KR100233872B1 - Polyurethane shoe soles of which the side is coated with polyurethane film, and method and device thereof - Google Patents

Abstract

The present invention relates to a sole and a manufacturing method and a manufacturing apparatus, characterized in that the polyurethane film is automatically coated only on the side of the sole without being coated on the bottom surface.

Method for producing a sole according to the present invention comprises the steps of (i) cylindrically wrapping the side surface (24b) of the sole-shaped protrusion (24a) of the lower mold 24 with a polyurethane film (15); (ii) joining the intermediate mold 23 having the hole 23a coinciding with the protrusion of the lower mold to the lower mold 24, and the cylindrical polyurethane film 15 of (i) to the intermediate mold 23 Passing through the inside of the hole (23a) of the pull up to fix it using a fixing means; (iii) injecting a polyurethane sole production solution into the mold of the (ii) (the lower mold 24 + the middle mold 23) on which the polyurethane film is installed, and then molding the upper mold 22; iv) foaming the injected polyurethane sole manufacturing solution of (iii) to make a polyurethane sole coated with a polyurethane film on the side of the sole automatically.

According to the present invention, the sole bottom surface is coated with only the sole side without being coated by a simple process of simultaneously foaming and coating, thereby easily obtaining a sole suitable for use in a shoe to which rubber outsole is attached.

Description

Polyurethane sole coated with a polyurethane film on the side of the sole, its manufacturing method and manufacturing apparatus

The present invention relates to a sole coated with a polyurethane film on the side of a sole, and a method and a manufacturing method thereof, characterized in that the bottom surface of the sole is automatically coated on the side of the sole without being coated. .

A sole is a sole of a shoe. A polyurethane sole (hereinafter referred to as a "PU sole") refers to a sole of a shoe made of polyurethane, and is generally used in sneakers, gentlemen's shoes, and ladies shoes. PU sole according to the present invention can be mainly used in sports shoes (sneakers) to attach a rubber outsole to the bottom.

Conventionally, a method for producing a PU sole has been formed by molding a polyurethane sole by pouring molding, followed by coating and complex post-processing. In more detail, as shown in FIG. 1, a conventional polyurethane stock solution is injected into a lower mold 1 for manufacturing a PU sole, and then molded with the upper mold 2, and then foamed for a predetermined time to form the same shape as the mold. After shaping the PU sole of the mold; The surface was subjected to coating and post-treatment steps. In this conventional method, since the surface of the PU sole becomes rough due to the fine bubbles generated during foaming, the foamed PU sole is usually coated with enamel spray coating, enamel dipping coating, enamel brushing coating or the like. However, since the coating process is performed separately from the molding of the PU sole, the process becomes complicated, complex post-treatment processes must be performed before and after the coating process, and large amounts of harmful substances such as enamel are released during coating, enamel spray coating and enamel dipping. Conventional coating methods such as coating and enamel brushing coating are difficult to produce a variety of colors, and there is a problem such that the mold must be produced again even with slight design deformation.

Accordingly, the present applicant has filed a patent for a sole manufacturing method that solves these problems, ″ polyurethane sole manufactured using a polyurethane film and its manufacturing method ″ (Patent Application No. 96-35071, filed Aug. 23, 1996). I've done it. Patent application No. 96-35071, as shown in Figure 4, after fixing the polyurethane film to the lower mold (1) for manufacturing PU sole with a fixing means, injecting the PU sole manufacturing solution thereon, the upper mold (2 ) By foaming after molding the polyurethane film is automatically coated on the PU sole. Patent Application No. 96-35071 solves the above-mentioned problems, but the bottom, which is a lot of stretch during foaming, and the part where the bottom meets the side have poor physical properties of the surface coating, so that the adhesive force is reduced when the rubber outsole is bonded. There was a problem of weakness. Therefore, in the case of sports shoes attaching the rubber outsole to the bottom, its use has been limited due to the difficulty of adhesion of the rubber outsole.

Accordingly, the present invention is to provide a PU sole suitable for use in sports shoes to attach a rubber outsole to the bottom by automatically coating the polyurethane film on the sole side without being coated on the sole bottom surface.

1 is an illustration of a conventional polyurethane sole manufacturing process.

2 is an illustration of a manufacturing process of Patent Application No. 96-35071.

