TWI555684B - Plastic sheet with ruled line, ruled line knife for the plastic sheet and packaging container - Google Patents

Description

Plastic sheets with curved grids, ruled knives and packaging for plastic sheets container

The invention relates to a plastic sheet with a curved line and a ruled line cutter, which bends a sheet along a curved ruled line attached to the surface, thereby The plastic sheet with the bent ruled line is assembled into a packaging container for display, and the ruled line cutter is used to attach the ruled line to the sheet.

The following packaging container is used as a container in which items such as cosmetics or daily necessities are stored and displayed for sale, and the packaging container is a container in which a transparent plastic sheet is bent and assembled into a box shape.

The plastic sheet assembled into a box-shaped container is formed with a bent ruled line on the surface, but in the case of a substantially V-shaped cross section substantially corresponding to the sharp edge of the ruled edge of the ruled line cutter, The bending ruled line is formed deeper in the thickness direction of the plastic sheet, and when the plastic sheet is bent along the bending ruled line, it is easy to be at an acute angle portion of the bottom portion of the ruled line having a thin wall thickness Cracks or holes are formed; on the other hand, when the bent ruled line is formed shallowly in the plastic sheet, the bending property of the plastic sheet is lowered, and assembly work for assembling into a container is difficult, and it is easy to follow along The bent portion of the bent ruled line is warped or wrinkled, and the aesthetic appearance of the assembled container is deteriorated.

Therefore, in order to simultaneously satisfy the bending strength to the extent that the crack does not occur, and the bending property which does not hinder the assembly work, as shown in FIG. 20, the so-called "rope lattice" has been developed by the present inventors. a plastic sheet 100 of the line, the plastic sheet 100 is bent at the bottom portion 102 of the ruled line 101 A thin knot-like ridge 103 is provided in the shape of the entire bottom surface portion 102 (see, for example, Patent Document 1).

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2003-292023

The bent ruled line 101 shown in FIG. 20 can obtain sufficient bending strength even when formed on a sheet having a small stretch ratio such as biodegradable plastic, and can use a slight force to make the plastic sheet. A crease is generated, but sometimes the bending property is too good, and the resilience of the plastic sheet bent along the bending ruled line is lowered.

In this case, if the plastic sheet is stored in a state of being folded along the bending ruled line before being assembled into the packaging container, it is difficult to perform a work of three-dimensionally folding the plastic sheet into a flat shape. When the external force is applied to the packaging container assembled in a box shape and the packaging container is deformed, it is difficult to return to the original shape. Further, the bent portion of the plastic sheet 100 to which the bent ruled line 101 is attached has low durability, and if the plastic sheet 100 is repeatedly assembled and unfolded, cracks easily occur along the bent ruled line 101.

In view of the above-described problems of the prior art, an object of the present invention is to obtain a good bending property and a bending strength without lowering the resilience of a plastic sheet bent along a bending ruled line. Plastic sheet with curved grid lines.

In order to solve the above problems, the present invention is to provide a concave surface on the surface. a plastic sheet with a curved ruled line for bending a ruled line, wherein the plastic sheet with the bent ruled line is characterized by: setting a bottom surface portion of the curved ruled line to a curved cross-sectional shape, Further, a convex portion is formed in the bottom surface portion, and the convex portion is raised from the surface of the bottom surface portion, and the convex portion is extended in a direction obtained by inclining a predetermined angle in a direction in which the ruled line is attached.

In addition, the present invention is a ruled knives for a plastic sheet, which is used when a concave bent ruled line is attached to a bent portion of a plastic sheet, and the front end portion of the plastic sheet is set to The curved cross-sectional shape of the plastic sheet is characterized in that: a concave blade portion is arranged at a front end portion of the ruled wire cutter, and the concave blade portion is at a front end portion of the ruled wire cutter At least the top surface portion, and the concave blade portion extends in a direction obtained by inclining a predetermined angle to an attachment direction of the bending ruled line.

The packaging container of the present invention has a configuration in which a plastic sheet having a bent ruled line or a plastic sheet having a curved ruled line attached to a plastic sheet is used. The bending grid is bent and assembled.

The plastic sheet is, for example, a biodegradable plastic such as polypropylene (PP) or polyester (polyethylene terephthalate (PET)) or polylactic acid (PLA). And a monomer of another resin material or a composite plastic, and includes, for example, a transparent or translucent sheet formed to a predetermined thickness contained in a range of about 0.1 mm to about 1 mm. That is, in the case where the bent ruled line is attached to the plastic sheet, with the plastic sheet The pressure corresponding to the material or the thickness, the strength, and the hardness, etc., is pushed to the bent portions of the plastic sheet by a single block number or a plurality of pieces of the ruled line cutter to form the bent ruled line.

