JPS602432A - 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 The present invention relates to a paper container, and in particular, it is an inexpensive and high-performance paper container characterized by forming a synthetic resin coating 7 that is densely layered on the surface of a paper base material and has no holes or breaks. It is related to paper containers.

It has come to be used in extremely large numbers for tribute goods. 71) However, it is impossible to use this container as a container for storing liquids for a long period of time for reasons detailed below.

In other words, this type of paper cup usually has wax or synthetic resin impregnated on the surface of the paper, which would be profitable, which defeats the purpose of using it as an instant container. When using (1. Leakage that occurs throughout the paper l1lllI wall joint A and from the lamination to the paper cup? Lamination during manufacturing)
Cracks occur in the laminate layer at the periphery 13 of the laminate layer and the -L edge C, where bending occurs in the synthetic wood J-thin coating. It becomes impossible to use it as a full liquid storage container.

This is further explained in all the drawings.
lk is an enlarged horizontal cross-sectional view of part A of the XVI-xvt line cross section in FIG. 15 of 1 force, which is a cross-sectional view of the cup This is what is shown.

In FIG. 16, the circular surface of the paper base material 1 is laminated with a synthetic resin layer 2, and the inner surface of the paper base material 3 is laminated with a synthetic resin layer 4.
is laminated, and this is joined by the adhesive layer 20 to form the side wall joint of the paper container, but in a normal paper cup made of laminated paper with such a side wall vertical joint, Regarding the direction shown by arrow 5, the laminate layer cannot fully exhibit its waterproof effect, so leakage as shown by arrow 5 occurs.
This makes it impossible to use paper cups as containers for long-term storage liquids. One way to prevent this leakage is to spray wax on the exposed paper part of the paper cup to seal it, which is effective if the 2'L is made of laminate or wax. However, such containers cannot be used for high temperature applications and are easy to peel off mechanically.

The purpose of the sole is extremely limited σf+.Also, there is a way to achieve the purpose of the sole by applying synthetic resin mixed with bath salts to this part. IIT is an adhesive that does not dissolve at all in ordinary solvents and exhibits good adhesion to polyolefins. Therefore, if all polyolefins are used as a laminate material, it is impossible to apply all of these methods, and for this reason, this method is also extremely limited in terms of quantity. Therefore, there is a method for preventing leakage as shown by arrow 5 in FIG. 16 in a polyolefin-based resin fully laminated L7v paper cup.

This is the first reason why, in a practical sense, the cupcakes made by assembling laminated paper can only be used as containers for long-term storage.

17 is a vertical cross-sectional view of the peripheral edge joint B of the bottom body in FIG.
It is extremely difficult to complete the sole at the joint between the laminate layers 13 and 14, and leakage as shown by arrow 15 and 7 occurs from this joint, and leakage as shown by arrow 16 occurs from this joint. also occurs. Furthermore, since the paper substrate 12 is bent at a significant acute angle for bonding at this portion, defects occur in the laminate layer 14 at this bent portion, which usually causes leakage as shown by arrow 17. .

Leakage due to defects in the laminate layer due to bending of similar magnitude also occurs in the directions of arrows 18 and 19. This is the second reason why paper cups manufactured by assembling laminated paper bases cannot be used as paper containers for storing liquids for long-term use. Next, FIG. 18 is an enlarged view of the upper edge C of the paper cup shown in FIG. When using a paper container as a paper container, it is usually laminated with a lid made of aluminum foil, etc. as shown in 8. Is it normal to seal the two wires, in this case, Hd is formed at the upper edge of this
During manufacture of the recessed portion 17I, defects tend to occur in the laminate layer, and if liquid is spilled into this container and the container falls over, leakage as shown by arrows 9 and 10 will occur. Is it possible to use a paper cup assembled with laminated paper as a paper container? Part 3
This is the reason for the inspection.

The purpose of this invention is to improve the drawbacks of the conventional paper cup detailed above and to accommodate liquid for a long period of time. The present invention relates to a method and apparatus for industrially manufacturing new paper containers. That is, in more detail, n is a paper cup produced by the method and apparatus for producing a paper cup according to the present invention.
If you look at it clearly, it is a paper container that looks like a woman as shown in FIG. 10, and FIGS. 2
1 and the structure of the bottom body peripheral line bent portion 24.

