WO2007108024A1 - Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige - Google Patents

Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige Download PDF

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Publication number
WO2007108024A1
WO2007108024A1 PCT/IT2006/000177 IT2006000177W WO2007108024A1 WO 2007108024 A1 WO2007108024 A1 WO 2007108024A1 IT 2006000177 W IT2006000177 W IT 2006000177W WO 2007108024 A1 WO2007108024 A1 WO 2007108024A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
cavity
sole part
sole
toe
Prior art date
Application number
PCT/IT2006/000177
Other languages
English (en)
Inventor
Ettore Bordin
Original Assignee
Stemma S.R.L.
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 Stemma S.R.L. filed Critical Stemma S.R.L.
Priority to EP06745243A priority Critical patent/EP1996393A1/fr
Priority to PCT/IT2006/000177 priority patent/WO2007108024A1/fr
Publication of WO2007108024A1 publication Critical patent/WO2007108024A1/fr

Links

Classifications

    • 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
    • B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
    • B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
    • B29D35/081—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding
    • B29D35/084—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding using exchangeable mould elements
    • 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
    • B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
    • B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
    • B29D35/085—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by compression moulding, vulcanising or the like
    • B29D35/088—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by compression moulding, vulcanising or the like using exchangeable mould elements

Definitions

  • the present invention relates to a process for the production of shoes with a single-layer or multiple-layer sole by means of injection/casting directly onto the upper, and to the means for implementing the process and the shoe obtained thereby.
  • Many known types of shoes with a sole made of synthetic materials usually- used for leisure activities (casual wear, jogging or trekking) and/or as work shoes, may ⁇ be divided into two categories: shoes with a single-layer sole (type 1) or shoes with a multiple-layer sole (type 2).
  • the former which are shown schematically in a mould 100 in Figs. 1 and 2 during and at the end of the moulding process respectively, generally have an upper 102 which is fitted onto a form 101 and intended to be joined to a sole 104 (referred to below as "sole or tread sole").
  • the tread sole 104 is in direct contact in an area 108 with the toe and/or the heel of the upper 102 and may, for functional or aesthetic reasons, project from the sole of the latter.
  • the sole 104 therefore extends and/or covers outer zones at the horizontal end points of the upper 102 and partly surrounds the tip thereof - at the so-called toe end - and/or the heel.
  • the upper 102 is not limited to the sole alone of the shoe.
  • the term “wrap-around” shall be used to describe this feature, while the expression “overlapping area or zone” will be used to describe the part of the upper projecting from its sole or midsole which is covered by the sole or midsole itself.
  • Shoes with a multiple-layer sole may be roughly divided into two subcategories: with a complete midsole (type 2a) or partial midsole (type 2b).
  • a shoe of the type 2a is shown in Fig. 3 inside a mould 200 and has an upper 202 fitted onto a form 201 and enclosed at the bottom by a tread sole 204.
  • a middle piece 206 called a midsole, is situated between the sole 204 and the upper 202 and separates them over the whole surface of the tread sole which is thus never in direct contact with the upper 202.
  • the midsole 206 may also have a wrap-around shape, as can be seen from Fig. 3.
  • a shoe of the type 2b is generally that where the tread sole is, in some zones, in direct contact with the upper without the presence of the midsole.
  • An example of this type of shoe is shown in isolation in Fig. 4 and has an upper 302 underneath which there is a midsole 306 to which a tread sole 304 is attached.
  • the midsole 306 is arranged between upper 302 and tread sole 34, except in an overlapping zone 308 where the tread sole 304 is in direct contact with the upper 302 and in some shoe models, such as that shown, covers part of the toe (or heel) thereof.
  • injection is to be understood as meaning the introduction, via an injection hole, of plastic material in the fluid state inside a closed cavity
  • casting is to be understood as meaning the introduction of plastic material in the fluid state inside an open cavity