3 is a cross-sectional view of a sole made in accordance with patent application No. 96-35071.

4 is an enlarged cross-sectional view of a polyurethane film used in the present invention.

5 is an enlarged cross-sectional view of a product after the polyurethane film is processed.

Figure 6 is an illustration of the upper mold (figure 6 (a)), the intermediate mold (figure 6 (b)), the lower mold (figure 6 (c)) used in the present invention.

FIG. 7 is a perspective view showing a state in which a mold is molded, in which a ″ lower mold + middle mold ″ is combined (Fig. 7 (a)) and a ″ upper mold + middle mold + lower mold ″ is combined (Figure 7 Exemplary diagram (b) is shown.

8 is an illustration of a process according to the invention.

9 is a plan view showing the state where the film is fixed, in which a pin is used as a fixing means (Fig. 9 (a)) and a special fixing device 19 according to the present invention is used as a fixing means (Fig. 9 (b). Exemplary Figs.) To 9th (d) Figs.

FIG. 10 is a cross-sectional view of a state in which a mold is molded (top plate + middle plate + bottom plate), in which a pin is used as a fixing means (Figs. 10 (a) to 10 (b)) and a special fixing device is used as the fixing means. An illustration of the case (FIGS. 10 (c) to 10 (h)).

11 is a plan view (11 (a)), a side view (11 (b)), a rear view (11 (c)), a perspective view (11 (d)) of the sole manufactured according to the present invention ).

12 is a longitudinal sectional view of a sole made in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

1: Lower mold for manufacturing polyurethane sole 2: Upper mold for manufacturing polyurethane sole

3: Polyurethane sole manufacturing solution 3a: Foamed polyurethane sole

4: injector 5: enamel solution

6: container with enamel solution 7: brush for coating

8: polyurethane film 9: base material

10: adhesive 11: dry film layer

12: post-processed surface 13: embossed surface

14: suede cotton 15: polyurethane film

16: film fixing pin 17: air layer

18: magnet 18a: thin iron plate

19: Rolling film winding film (film fixing device) 20: Bevel gear

21: handle 22: upper mold

22a: protrusion 23: intermediate mold

23a: hole 24: lower mold

24a: projecting part 24b: projecting part side

25: hinge for joining the upper, middle and lower plate of the mold 26: Foaming machine

27: film front side 28: film rear side

29: sewing seat 30: finished polyurethane shoot

The present invention relates to a sole and a manufacturing method and a manufacturing apparatus, characterized in that the polyurethane film is automatically coated only on the side without being coated on the bottom surface.

Method for producing a sole according to the present invention comprises the steps of (i) cylindrically wrapping the side surface (24b) of the sole-shaped protrusion (24a) of the lower mold 24 with a polyurethane film (15); (ii) joining the intermediate mold 23 having the hole 23a coinciding with the protrusion of the lower mold to the lower mold 24, and the cylindrical polyurethane film 15 of (i) to the intermediate mold 23 Passing through the inside of the hole (23a) of the pull up to fix it using a fixing means; (iii) injecting a polyurethane sole production solution into the mold of the (ii) (the lower mold 24 + the middle mold 23) on which the polyurethane film is installed, and then molding the upper mold 22; iv) foaming the injected polyurethane sole manufacturing solution of (iii) to make a polyurethane sole coated with a polyurethane film on the side of the sole, and in the present invention, the top plate 22 (″ upper mold ″). ), A middle plate 23 (also referred to as "middle mold") and a lower plate 24 (also referred to as "lower mold") are used. Hereinafter, each step will be described in detail with reference to the accompanying drawings.

(i) The side surface 24b of the sole-shaped protrusion 24a of the lower mold 24 is cylindrically wrapped with the polyurethane film 15.

In the lower mold 24 used in the present invention, as shown in FIG. 6 (c), the center portion protrudes in the shape of a sole. The protrusion is preferably about 1 to 3 cm. The side surface 24b of the protruding portion 24a is vertically wrapped around the polyurethane film to enclose it in a cylindrical shape (see also eighth (a)). Thus, the film is placed vertically to wrap the side of the protruding portion so that the film is coated only on the side of the sole without being coated on the bottom of the sole or only a part of the bottom and the side contacting the side.

