WO2002085598A1 - Moulding process for foamed polyurethane soles - Google Patents

Moulding process for foamed polyurethane soles Download PDF

Info

Publication number
WO2002085598A1
WO2002085598A1 PCT/IT2002/000250 IT0200250W WO02085598A1 WO 2002085598 A1 WO2002085598 A1 WO 2002085598A1 IT 0200250 W IT0200250 W IT 0200250W WO 02085598 A1 WO02085598 A1 WO 02085598A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
sheet
polyurethane
holes
foamed polyurethane
Prior art date
Application number
PCT/IT2002/000250
Other languages
French (fr)
Inventor
Giampietro Ruggeri
Original Assignee
Rpm Sud S.P.A.
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 Rpm Sud S.P.A. filed Critical Rpm Sud S.P.A.
Publication of WO2002085598A1 publication Critical patent/WO2002085598A1/en

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
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/122—Soles
    • 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
    • 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
    • B29C44/145—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining the lining being a laminate
    • 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
    • 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
    • B29C44/146—Shaping the lining before foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
    • B29D35/128—Moulds or apparatus therefor

Definitions

  • the present patent application relates to a moulding process for foamed polyurethane soles and to the soles obtained with the same process.
  • foamed polyurethane for sole moulding is very common since the physical and mechanical characteristics of this material are very suitable to the specifications requested for this type of articles.
  • the low specific weight of foamed polyurethane allows for obtaining light soles, also in the case of very thick models, such as the wedge soles that are commonly used for women's footwear.
  • polyurethane is poured in the bottom of the cavity of the matrix die of the mould, which is then closed and maintained closed until polyurethane has completely expanded and the part has solidified and cooled.
  • Rotating platforms known as “casting wheels” are normally used for production of large series of articles.
  • An annular series of moulds is placed on the perimeter of the platform and then opened and closed automatically by suitable actuators.
  • Three operating stations are installed on the casting wheel at the correct distance: - a first station provided with means for the automatic application of the releasing substance on the internal walls of the open mould;
  • the moulded part is first washed to remove possible stains of the releasing substance from its walls and then painted.
  • soles with multi-layer structure comprising a foamed polyurethane moulded body and a moulded bottom made of rubber or any other material with good anti- wear and anti-slip properties. Being realised through the assembling of different layers, each of them moulded with a different material, these bottoms are impaired by a complex and expensive production process.
  • the purpose of the invention is to devise a moulding process for foamed polyurethane soles, characterised by the fact that polyurethane is poured in a thin shell that has been previously thermoformed in order to have exactly the same shape of the internal impression of the mould; it being also provided that the material has a high coefficient of elasticity and is compatible with polyurethane, meaning that it can physically and/or chemically "bind" with the polyurethane casting, in order to form a monolithic sole characterised by the fact that it presents a surface layer of material with good anti-wear and anti-slip properties on the lower and lateral surface.
