JPH03256824A - Device for heat sealing with aluminum foil heat-sealable material - Google Patents

Abstract

PURPOSE:To permit later sealing operation to be effected accurately and easily by a method wherein, in the process of drawing out sealing material, the seal piece formed by giving the sealing material a folding line or stamping it out is made to curve in the direction opposite to its curling direction. CONSTITUTION:Sealing material 21 is passed around a guide pulley, folded in a longitudinal direction, inserted into an elongated hole formed by both the slits 32a and 33a of a folding device 31, unfolded into the original form and the sheet material thus spread out is supplied to a delivery device. When the sealing material 21 is set in a predetermined position on a lower die 38b of a die set 38, a suctorial transfer part 47 is moved upwards by the action of a cylinder 45 and, at the same time, an upper die 38a thereof is moved downwards, whereby a seal piece 51 is stamped out by the die set 38 into a predetermined shape. In this case, since the outer peripheral part of the sucking face is made slightly higher than its central part, the seal piece 51 is curved in the direction opposite to the regular curling direction by the sucking action of vacuum holes 47a, and 47b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a heat sealing device for sealing the bottom or top surface of a container or the like by heat sealing aluminum foil.

(Problems to be Solved by the Prior Art and the Invention) Recently, powdered coffee is sealed in a cup-shaped airtight container, and when you want to drink coffee, you can pour hot water into the powdered coffee and use the conventional drip coffee method. A device that can also be used to brew coffee in the same way as the formula has been developed.

That is, FIG. 5 is a vertical perspective view showing the state in which the powdered coffee is sealed in a closed container, and inside the cup-shaped container 1 made of thin plastic, there is a filter paper 2.
is spread, powdered coffee 3 is filled on the filter paper 2, and the top thereof is sealed with a top seal piece 4 made of aluminum foil. A small hole 5 is also formed in the bottom of the container 1, and the small hole 5 is also sealed with a bottom seal piece 6 made of aluminum foil.

When you want to drink coffee, peel off the bottom seal piece 6 attached to the outside bottom of the container, peel off the top seal piece 4, place the container 1 on top of a pre-warmed coffee cup, and pour hot water into the container 1. When poured into the coffee cup, the coffee filtered by the filter paper 2 is poured into the coffee cup through the small holes 5.

By the way, when such a container is sealed with a thin sealing piece such as aluminum foil as described above, a conventional method is used.

That is, when sealing the bottom of the container, a predetermined amount of aluminum foil heat-sealing material wound into a coiled tape is delivered by a delivery device, cut into seal pieces of a predetermined length by a cutter, and the seal is removed. A method is to adsorb the piece using a suction device and send it to the heat sealing device section, or a method in which the tip of a tape-shaped aluminum foil heat sealing material wound into a coil is gripped by a pulling device and a predetermined amount of the sealing material is pulled out. , a method of cutting the seal pieces into predetermined length seal pieces with a cutter and sending the seal pieces to the heat sealing unit using the above-mentioned drawing device can be considered.

However, aluminum foil heat-sealing materials are generally formed by layering an overcoat material of several microns on the surface of an aluminum foil material with a thickness of several microns to several tens of microns, and providing an adhesive layer on the back surface. Therefore, if the thickness of the aluminum foil material constituting the base material of the sealing material is thin or less than a predetermined value, when the aluminum foil heat sealing material that has been wound into a coil is simply unwound, the shrinkage rate will be 3 layers. There is a tendency for the adhesive layer to curve outward, that is, to curl, due to the difference in the adhesive layer.

Therefore, in the method of cutting out seal pieces while extruding the aluminum foil heat sealing material as described above, as shown in FIG. Therefore, the sealing material 8 is not inserted smoothly into the cutter 9, and the sealing material 8 tends to curve into a bellows shape due to the feeding action of the extrusion roller 7. Also, the sealing material 8 cut by the cutter 9 also curls. There is a problem that the seal piece cannot be accurately attracted by the conveying device 10, and the subsequent heat sealing operation may be incomplete.

