JP2002001840A - Apparatus for shaping paper-made tray - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for shaping for inexpensively feeding a tray made of a non-drawing paper. SOLUTION: A heating plate 20 arranged in an upper box 13 and a piston rod 22 of an air cylinder 21 fixed on the upper box are freely removably connected. On the other hand, a shaping mold 26 arranged in the lower box 14 is provided with a recessed part 27 and the recessed part 27 is formed by being surrounded by continuous bank bodies 28 and the plane shapes of each of these continuous bank bodies 28 have the same shapes as the contours of press edges 29 hanging from the peripheral edges of the heating plates. When both the upper and lower boxes pinch a composite paper sheet material 10, air in both the upper and lower spaces 17 and 18 is sucked through two rubber hoses 31 and 32 to change it to vacuum and when the composite paper sheet material is pressed on the continuous bank bodies by means of the press edges by successively lowering the piston rod, the composite paper sheet material is pushed into the recessed part of the shaping mold and is shaped by air pressure working in a region surrounded by means of the press edges through a hollow part of the piston rod from a tube 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper tray shaping apparatus for containing and packaging, for example, food.

[0002]

A plastic tray mainly for storing foods is provided by vacuum suction of a heated thermoplastic synthetic resin plate into a concave portion of a mold or addition of a melting plastic material into a shaping mold. It is formed by pressure injection. However, this kind of tray is likely to impair the upgrading of food due to the mineral aspect of plastic. Statistically, food trays are preferably made of plant material, and paper is the one that can best meet the requirements of this type of tray, but paperboard is easily broken by processing stress, and such processing mistakes,
Due to the work to smooth the wrinkles generated at the four corners of the tray during drawing, the processing cost tends to be high,
It has not been distributed as a general food container.

[0003]

According to the present invention, in order to supply a paper tray at a low cost, a composite paper board material made of a paper sheet and a thermoplastic synthetic resin film is changed to a vacuum environment, respectively. Upper and lower boxes sandwiched from above and below and forming the sealed upper and lower spaces, a heating plate arranged to heat the composite paper board in the upper box, and a heating plate for displacing the heating plate in the vertical direction. A pressurizing means installed on the upper portion of the heating plate, a shaping type including a continuous embankment body having the same shape as the pressurizing edge hanging down from the heating plate and arranged in the lower box; Means for injecting air pressure into a region surrounded by the pressing edge of the composite paper board to be pressed, wherein the shaping type includes a shaping recess of an allowable depth inside a continuous embankment, and the heating plate is provided to the pressing means. ,
Further, the shaping mold is configured to be exchangeable with the lower box.

When an upper box and a lower box sandwich a composite paper board made of a paper sheet and a thermoplastic synthetic resin film, the space inside each of the two boxes changes to a vacuum environment due to air suction. At the same time, the composite paper board receives heat from the heating plate in the upper box, and the pressing means descends the heating plate to clamp the composite paper board with the shaping mold. The shaping type includes a shaping recess of an allowable depth inside the continuous embankment body, while the shaping type arranged in the lower box includes a continuous embankment body having the same shape as the pressing edge hanging from the heating plate and continuously. Since a shaping recess having an allowable depth is provided inside the embankment body, the composite paper board forms a tray along the shaping recess with a differential pressure as a result of introducing air pressure into a region surrounded by the pressing edge.

[0005] Before forming the tray, the composite paper board is preheated. However, since the heat capacity of the paper sheet is small and the heat capacity of the thermoplastic synthetic resin is large compared to that, the paper sheet is made of the thermoplastic synthetic resin. To increase the heat capacity of the entire board. By the instantaneous pressure difference formation, the thermoplastic synthetic resin having excellent stretchability is stretched, and at the same time, the stretching of the paper sheet is also assisted to form a tray. In other words, in this case, the thermoplastic synthetic resin exerts an assisting force due to its viscosity against the force of tearing the local portion of the paper sheet, and disperses the local stretching of the paper sheet more widely to shape the tray. Therefore, it is desirable that the weight ratio of the thermoplastic synthetic resin in the composite paper board is as high as possible, if possible, as a whole as paper. In the shaping, the heating plate can be exchanged for the pressurizing means and the shaping mold can be exchanged for the lower box. Therefore, it is possible to quickly respond to a change in tray shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a strip-shaped composite paper board 10 placed on two parallel idler shafts 11 is shown in FIG.
Of the pair of endless chains 12 on both sides, and is intermittently sent out between the upper box 13 and the lower box 14 by the rotational power of the chain 12.

