KR20150075948A - Method for bonding and embossing of the biodegradable resin sheets having excellent impact strength - Google Patents

Abstract

The present invention provides an embossing processing method of a biodegradable sheet, including the steps of: manufacturing a print sheet with a print layer formed on a first biodegradable sheet and a second biodegradable sheet; stacking the first biodegradable sheet on the print layer of the print sheet to have the same pass through a compression roller; passing the stacked sheet body through the compression roller into a drum roller while heating the same with use of an upper heater installed on the upper end of the drum roller, and melting and laminating the stacked sheet body; and heating the melted and stacked sheet with use of a heater installed on the front surface, passing the laminated sheet into an elbow roller and making the same embossed wherein the first and second biodegradable sheets include 40-100 parts by weight of acrylio butadiene styrene (ABS) with respect to 100 parts by weight of each biodegradable resin, thereby easily laminating the biodegradable sheet while forming embossed sheet with good impact strength.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for embossing a biodegradable sheet having excellent impact strength,

The present invention relates to a method for embossing a biodegradable sheet, and more particularly, to a method for embossing a biodegradable sheet, which is capable of not only easily laminating a biodegradable sheet but also simultaneously performing an embossing process, To a method of embossing.

Generally, synthetic resin, which is a polymer compound obtained by artificially synthesizing raw materials such as coal, petroleum, and natural gas, which is a fossil fuel, has characteristics such as workability, strength, hardness, corrosion resistance, weather resistance, water resistance, durability, And is widely used in various fields.

However, in spite of the above excellent properties, the synthetic resin is not decomposed in the natural state, so that serious environmental pollution is caused in the disposal of various products applied thereto, and due to exhaustion of fossil fuels, Is gradually decreasing or limiting the trend. In addition, imports and exports are prohibited for some products, and the development of materials that can replace synthetic resins due to price increases of synthetic resin materials due to high oil prices has been urgently needed.

As a material to replace the polymer synthetic resin having the above-mentioned problems, there is a biodegradable resin using various grains that can be easily obtained from the surroundings. Examples of the biodegradable resin include polylactic acid (PLA), polyglycolic acid (PGA), poly caprolactone (PCL), aliphatic polyester resin, polyhydroxybutyric acid polyhydroxy butyric acid (PHB), and D-3-hydroxy butyric acid.

On the other hand, various sheets such as a marking sheet, an interior sheet, a decoration sheet, a signboard, an indoor / outdoor decorative sheet and the like are widely used due to dimensional stability, weather resistance, chemical resistance, surface glossiness, scratch resistance and ease of processing.

Generally, the various sheets described above are made of synthetic resin. These sheets are mainly made of vinyl chloride resin, rubber, acrylic resin, polyvinyl butyral resin and polyvinyl acetal resin. However, most of these resins are not environmentally friendly. In particular, vinyl chloride resin releases a large amount of dioxins when incinerated. Dioxins are prescribed as primary carcinogens that can be heritable by the World Health Organization and are reported to have a catastrophic effect on humans and animals.

Accordingly, the various sheet products have been required to be replaced with eco-friendly materials such as biodegradable resins.

However, biodegradable resins such as polylactic acid, polyglycolic acid, polycaprolactone, aliphatic polyester resin, polyhydroxybutyric acid and D-3-hydroxybutyric acid have poor tensile strength and elongation. When two or more biodegradable sheets are laminated in order to reinforce such physical properties, it is difficult to laminate due to insufficient adhesiveness. In addition, various patterns of patterns such as embossing are required for an interior sheet, a decoration sheet, and the like for a beautiful appearance. It is difficult to emboss the biodegradable sheet.

To this end, Korean Patent Registration No. 10-0855212 [Prior Patent Document 1] discloses a method of embossing a biodegradable resin sheet under appropriate temperature and pressure conditions, and Korean Patent Registration No. 10-0855213 [ 2], there is proposed a processing method capable of simultaneously performing embossing and embossing of a biodegradable resin sheet at an appropriate temperature and pressure, using a drum roller, an upper heater, a front heater and an emboss roller.

