KR20180006208A - Sheet for piling glass and manufacture method thereof - Google Patents

Abstract

The present invention discloses a slip sheet for laminating a glass maintaining stiffness at a low weight compared to the thickness, and a manufacturing method thereof. The slip sheet for laminating a glass comprises: a substrate sheet formed as a foam shape; and two film layers individually formed on both surfaces of the substrate sheet. The thickness of the substrate sheet is formed to be 2 to 5 times of the thickness of the film layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass laminate,

The following embodiments relate to a glass laminating sheet and a method for producing the same.

Glass used as a substrate material for a display panel or a display panel is an important target in the electronics industry. The recent trend is that panels and glasses are becoming larger and larger, so it is important to prevent damage to the display.

Since a plurality of display panels or glasses are stacked and processed or transported, a film or sheet or the like is sandwiched between the stacked glasses to prevent damage.

In the conventional method, there was a problem that the dust was generated in the process of lamination or the cushioning force was not sufficient enough to mitigate the impact of the glass.

Accordingly, there is a demand for a laminate for lamination having a sufficient cushioning force while minimizing generation of dust.

Specifically, the separator used in the lamination of the glass or the display panel requires a cushioning force enough to relieve the impact of the glass. In this case, when the thickness is too thin, it is not sufficient to prevent the damage by the glass cullet, and when the thickness is increased, the load of the panel is limited, so an appropriate balance is required.

In addition, if a phenomenon occurs in which a protruded portion of the sheet is folded in the process of stacking a plurality of panels or glasses, it is difficult to remove the sheet in the process, so that the production efficiency is sharply lowered.

In this connection, JP-A-10-0942433 discloses a method for producing an antistatic laminated support for a display glass.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a glass laminator for holding a stiffness while having a weight lower than a thickness, and a method of manufacturing the same.

An object of an embodiment is to provide a glass laminator for preventing glass damage by foaming a substrate sheet and a method for manufacturing the same.

An object according to an embodiment is to provide a glass laminator for preventing glass damage caused by cullet by having film layers formed on both sides of a base sheet have different roughness and a method for manufacturing the same.

An object of an embodiment is to provide a glass laminating sheet for preventing foaming cells formed on a substrate sheet from being blown by controlling the thickness ratio of the substrate sheet and the surface layer, and a method of manufacturing the same.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

The glass laminate according to one embodiment includes a foamed substrate sheet and two film layers formed on both sides of the substrate sheet, wherein the thickness of the substrate sheet is 2 to 5 times the thickness of each of the film layers .

On one side, the base sheet includes a resin-based material and a foaming agent composition,

The resin material may include a polyolefin compound, and the expansion ratio of the base material sheet may be 1.2 to 5.0.

On one side, the resin material may include one or more of polyethylene, polypropylene, polystyrene, polyamide, PET and EVA.

On one side, the foaming agent composition may include at least one of a hydrazide- or nonhydrazide-based foaming agent, an inorganic foaming agent, and a thermally expandable microcapsule foaming agent.

In one aspect, the hydrazide type blowing agent includes at least one of OBSH, PTSH and BSH, and the non-hydrazide type blowing agent includes at least one of ADCA, DPT, PTSS and 5Pt, May comprise at least one of sodium bicarbonate, ammonium bicarbonate, ammonium carbonate, ammonium nitrite, sodium borohydride, an azide compound and sodium bicarbonate.

Wherein the film layer comprises a polyolefin-based compound and an additive,

The additive may be selected from the group consisting of PDMS, dimethylsiloxane derivatives of dimethylsiloxane derivatives of which the methyl group or a part thereof is substituted with at least one aliphatic or aromatic group selected from hydrogen, phenyl group, halogenated phenyl group, halogenated alkyl group, Lucamide, oleyl palmitamide, stearylcarbamide, ethylenebisoleamide, and the like.

Wherein the film layer comprises an anti-blocking agent, wherein the anti-blocking agent is selected from the group consisting of a polyether siloxane copolymer, an organic modified polysiloxane, a polyether-modified polydimethylsiloxane, a methacryloxy functional silicone, Functionalized silicone glycols, alkylmethylsiloxanes, silicone glycols, and water- and oil-based silicone additives in the form of derivatives or copolymers thereof.