The polyurethane film used in the present invention is subjected to pretreatment such as water treatment, release agent treatment, and the like, such as nylon Dow and polyester fabric, to give a peel strength of 10 to 300 g / cm 2, and a wet silver layer thereon in a conventional manner. It is a polyurethane wet film obtained by peeling the substrate after forming a. Here, the wet silver layer refers to a microporous layer structure formed by coating a mixture solution containing a known surfactant, filler, and DMF (dimethyl formamide) in a polyurethane wet resin solution using a solvent mixed with water.

Various post-processing treatments, such as a wet silver layer, are formed on the surface of the coating polyurethane film used in the present invention, and optionally, patterns and colors are put on the surface to reinforce the physical properties and appearance of the surface (figure 5 (b)). The surface may be pressed with an embossing roller (see also section 5 (c)), or the surface may be buffed with sand paper to make suede (see section 5 (d)). By doing so, it is also possible to produce a PU sole having various appearances. Moreover, the polyurethane dry and wet film manufactured by carrying out dry lamination (refer also to 3 (a)) again on a thermoplastic polyurethane film or a polyurethane film can also be used.

Polyurethane film for coating used in the present invention should be able to be stretched in the same shape as the mold when foaming should have flexibility and elasticity, and should have an adhesive force that can be strongly adhered to the PU sole without a separate adhesive. Therefore, in the present invention, it is preferable to use a polyurethane film having an elongation of 200% or more and an adhesive strength of 2.5 kg / cm 2 or more.

It is also possible to coat the bottom of the sole to the desired shape by deforming the bottom mold. That is, by dividing the lower mold and coating a part of the polyurethane film, and then assembling the mold to be used to coat a specific part desired to make a variety of products.

(ii). The intermediate mold 23 having a hole 23a coinciding with the protruding portion of the lower mold is joined with the lower mold 24, and the cylindrical polyurethane film 15 of (i) is formed into the hole of the intermediate mold 23. (23a) Pass it inward, pull it up, and fix it using fixing means (see also (8) (a) and 8 (c)).

The intermediate mold 23 used in the present invention is characterized in that there is a hole corresponding to the protrusion of the lower mold, as shown in Figure 6 (b). The upper part of the intermediate mold preferably has a protrusion having a constant width along the hole. By making the hole portion of the intermediate mold coincide with the protrusion portion of the lower mold, the polyurethane film of (i) sandwiched therebetween can be firmly fixed. Therefore, the coincidence at this time means that the polyurethane film almost coincides so that it can be firmly fixed.

As a fixing means, a general pin or nail may be used, but in the present invention, it is preferable to use a film fixing device 19 which is a specially designed device for pulling the film so that it does not be folded, and the pin or nail is used as an auxiliary fixing means. It is desirable to. As shown in FIG. 8 (b), the film fixing device 19, that is, the film is fixed to the rod for winding the film once, and then the film is wound on the rod to be pulled firmly. At this time, the fixing between the film and the rod mainly uses a magnet 18 attached to the groove 19 at regular intervals to the rod 19, in addition to using a pin or nail as an auxiliary fixing means. In addition to pulling the film firmly so that the film does not fold, these fixing means serve as a support for the elongated film during the PU sol preparation.

Referring to the fixing method of the film in more detail as follows. First, cut four sections vertically at about one third of the height so as to easily fix the cylindrical polyurethane film that has been raised on the middle plate, and then put each part on the rod 19 for winding the film, and then a thin iron plate 18a. Press the film on the stick with the rod (see 8 (b) and 8 (c)). After fixing the film by using the magnetic force between the magnet and the iron plate, use the nail or pin to fix the film. Secure the film by attaching to the back of the rod. After the film is fixed to the rod 19, the knob 21 is rotated counterclockwise so that the rods 19 connected to the bevel gear 20 rotate and roll the film, and the film is wound on the rod and pulled out. Since the film is placed in the lower mold, the wrinkled portions of the film formed are spread out. At this time, it is preferable to use about 2 to 10 magnets, thin iron plates, fixing pins, etc., and arrange them in a suitable form so that the film can be wound on the rods.

(iii). After injecting the PU sole manufacturing solution into the mold (lower mold 24 + middle mold 23) of the above (ii) in which the polyurethane film is installed, the upper mold 22 is molded.

As shown in FIG. 8 (c), after the injection of the PU sole manufacturing solution into the inside of the mold (lower plate + middle plate) provided with the polyurethane film, the upper mold 22 is molded.