However, in the conventional processing method including the above-mentioned prior art documents, a printing layer and a transparent layer for protecting the printing layer are not processed. This is a method of forming a printing layer and a transparent layer through a separate process, In the case of laminating and embossing, the printed layer is peeled off, the workability is poor, and the three-dimensional structure of the embossing is not clear. In addition, the biodegradable resin sheet produced by the conventional method has a problem that the impact strength is weak, for example, embossing of the embossing occurs or tearing occurs in the sheet itself.

Korean Patent No. 10-0855212 Korean Patent No. 10-0855213

Accordingly, it is an object of the present invention to provide a printing method and a printing method capable of easily laminating a biodegradable sheet on a sheet having a print layer formed thereon, but also capable of simultaneously forming a clear emboss with no peeling of the print layer, And an object of the present invention is to provide a method of embossing a biodegradable sheet.

According to an aspect of the present invention,

Producing a biodegradable first sheet and a printed sheet on which a print layer is formed on a biodegradable second sheet;

Stacking the biodegradable first sheet on a printing layer of the printing sheet and passing the first biodegradable sheet through a pressing roller;

Passing the sheet stack passed through the squeeze rollers to a drum roller and melting the sheet stack while applying a temperature using an upper heater provided at an upper end of the drum roller; And

Applying a temperature to the melted laminated sheet by using a front heater, and then embossing the laminated sheet through the elbow roller,

The biodegradable first sheet and the biodegradable second sheet each include 40 to 100 parts by weight of an acrylo-butadiene-styrene (ABS) resin per 100 parts by weight of the biodegradable resin.

According to a preferred aspect of the present invention, in the melting and lapping step, the sheet stack passed through the pressing roller is passed through a drum roller maintained at a temperature of 50 to 150 캜 at a surface temperature, It is preferable that the sheet laminate is melt-laminated while applying a temperature of 80 ° C to 200 ° C using an upper heater. In the embossing step, a temperature of 200 ° C to 300 ° C is applied to the melted laminated sheet using a front heater, the laminated sheet is passed through an elbow roller, and a temperature of 150 ° C to 200 ° C and 60kg it is preferable to apply embossing by applying a pressure of f / cm 2 to 80 kgf / cm 2.

According to a preferred aspect of the present invention, the biodegradable first sheet and the biodegradable second sheet each preferably further comprise 40 to 100 parts by weight of polybutylene succinate (PBS) relative to 100 parts by weight of the biodegradable resin .

According to the present invention, the biodegradable second sheet can be easily laminated on the biodegradable second sheet on which the print layer is formed, and at the same time embossment of a distinct three-dimensional structure can be formed at the same time. In addition, the print layer is not peeled off, and the impact strength is excellent, so that bursting or tearing can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram for explaining a method of embossing a biodegradable sheet according to the present invention.

The present invention provides a method of embossing a biodegradable sheet capable of simultaneously embossing two sheets while laminating them together. Hereinafter, the method of embossing the biodegradable sheet according to the present invention will be abbreviated as "processing method".

According to the processing method of the present invention,

Producing a biodegradable first sheet and a printed sheet on which a print layer is formed on a biodegradable second sheet;

Stacking the biodegradable first sheet on a printing layer of the printing sheet and passing the first biodegradable sheet through a pressing roller;

Passing the sheet stack passed through the squeeze rollers to a drum roller and melting the sheet stack while applying a temperature using an upper heater provided at an upper end of the drum roller; And

Applying a temperature to the melted laminated sheet by using a front heater, and then embossing the laminated sheet through the emboss roller.

The biodegradable first sheet and the biodegradable second sheet include 40 to 100 parts by weight of an acrylonitrile-butadiene-styrene (ABS) resin based on 100 parts by weight of the biodegradable resin.