  • the upper which is suitably fitted onto a form, is inserted inside an injection/casting cavity 210 and plastic material 400 is introduced inside it, and, solidifying, adheres directly onto the said upper (see, for example, Figs. 1 and 2).
  • the parts of the mould 100 consist of two side shells 120 (only one of which is shown in cross-section) and a base block 122.
  • the two shells 120 are moved towards each other so as to grip the form 101 and the upper 102, following which the material for forming the sole 104 is injected through an injection hole 130 (Fig. 1) onto the block 122.
  • the block 122 is pressed towards the upper 102 so as to cause expansion of the material 400 injected/cast inside the shells
  • the parts of the mould 200 are identical to the case a) and indicated by the same reference numbers.
  • the mould 200 differs owing to the presence of a second injection hole 420 necessary, for example, for injecting the material which forms the midsole 206 after the sole 204 has been cast and obtained, and owing to an additional mould part which acts so as to close the cavities which delimit the first zone to be injected.
  • moulds split into shells are always used, these shells, before injection, being closed around the form+upper assembly or the form+upper+part-already-moulded assembly.
  • the shell-type design of the moulds it is possible not only to provide mould cavities corresponding to the overlapping zones but also extract the moulded article from the undercuts in the mould (after the two shells are separated), -which operation, if performed when the mould is closed, would require forcing which could damage the shoe.
  • the division of the mould into several shells means that the typical lines/scoring created by joining together of the shells are present on the article.
  • the toe end, or alternatively the heel has a transverse scoring line along the plane where the two mould half-shells and an additional block are joined together to form a mould cavity for the overlapping zones.
  • the technical problem solved by the invention is to use the technology of injection, or casting, or spraying directly onto the upper, in order to provide shoes with a wrap-around single-layer or multiple-layer sole, in order to avoid the drawbacks of the known processes.
  • This object is achieved with a production method by means of the injection/casting directly onto the upper of a shoe formed at least by one sole part and an upper, where the former overlaps in an overlapping area the toe and/or the heel of the latter, and the upper is enclosed inside a first mould which grips it at the edges and which defines a first cavity where, once material has been introduced, the sole part is formed, characterized by forming the first mould so that it grips the upper, leaving at least one zone of the toe and/or the heel thereof exposed; providing a second mould in the form of a single-piece (monolithic) block comprising a second mould cavity with which the sole part is formed in the overlapping area; joining the first mould to the second mould in order to form the first cavity and so as to introduce the exposed zone of the upper inside the second cavity.
  • the method may be performed with a machine for producing by means of injection/casting directly onto the upper a shoe formed at least by one sole part and an upper, where the former overlaps in an overlapping area the toe and/or the heel of the latter, comprising a first mould which can be gripped around the edges of the upper and which defines a first cavity for forming the sole part following the introduction of material; a second mould which can be joined to the first mould and co-operates therewith so as to form the first cavity; characterized in that it comprises actuating/driving means for joining the first mould to the second mould by means of a relative rotary/translatory movement.
  • the said machine employs a mould which is characterized in that it is formed so as to grip the edges of the upper, leaving at least one zone of the toe and/or the heel thereof exposed and a mould characterized in that it comprises at least one additional mould cavity for forming the sole part in an area where the sole part and the upper overlap on the toe and/or on the heel of the upper.
  • FIG. 5 to 10 show, schematically, in vertically sectioned views, the sequence of steps of a first process according to the invention for manufacturing shoes of the type 1;
  • FIG. 11 to 17 show schematically, in vertically sectioned views, the sequence of steps for a second process according to the invention for manufacturing shoes of the type 2a;
  • Fig. 5 shows an assembly 30 consisting of an upper 32 of a shoe fitted onto a form 34.
