WO2017077332A1 - Procédé de formation d'objets polymères moussés - Google Patents

Procédé de formation d'objets polymères moussés Download PDF

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Publication number
WO2017077332A1
WO2017077332A1 PCT/GB2016/053458 GB2016053458W WO2017077332A1 WO 2017077332 A1 WO2017077332 A1 WO 2017077332A1 GB 2016053458 W GB2016053458 W GB 2016053458W WO 2017077332 A1 WO2017077332 A1 WO 2017077332A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
mold
polymeric material
charge
polymer
Prior art date
Application number
PCT/GB2016/053458
Other languages
English (en)
Inventor
Eric Degolier
Adam TURVEY
Original Assignee
Design Blue Limited
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 Design Blue Limited filed Critical Design Blue Limited
Priority to GB1809132.2A priority Critical patent/GB2559926B/en
Publication of WO2017077332A1 publication Critical patent/WO2017077332A1/fr

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    • B29C44/34—Auxiliary operations
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    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/381—Spreading the foamable material in the mould by pressing the mould halves together
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    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • B29C44/16—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining shaped by the expansion of the material
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    • B29C44/1228—Joining preformed parts by the expanding material
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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
    • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2383/14—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
    • 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
    • C08J2385/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Derivatives of such polymers
    • C08J2385/04—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing atoms other than silicon, sulfur, nitrogen, oxygen, and carbon; Derivatives of such polymers containing boron