According to the present invention, the biodegradable sheet, that is, the biodegradable first sheet can be easily laminated on the printing layer, and at the same time, embosses having a distinct three-dimensional structure can be formed at the same time. At this time, the print layer is not peeled but is protected by the biodegradable first sheet. Further, according to the present invention, the impact strength is excellent, so that no bursting or tearing occurs.

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

In implementing the present invention, a processing apparatus as illustrated in Fig. 1 may be used. The processing apparatus has two pressing rollers 112 and 114 and a drum roller 120 for maintaining an appropriate surface temperature. An upper heater 130 is installed at the upper end of the drum roller 120. In addition, the processing apparatus is for embossing, and includes an emboss roller 150 having a surface irregularity structure and a rubber roller 160 disposed horizontally with the emboss roller 150. 1, a front heater 140 is installed between the drum roller 120 and the emboss roller 150

Referring to Fig. 1, the biodegradable first sheet 10 and the printing sheet 20 are first prepared. At this time, the printing sheet 20 includes a biodegradable second sheet 21 and a printing layer 22 formed on the biodegradable second sheet 21.

The biodegradable first sheet 10 and the biodegradable second sheet 21 are in the form of a sheet, and they can be produced in a sheet form, for example, by an extrusion method. The biodegradable first sheet 10 and the biodegradable second sheet 21 include 40 to 100 parts by weight of an acrylo-butadiene-styrene (ABS) resin based on 100 parts by weight of the biodegradable resin.

In the present invention, the biodegradable resin constituting the first biodegradable sheet 10 and the second biodegradable sheet 21 is not limited as long as it is biodegradable in a natural state. The biodegradable resin may be, for example, polylactic acid (PLA), polyglycolic acid (PGA), poly caprolactone (PCL), aliphatic polyester resin, polyhydroxybutyric acid polyhydroxy butyric acid (PHB), and D-3-hydroxy butyric acid.

Specifically, the biodegradable first sheet 10 and the biodegradable second sheet 21 may be sheets formed from a resin composition containing one or more biodegradable resins selected from the biodegradable resins listed above have. Preferably, at least the polylactic acid among the above-listed biodegradable resins may be contained. Polylactic acid exhibits almost the same tensile elastic modulus as polyethylene terephthalate (PET), which has excellent physical properties such as mechanical strength, and is excellent in bending rigidity and has a characteristic of being rapidly oxidized by absorbing moisture easily in the atmosphere And is useful for the present invention.

The biodegradable first sheet 10 and the biodegradable second sheet 21 further include an acrylo-butadiene-styrene (ABS) resin in addition to the biodegradable resin as described above. Specifically, the biodegradable first sheet 10 and the biodegradable second sheet 21 are each formed of a resin composition comprising 40 to 100 parts by weight of an acrylo-butadiene-styrene (ABS) resin with respect to 100 parts by weight of the biodegradable resin To prepare a sheet. According to the present invention, the biodegradable first sheet 10 and the biodegradable second sheet 21 each further comprise an acrylo-butadiene-styrene (ABS) resin, which is biodegradable and has excellent mechanical strength . More specifically, the acrylo-butadiene-styrene (ABS) resin forms a matrix with the biodegradable resin to improve the mechanical properties such as impact strength without interfering with the biodegradability of the biodegradable resin. If the content of the acrylo-butadiene-styrene (ABS) resin is less than 40 parts by weight, the mechanical properties (impact strength, etc.) of the composition may be insignificantly improved. If the amount exceeds 100 parts by weight, Sex can be somewhat mild. Considering this point, it is preferable that the acrylo-butadiene-styrene (ABS) resin is included in 60 to 80 parts by weight with respect to 100 parts by weight of the biodegradable resin.

According to a preferred embodiment of the present invention, it is preferable that the biodegradable first sheet 10 and the biodegradable second sheet 21 further comprise polybutylene succinate (PBS), respectively. Specifically, each of the biodegradable first sheet 10 and the biodegradable second sheet 21 is prepared by blending 40 to 100 parts by weight of an acrylo-butadiene-styrene (ABS) resin with 100 parts by weight of a biodegradable resin, And 40 to 100 parts by weight of succinate (PBS).

