CA2234838A1 - Method for manufacturing shoes - Google Patents
Method for manufacturing shoes Download PDFInfo
- Publication number
- CA2234838A1 CA2234838A1 CA 2234838 CA2234838A CA2234838A1 CA 2234838 A1 CA2234838 A1 CA 2234838A1 CA 2234838 CA2234838 CA 2234838 CA 2234838 A CA2234838 A CA 2234838A CA 2234838 A1 CA2234838 A1 CA 2234838A1
- Authority
- CA
- Canada
- Prior art keywords
- sole
- felt piece
- last
- displacer
- piece
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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
- B29D35/082—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 injecting first the outer sole part
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
With a method for manufacturing shoes in which a two-layer sole is sprayed onto a shoe shaft drawn on a last and the outer sole is sprayed first and then the intermediate sole, it is provided according to the invention that, prior to spraying the outer sole, a synthetic fiber felt piece is placed against the area of a displacer which is contact with the form and electrostatically charged, as a result of which the felt piece is pressed against the metal displacer and adheres to it, that the displacer seals the injection mold consisting of shaped side parts and base stamp with the adhering felt piece, that the thus resultant mold cavity is filled with elastomer material, that when the base stamp travels upward the elastomer material is pressed together and elastomer material penetrates into the felt piece, and that it is replaced by the last covered with the shaft, in such a way that a mold cavity remains for the intermediate sole between last and outer sole, after which this mold cavity is filled with a synthetic material, whereby this material forming the intermediate sole connects with the felt piece and the shaft and that, finally, the mold is opened and the finished shoe removed from the last.
Description
Klockner Desma Schuhmaschinen GmbH
Desmastr. 3/5, D-28832 Achim Nethod for Manufacturing Shoes The invention concerns a method for manufacturing shoes, in which a two-layer sole is sprayed onto a shoe shaft drawn on a last and that the outer sole is sprayed first and then the intermediate sole.
Methods of this type are usually carried out on so-called round table installations in which a plurality of forming stations are arranged radially on the rotatable round table. The forming stations consist of a base stamp which can travel up and down, has at least two shaped side parts which, together with the base stamp, form a mold cavity that is sealed at the top by superimposing a displacer or last.
To shape the outer sole, the mold cavity is first sealed with the displacer. After the forming station has travelled into the area of the spraying station, the nozzle of the injection unit adjoins the sprue runner and sprays the material for the outer sole. The displacer is then driven out of the molding tool. The last covered with the shoe shaft assumes its position. A space remains between the outer sole sprayed in the first step and the underside of the last. The material for the intermediate sole is now sprayed into this space by means of a further injection unit. Intermediate sole and outer sole connect to one another and also the intermediate sole and the shoe shaft drawn onto the last.
Advantageously, the outer sole is made of a non-abrasive material, while the intermediate sole, having regard to a cushioning effect, consists of a flexible material to improve foot comfort.
Due to the difference in the two materials, it does occur that the two materials do not connected sufficiently firmly with one another during sprayion of the intermediate sole. As a result, precautionary measures are taken to make the contact surface between the two materials such that an intimate connecton between the two layers can take place.
According to the method of the invention, a synthetic fiber felt piece, corresponding to the shape of the sole, is inserted for this purpose between outer sole and intermediate sole. When spraying both the outer sole and also during the subsequent spraying of the intermediate sole, both materials penetrate into the felt. When the base stamp travels upward, both the outer sole and the intermediate sole are pressed together so that the material connection between intermediate sole, cut felt piece and outer sole becomes even more intimate.
Thusfar, after the outer sole has been sprayed and the displacer driven out, the felt piece is placed onto the shaped outer sole, after which the space provided for the intermediate sole is formed by superimposing the last. This method is time-consuming which also results therein that, due to the outer sole material hardening, a connection thereof with the felt cut can no longer take place satisfactorily.
Thus, it is the object of the invention to conduct a method of the aforementioned type in such a way that a connection of the outer sole material with the synthetic fiber felt piece or a similar material can already take place during spraying of the outer sole.