Definitions

  • the present invention relates to methods for forming foamed polymeric articles and articles produced by such methods.
  • the invention relates to a method of forming a foamed polymeric article comprising a foamed polymeric material sandwiched between two layers in a mold, wherein the polymeric material comprises a chemical blowing agent, and the expansion of the polymeric material during foaming causes the outer layers of the article to deform so as to provide good contact with the surfaces of the mold.
  • the present invention further relates to foamed polymeric articles formed by the method of the invention having complex surface geometry and/or good continuity of the foam.
  • Foamed polymeric articles have many uses, including providing cushioning for impact and vibration dampening, resistance to compression, deflection, friction reduction and the like.
  • foamed polymeric articles having various simple structures may be suitable.
  • more complex structures are required, for example if the foamed polymeric articles are intended to fit closely against structures having an uneven surfaces, such as body parts or complex mechanical components, or if additional properties are to be provided by the inclusion of regions having significantly different thicknesses, such as extra thickness to provide improved impact protection in certain areas and reduced thickness to provide greater flexibility in other areas.
  • Such complex foamed polymeric articles may be produced as a single object or may be formed by combining smaller articles on a common base.
  • US 201 1/0277923 discloses a molding system that is said to be suitable for molding very thick products by controlling the rate of mold closure and/or interrupting the mold closure.
  • this process is restricted to the use of mechanically frothed foams, and is not applicable to chemically foamed polymeric materials, such as chemically foamed polyurethane.
  • this process also relies on a vacuum system within the mold to help conform surface layers to the structure of the mold. Reject rates due to inconsistent foam structure and/or the presence of bubbles using the processes disclosed in US201 1/0277923 are not economically acceptable.
  • a foamed polymeric article comprising a foamed polymeric material sandwiched between two layers, the method comprising the steps of:
  • a layer to a mold comprising at least first and second sections, at least one of the sections comprising a mold cavity having a mold profile, the layer being applied to the section comprising the mold cavity such that the profile of the layer is smoother than the mold profile;
  • the further layer may be applied to the section of the mold other than the section to which the layer has been applied, so that the step of applying the further layer onto the charge of polymeric material occurs by closing the mold, i.e. so that steps iii. and iv. are effectively a single step.
  • the chemical foaming of the charge of polymeric material may begin as soon as the charge is applied to the layer, so that step v. begins at the same time as, or even before, the closing of the mold (step iv.). Preferably however, no more than 10% of the foaming is completed before the mold is fully closed.
  • the smoother profile is such that the layer is substantially spaced apart from the mold cavity, and preferably the layer is spaced apart such that it does not contact an inner surface of the mold cavity.
  • the profile of the layer is smoother than the mold profile, the charge of polymeric material may spread more evenly across the layer and, in particular, the formation of air bubbles between the polymeric material and the layer is completely avoided, or at least substantially reduced. This provides substantial improvements in the continuity of the foam, and the reduction or elimination of undesirable bubbles.
  • the layer adheres well to the complex structure of the mold profile improving the definition of the surface structure of the foamed polymeric article.
  • This step of the method is particularly facilitated by the inclusion of vents in the section of the mold comprising the mold cavity, the vents allowing air initially present between the layer and the mold profile to escape from the mold, so as to permit improved contact between the layer and the mold profile.
  • the layer also creates a barrier between the polymeric material and the vents in the mold section, preventing the vents becoming blocked by the polymeric material, and avoids the need for release agents which can block vents, add extra cost and cause post process adhesion issues.
  • the layer may be self-supporting in the mold section before foaming of the polymeric material.
  • the layer is held under tension after being applied to the section of the mold comprising a mold cavity and preferably it is held taut, providing a good surface for the charge of polymeric material to spread over.
  • the layer applied to the section of the mold comprising the mold cavity may comprise any material suitable to act as an outer layer of a foamed polymeric article.
  • the layer comprises a polymer, textile and/or metal.
  • the layer may also be formed from multiple layers of the same or different materials.
  • the layer applied to the section of the mold comprising the mold cavity comprises a polymer comprising one or more materials selected from plastics, elastomeric materials, polyolefins, polyamides, polystyrenes, ethylene-vinyl acetates, nylons, polyesters, polyethylenes, polytetrafluroethylene, silicones, vinyls, polyurethanes, polyvinyl chloride, latex rubbers, synthetic rubbers, thermoplastic elastomers, or mixtures thereof.
  • the layer comprises a textile which a woven or non-woven fabric comprising natural and/or artificial materials, preferably spandex or elastane, cordura, aramids, cotton or canvas.
