JP2875496B2 - Equipment for manufacturing paper tray containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a dish-shaped paper container used for storing small quantities of food and beverages and for pouring and kneading pasty products.

[0002]

2. Description of the Related Art In order to store foods and beverages little by little, and to pour and cook a fluid such as jelly or bread dough,
Disposable containers such as aluminum foil and paper plates and cups are used. These are usually frusto-conical shapes that are open upward. Conventionally, cups and the like having a greater depth than the diameter have been manufactured by joining the body member and the bottom member, but the bonding of the joining portion is incomplete. The contents are oozing out or spilled from the gap, and the condition is bad.

[0003] Accordingly, the joint portion is formed by bending a single circular material while leaving a concentric circle in the center portion as a bottom portion and forming pleats (in this case, folds having a spreading angle in the height direction) in a peripheral portion. An attempt has been made to manufacture a container free of such a problem, and an example of the manufacturing method and apparatus is described in JP-A-3-111246. This will be described with reference to FIGS.

FIGS. 6A and 6B are conceptual diagrams showing a process of forming a paper container. FIG. 6A shows a sheet-shaped paper material W, and FIG. 6B shows a circular material D obtained by punching the sheet material. (C) is the first step, the central part
The periphery of 1a is bent to form an umbrella while forming pleats, and in the second step (d), it is further deep-drawn to a truncated cone shape, and slightly inside the outer peripheral edge 1c of the peripheral side surface 1b. To form a polygonal line 1d. Subsequently, as shown in (e), the outer portion from the polygonal line 1d is made cylindrical and then (f)
As shown in (1), the outer peripheral edge 1c is bent into an arc-shaped cross section to form a curled portion C, and the paper container 1 as shown in (g) is completed.

FIG. 7 is a front view showing a completed state. This paper container has a pleated portion P formed on the peripheral side surface 1b to give the container an expanded shape, and the rib effect of the pleated portion P improves the strength of the container. By wrapping the leading edge of the overlapping portion of P as a curled portion C, the pleats are prevented from spreading and trying to return to the original position due to the weight of the contents and the restoring force of the paper, and the edge of the container is rounded to provide food and drink. There is an advantage that safety during handling is improved. FIG. 8 shows a cross section of the outer peripheral portion near the curled portion C shown by B in FIG.

Conventionally, a paper container having such a curled portion has been divided into two steps of drawing and curling, but according to JP-A-3-111246, this is realized in one step. A method and an apparatus for manufacturing a paper-shaped cup have been proposed. FIG. 9 is a cross-sectional view showing a main part of an apparatus for manufacturing the paper container 1 described in Japanese Patent Application Laid-Open No. Hei 3-111246, in which 12 is a punch plate, 14 is a deep drawing punch, 19 is a paper pressing member, 31 is a curled pleat forming member, 35 is a paper holding cylinder, 36 is a deep drawing cylinder, each of the above members is attached to the upper die of the press machine, of which the curl pleat forming member 31 is the punch plate 12 and Although they move integrally, the paper pressing member 19 is mounted on the punch plate 12 via the paper pressing cylinder 35, and the deep drawing punch 14 is mounted on the punch plate 12 via the deep drawing cylinder 36. A unique movement added to the movement of is possible.

On the other hand, 21 is an inner die, 23 is an outer die, 25 is a rod, 26 is a die plate, 27 is a spring, 32 is a pleated forming movable member, 33 is a curl forming member, and 34 is a curling cylinder. Each member is attached to the lower die of the press, and the inner die 21 and the outer die 23 are integrated with the die plate 26.If this press is fixed to the lower die, the inner die 21 and the outer die 23 are Although not moving, the pleat forming movable member 32 moves up and down following the movement of the upper die via the rod 25, and the curl forming member 33 moves up and down independently by the curling cylinder.

The lower surface of the curl-pleat forming member 31 is a conical concave surface, and the upper surface of the pleat-forming movable member 32 is a conical convex surface. These cone angles are the same as those of the umbrella-shaped body shown in FIG. Equal to the cone angle. In addition, curled and pleated molded members
A saw-shaped cross section or a bevel gear-shaped pleat forming surface is formed on the lower surface of 31, and an annular groove for curling is formed on the inner edge thereof. An annular groove for curling is also formed on the upper surface of the lower curl forming member 33, and an annular space having a substantially circular cross section is formed in a state where the upper and lower annular grooves are in contact with each other.