The invention solves this object thereby that, prior to spraying the outer sole, a synthetic fiber felt piece is placed on the area of a displacer which is in contact with the form and loaded electrostatically, as a result of which the felt piece is pressed against the metal displacer and adheres to it, the displacer seals the injection mold consisting of the shaped side parts and base stamp with the adhering felt piece, the resultant mold cavity is filled with elastomer material, that, when the base stamp travels upward, the elastomer material is pressed together and elastomer material penetrates into the felt piece, the displacer is driven out of the shaping tool, and replaced by the last covered with the shaft, in such a way that a mold cavity for the intermediate sole remains between last and outer sole, after which this cavity is filled with a synthetic material, whereby this material forming the intermediate sole connects with the felt piece and the shaft and that, finally, the mold is opened and the finished shoe removed from the last.
In this way, it is possible to fasten the felt piece securely to the displacer until the latter has sealed the mold cavity and the cavity is filled with the elastomer material. It was found that the electrostatic adhesion between felt piece and displacer, on the one hand, produces a secure hold of the felt piece on the displacer and in this way, on the other hand, ensures that the felt piece is situated correctly in the shaping tool.
According to a preferred embodiment of the method, the electrostatic charge is accomplished by an ionized air current directed to the cut piece.
In an especially simple embodiment, a conventional, manually operated paint gun, which acts on an electrostatic basis, provides for the ionized air current. The person operating the machine holds the felt piece against the underside of the displacer, directs the ionized air current from the paint gun onto said piece, whereby the latter is, on the one hand, pressed against the displacer due to air pressure and, on the other hand, electrostatically charged. Paint gun and injection-molding machine are thereby grounded, so that the electrostatic attraction unfolds fully and, on the other hand, that there is no danger to the person operating the machine.
In a further embodiment of the method, it can be provided that the cut piece is electrostatically charged directly, for example, by point electrodes.
A somewhat more expensive manner of carrying out the process is given by the features of claim 8. In this case, the felt piece is driven fully automatically by a handling device (robot) in front of a displacer. The modified paint gun is located on the handling device and is controlled in such a way that it is activated when the felt piece has reached its position. In this way, it is ensured that the person operating the machine does not have to reach into the forming station area. Moreover, this results in increased pulse numbers. Instead of the paint gun, an electrode arrangement can also be placed on the handling device, by means of which the felt piece is directly charged electrostatically.
According to claim 4, it is provided that the synthetic fiber felt forms a thin intermediate layer which is, moreover, fully impregnated by the two synthetic materials and can scarcely be noticed visually in the finished shoe.
The thickness of the cut piece is, for example, 1 to 1.3 mm. In this case, polyester can be selected as a material.
Rubber, which is especially abrasion-proof, is chosen as a material for the outer sole while polyurethane, which gives the finished shoe the desired foot comfort, is chosen for the intermediate sole.
Desmastr. 3/5, D-28832 Achim Nethod for Manufacturing Shoes The invention concerns a method for manufacturing shoes, in which a two-layer sole is sprayed onto a shoe shaft drawn on a last and that the outer sole is sprayed first and then the intermediate sole.
Methods of this type are usually carried out on so-called round table installations in which a plurality of forming stations are arranged radially on the rotatable round table. The forming stations consist of a base stamp which can travel up and down, has at least two shaped side parts which, together with the base stamp, form a mold cavity that is sealed at the top by superimposing a displacer or last.
To shape the outer sole, the mold cavity is first sealed with the displacer. After the forming station has travelled into the area of the spraying station, the nozzle of the injection unit adjoins the sprue runner and sprays the material for the outer sole. The displacer is then driven out of the molding tool. The last covered with the shoe shaft assumes its position. A space remains between the outer sole sprayed in the first step and the underside of the last. The material for the intermediate sole is now sprayed into this space by means of a further injection unit. Intermediate sole and outer sole connect to one another and also the intermediate sole and the shoe shaft drawn onto the last.
Advantageously, the outer sole is made of a non-abrasive material, while the intermediate sole, having regard to a cushioning effect, consists of a flexible material to improve foot comfort.
Due to the difference in the two materials, it does occur that the two materials do not connected sufficiently firmly with one another during sprayion of the intermediate sole. As a result, precautionary measures are taken to make the contact surface between the two materials such that an intimate connecton between the two layers can take place.
According to the method of the invention, a synthetic fiber felt piece, corresponding to the shape of the sole, is inserted for this purpose between outer sole and intermediate sole. When spraying both the outer sole and also during the subsequent spraying of the intermediate sole, both materials penetrate into the felt. When the base stamp travels upward, both the outer sole and the intermediate sole are pressed together so that the material connection between intermediate sole, cut felt piece and outer sole becomes even more intimate.
