JPS6129646Y2 - - Google Patents

Description

[Detailed description of the invention] Video tape cassettes for recording television are housed and packaged in a sack case for protection, display, decoration, etc. The case for this cassette packaging (hereinafter simply referred to as a case) is usually made of cardboard,
A relatively thick sheet material such as a plastic sheet is folded and punched into a predetermined shape while forming indented lines.
A blank plate is folded into a sac shape, and the upper and lower overlapping edges are glued together to form a product.The cassette is inserted into the sac and packaged for distribution.

According to the above-mentioned sack packaging process, the shaped sack has a larger volume than the blank board, making it easier to store and store.
Not only is this disadvantageous for transportation, but it also requires the process of inserting and storing the cassette in a sack, and in the case of a case that does not fit the cassette, there are problems such as an unexpectedly long work time.

The present invention relates to an improvement of a sack blank plate used for carrying out sack forming while containing a cassette, in order to improve the efficiency of sack packaging of cassettes.

Normally, when performing sack molding using thermoplastic sheets such as polypropylene, polyethylene, and polystyrene, or laminated materials with paper or other core sheets that have these plastic layers as the surface layer, the upper and lower overlapping edges are heated and pressurized. Alternatively, ultrasonic or high frequency bonding is performed under pressure, but in this case it is necessary to insert a receiving plate inside the sac, and the sac cannot be formed with the cassette housed. The molding process had a low molding efficiency of about 30 pieces per minute at most due to the insertion and removal of the receiving plate.

Therefore, in order to perform block forming with high efficiency while housed in the above-mentioned cassette, hot air heated to a high temperature is injected between the facing surfaces of the upper and lower overlapping edges during block forming to momentarily heat only the surface layer. A method of making the cassette adhesive and crimping it immediately has been proposed, but there is a problem in that if this hot air enters the inside of the sac, it will cause damage such as thermal deformation and deterioration of the accommodating cassette.
The present invention provides a blank plate for sacks having a shape that prevents the jetted hot air from penetrating into the interior of the sack during the above-mentioned sack packaging process.

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 plate for sacking according to the present invention, and the thickness of the compressed foamed polypropylene plate is omitted.
It is made by die-cutting and forming a sheet of 0.5 to 1 mm. 1 is a front 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 2 is the thickness of the sheet. 4 and 5 are an upper panel and a lower panel that are connected to the upper and lower edges of the front panel 1 and have a vertical width that matches the thickness of the cassette, and the back panel of each At the end on the third side, an upper flattened thin layer part 14 and a lower flattened thin layer part 15 having inclined edges are arranged in succession.

Further, a rectangular upper panel 6 and a rectangular lower panel 7 are arranged on the upper and lower edges of the back panel 2, and the upper and lower widths of these panels 6 and 7 are equal to the upper and lower panels 4 and 5 of the front panel 1.
By taking into account the sheet thickness, the width is even wider.

Furthermore, an upper flap 12 and a lower flap 13 having end edges 61 and 71 inclined toward the piezolayer portions 14 and 15 are connected to the upper and lower edges of the back panel 3.

These front panel 1, back panel 3, back panel 2
border, back panel 3 and upper and lower flaps 12, 1
3, the boundaries between the front panel 1 and the upper and lower panels 4 and 5, and the boundaries between the back panel and the upper and lower panels 6 and 7 are all marked with intaglio lines 22, 23, 1 for folding.
0, 11, 20, 21, 30, 31 are engraved, respectively.

The upper and lower flaps 12 and 13 have angles formed by the folding indented lines 10 and 11 and the front panel side edges 61 and 71 of the upper and lower flaps 12 and 13 in order to facilitate folding when forming the sack. is about 45 degrees, and the height of the upper and lower flaps 12 and 13 is made smaller than the left and right width l of the back panel 3, but the vertical inclination angle and the height of the flaps can be changed arbitrarily for design purposes. be able to.

Reference numerals 9 and 19 indicate notches provided at the outer edges of the front and back panels 1 and 2, which facilitate the removal of the cassette from the sack.

Figure 2 shows the state at which the upper and lower panels 4, 5, the upper and lower compressive thin layer parts 14, 15, and the upper and lower flaps 12, 13 are folded in and in contact with the cassette C surface, and the back panel 2 is slightly folded in. In the side view of the main parts of the overlapping part on the lower flap 5 side, the symbols of each part on the upper side are shown in parentheses. The upper and lower pressure-flattened layer parts 14 and 15, which are connected to the upper and lower panels 4 and 5 through the boundary lines 24 and 25, are located within the regions of the upper and lower flaps 12 and 13, as shown by broken lines. The shapes to be overlapped are, for example, obtuse triangular shapes with cross hatching as shown in FIG. 3A. The formation of the above-mentioned compressed thin layer parts 14 and 15 is carried out by drawing a boundary line 24 at the back panel side edge of the upper panel 4 during punching of a blank board, as shown in FIG. 3A, taking the upper panel 4 as an example. Pressurized uneven part 1 with a small area
4' and further heat and pressurize the pressure biased portion 14' to obtain a pressure biased thin layer portion 14 having a desired shape and a large area, as shown in A. In order to give the portion 14 a desired shape and thickness, it is necessary to appropriately adjust and select the shape of the punched portion 14' and the conditions for heating and pressurizing the pressure portion 14'. Of course, the compressed thin layer portion 15 is formed on the 5th side in the same manner.