In an embodiment, a plurality of convex portions bulging from a bottom surface portion of the bending ruled line may be arranged at an appropriate interval to form the bending ruled line; or the convex portions may be continuously arranged in the The entire bottom surface portion is formed to form the bending ruled line; and the size of each portion of the bent ruled line including the convex portion may be set to be included in a predetermined range suitable for bending the plastic sheet size of.

Further, the plurality of concave blade portions may be arranged at an appropriate interval to be disposed at a front end portion of the curved ruled blade to form the ruled wire cutter; or the concave blade portions may be continuously arranged in the lattice The entire front end portion of the wire cutter is formed to form the ruled wire cutter; and the size of each portion of the ruled wire cutter including the concave blade portion is set to be suitable for forming a bend attached to the plastic sheet The size contained in the specified range of the grid.

In the above-mentioned grooving knife for plastic sheets and plastic sheets with bent ruled lines, the bending line of the plastic sheet and the blade portion of the ruled line cutter can be set as follows: The size or angle contained in the range.

In other words, as for the bending ruled line, as shown in FIG. 4 to FIG. 8 which will be described later, the depth of the convex portion of the curved ruled line (a1) and the ruled line cutter are also shown in FIG. 10 to FIG. For example, the height (a2) of the blade portion is set to a size (for example, approximately 0.1 mm) included in a range of approximately 0.01 mm to approximately 0.3 mm, and the width (b1) of the convex portion and the width (b2) of the blade portion are, for example, Set to a size in the range of approximately 0.05 mm to approximately 0.8 mm (for example The pitch (c1) of the convex portion and the blade pitch (c2) of the blade portion are set to, for example, a size included in a range of approximately 0.1 mm to approximately 1.0 mm (for example, approximately 0.5 mm). 0.3 mm), the radius of curvature (d1) of the curved bottom portion of the bent ruled line and the radius of curvature (d2) of the tip end of the ruled line cutter are set, for example, to a radius included in a range of 0.1 mm to 1.5 mm (for example, according to plastic The thickness of the sheet, which is approximately 0.4 mm), is inclined at a predetermined angle with respect to the ruled line attachment direction (f) or an angle (e1) of the convex portion intersecting the ruled line attachment direction (f) and a concave knife The angle (e2) of the portion is set, for example, to an angle included in a range of approximately 10 degrees to approximately 90 degrees (for example, approximately 30 degrees), and the thickness (g) of the ruled line cutter is set to approximately 0.5 mm to approximately 2.0 mm. The specified thickness contained in the range.

Further, it is preferable that the width (h) of the meander line is set to a size (for example, approximately 0.6 mm) included in a range of approximately 0.05 mm to approximately 0.8 mm, and is set such that the convex portion occupies a bend The width of the fold line is approximately 80% or more of the width dimension.

If it is the size (for example, depth, height, width, angle, and radius of curvature) included in the range, the size of the convex portion of the bending ruled line and the blade portion of the ruled line cutter can be changed and set to The desired combination. Further, each shape may be set to a specific semi-circular shape, a substantially circular arc shape, a substantially trapezoidal shape, a substantially quadrangular shape, a substantially triangular shape, or the like, or a pair of specific cross-sectional shapes, for example, when viewed from the side. A shape in which a plurality of shapes are combined.

If the depth (a1) and the width (b1) of the convex portion of the bent ruled line and the height (a2) and the width (b2) of the blade portion of the ruled line cutter are respectively set larger than In the setting range, the feel and bending characteristics of the bending line attached to the plastic sheet may be deteriorated. If the setting is smaller than the set range, the strength of the cutting edge may be lowered, and the bending line may not be obtained. The effect is therefore preferably set to the size included in each of the set ranges.

In addition, when the radius of curvature (d2) and the angle (e2) of the blade portion of the ruled cutter are set larger than the set range, when the bent ruled line is attached, a large pressing force is required, and processing is difficult, and The plastic sheet may be warped or wrinkled, and it is difficult to mechanically bend, and the bending property of the plastic sheet is deteriorated. On the other hand, if it is smaller than the above-described setting range, the strength of the blade edge is lowered and the life is shortened. Therefore, it is preferable to set the value included in the setting range.