Thusfar, after the outer sole has been sprayed and the displacer driven out, the felt piece is placed onto the shaped outer sole, after which the space provided for the intermediate sole is formed by superimposing the last. This method is time-consuming which also results therein that, due to the outer sole material hardening, a connection thereof with the felt cut can no longer take place satisfactorily.
Thus, it is the object of the invention to conduct a method of the aforementioned type in such a way that a connection of the outer sole material with the synthetic fiber felt piece or a similar material can already take place during spraying of the outer sole.
The invention solves this object thereby that, prior to spraying the outer sole, a synthetic fiber felt piece is placed on the area of a displacer which is in contact with the form and loaded electrostatically, as a result of which the felt piece is pressed against the metal displacer and adheres to it, the displacer seals the injection mold consisting of the shaped side parts and base stamp with the adhering felt piece, the resultant mold cavity is filled with elastomer material, that, when the base stamp travels upward, the elastomer material is pressed together and elastomer material penetrates into the felt piece, the displacer is driven out of the shaping tool, and replaced by the last covered with the shaft, in such a way that a mold cavity for the intermediate sole remains between last and outer sole, after which this cavity is filled with a synthetic material, whereby this material forming the intermediate sole connects with the felt piece and the shaft and that, finally, the mold is opened and the finished shoe removed from the last.
In this way, it is possible to fasten the felt piece securely to the displacer until the latter has sealed the mold cavity and the cavity is filled with the elastomer material. It was found that the electrostatic adhesion between felt piece and displacer, on the one hand, produces a secure hold of the felt piece on the displacer and in this way, on the other hand, ensures that the felt piece is situated correctly in the shaping tool.
According to a preferred embodiment of the method, the electrostatic charge is accomplished by an ionized air current directed to the cut piece.
In an especially simple embodiment, a conventional, manually operated paint gun, which acts on an electrostatic basis, provides for the ionized air current. The person operating the machine holds the felt piece against the underside of the displacer, directs the ionized air current from the paint gun onto said piece, whereby the latter is, on the one hand, pressed against the displacer due to air pressure and, on the other hand, electrostatically charged. Paint gun and injection-molding machine are thereby grounded, so that the electrostatic attraction unfolds fully and, on the other hand, that there is no danger to the person operating the machine.
In a further embodiment of the method, it can be provided that the cut piece is electrostatically charged directly, for example, by point electrodes.
A somewhat more expensive manner of carrying out the process is given by the features of claim 8. In this case, the felt piece is driven fully automatically by a handling device (robot) in front of a displacer. The modified paint gun is located on the handling device and is controlled in such a way that it is activated when the felt piece has reached its position. In this way, it is ensured that the person operating the machine does not have to reach into the forming station area. Moreover, this results in increased pulse numbers. Instead of the paint gun, an electrode arrangement can also be placed on the handling device, by means of which the felt piece is directly charged electrostatically.
According to claim 4, it is provided that the synthetic fiber felt forms a thin intermediate layer which is, moreover, fully impregnated by the two synthetic materials and can scarcely be noticed visually in the finished shoe.
The thickness of the cut piece is, for example, 1 to 1.3 mm. In this case, polyester can be selected as a material.
Rubber, which is especially abrasion-proof, is chosen as a material for the outer sole while polyurethane, which gives the finished shoe the desired foot comfort, is chosen for the intermediate sole.
Claims (10)
1. Method for manufacturing shoes in which a two-layer sole is sprayed onto a shoe shaft drawn on a last and the outer sole is sprayed first and then the intermediate sole, characterized therein that, prior to spraying the outer sole, a synthetic fiber felt piece is placed against the area of a displacer which is in contact with the form and electrostatically charged, as a result of which the felt piece is pressed against the metal displacer and adheres to it, that the displacer seals the injection mold consisting of shaped side parts and base stamp with the adhering felt piece, that the thus resultant mold cavity is filled with elastomer material, that, when the base stamp travels upward, the elastomer material is pressed together and elastomer material penetrates into the felt piece, and that it is replaced by the last covered with the shaft, in such a way that a mold cavity remains for the intermediate sole between last and outer sole, after which this mold cavity is filled with a synthetic material, whereby this material forming the intermediate sole connects with the felt piece and the shaft and that, finally, the mold is opened and the finished shoe removed from the last.
