WO2002087875A1

WO2002087875A1 - Transparent sheet and transparent case using the sheet

Info

Publication number: WO2002087875A1
Application number: PCT/JP2002/003831
Authority: WO
Inventors: Mieko Nasu; Tatsuo Sato
Original assignee: Shiseido Company, Ltd.
Priority date: 2001-04-23
Filing date: 2002-04-17
Publication date: 2002-11-07

Abstract

A transparent sheet with an environmental friendliness, a sufficient strength, and an excellent moisture resistance, and a method of manufacturing a transparent case, the transparent sheet comprising a cellophane layer formed of cellophane with biodegradation and a synthetic resin layer stuck on one or both faces of the cellophane layer, the method of manufacturing the transparent case using the transparent sheet comprising the steps of punching out the transparent sheet in a specified flat surface shape, forming a ruled line for bending on the transparent sheet, and bending the transparent sheet along the ruled line for bending.

Description

Description Transparent sheet and transparent case using the same

The present invention relates to a transparent sheet and a transparent case using the same, and more particularly, to a transparent sheet suitable for storing appropriate articles such as cosmetic tools and cosmetic containers, and a transparent case using the sheet. Background art

In recent years, product display containers that store cosmetics, daily necessities, and other commodities and store these products in stores have been using paper to make the stored commodities easily visible from the outside. Transparent cases made of synthetic resin have been frequently used in place of containers. As the transparent case made of synthetic resin, polyethylene terephthalate, polypropylene and the like are widely used.

However, the transparent case made of polyethylene terephthalate, polypropylene, etc. becomes unnecessary immediately after purchasing the product. Although the treatment method for unnecessary transparent cases differs depending on the local government, there is a problem that the transparent case becomes incombustible waste in any treatment method.

For this reason, environmentally friendly and biodegradable materials are attracting attention as transparent case materials. Here, cellophane and polylactic acid are mentioned as biodegradable materials.

However, if a transparent sheet is formed using only cellophane or polylactic acid and used in a transparent case, it is generally difficult to make cellophane-polylactic acid thick, so a transparent case with sufficient strength There was a problem that can not be made. By the way, the transparent case is manufactured by using a sheet on which a firewood wire for folding is formed (hereinafter, this may be referred to as a sheet containing a wire) and bending the sheet along the wire for folding. Have been.

Fig. 1 is a diagram showing an example of a conventional sheet with a bright line. Sheet 1 is installed on both outer sides. Intermediate layers 4, 5, and 6 are laminated between the outermost layers 2 and 3 that are provided. In addition, the bending & wire is generally composed of a wire processing portion 7 formed on the sheet 1 as shown in FIG. 1, and is formed over the entire width of the portion to be bent. Such a go-line processing section 7 is formed by using a purl line blade described later, pressing the sheet 1 between the 藓 -line blade and a flat pedestal, and denting the sheet 1 in its thickness direction. However, in the above sheet 1, if the material used for the middle layers 4, 5, and 6 is weak to humidity, the middle layers 4, 5, and 6 of the sheet 1 come into direct contact with external air after bending, and There was a problem that appearance was not good. Further, in order to increase the strength of the entire sheet 1, a sheet is manufactured by laminating a plurality of layers, but in the conventional sheet 1, since the assault line processing portion 7 is exposed to the outside, There is a problem that the laminated sheets are peeled off (delamination). Further, a sheet 1a as shown in FIG. 2 is used in the conventional transparent case. The sheet la is made of, for example, a polyolefin having transparency on the surface of a resin film 4a made of cellophane or polylactic acid. The weakness of highly transparent resin films, such as cellophane without moisture resistance and polylactic acid without impact resistance, is compensated for by laminating resin film 2a.

However, the polyolefin-based resin film 2a has a problem that the adhesion to different materials, for example, the adhesion of a printing ink or the adhesion to a resin film during printing is poor. In order to solve this problem, corona discharge treatment is performed on both surfaces of the olefin resin film 2a. As shown in FIG. 3, the polyolefin resin film 2a is usually stored in a state where the polyolefin resin film 2a is wound in a roll shape.

However, since the polyolefin-based resin film 2a has been subjected to corona discharge treatment on both sides as described above, if the film is wound in a roll like this, the films adhere to each other. Forcibly rewinding the film causes a problem that the film is stretched.

The present invention has been made in view of the above problems, and has as its object to provide a transparent sheet that is environmentally friendly, has sufficient strength, has good moisture resistance, and a transparent case using the same. Further, another object of the present invention is to provide a transparent sheet containing a line, which has good appearance and does not cause delamination, and a transparent case using the same.

Further, the present invention provides a transparent sheet which prevents adhesion between polyolefin-based resin films, and which does not impair the transparency when the polyolefin-based resin film is bonded to a resin film made of, for example, polylactic acid. The purpose is to provide a transparent case that uses.

In order to achieve the object of the present invention, the transparent sheet according to the present invention comprises a cellophane layer or a polylactic acid layer, and a synthetic resin layer bonded to one or both surfaces of the cellophane layer or the polylactic acid layer.

According to the above invention, since the transparent sheet uses biodegradable cellophane or polylactic acid, it can be made an environmentally friendly transparent sheet, and the synthetic resin layer is a cellophane layer or a polylactic acid layer. Since it is bonded to a transparent sheet, a transparent sheet having sufficient strength and good moisture resistance can be obtained.