  • a thin sheet of polyurethane- compatible material with good anti-wear and anti-slip properties is laid and tightened between the mould and the matrix die.
  • the air temperature must cause the softening of the sheet that, because of the air pressure, stretches against the bottom and walls of the matrix die, thus perfectly adhering to its profile.
  • the shell before pouring the polyurethane, the shell must be heated again, for example by means of infrared lamps, in order to bring it to a physical state that is close to fusion and favours the best and most complete "welding" between the polyurethane casting and the shell.
  • the sheet can be continuously supplied from a roll located near the mould and automatically cut with suitable size.
  • - figures 1 to 8 show the different operating phases of the moulding process of the invention aimed to obtain a sole with homogeneous colour and surface finish both on tread and side; - figures 9 to 18 show the different operating phases of the moulding process of the invention aimed to obtain a sole with two surfaces of different finish or colour.
  • the figures show the mould and the moulded sole sectioned with a transversal vertical plane.
  • the process of the invention in its simplest implementation mode makes use of an ordinary mould for foamed polyurethane soles, with the only characteristic that it has one or more holes (1a and 2a) respectively on the cover (1) and the matrix die (2), used to introduce or extract air in/from the internal cavity of the mould.
  • the sequence of the moulding cycle is as follows:
  • the sole (S) obtained with the process of the invention is characterised by the fact that it has a monolithic structure formed by a moulded foamed polyurethane body (100) having a surface layer (101) of different material with good anti-wear and anti-slip properties on the lower and lateral surface.
  • a sole with two colours or two different surface finishes can be obtained by using a mould that comprises a ring (3) provided with holes (3a) for the passage of air placed between the cover (1) and the matrix die (2), as shown in the second group of figures from 9 to 18.
  • the sequence of the moulding cycle is as follows:
  • the sole (S1) obtained with the process of the invention is characterised by the fact that it has a monolithic structure formed by a moulded foamed polyurethane body (100) contained in a shell (G1) with two different surface finishes.
  • the tread of the sole (S1) has the finish of the first sheet (F1), with a separation line (D) on the lateral sides between two overlapped bands, of which the upper band has the finish of the second sheet (F2) and the lower band has the finish of the first sheet (F1).
  • letter (L) indicates the borders of the sheets (F or F1 or F2) that must be cut. Cutting can be carried out after the part has been extracted or when the part is still contained in the mould. In the latter case, the mould must be provided with an ordinary cutting device.
  • the heating, with the mould open, of the shells (G or G1) can be carried out by means of infrared lamps (I) or with any other suitable source of heat.
  • the sheets (F, F1 and F2) are made of a material having a high coefficient of elasticity (percentage ultimate elongation higher than 500%), good anti-wear and anti-slip properties, which is compatible with foamed polyurethane, meaning that it can physically and/or chemically bind with polyurethane.
  • the sheets (F, F1 and F2) can be, for example, of thermoplastic polyurethane with thickness ranging from a few tens of micron (such as in the case of the sheet F2 located on the sides of the sole) to a few tens of millimetre (such in the case of the sheet F1 located on the tread of the sole).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