[0007] As shown in FIG.
However, since the guiding force of the groove cam is applied to the rod 16 connected to the upper box 13, the upper box 13, which is usually separated from the lower box 14, descends toward the lower box 14 in a certain cycle. At this time, while holding the composite paper board 10,
Sealed spaces 17 above and below the composite paper board 10 respectively, 17,
18 are formed.

In the upper box 13, six heating plates 20 arranged in two rows and three columns, and the same number of piston rods 22 of air cylinders 21 fixed on the upper box are detachably connected. The mechanism for such attachment and detachment includes the rod 22
The ring nut 23 rotatably supported on the heating plate 20
An example in which the screw holes 24 are screwed into the center screw holes 24 and connected are employed. As such pressing means, that is, pressing means for pressing down the heating plate 20 downward to press the composite paper board 10, for example, suspending the heating plate 20 to the upper box 13 via a flexible bag 25. The heating plate 20 is pulled up by evacuating the bag 25, and the heating plate 2 is
It is also possible to adopt a structure that allows 0 to move.

On the other hand, the shaping mold 26 disposed in the lower box 14 also has six recesses 27, each recess 27 being formed by surrounding a continuous embankment 28, and the planar shape of each continuous embankment 28. Has the same shape as the contour of the pressing edge 29 hanging down from the peripheral edge of the heating plate 20. Moreover, the shaping mold 14 is removably mounted on a mounting frame 30 disposed in the lower box 14.

The composite paper board 10 used as shown in FIG.
It is optional whether the illustrated paper sheet 50 is used on the lower side or on the upper side with a polymer material obtained by laminating a thermoplastic synthetic resin 51 such as unstretched polypropylene.

As shown in FIG. 1, when the upper and lower boxes 13 and 14 hold the composite paper board material 10, the air in the upper and lower spaces 17 and 18 is sucked through two rubber hoses 31 and 32 to change the vacuum to a vacuum. When the pressing edge 29 presses the composite paper board 10 against the continuous embankment body 28 by descending,
From the tube 33 through the hollow part of the piston rod 22, the composite paper board 10 is pushed into the shaped recess 27 by air pressure acting on the area surrounded by the pressure edge 29.

As shown in FIG. 5, when a pressure difference is generated between the upper and lower chambers 17a and 18b, the heated composite paper board material 10 expands spherically downward.
The landing area is expanded radially and shaped into 27 different concave shapes. In FIG. 4, the paper sheet 50 has a small heat absorption capacity and the thermoplastic synthetic resin 51 has a large heat absorption capacity, so that the paper sheet 50 receives the heat capacity of the thermoplastic synthetic resin 51 and receives the heat capacity of the entire paper board. Up. By the instantaneous pressure difference formation, the thermoplastic synthetic resin 51 having excellent stretchability is stretched, and at the same time, the stretching of the paper sheet 50 is also assisted to form a tray. That is, the thermoplastic synthetic resin 51 exerts an assisting force due to its viscosity against the force of tearing the local portion of the paper sheet 50.

As shown in FIG. 5, when the shaping die 26 is used in which the corner shape of the concave portion 27 is formed into a spherical shape 52, the shaping shape of the tray can be made arbitrary by adjusting the processing of the spherical shape 52. Although having the advantage, the paper mold may wrinkle at the corners of the tray, as the shaped mold 26 will impede the natural stretching action of the composite paper board 10. In this regard, when the shaping mold 26 in which the corner of the concave portion 27 is deeply stolen as shown in FIG. 6 is used, the composite paper board 10 is finished in a natural shape by the pressing force P. However, in the embodiment of FIG. 6, the depth of the shaped recess 27, that is, the depth 55, is greater than that of the embodiment of FIG.
It is necessary to set it within an allowable value corresponding to a durability value of 0. Therefore, according to the change of the heater temperature in the heating plate 20, the surrounding environmental temperature, the material of the composite paper board material 10, etc.
The permissible depth 55 is changed by adding or deleting.

The shape of the tray to be shaped is changed by replacing the heating plate 20 and the shaping mold 26 in FIG. Further, when moisture is added to the paper sheet of the composite paper board 10 by the humidifier 57 installed at the entrance of the box 13 as shown in FIG. 2, the stretching of the composite paper board can be further promoted. When the continuous tray 58 formed inside the box 13 receives the replenishment of the packaged objects 59 in the region carried out of the box 13 and further carries it into the subsequent vacuum chamber 60, the continuous tray 58 is placed in advance in the vacuum atmosphere of the chamber. It is sealed by a cover film 61 put on the upper part,
Become a vacuum packaging product.