The inner surface of the upper deep drawing punch 14 and the outer surface of the lower inner die 21 are tapered with a frustoconical cone angle shown in FIG. 6 (d). In addition, the upper curl
Lower edge outer edge of pleated member 31 and lower die outer die
The inner edge of the upper end of 23 has a sharp cutting edge. Although a detailed description with reference to the drawings is omitted, according to the above-mentioned Japanese Patent Application Laid-Open No. 3-111246, a sheet-like paper material W is first supplied to a press machine in accordance with the process shown in FIG. The lower die 19 presses the lower die, and the upper die starts lowering. First, a circular material D is punched by the above-mentioned cutting blade, and this is formed into a curl / pleat forming member 31 and a pleating forming movable member 32.
Fig. 6
The umbrella-shaped body shown in FIG. 6C is formed, and then the deep drawing punch 14 is lowered to the truncated cone shape shown in FIG. 6D, and the upper die is further lowered to curl the edge of the truncated cone shape. The inner surface of the pleated member 31 is pressed into a cylindrical shape. At this point, the lower curl forming member 33 is raised to drive the distal end portion of the cylindrical shape into the curl annular groove, as shown in FIG. Thus, the curl portion C is formed.

[0010] In this way, a cup or dish-shaped paper container having no joint can be manufactured in one process from a single circular material by a usual apparatus such as a press machine. Although there is no problem with a certain paper container, the manufacturing method still has the following problems. 1) In the step of forming the pleats, it is necessary to hold the deep drawing punch 14 down and hold an appropriate force to lock it for a certain time in order to prevent the deformation of the paper from being restored (see the above-mentioned publication, page 6, page 12). ~ Line 15). 2) For curl forming, it is necessary to provide a curl forming member 33 that can be raised and lowered in the lower mold portion. 3) That is, since movements other than the movement cycle of a normal press machine are required, the upper die is provided with a paper holding cylinder 35 and a deep drawing cylinder 36, and the lower die is provided with a curling cylinder 34, and these are appropriately mounted. Since the operation must be performed at an appropriate timing, the apparatus becomes complicated and defective products are easily generated.

[0011]

SUMMARY OF THE INVENTION The present invention solves such a problem and allows the operation time of a normal press to be maintained.
It is another object of the present invention to provide an apparatus for manufacturing a cup or a dish-shaped paper container having no joint without requiring any special operation other than lifting and lowering the upper mold.

[0012]

According to the present invention, a substantially circular paper material is used as a raw material, and a central portion of the outer periphery and a concentric circle are vertically sandwiched while forming a pleat around the central portion. processed further Oite the outer peripheral edges manufacture of dish-shaped paper containers to form a curled portion involving a predetermined amount,
Keeping the base paper at a high temperature, at least during deep drawing
It is an apparatus for manufacturing a paper dish-shaped container as described above.

[0013] Namely, the present invention is defined in claim 1, the punch plate flop <br/> less machine is attached a substantially cylindrical pressing hardware, like a punch plate of the press
In addition, a deep drawing punch with a tapered inner surface at the front end is inscribed in the holding member via a spring and is slidably attached.The die plate has a substantially solid cylindrical shape and the upper part corresponds to the deep drawing punch. An inner die having a tapered surface is mounted at the center, and a substantially cylindrical receiving member that is vertically movable and is urged in a rising direction by a spring is disposed outside the inner die , and further substantially outside the inner die. A paper made by attaching a cylindrical outer die, forming a radial pleat forming groove on the lower surface of the holding metal, and forming a curl forming annular groove having a substantially circular cross section on the upper inner edge of the receiving metal. This is a dish-shaped container manufacturing apparatus.

According to a second aspect of the present invention, there is provided a holding member,
2. The apparatus according to claim 1 , wherein at least one of the deep drawing punch, the inner die, the receiving metal, and the outer die is made of metal, and a heater is mounted on the metal.

[0015]

According to the present invention, the heaters for heating the upper mold and the lower mold are attached to the upper mold and the lower mold to form the paper material in a high-temperature environment. It is possible to carry out molding without restoration. Furthermore, repeated experiments were conducted on the configuration of the upper and lower dies, and the forming process was enabled within the motion cycle of a normal press machine only by using a spring without the need for an operating cylinder or the like.