Further, if the radius of curvature (d1) of the bottom surface portion of the bent ruled line and the angle (e1) of the convex portion with respect to the direction in which the ruled line is attached are set larger than the set range, the bending property of the plastic sheet becomes variable. If the difference is less than the set range, the plastic sheet is easily bent along the bending line, but on the other hand, cracks are likely to occur in the ruled line. Therefore, it is preferable to separately set the set range. The value contained.

Further, it is preferable that an angle (e1) of the convex portion in the direction in which the ruled line of the bending ruled line is attached and an angle (e2) of the blade portion of the ruled ruler are in a range of approximately 10 degrees to approximately 90 degrees. And set to an inclination angle of approximately 15 degrees. If the angle is set to 15 degrees, the plastic sheet can be easily bent along the bending ruled line, and even if the bending is repeated, it is difficult to cause cracks in the ruled line or to cause the sheet to follow along The grid is broken and the bending property and durability are good.

Further, if the width (b1) of the convex portion and the width (b2) of the blade portion are set larger than the set range, the bending property of the plastic sheet may be deteriorated, and if it is set smaller than In the setting range, the strength of the blade edge is lowered, and an effect sufficient to attach the bending ruled line cannot be obtained. Therefore, it is preferable to set the size included in the setting range.

Further, if the width (h1) of the convex portion is less than 80% with respect to the width (h) of the curved ruled line, the bending property of the plastic sheet becomes better, but on the other hand, The resilience is lowered, and it is difficult to perform an operation of pulling up the plastic sheet folded in a flat shape three-dimensionally, and the durability of assembling and unfolding the plastic sheet is also lowered. Preferably, the width (b1) of the convex portion with respect to the width (h) of the bending ruled line is set to a size proportional to the set range.

According to the present invention, the bending ruled line attached to the plastic sheet is set to have a shape in which a plurality of shallow convex portions are arranged in a substantially corrugated manner on the bottom surface portion of the ruled line, and each convex is made The portions are arranged obliquely with respect to the direction in which the ruled lines are attached. Therefore, even if the hand touches the bent portion of the plastic sheet, there is almost no rough feeling, and the packaging container assembled by bending the plastic sheet is good in touch. Even if the fibers such as clothes come into contact with the surface of the packaging container, they are not caught, the fibers do not swell, or a part of the packaging container is not damaged by the contact.

When the bent ruled line of the above-described configuration is attached to the plastic sheet, a portion in which the convex portion is attached in the ruled line is formed in a direction inclined with respect to the direction in which the ruled line is attached, and therefore, the portion of the molecule Density does not get high, even When the bending force is applied to the thin portion (deep portion) of the wall thickness, it is not easily torn, and even in a plastic sheet having a small stretch ratio such as a biodegradable plastic, the bent ruled line can be easily and easily processed. Further, for example, even if cracks, holes, or the like are generated in the meander line, or even to the extent that the crack or hole is generated, the bent ruled line is formed deeper, when it is along the curved ruled line When the plastic sheet is bent, the convex portion is flattened and adhered to each other. Therefore, foreign matter such as dust or moisture is less likely to enter from the bent lattice line in which the crack or the like is generated, and the article stored in the packaging container can be prevented. It is contaminated by the intrusion of foreign matter, so that the quality and commodity value of the article can be maintained.

Further, a portion of the convex portion arranged in the bottom surface portion of the bent ruled line is thick, and a portion on both sides of the convex portion is thin. If the plastic sheet is bent along the curved ruled line, the bottom portion is formed The thin portions of the two portions formed at the both side portions are bent at the center, and therefore, the bending property of the plastic sheet becomes good, and the bending can be smoothly performed. Further, the convex portions are arranged on the bottom surface portion of the bending ruled line, whereby the volume and the wall thickness of the portion where the convex portion is provided are several times or more of the bending ruled line formed in the plastic sheet of the conventional example. Moreover, since the cross section between the convex portion and the convex portion is formed into a curved cross-sectional shape, even when formed in a plastic sheet having a small elongation such as biodegradable plastic, the bending property can be improved, and To ensure proper resilience, after assembly into a packaging container, even if the sheet is repeatedly unfolded, it is not easy to break along the bending line, and the durability of the plastic sheet and the packaging container obtained by assembling the plastic sheet improve.

Preferred embodiments of the present invention will be described based on the drawings.