The present invention relates to a moulding process for foamed polyurethane soles, according to which polyurethane is poured inside a thermoformed shell obtained from a sheet of foamed polyurethane compatible material that is thermoformed inside the mould by means of hot air.

Description

DESCRIPTION
Moulding process for foamed polyurethane soles
The present patent application relates to a moulding process for foamed polyurethane soles and to the soles obtained with the same process.
The use of foamed polyurethane for sole moulding is very common since the physical and mechanical characteristics of this material are very suitable to the specifications requested for this type of articles.
First of all, the low specific weight of foamed polyurethane allows for obtaining light soles, also in the case of very thick models, such as the wedge soles that are commonly used for women's footwear.
Another factor that has contributed to the success of foamed polyurethane in the production of footwear bottoms is represented by the fact that it offers good anti-slip properties and soft soles.
Last, but not least, it must be noted that the moulding process of foamed polyurethane is simple and inexpensive.
According to this process, polyurethane is poured in the bottom of the cavity of the matrix die of the mould, which is then closed and maintained closed until polyurethane has completely expanded and the part has solidified and cooled.
In order to facilitate the extraction of the part, without damaging the finish of the external walls, before pouring polyurethane, it is necessary to spray or spread a layer of "releasing" substance on the internal surface of the mould, in order to prevent polyurethane from adhering to the walls of the matrix die and to the mould cover.
Rotating platforms known as "casting wheels" are normally used for production of large series of articles. An annular series of moulds is placed on the perimeter of the platform and then opened and closed automatically by suitable actuators.
Three operating stations are installed on the casting wheel at the correct distance: - a first station provided with means for the automatic application of the releasing substance on the internal walls of the open mould;
- a second station downstream provided with means for the automatic pouring of polyurethane in the cavity of the mould, whose cover is closed once casting has been completed;
- a third, last station placed at the correct distance from the second station and provided with means for the automatic opening of the mould from which the part is extracted, once solidification and cooling have been completed. In any case, the moulded part is first washed to remove possible stains of the releasing substance from its walls and then painted.
It must be said, however, that although low density foamed polyurethane can guarantee lightness and softness, it does not offer sufficient mechanical resistance to abrasion, being this property extremely important to prevent rapid wear of the sole heel and tread.
In view of the above limitations, soles with multi-layer structure have been devised and realised, comprising a foamed polyurethane moulded body and a moulded bottom made of rubber or any other material with good anti- wear and anti-slip properties. Being realised through the assembling of different layers, each of them moulded with a different material, these bottoms are impaired by a complex and expensive production process.
The purpose of the invention is to devise a moulding process for foamed polyurethane soles, characterised by the fact that polyurethane is poured in a thin shell that has been previously thermoformed in order to have exactly the same shape of the internal impression of the mould; it being also provided that the material has a high coefficient of elasticity and is compatible with polyurethane, meaning that it can physically and/or chemically "bind" with the polyurethane casting, in order to form a monolithic sole characterised by the fact that it presents a surface layer of material with good anti-wear and anti-slip properties on the lower and lateral surface.
According to the process of the invention a thin sheet of polyurethane- compatible material with good anti-wear and anti-slip properties is laid and tightened between the mould and the matrix die.
Once the mould has been closed, the air contained in the internal cavity is extracted completely, extracting it both above and below the thin sheet tightened between the matrix die and cover.
Should air be extracted from below only, the sheet would tend to adhere against the internal walls of the matrix die, with the risk of occluding the extraction holes located on the internal walls of the impression before the air is completely extracted. Once vacuum has been created above and below the sheet tightened between the matrix die and the cover, hot pressurised air is gradually introduced in the space above the sheet.
It must be noted that the air temperature must cause the softening of the sheet that, because of the air pressure, stretches against the bottom and walls of the matrix die, thus perfectly adhering to its profile.
In other words, it can be said that the combined action of high temperature and the high pressure of the air that is gradually introduced in the mould results in the progressive thermoforming of the sheet, which takes the shape of a shell perfectly adhering to the internal walls of the impression of the matrix die of the mould.
Then the hot air is discharged and the mould is opened in order to pour polyurethane in the shell.
It must be said, however, that before pouring the polyurethane, the shell must be heated again, for example by means of infrared lamps, in order to bring it to a physical state that is close to fusion and favours the best and most complete "welding" between the polyurethane casting and the shell.
The sole obtained with the process of the invention does not need to be washed or painted, since the external surface has the colour and surface finish of the aforementioned sheet. To this end it must be noted that the painting of the sheet, by means of silk-screening or holography processes, permits to reproduce the surface finish of any material, such as wood, cork, leather, marble, materials that are often imitated in foamed polyurethane bottoms, with very low costs and high accuracy.