Further, the transparent sheet according to the present invention is characterized in that, in the transparent sheet described above, the cellophane layer or the polylactic acid layer is laminated in multiple layers.

According to the above invention, since the cellophane layer or the polylactic acid layer is laminated in multiple layers, a transparent sheet having more sufficient strength can be obtained.

Further, in the transparent sheet according to the present invention, in the above transparent sheet, the synthetic resin as a material of the synthetic resin layer is a tensile elongation at break of cellophane or polylactic acid as a material of the cellophane layer or the polylactic acid layer. Having a higher tensile elongation at break, with the cellophane layer or the polylactic acid layer as the middle layer, and providing the synthetic resin layers as outermost layers on both outer sides of the middle layer, without breaking the outermost layer, Further, it is characterized in that it has a bent line portion for a bent layer formed by breaking at least a part of the middle layer. According to the invention described above, due to the difference in tensile elongation at break between the outermost layer and the middle layer, only the middle layer is broken by performing the pressing groove processing, and the outermost layer is continuous without breaking. Therefore, by breaking only the middle layer, the folding strength is reduced, and a line portion having good folding suitability is formed.

Further, in the transparent sheet according to the present invention, in the above transparent sheet, the material of the synthetic resin layer is a polyolefin resin, and the cellophane layer or the polylactic acid layer A polyolefin-based resin film is bonded to at least one surface of the resin film, the polyolefin-based resin film has a textured surface on a side facing the resin film, and the resin film is formed of the polyolefin-based resin film. The resin film is characterized in that the resin film is bonded to the textured surface via an adhesive layer having substantially the same refractive index as the polyolefin resin film.

According to the above invention, the adhesion between the films can be prevented when the polyolefin-based resin film is stored or the like by reducing the contact area between the films by providing unevenness on the bonding surface of the polyolefin-based resin film. . In this case, although the transparency of the film itself is lost by subjecting the polyolefin-based resin film to unevenness, the cellophane is formed through an adhesive layer having a refractive index substantially the same as that of the polyolefin-based resin film when forming the sheet. The transparency can be restored by laminating the resin film comprising a layer or a polylactic acid layer.

Further, a transparent case according to the present invention comprises the above transparent sheet.

According to the above invention, a transparent case that is environmentally friendly, has sufficient strength, and has excellent moisture resistance can be provided. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view of a conventional 入り -lined sheet.

FIG. 2 is a cross-sectional view of a conventional transparent sheet.

FIG. 3 is a diagram showing a state in which a polyolefin resin film used for a conventional transparent sheet is wound into a roll.

FIG. 4 is a perspective view of a transparent case using the transparent sheet according to the present invention.

FIG. 5 is a partial view of the transparent sheet according to the present invention.

FIG. 6 is a cross-sectional view of a sheet for explaining the state of the g-line-containing sheet according to the present invention at the time of processing of the extra line.

FIG. 7 is a cross-sectional view of the sheet with 鄞 lines according to the present invention.

FIG. 8 is a cross-sectional view of the sheet according to the present invention, showing a state where the sheet is bent.

FIG. 9 is an exploded view of a transparent case using the sheet with 藓 lines according to the present invention. FIG. 10 is an assembly view of a transparent case using the firewood-lined sheet according to the present invention. FIG. 11 is a cross-sectional view of the transparent sheet according to the present invention.

FIG. 12 is a cross-sectional view of the transparent sheet according to Example 1 of the present invention.

FIG. 13 is a cross-sectional view of a transparent sheet according to Example 2 of the present invention.

FIG. 14 is a cross-sectional view of a transparent sheet according to Example 3 of the present invention.

FIG. 15 is a sectional view of a transparent sheet according to Example 4 of the present invention.

FIG. 16 is a sectional view of a transparent sheet according to Example 5 of the present invention.

FIG. 17 is a sectional view of a transparent sheet according to Example 6 of the present invention.

FIG. 18 is a sectional view of a transparent sheet according to Example 7 of the present invention.

FIG. 19 is a sectional view of a transparent sheet according to Example 8 of the present invention.

FIG. 20 is a sectional view of a transparent sheet according to Example 9 of the present invention.

FIG. 21 is a cross-sectional view of a transparent sheet according to Example 10 of the present invention.

FIG. 22 is a cross-sectional view of the transparent sheet according to Example 11 of the present invention.

FIG. 23 is a cross-sectional view of a transparent sheet according to Example 12 of the present invention.

FIG. 24 is a cross-sectional view of a transparent sheet according to Example 13 of the present invention.

FIG. 25 is a graph showing the tensile elongation at break.

FIG. 26 is a sectional view of a transparent sheet according to Example 15 of the present invention.

FIG. 27 is a cross-sectional view of a transparent sheet according to Example 16 of the present invention.

FIG. 28 is a cross-sectional view of a transparent sheet according to Example 18 of the present invention.

FIG. 29 is a cross-sectional view of a transparent sheet according to Example 19 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail.