That is, the paper container according to the present invention has a capacity of at least 1 m1.
1III is applied to the synthetic resin coating and laminated to the σnR paper base to form the chipped side wall 2o and the bottom body 23 (il).
- As shown in Fig. 10, the side wall hanging part 1 and the joint part 21 have a substantially constant width, forming a series of structures, and the laminated layer 1 on the inner surface of the side wall. The anti-sole parts 22, 22' and the bottom peripheral bent part 24, which are integrally formed on the inner surface of the sole part 22 and the sole part 2, are in close contact with each other.
5, 25' and upper edge/ru portions 27, 27' that continuously cover the surface of the two-sided hPh curved portion 26. Details of the structure of the structure 1 are shown in Fig. 11 and Fig. 1.
As shown in FIGS. 2 and 13, for the upper edge of FIG. 7 layers 27, 27' are present, and at 11111 wall vertical joints 21 in FIG. 12, paper substrate 20a.

The laminate layer 20b, 2 is formed on the inner surface of the layer 20'a.
0'b, and the paper base inward laminate layers 20b and 20'b on both sides of the 1i11 wall-to-vehicle surface joint 21 are connected and sealed to the entire series 22 and 22'. I'm n.

As is clear from FIG. 13, the bottom body peripheral bent portion 24
G n is formed on the inner surface of the paper base 20a that forms the side wall.
A bottom periphery is formed on the inner surface of the paper base 23a formed with the 7'v laminated wing layer 20b and the bottom body 23a, and the bottom laminate layer 23b is fully adhered to and integrally connected and sealed with the bottom body laminate layer 23b. In Figure 12 Vc, a paper base having a laminate layer of one synthetic position in at least the inner m1 formed mainly in the paper container. As explained in detail in February 20a, it is easy to maintain sufficient iI liquid properties for the purpose of use in ordinary powder containers, except for side wall joints and acid body periphery bend H1. Yes 5 By using the equipment and method according to the present invention, a sole layer is formed on the vertical joints of the side walls and the bent portions of the peripheral edge of the bottom body as shown in FIG. It becomes possible to use it as a container.

The purpose of the present invention is to provide a method and apparatus for manufacturing a paper container, which will be explained in detail with reference to FIGS. 10, 11, 12, and 13. It is.

The present invention has the structure as described in detail above.
A laminate layer formed on the inner cylinder of the paper cup at each predetermined part of the paper cup that requires the formation of a single layer, and adhesive or heat fusion with the powder of the PI pole or the synthetic resin forming the laminate layer. A method whose main point is to form a powder layer by electrostatically applying a resin powder having a viscosity, and then heating this layer to form a sealing layer that is integrated with the circular laminate layer of the paper cup. It is related to the device.

The details of this specific method and apparatus will be explained next with reference to an example. Figure 1 shows a paper cup assembled with laminated paper using one of the methods and apparatus for manufacturing a paper container according to the present invention. Fig. 2 shows a vertical cross-sectional view showing the state in the middle of forming a charged powder layer on a circular surface, and Fig. 2 shows a horizontal cross-sectional view taken along the line II-11 in Fig. 1. The figure shows the trajectory of the movement of the tip of the powder discharge port in Figures 1 and 2. In Figure 1, t(11 pieces 51
20 and the bottom body 23 form a NFV paper cup (
In the following description, a cup made by assembling 42 paper threads such that a laminate layer is formed on the inner surface of the cup using at least laminated paper will be collectively referred to as a paper cup. shall be taken as a thing. ) As shown in FIG. The outer 11111 electrode 28 is connected to the vertical joint part 21 of the paper cup, and a narrow plate-like joint part outer electrode 29 is placed on the outside of the vertical joint part 21 of the paper cup at a closeness f, and furthermore, the paper cup σ) The outer electrode 47 is on the 1 side.
They are arranged in such a way as to encircle the shields, and are connected in a series so that the potential of the poles is maintained at ground potential.

