JPS607131Y2 - Blister forming drum - Google Patents

Description

[Detailed description of the invention] The present invention relates to a blister forming drum that forms blisters using suction from a heated thermoplastic sheet, and in particular, the suction openings of the concave pockets on the circumferential surface are shaped like slits to form blisters without protrusions. It is an object of the present invention to provide a blister forming drum that can be formed.

First, a blister pack machine to which a blister forming drum according to the present invention is applied and a packaged product manufactured using the same will be explained.

The packaging product 1 is generally used as a small package for pharmaceutical tablets or capsules, and as shown in FIGS. It has a structure in which a tablet is placed on top, an aluminum foil 4 is thermally bonded to the bottom surface, and perforations 5 for separating and cutting are provided in a grid pattern.

This packaged product 1 is manufactured by a Pristapack machine 6 whose schematic configuration is shown in FIG.

A thermoplastic vinyl chloride sheet 7 is unrolled from a reel 8 and first vertically perforated in the longitudinal direction between a vertically perforated roll 9 and a roll 10 that abuts it.
Subsequently, a transverse perforation roll 11 makes transverse perforations perpendicular to the longitudinal direction.

Subsequently, the sheet 7 is attached to the circumferential surface of a blister forming drum 12 which is formed by arranging a plurality of concave blisters on a curved surface and rotates at a speed corresponding to the traveling speed of the sheet 7. It is heated by a heater 13 provided opposite to the peripheral surface.

The sheet 7 is sufficiently heated by the heater 13 and the drum 12
A suction operation is performed at position A, which is further away, and the sheet 7 is suctioned into the concave pocket to form a blister under vacuum.

Next, the tablets or capsules are automatically supplied one by one from the hopper 14 to the formed blister by the supply roller 15, and the sheet 7 further travels to reach between the pair of seal rollers 16 and 17.

On the other hand, the aluminum foil 18 is checked for printing pitch by a phototube 19, and is pulled out from the reel 21 while the feed amount is adjusted by the operation of the braking device 20, and is formed into a blister-formed sheet between a pair of seal rollers 16 and 17. 7
is thermally bonded to.

The formed blister is filled with tablets, etc., and aluminum foil 18
The sheet that has been thermally bonded to the back side is heated using tension roller 2.
A constant tension is applied by feed roller 23.
24, and is punched out by a punching and trimming mechanism 25, and then transferred to the conveyor 2 as a packaged product shown in FIG.
It is carried out by 6.

The punched waste is wound up and organized by a take-up reel 27.

), the concave pocket 3 of the conventional blister forming drum
0, as shown in FIGS. 3A and 3B, has a configuration in which a thin air suction hole 31at31b with a circular cross section is opened inside.

The openings 32a and 32b of the air suction holes 31a and 31b are located at the periphery of the bottom surface 30a of the concave pocket 30.

During suction, part of the vinyl chloride sheet is also suctioned into the openings 32a and 32b, and the formed blister 33 has conical protrusions 34a and 34b on the top edge as shown in FIG. It becomes a shape with .

A large number of the packaged products 1 are stacked to form a bundle, and in this case, the protrusions 34 a and 34 b are attached to the aluminum foil 18 (the part that covers the blister opening) of the upper packaged product.
If the tablet hits the tablet, it may be damaged or even broken, which is extremely undesirable in terms of maintaining the quality of the tablet inside.

Note that if the air suction holes are formed to open on the peripheral wall surface of the concave pocket, the blister will not be formed in a shape corresponding to the shape of the concave pocket, and the openings 32a and 32b will need to be on the bottom side of the pocket. be.

The present invention relates to a blister forming drum for forming blisters without the above-mentioned protrusions, and one embodiment thereof will be described below.

FIG. 5 shows the drum for the blister bottom shape according to the present invention, and FIGS. 6A and 6B show an enlarged view of the concave pocket around the drum.

The blister bottom drum 40 has a plurality of concave pockets 42 arranged circumferentially and axially around an aluminum drum body 41.

As shown in FIG. 8, the concave pocket 42 is made by cutting 45a to 45d into a flat cylindrical piece 43 (for example, a material with low thermal conductivity such as polyimide resin or fluororesin) from all sides using a metal saw 44. The small piece is press-fitted into the stepped hole 41a of the drum body 41 with the cut side facing downward, and a recess of a predetermined shape is formed in this small piece.

