KR101597486B1 - Manufacturing apparatus of synthetic leather being capable to heat with uniform temperature - Google Patents

Abstract

The present invention relates to a synthetic leather manufacturing apparatus capable of heating with uniform temperature, which comprises: a supply unit transferring release fabric in which a resin layer is formed by a synthetic resin coated with uniform thickness; a tension unit arranged along the direction of transferring the release fabric to guide the release fabric to maintain regular tension; a heating unit including a heating roller, transferring the release fabric in the state of coming into contact with the heating roller and being heated and at the same time, spraying air, heated with predetermined temperature, over an area corresponding to a contact portion between the heating roller and the release fabric; a cooling unit including a cooling roller, and coming into contact with the release fabric, having passed the heating unit, to transfer the release fabric in one direction while cooling the release fabric and the resin layer; and a forming unit forming a predetermined pattern on the resin layer, wherein the contact portion between the heating roller and the release fabric is heated with uniform temperature.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a synthetic leather manufacturing apparatus capable of heating a uniform temperature,

The present invention relates to a synthetic leather manufacturing apparatus capable of heating a uniform temperature, and more particularly, to a method of manufacturing a synthetic leather manufacturing apparatus capable of heating uniform temperature over a predetermined size surface of a release fabric along a feeding direction, The present invention relates to a synthetic leather manufacturing apparatus capable of heating at a uniform temperature so as to be able to acquire a desired product.

Leather products are classified into natural leather produced by processing leather of animals, synthetic leather produced by applying synthetic resin to materials such as nonwoven fabric and film.

In the case of natural leather, since some species of animals are facing the extinction crisis, they can not be mass-produced and are traded at high prices.

As a substitute for such natural leather, synthetic leather capable of mass production can be provided.

Synthetic leather can be manufactured largely wet and dry and paper.

Here, the dry type may be manufactured by applying a chemical compounded with toluene, acetone, isopropyl, alcohol, polyurethane or the like onto the release paper and then attaching the chemical to the fiber fabric using an adhesive.

At this time, the wet type may be manufactured by applying a chemical compounded with polyurethane, dimethyl formaldehyde, etc. to a textile fabric to form a leather layer, and passing it through high temperature water to cure.

In addition, the paper method is also manufactured in a form similar to the dry method.

However, in the case of synthetic leather, dry, wet and paper forms a pattern on the surface of the synthetic resin in order to realize the desired effect of natural leather. This pattern is uniformly and constantly There was a lot of difficulty in being heated and pressurized to produce.

Particularly, embossing is performed to form the above-mentioned pattern. If the temperature is not uniform in the embossing process, the resin layer is peeled from the fabric after the synthetic leather is produced.

If the temperature is higher than the set range in the embossing process, the hardness may become higher than necessary, which may result in difficulty in processing the product. If the temperature is too lower than the set range, pattern formation is not smoothly and surely performed. The resin layer is peeled off.

In addition, when the above-described temperature condition is not met in the embossing process and a deviation occurs in the left and right sides in the direction in which the fiber cloth is fed, the uniformity of the quality of the product is lowered.

In addition, there is a problem that it is difficult to maintain the temperature uniformity in the embossing process by the season, and in the winter season, there was a problem in such a manufacturing process.

Patent No. 10-1022828 Patent No. 10-1202966

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method of manufacturing a uniform, high-quality synthetic leather product by heating uniformly over a predetermined- And to provide a synthetic leather manufacturing apparatus capable of heating temperature.

According to an aspect of the present invention, there is provided a printing apparatus comprising: a supply unit for transferring a release fabric having a resin layer formed by a synthetic resin applied to a predetermined thickness in one direction; A tension unit disposed along a direction in which the release material is conveyed to guide the release material to maintain a predetermined tension; Wherein the heating roller is brought into contact with the heating rollers so that the heating rollers contact the heating rollers in a heated state and at the same time the air heated to a predetermined temperature over an area corresponding to a portion where the heating rollers and the release- A heating unit for spraying; A cooling unit including a cooling roller, a cooling unit for contacting the release fabric having passed through the heating unit and cooling the release fabric and the resin layer while transferring the release fabric in one direction; And a forming unit for forming a predetermined pattern on the resin layer, wherein a portion where the heating roller and the releasing fabric contact each other is heated to a uniform temperature, and a synthetic leather manufacturing apparatus capable of heating the uniform temperature can do.