The upper mold 22 used in the present invention is characterized in that the sole-shaped protrusion 22a protrudes downward (see also sixth (a)).

As a PU sole stock solution, a polyurethane foam stock solution is usually used. The polyurethane foam stock solution used in the present invention preferably contains a polyol, a diisocyanate prepolymer and a foam stabilizer for controlling foaming. In this case, a polyol (including H ₂ O as a blowing agent) and a diisocyanate prepolymer react to form a polyurethane polymer, and carbon dioxide released serves as a blowing agent. Since the foaming takes place only under the proper conditions, the molar mixing ratio and the chemical properties of the polyol and the diisocyanate prepolymer should be taken into account. ), A polyurethane foam stock solution containing 0 to 1.5 parts by weight of the foam stabilizer and 0.1 to 1.1 parts by weight of H ₂ O is preferable.

As the polyol used in the polyurethane resin liquid for producing the PU sole, all types of polyols, such as polyester type polyol and polyether type polyol, may be used.

In forming a polyurethane foam, a foam stabilizer is generally used for the purpose of controlling foaming. As the foam stabilizer, a surfactant is usually used, and in the present invention, it is preferable to use a silicone foam agent. Since the foam stabilizer has a property of preventing adhesion between the polyurethane resin and the polyurethane film, it is preferable to use the foam stabilizer at 0 to 1.5 parts by weight when considering the adhesion between the PU sole and the polyurethane film.

(iv). Foaming the injected PU sole manufacturing solution of (iii) to make a polyurethane sole coated with a polyurethane film on the side of the sole automatically.

Typically, foaming is carried out using a polyurethane foam machine, where the foamer serves to maintain the PU sole stock solution at a constant temperature and pressure and to facilitate mixing.

Since the PU sole manufacturing solution and the polyurethane film are bonded without a separate adhesive, it is preferable that the tack free time (tack-free time) is a little longer to 1 to 2 minutes in order to increase the adhesion between the two.

In the foaming step, the temperature of the PU sole manufacturing stock solution is important because it affects the viscosity of the stock solution. In the present invention, the temperature of the stock solution is preferably 30 to 50 캜 and the mold temperature is 35 to 65 캜.

Referring to the foaming process of the present invention in more detail as follows. That is, after maintaining the mold (lower plate + middle plate) with a polyurethane film at 35 ~ 65 ℃ injection of 30 ~ 50 ℃ shot manufacturing solution into the inside of the mold and molding the upper mold; When the mold is heated for 30 seconds to 2 minutes, the internal temperature of the PU sole during foaming rises to 110 ~ 160 ℃, and the PU sole and the polyurethane film react with the PU sole manufacturing solution as the foaming and curing progresses. The viscous contact of the close contact, the close contact the film is automatically made by the foaming pressure; At the same time, the volume of undiluted solution increases and pushes the air layer in the mold, so the foamed PU sole is filled to every corner of the mold, and the foaming is completed. As a result, the portion where the PU sole and the polyurethane film are bonded is also cured to complete the adhesion. As a result, once molding is completed, the PU sole is not yet completely cured, so that a curing process is performed for a predetermined time. Aging is carried out at 35 to 65 ° C. for 2 to 15 minutes. As a specific aging method, the entire mold containing the foaming agent is put in a heat stall in which hot air circulates, and an electric heating wire or steam is put in the mold. When the aging is completed, demoulding is performed to remove the PU sole from the mold, thereby obtaining a finished PU sole coated with a polyurethane film on only the side of the sole, or a part of the sole side and the bottom surface in contact with the side.

The present invention will be described in more detail with reference to the following Examples. The following examples are not to be construed as limiting the scope of the invention, but of course, ordinary changes are possible by those skilled in the art within the scope of the invention.

Example 1

[i) Production of Polyurethane Film]

100 parts by weight of a polyurethane wet resin (solid content 30%) having a viscosity of 20000 cps (20 ° C), 1 part by weight of anionic surfactant, 1 part by weight of nonionic surfactant, and DMF (dimethyl formamide) based on 210T nylon Dow The polyurethane solution containing 50 parts by weight was directly coated with a knife coater 1.0 mm, and 20 seconds later, the back side of the forge was uniformly wet with water. This was solidified in water at 40 ° C. for 10 minutes, washed with water at 60 ° C. for 30 minutes (completely extracted with DMF), dried at 120 ° C. for 10 minutes, and the substrate was peeled off to obtain a polyurethane film having an appropriate peel strength. .