Wherein the film layer comprises an antistatic agent and the antistatic agent is a photocurable hard coat composition comprising an acrylic monomer, a colloidal inorganic oxide, a silane compound, an alkyl-alkoxyacrylate monomer or oligomer and a colloidal stabilizer, A carbon nanotube, a photoinitiator, and an organic solvent.

On one side, the two film layers may have different roughnesses.

On one side, the film layers may each have a thickness of 10 [mu] m to 50 [mu] m.

In one side, the glass laminating sheet has a stiffness of 0.6 g · cm to 5.0 g · cm in the MD direction (Machine Direction) measured by a TAPPI Stiffness method and a stiffness of 0.6 in the CD direction (Cross Machine Direction) g 占 퐉 to 4.0 g 占 cm m.

A method for producing a glass laminating sheet according to an embodiment includes a foaming step of adding a foaming agent composition to a polyolefin compound to foam it, a base sheet forming step of extruding the foamed compound to form a base sheet, a polyolefin- A second mixture comprising a polyolefinic system and a slip agent; and a second mixture comprising a polyolefinic system and a slip agent, wherein the first mixture is coated on one side of the substrate sheet And a film layer forming step of coating the second mixture on the opposite side to form two film layers.

On one side, the base sheet may be manufactured to have a thickness of 2 to 5 times the film layer thickness.

On one side, the expansion ratio of the base sheet may be 1.2 to 5.0 based on the density.

The composition and the composition ratio of the first mixture and the second mixture may be different on the one side.

The glass laminate according to one embodiment maintains high rigidity while maintaining a basis weight (weight per unit area), and can be easily removed after the process is finished.

The glass laminate according to one embodiment can prevent the damage caused when the glass is laminated by forming the foam cell inside the substrate sheet.

The glass laminate according to one embodiment can prevent damage due to cullet in the glass laminating process by changing the illuminance of the film layer formed on both sides of the substrate sheet.

The method for manufacturing a glass laminate for laminating according to one embodiment can provide a laminate for glass lamination having the effects as described above.

The effects of the glass laminate and the method of manufacturing the glass laminate according to one embodiment are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view showing a cross section of a glass laminate according to an embodiment; FIG.
2 is a perspective view of a glass laminator according to one embodiment.
FIG. 3 is a view showing the lamination of glass using the glass laminate according to one embodiment. FIG.
Fig. 4 shows holes formed in the film layer when the film layer is thinner than the thickness of the base sheet.
Figure 5 shows the surface of a film layer in a glass laminate according to one embodiment.

In the following, embodiments will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Various modifications may be made to the embodiments described below. It is to be understood that the embodiments described below are not intended to limit the embodiments, but include all modifications, equivalents, and alternatives to them.

The terms used in the examples are used only to illustrate specific embodiments and are not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this embodiment belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. In the following description of the embodiments, a detailed description of related arts will be omitted if it is determined that the gist of the embodiments may be unnecessarily blurred.

Hereinafter, with reference to Figs. 1 to 5, a glass laminating insert 1 according to an embodiment will be described in detail. 1 is a cross-sectional view showing a schematic cross section of a glass laminate sheet 1, FIG. 2 is a perspective view of the glass laminate sheet 1, and FIG. 3 is a cross- FIG. 4 illustrates the formation of holes in the film layer 120, and FIG. 5 illustrates the surface of the normal film layer 120. FIG.

However, the thickness and the shape of each component are not shown in an accurate shape or ratio in the glass laminating sheet 1 according to the embodiment, and the glass laminating sheet 1 shown in the drawing is not described It should be noted that the drawings are schematically shown to aid understanding of the present invention.

The glass laminate separator 1 may basically include a foamed base material sheet 110 and two film layers 120 formed on both sides of the base material sheet 110 respectively. In this case, the thickness of the base sheet 110 in the glass laminate paper 1 may be 2 to 5 times the thickness of one film layer 120. [

 The film layer 120 formed on one surface of the substrate sheet 110 is referred to as a first film layer 120 and the film layer 120 formed on the opposite surface is referred to as a second film layer 120. [ . It should be noted that the characteristics of the first film layer 120 and the second film layer 120 are not distinguished from each other and the two film layers 120 may be referred to as a film layer 120 .