The transparent sheet of the present invention comprises a cellophane layer or a polylactic acid layer and a synthetic resin layer bonded to one or both sides of the cellophane layer or the polylactic acid layer. As the cellophane used in the present invention, ordinary cellophane known as a cellulosic film can be used. Cellophane thickness used in the present invention Although cellophane differs depending on the application, for example, cellophane having a thickness of 40 μπι is used. The cellophane layer is formed of a single layer or a multilayer of cellophane. The multilayer cellophane layer is formed by bonding cellophane in multiple layers with an adhesive. The thickness of the cellophane layer is preferably 50% or more of the total thickness of the transparent sheet. In the present invention, polylactic acid (borylactide) is used instead of cellophane, and polylactic acid having the same structure as the cellophane layer is used. A layer may be formed. In the following explanation,

The cellophane or polylactic acid may be called a biodegradable resin, and the cellophane layer or polylactic acid layer may be called a biodegradable resin layer.

As the synthetic resin used in the present invention, polyethylene terephthalate, polypropylene, polyethylene or the like can be used. The synthetic resin layer is a layer made of the above synthetic resin.

In the present invention, the use of a biodegradable resin other than cellophane and polylactic acid is not excluded.

During use, such biodegradable resins maintain the same level of function as ordinary resins, but after use they are decomposed into low molecular weight compounds by the action of microorganisms existing in nature, and finally carbonated. A polymer material that can be decomposed into inorganic substances such as gas and water can be used. Specific examples include biosynthetic biodegradable plastics such as polycaprolactone, polybutylene succinate, polyethylene succinate, and polyethylene terephthalate improved type.

The biodegradable resin layer is a layer made of the biodegradable resin. The biodegradable resin layer is formed of a single layer or multiple layers of the biodegradable resin. The multi-layered biodegradable resin is formed by laminating the biodegradable resin with an adhesive.

Cellophane and cellophane, cellophane layer and synthetic resin layer, cellophane layer and biodegradable resin layer, biodegradable resin and biodegradable resin, biodegradable resin layer and synthetic resin layer An adhesive can be used. Note that when bonding cannot be performed with an adhesive, bonding can be performed by welding or the like.

FIG. 4 shows an example of a transparent case obtained from the transparent sheet according to the present invention.

In order to obtain the transparent case 10 shown in FIG. 4, first, the transparent sheet according to the present invention is The sheet is punched into a predetermined plane shape suitable for forming the final product, and the sheet is punched into this plane shape, and a folding wire (firewood wire processing section) is formed on a transparent sheet. The folding wire is processed by pressing a wire drawing blade against a surface located inside when the transparent sheet is folded. The transparent case 10 is formed by bending along the folding firewood wire. The transparent case 10 according to the present invention is environmentally friendly. The transparent case 10 has sufficient strength. Further, the transparent case 10 is transparent and allows the inside to be seen, so that the case is suitable for storing articles such as cosmetics. The shape and size of the transparent case can be arbitrarily determined depending on the application.

It is not excluded that a transparent case is formed using a transparent sheet composed of only a single layer of biodegradable resin. In this case, by using a chemically synthesized biodegradable plastic as the biodegradable resin, an environment-friendly transparent case can be obtained.

Next, the transparent sheet of the present invention having a dashed line will be described.

As shown in FIG. 5, the transparent sheet 12 has a structure in which outermost layers 14, 16 and three middle layers 18, 20, 22 are laminated.

As the material of the outermost layers 14 and 16 of the transparent sheet 12, a resin having a tensile elongation at break higher than the elongation at break of the materials of the middle layers 18, 20, and 22 is used. Preferably, the material of the outermost layers 14, 16 has a tensile elongation at break of 200% or more, and the material of the middle layers 18, 20, 22 has a bow I elongation at break of less than 200%.

Here, it is necessary that the tensile elongation at break of the material of the outermost layers 14, 16 be larger than the tensile elongation at break of the material of the middle layers 18, 20, 22. If the elongation is smaller than the tensile elongation at break of the material of the middle layers 18, 20, and 22, the outermost layers 14, 16 will break before the middle layers 18, 20, and 22 during wire drawing. This is because a ray cannot be formed only on 8, 20, and 22. Further, the tensile elongation at break of the material of the outermost layers 14 and 16 is preferably 200% or more, when the elongation at break of the material of the outermost layers 14 and 16 is less than 200%. This is because 16 tends to be broken at the time of wire drawing, and it becomes difficult to form a sheet with a collecting wire.

Thus, the material of the outermost layer 14, 16 of the transparent sheet 12 is the middle layer 18, 20, 22 Any resin may be used as long as it has a tensile elongation at break higher than the tensile elongation at break of the material of Example 22, such as polypropylene, polyethylene or polyethylene terephthalate. It is preferable to use.

The material of the middle layer 18, 20, 22 of the transparent sheet 12 may be any resin as long as it has a tensile elongation at break lower than that of the outermost layer 14, 16 material. For example, cellophane or polylactic acid can be used. In addition, the »lined sheet of the present invention may have a three-layer structure including at least one outer layer and at least one outer layer, and another layer may be disposed in the intermediate layer as needed. For example, a three-layer structure in which two outermost layers and one middle layer are stacked, or a six-layer structure in which two outermost layers and four middle layers are stacked can be used. it can.

Next, a sheet (transparent sheet) containing a black line in which a transparent line (formed portion) is formed on the transparent sheet 12 will be specifically described.

