KR101402747B1 - Multi-layered pet sheet and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a multilayer PET sheet and a manufacturing method thereof. The method for manufacturing a PET sheet comprises the steps of extruding a multilayer PET layer (41), which includes a first layer (411) and a second layer (412) composed of two different PET materials, from a multilayer extruder; and molding a sheet while simultaneously heat-bonding decoration films (51, 52) on the reverse side of the extruded multilayer PET layer (41). Accordingly, the highly glossy decoration PET sheet having the decoration films with a pattern on the reverse side is manufactured in a multilayer structure by using polyethylene terephthalate glycol (PET G) and polyethylene terephthalate antistatic (PET A). Therefore, a highly glossy decoration PET sheet having high economical efficiency and an antistatic function can be provided.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-

The present invention relates generally to a polyethylene terephthalate (PET) sheet and a method of manufacturing the same. More particularly, the present invention relates to a high gloss decorating PET sheet having a decoration film engraved with a pattern on its back surface, wherein the PET sheet is made of polyethylene terephthalate glycol (PET G) and polyethylene terephthalate antistatic (PET A) to provide a high gloss decorative PET sheet having high economic efficiency and antistatic function, and a method for manufacturing the same .

In the conventional manufacturing of lumber, a method of expressing a pattern on the surface of the sheet is adopted. When the sheet of this type is attached to furniture or the like, it is necessary to periodically clean the sheet by putting foreign matter on the pattern represented on the surface. In addition, since the pattern is exposed to the outside, there is a problem that there is a great concern about wear and damage.

In order to solve such a problem, for example, as described in a registration document of "Patent Sheet and Manufacturing Technology" of Patent Registration No. 10-0816300 (registered on September 2, 2008), a decoration film having an embossed pattern is coated with transparent PET A PET sheet for protecting the pattern from abrasion and damage while keeping the pattern clearly is formed by forming the PET sheet on the back surface of the sheet, and a manufacturing method thereof has been proposed.

However, since the conventional PET sheet uses polyethylene terephthalate glycol (PET G) as a raw material resin, it is very expensive and the consumption layer is limited, and there are various problems due to high static electricity generation rate.

Therefore, there is still a technical demand for a new PET sheet and a manufacturing method thereof that can reduce the cost of the high-gloss-decorating PET sheet while preventing the generation of static electricity.

It is an object of the present invention to overcome the problems of the prior art and to provide various additional advantages. In particular, the present invention relates to a high gloss decorating PET sheet on which a decorative film with a pattern on its back is formed, Layer PET sheet, which can provide a high-gloss decorative PET sheet having high economic efficiency and antistatic function by being produced as a multilayer using polyethylene terephthalate antistatic (PET A) and polyethylene terephthalate antistatic (PET A) The purpose is to provide.

The above object is achieved by a multilayer PET sheet provided according to the present invention and a method of manufacturing the same.

A multi-layer PET sheet provided according to an aspect of the present invention is a multi-layer PET sheet formed by adhering a decorative film and a polyethylene terephthalate (PET) layer having a pattern on a back surface, wherein the PET layer is made of polyethylene terephthalate glue And a second layer made of polyethylene terephthalate antistatic (PET A) laminated on at least one side of the first layer and a first layer made of Coke (PET G).

In one embodiment, the first layer may be 85 to 90 wt% and the second layer may be 10 to 15 wt% with respect to a unit area of the PET layer.

In another embodiment, the PET layer may comprise a double layer in which the first layer is laminated on the front side thereof and the second layer is laminated between the first layer and the decorating film.

In another embodiment, the PET layer is formed by laminating two second layers respectively on the surface and the side adjacent to the decorating film, and between the two second layers, the triple layer Layer.

In still another embodiment, the decorating films 51 and 52 may include at least one flat flat film, a three-dimensional flat film, and a paper film.

In another aspect of the present invention, there is provided a method for producing a PET sheet, comprising the steps of: forming a multi-layered PET layer comprising a first layer and a second layer of two different PET materials, Extruding from a ray extruder; And a step of thermally adhering a decoration film to the back surface of the multilayer PET layer to be extruded and molding the same into a sheet.