The reference numeral 40 denotes a joined body consisting of an R-shaped continuous wire element that mechanically connects these electrodes to each other and ensures a relative relationship with the paper cup. On the other hand, in the circle of the paper cup (ii), the masking parts 38 and 39 are in contact with the parts that do not require the formation of the sole layer, and 45 and 44 are supporting devices for these masking parts. Inside, a pipe-shaped powder feeding device 30 is disposed as shown in the figure, and this pipe is provided with a small amount of entraining gas as shown by arrow 36 to form a powder on the inner surface of the paper cup. The same powder as the laminate layer, or at least powder of a resin that has adhesive or heat-sealing properties with the synthetic resin forming the laminate layer, is injected and formed so as to eject from the source 711. In this case, it is preferable that the powder feeding device 30 usually has a circular surface having a function of completely preventing the adhesion of powder by an electrodynamic method or device, and for this purpose, the first In the example shown in the figure, the powder feeding device is composed of 30 resuscitable materials, and spiral electrodes 32 and 33, which are insulated from each other, are arranged in parallel on the circular surface of the two electrodes. In between, a current voltage of approximately commercial frequency is applied by the current voltage applying means 34, and due to the repulsive force due to the cross unequal electric field generated between the two electrodes, At the same time, the tip of the powder feeding device 30 is prevented from accumulating on the inner surface of the powder feeding device 30, and at the same time, the dispersion of the auxiliary air used for feeding the entire powder shown by the arrow 36 is kept extremely small. '' to keep the velocity of the ejected particles and gas low.
3, and a needle-shaped corona modified electrode 31 is arranged;
Voltage is applied by the DC power supply 35 to the electrodes 28, 29, 29, and 47, and a slight corona discharge is generated at the tip of the electrode 31 at the position of the corona discharge electrode. 31 A" passed near 4 and powder feeding device 30
σ) The powder ejected from the tip is definitely charged, and passes through the first layer of Lamiho that exists on the surface of the paper cup, and then the paper base is separated from the other side. Powder particles ejected from the tip of the powder feeding device 30 are driven toward the surface of the laminate layer of the paper container by attaching a white blade to the grounded outer electrode 28. 1 TII, an electric field is formed so as to finally form a charged powder layer 37 on the surface of the laminate layer. On the other hand, the tip of the powder feeding device 3o is caught in a handling device not shown in the figure, and the tip of the powder feeding device 3o is connected to a charged powder layer 37 on the inner surface of the paper cup.
It is driven to make at least one round movement along the area to be coated so as to keep the relative accuracy with the area to be coated almost constant.

An example of this driving situation is the sequence and route shown in FIG. 3, for example. That is, the tip of the powder feeding device 3o moves along one side of the vertical joint 21 of the side wall at arrow 48 to form the sole portion 22, and then bends the peripheral edge of the bottom body of the paper cup as shown by arrow 49 to form an annular shape. Part 24
The tip of the powder feeding device 3o moves along the sole portion 2.
5′? Then, as shown by the arrow 50, a sole part 22' is formed which descends along the other side of the vertical joint of the side wall of the paper cup and continues to the sole part 25, and then a horizontal annular 4 is formed as shown by the arrow 51. The tip of the powder feeding device 30 moves along the upper edge bend 26 and reaches the arrow 52 to complete one round of movement, during which time the formation of a charged powder layer is desired. Powder feeding device 3 along Q t7-+
5. Discharge the amount of powder or σ stone necessary to form the desired powder layer 37. In addition, the powder feeding device f, which moves along the path 1-1 shown in FIG. A small corona discharge continues toward the affected area.