[(ii) Preparation of PU Sol]

After the polyurethane wet film obtained in the above (i) is installed in the lower mold for manufacturing PU sole of a desired shape and fixed using an intermediate mold and a fixing means, the temperature is maintained at about 55 ° C,

49.5 parts by weight of polyester polyol

50 parts by weight of diisocyanate prepolymer

0.3 parts by weight of a silicone surfactant

0.2 parts by weight of H ₂ O

After injecting a 40-degree PU sole manufacturing solution containing a into the inside of the mold (lower plate + middle plate) provided with a polyurethane film, the upper plate of the mold was molded. Heat the mold and react the PU sol manufacturing solution within 7 seconds to 2 minutes to raise the reaction temperature to 120 ℃ ~ 160 ℃ .After foaming is completed, mature the mold at 50 ℃ for 5 minutes, completely cured A finished PU sole was made with the film coated on the side.

Example 2

A thermoplastic polyurethane film was obtained through a known process using a thermoplastic polyurethane resin having a viscosity of 20000 cps. After the polyurethane film obtained above was installed in the lower mold for producing the PU sole of a desired shape and fixed using an intermediate mold and a fixing means, the temperature was maintained at about 55 ° C.

44 parts by weight of polyester polyol

55 parts by weight of diisocyanate prepolymer

0.4 parts by weight of a silicone surfactant

H ₂ O 0.6 parts by weight

After injection of a 45-degree PU sole manufacturing stock solution containing a PU film into the mold (lower plate + middle plate) is installed, the upper mold was molded. Heat the mold to react the PU sol mixed stock between 7 seconds and 2 minutes to raise the reaction temperature to 120 ℃ ~ 160 ℃, and after foaming is completed, mature at 47 ℃ for 7 minutes to completely cure and demold. A finished PU sole was made with the film coated on the side.

Example 3

[i) Production of Polyurethane Film]

180 g / m2 of a solution containing 100 parts by weight of a one-component polyurethane resin (30% solids), 30 parts by weight of dimethyl formamide (DMF), and 30 parts by weight of methyl ethyl ketone (MEK) on a nylon dow substrate with a knife coater After application, it was completely dried at 130 ℃, and then semi-dried at 100 ~ 150 ℃ by applying 1000g / m2 of adhesive made of 2-component polyurethane resin (solid content 50 ~ 70%) on the polyurethane resin surface which is not in contact with the substrate. And after sticking with a polyurethane film, it matured at 10 degreeC for 2 days, the base material was peeled off, and the film by which the polyurethane wet film and the polyurethane dry film were bonded was obtained.

[(ii) Preparation of PU Sol]

The wet film and the dry film obtained in the above (i) is installed in a lower mold for manufacturing a PU sole of a desired shape, the polyurethane film is bonded, and fixed by using an intermediate mold and a fixing means, while maintaining the temperature at 60 ℃,

53.5 parts by weight of polyester polyol

45 parts by weight of diisocyanate prepolymer

0.4 parts by weight of a silicon surfactant

H ₂ O 1.1 parts by weight

After the injection of 47 ℃ of the PU sole manufacturing solution containing a into a mold (lower plate + middle plate), the polyurethane film is installed, the upper mold was molded. Heat the mold to react the PU sol mixed stock solution between 7 seconds and 2 minutes to raise the reaction temperature to 120 ℃ ~ 160 ℃, mature at 4 ℃ for 4 minutes after foaming is completed, completely cured and demolded Finished PU soles were coated on this side.

Example 4

After installing the polyurethane film obtained in the step (i) of Example 1 in the lower mold for producing the PU sole of the desired shape, and fixed using the intermediate mold and the fixing means, while maintaining the temperature at about 65 ℃,

47 parts by weight of polyether polyol

52 parts by weight of diisocyanate prepolymer

0.2 parts by weight of a silicone surfactant

0.8 parts by weight of H ₂ O

After injection of a 45-degree PU sole manufacturing stock solution containing a PU film into the mold (lower plate + middle plate) is installed, the upper mold was molded. Heat the mold to react the PU sol mixed stock solution between 7 seconds and 2 minutes to raise the reaction temperature to 120 ℃ ~ 160 ℃, mature at 4 ℃ for 4 minutes after foaming is completed, completely cured and demolded Finished PU soles were coated on this side.