Here, the forming unit is a pattern forming unit of a predetermined shape formed on the surface of the release fabric for realizing a desired texture of leather.

At this time, the forming unit may include a pattern forming roller having a predetermined pattern formed along the outer circumferential surface to realize a desired texture of leather, and the pattern forming roller may include a pattern forming roller, So that the pattern of the predetermined shape is formed on the resin layer.

The forming unit may include an idle roller rotated in contact with the releasing end of the releasing roller in contact with the pattern forming roller, and an idle roller connected to both ends of the rotary shaft of the idle roller and between the idle roller and the pattern forming roller And a pressure holding actuator which maintains a pressure applied to the releasing fabric to be contact-transferred at a predetermined level.

The heating unit may include first heating means provided on the heating roller and an arc-shaped protective curved surface spaced apart from the outer circumferential surface of the heating roller by a predetermined distance, And a control unit that is connected to the spraying unit and detects temperatures of both the side and the middle of the contacted part in real time, And control means for equalizing the temperature of the air injected by the injecting means and making the temperature of the portion where the heating roller and the release mold contact with each other uniform.

The heating unit includes: a second heating unit provided in the casing; a blower provided at one side of the casing and connected to the second heating unit to forcibly feed air heated to the heating roller side; And a plurality of blowing nozzles for blowing the heated air forcedly delivered from the blower to a portion where the release material is in contact with the heating roller, And an injection pipe connected to each other to form an internal flow path.

The control means may include a plurality of temperature sensors arranged to be spaced apart from each other along a portion where the release fabric contacts the heating roller, and a plurality of temperature sensors electrically connected to the temperature sensor, And an electromagnetic valve provided in each of the plurality of injection nozzles for spraying the heated air to the heating roller side and capable of opening and closing the discharge flow rate of the heated air injected through the injection nozzle in an adjustable manner.

The plurality of cooling rollers are arranged along a direction away from the heating unit, and the temperature of each of the plurality of cooling rollers gradually increases along a direction away from the heating unit.

Further, the synthetic leather manufacturing apparatus capable of heating the uniform temperature is characterized in that the inlet side of the heating unit and the outlet side of the heating unit between the heating unit and the cooling unit are arranged along the direction in which the release fabric is fed And an air curtain generator for blocking heat input from the outside.

According to the present invention having the above-described configuration, the following effects can be achieved.

First, the present invention is characterized in that a portion including a supply unit, a tension unit, a heating unit, a cooling unit, and a forming unit is heated to a uniform temperature at a portion where the heating roller and the release- .

Particularly, according to the present invention, the temperature deviation across both ends and the middle portion of the heating roller is significantly reduced through the control means of the heating roller, thereby forming a pattern of uniform quality along the direction in which the release fabric is fed, .

FIG. 1 is a conceptual view showing the overall structure of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to an embodiment of the present invention. FIG.
FIG. 2 is a conceptual view showing the overall structure of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to another embodiment of the present invention. FIG.
FIG. 3 is a conceptual view illustrating a detailed structure of a heating unit and a peripheral portion thereof, which are main components of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to an embodiment of the present invention.
FIG. 4 is a plan view schematically showing the point A of FIG. 3, and shows a portion where the heating roller is contacted according to the direction in which the release fabric is fed,

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments described below, but may be embodied in various other forms.

The present embodiments are provided so that the disclosure of the present invention is thoroughly disclosed and that those skilled in the art will fully understand the scope of the present invention.

And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

In addition, throughout the specification, like reference numerals refer to like elements, and the terms (mentioned) used herein are intended to illustrate the embodiments and not to limit the invention.

In this specification, the singular forms include plural forms unless the context clearly dictates otherwise, and the constituents and acts referred to as " comprising (or having) " do not exclude the presence or addition of one or more other constituents and actions .