  • the layer applied to the section of the mold comprising the mold cavity may be any suitable thickness, for example 0.001 mm to 3 mm, such as 0.05 to 0.01 mm.
  • the layer applied to the section of the mold comprising the mold cavity will have a relatively low tensile modulus, such that it will stretch under the typical pressures generated by the chemical foaming of the polymeric material, such as 40 to 60 psi.
  • a greater range of materials and/or thicknesses may be used in the method of the present invention compared to prior art processes, as in most prior art cases (for example using a vacuum to conform the film to the mold surface) much lower pressures are generated.
  • the additional pressure produced in the method of the present invention also enables higher definition of complex products to be achieved.
  • the charge of polymeric material may be applied to the layer in the mold by any suitable method, for example by being poured or injected onto the layer.
  • the charge of polymeric material is applied substantially in the middle of the layer, so that it spreads evenly across the layer during foaming.
  • the charge of polymeric material may be applied to the layer as a single charge.
  • the size of the charge applied to the layer will depend upon the size of the article or articles to be formed and the size of the mold.
  • the charge of polymeric applied to the layer is sufficient to cover from 10 to 100% of the layer before the mold is closed.
  • the polymeric material will fill from 80 to 110% of the mold cavity.
  • any polymeric material capable of being chemically foamed to form a foamed polymeric article when sandwiched between two suitable layers may be used in the method of the present invention.
  • the polymeric material is selected from ethylene vinyl acetate, an olefin polymer, an ethylene polymer, polypropylene, LDPE, HDPE, LLDPE, natural elastomer (e.g. latex), synthetic elastomer (e.g. silicone rubber, polyurethane, ethylene propylene rubber such as EPDM) or thermoplastic elastomer (e.g. polyester).
  • the polymeric material comprises a polymer-based material exhibiting dilatancy, preferably a silicone polymer, for example a borated siloxane polymer, such as PBDMS.
  • the foamed polymeric material is an elastic, energy absorbent material which exhibits a resistive load under deformation which increases with the rate of deformation, such as a composite material which comprises i) a first polymer-based material and ii) a second polymer-based material, different from i), which exhibits dilatancy in the absence of i), wherein the second polymer-based material ii) is entrapped in a matrix of the first polymer-based material i), and which is prepared by incorporating the second polymer- based material ii) with the first polymer-based material i) prior to foaming.
  • Particularly suitable elastic, energy absorbent materials for use in the method of the present invention are disclosed in WO 03
  • any suitable material may be used as the chemical blowing agent in the methods according to the present invention.
  • a chemical blowing agent will cause the charge of polymeric material to foam and may also cause the resulting foam to cure and/or set.
  • Suitable chemical blowing agents include hydrocarbons such as isopentane and cyclopentane or acetals such as dimethoxymethane If required, additional agents may also be included in the charge of polymeric material, such as separate cure/setting agents.
  • concentration of chemical blowing agent used in the methods according to the present invention will depend upon the nature of the polymeric material and the chemical blowing agent and other factors, including the degree of foaming required and the molding conditions.
  • suitable concentrations include from 0.1 wt% to 10 wt%, such as 3 wt% to 5 wt%.
  • the further layer is applied to the section of the mold to which the layer has not been applied and is self-supporting and/or is held under tension, and preferably held taut.
  • the further layer may comprise any material suitable to act as an outer layer of a foamed polymeric article.
  • the further layer may be the same as or different to the layer applied to the section of the mold comprising a mold profile.
  • the further layer comprises a polymer, textile and/or metal.
  • the further layer may also be formed from multiple layers of the same or different materials.
  • the further layer comprises a polymer comprising one or more materials selected from plastics, elastomeric materials, polyolefins, polyamides, polystyrenes, ethylene-vinyl acetates, nylons, polyesters, polyethylenes, polytetrafluroethylene, silicones, vinyls, polyurethanes, polyvinyl chloride, latex rubbers, synthetic rubbers, thermoplastic elastomers, or mixtures thereof.
  • the further layer comprises a textile which a woven or non-woven fabric comprising natural and/or artificial materials, preferably spandex or elastane, cordura, aramids, cotton or canvas.
  • the further layer may be any suitable thickness, for example 0.001 mm to 3 mm, such as 0.05 to 0.01 mm.
  • the layer applied to the section of the mold comprising the mold cavity, or the further layer applied to the other mold section comprises or includes a layer of heat-sensitive adhesive, i.e. it may comprise a heat-sensitive adhesive or may be formed from a material that is not a heat-sensitive adhesive but to which a heat-sensitive adhesive is applied before, during or after the forming of the foamed polymeric article.
  • a heat-sensitive adhesive on the outer surface of foamed polymeric article is particularly advantageous if the article is to be attached to a textile, as the heat sensitive-adhesive may be used to bond the article to the textile.
  • spreading of the charge of polymeric material is caused by pressure from the mold, and particularly by the application of the further layer to the upper surface of the charge of polymeric material by the closing of the mold.
