitatively improved over the molded article 302 produced by the method described in U.S. Patent No. 10,688,698.
  • FIG. 4 is a chart depicting the deflection force of the 1.5 inch (38 mm) panels produced in this Example, as measured by ASTM D3575-14.
  • the panels produced by the present method withstood greater deflection force with less variability among samples, again representing improved fusion of the foam particles in the molded article produced by the present method compared to molded articles produced as described in U.S. Patent 10,688,698. Furthermore, the differences between the two are statistically significant as indicated by a p-value of about 0.05.
  • Example 3 Comparison with Previous Molding Process and with EPS Process
  • Molded articles were produced as described herein and compared to molded articles produced by the method described in U.S. Patent No. 10,688,698 to Lifoam Industries LLC and to molded articles produced using a conventional EPS process.
  • the molded articles produced using the method described herein and described in U.S. Patent No. 10,688,698 were formed from poly(lactic acid), while the conventional EPS process used expandable polystyrene. All tested molded articles were in the form of an open box that was 8 inches (203 mm) x 6 inches (152 mm) x 10 inches (254 mm) with a side-wall thickness of 1.5 inches (38 mm).
  • FIG. 5 is a chart depicting the deflection force of the 1.5 inch (38 mm) panels produced in this Example, as measured by ASTM D3575-14. The panels produced by the present method withstood greater deflection force with less variability among samples as compared to the molded articles produced as described in U.S. Patent 10,688,698.
  • the differences between the two are statistically significant as indicated by the p-value less than 0.05.
  • the panels produced by the present method withstood lesser deflection force than the traditional EPS process, but the panels produced by the present method were formed from poly(lactic acid) and are therefore biodegradable. This reduced deflection force was accompanied by less variability among samples, representing a more uniform fusion throughout the molded article.
  • Example 4 Comparison of Cycle Time, Steam Time, and AT with EPS Process
  • the method of the present disclosure is nearly 40 seconds faster than a traditional EPS Process, requiring lower steam time and a lower AT, which corresponds to less energy consumption.
  • the necessary direct steam can be reduced from around 13 seconds to around 1 or 2 seconds.
  • lack of cooling water use in the new process While conventional molding processes prevented the introduction of steam during foam particle introduction, typically motivated by a desire to prevent wasting steam, it has been unexpectedly discovered that the overall cycle time and steam time can be dramatically reduced, despite the potential for wasting steam by introducing steam during particle filling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molding Of Porous Articles (AREA)

Abstract

L'invention concerne des procédés de fabrication d'articles en mousse moulée. Les procédés consistent à introduire de la vapeur dans un moule simultanément au remplissage du moule avec des particules de mousse. Le procédé peut être mis en œuvre plus rapidement et avec un ΔT inférieur à celui des processus de moulage classiques, permettant une exécution plus rapide de la production d'articles moulés ultérieurs. Les articles moulés produits par le procédé peuvent avoir des parois latérales plus épaisses et une fusion de particules de mousse améliorée par rapport aux processus de moulage classiques.
PCT/US2023/013100 2022-03-28 2023-02-15 Moulage de polyesters de mousse de billes WO2023191969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17/656,700 US20220315723A1 (en) 2021-04-05 2022-03-28 Molding of bead foam polyesters
US17/656,700 2022-03-28

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WO2023191969A1 true WO2023191969A1 (fr) 2023-10-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358459B1 (en) * 1998-12-29 2002-03-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschunge. V. Method for the production of molded bodies from polymer foam particles
WO2016085536A1 (fr) * 2014-11-26 2016-06-02 Lifoam Industries, Llc Procédé de moulage d'articles en mousse
US20160332337A1 (en) * 2013-12-19 2016-11-17 Kurtz Gmbh Injector for filling a mold with plastic particles
US20210206037A1 (en) * 2016-01-18 2021-07-08 Kurtz Gmbh Device and Method for Producing a Particle Foam Part

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358459B1 (en) * 1998-12-29 2002-03-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschunge. V. Method for the production of molded bodies from polymer foam particles
US20160332337A1 (en) * 2013-12-19 2016-11-17 Kurtz Gmbh Injector for filling a mold with plastic particles
WO2016085536A1 (fr) * 2014-11-26 2016-06-02 Lifoam Industries, Llc Procédé de moulage d'articles en mousse
US10688698B2 (en) 2014-11-26 2020-06-23 Lifoam Industries, Llc Method of molding foam articles
US20210206037A1 (en) * 2016-01-18 2021-07-08 Kurtz Gmbh Device and Method for Producing a Particle Foam Part

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