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a conceptual view showing the overall structure of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to an embodiment of the present invention. FIG. 2 is a schematic view of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to another embodiment of the present invention. And FIG.

3 is a conceptual diagram illustrating a detailed structure of a heating unit and a peripheral portion thereof, which are major components of a synthetic leather manufacturing apparatus capable of heating a uniform temperature according to an embodiment of the present invention.

FIG. 4 is a plan view schematically showing a point A of FIG. 3, and is a view showing a region where the heating roller is contacted according to the direction in which the release fabric is fed, by sector.

It can be understood that the present invention is a structure including the supply unit 100, the tension unit 200, the heating unit 300, the cooling unit 400, and the forming unit 500 as shown in FIG.

The supply unit 100 is for transferring the release fabric 700 formed with the resin layer 800 by a synthetic resin coated to a predetermined thickness in one direction. In the present invention, the dry, wet, And so on.

The tension unit 200 is disposed along the direction in which the release fabric 700 is conveyed to guide the release fabric 700 to maintain a certain degree of tension. And the surface of the resin layer 800 applied to the release fabric 700, and can be formed by known rollers. Therefore, the detailed description and the operation mechanism will be omitted.

The heating unit 300 includes a heating roller 301 to allow the release rollers 301 to contact the release rollers 700 in a heated state and at the same time to rotate the heating rollers 301 and the release rollers 700, The air heated at a predetermined temperature is sprayed over an area corresponding to the contacted portion.

The cooling unit 400 includes a cooling roller 401 and contacts the release fabric 700 passing through the heating unit 300 to cool the release fabric 700 and the resin layer 800, In one direction.

The forming unit 500 is for forming a uniform pattern on the resin layer 800.

Therefore, the portion where the heating roller 301 and the release fabric 700 are in contact with each other is heated to a uniform temperature, so that a uniform quality synthetic leather product can be produced.

Particularly, according to the present invention, it is possible to realize a desired natural leather effect by forming a uniform quality pattern along the feeding direction of the release fabric 700 by significantly reducing the temperature deviation across both ends and the middle portion of the heating roller 301 .

It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention.

The release fabric 700 may be a release paper or a nonwoven fabric, and is preferably recyclable several times in order to reduce manufacturing costs and raw material costs.

In the meantime, the present invention includes a synthetic leather 800 'produced by a resin layer 800 separated from a release fabric 700 that has passed through a cooling unit 400, a recovery unit 800' for recovering the release fabric 700 900).

Here, the collecting unit 900 includes a separating cutter 910 for separating the resin layer 800 from the releasing fabric 700, a releasing material removing roller 920 for winding and recovering the releasing fabric 700, And a synthetic leather recovery roller 930 for winding up and recovering the leather 800 '.

1, the forming unit 500 may be a pattern forming unit 501 having a predetermined shape formed on the surface of the release fabric 700 in order to realize the desired texture of the leather.

2, the forming unit 500 may include a pattern forming roller 510 having a predetermined pattern formed along the outer circumferential surface thereof to realize a desired texture of the leather.

The pattern forming roller 510 forms a predetermined pattern on the resin layer 800 while rotating in contact with the resin layer 800 on the release fabric 700 passing through the heating unit 300.

The forming unit 500 includes an idle roller 520 and an idle roller 520 that contact and rotate with the deformed end 700 conveyed in contact with the pattern forming roller 510, And a pressure maintaining actuator 530 connected to both ends of the idler roller 520 and the pattern forming roller 510 to maintain the pressure applied to the releasing end 700 to be contacted between the idler roller 520 and the pattern forming roller 510 to a certain level to be.

3 and 4, the heating unit 300 includes a first heating unit 310, a casing 320, a spraying unit 330, and a control unit 340, .

The first heating unit 310 is provided in the heating roller 301 and is not specifically shown in detail. However, the first heating unit 310 may be in the form of a heat line buried in the heating roller 301 to be electrically operated, The temperature of the heating roller 301 may be increased in various manners such as by flowing a thermal fluid such as steam or oil along the pipe forming the inner flow path to be heated.