1 shows a plastic sheet with a bent ruled line for assembling into a packaging container, the packaging container storing an article, for example, the plastic sheet 1 comprising: a transparent having a thickness of about 0.1 mm to about 1 mm. Or a translucent plastic sheet, when the sheet is formed into a shape obtained by unfolding the packaging container in the assembled state shown in FIG. 2 or after being punched into the shape, the left and right side portions are formed by a ruled wire cutter 4 to be described later. 1b, the rear surface portion 1c, the joint portion 1d, the folded portion 1e, the upper surface portion 1f, the lower surface portion 1g, and the bent portion of the folded portion 1h are provided with a concave polygonal line 2, wherein The left and right side surface portions 1b are connected to two side edge portions having a substantially rectangular front surface portion 1a when viewed from the front, and the rear surface portion 1c is connected to a right side edge portion of one side surface portion 1b; The joint portion 1d is connected to the right edge portion of the rear surface portion 1c; the folding portion 1e is connected to the upper and lower edge portions of the side surface portion 1b; and the upper surface portion 1f is connected to the upper edge of the front surface portion 1a. The lower surface portion 1g is connected to the lower edge portion of the front surface portion 1a; the folding portion 1h is connected to the upper surface portion 1f And the following table 1g.

Further, the hole portion (not shown) may be provided in a support portion (not shown) that is connected to the upper edge portion of the rear surface portion 1c, and the hole portion (not shown) is used to hang the assembled portion. A plastic sheet 1 in the form of a container.

The bending ruled line 2 attached to the bent portion of the plastic sheet 1 is a pair of side surface portions 2a and sides that are curved and inclined with a predetermined curvature as shown in FIGS. 3 to 8 The bottom surface portion 2b connected to one end side of the portions 2a and 2a is formed into a substantially curved cross-sectional shape, and the convex portion 3 which is shallower than the maximum depth of the bending ruled line 2 by a predetermined ratio is raised from the surface of the bottom surface portion 2b, and Connected along the bottom surface portion 2b of the curved ruled line 2 in the length direction A plurality of the convex portions 3 are continuously arranged, and as shown in FIG. 4, the convex portions 3 are oriented at a predetermined angle e1 in substantially the same direction (with a curved direction) to the ruled line of the curved ruled line 2. The direction in which the folding directions are different is inclined, and the convex portions 3 are arranged in a substantially streak pattern when viewed from the plane side.

The bending ruled line 2 is formed by setting the thickness of the bottom surface portion 2b to a predetermined thickness included in a range of, for example, approximately 0.08 mm to approximately 0.3 mm.

The depth of the bending ruled line 2 on the convex portion 3 gradually becomes deeper from the central portion of the convex portion 3 toward both end portions, and when the convex portion 3 is viewed from the side surface, the convex portion 3 is smooth. The curved surface is formed into a substantially semicircular shape, and the depth a1 of the convex portion 3 is set to approximately 0.1 mm (see FIG. 5), the width b1 is set to approximately 0.5 mm (refer to FIG. 4), and the valley pitch c1 is set. The convex portion 3 is formed by setting the inclination angle e1 with respect to the ruled line attachment direction f to approximately 30 degrees to approximately 0.3 mm. Further, the radius of curvature d1 of the bottom surface portion 2b of the bending ruled line 2 is set to be approximately 0.4 mm (see FIG. 7).

Further, when the assembly work of the plastic sheet 1 having the above-described configuration is performed mechanically, it is preferable that the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the bent portion of the joint portion 1d are The radius of curvature d1 of the formed lattice line 2 is set to a value (approximately 0.3 mm) that allows bending in a predetermined direction, and is to be bent at the folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g. The radius of curvature d1 of the formed bending ruled line 2 is set to a value (approximately 0.4 mm) that allows bending to the inside and the outside.

On the other hand, the plastic sheet used when the bent ruled line 2 is attached The ruler blade 4 is a pair of side surface portions 4a that are curved and inclined with a predetermined curvature and a top surface portion 4b that is connected to one end side of the side surface portions 4a and 4a, as shown in FIGS. 9 to 15 . Further, in a curved cross-sectional shape, a plurality of blade portions 5 are arranged in the longitudinal direction along the top surface portion 4b of the ruled blade 4, and the blade portion 5 has a concave cross-sectional shape when viewed from the side, and is as shown in FIG. As shown in the figure, the blade portion 5 is inclined at a predetermined angle e2 in a direction substantially the same as the direction f in the ruled line f of the ruled blade 4 (a direction different from the bending direction of the sheet), as viewed from the blade edge side. The concave blade portions 5 are arranged in a substantially streak shape.

The blade portion 5 is formed in a groove shape that gradually becomes shallower from the center portion toward both end portions, and is formed into a substantially semicircular shape hemming so as to have a smooth curved surface when viewed from the side, and the blade portion is formed The height a2 of 5 is set to be approximately 0.1 mm (refer to FIG. 12), the width b2 is set to approximately 0.5 mm (refer to FIG. 11), the cutting edge pitch c2 is set to approximately 0.3 mm, and the inclination angle e2 is set to be relative to the ruled line. The blade portion 5 is formed by attaching an angle f which is substantially inclined by 30 degrees in the direction f.

Further, the radius of curvature d2 of the blade portion 5 is set to be substantially 0.4 mm (see FIG. 14), and the thickness g of the ruled wire cutter 4 is set to a predetermined thickness included in a range of approximately 0.5 mm to approximately 2.0 mm. For the bending ruled line 2 attached to the plastic sheet 1 using the ruled wire cutter 4, the width (b1) of the convex portion with respect to the width (h) of the bending ruled line 2 is formed as: 80 % or more in size.

For example, as shown in FIG. 16, a cutting unit 6 such as a cylindrical raft (rasp) or a wire may be used to continuously align the ruled cutter 4 at a predetermined inclination angle and depth. The curved front end portion is subjected to cutting processing to thereby form the ruled wire cutter 4. Further, depending on the material, thickness, strength, hardness, and the like of the plastic sheet 1, the size of the convex portion 3 constituting the bending ruled line 2 and the blade portion 5 constituting the ruled wire cutter 4 (for example, depth) may be appropriately selected. , height, width, angle, and radius of curvature, etc.) are changed.

Next, the following two methods will be described. One method is to attach the bent ruled line 2 to the plastic sheet 1 by using the above-described ruled wire cutter 4, and the other method is to attach a bent lattice. A method of assembling the plastic sheet 1 of the wire 2.

First, when the bending ruled line 2 is attached, the number or total number of the single blocks shown in FIGS. 9 to 14 is set to a pressure corresponding to the material, thickness, strength, hardness, and the like of the plastic sheet 1. The number of the ruled knives 4 is pushed to the front surface portion 1a and the side surface portion 1b of the plastic sheet 1 which has been punched or stamped into a shape of a predetermined shape obtained by planarly unfolding the packaging container shown in FIG. The curved portion of the rear surface portion 1c and the joint portion 1d, and the bent portions of the folded portion 1e, the upper surface portion 1f, and the bent portion of the lower surface portion 1g are formed as shown in Figs. 3 to 8 Bend the grid line 2. Further, the bending ruled line 2 may be formed by pressing the ruled wire cutter 4 while heating to a predetermined temperature.

On the other hand, when the plastic sheet 1 to which the bent ruled line 2 is attached is assembled into a container shape which is substantially rectangular as viewed from the side as shown in FIG. 2, the plastic sheet can be processed according to the following processing sequence. The material 1 is assembled into a packaging container, and the processing sequence refers to the front surface portion 1a, the side surface portion 1b, the rear surface portion 1c, and the joint in a predetermined direction and angle along the bending ruled line 2. The portion 1d, the folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g are bent. Then, the joint portion 1d connected to one side surface portion and the other side surface portion 1b are bonded by an adhesive. Then, the folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g on the lower edge side are bent inward and closed.

When the packaging container is assembled and the article is stored, the folded portion 1e, the upper surface portion 1f, and the lower surface portion 1g on the upper edge side are temporarily bent outward to be opened, and the article is closed after being stored. Therefore, the operation can be easily performed. Or the work can be easily assembled by using an automatic case former (not shown), or the article can be stored by an automatic storage machine (not shown). Further, the joint portion 1d may be joined and fixed by, for example, welding or high-frequency welding.

According to the present embodiment, the bending ruled line 2 attached to the plastic sheet 1 is provided in such a shape that a plurality of shallow convex portions 3 are arranged in a substantially stud pattern on the bottom surface portion 2b of the ruled line. And the convex portions 3 are arranged obliquely with respect to the direction in which the ruled lines are attached. Therefore, even if the hand touches the bent portion of the plastic sheet 1, there is almost no rough feeling, and the plastic sheet 1 is bent and assembled into a package. The feeling of the container is good, and the fibers such as clothes are not caught even if they come into contact with the surface of the packaging container, the fibers do not swell, or a part of the packaging container is not damaged by the contact.

When the bending ruled line 2 is attached to the plastic sheet 1, the portion in which the convex portion 3 is attached in the ruled line is formed in a direction inclined with respect to the direction in which the ruled line is attached, and therefore, the molecular portion of the portion The density does not become high, and even if the bending force is applied to the thin portion (deep portion), it is not easily torn, and even in the plastic sheet 1 having a small elongation such as biodegradable plastic, The curved ruled line 2 is simply and easily machined. Further, for example, even if cracks, holes, or the like are generated in the bent ruled line 2, or even to the extent that the crack or hole or the like is generated, the bent ruled line 2 is formed deeper, as it is along the bent lattice When the plastic sheet 1 is bent by the thread 2, the convex portion 3 is deformed into a flat state and adhered to each other. Therefore, foreign matter such as dust or moisture is less likely to enter from the curved ruled line 2 in which the crack or the like is generated. The article stored in the packaging container is prevented from being contaminated by foreign matter intrusion, and the quality and product value of the article can be maintained.

Further, the portion of the convex portion 3 arranged in the bottom surface portion 2b of the bending ruled line 2 is thick, and the portions on both sides of the convex portion 3 are thin, and the plastic sheet 1 is applied along the bending ruled line 2. When the bending is performed, the thickness of the two portions formed on both side portions of the bottom surface portion 2b is bent, and the bending property of the plastic sheet 1 is improved, and the bending can be smoothly performed. fold. Further, the convex portions 3 are arranged in the bottom surface portion 2b of the bending ruled line 2, whereby the volume and the wall thickness of the portion where the convex portion 3 is provided are the bending lattice lines formed in the plastic sheet of the conventional example. In the case where the cross section between the convex portion 3 and the convex portion 3 is formed into a curved cross-sectional shape, the plastic sheet 1 having a small elongation ratio such as biodegradable plastic can be used. The bending property is good, and a moderate resilience is ensured. After being assembled into a packaging container, even if the sheet is repeatedly unfolded, it is not easily broken along the bending ruled line 2, and the plastic sheet 1 and the plastic sheet 1 are The durability of the packaging container obtained by the assembly is improved.

As another method of processing the bending ruled line 2, for example, the ruled wire cutter 4 heated to a predetermined temperature may be pressed to the bend of the plastic sheet 1 The folding portion is processed; or the rotating plate cutter (not shown) that is substantially disk-shaped or substantially annular is pressed against the plastic sheet 1, and the rotary ruler is rotated to perform machining.

17 and 18 show another embodiment of the plastic sheet 1 of the present invention. The other embodiment is characterized in that a plurality of groups of the convex portions 3 arranged in a row are arranged at a predetermined interval in the meander line 2 The bottom portion 2b forms the bent ruled line 2.

The use of the ruled wire cutter 4 to attach the bent ruled line 2 to the plastic sheet 1 can produce the same action and effect as the plastic sheet 1 of the above-described form, and the ruled line cutter 4 is as shown in FIG. In response to the arrangement of the convex portions 3, a plurality of sets of the blade portions 5 are arranged at predetermined intervals.

[Example]

In order to confirm the extent to which the convex portions 3 arranged in a line in the bending ruled line 2 are inclined, it is preferable in terms of practicality, and the inclination angle e2 of the blade portion 5 is used as a different ruled line. The knife 4 is used to form the plastic sheet 1 with the bent ruled line shown in Fig. 1, and the bending property and durability of each sheet are evaluated and tested, and assembled into the case of Fig. 2 The appearance (appearance) of the time was evaluated.

(Example 1)

A plastic sheet made of a polylactic acid-based resin having a thickness of 1 mm was used to form a plastic sheet 1 having a bent ruled line.

The ruled wire cutter 4 having the shape shown in Figs. 9 to 15 is used. even if The knives 4 of the ruled knives 4 are formed in a groove shape that gradually becomes shallower from the center portion toward both end portions, and is formed to have a smooth curved surface when viewed from the side. In the semicircular shape, the height a2 of the blade portion 5 is set to be approximately 0.1 mm, the width b2 is set to approximately 0.5 mm, the blade pitch c2 is set to approximately 0.3 mm, and the inclination angle e2 is set to be relative to the lattice. The wire is inclined at an angle of approximately 15 degrees with the direction f attached thereto, thereby forming the blade portion 5.

With respect to the bent ruled line 2 of the formed plastic sheet 1 having the bent ruled line, the inclination angle e1 of the convex portion 3 with respect to the ruled line attachment direction f becomes approximately 15 degrees.

(Example 2)

The same material as in Example 1 and a plastic sheet of the same thickness were used, and the inclination angle e2 of the blade portion 5 of the ruled wire cutter 4 was approximately 40 degrees, except that the ruled wire cutter 4 of the same condition as in Example 1 was used. A plastic sheet 1 having a bent ruled line is formed.

With respect to the bent ruled line 2 of the formed plastic sheet 1 having the bent ruled line, the inclination angle e1 of the convex portion 3 with respect to the ruled line attachment direction f becomes substantially 40 degrees.

(Example 3)

The same material as in Example 1 and a plastic sheet of the same thickness were used, and the inclination angle e2 of the blade portion 5 of the ruled wire cutter 4 was approximately 10 degrees, except that the ruled wire cutter 4 of the same condition as in Example 1 was used. Formed with a curved grid Plastic sheet 1.

In the bent ruled line 2 of the formed plastic sheet 1 having the bent ruled line, the inclination angle e1 of the convex portion 3 with respect to the ruled line attachment direction f becomes substantially 10 degrees.

(Evaluation results)

The plastic sheet 1 formed in each example was evaluated by hand-working along the bending ruled line 2 to make a feeling of bending.

For the plastic sheets 1 of Examples 1 and 3, the repulsive force of the sheets was not felt, and the bending was easily and smoothly performed along each of the bent ruled lines 2. For the plastic sheet 2 of Example 2, the repulsion of the sheet was slightly felt when the bending operation was performed.

Next, regarding the plastic sheet 1 formed in each example, the following operations are repeatedly performed and the unfolding operation of opening 180 degrees from the operation is performed to evaluate the durability of the bending ruled line 2, which means The two face portions are folded along the long curved line 2 which divides the side surface portion 1c and the rear surface portion 1c of the plastic sheet 1.

For the plastic sheet 1 of Example 1 and Example 2, even if the action was repeated dozens of times, the sheet did not crack or crack, but for the plastic sheet 1 of Example 3, the process was repeated. After the action, cracks are generated in the bending ruled line 2.

Further, the plastic sheet 1 formed in each example was bent along each of the bent ruled lines 2, and assembled into the form of the container shown in Fig. 2, and the plastic sheets for the practical examples 1 and 3 were 1 to assemble the resulting container The corners of the container are simple and the appearance is good. On the other hand, it has been confirmed that for the container obtained by assembling the plastic sheet 1 of Example 2, along the corner portion of the container, the column of the moiré-forming convex portion 3 in the bent ruled line 2 is: Thin and white.

As a result of the evaluation, it was confirmed that, in each of the examples, the plastic sheet 1 of Example 1 was excellent in the bending property and durability, and the appearance was excellent when the container was assembled.

The present invention is not limited to the configuration of the illustrated embodiment.

For example, a plurality of the bent ruled lines 2 may be formed in parallel with the bent portion of the plastic sheet 1. Further, the bending ruled line 2 may be attached to, for example, a plastic sheet constituting a pillow type packaging container or a container having a substantially triangular shape or a substantially elliptical shape, and the application is not limited to the form assembled as shown. Plastic sheet in the form of a container. The arrangement of the convex portion 3 and the blade portion 5 is not limited to the arrangement of the illustrated form, and may be used for each pitch as long as it is the predetermined angle and the size included in the predetermined range. The depth, height, width, length, angle, and radius of curvature of the convex portion 3 and the blade portion 5 are changed.

1, 100‧‧‧ plastic sheet

1a‧‧‧Front surface

1b, 2a, 4a‧‧‧ side section

1c‧‧‧Back surface

1d‧‧‧ joint

1e, 1h‧‧‧Folding Department

1f‧‧‧Upper surface

1g‧‧‧Face on the face

2, 101‧‧‧ bending grid

2b, 102‧‧‧ bottom part

3‧‧‧ convex

4‧‧‧ Thread cutter

4b‧‧‧ top face

5‧‧‧Knife Department

6‧‧‧Cutting unit

103‧‧ ‧ uplift

Lines A1-A1, A2-A2, B1-B1, B2-B2, C1-C1, C2-C2, D1-D1, D2-D2‧‧

A1‧‧‧depth

A2‧‧‧height

B1, b2‧‧‧ width

C1‧‧‧ Valley spacing

C2‧‧‧ cutting edge spacing

D1, d2‧‧‧ radius of curvature

E1, e2‧‧‧ angle

F‧‧‧ grid line direction

g‧‧‧Grating knife thickness

h‧‧‧The width of the curved grid

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a developed view showing a plastic sheet with a bent ruled line according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an assembled state of the plastic sheet of Fig. 1;

Fig. 3 is a partially cutaway perspective view showing, in an enlarged manner, a sheet of a bent ruled line formed on the plastic sheet of Fig. 1.

