JPH0911333A - Manufacturing method for container for packaging synthetic resin and apparatus therefor - Google Patents

Abstract

PURPOSE: To manufacture a packaging container which is not restricted by the shape of a bottom plate, has strong adhesive force of a joining surface, and hardly slips even when piled by inserting a heater part which can advance and retreat freely between a frame body formed individually and the joining place of the bottom plate and melting the joining place. CONSTITUTION: A frame body supply apparatus 10 is equipped with a fixed plate 11 for setting a frame body F at a prescribed position by advancing from all quarters, and the fixed plate 11 is constituted to be able to advance and retreat freely in the horizontal direction. A bottom plate supply apparatus 20, after sucking one bottom plate B at the stock position of the plate B, transfers the plate B on the frame body F which is positioned by the frame body supply apparatus 10 to match a joining place. When a heater part 31 which is supported by a support part 32 which can move freely in the vertical direction and in the advance-retreat direction to the bottom plate B is advanced to the bottom plate B, the heater part 31 can be inserted between the bottom plate B and the frame body F so that a heater 30 can heat-melt the joining part between the frame body F and the bottom plate B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a synthetic resin packaging container. Related.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing a synthetic resin packaging container, for example, when a container including a frame and a bottom plate has a rectangular outer shape, a peripheral side frame is used. After arranging a rectangular frame and placing the bottom plate on the joint of this frame, the outside of the bottom plate (back side)
A heat-sealing plate is applied to the base plate to heat it, and heat is transferred through the bottom plate to melt the joint portion, whereby the bottom plate and the frame body are heat-sealed.

As a packaging container manufacturing apparatus, a frame body supplying device for supplying a frame body, a bottom plate supplying device for supplying a bottom plate to a joint portion of the frame bodies, and a bottom plate supplied to the frame body are provided. It was provided with a heat-sealing plate that melts the joining point from the side opposite to the joining portion of the bottom plate. However, in the above-described manufacturing method and manufacturing apparatus, the heat-sealing plate is applied to the outside (back surface side) of the bottom plate and heat is transferred through the bottom plate to melt and heat-bond the joint part, so that the heat applied to the joint part is reduced. Since the conduction efficiency is poor and it takes time to melt,
There is a drawback that the manufacturing efficiency of the packaging container cannot be improved.

In the manufacturing apparatus using this heat-sealing plate, 1
As a cycle for manufacturing individual packaging containers, the time required for heating is about 3 seconds in the relatively high temperature period from spring to autumn, and about 4 seconds in the low temperature winter season.
It has been a challenge to shorten this time. Further, since the joints are melted and heat-sealed from the back side of the bottom plate, the joints may not be sufficiently melted, the adhesive strength may be insufficient, and defective products may be produced.

Further, as shown in FIG. 9, a heat fusion plate 90
Generally has a flat plate shape, and therefore, in the portion N except the joint surface M between the frame body 91 and the bottom plate 92, if the heat fusion plate 90 and the bottom plate 92 come into contact with each other, the bottom plate 92 melts. So
There is also a problem that the shape of the bottom plate 92 must be a raised bottom shape, and the shape of the bottom plate 92 is restricted.

Further, since the back side of the bottom plate is also melted by the heat-sealing plate, the back side becomes smooth when the bottom plate is solidified, and when the manufactured packaging containers are stacked, the friction coefficient is small and slippage occurs. It also had the drawback of being easy. Therefore, in view of the above problems, the present invention can shorten the manufacturing cycle of the packaging container, and can manufacture the packaging container without restricting the shape of the bottom plate. An object of the present invention is to provide a method and an apparatus for manufacturing a packaging container which has excellent adhesive strength and is slippery even when stacked.

[0007]

As a manufacturing method of the present invention for achieving the above object, a frame body which is a peripheral side frame of a synthetic resin packaging container and a bottom plate which is a bottom portion are individually formed. Then, insert a heater part that can move back and forth between the joints of the frame and bottom plate to melt the joints of both, and then retract the heater and press them together to heat-bond the joints. The feature is to let.

Further, as the manufacturing apparatus of the present invention, a frame body supplying means for positioning a frame body, which is a peripheral frame of the synthetic resin packaging container, at a predetermined position, and a bottom plate, which is a bottom portion, are joined to the frame body. It has a bottom plate supply means that can supply the pressure to the location and press it to the frame side, and a heater part that is inserted between the joining points of the frame and the bottom plate to melt the joint surface of both and to be able to retract after melting. It is characterized in that a heating device and a control means for operating each of the above means and the heating device at a predetermined timing are provided.