The casing 320 has an arc-shaped protective curved surface 321 spaced a certain distance from the outer circumferential surface of the heating roller 301 and covers a portion where the heating roller 301 and the release fabric 700 are in contact with each other.

The spraying means 330 injects heated air to a portion where the spraying means 330 is provided in the casing 320 and is in contact therewith.

The control means 340 is electrically connected to the injection means 330. The control means 340 detects the temperatures of both side portions and the middle portion of the contact portion in real time to equalize the temperature of the air injected by the injection means 330, This is for uniformizing the temperature at the portion where the roller 301 and the release fabric 700 are in contact with each other.

Here, the temperature of the space between the casing 320 and the outer circumferential surface of the heating roller 301 is maintained at 150 ° C to 250 ° C, more preferably 200 ° C.

At this time, if the temperature is lower than 150 DEG C, a desired pattern will not be formed in the resin layer 800, and if the temperature is higher than 250 DEG C, the resin layer 800 is denatured or burned, .

The present invention is also disposed between the supply unit 100 and the heating unit 300 to rotate in contact with the release fabric 700 so that the release fabric 700 supplied from the supply unit 100 is transferred to the heating unit 300 And a preheating roller 302 for preheating the release material 700 to a temperature lower than the temperature heated by the heating unit 300 before being supplied.

The preheating roller 302 is a technical means for reducing the amount of energy consumed by lowering the heating load of the heating unit 300 described above.

Meanwhile, the injection means 330 may include a second heating means 332 provided in the casing 320.

The second heating means 232 is electrically connected to the first heating means 310 such that the heated air can be supplied through the injection pipe 334, which will be described later, by the blower 331, which will be described later, The temperature of the air to be forcedly supplied by the blower 331 can be increased by various methods such as a method of flowing heat fluid such as steam or oil along the pipe forming the inner flow path, will be.

The injection means 330 may include a blower 331 provided at one side of the casing 320 and connected to the second heating means 332 for forcibly feeding the heated air toward the heating roller 301 .

The blowing unit 330 is connected to the blower 331 and is disposed in a plurality of positions spaced apart from the protective curved face 321 so that the heated air forcedly blown from the blower 331 is heated by the heating roller 301 And a spray nozzle 333 for spraying the spray nozzle 333 onto a portion to be contacted with the spray nozzle 333.

In this case, the injection nozzles 333 are arranged at predetermined intervals along the direction orthogonal to the direction in which the release material 700 is conveyed, so that the uniformity of the temperature distribution can be increased.

The injection means 330 may include an injection pipe 334 for interconnecting the blower 331 and the injection nozzle 333 and forming an internal flow path.

The heating unit 300 is provided at one side of the casing 320 for recycling the heated air discharged from the jetting nozzle 333 and has a negative pressure for recovering the heated air jetted toward the heating roller 301 (Not shown).

The heating unit 300 further includes a reservoir tank 360 provided at one side of the casing 320 for temporarily recycling the recovered air for recycling the heated air discharged from the spray nozzle 333 .

The heating unit 300 is disposed between the reservoir tank 360 and the spray pipe 334 for recycling the heated air discharged from the spray nozzle 333 and filters the foreign substances contained in the recovered air (370). ≪ / RTI >

On the other hand, the control means 340 includes a plurality of temperature sensors 341 arranged to be spaced apart from each other in contact with the heating rollers 301.

The control means 340 is electrically connected to the temperature sensor 341 and constitutes the injecting means 330 and is provided for each of the plurality of injection nozzles 333 for injecting heated air toward the heating roller 301 And an electromagnetic valve 342 capable of regulating opening and closing of the discharge flow rate of the heated air injected through the injection nozzle 333.

The adjustment of the degree of opening and closing of the electromagnetic valve 342 is required to increase the pressure or volume value in proportion to the temperature change when the temperature is constant (pressure x volume) .

That is, PV = RT (pressure × volume = gas constant × temperature), that is, T = PV / R (temperature = (pressure × volume) / gas constant).