FIG. 6 is a cross-sectional view of the 入り -lined sheet according to the present invention at the time of 鄞 -line processing. FIG. 7 is a cross-sectional view of the 入り -lined sheet according to the present invention. Further, FIG. 8 is a partial cross-sectional view showing a state where the S-line-containing sheet according to the present invention is folded. As shown in Fig. 6, by applying the wire blade 24 from the outermost layer 14 side of the transparent sheet 12 and pressing the wire blade 24 deeper than the thickness of the outermost layer 14, all the middle layers 18 Break, 20 and 22. As a result, the bending S-line processed part 26 shown in FIG. 7 is formed.

In this case, depending on the composition and bending angle of the sheet, the required bendability and strength, only some of the middle layers 18, 20, 20 and 22 are broken, for example, only the middle layers 18 and 20 are broken. A vertical line may be formed.

As described above, the material of the outermost layers 14 and 16 includes a resin having a breaking elongation higher than the material of the middle layers 18, 20 and 22, that is, the middle layers 18 and 20. The outermost layers 14 and 16 do not break (continuous state) because they use a resin that stretches better than the material of 22. On the other hand, the middle layers 18 and 20 and 22 break, respectively. . As a result, a line-containing sheet (transparent sheet) 28 having a line-processed portion 26 generated by breaking only the middle layers 18, 20, and 22 is completed. Use the voice line sheet 2 8 When used, as shown in FIG. 8, the outermost layer 16 is usually folded inside, but it is also possible to bend in the opposite direction, that is, with the outermost layer 14 on the cutting edge side inside.

In order to produce a transparent case using the sheet 28 with the bright line according to the present invention, a sheet 28 a with the bright line processed in accordance with the shape of the case shown in a development view in FIG. 9 is prepared, By assembling the ascending line sheet 28a, the transparent case 30 shown in FIG. 10 is completed. Note that, in FIG. 9, a broken line 32 indicates a 鄞 -line processed portion.

Next, a case where the synthetic resin as the material of the synthetic resin layer constituting the transparent sheet is a polyolefin resin will be described below.

FIG. 11 is a diagram for explaining the transparent sheet according to the present invention. The present invention described below is also applicable to sheets other than transparent sheets.

As shown in FIG. 11, the transparent sheet 34 according to the present invention includes a transparent resin film 36 and a polyolefin resin film 38 bonded to at least one surface of the transparent resin film 36. (In FIG. 11, the polyolefin resin film 38 is adhered to only one side of the transparent resin film 36.) The transparent resin film 36 is a highly transparent resin film, and it is preferable to use a biodegradable resin film such as cellophane or polylactic acid in consideration of the environment. However, a non-transparent resin film may be used depending on the use conditions.

The polyolefin resin used in the polyolefin resin film 38 is, for example, a resin selected from the group consisting of ethylene copolymers such as polyethylene, polypropylene, ethylene monoacetate copolymer, and ethylene propylene copolymer. Alternatively, a mixture of two or more is used.

The thickness of the polyolefin resin film 38 is preferably from 60 μπι to 100 μm. When the thickness is in the range of 60 μπι to 100 μπι, the transparency of the transparent sheet 34 is ensured.

The polyolefin-based resin film 38 has a concave-convex processed surface 40 formed by performing a concavo-convex processing on a surface on the side arranged to face the transparent resin film 34 before bonding. By providing the uneven surface 40, when the polyolefin resin film 38 is wound into a roll at the time of storage, etc. Since the contact area can be reduced, it is possible to prevent the polyolefin-based resin film 38 from being stretched during rewinding.

Further, the polyolefin resin film 38 is subjected to corona treatment on both sides similarly to the conventional example, in order to improve the adhesiveness.

For example, the conditions of the corona discharge treatment performed using a corona discharge tube are preferably such that the primary voltage is 10 to 30 kV and the primary current is 2 to 6 A. The corona discharge treatment machine used for the corona treatment may be any one of a spark gap system, a vacuum tube system, and a solid state system, and is not particularly limited. As described above, the outer surface of the polyolefin-based resin film 38 that is not opposed to the transparent film 36 is also subjected to corona treatment in order to make it easier to ride ink during printing, but this outer surface is made of a polyolefin-based resin film. When forming the resin film 38, a mirror finish is applied.

The transparent sheet 34 is obtained by bonding the transparent resin film 36 to the uneven surface 40 of the polyolefin resin film 38 via the adhesive layer 42.

In this case, it is not necessary to use a special adhesive for the adhesive layer 42, but it is preferable that the adhesive is bonded to the polyolefin resin film 38 which forms the outermost layer (one side) of the transparent sheet 34. The agent layer 42 is formed of a material having the same refractive index. By providing the adhesive layer 42, the surface of the uneven surface 40 of the polyolefin resin film 38 can be made smooth, and the transparency of the transparent sheet 34 can be ensured. Furthermore, since the polyolefin-based resin film 38 and the adhesive layer 42, which form the outermost layer (one side) of the transparent sheet 34, are formed of a material having the same refractive index, the transparent resin film starts from the outermost layer. Since the refractive indexes up to 36 are equal, the transparency of the transparent sheet 34 can be further secured.

Since the transparent sheet 34 of the present invention is formed with a textured surface 40, a conventional polyolefin film, which has been subjected to a lip treatment on both sides, comes into close contact when rolled into a wool shape. Problem is solved. In this case, the transparency of the polyolefin-based resin film 38 itself is lost only by forming the textured surface 40, but the transparent sheet 34 as a whole is bonded by bonding through the adhesive layer 42. Sex can be restored.

In the transparent sheet 34 of the present invention, since the adhesive layer 42 is provided so as to be in contact with the uneven surface 40 of the polyolefin-based resin film 38, the adhesive layer 42 can be used for bonding to a film having a flat surface. As compared with the case, the contact area between the film and the adhesive is increased, and the adhesive strength between the transparent resin film 36 and the polyolefin resin film 38 can be improved.

A method for producing the transparent sheet 34 of the present invention will be described.

First, the polyolefin resin extruded from the extruder and in a molten state is formed into a sheet by a cooling roll having a mirror surface and an uneven surface, and an uneven surface 40 is formed on one surface and a mirror surface is formed on the other surface. The formed polyolefin resin film 38 is obtained. Next, the polyolefin resin film 38 formed into a sheet is subjected to corona discharge treatment using a corona discharge tube. After the corona discharge treatment, an adhesive application step is provided, and the adhesive is applied to form an adhesive layer 42. The transparent resin film 36 is set so as to be sent out from a separately provided feed roll.

Next, the sent transparent resin film 36 is pressure-bonded and joined so as to be in contact with the uneven surface 40 of the polyolefin-based resin resin film 38 that has been subjected to the corona discharge treatment. Then, a polyolefin resin film 38 is laminated thereon, and a transparent sheet 34 is obtained.

A transparent case is obtained by assembling the transparent sheet 34 in the same procedure as in the case of the transparent case 30 described above.

Hereinafter, preferred embodiments of the present invention will be described.

Examples 1 to 13 relate to the transparent sheet of the present invention comprising a cellophane layer or polylactic acid layer and a synthetic resin layer bonded to one or both sides of the cellophane layer or polylactic acid layer. This is an example.

[Example 1]

As shown in Fig. 12, on one side of a cellophane layer 44 composed of cellophane (thickness: 40 m) (made by Nineo Chemical Industries; ordinary cellophane PL # 500), a polyethylene terephthalate (thickness: 50 μππι) was formed. A synthetic resin layer 46 composed of Toyobo; Toyobo ester) is bonded with an adhesive to form a transparent sheet. At this time, gravure roll coating An adhesive dissolved in an organic solvent is applied to at least one of the cellophane layer 44 and the synthetic resin layer 46 by a method, dried with hot air, and then bonded together (dry basis weight 2 gZm ² ). Note that this bonding method is the same in the other embodiments described below, and a duplicate description will be omitted.

[Example 2]

As shown in Fig. 13, a 20 μπι thick polypropylene (Toyobo; “PYREN” film CT) is coated on one side of a cellophane layer 44 made of cellophane 40 μπ thick (Nichimura Chemical Co., Ltd .; ordinary cellophane PL # 500). The synthetic resin layer 46 is bonded with an adhesive to form a transparent sheet.

[Example 3]

As shown in Fig. 14, a 20 m / zm thick polyethylene terephthalate (Toyobo; Toyobo Ester) was formed on both sides of a cellophane layer 44 made of cellophane 40 m in thickness (manufactured by Nimura Chemical Co., Ltd .; ordinary cellophane PL # 500). The synthetic resin layer 46 is bonded with an adhesive to form a transparent sheet. In Example 3, the same synthetic resin, polyethylene terephthalate, is bonded to both sides of the cellophane layer 44. Different types of synthetic resins can be bonded together.

[Example 4]

As shown in Fig. 15, one side of a cellophane layer 44 made of cellophane with a thickness of 40 inches (manufactured by Nimura Chemical Co .; ordinary cellophane PL # 500) has a polylactic acid layer made of polylactic acid with a thickness of 100 μπι (biodegradable). Resin layer) 48 is bonded with an adhesive to form a transparent sheet.

[Example 5]

As shown in FIG. 16, a transparent sheet is formed by bonding a polylactic acid layer 48 made of polylactic acid having a thickness of 100 m to both sides of a cellophane layer 44 made of cellophane having a thickness of 40 μm with an adhesive.

[Example 6]

As shown in Fig. 17, four cellophane layers 44 each made of cellophane (Nichimura Chemical Co., Ltd .; ordinary cellophane PL # 500) having a thickness of 40 μιη are bonded together with an adhesive to form a cellophane multilayer body (cellophane layer). ) To form a transparent sheet with this cellophane multilayer And

[Example 7]

As shown in Fig. 18, four cellophane layers 44 made of cellophane (Nichimura Chemical Co., Ltd .; ordinary cellophane PL # 500) each having a thickness of 40 zm are bonded together with an adhesive to form a cellophane multilayer body (cellophane layer). ) Is formed, and a synthetic resin layer 50 of 50 μπι thick polypropylene (manufactured by Toyobo; “Pyrene” film CT) is adhered to one side with an adhesive to form a transparent sheet.

[Example 8]

As shown in Fig. 19, four cellophane layers 44 made of cellophane (Nichimura Chemical Co., Ltd .; ordinary cellophane PL # 500) each having a thickness of 40 / m are bonded together with an adhesive to form a cellophane multilayer body (cellophane layer). A synthetic resin layer 50 of 50 / zm thick polypropylene (manufactured by Toyobo; "Pyrene" film CT) is bonded to both sides with an adhesive to form a transparent sheet.

[Example 9]

As shown in Fig. 20, a four-layer polylactic acid layer 48 made of polylactic acid with a thickness of 100 μπι is bonded together with an adhesive to form a biodegradable resin multilayer (biodegradable resin layer). The biodegradable resin multilayer body is a transparent sheet.