Fig. 4 is an enlarged plan view showing a groove-shaped sheet of the bent ruled line shown in Fig. 3;

Fig. 5 is a cross-sectional view taken along line A1-A1 of Fig. 4;

Fig. 6 is an enlarged cross-sectional view taken along line B1-B1 of Fig. 4;

Fig. 7 is an enlarged cross-sectional view taken along line C1-C1 of Fig. 4;

Fig. 8 is an enlarged cross-sectional view taken along line D1-D1 of Fig. 4;

Fig. 9 is a partially cutaway perspective view of the wire cutter for a plastic sheet to which the bent ruled line of Fig. 3 is attached.

Fig. 10 is a side view showing the blade shape of the ruled line cutter of Fig. 9;

Fig. 11 is a plan view showing the blade shape of the ruled blade of Fig. 9;

Fig. 12 is a cross-sectional view taken along line A2-A2 of Fig. 11;

Fig. 13 is an enlarged cross-sectional view taken along line B2-B2 of Fig. 11;

Fig. 14 is an enlarged cross-sectional view taken along line C2-C2 of Fig. 11;

Figure 15 is an enlarged cross-sectional view taken along line D2-D2 of Figure 11 .

Fig. 16 is a view for explaining a method of manufacturing the ruled knives of Fig. 9;

FIG. 17 is a partially cutaway perspective view showing, in an enlarged manner, a plastic sheet according to another embodiment of the present invention, and an enlarged view of a sheet of a bent ruled line in which a plurality of convex portion groups are arranged at predetermined intervals.

Fig. 18 is an enlarged plan view showing a sheet shape of a groove shape of the bent ruled line shown in Fig. 17;

Fig. 19 is a partially cutaway perspective view of the wire cutter for a plastic sheet to which the bent ruled line of Fig. 17 is attached.

Figure 20 is an enlarged view showing a bend formed on a conventional plastic sheet. An important part of the sheet of the ruled line is cut off from the perspective view.

1‧‧‧Plastic sheet

1a‧‧‧Front surface

1b‧‧‧ side section

1c‧‧‧Back surface

1d‧‧‧ joint

1e, 1h‧‧‧Folding Department

1f‧‧‧Upper surface

1g‧‧‧Face on the face

2‧‧‧Bending grid

Claims (7)

A plastic sheet with a bent ruled line, with a concave curved ruled line attached to the surface, the plastic sheet characterized by: the bent ruled line is: bent and inclined by using a predetermined curvature And a pair of side surface portions facing each other and a bottom surface portion connected to one end side of the side surface portion, wherein the bottom surface portion of the bending ruled line is provided in a curved cross-sectional shape, and The convex portion is arranged in a row, and the convex portion is raised from the surface of the bottom surface portion, and the convex portion is extended in a direction obtained by inclining a predetermined angle in a direction in which the bending rule line is attached. The plastic sheet with a bent ruled line according to claim 1, wherein the convex portion is inclined by about 10 to 90 with respect to an attachment direction of the bending ruled line. The plastic sheet with a bent ruled line according to claim 2, wherein the convex portion is inclined by about 15° with respect to an attachment direction of the bending ruled line. The plastic sheet with a bent ruled line according to any one of claims 1 to 3, wherein: the surface of the bent ruled line is in the curved ruled line The structure of the convex portion is set in a width of 80% or more of the width dimension. A wire cutter for a plastic sheet, which is used when a concave bent ruled line is attached to a bent portion of a plastic sheet, and the plastic sheet is cut by a wire cutter The front end portion of the plastic sheet is characterized by a curved cross-sectional shape, and the ruled surface cutter for the plastic sheet includes: a pair of side portions that are curved and inclined with a predetermined curvature and are opposite to each other And a top surface portion connected to one end side of the side surface portion; a concave blade portion is arranged on the front end portion of the ruled line cutter, and the concave knife portion is in the ruled line cutter At least the top surface portion of the front end portion, and the concave blade portion is configured to extend in a direction obtained by inclining a predetermined angle toward an attachment direction of the bending ruled line. A packaging container, characterized in that the plastic sheet with a bent ruled line according to any one of claims 1 to 4 is bent and bent along the bending ruled line Assembly. A packaging container characterized in that a plastic sheet to which the bent ruled line is attached by using a ruled knives according to the fifth aspect of the invention is carried out along the curved ruled line Bend and assemble.