In the embodiment shown in FIG. 7, the upper and lower boxes 65 and 66 are relatively opened and closed vertically and closed to clamp the composite paper board 67. A heating plate 69 fixed to the lower opening surface of the upper box 65 by screws 68 includes a plurality of rows of heater wires 70 and ventilation holes 71 penetrating vertically. On the other hand, a shaping mold 73 is mounted on an air bag 72 installed inside the lower box 66, and the shaping mold 73 forms a concave portion 75 surrounded by a dike 74 on the upper surface as shown in FIG. The shaping mold 73 is detachable in the upper direction of the lower box 66, and six pieces 76 protruding from the periphery contact the inner wall 77 of the lower box 66 to perform positioning.

In the above embodiment, first, air is sucked from the upper and lower boxes 65 and 67 through two upper and lower rubber hoses 78 and 79. In the upper box 65, a vacuum is applied to the upper surface of the composite paper board 67 through the ventilation hole 71, while in the lower box 66, the vacuum is applied through the groove 78 in the lower center of the shaped mold 73.
, And further into the recess 75 through the passage 79.
Thereafter, the air bag 72 is inflated by the air pressure sent from the pipe 80, and the upper paper hose 67 is pressed while the composite paper board 67 is sandwiched between the shaped embankment 74 raised by the pressurizing means 72 and the heating plate 69. When the atmospheric pressure is applied to the upper surface of the composite paper board 67 through the ventilation holes 71 with the priority of 78, the atmospheric pressure pushes the composite paper board 67 into the shaped concave portion 75 and shapes it.

[Brief description of the drawings]

1 is a sectional view of a shaping box, taken along the line II in FIG. 2;
Arrow cross section

FIG. 2 is a side view of the entire apparatus.

FIG. 3 is a partial plan view of the previous figure.

FIG. 4 is a cross-sectional view of a composite paper board material.

FIG. 5 is an explanatory diagram of tray shaping.

FIG. 6 is an explanatory view of tray shaping.

FIG. 7 is a sectional view of another embodiment of a shaping box.

FIG. 8 is a plan view of the lower box in the preceding figure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Composite paper board material 13 ... Upper box 14 ... Lower box 16 ... Rod 17 ... Upper space 18 ... Lower space 20 ... Heating plate 21 ... Pressurizing means 23 ... Ring nut 24 ... Screw hole 25 ... Pressing means 26 ... Shaped type 27 ... recessed part 28 ... continuous embankment body 29 ... pressure edge 30 ... mounting frame 31, 32 ... rubber hose for vacuum 33 ... means for sending air 50 ... paper sheet 51 ... thermoplastic synthetic resin film 55 ... allowable depth 56 ... depth change Plate 57 ... Humidifier for forming high humidity area 58 ... Tray 59 ... Packed object 60 ... Vacuum chamber 61 ... Cover film 65 ... Upper box 66 ... Lower box 67 ... Composite paper board 69 ... Heat plate 71 ... Vent hole 72 ... Pressurizing means 73 ... Shape type 74 ... Continuous embankment body 75 ... Recess 76

Claims (4)

[Claims] 1. An upper and lower box for sandwiching a composite paper board between a paper sheet and a thermoplastic synthetic resin film in a vacuum environment, respectively, in order to change the upper and lower spaces of the composite paper board relative to each other from above and below, and the upper box. A heating plate arranged to heat the composite paperboard in the heating plate, a pressing means installed on the heating plate to displace the heating plate in the vertical direction, and a pressing edge hanging from the heating plate and having the same shape. A continuous embankment body and a shaping type arranged in the lower box, and means for inviting air pressure to a region surrounded by the pressing edge in the composite paper board material sandwiched between the heating plate and the shaping type, An apparatus in which the shaping type is provided with a shaping recess of an allowable depth inside a continuous embankment body, and the heating plate is replaceable with the pressurizing means, and the shaping type is replaceable with the lower box. 2. An upper and lower box for holding said composite paper board relatively close to each other from above and below to change the upper and lower spaces of the composite paper board of a paper sheet and a thermoplastic synthetic resin film into a vacuum environment. A heating plate arranged to heat the composite paperboard material therein, a shaping type including a continuous embankment body having the same shape as the tray plan shape to be formed, and a shaping type arranged in the lower box, and the shaping type in a vertical direction. Pressing means for displacing, and means for inviting air pressure to the upper surface of the composite paper board material sandwiched between the heating plate and the shaping type, the shaping type includes a shaping recess of an allowable depth inside the continuous embankment, An apparatus in which at least the shaping type is exchangeable with the lower box. 3. The apparatus according to claim 1, wherein the allowable depth of the shaping recess is adjusted by adjusting the thickness of a plate added to the shaping recess inside the continuous embankment body in the shaping type. 4. The apparatus according to claim 1, wherein a belt-shaped composite paper board made of a paper sheet and a thermoplastic synthetic resin film is supplied to the upper and lower boxes through a high humidity region.