JPS6223728Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Field of industrial application] The present invention relates to a blank board for forming a case for accommodating a video cassette for television recording. The object of the present invention is to provide a blank plate for performing sack forming by means of the present invention.

[Conventional technology]

Video cassettes for recording television are used for distribution by being inserted and packaged in pre-formed bags for protection, display, decoration, etc.

This sack case for cassette packaging (hereinafter simply referred to as a sack) is made by punching a relatively thick sheet material such as cardboard or plastic sheet into a predetermined shape while forming indented lines for folding, and then forming a blank plate into a sack. It is then folded into a box and glued together at the upper and lower overlapping edges to form a box with one side open.

In order to streamline this process, materials such as thermoplastic sheets such as polypropylene, polyethylene, and polystyrene, or laminated materials with paper or other core sheets having these plastic layers as the surface layer are used as the blank material. It is also widely practiced to use a sheet material with a heat-adhesive surface and heat-press the upper and lower overlapping edges during sack molding, or to heat-bond them using ultrasonic waves or high-frequency current under pressure.

[Problem that the invention attempts to solve]

Conventional video cassette sack packaging uses pre-manufactured sacks as described above, but the capacity of these sacks is larger than that of the blank board, which is disadvantageous for storage, transportation, and handling. However, when inserting a cassette, there are often cases where the cassette does not fit, which causes problems such as an unexpectedly long work time.

In addition, even when forming a sack by thermal bonding, it is necessary to insert a receiving plate into the sack formed by folding the blank plate and bond it under pressure. However, it was difficult to increase the molding efficiency to 30 pieces/min or more.

Therefore, in order to streamline the above-mentioned sack packaging,
A cassette is placed on a sack blank plate, folded and folded, and hot air heated to a high temperature is injected between the facing surfaces of the upper and lower overlapping edges during the sac forming to instantaneously heat only the surface layer. A packaging method that is fusible and immediately press-bonded has been proposed, but
Conventional blank plates have a problem in that hot air enters the inside of the sac, causing problems such as thermal deformation and deterioration of the accommodating cassette.

B. Structure of the invention [Means for solving the problem] The present invention provides a blank board for a rack having a shape that prevents the hot air jet from entering the inside of the rack in the above-mentioned video cassette sack forming and packaging process. It is something.

That is, the present invention is made of a sheet material with a heat-adhesive surface, and has a front panel and a back panel connected to each other through indented lines for folding on the left and right sides of the back panel, and indented lines for folding on the upper and lower sides respectively. An upper flap and a lower flap are arranged in succession, and an upper compressive thin layer portion and a lower compressive thin layer portion having edges inclined toward the back panel side of the upper and lower flaps are respectively formed, and The upper panel and the lower panel are connected to each other via the indented lines for folding, and the side edges of the back panel of the upper and lower panels connected to the back panel are formed by the upper and lower pressure thin layers of the upper and lower flaps during sack molding. The object of the present invention is to provide a video cassette case blank plate for forming and packaging by hot air spray adhesive means, characterized in that it has an inclined edge so as to be overlapped within the area of the video cassette case blank plate.

The sheet material for the blank board used in this project is a conventionally known heat-adhesive sheet material, and the desired indented lines for folding are engraved by ordinary punching. Upper and lower flaps are formed on the top and bottom of the front panel, and upper and lower panels are formed on the top and bottom of the front and back panels, respectively. With an inclined edge of 90 degrees or less with respect to the score line, the flap and the opposing edge of the panel are overlapped during the folding process, and the edge areas of the overlapped flap are biased and thinned. There is.

The above-mentioned compressed thin layer part of the flap is formed under pressure at the same time as the sheet material is punched or formed, or by hot pressing after punching, and the thickness of the thin layer part is about 1/3 or less of the sheet material. It is desirable to do so.

[Effect]

The case blank board of this project has the above structure, so place the video cassette on the back panel of the blank board, and fold the upper and lower panels of the back panel, back panel, upper and lower flaps, and front panel in order. By doing so, the upper and lower panels and the upper and lower flaps fit into contact with the upper and lower sides of the video cassette, and the upper and lower pressure thin layer parts of the upper and lower flaps overlap and closely contact the edges of the upper and lower panels, respectively, and the cassette is closed. The upper and lower sides of the front panel are covered without being exposed, and by slightly folding the upper and lower panels of the front panel, the above-mentioned folded covering state is maintained, so that the upper and lower panels of the slightly folded front panel The hot air injected into the wedge-shaped space where the upper and lower panels of the back panel that cover the upper and lower sides of the cassette, and the upper and lower flaps face each other can successfully thermally bond the upper and lower overlapping edges of the sac without entering the cassette surface. can.