More specifically, the portion where the deformed fabric 700 contacts the heating roller 301 is divided into both side portions and an intermediate portion of the heating roller 301, and one side portion of both sides of the heating roller 301 is divided into a first sector 301a The other side of the both sides of the heating roller 301 may be defined as the second sector 301b and the middle part of the heating roller 301 may be defined as the third sector 301c.

Accordingly, when the temperature difference between the first, second, and third sectors 301a, 301b, and 301c becomes greater than a predetermined range according to the measured value of the temperature sensor 341 sensed in real time, The uniformity of the temperature distribution over the portion where the heating roller 301 and the release fabric 700 are in contact with each other can be improved to produce a uniform quality synthetic leather product.

The present invention is characterized in that the inlet side of the heating unit 300 and the outlet side of the heating unit 300 between the heating unit 300 and the cooling unit are disposed along the direction in which the release fabric 700 is conveyed, It is of course also possible to apply an embodiment having an air curtain generator 380 for blocking heat input from the air curtain generator 380.

The air curtain generator 380 generates high pressure air from the left end of the casing 320, which is the left side in Fig. 3, on the inlet side of the heating unit 300, i.e., the heating roller 301, And is sprayed toward the stratum 800, it is possible to prevent the inflow of heat or heat leakage from the outside, thereby helping to produce uniform quality products.

3, the air curtain generator 380 generates high-pressure air from the right end of the casing 320, which is the right side in Fig. 3, on the exit side of the heating unit 300, To the resin layer 800 of the resin layer 800, heat input or heat outflow from the outside is fundamentally blocked, thereby helping to produce a uniform quality product.

The plurality of cooling rollers 401 are arranged in a direction away from the heating unit 300 so that the temperature of each of the plurality of cooling rollers 401 is gradually increased along the direction away from the heating unit 300 , It will be possible to prevent deformation of the surface of the resin layer 800 due to abrupt cooling.

Hereinafter, a process for producing synthetic leather using the synthetic leather manufacturing apparatus capable of heating the uniform temperature according to various embodiments of the present invention will be briefly described.

First, the operator forms a resin layer 800 by applying a synthetic resin to the release fabric 700 to a predetermined thickness.

Thereafter, the release material 700 on which the resin layer 800 is formed is conveyed in one direction, the release material 700 conveyed in one direction is brought into contact with the heating roller 301 to be conveyed in a heated state, The air heated to a predetermined temperature is sprayed over an area corresponding to a portion where the release mold 301 and the release mold 700 are in contact with each other.

Subsequently, the release material 700 having passed through the heating roller 301 is contacted with the cooling roller 401, and the release material 700 is transferred in one direction while cooling the resin layer 800.

Next, the synthetic leather 800 'produced by the resin layer 800 separated from the release fabric 700 passing through the cooling roller 401 and the release fabric 700 are recovered, respectively.

Here, in order to realize the desired texture of the leather, the resin layer 800 may be formed by coating a synthetic resin with a predetermined thickness on the release fabric 700 having a predetermined pattern forming portion.

At this time, in order to realize a desired texture of the leather, the release fabric 700 having passed through the heating roller 301 is brought into contact with the pattern forming roller 510 having the predetermined pattern along the outer peripheral surface, It is also possible that the release material 700 is transferred in one direction while the resin layer 800 is cooled by the cooling roller 401 which is brought into contact with and rotated together with the pattern formation roller 510.

As described above, according to the present invention, a uniformly high-quality synthetic leather product can be obtained by uniformly heating a predetermined size surface of a release fabric along a supplied direction, It is understood that it is the basic technical idea to provide.

It will be apparent to those skilled in the art that many other modifications and applications are possible within the scope of the basic technical idea of the present invention.