2. Method according to claim 1, characterized in that the electrostatic charge is produced by an ionized air current directed onto the cut piece.
3. Method according to claim 1, characterized in that the electrostatic charge is produced directly by an electrode arrangement acting on the felt piece.
4. Method according to one of the claims 1 to 3, characterized in that the synthetic fiber felt consists of polyester and has a thickness of 1 to 1.3 mm.
5. Method according to one of the claims 1 to 4, characterized in thatthe elastomer material for the outer sole is rubber.
6. Method according to one of the claims 1 to 5, characterized in that the intermediate sole is made of polyurethane.
7. Method according to one of the claims 1, 2 and 4 to 6, characterized in that the ionized air current is produced by means of an electrostatically operated paint gun and directed to the felt piece.
8. Method according to one of the claims 1 to 5, characterized in that the synthetic fiber felt piece is placed against the displacer by means of an automated handling device or robot.
9. Method according to claim 8, characterized in that the device emitting the ionized air current is coupled with the automated handling device.
10. Method according to claim 8, characterized in that the electrode arrangement effecting the ionization of the felt piece is coupled with the automated handling device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19715551.0-16 | 1997-04-15 | ||
| DE1997115551 DE19715551C2 (en) | 1997-04-15 | 1997-04-15 | Process for shoe manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2234838A1 true CA2234838A1 (en) | 1998-10-15 |
Family
ID=7826473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2234838 Abandoned CA2234838A1 (en) | 1997-04-15 | 1998-04-14 | Method for manufacturing shoes |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0872332A3 (en) |
| BR (1) | BR9801052A (en) |
| CA (1) | CA2234838A1 (en) |
| DE (1) | DE19715551C2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10218239A1 (en) * | 2002-04-24 | 2003-11-13 | Kloeckner Desma Schuhmaschinen | Process for the production of particular soles in machine shoe production |
| DE102008002704A1 (en) | 2007-07-02 | 2009-01-08 | Basf Se | Method for manufacturing composite materials, involves submitting solid material, and polyurethane reaction mixture is applied on solid material |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1111852A (en) * | 1954-10-22 | 1956-03-06 | Footwear such as slippers, shoes or the like and method of making them | |
| DE1193396B (en) * | 1960-12-23 | 1965-05-20 | Spezialmaschinen Co H Ludwig K | Shoe with outsole and midsole |
| DE1485910A1 (en) * | 1965-11-25 | 1969-07-17 | Continental Gummi Werke Ag | Process for the production of molded soles for footwear |
| DE2044745A1 (en) * | 1970-09-10 | 1972-03-23 | Gustav Hoffmann Gmbh, 4190 Kleve | Process for the production of all kinds of shoes with molded footbeds and soles |
| US4123493A (en) * | 1977-05-03 | 1978-10-31 | Bata Shoe Company, Inc. | Method of making a shoe sole having a preformed insert |
| DE3616874A1 (en) * | 1985-05-25 | 1986-12-18 | Klöckner Ferromatik Desma GmbH, 7831 Malterdingen | Method of manufacturing a shoe |
| WO1996034730A1 (en) * | 1995-05-02 | 1996-11-07 | Hans Auer | Process for producing plastic cards or discs with a printed label on one or both sides |
| DE19532101C2 (en) * | 1995-08-30 | 1998-07-23 | Oscar Beck Ag | Device and method for producing a body connected to a label by means of plastic injection |
-
1997
- 1997-04-15 DE DE1997115551 patent/DE19715551C2/en not_active Expired - Fee Related
-
1998
- 1998-02-16 EP EP98102625A patent/EP0872332A3/en not_active Withdrawn
- 1998-04-14 CA CA 2234838 patent/CA2234838A1/en not_active Abandoned
- 1998-04-14 BR BR9801052A patent/BR9801052A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0872332A2 (en) | 1998-10-21 |
| BR9801052A (en) | 1999-12-14 |
| DE19715551A1 (en) | 1998-10-22 |
| DE19715551C2 (en) | 2000-01-27 |
| MX9802903A (en) | 1998-12-31 |
| EP0872332A3 (en) | 2000-03-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |