RU2342893C2 - Inner sole by order - Google Patents

Abstract

FIELD: items of personal use and for household.

SUBSTANCE: inner sole by order contains upper layer from synthetical fabric, middle layer that is foaming layer and lower layer from resinous composition. In such inner sole by order to the side part of the lower layer there is temperature-inductive film attached. The lower layer of the inner sole is thermoplastic layer from mixed resin that cures at cooling in the transformed shape, changes its shape under pressure at the temperature providing transformation. Because of attachment of the temperature-inductive film to the lower layer of the inner sole by order it is easy to define suitable temperature for transformation of the inner sole, because the indicated area in the temperature-inductive film at 71°C (suitable temperature for transformation of the inner sole) changes it colour from silver to black. Weight proportion of the resinous composition components of the lower layer is: low-density polyethylene - 38-42%, low-density linear polyethylene - 32-34%, ethylene vinyl acetate - 6-7%, foaming material - 1.4-2.0%, zinc oxide - 2.0-2.4%, and as addition agent there is monostearate - 0.8-1.2%, cross bond material - 0.8-1.2%, filler - 10-12% and colour - 5-7%.

EFFECT: single heating for further profile formation.

2 cl, 5 dwg, 1 tbl

Description

The invention relates to a custom insole, which is custom-made and which consists of synthetic fabric (top layer (20a)), a foaming layer (middle layer (20b)) and a layer of mixed resin (bottom layer (20c)). In this custom-made insole, a temperature-inductive film (30) is attached to the side clean of the bottom layer (20c) of the insole. The specified lower layer (20C), consisting of a thermoplastic layer of a mixed resin, which is characterized by hardening of the transformed form after cooling, changes its shape under pressure at a temperature that provides transformation. By attaching the temperature-inductive film to the side of the lower layer of the custom insole, it is easy to determine the appropriate temperature for the transformation of the insole, since the indicator portion in the temperature-inductive film at 71 ° C (the appropriate temperature for the transformation of the insole) changes its color from silver to black.

The invention will now be explained in more detail with reference to the accompanying drawings, in which

figure 1 is a schematic view of a custom insole of a known type;

figure 2 is a schematic view of another variant of a custom insole;

figure 3 is a schematic view of a custom insole according to the invention, in which the temperature-inductive film is attached to the side of the lower layer of the insole;

4 is a diagram of the lower surface of a custom insole according to the invention, in which the temperature-inductive film is attached to the side of the lower layer of the insole;

Figure 5 is an enlarged view of a temperature-inductive film attached to the side of the lower layer of the insole.

The drawings show the following items:

20 - insole

20a - the upper layer of the insole,

20b - the middle layer of the insole,

20 s - the bottom layer of the insole,

30 - temperature-inductive film.

The invention relates to a custom insole. A temperature-inductive film is attached to the side of the bottom layer of the insole, which makes it easy to determine the appropriate transformation temperature and then easily form an insole fitted to the foot of any client.

Typically, the insole consists of upper, middle and lower layers. Despite the variety of forms and types of feet of each person, all insoles have stereotypical structure and shape. Therefore, there are often such cases that it is inconvenient to wear new shoes, because the foot does not match the shoes or insole.

Therefore, to solve such problems, several solutions have already been proposed. So, according to US patent 6346210 B1, publ. 2002, illustrated in figure 1, the insole (20) consists of a thin upper shell (21) and a layered foam-forming plastic (laminate) (23). As is clear from FIG. 1, after heating the insole (20) in the microwave oven and exposing the human foot to it in the direction indicated by the arrow, a custom insole is formed upon cooling. According to the patent of the Republic of Korea 10-2004-047905, publ. 2005 and illustrated in FIG. 2, a custom-made insole corresponding to the shape and features of a particular foot, respectively contains a layer (11) woven of threads, on one side of the fabric layer (11) a foaming layer (12), consisting of foaming materials with open cells, on the foaming layer (12 ) a layer of nonwoven material (13), a fusible layer (14) of thermoplastic resin, supporting a foaming layer (12) below the layer of nonwoven material (13). But in the case of the aforementioned patents, in order to form the insole, it is necessary to repeat the operation of heating it in the oven or a hairdryer (for drying hair) repeatedly because it is difficult to determine a suitable transformation temperature.

To solve such problems, a temperature-inductive film is attached to the side of the bottom layer of this insole, which makes it easy to recognize a color change from silver to black at a transformation temperature of the custom insole (71 ° C). The main objective of the invention is to produce such a custom insole.

In such an insole, the upper layer is fabric, the middle is a foaming layer and the lower is a mixed resin layer. The lower layer consists of a thermoplastic mixed resin, the main components of which are low density polyethylene (LDPT), linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA). Thus, the insole is made with the possibility of transformation at 71 ° C, and at room temperature it cools and hardens, maintaining the transformed shape.