In one embodiment, the PET layer comprises a first layer of polyethylene terephthalate glycol (PET G) and a second layer of polyethylene terephthalate antistatic (PET A) laminated on at least one side of the first layer. Layer by a multi-ray extruder so as to contain the layer.

In another embodiment, the multi-ray extruder extrudes a first raw material containing polyethylene terephthalate glycol (PET G) as the main raw material and a second raw material containing polyethylene terephthalate antistatic (PET A) as the main raw materials, respectively , The extruded first raw material and the second raw material are distributed in a predetermined weight ratio using a gear pump and discharged from a T-shaped die, whereby a first layer made of polyethylene terephthalate glycol (PET G) Layer PET layer comprising a second layer made of polyethylene terephthalate antistatic (PET A) laminated on at least one side of the PET layer.

In another embodiment, the predetermined weight ratio at which the first raw material and the second raw material that are extruded from the multi-layer extruder are distributed is 85 to 90% by weight with respect to the unit area of the PET layer, And the second layer may be composed of 10 to 15% by weight.

In yet another embodiment, the method may further include forming a protective film on a surface of the PET layer molded with the sheet, after forming the sheet; Cutting the sheet to a predetermined width; A step of sucking and discharging foreign matters including dust while the sheet is being cut around the sheet to be cut; Applying a primer as an adhesion promoter to the surface of the decorating film of the sheet and drying the applied coating; Laminating a protective tape on the surface of the primer layer; And a step of cutting the sheet into a predetermined length and winding the sheet while generating negative ions in order to prevent the sheet from having a correcting unit.

The PET sheet of the present invention having the above-mentioned constitution and the method of producing the same is a high gloss decorating PET sheet on which a decoration film with a pattern on its back is formed. The PET sheet is made of polyethylene terephthalate glycol (PET G) and polyethylene terephthalate (PET A) as a multilayer, it is possible to provide a high-gloss decorative PET sheet having high economic efficiency and antistatic function.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a resin compounding and dehumidifying process in a PET sheet production process according to the present invention. FIG.
2 is a view for explaining a laminating process of a PET layer and a decorating film in a PET sheet manufacturing process according to the present invention.
3 is a view for explaining a subsequent step in the process of producing a PET sheet according to the present invention.
4 is a view for explaining a subsequent process in a PET sheet manufacturing process according to the present invention.
5 is a schematic view illustrating, by way of example, a cross-section of a PET sheet according to the present invention.
6 is a schematic diagram illustrating another cross-section of a PET sheet according to the present invention.
7 is a view for explaining a cutting and winding process in a PET sheet manufacturing process according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the embodiments described herein are for illustrative purposes only and are not intended to limit the invention to the embodiments described.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a resin compounding and dehumidifying process during a PET sheet manufacturing process according to the present invention.

As shown in the figure, the PET resin raw material is first added to the blender 10 to be blended. The main raw material for the resin raw material may be two different PET resins, and preferably polyethylene terephthalate glycol (PET G) and polyethylene terephthalate antistatic (PET A).

The two different PET resins are respectively blended in two different compounders 10. In each compounding machine, in addition to the PET resin raw material, flame retardant, flame retardant, and flame retardant additive may be further added.

Normally, polyethylene terephthalate glycol (PET G) is a PET resin material which is excellent in transparency and strength and is suitable for protecting decoration film in embossed form. However, since the price is relatively high, there is a disadvantage that the price of the finished product rises and the consumer can be limited.

On the other hand, polyethylene terephthalate antistatic (PET A) has the advantage of being very inexpensive, especially anti-static, than PET G.

In particular, the PET layer formed by the PET resin in the present invention is formed into a multilayer including a layer made of polyethylene terephthalate glycol (PET G) and a layer made of polyethylene terephthalate antistatic (PET A). According to this structure and structure, the price of the PET sheet can be produced inexpensively, and the manufacturing process can be facilitated by including the antistatic function.