The base sheet 110 may include a resin-based material and a foaming agent composition and foamed to have an expansion ratio of 1.2 to 5.0 based on the density.

The resin material basically includes a polyolefinic compound, and may be selected from the group consisting of polyethylenic, polypropyleneic, polystyrenic, polyamide, PET (polyethylene phthalate) and EVA (Ethylene-Vinyl Acetate Copolymer).

The base sheet 110 may include a foaming agent composition, and the foaming agent composition may serve to induce the base sheet 110 to increase in volume by permeating air therein. In this case, the foaming agent composition may include at least one of a hydrazide-based (hydrazide-based) foaming agent or a non-hydrazide-based organic foaming agent, an inorganic foaming agent and a microcapsule foaming agent.

In this case, when a hydrazide type foaming agent is used, the expansion ratio of the base sheet can be increased, and when an inorganic foaming agent is used, heat generated during the foaming process can be reduced.

The hydrazide type blowing agent contains at least one of OBSH (P, P'-Oxybisbenzenesulfonyl Hydrazide), TSH (P-Toluenesulfonyl Hydrazide) and BSH (Benzenesulfonyl Hydrazide) as a blowing agent having -CONHNH ₂ or -SO ₂ NHNH ₂ functional group, But are not limited to, mixtures thereof.

 For example, the non-hydrazide-based organic foaming agent may be azodicarbonamide (ADCA), dinitroso pentamethylenetetramine (DPT), p-toluenesulfonyl semicarbazide (PTSS), or the like. , 5-PT (5-Phenyltetrazole), or a mixture thereof.

And, the foaming agent composition may contain an inorganic foaming agent. For example, an inorganic blowing agent is bicarbonate, sodium room (NaHCO _3), ammonium bicarbonate (NH ₄ HCO _3), ammonium carbonate _{((NH 4) 2 CO 3} ), ammonium nitrite (NH4NO2), boron-hydrogen sodium (NaBH4), O But not limited to, one or more of the following compounds:

In addition, the blowing agent composition may comprise Microcapsule or Microsphere. Thermo-expansive Microcapsule is a form of thermoplastic polymer film formed with spherical bodies at low temperature volatile solvent, and it can be foamed several times more than circular when heated.

The foaming agent composition may further comprise conventional additives used in the foaming process. Examples of the additive include calcium stearate, calcium compounds such as calcium carbonate (CAS No. 471-34-1), zinc oxide, zinc stearate, zinc or zinc compounds such as zinc stearate; titanium or tin compounds such as titanium dioxide and tin methoxy maleate; barium stearate; Barium compounds such as barium ricinoleate, magnesium compounds such as magnesium oxide, talc, monosodium citrate, urea, and the like. ), Silica, dicyclohexyl phthalate, stearic acid, mixtures thereof, and the like.

The foaming agent composition may be mixed with the target resin material to form the base material sheet 110 and allow the base material sheet 110 to be foamed. In this case, the base sheet 110 can be foamed by various methods such as non-crosslinking, chemical crosslinking, electron beam crosslinking and the like.

Through the foaming, a cell due to the foaming gas is formed in the base sheet 110, which causes the volume of the base sheet 110 to expand. Accordingly, the mass of the substrate sheet 110 is reduced according to the unit volume, and the cushioning effect that absorbs the impact can be obtained due to the cells formed inside.

At this time, the foaming magnification of the base sheet 110 in the glass lamination paper 1 can be 1.2 to 5.0, preferably 1.2 to 3.0 based on the density. As the expansion ratio of the base sheet 110 increases, the shock absorbing effect due to the cushioning effect of the base sheet 110 becomes stronger, but the stiffness decreases.

For example, when the expansion ratio of the base material sheet 110 is less than 1.2 on the basis of the density, in the process of laminating the glass through the glass laminating sheet 1, the impact due to friction between the glass can not be sufficiently absorbed, Or the quality of the product may be deteriorated.