Further, according to a third aspect of the manufacturing apparatus of the present invention, there is provided a bottom plate supply means for positioning a bottom plate serving as a bottom portion of the synthetic resin packaging container at a predetermined position, and a frame body serving as a peripheral side frame with the bottom plate. It is configured so that it is supplied to the joining point and is inserted between the frame feeding means that can be pressed to the bottom plate side and the joining point between the bottom plate and the frame to melt the joining surfaces of both, and it can be retracted after melting. A heating device having a heater portion and a control device for operating the above-mentioned means and the heating device at a predetermined timing may be provided.

[0010]

According to the manufacturing method of the above invention, since the heater part which can be moved back and forth is inserted between the joint parts of the frame body and the bottom plate which are individually formed to melt the joint parts of both, the heater part is a frame. The body and the bottom plate can be heated directly. And
Since the heater part can move back and forth, only the joining part is heated according to the shape of the frame, and the other parts are not heated.
After heating, the heater portion is retracted and pressed against each other to heat-bond the joints, so that it is possible to quickly fuse the waste heat without being transferred.

According to the above-mentioned invention device, the frame body supplying means positions the frame body, which is the peripheral frame of the synthetic resin packaging container, at a predetermined position, and the bottom plate supplying means arranges the bottom plate serving as the bottom part with the frame body. Supply it to the joints and match the joints of the frame and the bottom plate. A heater part that can move back and forth is inserted between the joining points to melt the joining surfaces of the two. When the joint surfaces are melted,
As the heater part retracts, the bottom plate is pressed and both are heat-sealed. The control means operates each of the above means and the heating device at a predetermined timing to manufacture the packaging container.

According to the third aspect of the invention, after the bottom plate is positioned, the frame body can be supplied to the joint portion with the bottom plate and heat-sealed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram of a packaging container manufacturing apparatus showing an embodiment of the present invention, FIG. 2 is a plan view of a central portion of the above embodiment, and FIG. 3 is an enlarged view of a main part of the above embodiment.
The apparatus for manufacturing a packaging container of this example shows, as a packaging container, an example of a container having a square outer shape and a shallow bottom, showing a container used as a so-called bento container, and a frame body serving as a peripheral frame. The bottom plate serves as the bottom (similar to the frame body 91 and the bottom plate 92 shown in FIG. 8).

In the manufacturing apparatus of this embodiment, a frame body supplying device 10 for positioning the frame body F at a predetermined position, and a bottom plate for setting a bottom plate B on the bottom side of the frame body F positioned by the frame body supplying device 10. The supply device 20, the heating device 30 capable of heating and melting the joint portion between the frame F and the bottom plate B, and the control device 40 for operating the frame supply device 10, the bottom plate supply device 20, and the heating device 30 at a predetermined timing. It has and.

The frame body feeding device 10 advances from four sides of the frame body F conveyed by the supply conveyor 15 from the stock position (not shown) of the frame body F and sets the frame body F at a predetermined position. A fixed plate 11 is provided, and this fixed plate 1
1 is attached to the tip of an air cylinder 12 that reciprocates in the horizontal direction, and is configured to be movable back and forth. Of the air cylinders 12, at least two along the feed direction of the supply conveyor 15 are movably supported up and down,
When the frame F is supplied or discharged, it rises and the fixed plate 11
Are configured so as not to interfere with the passage of the frame body F.

The bottom plate supply device 20 comprises a press plate 22 having a suction part 21 capable of vacuum-sucking the bottom plate B, and a support part 23 for supporting the press plate 22 and for moving it vertically and horizontally. It has. This bottom plate supply device 2
0 is vertically and horizontally so that one bottom plate B can be sucked at the stock position of the bottom plate B, and then the bottom plate B can be moved onto the frame body F positioned by the frame body supply device 10 to align the joining points. It is configured to be rotatable. The bottom plate supply device 20 supplies the bottom plate B to the frame body F at a position with an interval of about 5 mm immediately before fusion bonding, and after melting, gently presses the bottom plate B against the frame body F to rise. Is something that can be done.

The heating device 30 comprises a thin plate-shaped heater portion 3
1, the heater portion 31 is supported by a support portion 32 that is movable in the up-down direction and in the advancing / retreating direction with respect to the bottom plate B. When the heater portion 31 is advanced to the bottom plate B, it can be inserted between the bottom plate B and the frame F, and the amount of advance can be adjusted according to the size of the packaging container to be manufactured. In this embodiment, the heater unit 3
The advancing amount of 1 is adjusted so as to overlap the plate thickness of the frame F.

The control device 40 uses the frame positioning device 1 described above.
0, the bottom plate supply device 20, and the heating device 30 are configured by a known sequencer or the like that operates movable parts such as air cylinders at predetermined timings. The control device 40 may be configured by a computer including a CPU (Central Processing Unit) other than the sequencer and the like.

The operation of the manufacturing apparatus of this embodiment and the manufacturing method of the present invention will be described with reference to FIG. First, the frame body supply device 10 is driven to move the frame body F to the supply conveyor 15
Then, the fixing plate 11 on the supply side passes the frame body F at a slightly raised position. The fixing plate 11 located on the discharge side is in a state of waiting for the frame body F.
When the frame F comes into contact with the fixed plate 11, the rotation of the supply conveyor 15 is temporarily stopped, and the fixed plates 11 on the other three sides advance toward the frame F to surround and press the frame F. The body F is set at a predetermined position (see FIG. 2).

Next, the bottom plate supply device 20 is driven,
A single bottom plate B is adsorbed from the storage space where a large number of adsorbing parts 21 are stacked and stocked, and the supporting part 2 remains adsorbed.
3 rotates to carry the bottom plate B to the upper side of the frame body F and align the joining points. The bottom plate B and the frame body F are arranged so that there is a gap of about 5 mm between them (see FIG. 4 (a)). The heating device 30 is driven in parallel with the operation of supplying the bottom plate B, the heater portion 31 moves forward and is inserted between the frame body F and the bottom plate B, and overlaps by the plate thickness of the frame body F (Fig. Four
(b)). When the heater part 31 is inserted, the heater part 31 directly heats both the joint surfaces of the frame F and the bottom plate B at the same time to melt them. The temperature of the heater section 31 at this time is set to 320 ° C.

When the thickness of the frame F is 4.0 mm and the thickness of the bottom plate B is 1.2 mm, heating by the heater part 31 is performed for 1.8 seconds, and the heater part 31 is immediately retracted from the joining point. (See FIG. 4 (c)), and at the same time, the bottom plate B is lightly pressed toward the frame body F to completely heat-bond the joint surfaces. The frame body F and the bottom plate B are joined by this welding, and the manufacturing of the packaging container is completed.

Next, the fixing plate 11 on the discharge side is raised (see FIG. 4 (d)), and the supply conveyor 15 is driven to send the completed packaging container to the product stocker on the discharge side. As described above, according to the manufacturing apparatus of this embodiment, since the heater portion 31 directly melts the joint portion between the frame body F and the bottom plate B, the thermal conductivity from the heater portion 31 is good,
Thermal fusion is completed in a short time. In addition, since the joining surfaces can be melted as much as necessary for the fusing, the adhesive force is strong and there is no fear of peeling.

Further, since the heater portion 31 is inserted by the thickness of the frame body F, even if the shape of the bottom plate B is, for example, a shape that bulges downward to the bottom, the heater portion 31 becomes an obstacle. There is no such thing. Therefore, the bottom plate B having various shapes can be welded to the frame body F to manufacture the packaging container. Further, since the heater part 31 is formed in a plate shape and is movable back and forth, if the frame F has a rectangular shape, it can be easily changed to various sizes by changing the amount of advance and its position. Can be adapted. Further, by constructing one heater part 31 by dividing it into small parts,
The width of the heater portion 31 can be adjusted, and the heater portion 31 can be used for manufacturing packaging containers of various sizes.
Furthermore, by forming the circular heater unit 31,
It is easy to accommodate a packaging container having a round outer shape.

When the heater portion 31 is divided as described above, the fixing plate 11 is also divided, which is convenient for manufacturing packaging containers of different sizes by one apparatus. Become. Also, the heater section 31
Does not heat the back side of the bottom plate B, the back side remains as it was during molding, and the back side is not smoothed, so that it does not slip and collapse when stacked.