Each of the PET resin materials blended in the two blenders 10 is supplied to the dehumidifier 10 through the two different pipes 15 connected to the upper side of two different dehumidifiers 20 through the lower portion of each blender 10, (Hopper) 20, respectively. A vacuum pump is connected to the pipe 15 so that the respective resin materials can be moved from the two compounders 10 to the two dehumidifiers 20 by the suction force of the vacuum pump.

In each dehumidifier 20, dehumidification is performed by high temperature and dried, and the dehumidification amount is about 150 kg / hour. This dehumidification amount can be further increased, for example up to 400 kg / hour.

Fig. 2 is a view for explaining the laminating process of the PET layer and the decoration film, following the process shown in Fig. 1, in the PET sheet manufacturing process according to the present invention.

As shown in the drawing, the PET resin raw material dehumidified through the dehumidification process is melted and extruded in the multi-ray extruder 30. The multi-ray extruder 30 receives two different PET resin raw materials from two different dehumidifiers 20 and adjusts the temperature to, for example, about 230 to 265 ° C To melt in the liquid state and then extrude the PET resin raw materials as multiple layers of double or triple layers at the downstream end.

The PET resin raw materials extruded from the multi-ray extruder 30, that is, the first raw material and the second raw material, flow into the T-shaped die 40. Apparatuses are arranged between the multi-beam extruder 30 and the T-shaped die 40 so that the first raw material and the second raw material are distributed and lapped in a predetermined weight ratio. That is, the first raw material and the second raw material that are extruded from the multi-ray extruder 30 are distributed in a predetermined weight ratio using a gear pump (not shown) and are combined as a double layer or a triple layer in a feeder block (not shown) 40).

This results in a multilayer PET layer comprising a first layer of a first raw material such as polyethylene terephthalate glycol (PET G) and a second layer of a second raw material such as polyethylene terephthalate antistatic (PET A) 41 may be formed at the rear end of the T-shaped die 40.

The predetermined weight ratio at which the first raw material and the second raw material are distributed is set such that the first layer of the first raw material 411 (100% by weight) ) May be 85 to 90% by weight and the second layer 412 of the second raw material may be 10 to 15% by weight.

Referring again to FIG. 2, the T-shaped die 40 is a passive discharge amount regulating device, which is made of a single PET layer 41 at a predetermined pressure, and a PET raw material in which a first raw material and a second raw material are distributed in a predetermined weight ratio, So as to be discharged. The width of the PET layer 41 to be discharged may be about 1,550 mm. The T-shaped dice 40 may also be constructed so that the inside thereof is constituted by five parts and pressure can be applied stepwise.

On the other hand, in the illustrated example, the fabric film 51 and the three-dimensional fabric film 52 are supplied from two rollers disposed in the fabric decorating film introducing apparatus 50, for example, a fabric roller and a three- roller 60). The fabric decorating film feeding device 50 is a kind of tension machine that feeds the fabric film 51 and the three-dimensional fabric film 52 to the lamination roller 60 while maintaining a constant smoothness.

The lamination roller 60 is formed by thermally adhering the decoration film 51 supplied from the far-end decoration film introducing device 50 to one surface, that is, the back surface, of the multilayer PET layer 41 discharged from the T- And then the thickness and the surface gloss can be adjusted by cooling.

As shown in the drawing, the lamination roller 60 can be preferably composed of three rollers, that is, a first roller to a third roller 61, 62 and 63. The PET layer 41 and the decoration As the films 51 and 52 pass, they are thermally adhered to each other. To this end, the first roller 61 and the second roller 62 are heated to about 180 캜. The PET layer 41 discharged from the T-shaped die 40 may have a temperature of about 200 ° C.

The PET sheet 41, which is thermally adhered while passing between the first roller 61 and the second roller 62, and the decoration film 51, 52 are cooled to some extent, but the second roller 62, And the third roller (63). To this end, the third roller 63 may be maintained at a temperature of about 80 캜.