As described above, when polybutylene succinate (PBS) is further included, the compatibility of the biodegradable resin and the acrylo-butadiene-styrene (ABS) resin is improved, and mechanical properties such as impact strength and the like are more effectively improved. More specifically, the polybutylene succinate (PBS) improves the compatibility between the biodegradable resin (for example, PLA) and acrylo-butadiene-styrene (ABS) resin as described above, Structure effectively. As a result, biodegradability as well as mechanical properties such as impact strength are remarkably improved. At this time, when the content of the polybutylene succinate (PBS) is less than 40 parts by weight, the effect of improving the compatibility with the addition of the polybutylene succinate may be insignificant. If the content of the polybutylene succinate (PBS) is more than 100 parts by weight, the synergistic effect of the excess addition may not be so large. Considering this point, it is more preferable that the polybutylene succinate (PBS) is contained in 50 to 90 parts by weight, more specifically 60 to 80 parts by weight, based on 100 parts by weight of the biodegradable resin.

Among the biodegradable first sheet 10 and the biodegradable second sheet 21, at least the biodegradable first sheet 10 is transparent. That is, the biodegradable first sheet 10 positioned on the upper layer is transparent. Further, in the case of the biodegradable second sheet 21 located in the lower layer, it may be transparent or opaque. The biodegradable second sheet 21 may be opaque, for example, further comprising an inorganic material or the like. More specifically, the biodegradable second sheet 21 may further include a white inorganic material such as titanium dioxide (TiO ₂ ) to have a white hue. According to a specific embodiment of the present invention, not only the biodegradable first sheet 10 but also the biodegradable second sheet 21 are transparent.

In addition, in the present invention, the printing sheet 20 includes a printing layer 22, which includes a biodegradable second sheet 21 and a biodegradable second sheet 21, And a printed layer 22 formed on the substrate.

The printing layer 22 is formed on the biodegradable second sheet 21 through a printing method and may be formed of characters, patterns, colors, or a combination thereof. This printing layer 22 is formed by printing an ink composition. The printing layer 22 may be formed by various printing methods such as inkjet printing, gravure, laser printing, offset printing, and rotary screen, and the printing method is not particularly limited.

At this time, the ink composition may include a pigment, and more specifically, it may include a pigment and a diluent. In addition, the ink composition may include a binder resin for good adhesion with the biodegradable second sheet 21. The ink composition may specifically include a binder resin, a pigment, and a diluent, and the content thereof is not limited. The ink composition may include, for example, 1 to 30 parts by weight of a pigment and 30 to 200 parts by weight of a diluent with respect to 100 parts by weight of a binder resin.

In addition, the binder resin contained in the ink composition is not limited as long as it is an adhesive resin, and may be selected from, for example, an acrylic resin or may be selected from biodegradable resins as described above. Specifically, the binder resin may include at least one biodegradable resin selected from polylactic acid, polyglycolic acid, polycaprolactone, aliphatic polyester resin, polyhydroxybutyric acid, and D-3-hydroxybutyric acid . The pigment may be selected from organic or inorganic color pigments. Such pigments may be those conventionally used in the production of interior sheets, decorative sheets, and the like. The diluent may be any one that has printability (coating property) upon printing. The diluent may be selected from, for example, organic solvents and water selected from alcohols and ketones.

Also, according to a preferred embodiment, the print layer 22 preferably comprises aziridine. The aziridine is a colorless liquid, which is represented by the formula (CH ₂ ) ₂ NH and has a molecular weight of 43.1, a melting point of -78 ° C, and a boiling point of 55 ° to 56 ° C. . Such aziridines have an unstable trivalent ring structure and are thus easily opened and highly reactive. In particular, polyarylates such as polylactic acid, polyglycolic acid, polycaprolactone, aliphatic polyester resin, polyhydroxybutylic acid, D-3-hydroxybutyric acid, and the like, thereby improving the tensile strength and elongation of the surface of the printing sheet 20.