  • the assembly 30 thus provided cooperates with a mould formed with two shells (or half-rings) 36, only one of which is shown in the cross- sections. All these parts, as well as the operations described for the latter and the following processes, are combined and managed by a moulding machine (the details of which are shown in Figures 18 to 21) which controls the movements thereof and the sequence of the various operating steps.
  • Figures 18 to 21 show parts present in Figures 1 to 17 upside down, since according to a possible embodiment of the machine the shoe is formed with the sole directed upwards, in order to assist the operator during the step involving extraction from the shells 36.
  • a machine according to the invention may be designed using parts of known moulding machines, such that only the characteristics components thereof are described and shown, and not details which are certainly known to the person skilled in the art.
  • the two shells 36 from an open position are gripped - position shown in Fig. 18 - around the bottom part of the upper 32 (see also Fig. 5).
  • Fig. 19 the two shells 36 have internally projecting edges 38 which engage with the sides of the upper 32.
  • These edges 38 and the inside of the shells 36 are formed in a known manner, also comprising an introduction hole 42 which allows the introduction of plastic material inside a mould cavity 44.
  • the shells 36 - and this is a characteristic feature of the invention - with the edges 38 do not surround completely the upper 32, but terminate in a zone 39 of the toe 40 of the upper 32, leaving the toe 40 exposed.
  • Fig. 6 shows a following step.
  • a mould cavity 48 is formed in the upper surface of the die 46 and combines with the cavities formed by the edges 38 upon closing of the two shells 36 so as to form an overall cavity 49 (see Fig. 7) inside which plastic material is introduced via the hole 42 and a sole moulded
  • the die 46 consists of a single piece (is monolithic) and comprises in a base block 47 a first mould cavity 48a, which defines the shape of a tread sole, and a second mould cavity 48b, formed in a block 51 projecting from the top of the block 47.
  • the set of cavities 48a and 48b form the cavity 48.
  • arrows F indicate a possible trajectory for joining together the shells 36 and the die 24, the outcome of this movement being essential, namely the introduction of the toe 40 of the upper 32 inside the cavity 48b (see Fig. 7, which shows the position of the parts at the end of the relative movement).
  • a single linear movement would be unable to achieve the inserting movement described, here and below, but a rotary/translatory movement is required, namely a combination of at least one approach movement and at least one rotating movement in order to introduce the toe 40 into the cavity 48b.
  • the plastic material for example polyurethane
  • the hole 42 formed by joining together two opposite half-holes present in each of the two shells 36.
  • the material fills the cavity 49 and forms a tread sole 50 of the shoe (Fig. 8).
  • the finished shoe is shown in Fig. 10, after opening of the shells 36, the extraction of the assembly 30 from the die 46, for example performing a movement which is the reverse of that performed during the joining stage, and after removal of the form 34 from the upper 32.
  • the tread sole 50 has been injected onto the upper 32 and, in addition to forming the tread of the shoe (zone 51 in contact with the sole), extends over a part of the toe 39 of the upper 32 (overlapping area indicated by 53). It is clear that the cavity 48a in conjunction with the cavities 44 of the two shells 36 defines the shape of the tread, while the cavity 48b alone facing the toe 40 defines the extension and the form of the area 53 where upper 32 and tread sole 50 overlap. The process according to the invention, therefore, does not produces marks or scoring due to separation of the shells 36 on the front and visible part of the sole 50, limiting any presence of scoring lines to the side zone alone of the sole and to the rear zone.
  • the base block 47 consists of a single piece and does not have separating lines.
  • a second process is performed as follows. Reference should be made to Figures 11 to 17 and, also, to Figures 17 to 21, in which the same reference numbers are used for parts the same as those already described.
  • An assembly 30 (Fig. 11) consists of an upper 32 fitted onto a form 34.
  • the assembly 30 cooperates with a mould formed with two shells 36.
  • the two shells 36 have edges 38 which are gripped around the bottom part of the upper 32 and now comprise two insertion holes 42, 43 which allow the introduction of plastic material inside a mould cavity 44.
  • edges 38 do not surround completely the upper 32.
  • a base piece 55 (see Fig. 12) is positioned underneath the upper 32 using known actuating means.