The thickness of the PET sheet flowing out to the rear end of the lamination roller 60 may be maintained at about 0.25 to 2.0 mm. The surface gloss of the PET sheet can be adjusted while the PET sheet is pressed and heated and cooled while passing through the lamination roller 60.

The protective film 71 supplied from the protective film feeder 70 can be adhered to the other surface, that is, the surface, of the PET sheet thermally adhered by the lamination roller 60 and having a controlled thickness. The protective film 71 may be, for example, a UV transfer film that is transferred using ultraviolet rays, and may serve to improve the gloss while protecting the surface of the PET layer 41 from the outside.

The protective film supply device 70 may be configured to supply the protective film 71 with a predetermined tension to the transfer device 80 as in the case of the far-end decoration film loading device 50. [

The protective film 71 is thermally adhered again on the PET sheet (the state in which the PET layer 41 and the decoration films 51 and 52 are thermally adhered) in the transfer device 80.

The transfer device 80 is composed of two rollers, upper and lower, as shown in the figure. The upper roller is a high-temperature silicone roller, which usually maintains 165 ° C. The lower roller is preferably a metallic roller, the surface of which is embossed with embossing. The decorating films 51 and 52 adhered to the lower portion of the PET sheet are disposed on the upper portion of the lower roller so that when the lower roller is squeezed by the upper roller, the embossing pattern engraved on the lower roller is transferred to the decoration film .

The PET sheet passed through the transfer device 80 is then adjusted in sheet width by the sheet width adjusting device 90. That is, usually, the sheets are conveyed at a width of about 1,500 mm and cut into sheets having a certain width, for example, 1220 mm.

The width-cut sheet may then be transferred to the length adjuster 100 and cut to a certain length, for example 2440 mm.

FIG. 3 is a view for explaining a subsequent process subsequent to the processes shown in FIG. 2 during a PET sheet manufacturing process according to the present invention.

As shown in the drawing, a length adjusting operation sensor 110 is provided at a rear end of the length adjusting device 100, so that when a predetermined length signal is input to a main controller (not shown), the length adjusting device 100 automatically cuts .

At the rear end of the length-adjusting operation sensor 110, a stacking and packaging space 120 for stacking and chopping a sheet cut at a predetermined length in the length adjusting device 100 is disposed. A roller 121 is provided at a predetermined position in the space to allow the sheet conveyed from the length adjusting device 100 and the length adjusting operation sensor 110 to automatically flow into the stacking and packaging space 120.

Here, in the case of a general product, sheets are wound in 100M units. Therefore, the length adjuster 100, the length adjusting operation sensor 110, and the stacking and packing space 120 described above are not limited to products requiring cutting in a certain length, that is, special products such as HPM and LPM Do not use it.

As described above, assuming a general product production process, the sheet passed through the sheet width adjusting device 90 is passed through the protective tape laminating device 130 for forming. The forming protective tape laminating device 130 is a device for laminating a tape to the top of the sheet to prevent the sheet from being deformed when heat or the like is applied thereto.

As described above, the sheet to which the protective tape for molding is laminated is conveyed to the primer processing apparatus 140. In the primer processing apparatus 140, a primer (adhesion promoter) is applied to the lower surface of the product by a metal roller 142 at a constant pressure without damaging the surface of the product with a compression roller 141 such as silicone . At this time, the pressure applied to the product through the compression roller 141 may preferably be 5 mg / cm 2.

As can be seen from the figure, it is seen that the lower metal roller 142 is immersed in the container containing the primer in the lower part of the product and the primer is applied to the lower surface of the product by the rotation of the roller. The sheet coated with the primer is then transferred to the primary drying apparatus 150. In the drying apparatus 150, as shown in the drawing, a blowing device is disposed at a lower portion of the drying apparatus 150 so that only the wind is blown toward the product in the lower direction of the product without heat treatment. In the drawing, the arrow indicates that wind is blown out from the blowing outlet. In this way, the product coated with the primer is firstly dried.

FIG. 4 is a view for explaining a subsequent process subsequent to the processes shown in FIG. 3 during a PET sheet manufacturing process according to the present invention.

As can be seen in the drawing, the primarily dried sheet is conveyed to the secondary drying unit 160 via the cutting device 190. The cutting device 190 will be described later. The secondary drying apparatus 160 includes a heater 161 and a blower 162. The heater is a constant temperature device that cancels the sudden temperature change due to the season, thereby supplying and maintaining a constant temperature to the sheet. When the work chamber is lowered to 7 to 8 ° C, there is a possibility that defects may occur during the working process. Therefore, it is necessary to always maintain the temperature at 15 ° C or more. The heater 161 is separated by about 20 cm from the product, Keep the temperature. The air blowing device 162 is preferably installed in the lower part of the heater in the form of a fan so that the heat of the heater is blown to the sheet product to dry the sheet product secondarily.

At the rear end of the secondary drying apparatus 160, a sheet length detecting sensor 170 and a sheet winding apparatus 180 are disposed. The sheet length detecting sensor 170 is connected to the sheet take-up device 180 to measure the length of the product. When a predetermined length of sheet product is wound on the sheet winding device 180, the sheet product is sensed and transferred to the cutting device 190, and the cutting device 190 cuts the sheet product to a predetermined length. The sheet take-up device 180 is wound with a predetermined length, usually about 100 M, and the take-up device also maintains the tension of the product to be constant.

FIGS. 5 and 6 are views illustrating exemplary PET sheets according to the present invention manufactured through the above-described processes. As described above, in the PET sheet according to the present invention, a PET layer 41 composed of multiple PET yarns containing two different PET resin materials at the center is disposed, a protective film 71 is provided on the upper surface of the sheet, It can be seen that decoration films 51 and 52 are formed. As can be seen from the figure, it can be seen that the decoration film has a relief pattern formed on the surface of the lower roller of the transfer device transferred.

5 illustrates a dual layer PET layer 41 in which the surface-protective film 71 of the PET layer 41 may be laminated-the first layer 411 is laminated to the first layer 411 And the second layer 412 are laminated between the decorative film 51 and the decorative film 51. In this case, the weight ratio per unit area of the first layer 411 made of PET G is about 90% by weight, and the weight ratio of the second layer 412 made of PET A per unit area is about 10% by weight.

On the other hand, FIG. 6 illustrates a triple layer PET layer 41, in which the surface-protective film 71 of the PET layer 41 can be laminated-on the side adjacent to the side and decoration films 51 and 52 It can be seen that each of the two second layers 412 is laminated and the first layer 411 is laminated between the two second layers 412. In this case, the first layer 411 made of PET G has a weight ratio per unit area of about 85% by weight, the two second layers 412 made of PET A have a weight ratio of about 7.5% The number of the second layers 412 may be about 15% by weight.

Here, the decoration films 51 and 52 may be provided with at least one flat fabric film on which patterns are printed, a three-dimensional fabric film in which patterns are expressed in embossing or the like, or a paper film.

7 is a view showing an edge product cutting apparatus of the PET sheet production apparatus according to the present invention. Edge cutting device refers to a device that cuts sheets (original rolls) produced through a decoration laminating device by cutting thinly to a certain width and winding them. Usually it is thinned to 18mm, 21mm, 28mm or 33mm.

The product wound on the sheet winding apparatus shown at 180 in Fig. 4 is conveyed to the cutting roller 210 and the sheet take-up roller 220 via the sheet length detecting sensor 200. The sheet length detecting sensor 200 is connected to the rear cutting roller 210 and the sheet take-up roller 210 to sense a predetermined length of the product when the sheet is taken up by the sheet take-up roller 220, Cut it. The cutting roller 210 cuts the sheet (the original roll) into a plurality of pieces at a predetermined width. It can be seen that the sheet take-up roller 220 is arranged up and down with respect to the cutting roller 210, as shown in the figure. This is to prevent the product from overlapping with neighboring edge products since the product is slightly cut and wound.