As shown in FIG. 3, 4 and 5, a custom insole with such a structure consists of synthetic fabric (upper layer (20a)), a foaming layer (middle layer (20b)) and a mixed resin layer (lower layer (20c)). In this custom-made insole, a temperature-inductive film (30) is attached to the side of the bottom layer (20c) of the insole. The specified lower layer (20C), consisting of a thermoplastic layer of a mixed resin, which is characterized by hardening of the transformed form after cooling, changes its shape under pressure at the temperature of transformation.

Here, the upper layer (20a) forms a regular synthetic fabric, and the middle (20b) is a foam-forming layer that absorbs mechanical shocks. It is desirable to use ethylene vinyl acetate (EVA) as a foaming material.

In a custom insole, the bottom layer is transformed, heating it to 71 ° C and bringing the upper part of the insole into contact with the foot, thus exerting pressure on it, form the necessary shape. The bottom layer (20c) of the insole is under pressure and is formed in the shape of the foot. Then, at room temperature, the insole cools and hardens, maintaining a formed look. The suitable transformation temperature is easily determined thanks to the indicative portion (11) in the temperature-inductive film. Those. at a temperature of 71 ° С its color changes from silver to black. If at the time of the color change of the indicative section, the load is reapplied, then the custom insole cools and hardens in the changed state. If the formation of the insole is unsuccessful, its reformation is possible.

The temperature-inductive film used changes color as the temperature changes. Its molecular structure varies with temperature. Due to this property, the color of the temperature-inductive film changes if it is a certain time at a certain temperature. Using this property, they created a thin-film thermometer. If it is applied to the forehead for 15 ~ 20 seconds, then its color will change in accordance with the temperature. Those. with red color the temperature is 36 ~ 37.5 ° С, with green color 37.6 ~ 38 ° С, with blue color higher than 38 ° С.

In order to heat the temperature-inductive film (30), it is necessary to increase the temperature of the furnace to 90 ° C. When the insole reaches a temperature of 71 ° C inside the furnace, the indicator section (L1) in the film changes its color from silver to black, which makes it easy to determine the appropriate transformation temperature with the naked eye.

In connection with this invention, a suitable temperature at which the color of the film changes is 71 ° C. At this time, the actual temperature of the insole itself (20) may differ from the transformation temperature, but in this invention the moment of color change in the film (30) is considered to be the moment the appropriate transformation temperature of the custom insole is reached.

If the temperature is higher than the indicated suitable transformation temperature, then due to the hot state of the insole, difficulties arise when it is in contact with the foot, which makes it difficult to create the necessary shape. And if the temperature is lower than the indicated suitable transformation temperature, then the thermoplastic mixed resin in the lower layer (20c) of the insole does not reach a sufficient temperature to create the necessary shape, which creates the possibility of imperfect formation.

The main components of a thermoplastic blended resin are low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and ethylene vinyl acetate (EVA). Therefore, the insole has the possibility of transformation at 71 ° C, and at room temperature it cools and hardens, maintaining the transformation form.

The following weight ratio of the components in the production of this resin is desirable: low density polyethylene (LDPE) - 38-42%, linear low density polyethylene (LLDPE) - 32-34%, ethylene vinyl acetate (EVA) - 6-7%, foaming material - 1, 4-2.0%, zinc oxide - 2.0-2.4%, as an additive monostearate - 0.8-1.2%, cross-linking material - 0.8-1.2%, filler - 10- 12%, dye - 5-7%.

The positive weight mixing ratio of the components of this resin is as follows: low density polyethylene (LDPE) - 38-42%, linear low density polyethylene (LLDPE) - 32-34%, ethylene vinyl acetate (EVA) - 6-7%. If the weight ratio is outside the specified limits, this will lead to a change in the appropriate transformation temperature, which will make it difficult to determine the moment of insole transformation. The weight ratio of mixing ethylene vinyl acetate (EVA) is preferably 5-7%. Within the framework of this ratio, the role of mutual complementation is played by polyethylene, which has a good mechanical characteristic with a transverse connection at low temperature, and ethylene vinyl acetate, which has weak mechanical properties and is resistant to mechanical shocks. The use of ethylene vinyl acetate improves mechanical properties and improves interaction with a non-polar resin such as low density polyethylene, linear low density polyethylene, etc. The foaming material formed by the thermoplastic mixed resin improves impact resistance, it is desirable to use it in a weight volume of 1.4-2.0%. If the added amount of foaming material does not reach the specified limits, then the mixed resin forms a foam in insufficient volume. Conversely, if the amount of foaming material exceeds the specified limit, then so much resin is formed that the mechanical performance deteriorates. As the foaming material, it is desirable to use a conventional foaming material such as Azo di Carbonate Amide (ADCA). The decomposition temperature of Azo di Carbonate Amide is relatively high and is 210 ° C. Therefore, to reduce the decomposition temperature of the foaming material Azo di Carbonate Amide, it is necessary to add decomposition activating agents (catalyst). Zinc oxide is used as an activator to reduce the decomposition temperature of Azo di Carbonate Amide, the desired amount of addition of which is 2.0-2.4%. The addition of zinc oxide within the specified limits allows to reduce the temperature too high and at the same time decompose the cross-linking material.