As another embodiment of the present invention, it is possible to present the one in which the positional relationship between the frame body supply device 10 and the bottom plate supply device 20 of the above embodiment is opposite.
That is, as shown in FIG. 5, a bottom plate supply device 50 (having substantially the same configuration as the frame body supply device 10 of the above embodiment) having a structure for supplying a bottom plate by a supply conveyor is provided, and as a frame body supply device 60, For example, as shown in FIG. 6, a suction portion 61 that sucks a plate thickness portion of a frame similar to the suction portion of the above embodiment.
In addition to those including the above, it is possible to disclose an attachment type having a widened portion 65 as shown in FIG. 7.

As another example of the fixed plate 11 provided in the frame supply device 10 or the bottom plate supply device 50, as shown in FIG. 8, a guide guide 17 provided along the moving direction of the supply conveyor 15 is provided. It is provided so as to face each other,
Supply conveyor 15 at a predetermined position while conveying frame F and the like.
Can be stopped or a fixing plate can be provided only on the downstream side for positioning. In this case, since it is not necessary to provide the fixing plates on the four sides, the structure can be simple. The guide guide 17 is configured to be adjustable in the direction orthogonal to the transport direction,
It is possible to accommodate different sizes such as the frame F.

[0027]

As described above, according to the manufacturing method and the manufacturing apparatus of the packaging container of the present invention, since the heater portion directly melts the joint portion of the frame body and the bottom plate, the thermal conductivity from the heater portion is high. Therefore, the frame and the bottom plate can be heat-sealed in a short time. Also, the adhesive strength is strong and there is no fear of peeling. Furthermore, since the back side of the bottom plate is not melted, the back side of the bottom plate is not smoothed, and the completed packaging containers do not slip even when stacked.

Further, the heater portion is constructed so as to be movable back and forth with respect to a joint portion between the frame body and the bottom plate, and the amount of advancement of the heater portion or the like can be changed so that the heater portion can be inserted by the thickness of the frame body. Since the heater part does not interfere with the bottom plate, it is possible to create frames and bottom plates of any size and shape, and manufacture packaging containers of various shapes without being restricted by the shape. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing a packaging container showing an embodiment of the present invention.

FIG. 2 is a plan view of a central portion of the above embodiment.

FIG. 3 is an enlarged view of a main part of the above embodiment.

FIG. 4 is a schematic view for explaining the operation of the manufacturing apparatus of the above embodiment.

FIG. 5 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a frame supply device of the above embodiment.

FIG. 7 is a front view showing another example of the frame supply device.

FIG. 8 is a plan view showing still another example of the frame body supply device.

FIG. 9 is a cross-sectional view of a main part showing an example of manufacturing a packaging container using a conventional heat-sealing plate.

[Explanation of symbols]

 10,60 Frame supply device 20,50 Bottom plate supply device 30 Heating device 31 Heater section 40 Control device F Frame body B Bottom plate

Claims (3)

[Claims] 1. A heater section in which a frame body serving as a peripheral side frame of a synthetic resin packaging container and a bottom plate serving as a bottom portion are individually formed, and which is movable back and forth between a joint portion between the frame body and the bottom plate. Is inserted to melt both joints, and then the heater portion is retracted to press the two to heat-bond the joints, thereby manufacturing a synthetic resin packaging container. 2. A frame body supplying means for positioning a frame body, which is a peripheral side frame of a synthetic resin packaging container, at a predetermined position, and a bottom plate, which is a bottom part, are supplied to a joint portion between the frame body and the frame body side. A bottom plate supply means that can be pressed, a heating device that has a heater portion that is inserted between the joint portions of the frame body and the bottom plate to melt the joint surfaces of both, and that is capable of retracting after melting; An apparatus for manufacturing a synthetic resin packaging container, comprising: a control means for operating a heating device at a predetermined timing. 3. A bottom plate supply means for positioning a bottom plate serving as a bottom part of a synthetic resin packaging container at a predetermined position, and a frame body serving as a peripheral side frame are supplied to a joint portion with the bottom plate and pressed to the bottom plate side. A possible frame body supplying means, a heating device having a heater part which is inserted between the joint parts of the bottom plate and the frame body to melt the joint surface of both, and is capable of retracting after melting, and each of the above means. And a control means for operating the heating device at a predetermined timing, the manufacturing device for a synthetic resin packaging container.