As described above, by carrying out the present invention, a protection film such as UV is placed on the upper surface of the lamination resin material (PETG), a decoration film is formed on the lower surface of the lamination resin raw material (PETG) So that the embossed pattern was transferred to the decoration film. Therefore, a high-gloss sheet can be realized, and the decoration film is disposed on the lower surface of the product, so that the depth feeling of the product is increased.

Particularly, according to the present invention, there is provided a high gloss decorating PET sheet in which a protective film can be placed on the surface and a decoration film having a pattern on the back is formed, wherein the PET sheet is made of polyethylene terephthalate glycol (PET G) and polyethylene terephthalate antiste (PET A) as a multilayer, it is possible to provide a high-gloss decorative PET sheet having high economic efficiency and antistatic function.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Therefore, it should be pointed out that the scope of the present invention is not limited to the described embodiments, but should be construed according to the appended claims.

41: PET layer
411: 1st floor
412: Second layer
51, 52: Decoration film
71: Protective film

Claims (10)

(EN) A multi-layer PET sheet in which decorating films (51, 52) and a polyethylene terephthalate (PET) layer (41) And a second layer 412 made of a polyethylene terephthalate antistatic (PET A) laminated on at least one side of the first layer 411 and a first layer 411 made of PET Features multi-layer PET sheet. The first layer 411 is 85 to 90% by weight and the second layer 412 is 10 to 15% by weight based on the unit area of the PET layer 41. [ Layer PET sheet. The method of claim 1, wherein the PET layer (41) is formed such that the first layer (411) is laminated on the surface side thereof and the second layer (412) is formed between the first layer (411) Layered PET sheet. The decorative sheet of claim 1, wherein the PET layer (41) has two second layers (412) laminated on the surface thereof and adjacent to the decoration films (51, 52) And the first layer (411) is laminated on the first layer (411). The multi-layer PET sheet according to claim 1, wherein the decoration films (51, 52) comprise at least one of a flat raw film, a three-dimensional raw fabric film and a paper film. delete A method of producing a PET sheet,
Layer PET layer 41 having a first layer 411 made of polyethylene terephthalate glycol (PET G) and a second layer 412 made of polyethylene terephthalate antistatic (PET A) Extruding from an extruder; And
And thermally adhering the decoration films (51, 52) to the back surface of the multilayer PET layer (41) to be extruded and molding them into a sheet,
The PET layer 41 is formed by discharging from the T-shaped die by the multi-layer extruder so as to include a second layer 412 laminated on at least one side of the first layer 411. The multi- / RTI > [7] The multi-ray extruder according to claim 7, wherein the multi-ray extruder extrudes a first raw material mainly composed of polyethylene terephthalate glycol (PET G) and a second raw material mainly composed of polyethylene terephthalate antistatic (PET A) The extruded first raw material and the second raw material are distributed in a predetermined weight ratio using a gear pump and are discharged from a bite T-shaped die together in a feeder block to form a first layer made of polyethylene terephthalate glycol (PET G) Layer PET layer 41 including a second layer 412 made of polyethylene terephthalate antistatic (PET A) laminated on at least one side of the first layer 411 and a second layer 412 made of polyethylene terephthalate antistatic (PET A) Lt; / RTI > PET sheet. [8] The method of claim 8, wherein the predetermined weight ratio of the first raw material and the second raw material that are extruded from the multi-layer extruder is selected such that the first layer (411) % And the second layer (412) is composed of 10 to 15% by weight. 8. The method of claim 7, wherein after forming the sheet,
Forming a protective film on a surface of the PET layer molded with the sheet;
Cutting the sheet to a predetermined width;
A step of sucking and discharging foreign matters including dust while the sheet is being cut around the sheet to be cut;
Applying a primer, which is an adhesion promoter, to the surface of the decoration film (51, 52) of the sheet and drying the same;
Laminating a protective tape on the surface of the primer layer; And
Further comprising the step of cutting and winding up a predetermined length of the sheet while generating negative ions in order to prevent the formation of a correcting unit of the sheet.

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