The aziridine is not particularly limited, but may be included in an amount of 50 to 100 parts by weight based on 100 parts by weight of the binder resin. If the content of aziridine is less than 50 parts by weight, the effect of addition thereof may be insignificant. If it exceeds 100 parts by weight, the biodegradable resin may deteriorate in terms of cost and durability of the sheet.

The ink composition may further contain other additives such as a defoaming agent, a surface modifier, an emulsifying agent, a plasticizer, a dispersing agent and the like, if necessary. As the additive, usual additives may be used.

The first biodegradable sheet 10 and the second biodegradable sheet 20 are prepared and then laminated. At this time, as shown in Fig. 1, the biodegradable first sheet 10 is placed on the printing layer 22 of the printing sheet 20. [ That is, the print layer 22 and the biodegradable first sheet 10 are positioned so as to be in contact with each other. And then passed between the two pressing rollers 112 and 114 to roll-press the biodegradable first sheet 10 and the printing sheet 20 at a predetermined pressure. At this time, the press rollers 112 and 114 may be at room temperature or may be heated to a predetermined temperature.

Thereafter, the sheet stacked body A having passed through the squeezing rollers 112 and 114 is continuously passed through the drum roller 120 to be joined together. At this time, the biodegradable second sheet 21 of the sheet stack A is brought into close contact with the surface of the drum roller 120. Also, it is preferable that the surface temperature of the drum roller 120 is maintained at 50 ° C to 150 ° C. At this time, if the surface temperature of the drum roller 120 is less than 50 캜, the heat-sealability between the print layer 22 and the first biodegradable sheet 10 is somewhat weak, and it may be difficult to have a strong bonding force. When the surface temperature of the drum roller 120 exceeds 150 캜, the biodegradable second sheet 21 adhering to the drum roller 120 is melted and attached to the drum roller 120, The melt of the biodegradable second sheet 21 may remain on the surface of the second sheet 21, and continuous lapping may be difficult. In consideration of this point, it is more preferable that the surface temperature of the drum roller 120 is kept at 80 to 120 캜 to melt-laminate.

Also, in the above-described laminating process, it is preferable to apply radiant heat at a temperature of 80 ° C to 200 ° C by using the upper heater 130 provided at the upper end of the drum roller 120. The radiant heat of the upper heater 130 is applied to the biodegradable first sheet 10 and the biodegradable first sheet 10 is softened by the radiant heat so that the heat sealability with the print layer 22 can be improved . At this time, if the radiant heat applied by the upper heater 130 is less than 80 캜, softening of the biodegradable first sheet 10 for improving the heat sealability may be somewhat difficult. If the radiant heat applied by the upper heater 130 exceeds 200 ° C, the surface of the biodegradable first sheet 10 may be melted to deteriorate the surface properties of the laminated sheet product. In consideration of this point, it is more preferable to apply radiant heat of 100 ° C to 150 ° C to the biodegradable first sheet 10 by using the upper heater 130.

The laminated sheet B thus melted and laminated is passed through the emboss roller 150 to be embossed. The front surface of the laminate sheet B is covered with a front heater 140 provided between the drum roller 120 and the emboss roller 150 before the laminate sheet B is passed through the emboss roller 150. In this case, And the like. Preferably, the front heater 140 is used to apply radiant heat at a temperature of 200 ° C to 300 ° C to the surface of the biodegradable first sheet 10 of the laminated sheet (B). When such radiant heat is applied, the embossing efficiency can be increased when the emboss roller 150 is passed by surface softening. At this time, when the radiant heat of the front heater 140 is less than 200 ° C, the degree of surface softening is weak and the increase in embossing efficiency may be insignificant. If the radiant heat of the front heater 140 exceeds 300 DEG C, the synergistic effect with the supply of excess temperature is not so large, which is also undesirable from the viewpoint of energy. That is, as described below, the emboss roller 150 does not need to apply a too high temperature to the front heater 140 because heat is applied to the emboss roller 150 at 150 ° C or more. In consideration of this point, it is more preferable to apply radiant heat at a temperature of 220 ° C to 250 ° C to the surface of the biodegradable first sheet 10 using the front heater 140.