  • the method according to the present invention comprises deforming at least one of the layers, preferably the further layer, to form a convex shape with respect to the mold.
  • the deforming may be caused by a protrusion on the relevant mold section, preferably located substantially at the centre of the section.
  • the protrusion is removable and/or retractable.
  • the protrusion used to deform the layer may be actively removed/retracted during the method or may be caused to retract by the expansion of the polymeric material during foaming.
  • the relatively raised portion of the further layer comes into contact with the charge of polymeric material during the closing of the mold before other sections of the further layer, and, where the relatively raised portion is substantially central, this will cause air present between the upper surface of the charge of polymeric material and the further layer to move laterally away from the point of contact.
  • the combination of this step with the expansion of the polymeric material during foaming and the employment of a relatively smooth profile for the layer to which the charge of polymeric material is applied can totally eliminate, or at least substantially reduce, the formation of bubbles in foamed polymeric articles produced by the method.
  • both sections of the mold comprise a mold cavity, enabling foamed polymeric articles having complex surface geometry on both the upper and lower surfaces to be produced, and undercuts in the geometry can be produced due to the central parting line where the mold shuts.
  • at least one section of the mold is heated, for example to a temperature of from 25 to 120°C, such as from 30 to 100, for example 40 to 60°C.
  • Any suitable mold residence time may be used in methodes according to the present invention, depending upon the materials used and the molding conditions. However, suitable mold residence times are from 2 to 15 minutes, such as 10 minutes.
  • Methods according to the present invention can produce much greater pressures within the mold compared to processes in which the surface of films are conformed to the mold only by a vacuum, for example 4 to 6 times greater pressures.
  • the closed mold may be held under vacuum, for example so that the vacuum aids in conforming the layer applied to the section comprising the mold cavity to the mold profile, and in this case pressures of 5 to 7 times greater than conventional in mold pressures can be produced. This extra force can be used to reproduce finer details in the mold or to push thicker, stronger films into the mold cavity compared to prior art processes.
  • the present invention also provides a foamed polymeric article comprising a foamed polymeric material sandwiched between two layers formed according to the method of the present invention.
  • foamed polymeric articles having very good foam consistency and with virtually no, or substantially reduced, undesirable bubbles may be produced.
  • multiple parts are formed using a single tool, at least 20 parts can be produced all weighing within one gram of each other.
  • foamed polymeric articles produced by the method of the present invention may have complex geometries, including very thin regions or even regions of effectively zero thickness.
  • very small parts may be produced accurately, for example parts having a volume of less than 1 cm 3 and/or parts having widths of as low as 1 mm.
  • the present invention further provides a protective pad formed from a foamed polymeric material according to the present invention.
  • Such protective pads may be formed either as a single component having a complex surface geometry, or may be formed by combining a number of smaller components on a common base material.
  • the present invention further provides a textile article comprising one or more foamed polymeric articles according to the present invention and/or one or more protective pads according to the present invention attached to a textile by a layer of heat- sensitive adhesive.
  • the heat-sensitive adhesive may be applied to the foamed polymeric article or protective pad after it has been formed by a method according to the present invention or during the process of forming.
  • one of the layers between which the foamed polymeric material is sandwiched may comprise or include a heat-sensitive adhesive.
  • the foamed polymeric article or protective pad may be attached to the textile by placing it in contact with the textile so that the heat- sensitive adhesive contacts the textile, and then heating so that the heat-sensitive adhesive fuses the article or pad to the textile.
  • Figure 1 is a schematic diagram depicting a first mold section having a layer applied thereto in a first stage of a method according to an embodiment of the present invention
  • Figure 2 is a schematic diagram showing a second stage of a method according to the embodiment of the present invention
  • Figure 3 is a schematic diagram showing a third stage of a method according to the embodiment of the present invention.
  • Figure 4 is a schematic diagram showing a fourth stage of a method according to the embodiment of the present invention.
  • Figure 5 is a schematic diagram showing a fourth stage of a method according to an alternative embodiment of the present invention.
  • Example 1 illustrates the invention.
  • a first stage of a method according to an embodiment of the present invention is illustrated in Figure 1.
  • a first mold section 1 comprising a mold cavity 3 defined by a mold profile 5 is provided, and a first layer 7 comprising a thermoplastic polyurethane (Bemis OT100) is disposed over the mold cavity 3 so that the profile of the first layer 7 is smoother than the mold profile 5.
  • Bemis OT100 thermoplastic polyurethane
  • FIG. 2 A second stage in the method is shown in Figure 2.