(Example 10)

As shown in FIG. 21, a synthetic resin layer 50 made of polyethylene terephthalate (manufactured by Toyobo; Toyobo ester) having a thickness of 50 μπι is adhered to one side of a polylactic acid layer 48 made of polylactic acid having a thickness of 100 // m with an adhesive. In addition, it is a transparent sheet.

[Example 11]

As shown in FIG. 22, all of the four polylactic acid layers 48 made of polylactic acid having a thickness of 100 Aim are bonded together to form a biodegradable resin multilayer body (biodegradable resin layer). On one side, a synthetic resin layer 52 of 50 μπι thick polypropylene (manufactured by Toyobo; “PYREN” film CΤ) is attached with an adhesive to form a transparent sheet.

[Example 12]

As shown in Fig. 23, all of the four polylactic acid layers 48 made of polylactic acid having a thickness of 100 / zm are bonded together with an adhesive to form a biodegradable resin multilayer (biodegradable resin layer). A synthetic resin layer 52 made of polypropylene (manufactured by Toyobo; Pyrene film CT) having a thickness of 50 m is attached to both sides with an adhesive to form a transparent sheet.

[Example 13]

As shown in FIG. 24, the six layers are bonded with an adhesive to form a transparent sheet. The first and sixth layers are both synthetic resin layers 54 and 56 made of polypropylene (manufactured by Idemitsu Unitech; “Super Softy”) having a thickness of 80 μΐη. Each of the second to fifth layers is a cellophane layer 58, 60, 62, 64 made of cellophane (manufactured by Nimura Chemical Industries; moisture-proof cellophane AZ-2 # 300) having a thickness of 21 μπι.

Next, Examples 14 to 17 are examples in which the transparent sheet has a firewood wire portion. The physical properties of the sheet in each example were measured by the following methods.

Tensile breaking elongation

The sample was cut into strips with a width of 10 mm, and the measurement length was set to 50 mm, and the specimen was processed at a tensile speed of 10 Omm / min by a tensile tester. The difference between the distance between the chucks when the sheet was broken and the measured length was divided by the measured length to determine the tensile elongation at break (%). Figure 25 shows the tensile breaking elongation obtained as described above.

Fold strength factor

In this embodiment, the folding strength (N) refers to the strength when the sheet is bent, and the folding strength ratio (%) refers to the folding strength of the sheet after go-line processing (N). Fold strength (N).

Flexural strength measurement method

In this example, the bending strength was determined by cutting out a sheet of 5 cm × 10 cm centering on the yellow line, fixing one side of the sample horizontally, and centering the other side in the width direction (25 mm from the end), and the black line. The pressure was applied at a position of 17 ± 2 mm from the center, and the pressing force at that time was measured with a push-pull gauge.

[Example 14]

In Example 14, the three cellophane layers 18, 20, and 22 were laminated in multiple layers with an adhesive, and the polypropylene layers 14 and 16 were laminated on both sides thereof. A transparent sheet as shown in 5 was produced. The first layer (reference numeral 14) is the outermost layer of the transparent case, and is made of polypropylene (trade name: "Spar Softy", manufactured by Idemitsu Unititec, tensile elongation at break = 530%). . For the second layer (reference numeral 18), cellophane (trade name: ordinary cellophane PL # 500, manufactured by Nimurai Danigaku Kogyo Co., Ltd., tensile elongation at break = 26%) was used as a resin. In the third layer (reference numeral 20) and the fourth layer (reference numeral 22), cellophane was used as a resin similarly to the second layer. The fifth layer (reference numeral 16) is the outermost layer of the transparent case and uses the same resin as the first layer (the thickness of each layer of the transparent sheet is 80 111 for the first layer and 80 for the second layer). The layer is 35 / im, the third layer is 35 μπι, the fourth layer is 35 μm, and the fifth layer is 80 μπι.

The transparent sheet is obtained by applying an adhesive melted in an organic solvent by a gravure roll coating method, drying with hot air, and laminating the first to fifth layers. In addition, as shown in Fig. 6, in order to prevent the polypropylene of the outermost layer 14 from being broken, a beveled wire is used. Was pressed.

As a result, a transparent sheet having a 5-wire processed portion 28 in which only the middle layers 18, 20, and 22 were broken was formed without breaking the outermost layers 14, 16 (in a continuous state). At this time, the processing conditions were cold, but the processing can be performed by heating the S-line blade 24. As shown in Fig. 8, the thus obtained »lined sheet 28 was bent at the bent portion 28 with the cutting edge side outward, and good bending properties were obtained. Was done. In the bent portion, the first layer and the fifth layer constituting the force bending portion 28 for which the bending test was repeated 50 times were not broken at all.

[Example 15]

In Example 15, as shown in FIG. 26, four cellophane layers 18, 20, 22, and 23 were laminated in multiple layers with an adhesive, and polypropylenes 14 and 16 were laminated on both surfaces of the cellophane layers. A transparent sheet having a thickness of 300 was produced.