This makes it possible to form a continuous powder layer. In addition, when painting near the upper edge bent part 26 of the paper cup, it is necessary to form a powder layer on both the outer side and the "IT+row J1", so an auxiliary electrode 4] is provided and Apply an electrode of the same polarity as the corona discharge electrode (35) to -2 to form an electric field, and at the same time take the outside 11111 to the duct 42 at an appropriate speed as shown by arrows 1-43. By eliminating the intake air, it is possible to improve the efficiency of coating and form an appropriate amount of powder layer on the inner and outer surfaces of the upper edge bend Hlt 26. In this case, when coating 7a on the upper edge bent portion 26, the paper 0] If the electrical resistance is extremely high, 17
Since there are cases where the efficiency of coating is low, in such cases, it may be possible to obtain good results by appropriately adjusting the humidity of the paper and lowering the electrical resistance of the paper. n
It goes without saying that the same method can be applied to other sites under similar conditions. In this method, the ejection of the entraining gas at the tip of the powder feeding device 30 makes it possible to carry out the coating with high efficiency due to the small distance, which is therefore important for obtaining a high production rate. To achieve this purpose, a means for electrodynamically preventing powder from adhering to the inner surface of the feeding device as shown in this embodiment is applied to the powder feeding device in the warehouse. However, if the production rate is low, it may not be necessary to use such a device.Also, in this embodiment of the press, the electrical In order to sufficiently perform the mechanical powder adhesion prevention action and to ensure that the powder particles are charged at 5 and 9i%, the powder is fed into the initial inlet/feeding device as indicated by the arrow 36. It is also possible to charge the powder to the desired polarity, and depending on the type of powder, the desired result can be obtained. In some cases, the polarity of the charge may vary depending on the polarity of the book or the f! l
! Japanese 11! ! If it is compatible with two things, the positive and negative sides n and j:<, and if the purpose is to measure the performance of the powder feeding device 30 and to vaporize the light, then both the positive and negative polarities. It's like the powder that was accidentally mixed and swallowed (j; f'
i1. : Even if you apply the device and 1゛, you may not get good results. 38 and 39 indicate the purpose of completely preventing excess powder from adhering to the inner surface of the paper cup.
The rt massging device goes through the process described in ``-'' to clarify the boundaries of the rough powder layer 37 formed on the inner surface of the paper cup, and to make the visibility of the seal layer 37 formed after baking. Clarify the product parts 111111ji,
Moreover, it is extremely effective in minimizing the amount of powder that would otherwise be used in vain, but depending on the purpose of the paper container as a product, it may be necessary to clarify the boundary layer. It is of course possible to form a powder layer without using the ki masking device if the masking device is not used, but this may be preferable in terms of production speed and production equipment maintenance. It is difficult to choose one depending on the purpose.

FIGS. 4 and 5 show another embodiment of the paper container manufacturing method and apparatus according to the present invention. FIG. 4 is a longitudinal cross-sectional view of the apparatus according to the present invention in the middle of forming a powder layer 0-) to a necessary capital seal on a paper cup circle, and FIG. FIG. In FIGS. 4 and 5, parts and devices having the same functions as those in FIGS. 1 and 2 are given the same numbers. In FIGS. 4 and 5, the powder feeding device 30 is integrated with the masking device 38, 39, and the forming hole is closely fitted to the inner surface of the paper cup on which the powder layer 37 is to be formed. to snatch

Regarding the arrangement of the outer electrodes, the arrangement of the outer electrodes is exactly the same as in Figs. 1 and 2, so the exhaust system is omitted from the explanation in 5. In the case of the figure - auxiliary electrode 4 for coating the edge bend 26
1 is formed integrally with the powder feeding device 30. 1 plate 56
f'1. is arranged in connection with f'1. An example is shown below.