In addition, in the case where the sealing material is pulled out sequentially by a predetermined length using a pulling device, the mechanism of the pulling device itself is complicated and there is a gripping portion at the tip for gripping the sealing material. When conveying containers, etc. above, the gripping part may hit the containers, etc., so to avoid this, the size of the sealing piece must be made larger than necessary, and since there are many steps, high speed is required. There are problems such as becoming a bottleneck to the development of the government.

In addition, since the top seal piece that seals the top surface inside the container 1 needs to match the shape of the container, the aluminum foil heat sealing material wound into a coil is intermittently pulled out by a winding roller, and the coil part and A sealing piece of a predetermined shape is punched out from the drawn-out heat sealing material using a die set provided between the take-up rerollers. Then, the seal piece is sucked by a suction conveyance device and loaded into a container, and then the container is conveyed to a heat sealing section, where the seal piece is adhered to the container.

However, even in such a case, there is a problem in that the sealing piece loaded into the container curls with the adhesive layer facing outward as described above, making the subsequent heat sealing operation extremely difficult.

In view of these points, the present invention has been developed to reliably prevent curling of sealing pieces even when using a thin aluminum foil heat sealing material, and to ensure that heat sealing work can be performed reliably and easily. The purpose of the present invention is to obtain a heat sealing device using an aluminum foil heat sealing material.

[Structure of the invention]

(Means for Solving the Problems) The present invention involves sequentially feeding out the sealing material from a coil of aluminum foil heat sealing material coated with an adhesive layer on one side, cutting out sealing pieces of a predetermined length, and is conveyed onto the part to be sealed by a suction device, and the part to be sealed is heat-sealed by the sealing piece,
In a heat sealing device using aluminum foil heat sealing material, the aluminum foil heat sealing material is once bent into a half-width shape along the longitudinal direction between the coil of the sealing material and the sealing material feeding device, and then the aluminum foil heat sealing material is The invention is characterized in that it is provided with a half-folding device that creates a fold extending in the direction.

Further, the second invention includes forming a sealing piece of a predetermined shape by punching from an aluminum foil heat-sealing material having an adhesive layer layered on one side, and conveying the sealing piece onto the part to be sealed by a suction device, In a heat-sealing device using an aluminum foil heat-sealing material that heat-seals the portion to be sealed using the sealing piece, the outer circumferential portion of the suction surface of the suction device is made to protrude slightly from the center, and the center of the suction surface is It is characterized by having vacuum holes formed in the inner and outer circumferential parts.

(Function) In the process of drawing out the sealing material from the coil of sealing material, the sealing material is once folded in half by the folding device and creases are formed, or the sealing pieces formed by punching are sucked by the suction device. By slightly curving the seal piece in a direction opposite to the direction in which it is intended to curl, the tendency of the seal piece to curl is corrected. Therefore, the feeding of the sealing material or the heat sealing operation can be performed very easily.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 20 denotes a drum on which a tape-shaped aluminum foil heat sealing material 21 is wound in a coil shape, and the aluminum foil heat coil material 2 unwound from the drum 20.
1 is a plurality of guide pulleys 22m, 22b, 22c, 22
d and 22e, it is sent forward by the sending device 23, inserted into the cutter 25 through the guide member 24 provided in front of the sending device 23, and projected forward from the cutter 25. It is being done.

In front of the cutter 25, a suction device 26 for suctioning the tip of the sealing material protruding forward from the cutter 25 is provided so as to be rotatable around a vertical axis.
On the opposite side of the container 6 from the cutter 25, a container support stand 27 for supporting the container 1 with its bottom facing upward is rotatably disposed about a horizontal axis 28. A heat sealing tool 29 is provided above the container support stand 27 so as to be movable up and down. Note that 30 in the figure is a vacuum pipe connected to a vacuum source (not shown).

Incidentally, a half-folding device 31 is provided between the guide pulleys 22c and 22d for folding the tape-shaped aluminum foil heat sealing material 21 into a half-width shape along the longitudinal direction and creating a crease extending in the longitudinal direction. There is.