To cover the foaming material, monostearate is used in a weight volume of 0.8-1.2%. Of the types of monostearate, zinc stearate, calcium stearate, magnesium stearate and aluminum stearate can be used. For the transverse compaction of low-density polyethylene and linear low-density polyethylene, it is recommended to add material for the transverse connection in a weight volume of 0.8-1.2%. An insufficient amount of crosslinking material causes insufficient crosslinking of the mixed resin, and an excess causes an increase in the crosslinking density, which reduces the cell size of the foaming material, thereby reducing its elasticity. For cross-linking, it is desirable to use dicumyl peroxide. Within 10-12% in a weight volume to regulate degradation resistance, heat resistance, compression, etc. add filler. According to this invention, calcium carbonate, titanium dioxide, clay can be used. It is quite acceptable to add a dye of 5-7% by weight, choosing it at the request of the customer or the needs of the consumer.

At 71 ° C, the temperature-inductive film changes its color from silver to black, but when the transformation temperature changes as a result of regulation depending on the mixing ratio of the components in the thermoplastic mixed resin, then a temperature-inductive film that is inducted at a changed transformation temperature can be used.

The following describes in more detail examples for the formation of a custom insole (examples 1 and 2).

1. Create custom insoles

Create custom insoles according to the table using thermoplastic mixed resin.

 (ratio unit:%) order component examples one 2 one low density polyethylene 38 42 2 linear low density polyethylene 34 32 3 ethylene vinyl acetate 7 6 four foaming material Azo di Carbonate Amide 2 1.4 5 zinc oxide 2 2 6 calcium stearate one 0.8 7 dicumyl peroxide one 0.8 8 filler 10 10 9 paint 5 5

2. An experiment on the formation of custom insoles

The following is an experiment on the formation of a custom insole created according to the specified mixture ratio.

1) After pre-heating the oven to 90 ° C, the insole is placed in the oven for 2 minutes, when the insole reaches 71 ° C, the color of the temperature-inductive film changes from silver to black. If after 2 minutes the color of the indicator portion in the temperature-inductive film does not change, then the insole continues to be heated, while checking the color change of the temperature-inductive film every 20 seconds.

2) When the color of the indicator portion of the temperature-inductive film changes from silver to black, the heated insole is removed from the oven and put into the inner base of the shoe.

3) To make full contact of the foot with the insole, the heel area should be in contact with the back of the shoe, while it is necessary to tie the laces and stand for 2 minutes with your feet shoulder width apart.

4) If necessary, after 2-3 days of operation, reform the insole in the above order.

3. Result of custom insole experiment

As a result of experiments with samples of examples 1 and 2 according to the method 1) -3), custom insoles were successfully formed at the time of the color change of the temperature-inductive film. In the case of a custom insole created according to the methodology of the present invention, it is possible to accurately determine the moment of formation of the insole.

A custom insole with a temperature-inductive film is used not only at the specified transformation temperature. If the transformation temperature of the mixed resin varies depending on its type and the ratio of the components of the mixture, then at a changed transformation temperature, a film that provides temperature inductance can be used, while depending on the types of temperature-inductive film, the colors to be changed may be different.

By attaching the temperature-inductive film to the side of the lower layer of the custom insole, it is easy to determine the appropriate transformation temperature due to the fact that at a suitable temperature of 71 ° C the indicator section of the temperature-inductive film changes its color from silver to black.

Claims (2)

1. A custom insole that contains a top layer (20a) of synthetic fabric, a middle layer (20b) of foaming material, and a bottom layer (20c) of a mixture of resins, with a temperature-inductive film attached to the side of the bottom layer (20c) ( 30), characterized in that the temperature-inductive film (30) changes its color at 71 ° C, and the bottom layer (20c) of the insole is made of thermoplastic from a mixture of resins, which changes its shape under pressure at a transformation temperature and cures when cooled in a modified form. 2. The insole according to claim 1, characterized in that the weight ratio of the components of the resin mixture of the lower layer (20s) is: low density polyethylene 38-42%, linear low density polyethylene 32-34%, ethylene vinyl acetate 6-7%, foaming material 1 , 4-2.0%, zinc oxide 2.0-2.4%, and as an additive, monostearate 0.8-1.2%, cross-linking material 0.8-1.2%, filler 10-12% 5-7% paint.

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