JPS6224259B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heating blade for manufacturing assembled containers.

Conventionally, in manufacturing synthetic resin containers such as food containers, a developing plate having a container expanded shape is prepared in advance, and after heating and melting the side plate ends of the developing plate, the developing plate is A so-called assembling molding method is known in which a container is assembled into a box shape by pushing the container into a mold to make the side plates stand up, and then fusing the ends of the side plates to each other to obtain a container.

However, in the conventional method, when heating and melting the end of the side plate of the developing plate, the developing plate is moved downward, and during the movement, the end of the side plate of the developing plate is brought into contact with or without contact with the heating blade. The method of heating and melting with a heating blade or, conversely, moving the heating blade downward and heating and melting the end of the side plate of the expansion plate is adopted, but in either case, as shown in Figure 9. As shown, since the heating surface 1a of the heating blade 1 is formed vertically, the melting surface 2 at the end of the side plate is vertical, and the angle θ ₁ between it and the side 3 of the side plate is approximately a right angle. Therefore, when the end portions of the side plates are fused together by being pushed into the mold, unfused portions 4 are formed at the outer and inner ends of the fused portion, respectively, as shown in FIG. The drawback was that the bonding area was small and only a low welding strength could be obtained. In addition, when the developing plate is moved downward and the end of the side plate is brought into contact with the heating blade and heated and melted, a molten protuberance 5 is generated on the molten surface as shown in FIG. As shown in FIG. 10, a protrusion 5 appeared in the shape of a protrusion at the inner end of the fused portion, causing a poor appearance. In particular, when printing is applied to the outer surface of the development plate, the printing ink comes out together with the melted protuberances 5 at the inner end of the fused part, that is, inside the container, which poses food hygiene problems when used as a food container. Ta.

The present invention solves the above-mentioned drawbacks of the prior art, has a high fusion strength at the fused end of the side plate part, is free from poor appearance due to molten protrusions, and is used to manufacture assembled containers that are good in terms of food hygiene. The purpose is to provide heating blades.

That is, the present invention has a tapered surface that heats and melts the end of the side plate of the assembly container deployment plate on the bent side of the side plate, and a flat surface for guiding the deployment plate that is connected to the tapered surface. The object of the present invention is to provide a heating blade for producing assembled containers, which is characterized by having a section.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a heating blade 11 for manufacturing assembled containers, which is one embodiment of the present invention. This heating blade 11 is used to heat and melt the side plate end portion 34a when manufacturing the assembled container expansion plate 32. In this embodiment, the assembly container deployment plate 32
The boat-shaped container expansion plate 32 is heated and melted, and has a substantially triangular prism shape to match the shape of the gap between the ends of the expansion plate 32. The heating blade 11 has a tapered surface 21, and the tapered surface 21 allows the side plate end 34a to be heated and melted in a tapered shape toward the bent side of the side plate 34. In addition, the heating blade 11
has a flat portion 55, which is connected to the tapered surface 21 and serves as a guide for the expansion plate 32. In addition, the heating blade 11 is inserted into the heating means insertion hole 14.
In that case, an appropriate heating means 15 such as a heater is inserted into the insertion hole 14.

The unfolding plate 32 has the unfolded shape of a container as shown in FIG. 3, and consists of a bottom plate part 33 and a plurality of (for example, four in the case of a square container, six in the case of a hexagonal container) side plate parts 34, A concave groove-shaped bent line 35 is formed at the boundary between the bottom plate part 33 and the side plate part 34. Such a developing plate 32 can be obtained by a known method such as punching out a single synthetic resin sheet using a developing plate manufacturing apparatus equipped with a cutting blade and a pressing blade. Further, the material of the expansion plate 32 is a thermoplastic resin, and although a non-foamed resin can be used as the resin, a foamed resin is particularly preferably used. Various resins can be used as the foamed resin, but polystyrene-based resins such as polystyrene homopolymer, styrene-maleic anhydride copolymer, and impact-resistant polystyrene prepared by blending butadiene or the like with polystyrene are particularly preferred.

When heating and melting the expansion plate 32 using the heating blade 11, each end of the side plate portion 34 of the expansion plate 32 can be brought into contact with the tapered surface 21 of the heating blade 11 and heated. .

In addition, when manufacturing a rectangular container, the heating blade 11 of the present invention can be shaped in accordance with the shape of the source between the ends of the side plate portion of the expansion plate, as shown in FIG. A similar solution can be used when manufacturing containers.