As shown in FIG. 2, the half-folding device 31 is composed of a main plate 32 bent in an L-shape and a sub-plate 33 placed and engaged with the main plate 32. A slit 32a extending in the transverse direction from one side is provided in the sub-plate 33, and a slit 33a extending from the side edge in the opposite direction from the slit 32a is formed in the sub-plate 33 at a position corresponding to the slit 32a. . When the sub-plate 33 is mounted and fixed on the main plate 32, both slits 32a, 3
3a, a long hole having a length corresponding to half the width of the aluminum foil heat sealing material 21 is formed.

After passing through the guide pulley 22c, the aluminum foil heat sealing material 21 unwound from the drum 20 is folded in half along the longitudinal direction through both slits 3 of the rear folding device 31.
The guide pulley 22d is inserted into the long hole formed by 2a and 33a, and then expanded to its original state.
It is supplied to the sending device 23 side via etc.

Therefore, the tendency of the aluminum foil heat sealing material 21 to curl is corrected by the half-folding operation of the half-folding device 31, and the aluminum foil heat-sealing material 21 is maintained in a flat state. Therefore, the aluminum foil heat sealing material 21 is effectively sent out by the feeding device 23, and the guide member 2
4 into the cutter 25, and is then sent out so as to protrude forward from the cutter 25 by a predetermined length while maintaining a flat plate state.

In this way, when the aluminum foil heat sealing material 21 is projected by a predetermined length in front of the cutter 25, the suction device 2
6 is activated, and the tip of the aluminum foil heat sealing material 21 is sucked and held from above. Immediately thereafter, the cutter 25 is operated to cut the aluminum foil heat sealing material 21, and a sealing piece of a predetermined length is sucked and held by the suction device 26.

Then, the suction device 26 is rotated 180 degrees around the vertical axis, the seal piece is placed on the bottom surface of the container 1 held on the container holding table 27, and then the heat sealing tool 29 is lowered and the sheet is Heat sealing of the pieces is performed.

On the other hand, FIG. 3 is a diagram showing a seal piece supply device for sealing the upper surface side of the container, in which a tape-shaped aluminum foil heat sealing material 21 is unwound from a drum 35 wrapped in a coil shape. The aluminum foil heat sealing material 21 is passed through a guide pulley device 36 and a tension pulley 37, inserted into a die mot 38 for punching out seal pieces, and further connected to a winding drum 41 via a tension pulley 39 and a guide pulley 40.

When the aluminum foil heat seal material 21 is moved by a predetermined amount by the winding drum 41, the upper mold of the die set 38 is lowered, and the aluminum foil heat seal material 21 is punched out by the action of the lower mold to form a seal of a predetermined shape. Pieces are formed.

This seal piece is punched out at the same time as the die set 3.
8, the seal piece is sucked by the suction device 42 rotating downward, and then, as the suction device 42 rotates about the horizontal axis 43, the seal piece is moved onto a predetermined container, and the seal piece is placed in the container. Seal pieces are supplied. Thereafter, the container is transported to a heat sealing section (not shown) and heat sealed using a sealing piece.

When the punching of the seal piece is completed as described above, the aluminum foil heat sealing material 21 is wound up to a predetermined length,
The next seal piece is punched out, and the same operation as described above is repeated thereafter.

By the way, FIG. 4 is an enlarged partial view of the suction device 42, and a boss portion 44 fixed to the horizontal shaft 43 has a horizontal shaft 4
A cylinder 45 extends in the radial direction with respect to the cylinder 45, and a suction conveyance section 47 is provided at the tip of a piston rod 46 that is extendable and retractable with respect to the cylinder 45.

The suction conveyance section 47 has its tip surface forming a suction surface, and the outer peripheral portion of the suction surface is formed so as to slightly protrude from the center portion. In addition, the suction conveyance section 4
Vacuum holes 47 are provided in the center and outer periphery of the suction surface of 7.
a, 47b are bored, and this vacuum hole 47a
, 47b communicate with each other through a ventilation passage 48 extending in the radial direction, and a ventilation passage 49 extending in the axial direction is communicated with the ventilation passage 48, and this ventilation passage 49 is connected to a vacuum device (not shown) via a conduit 50. has been done.