The laminated sheet B preheated through the front heater 140 is passed between the emboss roller 150 and the rubber roller 160 to be embossed. 1, the surface of the emboss roller 150 is in close contact with the biodegradable first sheet 10 of the laminated sheet B. As shown in Fig.

In the embossing process, it is preferable that the embossing is performed by applying a pressure of 60 kgf / cm 2 to 80 kgf / cm 2 through the emboss roller 150 at a temperature of 150 ° C to 200 ° C. At this time, when the embossing temperature is lower than 150 ° C, it may be difficult to form a good embossed body. If the embossing temperature exceeds 200 캜, the surface softening of the biodegradable first sheet 10 may become too severe. If the embossing pressure is less than 60 kgf / cm 2, it is difficult for the embossing to form up to the printing layer 22, which may make it difficult to form embossing with a distinct three-dimensional structure. If the embossing pressure exceeds 80 kgf / cm 2, the workability is deteriorated and the sheet product may be ruptured after drying. In consideration of this point, it is more preferable that the embossing is carried out through the emboss roller 150 at a temperature of 155 ° C to 180 ° C and a pressure of 65 kgf / cm 2 to 75 kgf / cm 2.

The embossed laminated sheet as described above is dried, cut to a proper size as usual, and then rolled up and can be produced.

According to the processing method of the present invention described above, it is possible to simultaneously form a laminate of a biodegradable sheet and embossing, and in particular, it is possible to laminate a biodegradable first sheet 10 on a print layer 22 have. Accordingly, the embossment of the distinct three-dimensional structure can be formed on the print layer 22 at the same time without peeling off the print layer 22.

As described above, according to the present invention, the biodegradable first sheet 10 and the biodegradable second sheet 21 contain an acrylo-butadiene-styrene (ABS) resin in an appropriate amount, (PBS) is further contained in an appropriate amount to have excellent mechanical strength such as impact strength and the like. Thus, bursting or tearing due to an external impact or the like is prevented.

Hereinafter, examples and comparative examples of the present invention will be exemplified. The following embodiments are provided to help understand the present invention, and thus the technical scope of the present invention is not limited thereto. Further, the comparative example illustrated below is provided for comparison with the embodiment, which does not mean the prior art.

[Example 1]

Using the apparatus shown in Fig. 1, the biodegradable sheet was laminated and embossed as follows.

≪ Preparation of biodegradable transparent sheet &

First, 60 parts by weight (based on solid content) of an acrylo-butadiene-styrene resin (hereinafter referred to as ABS) on a particle basis was mixed with 100 parts by weight of polylactic acid (hereinafter referred to as PLA) This was kneaded and extruded in an extruder to produce a resin pellet. Thereafter, the resin pellets were put into a hopper of a biaxial extruder, and extruded at an extrusion temperature of 220 캜 and a take-off speed of 5 m / min to produce a plurality of transparent sheets having a thickness of about 500 탆.

<Embo Sheet Production>

Next, two sheets were selected from the prepared transparent sheets, and a matte print layer having a thickness of about 150 mu m was formed on one surface of the sheet. Then, another sheet was laminated on the printing layer, and then passed through the apparatus shown in Fig. 1 to perform lamination and embossing. The processing conditions are shown in Table 1 below.

[Practical example 2]

The same procedure as in Example 1 was carried out except that polybutylene succinate (hereinafter referred to as "PBS") was added to the resin pellets and the processing conditions were changed. Specifically, in contrast to Example 1, in the production of the resin pellets, the same procedure as in Example 1 was conducted except that 60 parts by weight of PBS on a particle basis was added to 100 parts by weight of PLA particles, And embossed. The processing conditions are shown in Table 1 below.