By using a sheet of transparent material and painting it on its upper side, that is the side that remains inside the shell, it will be possible to preserve the initial colour and surface finish of the sole over time, since natural wear caused by abrasion will affect the external side of the sheet.
The sheet can be continuously supplied from a roll located near the mould and automatically cut with suitable size.
For major clarity the description of the invention continues with reference to the enclosed drawings, which are intended for purposes of illustration and not in a limiting sense, whereby:
- figures 1 to 8 show the different operating phases of the moulding process of the invention aimed to obtain a sole with homogeneous colour and surface finish both on tread and side; - figures 9 to 18 show the different operating phases of the moulding process of the invention aimed to obtain a sole with two surfaces of different finish or colour.
It must be noted that the figures show the mould and the moulded sole sectioned with a transversal vertical plane. With reference to figures 1 to 8, the process of the invention in its simplest implementation mode makes use of an ordinary mould for foamed polyurethane soles, with the only characteristic that it has one or more holes (1a and 2a) respectively on the cover (1) and the matrix die (2), used to introduce or extract air in/from the internal cavity of the mould. The sequence of the moulding cycle is as follows:
- laying of a thin flexible sheet (F) on the matrix die (2) to close the opening of the impression (2b) of the matrix die (2), as shown in fig. 1 ;
- closing of the mould with tightening of the sheet (F) between the cover (1 ) and the matrix die (2), as shown in fig. 2; - extraction of the air contained in the cavity of the mould through the holes (1a and 2a), as shown in fig. 3;
- suspension of air extraction through the holes (2a) and gradual introduction of hot pressurised air into the mould through the holes (1a) in order to soften the sheet (F) and thermoform it with the shape of a shell (G) that perfectly adheres to the walls of the impression (2b), as shown in fig. 4;
- discharge of hot air through the holes (1a), as shown in fig. 5; - possible heating, with the mould open, of the shell (G) to maintain it at a temperature value close to fusion, as shown in fig. 6;
- pouring of polyurethane (P) into the shell (G) and closing of the mould, as shown in fig. 7;
- extraction of the part, once solidification and cooling of the foamed polyurethane have been completed, as shown in fig. 8.
The sole (S) obtained with the process of the invention is characterised by the fact that it has a monolithic structure formed by a moulded foamed polyurethane body (100) having a surface layer (101) of different material with good anti-wear and anti-slip properties on the lower and lateral surface. A sole with two colours or two different surface finishes (such as false rubber tread and false wooden side) can be obtained by using a mould that comprises a ring (3) provided with holes (3a) for the passage of air placed between the cover (1) and the matrix die (2), as shown in the second group of figures from 9 to 18. In this case the sequence of the moulding cycle is as follows:
- laying of a first thin flexible sheet (F1) on the matrix die (2) to close the opening of the impression (2b) of the matrix die (2), as shown in fig. 9;
- tightening of the sheet (F1) between the matrix die (2) and the ring (3), as shown in fig. 10; - laying of a second thin flexible sheet (F2) with different finish compared to the sheet (F1) on the ring (3), as shown in fig. 11 ;
- closing of the mould with tightening of the sheet (F2) between the cover (1) and the ring (3), as shown in fig. 12;
- extraction of the air contained in the cavity of the mould through the holes (1a, 2a and 3a), as shown in fig. 13;
- suspension of air extraction through the holes (2a and 3a) and gradual introduction of hot pressurised air into the mould through the holes (1 a) in order to soften the sheets (F1 and F2) and thermoform them simultaneously with the shape of a shell (G1) that perfectly adheres to the walls of the impression (2b), as shown in fig. 14;
- discharge of hot air through the holes (1a), as shown in fig. 15; - possible heating, with the mould open, of the shell (G1) to maintain it at a temperature value close to fusion, as shown in fig. 16;
- pouring of polyurethane (P) into the shell (G1) and closing of the mould, as shown in fig. 17;
- extraction of the part, once solidification and cooling of the foamed polyurethane have been completed, as shown in fig. 18.
The sole (S1) obtained with the process of the invention is characterised by the fact that it has a monolithic structure formed by a moulded foamed polyurethane body (100) contained in a shell (G1) with two different surface finishes. The tread of the sole (S1) has the finish of the first sheet (F1), with a separation line (D) on the lateral sides between two overlapped bands, of which the upper band has the finish of the second sheet (F2) and the lower band has the finish of the first sheet (F1).
In figures from 8 to 18 letter (L) indicates the borders of the sheets (F or F1 or F2) that must be cut. Cutting can be carried out after the part has been extracted or when the part is still contained in the mould. In the latter case, the mould must be provided with an ordinary cutting device.
The heating, with the mould open, of the shells (G or G1) can be carried out by means of infrared lamps (I) or with any other suitable source of heat.
According to the process of the invention the sheets (F, F1 and F2) are made of a material having a high coefficient of elasticity (percentage ultimate elongation higher than 500%), good anti-wear and anti-slip properties, which is compatible with foamed polyurethane, meaning that it can physically and/or chemically bind with polyurethane.
The sheets (F, F1 and F2) can be, for example, of thermoplastic polyurethane with thickness ranging from a few tens of micron (such as in the case of the sheet F2 located on the sides of the sole) to a few tens of millimetre (such in the case of the sheet F1 located on the tread of the sole).