Therefore, the aluminum foil heat sealing material 21 is attached to the die set 3.
When the die set 38 is set at a predetermined position on the lower mold 38b of the die set 38, the suction conveyance section 47 is moved upward by the operation of the cylinder 45, and the upper mold 38a of the die set 38 is lowered.
A seal piece 51 having a predetermined shape is punched out using the die set 38 . The seal piece 51 formed by punching in this way is supported on the suction surface of the suction conveyance section 47,
It is attracted to the suction surface by the suction action of the vacuum holes 47a and 47b.

In this case, since the outer peripheral part of the suction surface is slightly higher than the central part, the suction action of the vacuum holes 47a and 47b causes the seal piece 51 to curl in the opposite direction to the normal curling direction, as shown in FIG. Therefore, the tendency of the sealing piece 51 to curl is corrected by this curving action.

When the seal piece 51 is suctioned to the suction surface as described above, the suction conveyance section 47 is contracted by the cylinder 45 and rotated in the direction of the arrow by the horizontal shaft 43 to try to seal the piece placed below. It is moved above a container (not shown), and the sealing piece 51 is supplied into the container by releasing the adsorption action. Then, the container supplied with the sealing piece 51 is moved to a predetermined heat sealing section.

Since the seal piece 51 supplied into the container has its curl correction removed when it is adsorbed to the suction surface, the seal piece does not curl while being transferred to the heat sealing material work section. This will not make subsequent work difficult.

In the above embodiment, the case where the container is heat-sealed with the aluminum foil heat-sealing material has been described, but the present invention can also be applied to other parts to be sealed.

〔Effect of the invention〕

As described above, in the present invention, a device for folding the sealing material in half is provided during the feeding process of the aluminum foil heat sealing material, or the suction surface of the suction device is configured in a specific manner, so that curling of the sealing material or the sealing piece is avoided. This removes the tendency to cause damage, allowing subsequent sealing operations to be performed easily and accurately. Moreover, since the tendency to curl is eliminated, there is no need to make the aluminum foil itself thicker than necessary.

[Brief explanation of drawings]

1 and 3 are diagrams showing the schematic configuration of the heat sealing device of the present invention, FIG. 2 is an exploded perspective view of the half-folding device, and FIG. 4 is a partially enlarged sectional view of the suction device of the present invention,
FIG. 5 is a vertical perspective view of a powdered coffee loading container, and FIG. 6 is an explanatory diagram showing the curling tendency of the heat sealing material in a conventional device. 21... Aluminum foil heat sealing material, 23... Feeding device, 25... Cutter, 26... Adsorption device, 2
9... Heat sealing tool, 31... Half-folding device, 38.
...Die set, 42...Adsorption conveyance device, 45...
Cylinder, 47a, 47b...vacuum hole.

Claims (1)

[Claims] 1. Sequentially feed out the sealing material from a coil of aluminum foil heat sealing material with an adhesive layer layered on one side, cut out sealing pieces of a predetermined length, and cover the sealing pieces with a suction device. In the heat sealing device using the aluminum foil heat sealing material, which is conveyed onto the sealing part and heat sealing the sealed part with the sealing piece, between the coil of the sealing material and the sealing material feeding device,
A heat-sealing device using aluminum foil heat-sealing material, comprising a half-folding device that folds the aluminum foil heat-sealing material into a half-width shape along the longitudinal direction and creases the aluminum foil heat-sealing material in the longitudinal direction. . 2. Form a sealing piece of a predetermined shape by punching from an aluminum foil heat-sealing material with an adhesive layer layered on one side, and convey the sealing piece onto the part to be sealed by a suction device, and use the sealing piece to cover the part to be sealed. In a heat-sealing device using an aluminum foil heat-sealing material that heat-seals the sealing part, the outer peripheral part of the suction surface of the suction device is made to protrude slightly from the center, and a vacuum is applied to the central and outer peripheral parts of the suction surface. A heat sealing device using an aluminum foil heat sealing material, characterized by having holes formed therein.