[0016]

An embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 are sectional views showing an upper mold and a lower mold attached to a press machine, FIG. 1 shows a standby state, 11 is a shank,
Reference numeral 12 denotes a punch plate, 13 denotes a holding member, 14 denotes a deep drawing punch, 15 denotes an extruding member, 16 denotes a heater, 17, 18 and springs, and the above members are attached to an upper die of a press machine. Note that as the press machine in this embodiment, a normal crank press in which the upper die moves up and down and the lower die is fixed is used, but it is not necessary to limit to this as long as the upper and lower dies relatively move up and down. .

The holding member 13 is directly attached to the punch plate 12 and moves integrally therewith.
The deep drawing punch 14 having a tapered inner surface at the tip is connected to the holding metal via a spring 18.
Since it is inscribed and slidably attached to the punch plate 12, it can perform its own operation in addition to the movement of the punch plate 12. The heater 16 is a deep drawing punch 14
Is attached in close contact with the outer periphery of the device, and keeps it at a high temperature.

A pleat forming groove is formed on the lower surface of the holding hardware 13.
13a is formed radially and the corresponding deep drawing punch
A notch 14a for forming pleats is also provided at the lower edge portion of 14. On the other hand, 21 is the inner die, 22 is the receiving hardware,
23 is an outer die, 24 is a heater, 25 is a rod, 26 is a die plate, and 27 is a spring.These components are mounted on the lower die of the press, and the inner die 21 and the outer die 23 are directly on the die plate 26. Although it is attached and does not exercise,
The receiving hardware 22 disposed outside the inner die 21 is a rod 25,
Via a spring 27 is attached to the lower mold of the press machine, movable up and down to follow the movement of the upper mold, the spring 27
That it has been urged in the rising direction by.

An annular groove 22a for forming a curl having a circular cross section is provided at an inner end of the upper surface of the receiving metal member 22. Further, an outer edge of a lower end of the upper holding member 13 and an outer die 23 of the lower die are provided.
Has a sharp cutting edge at the upper edge. FIG. 2 shows a point in time when the upper die is lowered and the deep drawing punch 14 and the extruding member 15 are brought into close contact with the inner die 21 across the thickness of the material. Deep drawing punch 14 is held down by spring 18
Although it is pressed against the upper surface of 13, if the upper die further descends, the deep drawing punch 14 and the pushing member 15 cannot descend, so that only the holding metal 13 descends while pushing down the lower receiving metal 22.

FIG. 3 shows a state in which the upper die further descends to reach the bottom dead center of the press machine. Since the inner die 21 does not move, the deep drawing punch 14 and the pushing member 15 are stopped at the same height as in FIG. 2, and only the holding metal 13 and the lower receiving metal 22 are further lowered. The procedure for forming and processing a paper container with the upper and lower molds having such a configuration will be described with reference to FIGS. FIG. 4 shows a part of FIGS.
5 shows the change in the position of the upper die and the lower die for each step, and FIG. 5 shows the change in the shape of the material during this step.

First, in FIG. 4, (i) shows a sheet-like paper material W shown in FIG. 5 (a) fed into a press machine, and the upper die descends to lower the outer edge of the lower metal 13 and the outer die of the lower die. A circular material D shown in FIG.
Indicates a punched state. On the surface of the paper material W, a thin resin film or the like for preventing penetration of oil or water may be adhered, or a pattern or the like may be printed.

Subsequently, FIG. 4 (ii) shows the situation when the upper die is lowered to the state shown in FIG. That is, during this time, the central portion 1a of the punched circular material D is sandwiched from above and below by the extruding member 15 and the inner die 21, and the deep drawing punch 14 squeezes the surrounding portion downward, so that the circular material D The outer peripheral portion is drawn inward to form a conical peripheral side surface 1b. At this time, since grooves for pleat formation are formed radially on the lower surface of the presser fitting 13 and the lower end portion of the deep drawing punch 14 as described above, the material slides along this groove, and the peripheral side surface 1b Vertical pleats (wrinkles) are formed. The shape of the material at this time is shown in FIG.
It is shown in (c). By the way, in the present invention, since the upper die and the lower die are heated by the heaters 16 and 24, the deep drawing is performed in a high temperature state, so that the paper material softens and a kind of plastic deformation occurs, and the instantaneous processing is performed. Is maintained.