On the other hand, if the expansion ratio of the substrate sheet 110 is increased, the stiffness of the glass laminate paper 1 is reduced. In this case, when the expansion ratio of the base sheet 110 is 5.0 or more as density, the stiffness is not enough to hold the shape in the process of laminating the glass, and the projecting portion of the sheet is folded, There is a problem that it is difficult to remove during the process.

That is, when the expansion ratio of the base material sheet 110 is 1.2 to 5.0 based on the density, the glass laminate paper 1 has a sufficient impact reducing effect to prevent glass damage, It is possible to have a stiffness so as to be easy to remove even after.

On both sides of the base sheet 110, two film layers 120 are formed. The film layer 120 may be formed including a polyolefin-based compound and an additive.

In this case, the polyolefinic compound may be selected from the group consisting of polyethylene, polypropylene, polystyrene, PET (polyethylene phthalate), and EVA (ethylene-vinyl acetate copolymer) And at least one selected from the group consisting of

Further, the base sheet 110 may further include a polyamide-based material.

In addition, the film layer 120 may include a slip agent as an additive. In this case, the slip agent may include various materials. For example, polydimethyl siloxane (PDMS), a dimethylsiloxane in which the methyl group or a part of dimethylsiloxane is substituted with at least one aliphatic or aromatic group selected from hydrogen, a phenyl group, a halogenated phenyl group, a halogenated alkyl group, Derivatives and the like may be used.

In addition, short-acting slip agents such as oleamide, erucamide, oleyl palmitamide, stearly erucamide, and ethylene bis oleamide may be used . However, the kind of the slip agent is not limited thereto.

By including the slip agent, the film layer 120 can have the effect of preventing glass damage. That is, in the glass lamination paper sheet 1, the film layer 120 comes into contact with the glass, and the coefficient of friction of the film layer 120 can be adjusted due to inclusion of the slipping agent and the addition ratio.

Further, the two film layers 120, which are centered on the base sheet 110, can be formed to have different roughnesses, if necessary. That is, the roughness of the two film layers 120 may be different depending on whether or not the slip agent is added, the addition rate, and the presence or absence of other additives.

For example, when the glass laminating sheet 1 is used for loading LCD Glass, the first film layer 120 is in contact with the circuit surface of the LCD glass, and the second film layer 120 is in contact with the glass surface . In this case, the first film layer 120 may be formed to have a high coefficient of friction to prevent movement of the glass cullet between the first film layer 120 and the circuit surface.

On the other hand, the second film layer 120 is formed to have a low coefficient of friction, and it is possible to prevent the surface damage from being caused by the glass cullet when the glass surface moves. As a result, it is possible to prevent the glass from being damaged due to the cullet during the process of carrying out the lamination of the glass and the transportation process.

And, the film layer 120 may include various materials as an additive.

For example, the additive may include an anti-blocking agent, and examples of the anti-blocking agent include a polyether siloxane copolymer, an organo-modified polysiloxane, a polyether-modified polydimethylsiloxane, -modified polydimethylsiloxane, methacryloxy functional silicone, silicone glycol with carbinol functionality, alkylmethylsiloxane, silicone glycol, and derivatives thereof. Based or silicone-based, silicone-based, silicone-based, silicone-based, silicone additive.

Further, the film layer 120 may contain an antistatic agent in the additive. For example, the antistatic agent includes a photocurable hard coating composition comprising an acrylic monomer, a colloidal inorganic oxide, a silane compound, an alkylalkoxy acrylate monomer or oligomer and a colloidal stabilizer, a carbon nanotube, a photoinitiator, an organic solvent, and the like can do.

Further, the film layer 120 may further include a coating layer containing an antistatic agent.

The film layer 120 may have a thickness of 10 [mu] m to 100 [mu] m, and preferably a thickness of 10 [mu] m to 50 [mu] m.

When the film layer 120 has a thickness of 10um or more, gas generated while the substrate sheet 110 is foamed can be prevented from being released to the outside of the film layer 120. [ That is, it is possible to prevent the foaming cell (Cell) formed in the substrate sheet 110 from popping and to prevent the formation of holes in the film layer 120.