The first layer (reference numeral 14) is the outermost layer of the transparent case, and is made of polypropylene (trade name: “Super Softy”, manufactured by Idemitsu Unitech, tensile elongation at break = 530%). The second layer (reference number 18) is made of cellophane as resin. Product name: Normal cellophane PL # 500, manufactured by Nimura Chemical Industry, tensile elongation at break = 26%) was used. The third layer (reference numeral 20), the fourth layer (reference numeral 22), and the fifth layer (reference numeral 23) used cellophane as a resin similarly to the second layer. The sixth layer (reference numeral 16) is the outermost layer of the transparent case, and is made of the same resin as the first layer. The thickness of each layer of the transparent sheet is 80 μπι for the first layer, 35 μπι for the second layer, 35 / xm for the third layer, 35 μπι for the fourth layer, 35 μπι for the fifth layer, and 80 μπι for the sixth layer. is there. The above transparent sheet was produced in the same procedure as the transparent sheet of Example 14. Further, a transparent case was produced using the above transparent sheet in the same procedure as in the transparent case of Example 14. The thus obtained transparent sheet with a valley line had good folding properties. In addition, cosmetics were placed in the obtained transparent case, and the strength was compared with that of the conventional clear case with S-rays of the same dimensions. I never did.

In Example 15, when the bending strength ratio was measured, the bending strength of the sheet after the wire drawing was 0.9 (Ν) / the sheet before the wire drawing was 3.6 (Ν). The folding strength ratio was 25 (%). As described above, the folding strength ratio is preferably 50% or less and 1.0 (Ν) or less.

[Example 16]

In Example 16, polypropylenes 14 and 16 were adhered to both surfaces of the polylactic acid layer 48 to produce a transparent sheet having a total sheet thickness of 300πι as shown in FIG.

The first layer (reference numeral 14) was the outermost layer of the transparent case, and was made of polypropylene (trade name: “Super Softy”, manufactured by Idemitsu Unitech, tensile elongation at break = 530%). For the second layer (reference numeral 48), polylactic acid (trade name: Reisha, manufactured by Mitsui Chemicals, tensile elongation at break = 4.0%) was used as a resin. The third layer (reference numeral 16) is the outermost layer of the transparent case, and is made of the same resin as the first layer. The thickness of each layer of the transparent sheet is 100 μιη for the first layer, lOO / m for the second layer, and 100 μm for the third layer.

A transparent sheet and a transparent case were produced in the same procedure as in Example 14. The S-line-containing transparent sheet thus obtained had good bending properties. Also obtained As a result of putting the cosmetics in the transparent case and comparing the strength with that of the conventional PP clear case having the same size as that of the conventional clear line, it is practically possible that no tearing or breakage will occur in the processed part of the plied wire. .

[Example 17]

In Example 17, three sheets of cellophane layers 18, 20, and 22 were laminated with an adhesive by using a sheet as previously shown in FIG. 1, and a polyethylene terephthalate layer 14, By pasting 16 together, a transparent sheet as shown in FIG. 5 having a total thickness of 255 μm was prepared.

The first layer (reference numeral 14) formed the outermost layer of the transparent case, and used polyethylene terephthalate (trade name: “Teflex”, manufactured by Teijin, tensile elongation: 51%) as the resin. For the second layer (reference numeral 18), cellophane (trade name: ordinary cellophane PL # 500, manufactured by Futmura Chemical Industries, tensile elongation at break = 26%) was used as the resin. In the third layer (reference numeral 20) and the fourth layer (reference numeral 22), cellophane was used as a resin similarly to the second layer. The fifth layer (reference numeral 16) is the outermost layer of the transparent case and is made of the same resin as the first layer.

The thickness of each layer of the transparent sheet is 75 μπι for the first layer, 35 μπι for the second layer, 35 / im for the third layer, 35 μπι for the fourth layer, and 75 / im for the fifth layer.

A transparent sheet and a transparent case were produced in the same procedure as in Example 14. Since the tensile elongation at break of polyethylene terephthalate of the outermost layer 14 and the cellophane elongation at break of cellophane of the middle layers 18, 20, and 22 are very close as shown in FIG. It took me careful.

The thus-obtained transparent sheet with 藓 -rays had good bendability. Next, Examples 18 and 19 are examples in which the synthetic resin forming the transparent sheet is a polyolefin resin.

[Example 18]

FIG. 28 is a diagram showing a transparent sheet in Example 18. As shown in FIG. 28, the transparent sheet is bonded to a transparent resin film 66 made of polylactic acid (trade name: “Reishia”, manufactured by Mitsui Chemicals, thickness 150 / zm) 66 and one surface of the transparent resin film 66. Resin film made of polypropylene (trade name: "Supasofo Made by Idemitsu Unitite, thickness ニ、 Ο μ πι) 68. The resin film 68 has a concave / convex processing surface 40 on which a concave / convex processing is performed on the side facing the transparent resin film 66. The transparent film 66 is bonded to the uneven surface 40 of the resin film 68 via an adhesive layer 42.

The transparent sheet in this example is manufactured by the method described below. First, the polypropylene extruded from the extruder and in a molten state is formed into a sheet shape by a cooling roll having a mirror surface and an uneven surface, and the uneven surface 40 and the mirror surface 40a are formed. Corona discharge at a primary voltage of 15 kV and a primary current of 5 A using a corona discharge tube on each of the concave-convex processed surface 40 and the mirror surface 40 a of a polypropylene resin film 68 formed into a sheet. Perform processing. After the corona discharge treatment, an adhesive application step is provided, and the adhesive is applied to form an adhesive layer 42. The transparent resin film 66 is set so as to be sent out from a separately provided feed roll.