Further, when the upper die is lowered to the bottom dead center as shown in FIG. 3, the entire outer peripheral portion in the horizontal direction is retracted as shown in FIG. Stick to the cylindrical part. The shape of the material at this time is shown in FIG.
(D). After the bottom dead center, the upper model starts to rise.
Since the intermediate paper material is gone, the lower end of the holding metal 13 and the upper part of the receiving metal 22 are in close contact with each other by the spring 27,
Since there is no room for the lower end of the paper material to enter between the lower end of the presser fitting 13 and the upper part of the outer die 23, the lower end of the paper material enters the curl forming annular groove 22a formed at the inner end of the upper surface of the receiving fixture 22, The curled portion C is formed by being rounded. This state is shown in FIG.
5 (e) in FIG. 5 and FIG. 5 (e). When the upper mold further rises, the paper container 1 formed as shown in FIG. 4 (v) is separated from the inner die 21, further separated from the upper mold by the pushing member 15 by the spring 17 and discharged from the press. Since the above-described cycle is performed without any stop in the middle, high-efficiency production of 40 to 60 cycles per minute is possible.

Here, the amount of winding in the curl portion C is determined by the amount of rise from the position of the bottom dead center shown in FIG. 3 until the upper and lower dies shown in FIG. 2 are separated. As the number of turns that can be stored and exhibit the effect of the above-described curled portion, about 1.5 to 2.5 turns is appropriate. Although the pleat forming groove 13a is formed on the lower surface of the presser fitting 13, a protrusion may be formed on the upper surface of the receiving metal correspondingly, or the upper and lower grooves and the protrusion may be reversed. .

Although the above description has been made with reference to the case of a container having a circular planar shape, the present invention can be applied to a quadrilateral or a triangular having an R at a corner. Shapes, “substantially cylindrical shapes”, “concentric circles”, “substantially conical shapes” and the like include these. In addition, if a material punched into a substantially circular shape can be prepared in advance, the processing may be started from FIG. 5B.

Since the upper and lower molds are usually made of metal and have good heat conduction, it goes without saying that the mounting positions of the heaters 16 and 24 are not limited to the above-described embodiment.

[0027]

According to the present invention, it is possible to manufacture a paper container without adding a cylinder or the like to a normal press machine and without stopping a normal cycle, and productivity is remarkably improved. In addition to this, an excellent effect is obtained in that excellent quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an upper die and a lower die according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an upper die and a lower die according to the embodiment of the present invention.

FIG. 3 is a sectional view showing an upper die and a lower die according to the embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing an operation corresponding to the movement of FIG.

FIG. 5 is a conceptual diagram showing a shape change of a material in an example of the present invention.

FIG. 6 is a conceptual diagram showing a shape change of a material in a conventional technique.

FIG. 7 is a front view showing the shape of a product according to a conventional technique.

FIG. 8 is a partial sectional view showing a portion B in FIG. 7;

FIG. 9 is a cross-sectional view showing an upper die and a lower die according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper container 1a Central part 1b Peripheral side surface 1c Peripheral edge 1d Polygonal line 11 Shank 12 Punch plate 13 Holder 13a Pleat forming groove 14 Deep drawing punch 14a Pleat forming notch 15 Extruding member 16 Heater 17, 18 Spring 19 Paper Pressing member 21 Inner dice 22 Receiving hardware 22a Circular forming annular groove 23 Outer dice 24 Heater 25 Rod 26 Dice plate 27 Spring 31 Curl / pleat forming member 32 Pleat forming movable member 33 Curl forming member 34 Curl cylinder 35 Paper holding cylinder 36 Cylinder for deep drawing C Curl section D Material P Pleated section W Paper material

Claims (2)

(57) [Claims] The punch plate 1. A flop less (12), is attached a substantially cylindrical pressing hardware (13), the same
A deep drawing punch (14) with a tapered tip inside is inscribed in the presser (13) via a spring (18) and slidably attached to the punch plate (12) of the press machine. In (26), an inner die (21) having a substantially solid cylindrical shape and an upper portion having a tapered surface corresponding to the deep drawing punch (14) is attached at the center, and this inner die (21)
Of the outer, movable up and down, rise direction by a spring (27)
A substantially cylindrical receiving metal (22) urged in the direction is disposed, and further, a substantially cylindrical outer die (2
3), a radial pleat forming groove (13a) is formed on the lower surface of the presser fitting (13), and a curl forming annular groove (having a substantially circular cross section) is formed on the inner edge of the upper surface of the receiving metal (22). An apparatus for manufacturing a paper dish-shaped container formed by 22a). 2. A holding metal (13) and a deep drawing punch (1).
4), inner die (21), receiving hardware (22), outer die (2
At least one of 3) is made of metal, and heater (1
The apparatus for producing a paper dish-shaped container according to claim 1 , wherein the apparatus is equipped with (6, 24).