When the film layer 120 is 100um or less, it is possible to prevent the glass laminating sheet 1 from becoming excessively heavy. Therefore, it is possible to prevent the mass of the base sheet 110 from increasing excessively.

Accordingly, the thickness of each film layer 120 and the substrate sheet 110 in the glass laminate sheet 1 having a constant thickness may be a ratio of 1: 2 to 1: 5. As the thickness of the base sheet 110 increases compared to the thickness of the film layer 120, the glass laminate 1 can absorb a higher impact force. On the other hand, as the thickness of the film layer 120 is increased compared to the thickness of the base sheet 110, the foaming cells inside the base sheet 110 can be prevented from popping.

For example, when the thickness of the base sheet 110 is not more than twice the thickness of the film layer 120, sufficient foam cells are not formed in the base sheet 110 and the impact force It is not possible to provide a sufficient cushioning force to absorb the glass, so that the glass may be damaged.

On the other hand, when the thickness of the base sheet 110 is five times or more the thickness of the film layer 120, a problem may occur that the foam cells formed inside the base sheet 110 are blown. That is, since the thickness of the film layer 120 is too thin compared to the thickness of the base sheet 110, bubbles can not be held in the base sheet 110, and holes may be formed in the film layer 120 .

For example, when the thickness of the base sheet 110 is 5 times or more the thickness of the film layer 120 and the thickness of the film layer 120 is relatively thin, A hole may be formed on the surface. On the other hand, when the thickness of the base sheet 110 is within 5 times the thickness of the film layer 120, holes can be prevented from being formed on the surface of the film layer as shown in FIG.

Thus, the glass laminate paper 1 having the range of the base sheet 110 and the film layer 120 has a certain range of rigidity. For example, the glass laminating sheet 1 has a stiffness in the machine direction (MD direction) measured by a TAPPI (Stiffness method) from 0.6 g · cm to 5.0 g · cm , And the stiffness of the CD direction (Cross Machine Direction) may be set to be 0.6 g · cm to 4.0 g · cm.

The stiffness in this range is sufficient to remove the glass laminate 1 after the manufacturing process or the transportation process. 3, the glass laminating sheet 1 is interposed halfway when the glass 500 or the LCD Glass is loaded, has an area larger than that of the glass 500, Partially protruding.

In this case, if the stiffness is not sufficient, there is no shape retaining force, and the protruding portion of the sheet is bent, which may make it difficult to release the stack. On the other hand, the glass laminating sheet 1 according to the embodiment has a sufficient rigidity, so that the shape of the projecting portion is maintained when releasing the lamination, which is advantageous in favor of the removing process of the glass laminating sheet 1 .

Next, a method of manufacturing the glass laminate paper 1 will be described.

The method for manufacturing the glass laminate paper 1 according to one embodiment includes a foaming step of adding a foaming agent composition to a polyolefin compound and foaming the foaming agent, a step of extruding the foaming compound to form a base sheet 110 ), A first mixture preparation step of producing a first mixture comprising a polyolefin series and a slipping agent, a second mixture preparation step of producing a second mixture comprising a polyolefin series and a slipping agent, And forming the film layer 120 to form the two film layers 120 by coating the first mixture on one side of the first mixture and coating the second mixture on the opposite side.

In the compound foaming step, the foaming agent composition may be added to the polyolefin compound, and the compound may be foamed through various methods such as non-crosslinking, chemical crosslinking, electron beam crosslinking and the like. However, in the compound foaming step, compounds other than polyolefin-based compounds and a foaming agent composition may be added, which is the same as described above.

Further, in the compound foaming step, the compound can be formed to have an expansion ratio of 1.2 to 5.0. For example, when the expansion ratio of the compound is made to have a density of 1.2 or more, the glass laminate 1 can have a cushion and a thickness enough to prevent scratches due to friction between glass.

On the other hand, the glass laminate paper 1 produced so as to have a high expansion ratio of the compound has a low rigidity. Therefore, the glass laminating sheet 1 produced so that the foaming magnification of the compound is within 5.0 can provide sufficient shape retention so that the folding of the protruding portion does not occur while the glass is laminated.