[Comparative Example 1]

The resin pellets were produced in the same manner as in Example 1, except that ABS was not used and processing conditions were different. Specifically, in contrast to Example 1, the resin pellets were prepared by laminating and embossing in the same manner as in Example 1, except that only ABS was not added and PLA was used as the resin. The processing conditions are shown in Table 1 below.

The impact strength of the embossed sheets according to each of the examples and comparative examples was evaluated. The results are shown together in Table 1 below. At this time, the impact strength was evaluated according to ASTM D-256, except that the embossed sheet was cut into 20 cm x 15 cm (width x length), both ends of the cut specimen were fixed, / cm) was measured and evaluated.

                 &Lt; Impact strength evaluation result >
Remarks Processing conditions Sheet composition
[Parts by weight]
Impact strength
[kgf · cm / cm] drum
surface Top
heater Front
heater Embossing
(Temperature, pressure) PLA ABS PBS Example 1 90 ° C 150 ℃ 210 ℃ 160 ° C,
70 kgf / cm 2 100 60 - 26.2 Practical Example 2 100 ℃ 120 DEG C 230 ℃ 160 ° C,
70 kgf / cm 2 100 60 60 30.8 COMPARATIVE EXAMPLE 1 50 ℃ 65 ℃ 180 DEG C 150 ° C,
50 kgf / cm 2 100 - - 21.5

As shown in Table 1, it can be seen that the embossed sheet according to the embodiments of the present invention has a higher impact strength than the embodiment. In addition, it can be seen that the impact strength is evaluated to be higher in the case of Example 2 in which PBS is further added than in Example 1.

10: biodegradable first sheet 20: printed sheet
21: biodegradable second sheet 22: printing layer
112, 114: Compression roller 120: Drum roller
130: upper heater 140: front heater
150: emboss roller 160: rubber roller

Claims (5)

Producing a biodegradable first sheet and a printed sheet on which a print layer is formed on a biodegradable second sheet;
Stacking the biodegradable first sheet on a printing layer of the printing sheet and passing the first biodegradable sheet through a pressing roller;
Passing the sheet stack passed through the squeeze rollers to a drum roller and melting the sheet stack while applying a temperature using an upper heater provided at an upper end of the drum roller; And
Applying a temperature to the melted laminated sheet by using a front heater, and then embossing the laminated sheet through the elbow roller,
Wherein the biodegradable first sheet and the biodegradable second sheet each comprise 40 to 100 parts by weight of an acrylo-butadiene-styrene (ABS) resin with respect to 100 parts by weight of the biodegradable resin .
The method according to claim 1,
Wherein the sheet laminate passing through the compression roller is passed through a drum roller maintained at a temperature of 50 to 150 DEG C and an upper heater provided at an upper end of the drum roller, The sheet laminate was melt-laminated while applying a temperature of 200 DEG C,
In the embossing step, a temperature of 200 ° C to 300 ° C is applied to the melted laminated sheet using a front heater, the laminated sheet is passed through an elbow roller, and a temperature of 150 ° C to 200 ° C and 60kgf / Cm &lt; 2 &gt; to 80 kgf / cm &lt; 2 &gt; is applied to the embossed sheet.
3. The method of claim 2,
Wherein the sheet laminate passing through the compression roller is passed through a drum roller maintained at a temperature of 80 to 120 DEG C, The sheet laminate was melt-laminated while applying a temperature of 150 캜,
In the embossing step, a temperature of 220 ° C to 250 ° C is applied to the melted laminated sheet using a front heater, the laminated sheet is passed through an elbow roller, and a temperature of 155 ° C to 180 ° C and 65kgf / Cm &lt; 2 &gt; to 75 kgf / cm &lt; 2 &gt; is applied to the surface of the biodegradable sheet for embossing.
4. The method according to any one of claims 1 to 3,
Wherein the biodegradable first sheet and the biodegradable second sheet further comprise 40 to 100 parts by weight of polybutylene succinate (PBS) per 100 parts by weight of the biodegradable resin.
4. The method according to any one of claims 1 to 3,
Wherein the printing layer comprises aziridine. &Lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt;

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