Claims

Claims
1) Moulding process for foamed polyurethane soles, characterised by the fact it comprises the following operating cycle:
- laying of a thin flexible sheet (F) on the matrix die (2) to close the opening of the impression (2b) of the matrix die(2); - closing of the mould with tightening of the sheet (F) between the cover (1) and the matrix (2) die of the mould;
- extraction of the air contained in the cavity of the mould through the holes (1a and 2a) located on the cover (1) and the matrix die (2);
- suspension of air extraction through the holes (2a) and gradual introduction of hot pressurised air into the mould through the holes (1a) in order to soften the sheet (F) and thermoform it with the shape of a shell (G), which perfectly adheres to the walls of the impression (2b);
- discharge of hot air through the holes (1a);
- possible heating, with the mould open, of the shell (G) to maintain it at a temperature value close to fusion;
- pouring of polyurethane (P) in the shell (G) and closing of the mould;
- extraction and trimming of the part, once solidification and cooling of the foamed polyurethane have been completed; it being provided that the sheet (F) is made of a material having a high coefficient of elasticity, good anti-wear and anti-slip properties, which is compatible with foamed polyurethane, meaning that it can physically and/or chemically bind with polyurethane.
2) Moulding process for foamed polyurethane soles, characterised by the fact it comprises the following operating cycle: - laying of a first thin flexible sheet (F1) on the matrix die (2) of the mould to close the opening of the impression (2b) of the matrix die(2);
- tightening of the sheet (F1) between the matrix die (2) and the ring (3) located between the matrix die (2) and the cover (1);
- laying of a second thin flexible sheet (F2) with different finish compared to the sheet (F1) on the ring (3); - closing of the mould with tightening of the sheet (F2) between the cover (1) and the ring (3);
- extraction of the air contained in the cavity of the mould through the holes (1a, 2a and 3a), respectively located on the cover (1), the matrix die (2) and the ring (3);
- suspension of air extraction through the holes (2a and 3a) and gradual introduction of hot pressurised air into the mould through the holes (1a) in order to soften the sheets (F1 and F2) and overlap them, and then thermoform them simultaneously with the shape of a shell (G1), which perfectly adheres to the walls of the impression (2b);
- discharge of hot air through the holes (1a);
- possible heating, with the mould open, of the shell (G1 ) to maintain it at a temperature value close to fusion;
- pouring of polyurethane (P) in the shell (G1) and closing of the mould; - extraction and trimming of the part, once solidification and cooling of the foamed polyurethane have been completed; it being provided that the sheets (F1 and F2) are made of a material having a high coefficient of elasticity, good anti-wear and anti-slip properties, which is compatible with foamed polyurethane, meaning that it can physically and/or chemically bind with polyurethane. •
3) Process according to the previous claims, characterised by the fact that the heating, with the mould open, of the shells (G or -G1) is carried out by means of infrared lamps (I).
4) Process according to claims 1 and 2, characterised by the fact that trimming, which consists in cutting the borders (L) of the sheets (F or F1 or
F2), is carried out after extracting the part.
5) Process according to claims 1 and 2, characterised by the fact that trimming, which consists in cutting the borders (L) of the sheets (F or F1 or F2), is carried out when the part is still in the mould, which is provided with an ordinary cutting device.
6) Process according to claims 1 and 2, characterised by the fact that the sheets (F or F1 or F2) are made of thermoplastic polyurethane having a percentage ultimate elongation higher than 500%.
7) Foamed polyurethane moulded sole obtained with the process according to the previous claims.
PCT/IT2002/000250 2001-04-23 2002-04-19 Moulding process for foamed polyurethane soles WO2002085598A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN2001A000019 2001-04-23
IT2001AN000019A ITAN20010019A1 (en) 2001-04-23 2001-04-23 PROCESS FOR THE MOLDING OF FOAMS IN EXPANDED POLYURETHANE

Publications (1)

Publication Number Publication Date
WO2002085598A1 true WO2002085598A1 (en) 2002-10-31

Family

ID=11437305

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2002/000250 WO2002085598A1 (en) 2001-04-23 2002-04-19 Moulding process for foamed polyurethane soles

Country Status (2)