Next, a process of actually manufacturing the assembled container 40 using the assembled container manufacturing apparatus shown in FIG. 6 incorporating the heating blade 11 of the present invention will be explained.

Operate the air cylinder 26 to remove the piston shaft 2.
7 in the direction of arrow a shown in FIG. At this time, the guide frame 30 is guided by the guide shaft 31 and slides in the direction a, and stops when the press plate 12 is located at the expansion plate supply section 36. At this point, the air cylinder 22 is activated, the piston shaft advances downward, and the press plate 12 descends (sixth
(Fig.), when the suction cup 23 comes into contact with the expansion plate 32, the pressing plate stops descending, and at the same time, the suction device operates to suction and hold the expansion plate 32. Next, the piston shaft retracts upward and the pressing plate 12 is held while sucking and holding the expansion plate.
rises and stops when it rises to a predetermined position, and at the same time, the air cylinder 26 is actuated and the piston shaft 27 retreats in the direction of arrow b, causing the guide frame 30 to slide in the direction of arrow b. 12 and the developing plate 32 are moved to the molding section 43. When the pressing plate 12 and the developing plate 32 reach a position above the mold 10 and below the heating blade 11, the movement in the b direction is stopped (FIGS. 6 and 11A).

Next, the air cylinder 22 is activated and the press plate 12
When the unfolding plate 32 rises and reaches the heating blade 11 located above, the side plate end 34a of the unfolding plate comes into contact with the tapered surface 21 of the heating blade 11 (FIG. 11B,
(FIG. 3), thereby heating and melting the end portion 34a. At this time, since the heating blade 11 is provided with a flat portion 55, even if the expansion plate 32 is slightly displaced, the expansion plate 32 can be corrected to the proper position against the force of the suction cup 23 to maintain the expansion plate. I can do it. Here, a tapered surface 21 is formed on the heating blade 11, and the end portion 34a contacts the tapered surface 21 and is heated and melted, so that the end portion 34a is heated and melted into a tapered shape, as shown in FIG. As shown, a tapered melting surface 44 is obtained. The angle _θ2 between the melting surface 44 and the side plate end 34b (FIG. 7) is 80°~
45° is preferred. At this time, the expansion plate 32
In order to approach or contact the tapered surface 21 in the process of rising along the flat portion 55 of the flat portion 5 of
5, the end 34a of the developing plate 32 is sufficiently preheated, easily melts and softens when it comes into contact with the tapered surface 21, and is further kept warm in the process of descending, resulting in a sharp tapered melt. A surface 44 is obtained.

After melting the end of the side plate, the press plate 12 and the expansion plate 32
descends toward the mold 10 located below, and presses the expansion plate 32 into the mold 10 by the pressing plate 12 (FIG. 11C). At this time, the side plate portion 34 of the expansion plate comes into contact with the mold inner wall 16 and stands up from the concave groove-shaped bent line 35 (FIG. 11C), and this action causes the melting surface at the end of the side plate portion to rise. 4
4 and 44 come into contact with each other and are fused and integrated, producing an assembled container 40 as shown in FIG. At this time, as described above, each of the melting surfaces 44, 44 is formed sharply, so that when they are combined and integrated, the welded portions are extremely firmly fused and can be beautifully molded.

Furthermore, when pushing the developing plate 32 into the mold 10, a receiving plate (not shown) may be abutted against the back surface of the developing plate 32, and in this case, the push-up plate 18 may function as a receiving plate.

As shown in FIG. 7, melted protuberances 45 may be formed below the melting surface 44 during the process of melting the ends of the side plates. Because it is strongly pressed, it becomes smooth and, as shown in FIG. 8, no protrusions appear at the outer end of the fused portion after molding. In addition, during the above process, since the developing plate is moved upward and brought into contact with the heating blade, no molten protuberances are generated above the molten surface 44, and therefore, after molding, the inside of the fused part is not removed as in the conventional case. There are no protrusions at the edges.

When the assembly and molding of the container is completed as described above,
The suction mechanism of the press plate 12 stops operating, releases the suction and holding of the molded container 40, and the container 40
With the press plate 12 released, the press plate 12 rises and leaves the mold 10, and then moves in the direction of the arrow a and is located again in the developing plate supply section 36. Along with this movement, the take-out plate 13 moves together with the press plate 12 in the same direction a, that is, from the container storage section 39 to the molding section 43, and stops at a position above the mold 10. At the same time, air cylinder 17
The push-up plate 18 is raised by the operation, and the molded container 40 is lifted and taken out above the mold 10. Furthermore, the air cylinder 25 is operated to lower the take-out plate 13, and when the suction cup comes into contact with the inner bottom surface of the container, the suction device is activated to suction and hold the container (FIG. 11D).
During this time, in the expansion plate supply section 36, the pressing plate 12 performs an operation of suctioning and holding the new expansion plate 32.