  • the upper surface of the base piece 55 has, formed therein, a mould cavity 60 which cooperates with a part of the cavity 44 present in the shells so as to form an overall cavity into which, after the mould parts have been fixed in position, plastic material is introduced by means of injection or casting via the hole 42.
  • the result of this injection/casting operation is shown in Fig. 13.
  • the upper 32 has, associated with it, a midsole 62 which closes off the bottom thereof except for an area 68 at its tip 40, which remains exposed We shall refer to the upper 32 plus the midsole 62 thus obtained as "intermediate piece".
  • the process then envisages that the intermediate piece is gripped between the two shells 36 and the base piece 55 alone is removed, leaving visible the midsole 62.
  • the intermediate piece thus gripped is joined to a mould die 72 for the sole with a relative movement which is similar to that described for the previous process.
  • the die 72 consists of a single piece and comprises in a base block 73 a first mould cavity 74a, which defines the form of a tread sole, and a second mould cavity 74b, which is formed in a block 76 projecting from the top of the block 73.
  • the die 72 must be formed so as to correspond during closing with the two shells 36 and so that the block 73 occupies the volume previously occupied by the base piece 55 so as to define a tread sole 79 and so that the cavity 74b receives the toe 40 of the upper 32.
  • the rotaiy/translatory movement for joining together the intermediate piece and the die 72 may take place for example as indicated by the arrows F in Fig. 14. It is basically necessary to obtain insertion of the toe 40 inside the cavity 74b and joining together of the edges 38 of the shells 36 and the die 72, in particular with the block 73.
  • overall a cavity 81 formed by combining the cavities 74a, 74b with those defined by the edges 38 is obtained in the mould
  • a quantity of material for example dual or multiple-component polyurethane, is then injected into the cavity 81 through the hole 43, so as to form the sole 79.
  • the hole 43 was closed by the base piece 55.
  • Fig. 16 shows the result obtained after injection has been completed
  • the sole 79 in addition to forming the tread of the shoe, extends over part of the toe 40 of the upper 32 (overlapping area indicated by 53 in Fig. 16).
  • the cavity 74a and the edges 38 cooperate to define the form of the tread, while the cavity 74b defines the extension and the form of the area 53 where the upper 32 and the sole 79 overlap. In this case also the process does not produces any marks or scoring on the tread sole. It is clear that in the two processes the relative movement for joining together and coupling the dies 46, 72 and the assembly formed by form 30 + upper 32 + closed shells 36, plus if necessary the injected midsole 62, may occur equally well by moving both or only one of them relative to the other one. The convenience will be determined by practical requirements relating to design of the moulding machine. However, manual operation during the various steps, as well as different division of the shoe mould into shells or parts which can be joined together, are also possible.
  • Figures 20 and 21 show a possible embodiment of a part of a moulding machine according to the invention, in particular the mechanism which obtains the described relative movement of the upper 32 and the die 46 used in the first process. All this which has now been described is also applicable to the second process where the die 72 is employed
  • the two shells 36 are arranged between two gripping surfaces 85 which grip them where required.
  • the die 46 is arranged between the two shells 36 and is connected to a fixed upper cross-piece 87 by means of an actuating means mechanism 99 comprising a toggle 89 formed by two identical pairs of segments 90, 91 hinged with pins 93, and a pair of identical straight bars 94 hinged by means of other pins 93.
  • the common hinge of the segments 90, 91 is connected to a piston 95 which is operated in a linear manner by an actuating system 96, while the mechanism 99 is hinged on the die 46 by means of a bracket 97.
  • the operating principle of the machine is as follows.
  • the cross-piece 87 is displaced towards the shells 36 in the direction Dl shown in Fig. 20 using known actuating means until the die 46 is arranged inside the said shells 36 (Fig. 20).
  • the piston 95 is extended and tends to push the toggle 89.
  • the die 46 is inclined with respect to a horizontal plane, and its cavity 48b is not yet in contact with the upper 32, but instead faces its toe end 40 at a certain distance.
  • the actuating system 96 is then operated so as to retract the piston 95