As a result, the concave pocket 42 has its peripheral wall surface 42a1, bottom wall surface 42b, and opening peripheral portion 42c formed of resin, and has four slit-shaped suction ports (distributed at the same intervals) that form the essential part of the present invention. 46a to 46d are formed.

The slit-shaped suction ports 46a to 46d are formed across the bottom wall surface 42b and the peripheral wall surface 42a.

Thereby, the concave pocket 42 is formed into a slit-like suction hole 4.
6a to 46d1 communicate with a suction pump (not shown) through holes 41b and 41c in the drum body 41.

During blister forming, the air inside the pocket is discharged through the slit-shaped suction ports 46a to 46d, and the heated vinyl chloride sheet 7 is drawn into the pocket and tightly adheres to each wall surface, forming the blister 50 shown in FIG. 7. be done.

At this time, a portion of the sheet 1 is also sucked into the suction ports 46a to 46d, but since the suction ports 46a to 46d are slits rather than small diameter holes, no protrusions are formed on the blister 50. Projections 51a to 51d are formed from the top surface 50a to the circumferential side surface 50b.

Since the total area of the suction ports 46a to 46d is relatively large, the force with which the sheet 7 is drawn into the suction ports is weak, and each suction port 46a to 46d has a narrow width (0.2 mm).
Therefore, the protrusion portions 51a to 51d have a small protrusion height and a rounded shape.

Therefore, even if aluminum foil hits the protrusions 51a to 51d, they will not be easily damaged.

Therefore, when the packaged products 1 are stacked, the aluminum foil covering the blister will not be damaged by the lower blister, and accidents such as deterioration of the quality of the tablets during storage will not occur.

Further, the protrusions 51a to 51d extend from the top surface 50a to the circumferential side surface 50b in all directions of the blister 50, and have a function of reinforcing the blister 50.

Therefore, the blister 50 is not easily crushed, and the inconvenience of crushing the packaged product during storage does not occur.

Further, the wall surface of the concave pocket 42 is entirely made of resin,
A heated sheet does not immediately cool down when it comes into contact with a wall.

Further, since the suction ports 46a to 46d are arranged on all sides of the pocket 42, the sheet is uniformly sucked from all sides.

As a result, the sheet can be made into a blister without causing local elongation, and a thinner sheet can be used than in the conventional case.

In the above embodiment, the reason why the slit-shaped suction ports are not crossed is to prevent the strength of the bottom of the pocket 42 from being excessively reduced.

Note that the number and position of the slit-like suction ports are not limited to those in the above embodiment.

As mentioned above, the blister forming drum according to the present invention has a concave pocket on the circumference and forms a blister by sucking a heated thermoplastic sheet, and the drum has a slit-like suction port formed in the concave pocket. Because of the structure, the part of the blister along the slit-shaped suction port has a rounded tip, and therefore, when packaged products are stacked and bundled, the aluminum foil covering the blister of the upper packaged product is The inconvenience of damaging the tablet is unlikely to occur), which is preferable in terms of maintaining the quality of the tablet inside the blister, and furthermore,
The protrusions have the function of reinforcing the blister, making the blister difficult to crush, and eliminating the inconvenience of unnecessarily crushing the blister during storage.

[Brief explanation of the drawing]

1A and 1B are a plan view and a side view of an example of a packaged product, respectively, and FIG. 2 is a diagram schematically showing the overall configuration of a blister pack machine to which the blister forming drum of the present invention can be applied. , FIGS. 3A and 3B show the conventional blister forming drum -
4 is a perspective view of a blister formed by the concave pockets of FIGS. 3A and 3B, and FIG. 5 is a blister molding according to the present invention. A perspective view of one embodiment of the drum, FIGS. 6A and 6B are a plan view and a sectional view taken along line VIB-VIB of the drum of FIG. 5, and FIG. 7 is a view of FIG. 6A.
FIG. 8 is a perspective view of a blister formed by the concave pockets of FIGS. 6A and 6B. 1... Packaging product, 4... Aluminum foil, 6
... Blister bag machine, 40 ... Blister forming drum, 41 ... Aluminum drum body, 42 ... Concave pocket, 43 ...
...Flat cylindrical small piece, 45a to 45d...
Cut, 46a-46d...Slit-shaped suction port, 50...Blister, 51a-51d...
・Protrusion part.

Claims (1)

[Scope of utility model registration request] A blister forming drum that has a concave pocket on its curved surface and sucks a heated thermoplastic sheet to form a blister according to the shape of the concave pocket, the concave pocket having a slit-like suction port. Drum for forming blister.