The take-out plate 13 holding the container 40 by suction moves in the direction of arrow b by the operation of the air cylinder 26 and returns to the container storage section 39. At this time, the pressing plate 12 and the new developing plate 32 are located above the mold 10. In the container storage section 39, the take-out plate 13 descends while holding the container 40 under suction, and places or stacks the container to be suction-held on the mounting plate 41 or other containers already stacked, and then removes the container by suction. The container is released and the container is released and the container rises again (Fig. 6). During this time, in the molding section 43, the press plate 12 performs the heating and melting work and assembly molding work as described above.

Thereafter, similar operations are repeated, and the operations of supplying the expanding plate above the mold, assembling and molding the expanding plate, and taking out the molded container from the mold are continuously and repeatedly performed.

In addition, in the above manufacturing apparatus, when heating and melting the developing plate 32, the developing plate 32 is moved upward, but as shown in FIG. It is also possible to perform this by moving the heating blade 11 fixedly and appropriately driven by an air cylinder 46 or the like downward;
As shown in the figure, when the mold 10 is provided above,
It is also possible to fix the expansion plate 32 located above the heating blade 11 between the pressing plates 18' as the pressing plate 18 and move it downward to heat and melt. In the case of FIGS. 12 and 13 above, the developing plate 32 is heated and melted and then pushed into the mold 10 to be molded.

As explained above, since the heating blade for manufacturing assembled containers of the present invention has a tapered surface, when heating and melting the end of the side plate of the assembled container deployment plate, the end is tapered toward the bent side of the side plate. It can be heated and melted, which increases the melting area at the edges, so the resulting assembled container has greater welding strength, and the melted bumps are smoothed out during welding, so no bumps will form inside. Therefore, it has a good appearance, and furthermore, since there is no inward flow of printing ink, etc., it is convenient in terms of food hygiene. In addition, since the tapered surface has a flat part for guiding the developing plate, even if there is a slight deviation in the position of the developing plate when the heating blade heats and melts the end of the side plate of the developing plate, the developing plate will not move. It has various advantages such as being able to correct the position to an appropriate position, achieving good end melting, and ultimately good end welding.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view of a heating blade for manufacturing assembled containers, which is an embodiment of the present invention, FIG. 2 is a vertical sectional view of FIG. 1, and FIG. A partially cutaway plan view showing how the heating blade of the present invention is used;
Fig. 4 is a perspective view of an assembled container obtained using the heating blade of the present invention, Fig. 5 is a perspective view showing another embodiment of the invention, and Fig. 6 is a manufactured container incorporating the heating blade of the present invention. FIG. 7 is a partially cutaway overall front view showing the device; FIG. 7 is a vertical cross-sectional view of a main part showing a state in which the end of the side plate of the expansion plate is heated and melted into a tapered shape using the heating blade of the present invention; FIG.
The figure is a plan sectional view of the main part showing the fused state in Figure 7, and Figure 9.
The figure is a vertical cross-sectional view of the main part showing the melted state of the end of the side plate by the conventional method, FIG. 10 is a plan cross-sectional view of the main part showing the fused state of FIG. 9, and FIGS. 11 A to D are the manufacturing process of the assembled container. FIGS. 12 and 13 are similar front views showing other embodiments of the manufacturing process shown in FIG. 11. 11...Heating blade, 21...Tapered surface, 32...
...Assembled container deployment plate, 34...Side plate part, 34a...
Side plate end portion, 40...assembly container, 55...flat portion.

Claims (1)

[Claims] 1. The end of the side plate of the assembly container deployment plate has a tapered surface that is heated and melted into a tapered shape on the bent side of the side plate, and is connected to the tapered surface, and is connected to the side plate while the deployment plate is moving in the direction of the tapered surface. It is characterized by having a flat part for preheating the fusion end of the side plate part and for keeping the heated melting surface formed into a tapered shape warm while the developing plate moves in the mold direction, for keeping warm, and for guiding. Heating blade for manufacturing assembled containers.