JPS5814733A - Method of assembling bottom of paper vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Regarding the method.

Figure 1 shows a general paper container QOI, and the bottom part of the container is folded as shown in Figure 1. It is assembled by flattening it into a flat shape and gluing each wall.The adhesion is achieved by heating and melting a heat-sealing adhesive layer (for example, polyethylene resin) that has been applied to the inner and outer surfaces of the paper gB in advance. Ru.

To describe the assembly of the bottom of the paper container in detail, the paper container with the tube attached is inserted into a turret-like mandrel and rotated intermittently, and at each stop position the bottom of the paper container is heated, folded, and folded. This is done by sequentially performing each pressure step. The adhesive melted in the heating step is pressed by the folding and pressing step, flows to the stepped portion of the paper, and solidifies as it cools.

However, conventional pressure bonding may not provide sufficient sealing performance, and leakage may occur when filled with liquid. This occurred noticeably in winter. Therefore, when the temperature of the heater was increased in the above-mentioned heating step, it was not possible to obtain sufficient results, but the quality of the adhesive was changed, and the sealing properties were rather deteriorated.

The present invention has been made in view of this point, and provides a method that can obtain good sealing performance without increasing the heating temperature in the conventional heating process.

Embodiments of the present invention will be described below based on the drawings.

3 and M41 are apparatuses for carrying out the method according to the invention. In the figure, the α barrel is a paper container supply unit in which a large number of paper containers that are pasted into tubes and folded flat are stacked. The flat paper container is taken out one by one from the cage ea by suction on one side of the peripheral wall with a suction cup (two strokes), and while being taken out, the adjacent surface of the fixing member (not shown) is pushed away and becomes square. It is raised up into a cylindrical shape and brought onto the supply table.

Next, the paper container is pushed out toward the mandrel (3) and inserted into it by a member (1) that reciprocates along the guide (3).

In this case, the mandrels (321 are vertical turrets, and two sets of turrets rotate the rotation of the shaft intermittently.Then, the - set of turrets) KIriA number of mandrels are provided. Therefore, the six stop positions are the supply section O8, the first heater (3 and the second heater (to), between the folding devices, and the folding pressurizing device (4Q).
1 discharge devices (421) are installed sequentially in the rotation direction.

However, when the paper container is inserted into the mandrel 02 as shown in FIG. After the two heaters (to) are melted well and the folds are applied by the folding device (c) as shown in Fig. 2, the mandrel r33
Pressure is applied toward the surface and the material is bonded.

Here, in order to prevent the occurrence of seal defects as described above,
A second heat retention device is provided between the second heater (3fli) and the folding device (to), and a second heat retention device (to) is provided between the folding device (to) and the folding pressurizing device (to 4G). 46).As shown in the enlarged view in FIGS. A heater is installed along the line.

As shown in Figure 6, the heater is provided along the center of the bottom αa, and this heats the adhesive on the inner surface of the bottom where good adhesion is often desired. The device (4e) also moves the cover 6 along the travel trajectory α at the bottom of the paper container, as shown in FIGS.
3, but the cover is equipped with a guide 154) for folding the bottom part which has been curled by the curling device as shown in Fig. 7, and a heater j is installed near the top of the geometric folding pressurizing device. We are prepared. This heater heats and keeps warm the largest number of paper layers on the inner surface of the bottom of the paper container. The most layered part is, for example, the broken line Csga in Figure 1.
sg b), especially when these fold lines are adjacent to each other, it is difficult for the adhesive to flow here, and this is where the most attention should be paid to sealing 1.

The heater HK maintains the molten state of the adhesive in the most layered portion well, and allows processing to be carried out using the folding and pressurizing device. In addition, the ambient temperature used by the heater (to) is as follows:
For example, the temperature is 30°C to θ°C.

The bottom part a3 is folded and the good paper container Ql is then taken out from the mandrel by the discharge device 0 and then transferred to the lower conveyor 2. The ejection device is equipped with a -41 clamp and descends holding the container aω on the mandrel in its mouth, then rotates horizontally qd', another presser (not shown) descends toward the ejection device, and the receiver is placed on the mandrel. Insert it into the The conveyor (the conveyor) moves intermittently to the left and sends the containers to the next post-processing process such as filling and sealing.

As described above, the present invention not only performs heating at the conventional intermittent running stop position, but also performs heating over the entire length between the heating process and the folding process, and between the folding process and the folding pressurizing process. Since the inner surface of the bottom of the container and the thickest layer are heated and kept warm at each press time, the fluidity of the heat sealing adhesive when the bottom of the paper container is folded can be improved, and the bottom of the container can be sealed. You can increase your sexuality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a paper container. FIG. 1 is a perspective view of the bottom of the paper container in a folded state. Figure 3 is a schematic plan view of the assembly device for the bottom of the paper container, erg.
FIG. 3 is a schematic front view of Fi. FIG. 1 is a front view of a first heat retention device for carrying out the method according to the present invention, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 1, and FIG. 7 is a front view of a second heat retention device. FIG. 7 is a sectional view taken along the line Vlll-Vll in FIG. 7. = 7- Fang 1 figure 8 figure 119b 4 K Fang e figure Mumu Fang 5 figure crystal off figure ■--' 52

Claims (1)

[Claims] A cylindrical paper container with a heat-sealable adhesive layer provided on its inner and outer surfaces is inserted into a turret-like mandrel and rotated intermittently, and at each stop position the bottom of the paper container is heated;
In the case where the bottom is assembled by sequentially performing the folding and folding and pressing steps, the heat-sealable adhesive layer on the inner surface of the bottom of the paper container is mainly heated over the entire length between the heating step and the folding step. 1. A method for assembling a bottom of a paper container, the method comprising: heating the shoulder portion of the paper layer on the inner surface of the bottom of the paper container to keep it warm between the folding step and the folding and pressurizing step.