The blank board having the above structure is folded into a videotape cassette C by, for example, the following automatic folding process.
will be packed in bulk.

That is, when the cassette C is placed on the front panel 1 of the blank board placed on the belt conveyor V, the upper and lower panels 4 and 5 stand upright, and then the back panel 3
is erected, and the upper and lower flaps 12 and 13 are sequentially pressed and folded onto the upper and lower compressed thin layer portions 14 and 15, respectively, by pressing plates, and together with this, the upright back panel 2 is folded at right angles to form the cassette C. At the same time, the upper and lower panels 6 and 7 of the back panel 2 are pressed and bent in an inclined manner, resulting in the state shown in the perspective view of FIG. 4, and the pressure P is maintained from the top surface, and at this point As shown in the figure, the tips of wedge-shaped nozzles N are arranged on both sides of the belt conveyor V over the entire left and right wedge-shaped spaces W formed by the lower panels 5 and 7 of the front and back panels 1 and 2 and the upper panels 4 and 6. Approximately from the numerous fumaroles H arranged on both sides
300°C hot air is injected for 0.3 to 0.4 seconds to heat the opposing surfaces of both upper and lower panels 5, 7 and 4, 6 to melt their surface layers, and immediately
Upper and lower panels 6, 7 of the back panel 2 in an inclined state
The cassette sac packaging is completed by pressing the wafers onto the opposing upper and lower panels 4 and 5 and melting and fixing them.

During the hot air injection, the front panel 1
The upper and lower panels 4, 5, the upper and lower pressure-thin layer parts 14,
15 and the upper and lower flaps 12 and 13 elastically adhere to each other on both upper and lower sides of the cassette so that there are no exposed gaps. , 13 on the back panel side are in close contact with the folding indented lines 30, 31 of the back panel 2, so that hot air does not penetrate into the cassette C surface accommodated, and the panel sheet is heated by hot air injection. 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.

Moreover, since the upper and lower pressure-thin layer parts 14 and 15 are pressed by the folding of the upper and lower flaps 12 and 13 and are bent slightly toward the inside of the sac by the thickness of the sheet, the upper and lower panels 4 and 5 and the upper and lower flaps 12 and 13 The surfaces are flush with each other with almost no step between the boundary lines 24 and 25, and the melting and crimping after hot air injection is performed reliably and evenly. The resulting unevenness hardly occurs, resulting in a favorable appearance, and the inner surface of the overlapping portion of the compressed thin layer portions 14 and 15 is
Since the cassette C is held elastically pressed against both sides of the cassette C, it is possible to prevent the cassette C from accidentally falling off.

In the above case, the hot air temperature, injection pressure, and injection amount are determined by the type, shape, and shape of the blank board material.
It goes without saying that the method may be modified as appropriate, and with this means it is possible to automatically pack more than 100 cassettes per minute.

Figure 6 shows the main parts of the folded corners of a conventionally used video cassette blank board. The lower panel 35 of the front panel 41 has a flap 32.
has a notch (dotted line) that fits the trapezoid of the lower flap 32, and when folded into a box shape, the lower panel 3
5 and the lower flap 32 are connected to the lower panel 45 of the back panel 42 so that they are flush with each other, and the upper corner portions are also made in the same way. However, hot air spray adhesion cannot be used at all in the case of sack packaging molding in a cassette, which is the intended use of the present invention, because it causes thermal damage to the cassette.

As explained above, the blank packaging blank board of the present invention can safely and reliably pack cassettes using hot air spray adhesive means, and greatly contributes to improving the packaging efficiency. be.

[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 hot air adhesion step in the cassette sack packaging process; Fig. 5 is a plan view of the main part of the main part after forming the compressed thin layer; The front view and FIG. 6 are plan views of essential parts of a conventional blank board for video tape cassettes. 1...Front panel, 2...Back panel, 3...Back panel, 4, 6...Top panel, 5, 7...Bottom panel, 12...Top flap, 13...Bottom flap, 14...Top Pressure thin layer portion, 15...Lower pressure thin layer portion, 10, 11, 20, 21, 22, 2
3, 30, 31... Intaglio line for folding, 40, 50,
60, 61, 70, 71... edge, 24, 25...
...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 22 on the left and right sides of the back panel 3, respectively.
The front panel 1 and the back panel 2 are connected via 23,
An upper flap 12 and a lower flap 13 having edges 61 and 71 that are inclined toward the front panel 1 side through folding indented lines 10 and 11 are connected to each other at the top and bottom of the front and back panels 1 and 2, respectively. The upper panels 4, 6 and the lower panels 5, 7 are connected to each other via the folding indented lines 20, 30, 21, 31, respectively, and the ends of the upper and lower panels 4, 5 on the back panel 3 side are An upper flattened thin layer part 14 and a lower flattened thin layer part 15 each having an inclined edge are arranged in series, and the upper and lower flattened thin layer parts 14 and 15 form the corresponding upper and lower flaps during sack molding. 1. A blank board for sack packaging of videotape cassettes for molding by hot air spray adhesive means, characterized in that the blanks are located within the areas 12 and 13 and overlapped.