Next, the resin film 68 is pressed and bonded to the fed transparent resin film 66 so as to be in contact with the uneven surface 40 of the resin film 68 subjected to the corona discharge treatment. As a result, a transparent sheet in which a resin film 68 made of polypropylene is laminated on the transparent resin film 66 made of polylactic acid via the adhesive layer 42 is obtained. When a transparent case was produced using the obtained transparent sheet, a good case could be obtained.

[Example 19]

FIG. 29 is a diagram showing a transparent sheet in Example 19. As shown in FIG. 29, the transparent sheet in this example is composed of four cellophane layers 70 made of cellophane (trade name: ordinary cellophane PL # 500, manufactured by Futmura Chemical Industries, each 40 μπι). A transparent resin film layer formed by laminating multiple layers using adhesives 42 and a resin film made of polypropylene laminated on both sides of the transparent resin film layer (trade name: “Super Softy J, Idemitsu Unitech, M) 72. The resin film 72 has a textured surface 40 on which a textured surface is formed on the side facing the transparent resin film layer. Are bonded to the uneven surface 40 of the resin film 72 via the adhesive layer 42. The above transparent sheet can be manufactured by the same manufacturing method as that of the transparent sheet of Example 18. When a transparent case was produced using the obtained transparent sheet, a favorable case could be obtained.

Although the preferred embodiments 1 to 19 of the present invention have been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible. Embodiments can be employed.

(1) A transparent sheet having a cellophane layer made of biodegradable cellophane, wherein the cellophane layer is formed by laminating biodegradable cellophane in multiple layers. . In this case, since the transparent sheet is made of biodegradable cellophane, it can be made an environmentally friendly transparent sheet.Because it is formed by bonding cellophane in multiple layers, it has sufficient strength. It can be a transparent sheet.

(2) A transparent sheet comprising a cellophane layer made of biodegradable cellophane and a biodegradable resin layer made of a biodegradable resin bonded to one or both sides of the cellophane layer. In this case, biodegradable cellophane is used for the transparent sheet, making it an environmentally friendly transparent sheet. In addition, since the biodegradable resin layer is bonded to the cellophane layer, strength is improved. It is possible to obtain a transparent sheet having sufficient transparency.

(3) The transparent sheet according to (2) above, wherein the cellophane layer is formed by laminating biodegradable cellophane in multiple layers. In this case, since the cellophane is laminated in multiple layers, a transparent sheet having more sufficient strength can be obtained.

(4) A transparent sheet having a biodegradable resin layer made of a biodegradable resin, wherein the biodegradable resin layer is formed by laminating a biodegradable resin in multiple layers. provide. In this case, since the transparent sheet is formed of a biodegradable resin, it can be made an environmentally friendly transparent sheet, and since the biodegradable resin is laminated and formed, sufficient strength is obtained. It can be a transparent sheet.

(5) A biodegradable resin layer composed of a biodegradable resin, and one or both sides of the biodegradable resin layer. Provided is a transparent sheet comprising a synthetic resin layer as a reinforcing material bonded to a surface. In this case, since the biodegradable resin is used for the transparent sheet, an environmentally friendly transparent sheet can be obtained, and since the synthetic resin layer is bonded to the biodegradable resin layer, the strength is sufficient. In the transparent sheet.

(6) The transparent sheet according to the above (5), wherein the biodegradable resin layer is formed by laminating a biodegradable resin in multiple layers. In this case, since the biodegradable resin is laminated in multiple layers, a transparent sheet having more sufficient strength can be obtained.

(7) The transparent sheet described above, wherein the biodegradable resin layer is made of a chemically synthesized biodegradable plastic.

(8) In the above transparent sheet, the synthetic resin layer provides a transparent sheet made of polyethylene terephthalate, polypropylene or polyethylene.

(9) A transparent sheet having a linear portion, wherein the thickness of the entire sheet is from 100 / m to 500 μπι.

(10) A transparent sheet having a linear portion, wherein the outermost layer is made of polypropylene, polyethylene or polyethylene terephthalate.

Claims

The scope of the claims

1. A transparent sheet comprising a cellophane layer or a polylactic acid layer, and a synthetic resin layer bonded to one or both sides of the cellophane layer or the polylactic acid layer.

2. In the transparent sheet described in claim 1,

The transparent sheet, wherein the mouth opening layer or the polylactic acid layer is laminated in multiple layers.

3. In the transparent sheet according to claim 1 or 2,

The synthetic resin that is the material of the synthetic resin layer has a higher tensile elongation at break than the cellophane or polylactic acid that is the material of the cellophane layer or the polylactic acid layer. And an outermost layer of the synthetic resin layer on both outer sides of the intermediate layer,

A transparent sheet having a 鄞 -line portion for bending formed by breaking at least a part of the middle layer without breaking the outermost layer.

4. In the transparent sheet according to claim 1 or 2,

The material of the synthetic resin layer is a polyolefin resin,

A polyolefin-based resin film is bonded to at least one surface of the resin film comprising the cellophane layer or the polylactic acid layer,

The polyolefin-based resin film has a textured surface on a side facing the resin film,

A transparent sheet, wherein the resin film is bonded to the uneven surface of the polyolefin resin film via an adhesive layer having the same refractive index as the polyolefin resin film.

5. A transparent case comprising the transparent sheet according to any one of claims 1 to 4.