The upper end of the powder feeding device 30 disposed approximately at the center of the paper cup is the bent part 2 of the periphery of the paper cup where the powder layer is to be formed.
4, the upper end or the entire circumference is opened 7, and the collision plate 53 and the corona discharge electrode 31 are arranged in the opening. In the space 59, a corona discharge electric field is formed in the space 59, and a small corona discharge is generated in the space 59. 'Then, feed the powder through the powder feeding device 30 as shown by the arrow 36 (yee θ)
2r indicated by arrows 62, 62 etc. in the open '-1 section
1. As it moves along the bent portion 24 of the bottom of the paper cup under its own power, it travels along the air current and enters the space 59, and as explained above, it is charged in this space by the existing corona current and then enters the space 59. Due to the existing electric field, a powder layer 37 is applied toward the bent portion 24 of the bottom of the paper cup, forming a powder layer 37, while a space 58 is formed inside the vertical joint 21 of the side wall of the paper cup. , is clearly seen from Figure 5 as the upper end opening 63 of the powder feeding device 30 at the upper end 7) 171! The lower end thereof communicates with the exhaust port 42 as shown by arrows 66 and 67. Therefore, a part of the powder ejected from the upper end opening 63 of the powder feeding device 30 descends through the space 58 as shown by the arrow 65, but When passing through the outer electrode 29, a charge is applied by the corona discharge electrode 31, and the space 58 has an electrode for forming an electric field as an electrode opposite to the outer electrode 29.
The electrode 55 faces the electrode 55, and a voltage of the same potential as the corona discharge electrode or a voltage applied to the high-voltage power supply 35 is applied to the electrode 55, so that the electric field formed in the space 58 causes the space 58 to
A powder layer 21' is formed at the side wall vertical joint 21 of the paper cup where the powder passes through. On the other hand, a portion of the powder is sent out through the upper end opening 63 of the powder feeding device 30 into the box, and as explained above, a powder layer 37 is formed on the bent portion 24 of the bottom body of the paper cup. The roughly cut parts are opened in the massing device 39 at appropriate intervals and are transported downward in a charged state through communication ports 54, as indicated by arrows 64 and 66, fl and fc, respectively. The outer electrode 4 is formed at the bottom edge of the jet and is formed in this part.
A powder layer 26' is formed on the upper edge bent portion 26 of the paper cup by using the electric field f formed between the paper cup 7 and the counter electrode 41. After completing the above-described series of powder layer forming steps, the paper cup 3 on which the powder layer has been formed is integrated with the powder feeding device 30, massing device 39, filter plate 56, and auxiliary electrode 41.
Next, the paper cup is separated from the outer electrode.The paper cup, on which the powder layer has been formed, undergoes a heating process to form a complete layer at a predetermined location.
The product is then completed as a paper container. In addition, Figures 4 and 5
In the embodiment shown in the figure as well, the powder feeding device 30 employs a feeding device @ having an electrodynamic adhesion prevention effect against the powder as described above, so that the powder can be spouted at the outlet of the powder feeding device. In many cases, a suitable result can be obtained by modifying the pressure to a low level, and in some cases, an even more suitable result can be obtained by applying this to the communication pipe 54. The corona discharge electrode 31 installed at the upper end opening 63 of the powder feeding device is not limited to an edge-shaped electrode as shown in the figure.
For example, if the paper cup is small, needle-shaped electrodes may be sufficient, but other types, such as f'l fc needle-shaped electrodes arranged radially at appropriate intervals, may be applied with good results. In some cases, it may occur.

The arrangement of the corona discharge electrode is not limited to the vicinity of the upper opening 63 of the powder feeding device, but also depends on the thickness σ of the paper cup, the shape of the particle used, the production volume, etc. Depending on the conditions, suitable results may be obtained by using a corona discharge electrode near the lower end of the auxiliary electrode 41σ to ensure charging of the powder.

6, 7, and 8 show other embodiments of the paper container manufacturing method and apparatus according to the present invention,
Each subband +5 has the same functions as those in FIGS. 1, 2, 4, and 5, and is given the same number.

In the present embodiment represented in FIG. 6, the seal layer σ] is not formed on the bent portion of the upper edge of the paper cup. Regarding the σ) part, depending on the structure of the paper container, it is possible to correct defects that occur in the σ) part of the paper cup by sealing with a lid or other methods, so it is representatively shown in Fig. 6.
This is because, in some cases, it is necessary to form a sealing layer on a paper cup only at the bent portion of the peripheral edge of the bottom body and the vertical joint portion of the side wall.