According to the present invention, it is possible to obtain a PU sole in which a polyurethane film is automatically coated on only the side of the sole without being coated on the sole bottom by a simple process without undergoing a separate coating process. That is, according to the present invention, the sole bottom surface is not coated, and only the side is coated, so that a sole suitable for use in shoes having a rubber outsole attached thereto may be easily obtained by a simple process of simultaneously foaming and coating.

Claims (9)

CLAIMS 1. A method for producing a polyurethane sole coated with a polyurethane film, comprising: (i) cylindrically wrapping a side face 24b of a sole shaped protrusion 24a of a lower mold 24 with a polyurethane film 15; (ii) joining the intermediate mold 23 having the hole 23a corresponding to the protruding portion of the lower mold to the lower mold 24, and the cylindrical polyurethane film 15 of (i) to the intermediate mold 23 Pass through the inside of the hole 23a) and pull it up, and fix it using the fixing means; (iii) injecting a polyurethane sole production solution into the mold of the above (ii) in which the polyurethane film is installed (lower mold 24 + middle mold 23), and then molding the upper mold 22; (iv) Method of producing a polyurethane sole, characterized in that the polyurethane film is prepared by foaming the injection of the injection injection of the polyurethane sole of (iii) only on the side of the sole. The method according to claim 1, wherein the polyurethane film is obtained by pretreating the substrate to give a peel strength of 10 g / cm 2 to 300 g / cm 2, and forming a wet silver layer thereon in a conventional manner, and then peeling the substrate. Elongation is 200 ~ 800%, the method of producing a polyurethane sole, characterized in that the adhesive strength of the film itself is 2.5kg / ㎠ or more. The method of claim 1, wherein the polyurethane film is a thermoplastic polyurethane film having an elongation of 200% or more. According to claim 1 or 2, wherein the polyurethane sol preparation stock solution is 30 to 50 parts by weight of polyester polyol, 30 to 50 parts by weight of diisocyanate prepolymer, 0 to 1.5 parts by weight of foam stabilizer And 0.1 to 1.1 parts by weight of a polyurethane foam solution containing H ₂ O. According to claim 1 or 2, wherein the foaming temperature of the mold is maintained at 35 ~ 65 ℃, the temperature of the injection of polyurethane sol manufacturing solution is 30 ~ 50 ℃, 7 seconds to 2 minutes by heating the mold Polyurethane sole manufacturing solution is reacted between the reaction method of producing a polyurethane sole, characterized in that the reaction temperature rises to 110 ~ 160 ℃. (i) cylindrically wrapping the side surface 24b of the sole-shaped protrusion 24a of the lower mold 24 with the polyurethane film 15; (ii) joining the intermediate mold 23 having the hole 23a corresponding to the protruding portion of the lower mold to the lower mold 24, and the cylindrical polyurethane film 15 of (i) to the intermediate mold 23 Pass through the inside of the hole 23a) and pull it up, and fix it using the fixing means; (iii) injecting a polyurethane sole production solution into the mold of the above (ii) in which the polyurethane film is installed (lower mold 24 + middle mold 23), and then molding the upper mold 22; (iv) Polyurethane sole coated with a polyurethane film on the side of the sole, characterized in that the polyurethane film is prepared by foaming the injection of the injection of the polyurethane sole manufacturing solution of (iii) automatically only on the side of the sole. (a) a lower mold 24 having a portion 24a projecting in the shape of a saw; (b) an intermediate mold (23) having a hole (23a) coinciding with the protruding portion (24a) of the lower mold (24), to which film fixing means is attached; And (c) an upper mold 24 having a portion 22a protruding in the shape of a saw. Polyurethane sol manufacturing apparatus comprising a. 8. The apparatus according to claim 7, wherein the film fixing means attached to the intermediate mold (23) is a rod (19) for winding a film connected to the bevel gear (20). 9. The rod (19) according to claim 8, wherein the rod (19) is grooved at regular intervals to attach a magnet (18) and is separately provided with the magnet (18) as a means for fixing a polyurethane film to the rod (19). Apparatus for producing a polyurethane sole, characterized in that using a thin iron plate (18a).

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