  • a second mold section 9 having a relatively smooth mold profile 1 1 is provided, and a second layer 13 comprising a thermoplastic polyurethane (Bemis OT100) is applied thereto.
  • the second mold section 9 further comprises a retractable pin 15 which is extended so that the second layer 13 is deformed to form a convex shape with respect to the second mold section 9.
  • a charge of polymeric material 17 is applied to the first layer 7 at substantially the centre thereof.
  • the charge of polymeric material 17 comprises a two part polyether based thermoplastic polyurethane, comprising a PU system, such as modelling foam referenced as J-Foam 7087, marketed by Jacobson Chemicals Ltd., premixed with a dilatant and a chemical blowing agent.
  • FIG. 3 A third stage in the method of the present invention is shown in Figure 3.
  • the first mold section 1 and the second mold section 9 are brought into contact, closing the mold cavity 3, and at the same time the charge of polymeric material 17 is spread outwards, so as to substantially cover all of the first layer 7, which is partially extended into the mold cavity 3 but which does not fully fill the cavity, so that the first layer 7 is in only partial contact with the mold profile 5.
  • the retractable pin 15 at least initially remains extended from the second mold section 9, so that the central region of the second layer 13 contacts the charge of polymeric material 17 before the peripheral region of the second layer 13. This facilitates spreading of the charge of polymeric material 17 across the surface of the first layer 7, and also displaces air present between the second layer 13 and the charge of polymeric material 17 laterally, so that it is not entrapped between the second layer 13 and the polymeric material 17.
  • FIG. 4 A fourth stage of the method is shown in Figure 4. As shown in Figure 4, in the fourth stage illustrated, the retractable pin 15 has been displaced completely into the second mold section 9 so that the second layer 13 is flush with the mold profile 1 1 of the second mold section 9. Additionally, chemical foaming of the charge of polymeric material 17 has caused the polymeric material to expand so that the first layer 7 has been displaced fully into the mold cavity 3 and is in close contact with the mold profile 5 of the first mold section 1.
  • the polymeric material 17 is retained in the mold for approximately 10 minutes. Following setting of the charge of polymeric material 17 a foamed polymeric article 19 is formed comprising a foamed polymeric material 17 sandwiched between the first layer 7 and the second layer 13.
  • the foamed polymeric article 19 may be removed from the mold cavity 3.
  • the foamed polymeric article has a substantially flat first surface and a second surface having a complex geometry, as defined by the mold profile 5 of the first mold section 1.
  • the foamed polymeric article 19 has a substantially uniform consistency across the article and is substantially free of unwanted bubbles.
  • the fourth stage of an alternative embodiment of a method according to the present invention is illustrated in Figure 5.
  • the first mold section 1 corresponds generally to the first mold section 1 shown in Figures 1 to 4, and comprises a mold cavity (no longer visible) and a mold profile 5 having a complex geometry.
  • the second mold section 21 corresponds generally to the second mold section 9 as shown in Figures 1 to 4 it differs therefrom, in that it also comprises a mold cavity (not visible) and a mold profile 23 having a complex surface geometry.
  • a first layer 7 corresponding generally to the first layer used in the method shown in Figures 1 to 4 is applied to the first mold section 1 and a second layer 13 corresponding generally to the second layer 13 used in the method illustrated in Figures 1 to 4 is applied to the second mold section 21.
  • the second layer 13 when the second layer 13 is applied to the second mold section 21 it does not initially protrude into the mold cavity of the second mold section 21 and does not contact the mold profile 23 of the second mold section 21.
  • the displacement of the second layer 13 from the mold profile 23 may be facilitated by use of a retractable pin 15 present in the second mold section 21 ; however, if the second layer 13 is held taut the use of the retractable pin 15 is not necessary, and this may be retained in a retracted position within the second mold section 21.
  • a charge of polymeric material 17 corresponding to the charge of polymeric material 17 discussed with respect to Figures 2 and 3 is applied to the first layer 7, without causing the first layer 7 to substantially protrude into the mold cavity of the first mold section 1.
  • the second layer 13 is then brought into contact with the upper surface of the charge of polymeric material 17 by bringing the second mold section 21 into contact with the first mold section 1. This causes the charge of polymeric material 17 to spread across the surface of the first layer 7 and the second layer 13, so as to substantially cover both surfaces.
  • the foaming of the charge of polymeric material 17 causes the material to expand, so that the first layer 7 protrudes into the mold cavity of the first mold section 1 and comes into close contact with the mold profile 5 of the first mold section 1.
  • the expansion of the polymeric material during foaming also causes the second layer 13 to extend into the mold cavity of the second mold section 21 and to come into close contact with the mold profile 23 of the second mold section 21.
  • foamed polymeric article 25 comprises a foamed polymeric material 17 sandwiched between the first layer 7 and second layer 13 and both the first layer 7 and second layer 13 have complex surface geometries.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