100 ... supply unit
200 ... tension unit
300 ... heating unit
301 ... heating roller
301a ... first sector
301b ... second sector
301c ... third sector
302 ... preheating roller
310 ... first heating means
320 ... casing
321 ... protective surface
330 ... injection means
331 ... blower
332 ... second heating means
333 ... injection nozzle
334 ... injection pipe
340 ... control means
341 ... Temperature sensor
342 ... electromagnetic valve
350 ... suction pump
360 ... reservoir tank
370 ... filter
400 ... cooling unit
401 ... cooling roller
500 ... forming unit
501 ... pattern forming portion
510 ... pattern forming roller
520 ... idler rollers
530 ... pressure maintaining actuator
700 ... Distinguishing fabric
800 ... resin layer
800 '... Synthetic leather
900 ... collection unit
910 ... separator cutter
920 ... Release fabric rollers
930 ... synthetic leather recovery roller

Claims (9)

A supply unit for transferring a release fabric having a resin layer formed by a synthetic resin applied to a predetermined thickness in one direction; A tension unit disposed along a direction in which the release material is conveyed to guide the release material to maintain a predetermined tension; Wherein the heating roller is brought into contact with the heating rollers so that the heating rollers contact the heating rollers in a heated state and at the same time the air heated to a predetermined temperature over an area corresponding to a portion where the heating rollers and the release- A heating unit for spraying; A cooling unit including a cooling roller, a cooling unit for contacting the release fabric having passed through the heating unit and cooling the release fabric and the resin layer while transferring the release fabric in one direction; And a forming unit for forming a predetermined pattern on the resin layer, wherein a portion where the heating roller and the release material contact each other is heated to a uniform temperature,
The forming unit includes:
Wherein the pattern forming portion is a predetermined pattern forming portion formed on a surface of the release fabric so as to realize a desired texture of the leather.
delete delete The method according to claim 1,
The forming unit includes:
And a pattern forming roller having a predetermined pattern formed along the outer circumferential surface in order to realize a desired texture of the leather, wherein the pattern forming roller rotates in contact with the resin layer on the deformed original passed through the heating unit, And the pattern of the predetermined shape is formed on the substrate,
An idle roller that rotates in contact with the deformed fabric conveyed in contact with the pattern forming roller,
Further comprising a pressure maintaining actuator connected to both end portions of the rotary shaft of the idle roller and maintaining a pressure applied to the releasing end portion contacted between the idle roller and the pattern forming roller at a predetermined level, A possible synthetic leather manufacturing device.
The method according to claim 1,
The heating unit includes:
A first heating means provided on the heating roller,
A casing having an arc-shaped protective curved surface spaced apart from the outer circumferential surface of the heating roller by a predetermined distance and surrounding a portion where the heating roller and the release fabric are in contact with each other;
A spraying means provided in the casing for spraying the heated air to the contacted portion,
Wherein the heating roller is electrically connected to the spraying means and detects the temperature of both side portions and the middle portion of the contacting portion in real time to equalize the temperature of the air injected by the spraying means, And a control means for controlling the temperature of the portion to be uniform.
The method of claim 5,
The heating unit includes:
Second heating means provided in the casing,
A blower provided at one side of the casing and connected to the second heating means for forcibly feeding air heated to the heating roller side,
A spray nozzle connected to the blower so as to be spaced apart from the protective curved surface so that the heated air forcedly transferred from the blower is sprayed onto a portion where the release fabric contacts the heating roller;
Further comprising an injection pipe for interconnecting the blower and the injection nozzle and forming an internal flow path.
The method of claim 5,
Wherein,
A plurality of temperature sensors disposed apart from each other along a portion where the release fabric contacts the heating roller,
And a plurality of nozzles which are electrically connected to the temperature sensor and constitute the jetting means and are respectively provided in a plurality of jetting nozzles for jetting the heated air to the heating roller side and the discharge flow rate of the heated air jetted through the jetting nozzles Wherein the electromagnetic valve is adjustable to open and close the electromagnetic valve.
The method according to claim 1,
The cooling roller
A plurality of heaters arranged in a direction away from the heating unit,
Wherein the temperature of each of the plurality of cooling rollers gradually increases along a direction away from the heating unit.
The method according to claim 1,
In the synthetic leather manufacturing apparatus capable of heating the uniform temperature,
An air curtain generator disposed at the inlet side of the heating unit along the direction in which the release fabric is fed and the air curtain generator disposed at the outlet side of the heating unit between the heating unit and the cooling unit, Wherein said heating means is capable of heating at a uniform temperature.

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