If the thickness of the compressed thin layer portion is set to 1/3 or less of the thickness of the sheet material, the unevenness occurring on the inner and outer surfaces of the upper and lower overlapping edges of the sack case will be slight and will not pose a practical problem.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

Fig. 1 is a plan view of the blank board for sacking of the present invention, and the thickness of the compressed foamed polypropylene board is shown in Fig. 1.
It is made by die-cutting and forming a sheet of 0.5 to 1 mm. 2 is a back panel with dimensions that match the surface shape of the cassette to be accommodated, 3 is a back panel with a width that matches the thickness of the cassette, and 1 is the thickness of the sheet. 4 and 5 are rectangular upper and lower panels that are connected to the upper and lower edges of the front panel 1 and have a slightly wider upper and lower width, taking into account the thickness of the cassette and the sheet thickness. The upper and lower panels 6 and 7 connected to the back panel 2 have a top and bottom width that matches the thickness of the cassette, and have inclined edges 41 and 51 on the side edges of the back panel 3, respectively. An upper flap 12 and a lower flap 13 are connected to the upper and lower ends of the panel 3, and the upper and lower flaps 12 and 13 have edge edges 61 and 71 that are inclined toward the upper and lower panels 6 and 7, respectively.
An upper barometric thin layer section 22 and a lower barometric thin layer section 2 having
3 is formed.

These front panel 1, back panel 3, back panel 2
border between the back panel 3 and the upper and lower flaps 12, 1
3, the boundary between the front panel 1 and the upper and lower panels 4 and 5, and the boundary between the back panel 2 and the upper and lower panels 6 and 7 are all marked with intaglio lines 16, 17, 1 for folding.
8, 19, 20, 21, 30, and 31 are engraved respectively.

Reference numerals 90 and 91 are notches provided at the outer edges of the front and back panels 1 and 2 to facilitate taking out the cassette from the sac.

FIG. 2 shows that the upper and lower panels 6, 7, the upper and lower flaps 12, 13, and the upper and lower flattened layer parts 22, 23 are folded in and abut against the outer surface of the inner cassette C, and the front panel 1
It is a side view of the principal part of the overlapping part on the lower flap 7 side at the time when it is slightly folded in, and the reference numerals of each part on the upper side are indicated with parentheses. Upper and lower panels 6, 7
The edges 41, 51 of the back panel side edges of the upper and lower flaps 22,
23, and therefore the upper and lower panels 6, 7 and the upper and lower flaps 12, 1
3 and the upper and lower pressure-flattened layer parts 22 and 23 cover both the upper and lower sides of the cassette C shown by the dashed line without exposing them.

The formation of the above-mentioned compressed thin layer parts 22 and 23 is carried out by forming a boundary line 32 on the upper panel 6 side of the upper flap 12 when punching a blank plate, as shown in FIG. 3A, taking the upper flap 12 as an example. By providing a pressure biased portion 22' with a small area with the virtual line 32' as a boundary, and further applying heat and pressure to the pressure biased portion 22', a boundary plug 32 is formed as shown in A, and a desired shape is formed. The purpose is to obtain a large-area pressure-biased thin layer portion 22. In order to give the pressure-biased thin layer portion 22 the desired shape and thickness, the shape of the punching of the pressure-biased portion 22' and the pressure-biased thin layer portion 22 are changed. It is necessary to appropriately adjust and select the heating and pressurizing conditions for this purpose, and it goes without saying that the compressed thin layer portion 23 can be formed in the same manner on the lower flap 13 side.

The blank plate having the above structure is used to package the video cassette C by, for example, the following automatic folding process.

That is, when the cassette C is placed on the back panel 2 of the blank plate placed on the belt conveyor V, the upper and lower panels 6 and 7 stand upright, then the back panel 3 stands upright, and then the upper and lower flaps 12 , 13 are sequentially pressed together by pressing plates, and the upper and lower pressure flattened layer parts 22 and 23 are folded and overlapped on the upper and lower panels 6 and 7, respectively, and together with these, the upright front panel 1 is folded at right angles to form a cassette. At the same time, the upper and lower panels 4 and 5 of the front panel 1 are slightly pressed and bent into an inclined state, resulting in the state shown in the perspective view of FIG. 4, and the pressure F is maintained from the top surface. As shown in FIG. 5, the lower panels 5, 7 and the upper panels 4, 4,
6, hot air at about 300°C is pumped from a number of nozzles H arranged on both sides of the tip of the wedge-shaped nozzle N arranged on both sides of the belt conveyor V over the entire surface of the upper and lower wedge-shaped space W formed by the belt conveyor V. Spray for 0.4 seconds to heat the opposing surfaces of both upper and lower panels 5, 7 and 4, 6, melt those surface layers, and immediately place the upper and lower panels 4, 5 of the front panel 1, which is in an inclined state, facing each other. The upper and lower panels 6 and 7 are crimped and fixed by welding.