La présente invention concerne des procédés de formation d'objets polymères moussés et des objets produits par ces procédés. En particulier, l'invention concerne un procédé de formation d'un objet polymère moussé comprenant un matériau polymère moussé (17) pris en sandwich entre deux couches (7,13) dans un moule (1,9), le matériau polymère comprenant un agent gonflant chimique, et l'expansion du matériau polymère pendant le moussage provoquant la déformation des couches externes de l'objet de manière à obtenir un bon contact avec les surfaces du moule. La présente invention concerne en outre des objets polymères moussés formés par le procédé de l'invention, présentant une géométrie de surface complexe et/ou une bonne continuité de la mousse.
PCT/GB2016/053458 2015-11-04 2016-11-04 Procédé de formation d'objets polymères moussés WO2017077332A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1809132.2A GB2559926B (en) 2015-11-04 2016-11-04 Method of forming foamed polymeric articles

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GB1519505.0 2015-11-04
GBGB1519505.0A GB201519505D0 (en) 2015-11-04 2015-11-04 Method of forming foamed polymeric articles

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Publication number Priority date Publication date Assignee Title
WO2020164947A1 (fr) * 2019-02-12 2020-08-20 Paltech Procédé de moulage d'articles polymères dotés de noyau en mousse en sandwich
CN114851460A (zh) * 2022-04-25 2022-08-05 蜂巢能源科技股份有限公司 渐变弹性材料及其生产模具和生产方法以及方型电池

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CN113929980B (zh) * 2021-09-29 2023-08-01 东莞一贝核科技有限公司 一种高弹性复合高分子材料及其制备工艺

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US2976577A (en) * 1958-04-14 1961-03-28 Gen Motors Corp Process of making foam cored laminates
JPS4856262A (fr) * 1971-11-17 1973-08-07
US4891081A (en) * 1985-12-04 1990-01-02 Tokai Chemical Industries, Ltd. Method for producing a foamed resin molding
US5186777A (en) * 1989-11-23 1993-02-16 Skis Rossignol S.A. Process for the manufacture of a composite molded structure, and especially of a ski
EP0753389A2 (fr) * 1995-07-14 1997-01-15 MASCHINENFABRIK HENNECKE GmbH Procédé pour la production des articles en mousse de polyuréthane
GB2490734A (en) * 2011-05-13 2012-11-14 Mas Res And Innovation Pvt Ltd Polyurethane foam composition and method of manufacturing a foam article

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Publication number Priority date Publication date Assignee Title
US2976577A (en) * 1958-04-14 1961-03-28 Gen Motors Corp Process of making foam cored laminates
JPS4856262A (fr) * 1971-11-17 1973-08-07
US4891081A (en) * 1985-12-04 1990-01-02 Tokai Chemical Industries, Ltd. Method for producing a foamed resin molding
US5186777A (en) * 1989-11-23 1993-02-16 Skis Rossignol S.A. Process for the manufacture of a composite molded structure, and especially of a ski
EP0753389A2 (fr) * 1995-07-14 1997-01-15 MASCHINENFABRIK HENNECKE GmbH Procédé pour la production des articles en mousse de polyuréthane
GB2490734A (en) * 2011-05-13 2012-11-14 Mas Res And Innovation Pvt Ltd Polyurethane foam composition and method of manufacturing a foam article

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020164947A1 (fr) * 2019-02-12 2020-08-20 Paltech Procédé de moulage d'articles polymères dotés de noyau en mousse en sandwich
US11958218B2 (en) 2019-02-12 2024-04-16 Paltech Process for moulding polymeric foam core sandwich articles
CN114851460A (zh) * 2022-04-25 2022-08-05 蜂巢能源科技股份有限公司 渐变弹性材料及其生产模具和生产方法以及方型电池
CN114851460B (zh) * 2022-04-25 2023-06-20 蜂巢能源科技股份有限公司 渐变弹性材料及其生产模具和生产方法以及方型电池

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GB2559926B (en) 2021-12-08
GB201519505D0 (en) 2015-12-16
GB2559926A (en) 2018-08-22

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