Country Link
IT (1) ITAN20010019A1 (en)
WO (1) WO2002085598A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010001981B4 (en) * 2009-05-14 2016-10-27 Dong-gun Lee Process for the preparation of a polyurethane coated spandex fabric fused midsole and midsole produced by the process
IT201900018407A1 (en) * 2019-10-10 2021-04-10 Pu Ro S R L Process of molding a double-layer sole, mold used and product directly obtained.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873407A (en) * 1971-12-18 1975-03-25 Sanyo Chemical Ind Ltd Skin polyurethane foam
DE2401034A1 (en) * 1974-01-10 1975-07-31 Harvey Eisenberg Foamed article with thermoplastic skin - produced by vacuum forming skin and fusing foam in closed two part mould
DE3506230C1 (en) * 1985-02-22 1986-07-17 Grammer Sitzsysteme GmbH, 8450 Amberg Process for producing seat or backrest upholstery
EP0650822A2 (en) * 1993-10-29 1995-05-03 Toyota Jidosha Kabushiki Kaisha A method of forming a product integrally with a surface layer and the product itself
US6007748A (en) * 1997-10-16 1999-12-28 Krajcir; Dezi Anthony Production of molded laminated articles, particularly soles for footwear

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873407A (en) * 1971-12-18 1975-03-25 Sanyo Chemical Ind Ltd Skin polyurethane foam
DE2401034A1 (en) * 1974-01-10 1975-07-31 Harvey Eisenberg Foamed article with thermoplastic skin - produced by vacuum forming skin and fusing foam in closed two part mould
DE3506230C1 (en) * 1985-02-22 1986-07-17 Grammer Sitzsysteme GmbH, 8450 Amberg Process for producing seat or backrest upholstery
EP0650822A2 (en) * 1993-10-29 1995-05-03 Toyota Jidosha Kabushiki Kaisha A method of forming a product integrally with a surface layer and the product itself
US6007748A (en) * 1997-10-16 1999-12-28 Krajcir; Dezi Anthony Production of molded laminated articles, particularly soles for footwear

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010001981B4 (en) * 2009-05-14 2016-10-27 Dong-gun Lee Process for the preparation of a polyurethane coated spandex fabric fused midsole and midsole produced by the process
IT201900018407A1 (en) * 2019-10-10 2021-04-10 Pu Ro S R L Process of molding a double-layer sole, mold used and product directly obtained.

Also Published As

Publication number Publication date
ITAN20010019A0 (en) 2001-04-23
ITAN20010019A1 (en) 2002-10-23

Similar Documents

Publication Publication Date Title
US2670501A (en) Method of forming plastic material
US20060105650A1 (en) Foam product having outer skin and method for producing the same
CN107373881B (en) Film-covered formed secondary MD shoe material and production process thereof
JPH05293839A (en) Method for slush molding articles of two or more colors such as artificial leather products from thermoplastic, thermosetting or elastomeric resins in power form, apparatus for practicing this method and articles by practice of this method
CZ291804B6 (en) Injection molding process for soles from expandable, crosslinking
CN110494277B (en) Process for manufacturing a multi-layer sole directly on an upper and machine operating with said process
CN107867033A (en) Method and apparatus for nonwoven decoration panel
CN109093908A (en) Mold and sole coating method for sole coating
CA2364589C (en) Method for making a shoe
WO2002085598A1 (en) Moulding process for foamed polyurethane soles
US8944795B2 (en) Mold release sheet
CZ293370B6 (en) Method for forming products such as leather fabric
CA3085270C (en) Process for making seats with additional gel padding, seat obtained therewith and equipment for implementing said process
US4069000A (en) Mold for shaping and curing reinforced plastic material
US2140692A (en) Method for manufacturing molded rubber articles
CN107972221B (en) A kind of two-color dual-density foaming forming technique
CN110891852A (en) Mould for a support element for a human body, such as a saddle
US3113830A (en) Manufacturing process for shoes of polymerizing elastomers
US3545105A (en) Ski boot
CN114571769B (en) Product forming method, product and shoe
WO2022116580A1 (en) Product forming method, product, and shoe
TWI823243B (en) Method for manufacturing one-piece waterproof vamp
JP2000210968A (en) Skinned in-mold foamed molded object and production thereof
JP3220935B2 (en) Manufacturing method of plastic heel with leather grain mark
CA2094644C (en) Method and apparatus for injection moulding rubber soles having at least two layers

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP