JP3082721U - Book case made of transparent plastic sheet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When assembling a transparent plastic sheet punched into a predetermined shape using an automatic book case processing machine,
There is no need to add a folding habit to the transparent plastic sheet in advance, and it can be assembled quickly using an automatic book case processing machine as it is, and the folded case pieces can be quickly and neatly bonded without leaving any traces. Provide a transparent plastic sheet book case. SOLUTION: A folding line 1A, 1B, 2A, 2 for ruled line or perforated folding is formed on a plastic sheet PK constituting a transparent plastic sheet book case PT.
B, 3A, 3B has a bending strength required for bending the sheet PK at a right angle of 60 gf per 1 cm of fold line length.
The case pieces 4, 5, 6 and 7 forming the top surface are adhered to each other with transparent hot melt adhesives SA and SB.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, a case containing various recording media such as a compact disc (CD) and a digital video disc (DVD) can be stored as it is, or a case containing the recording medium and a booklet can be put together. The present invention relates to a book case made of a transparent plastic sheet that is devised so that it can be stored.

[0002]

[Prior art]

 Generally, various cases containing recording media such as CDs and DVDs in which music, video, data, etc. are recorded, and bookcases accommodating such various cases and booklets are generally printed. It is made of paperboard, but recently, in order to show its contents and enhance its commercial value, it uses transparent plastic sheets such as polypropylene, polyethylene terephthalate (PET), and polyvinyl chloride as its material. Bookcases made of transparent plastic sheets printed on paper are widely used.

In order to manufacture the book case made of the above-mentioned transparent plastic sheet, first, a transparent plastic sheet is punched into a predetermined shape, and at the same time, a folding ruled line (folding line) is inserted using a ruled line blade. Next, after the transparent plastic sheet is bent to some extent in advance along the ruled lines, each part is folded by an automatic machine, and the top and bottom sides are spot-sealed with an ultrasonic welder in a point-like manner, thereby assembling the parts. It consists of

FIG. 5 shows an example of a book case PT made of a transparent plastic sheet assembled by the above-described conventional method and a case 10 containing a recording medium 12 such as a CD or DVD stored in the book case PT. In the drawing, a book-type storage case 10 having a tray 11 into which a recording medium 12 is fitted is shown, but instead, the entire case is formed in a box shape with a flat lid. In some cases, a plastic case is used and stored in the book case PT.

In FIG. 5, P 1, P 2, P 3, and P 4 are upper and lower case pieces constituting a top surface portion of a transparent plastic sheet book case RT, and the book case RT is overlapped with the upper and lower parts. Each of the case pieces P1, P2 and P3, P4 is assembled by forming spot seals RA..., RB... With an ultrasonic welder. FIG. 6 is an enlarged sectional view of the spot seals RA and RB.

[0006]

[Problems to be solved by the invention]

 However, in the conventional book case PT made of a transparent plastic sheet configured as shown in FIGS. 5 and 6, unless the transparent plastic sheet is previously bent, an automatic book case bending / ultrasonic sealing machine is used. Therefore, there was a problem that assembly processing could not be performed automatically.

That is, the sheet thickness of a polypropylene sheet conventionally used as a transparent plastic sheet is 0.25 mm to 0.30 mm, and the depth of a folding ruled line to be cut into a sheet surface by a ruler blade at the same time as punching. Is generally 0.10 mm or less. As a result, the remaining thickness of the ruled line portion formed on the sheet becomes 0.15 mm or more, and the force required to apply a load to the sheet and bend the ruled line portion at a right angle is 60 g · cm per ruled line length. Force (gf) or more. Since the force required to apply the transparent plastic sheet to the automatic book case bending / ultrasonic sealing machine, that is, the bending strength is not more than (60 gf / per 1 cm of the folding line length), the above-mentioned automatic folding is performed at the above-mentioned ruled line depth. Since the force applied to the book case processing machine would surely be exceeded, it was necessary to make the transparent plastic sheet bendable in advance, and there was a problem that the assembly work was inevitably complicated.

As shown in FIGS. 5 and 6, in order to assemble the transparent plastic sheet book case PT with the spot seals RA... RB using an ultrasonic welder, the transparent plastic sheet is melted. Need to glue. However, this melting and bonding requires about 5 seconds for each product, so that ultrasonic sealing can be performed only at most 12 times per minute, which further reduces productivity. As shown in FIG. 5, since the traces of the spot seals RA and RB remain on the top surface, there is a problem that the appearance is poor and the commercial value is reduced.

Therefore, a technical problem of the present invention is that when a transparent plastic sheet punched into a predetermined shape is assembled by an automatic book case processing machine, it is not necessary to add a folding habit to the transparent plastic sheet in advance, and the automatic book case processing is not performed. An object of the present invention is to provide a book case made of a transparent plastic sheet that can be quickly assembled on a machine and that is designed so that bent case pieces can be quickly and neatly adhered without leaving any traces.

[0010]

[Means for Solving the Problems]

 The measures taken in the present invention to solve the above technical problems are as follows.

(1) A transparent plastic sheet punched into a predetermined shape is folded along a ruled line or perforated folding line inserted at the same time as the punching, so that a compact disk (CD) or a digital video disk ( A transparent plastic sheet bookcase configured to store a case containing various recording media such as DVD), or to store this case and a booklet together. The ruled line or perforated fold line to be inserted into the sheet is configured so that the force required to fold the transparent plastic sheet at a right angle, that is, the fold strength is 60 gf or less per 1 cm of the fold line length. (2) Using an automatic bookcase bending and gluing machine, each case piece of the transparent plastic sheet that constitutes the top and bottom of the bookcase is folded along the folding line, and then stacked up and down to make it transparent. It should be configured so that bookcase processing can be done automatically by bonding with hot melt adhesive.

According to the means of claim 1 described in the above (1), the thickness ranges from 0.25 mm to 0.2 mm. For a 30 mm transparent plastic sheet, a force for bending a ruled line or perforation to apply a load to a fold line portion of the plastic sheet at a right angle, that is, a bending strength of (60 gf / cm of fold line length 1 cm) ) Since it is formed as shown below, there is no need to pre-fold the transparent plastic sheet, and the book case can be put on the automatic bookcase ultrasonic sealing machine or automatic bookcase gluing machine for a short time. It enables automatic and smooth assembly at home.

According to the second aspect of the present invention, as described above, the force for bending the fold line portion of the plastic sheet at a right angle, that is, the bending strength is (60 gf / fold line). Since the length of the bookcase is less than 1cm), the bonding of the upper and lower case pieces that compose the top surface of the bookcase is all automatically performed using an integrated automatic folding machine and automatic adhesive sealing machine. Since it can be bonded, it is possible to significantly improve productivity by bonding at a high speed of 1 piece per second (60 pieces per minute) as in the case of punching and bonding printed paperboard. enable. In addition, since a transparent hot melt adhesive is used as the adhesive, the adhesive part (seal part) passes through a transparent plastic sheet such as an opaque yellow hot melt adhesive or a spot seal using an ultrasonic welder. Since it is not directly exposed to the outside, it is possible to provide bookcases with good appearance and high commercial value.

[0014]

[Embodiment of the invention]

 Hereinafter, an embodiment of a book case made of a transparent plastic sheet according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a development view showing the entire transparent plastic sheet PK constituting the book case of the present invention. The sheet PK is formed by punching a transparent plastic sheet material such as polypropylene, polyethylene terephthalate (PET), or polyvinyl chloride with a press, and a fold line for bending is formed at the time of the punching. It consists of

In the developed view of FIG. 1, reference numerals 1 and 2 denote a front plate and a rear plate constituting a book case PT as shown in FIG. 2, and 3 denotes left and right sides thereof via folding lines 3A and 3B. The back plates 4 and 5 and 6 and 7 formed by connecting the front plate 1 and the back plate 2 are provided with folding lines 1A, 1B and 2A and 2B above and below (top and bottom) of the front plate 1 and the back plate 2, respectively. 8 and 9 are triangular pieces continuously connected via folding lines 8A and 9A above and below (top and bottom) of the back plate 3, and 6X and 7X are the back plates. 2 shows the inclined inner end faces of the case pieces 6 and 7 connected to each other. In the drawing, ruled lines are shown as folding lines 1A to 9A, but a perforation (not shown) may be inserted in the transparent plastic sheet PK instead, and the selection is arbitrary.

Each of the fold lines 1A, 1B, 2A, 2B, 3A, 3B, 8A, 9A formed on the sheet surface of the transparent plastic sheet PK having a thickness of 0.25 mm to 0.30 mm together with the punching. As shown in FIG. 4, each of the transparent plastic sheets PK has a depth of 0.15 mm or less, as shown in FIG. The transparent plastic sheet PK is applied with a load to bend the above-mentioned fold lines 1A to 9A at right angles. The required force, that is, the bending strength is (60 gf / fold line length 1 cm) or less, preferably (45 gf / fold line length 1 cm) or less, and the automatic book case bending / pasting is performed. It enables automatic bookcase processing by a pasting machine.

In the development of the transparent plastic sheet PK shown in FIG. 1, an example of the actual dimensions (mm) will be described. The vertical width of the surface plate 1 is 25.5 and the horizontal width is 142.5. Height of face plate 2 = 126.0, width = 142.5 Height of back plate 3 = 125.5, width = 10.5 Length of each case piece 4, 5, 6, 7 = 10.5 It is. Therefore, in the transparent plastic sheet PK having the above dimensions, for example, the bending strength of the fold lines 1B and 2B is (fold line length 14.25 × 45 = 641.25 gf) or less, and the automatic bookcase processing is performed. This is a condition for smooth application to the machine. Although not shown, instead of the folding lines 1A to 9A of the respective ruled lines, for example, perforations having various shapes such as a nesting (nesting) shape and a wavy shape, double ruled lines, and the like are transparent. As described above, by applying to the plastic sheet PK, each fold line portion may be in a state where the fold strength is easy to fold (60 gf / fold line length 1 cm) or less.