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

L'invention concerne un procédé de production, au moyen d'une injection / d'un moulage direct sur une tige (32), d'une chaussure formée au moins par une partie (50 ; 79) de semelle et une tige (32), la première recouvrant, dans une zone (53) de recouvrement, le bout (40) et / ou le talon de la seconde. La tige (32) est enfermée dans un premier moule (36) qui la serre au niveau des bords, laissant au moins une zone (39) du bout (40) et / ou du talon de celle-ci exposée, et qui définit une première cavité (49 ; 81) où la semelle est formée. Un deuxième moule (46 ; 72) sous la forme d'un bloc d'un seul tenant comportant une deuxième cavité (48, 74a, 74b) est couplé au premier moule (36) de façon à former la première cavité (49 ; 81) et à introduire la zone exposée (39) de la tige (32) dans la deuxième cavité (48, 74a, 74b). L'invention concerne également un moule et une machine ainsi que les chaussures qui peuvent être fabriquées à l'aide de ceux-ci.
PCT/IT2006/000177 2006-03-22 2006-03-22 Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige WO2007108024A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06745243A EP1996393A1 (fr) 2006-03-22 2006-03-22 Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige
PCT/IT2006/000177 WO2007108024A1 (fr) 2006-03-22 2006-03-22 Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000177 WO2007108024A1 (fr) 2006-03-22 2006-03-22 Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige

Publications (1)

Publication Number Publication Date
WO2007108024A1 true WO2007108024A1 (fr) 2007-09-27

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PCT/IT2006/000177 WO2007108024A1 (fr) 2006-03-22 2006-03-22 Procede de fabrication d'une chaussure par injection / moulage d'une semelle monocouche ou multicouche en materiau synthetique directement sur la tige

Country Status (2)

Country Link
EP (1) EP1996393A1 (fr)
WO (1) WO2007108024A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011054509A1 (fr) * 2009-11-06 2011-05-12 Ecco Sko A/S Procédé et insert pour fabriquer une semelle de chaussure à densités multiples
EP2435240A1 (fr) * 2009-05-25 2012-04-04 Siili Safety S.R.L. Procédé de fabrication d'une chaussure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1422897A (fr) * 1964-09-15 1966-01-03 Desma Werke Gmbh Moule pour couler sous pression, notamment sur des empeignes de soulier, une semelle comprenant plusieurs couches de matière élastique
GB1191334A (en) * 1967-07-24 1970-05-13 British Bata Shoe Co Ltd Injection Moulding Apparatus
GB1268935A (en) * 1968-03-19 1972-03-29 British Bata Shoe Co Ltd Injection molding
DE4115048C1 (en) * 1991-05-08 1992-09-24 Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De Moulding plastic boots - in which central male mould and two hinged female moulds are used, enabling a simple and economic mfr. of boots which have good thermal insulation
WO2000029204A1 (fr) * 1998-11-13 2000-05-25 Main Group S.P.A. Support de moule destine aux moules servant a la fabrication de bottes ou d'articles similaires en plastique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1422897A (fr) * 1964-09-15 1966-01-03 Desma Werke Gmbh Moule pour couler sous pression, notamment sur des empeignes de soulier, une semelle comprenant plusieurs couches de matière élastique
GB1191334A (en) * 1967-07-24 1970-05-13 British Bata Shoe Co Ltd Injection Moulding Apparatus
GB1268935A (en) * 1968-03-19 1972-03-29 British Bata Shoe Co Ltd Injection molding
DE4115048C1 (en) * 1991-05-08 1992-09-24 Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De Moulding plastic boots - in which central male mould and two hinged female moulds are used, enabling a simple and economic mfr. of boots which have good thermal insulation
WO2000029204A1 (fr) * 1998-11-13 2000-05-25 Main Group S.P.A. Support de moule destine aux moules servant a la fabrication de bottes ou d'articles similaires en plastique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2435240A1 (fr) * 2009-05-25 2012-04-04 Siili Safety S.R.L. Procédé de fabrication d'une chaussure
WO2011054509A1 (fr) * 2009-11-06 2011-05-12 Ecco Sko A/S Procédé et insert pour fabriquer une semelle de chaussure à densités multiples
US9283724B2 (en) 2009-11-06 2016-03-15 Ecco Sko A/S Method and insert for manufacturing a multi-density shoe sole

Also Published As

Publication number Publication date
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