For example, if the glass laminate is larger than the glass, if the protruding portion of the glass laminate is bent during the lamination process, it is difficult to easily remove the glass laminate in the manufacturing process, And the efficiency of the process deteriorates.

That is, the glass laminating sheet (1) produced so that the foaming magnification of the compound is in the range of 1.2 to 5.0 has a sufficient impact reducing effect to prevent damage to the glass, and is easy to remove even after the manufacturing process or the transportation process is finished So that it can have a stiffness.

In the step of forming the base sheet 110, the foamed compound is extrusion-molded to form the base sheet 110.

In the first mixture preparation step, the first mixture may be formed comprising the polyolefin-based material and the slip agent. Further, the first mixture may further contain other additives exhibiting such effects as an anti-blocking agent, an ultraviolet blocking agent, and an antistatic agent. The components of the additive are as described above.

In the second mixture preparation step, a second mixture may be formed similarly to the first mixture preparation step. However, the composition ratios of the second mixture and the first mixture or added materials may be different from each other.

For example, the first mixture and the second mixture may be prepared to have different slip composition ratios, and each film layer 120 formed therethrough may have a different coefficient of friction. Likewise, each of the mixtures may have different composition ratios or different antistatic effects or properties, including other additives.

In the film layer formation step 120, the first mixture layer 120 and the second mixture layer are coated on both sides of the base sheet 110 to form the first and second film layers 120 and 120.

At this time, the base sheet 110 may be manufactured so as to have a thickness of 2 to 5 times the thickness of the film layer 120. In this case, as the thickness of the base sheet 110 is increased compared to the thickness of the film layer 120, the glass laminate sheet 1 can absorb a higher impact force.

On the other hand, as the thickness of the film layer 120 is increased compared to the thickness of the base sheet 110, the foaming cells inside the base sheet 110 can be prevented from popping. For example, when the thickness of the film layer 120 is thinner than that of the base sheet 110, holes may be formed on the surface of the film layer 120 as shown in FIG.

Therefore, the glass laminate paper 1 produced so that the thickness of the base material sheet 110 is twice or more the thickness of the film layer 120 has a cushion for preventing glass damage during the process and transportation Can be formed.

On the other hand, in the glass laminate sheet 1 produced so that the thickness of the base sheet 110 is 5 times or less the thickness of the film layer 120, the bubbles formed in the base sheet 110 burst, It is possible to prevent formation of holes. For example, holes may be prevented from being formed in the film layer 120 as shown in FIG.

 The film layer 120 may be coated on the substrate sheet 110 through various methods such as an extrusion method, a coating method, a spraying method, and a deposition method. For example, a method such as thermocompression, gravure, offset, kiss bar, Meyer bar, nose magic, roll, casting or spraying may be used, but the method of forming the coating layer is not limited thereto.

For example, the first film layer 120 and the second film layer 120 may be coated on both sides of the substrate sheet 110 by an extrusion method. Specifically, a first film layer 120 and a second film layer (not shown) are formed on both sides of the base sheet 110 through a method in which the base sheet 110 and the first mixture and the second mixture are thermocompression- 120 may be formed at one time.

The method of forming the coating layer is not particularly limited in the present invention but may be carried out by using a method such as gravure, offset, kiss bar, knife, Meyer bar, A coating layer can be formed on one side

Hereinafter, the glass laminating sheet 1 according to the embodiment will be described in detail with reference to examples and comparative examples. This is for illustrative purposes only, and thus the scope of the embodiment is not limited.

< Example  1>

Thereby forming a base sheet 110 made by crosslinking polypropylene (PP, Polyprolylene). Then, a film layer 120 including polypropylene and a slipping agent was adhered to both surfaces of the base sheet 110 by thermocompression. The foaming magnification of the base sheet 110 was 1.5 times, and the film layers 120 were each formed to have a thickness of 25 mu m. The base sheet 110 has a thickness of 150 μm and the thickness ratio of the film layer 120 and the base sheet 110 is 1: 3.