In order to assemble the book case PT shown in FIG. 2 using the transparent plastic sheet PK configured as described above, first, the front plate 1 and the back plate 2 are joined to the left and right fold lines 3 A and 3 B of the back plate 3. The upper and lower case pieces 4, 5 and 6, 7 and the upper and lower triangular pieces 8, 9 constituting the top and bottom are folded along the folding lines 1A, 1B and 2A, respectively. , 2B, 8A, and 9A, and bend inward. Finally, the case pieces 4, 6, 5, and 7 that overlap vertically are bonded with transparent hot melt adhesives SA and SB as shown in FIG. As a result, the entirety of the book case PT having the insertion opening PN opened on one side can be assembled into a transparent book case PT. The book case made of a transparent plastic sheet according to the present invention has the above-described respective structures. All machining operations using machines Automatically.

The case 10 containing the recording medium 12 inserted into the book case PT shown in FIG. 2 is the same as that described in the conventional example shown in FIG. A storage case 10 of a book type having a tray 11 for storing a recording medium 12 such as a DVD or a DVD is shown, but this is an example of an embodiment, and instead, a plastic with an opening / closing lid storing the recording medium 12 is used. As mentioned above, cases and booklets may be stored.

FIG. 3 is an enlarged front view of the transparent plastic sheet bookcase PT according to the present invention assembled as shown in FIG. This explains the state of adhesion by SA and SB.

When the book case is made of printed paperboard (opaque), when the printed paperboard is applied to an automatic bookcase processing machine (automatic folding / hot melt bonding), the photoelectric board switch catches the printed paperboard. The machine works smoothly. However, when the transparent plastic sheet PK is used as a material as in the present invention, not only when printing is not performed, but also when a printed product is printed by one color, the color density is too low, and the photocell is not printed. May not sense.

Therefore, in implementing the present invention, a transparent plastic sheet book according to the present invention is provided by using a reflection-sensitive photoelectric tube, which is more accurate than a conventional paper photoelectric tube, and is not a transmission type. This enables automatic production of the case PT.

[0023]

[Effect of the invention]

 As described above, according to the book case made of the transparent plastic sheet according to the present invention, a book case for storing a booklet or a plastic case containing a recording medium such as a CD or a DVD is used as an automatic book case processing machine. It enables smooth and automatic processing in a short time using an automatic machine of this type. The production cost is low, and the appearance of the bonded part is good by using a transparent hot melt adhesive. It has the practicality of providing a transparent plastic sheet book case with high commercial value.

[Brief description of the drawings]

FIG. 1 is a development view of a transparent plastic sheet constituting a book case made of a transparent plastic sheet according to the present invention.

FIG. 2 is a perspective view showing an example of an assembled book case according to the present invention and a case for a CD or a DVD stored in the book case;

FIG. 3 is an enlarged sectional front view of the book case according to the present invention, with a part thereof omitted;

FIG. 4 is an enlarged sectional view showing a ruled line portion to be put in a transparent plastic sheet.

FIG. 5 is a perspective view illustrating the configuration of a conventional book case.

FIG. 6 is an enlarged sectional view of a spot seal portion by a conventional ultrasonic welder.

[Explanation of symbols]

PT Book case made of transparent plastic sheet PN insertion slot PK Transparent plastic sheet 1 Front plate 2 Back plate 3 Back plate 4, 5, 6, 7 Case pieces 1A, 1B, 2A, 2B, 3A, 3B that constitute the top ground Folding line 10 Recording media storage case 12 Recording media such as CD and DVD SA, SB Transparent hot melt adhesive

Claims (2)

[Utility model registration claims] 1. A compact plastic disc (CD) or a digital video disc (DVD) is formed by folding a transparent plastic sheet punched into a predetermined shape along a ruled line or perforated fold line inserted at the same time as punching. A book case made of a transparent plastic sheet configured to store a case containing the various recording media described above, or to be able to store the case and a booklet together. A transparent plastic, characterized in that a ruled or perforated fold line is formed so that the force required to fold the transparent plastic sheet at a right angle, that is, the fold strength is 60 gf or less per 1 cm of fold line length. Book case made of sheet. 2. Using an automatic bookcase folding / pasting machine, each case piece of a transparent plastic sheet constituting a top surface portion of a bookcase is folded along the folding line, and then stacked up and down. 2. A book case made of a transparent plastic sheet according to claim 1, wherein the book case can be automatically processed by bonding with a transparent hot melt adhesive.