During the hot air injection, the back panel 2
Upper and lower panels 6, 7, upper and lower flaps 12, 1
3 and the upper and lower thin layer portions 22 and 23 elastically adhere to each other on both upper and lower side surfaces of the cassette so as to cover each other with no exposed gap, and the above-mentioned thin layer portions 22 and 23 are covered by the jet air pressure. 23 is crimped to the upper and lower panels 6 and 9, and further the upper and lower panels 6,
7 edge edges 40, 50 and upper and lower flaps 12,
Since the edges 60, 70 of the back panel 2 side of the panel 13 are in close contact with the folding indented lines 20, 21 of the front panel 1, hot air does not intrude into the cassette C surface containing the panel sheet. Since the temperature increase is limited to only the surface layer of the cassette C, damage to the cassette C due to hot air is completely prevented.

In the above case, the temperature, injection pressure, and injection amount of hot air can of course be changed as appropriate depending on the type, shape, etc. of the blank board material, and this method allows automatic sac forming of 100 cassettes or more per minute. It can be packaged.

The inventor of the present invention has already proposed various blank plates for cassette storage sack packaging for the same purpose, but in the conventional folding sack forming process, the folded edges of the upper and lower panels of the back panel and the folded edges of the back panel are often However, according to the present invention, the side edges 41, 51 of the upper and lower panels 6, 7 of the back panel 2 are aligned with the upper and lower flaps 12, 13 of the back panel 3. The compressed thin layer portions 22 and 23 that are formed only can be folded over each other without colliding with each other, and the sac molding and packaging process can be carried out reliably.

Figure 6 shows the main parts of the folded corners of a conventionally used video cassette blank board. The lower panel 8 of the back panel 82 has a flap 86.
7 has a notch (dotted line) that fits the trapezoid of the lower flap 86, and when folded into a box shape, the lower panel 87 and the lower flap 86 are displayed flush with no overlapping parts. It is made to be glued to the lower panel 85 of the panel 81, and the upper corner part is also made in the same way.Although it is possible to perform sack molding in advance, it is not suitable for the sack molded packaging for storing the cassette which is the intended use of the present invention. Hot air jet bonding is completely unusable because it causes thermal damage to the cassette.

C. Effects of the invention As established above, the blank packaging blank board of the present invention can safely and reliably form cassettes into cassette packaging using hot air spray adhesive means, and can improve the packaging efficiency. There is a lot to contribute.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention: Fig. 1 is a plan view, Fig. 2 is a side view of the main part showing the polymerization state after folding the flap, and Fig. 3A is a view before forming the compressed thin layer part. Fig. 4 is a perspective view of the main part in the hot air adhesion step of the cassette sack packaging process; Fig. 5 is the main part in the hot air injection process. FIG. 6 is a plan view of the main parts of a conventional video cassette blank board. 1...Front panel, 2...Back panel, 3...Back panel, 4, 6...Top panel, 5, 7...Bottom panel, 12...Top flap, 13...Bottom flap, 22...Top Pressure thin layer portion, 23...Lower pressure thin layer portion, 16, 17, 18, 19, 20, 2
1, 30, 31... Intaglio line for folding, 40...4
1, 50, 51, 60, 61, 70, 71... Edge, 32, 33... Boundary line, C... Cassette, N
...Wedge-shaped nozzle, W...Wedge-shaped space.

Claims (1)

[Scope of utility model registration request] Made of a sheet material with a heat-adhesive surface, there are indented folding lines 1 on the left and right sides of the back panel 3, respectively.
The front panel 1 and the back panel 2 are arranged in series through 6 and 17, and there are folding intaglio lines 18 and 19 on the top and bottom, respectively.
The upper flap 12 and the lower flap 13 are connected to each other via the upper flap 12 and the lower flap 13.
2. Form a lower pressure-flattened layer portion 23, respectively, and insert upper panels 4, 6, lower panel 5, 7 in a row, back panel 2
The back panel 3 side ends of the upper and lower panels 6 and 7 connected to the upper and lower flats 12 and 13 are
A method for forming and packaging by hot air spray adhesive means, characterized in that it has inclined edges 41, 51 so as to be overlapped in the regions of the upper and lower compressed thin layer parts 22, 23. Video cassette case blank board.