&Lt; Example 2 >

According to the above-described manufacturing method, a base material sheet 110 produced by non-crosslinking polypropylene (PP, Polyprolylene) was formed. Thereafter, a film layer 120 comprising polypropylene and a slip agent was coated on both sides of the base sheet 110 in the form of a film. The foaming magnification of the base sheet 110 was doubled, and the film layers 120 were each formed to have a thickness of 20 um. The base sheet 110 has a thickness of 160 um and the thickness ratio of the film layer 120 and the base sheet 110 corresponds to 1: 4.

<Comparative Example>

Comparative Examples for Examples 1 and 2 were prepared. In order to compare with kanji for use in the glass lamination, sheets made of kraft paper, papermaking paper, A4 paper, LDPE foam, and gas foam were prepared.

< Experimental Example 1 > Basis weight  Comparative experiment

The basis weight (g / m &lt; ² &gt;) of the glass laminate 1 of Example 1 and Example 2 was measured through an electronic balance. In addition, the basis weights of the objects prepared as comparative examples were measured through the same electronic balance.

Kinds Basis weight (unit g / m ² ) General banner 60 Kraft paper 80 Gravel 65 A4 84 Example 1 72 Example 2 75 LDPE Foam Sheet 67 Gas Foam Sheet 20

< Rating 1 >

Compared with the comparative objects, the basis weights of Examples 1 and 2 were lower than those of the A4 paper, and it was confirmed that the basis weights were similar to those of the other comparative examples.

Experimental Example 2 (TAPPIT489)

In order to measure the stiffness of the paper, the stiffness test based on the TAPPI Stiffness method was performed. The measurement method was TAPPI T489 and Taber 150-B stiffness tester was used as the measuring instrument.

The MD (Machine Direction) and CD (Cross Machine Direction) stiffnesses of the glass laminates (1) and Comparative Examples prepared in Examples 1 and 2 were measured and compared, respectively.

Kinds MD (unit: g · cm) CD (unit: g · cm) General banner 0.6 0.6 Kraft paper 4.5 3 Gravel 2 One A4 3.75 2 Example 1 1.72 One Example 2 1-1.75 One LDPE Foam Sheet 0.5 0.5 Gas Foam Sheet 0.5 0-0.5

<Evaluation 2>

Comparing the stiffnesses of Examples 1 and 2 with those of Comparative Examples, it was confirmed that the stiffnesses of MD and CD are higher than those of Comparative Examples except A4 paper. In particular, it has a higher level of stiffness than that of the currently used plain paper, so that the shape retention is relatively high.

Experimental Example 3 (TAPPIT566)

In order to measure the stiffness of the paper, the stiffness test based on the TAPPI Stiffness method was performed. The measurement method was TAPPI T566 and the Taber 150-B stiffness tester was used as the measuring instrument.

The MD (Machine Direction) and CD (Cross Machine Direction) stiffnesses of the glass laminates (1) and Comparative Examples prepared in Examples 1 and 2 were measured and compared, respectively.

Kinds MD (unit: g · cm) CD (unit: g · cm) Kraft paper 17 8 Gravel 4.75 2 A4 13 8 Example 1 3.5 3 Example 2 3.75 3.5 LDPE Foam Sheet One 0.75 Gas Foam Sheet 0.5 0.25

< Rating 3 >

Comparing the stiffnesses of Examples 1 and 2 with those of Comparative Examples, it was confirmed that the stiffnesses of MD and CD are higher than those of Comparative Examples except A4 paper. In particular, it was confirmed that the sheet has a higher level of shape retention than the currently used general sheet.

Examination of Experimental Examples 1 to 3 confirmed that the glass laminate paper 1 of Examples 1 and 2 had a significantly improved rigidity while maintaining a basis weight similar to that of the currently used paperboard. This is because the glass laminating sheet 1 according to the embodiment has a very high shape retention force, so that it is possible to prevent the folding phenomenon of the projecting portion from occurring when the separator is removed after the process or transportation, As shown in Fig.

In view of the fact that the A4 does not have a sufficient cushion and can not prevent the glass from being damaged by the cullet when the glass is stacked in the case of A4 having a similar shape retention force, 1) is sufficient to prevent damage to the glass, while securing a stiffness similar to A4.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, if the techniques described are performed in a different order than the described methods, and / or if the described components are combined or combined in other ways than the described methods, or are replaced or substituted by other components or equivalents Appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (15)

A foamed formed substrate sheet; And
And two film layers respectively formed on both sides of the substrate sheet,
Wherein the thickness of the base sheet is 2 to 5 times the thickness of each of the film layers.
The method according to claim 1,
The base sheet includes a resin-based material and a foaming agent composition,
Wherein the resin-based material comprises a polyolefin-based compound,
The expansion ratio of the base sheet is 1.2 to 5.0 based on the density.
3. The method of claim 2,
Wherein the resin-based material comprises at least one of a polyethylene-based, polypropylene-based, polystyrene-based, polyamide-based, PET and EVA-based glass laminate.
3. The method of claim 2,
Wherein the foaming agent composition comprises at least one of a hydrazide-based or nonhydrazide-based foaming agent, an inorganic foaming agent and a thermally expandable microcapsule foaming agent.
5. The method of claim 4,
The hydrazide blowing agent includes at least one of OBSH, PTSH and BSH,
The non-hydrazide type foaming agent includes at least one of ADCA, DPT, PTSS, and 5-PT,
Wherein the inorganic foaming agent comprises at least one of sodium bicarbonate, ammonium bicarbonate, ammonium carbonate, ammonium nitrite, sodium borohydride, azide compounds and sodium bicarbonate.
The method according to claim 1,
Wherein the film layer comprises a polyolefinic compound and an additive,
The additives include PDMS, dimethylsiloxane derivatives in which the methyl group or a part thereof of the dimethylsiloxane is substituted with one or more aliphatic or aromatic groups selected from hydrogen, a phenyl group, a halogenated phenyl group, a halogenated alkyl group, a fluoroester group and the like, oleamide, erucamide, Oleyl palmitamide, stearylcarbamide, and ethylenebisoleamide. &Lt; Desc / Clms Page number 19 &gt;
The method according to claim 1,
Wherein the film layer comprises an anti-blocking agent, wherein the anti-blocking agent is selected from the group consisting of a polyether siloxane copolymer, an organic modified polysiloxane, a polyether modified polydimethylsiloxane, a methacryloxy functional silicone, a silicone glycol having a carbinol functional group , Alkyl methyl siloxanes, silicone glycols, and their aqueous or oily silicone additives in the form of derivatives or copolymers thereof.
The method according to claim 1,
Wherein the film layer comprises an antistatic agent and the antistatic agent is a photocurable hard coating composition comprising an acrylic monomer, a colloidal inorganic oxide, a silane compound, an alkyl-alkoxy acrylate monomer or oligomer and a colloidal stabilizer, a carbon nanotube, , And an organic solvent.
The method according to claim 1,
Wherein the two film layers have different roughnesses.
The method according to claim 1,
Wherein the film layer has a thickness of 10 [mu] m to 50 [mu] m each.
The method according to claim 1,
In the glass lamination paper sheet,
As measured by the TAPPI Stiffness method,
The machine direction rigidity is 0.6 g · cm to 5.0 g · cm,
And the stiffness of the Cross Machine Direction is from 0.6 g · cm to 4.0 g · cm.
A foaming step of foaming the polyolefin compound by adding the foaming agent composition;
A base sheet forming step of extruding the foamed compound to form a base sheet;
A first mixture producing step of producing a first mixture comprising a polyolefin system and a slipping agent;
Producing a second mixture comprising a polyolefin system and a slip agent; And
And a film layer forming step of coating the first mixture on one side of the base sheet and coating the second mixture on the opposite side to form two film layers.
13. The method of claim 12,
Wherein the base sheet has a thickness of 2 to 5 times the thickness of the film layer.
13. The method of claim 12,
Wherein the foaming magnification of the base sheet is 1.2 to 5.0 based on the density.
13. The method of claim 12,
Wherein the composition and the composition ratio of the first mixture and the second mixture are different.

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