FIG. 6 is a longitudinal sectional view of the apparatus according to the present invention at step 7 during the formation of a powder layer, and FIG.
7 shows a horizontal cross-sectional view of the l-line section, and Fig. 8 shows a partial elevational view of Fig. 7's ■1-■Ryokuto σ) and the electrical connections related to that. fcth thing r: In a certain 0 diagram, powder feeding device i! ff1-30 and massing equipment @3
9.38 is integrally formed σn, with a tight fit inside the paper cup. On the other hand, as in each of the above examples, the side electrode 28
．． 29 is a paper cup evening 1111111/il: Arrangement Za1
ing. As shown by the arrow 36, the powder feeding device 3
The upper end of 0 opens toward the bent portion of the peripheral edge of the bottom body on the opposite side of the vertical joint of the side wall 71), where it splits into two parts as shown by arrows 77 and 77', and is connected to gas as shown in arrow 70 by r. An annular coating chamber 72 is provided to form a turbid powder flow, and this annular coating chamber is provided with an internal force applied to the space 76 provided at (c) 4111 of the side wall vertical joint 21 on both sides. )ra powder flow 79
, 79', and the space 73
Apply paint to the powder flow passing through as shown by arrows 79-80-81-67.
Once finished, it is discharged outside. In this case, it is preferable that the circular part of the powder feeding device 30 does not have a structure that has an electrodynamic repulsion effect on the charged particles, as in each of the above-mentioned embodiments. The most distinctive feature of the flow side is the powder particle charging device using silent discharge, the details of which are shown in Figure 8. At least one pair of conductive electrodes 75, 75' is formed inside the tube passageway 720 and embedded in the insulator layer.
Applying a sunset voltage to the voltage via a countercurrent voltage application means 73,
This rVc causes a silent emission to occur in the space 70' inside this electrode, and the ionized gas ions generated by this VC are applied to the power supply 74 to be applied to the electrodes γ1 and γ1. Direct current electric field is applied to the counter electrode 28 (71)
The minute space ion current is 72 minutes J131 r.

Then, the arrow 77°77' passes through the area 72.
, 78, 78' are charged, and at the same time, a countercurrent electric field is formed from the electrodes 75, 75' and 71 toward the outer electrode 28 by the power source 74, and the powder particles are coated on the powder layer 37. It is a complete form.

In this process, the silent discharge electrode to which the full DC voltage is applied is normally installed at the part of the inner electrode 70 that faces the outer electrode 28. The opposing inner space]' is also provided in the electrode 71 and has a space 76r.
It would be better to pass such a current for charging particles in L as well. However, in this case, even if no ion flow is allowed to flow into the space 76, the powder layer 21' can be formed by applying full DC voltage to the electrode 71 by making connections not shown in the figure. It is necessary to measure. In addition, FIG. 9 shows the flow 1 of powder particles flowing along with the gas flow n in the powder coating method and apparatus according to the present invention. The powder particles suspended in the cotton gas generally rise vertically through the center of the masking tube 0-) as shown by arrow 30'. is divided into two semicircular arcs 72a and 72b and flows along the bottom circumference of the paper container, and these flow together at the upper end of the vertical bend of the side wall to form an arrow 73' after finishing coating and leaving a residue. This portion is discharged to the outside.

The method of forming an ion arousal current and a smeared electric field using a silent discharge electrode to which a DC voltage is applied, as shown in the representative embodiment shown in FIG. 6, is extremely effective in the embodiment of the present invention. For example, in Fig. 8, electrodes 75 and 75'
The outwardly convex unequal voltage formed in the area 70' by the evening voltage applying means 73 causes an effect of repelling the powder particles by applying an internal force to the outside. This is due to the fact that, in order to achieve this, by suppressing the presence of powder in this area, a stable discharge current and electric field can be ensured. Therefore, in the example σn shown in FIG. 4, it is also possible to use an unnecessary discharge electrode as shown in FIG. 8 in place of the corona discharge electrode 31. In some cases, the fourth
In the figure, good results may be obtained by replacing the opposing electrode 55 with a silent discharge electrode as shown in FIG. In addition, a suitable result may be obtained by using such a silent discharge electrode in a part of the auxiliary electrode 41 in FIG. 4 to further ensure the charging of particles flying into this part 1/C. be. Above θ) In the embodiments, the electrodynamic repulsion function provided inside the powder feeding means is not limited to the two-phase type, but is also limited to the three-phase type. Favorable results may be obtained by using an alternating current alternating electric field to have not only a particle repulsion effect but also a single particle delivery effect, and these are included in the embodiments of the present invention. 0 In the above explanation, the state of the paper cup is not limited to the orientation of the paper cup, and is not limited to the orientation of the paper cup. Of course, any suitable direction such as upward or sideways may be selected depending on the situation of the apparatus, the shape of the paper cup, the production volume, etc. In the above explanation, Example 1 was also explained regarding a paper cup having a tapered circular cross section, and the scope of application of the present invention in this regard is not limited to only n, but rather a tapered or circular cross section. The method and apparatus according to the present invention can of course be applied to paper cups of the shape of a rectangular parallelepiped or a rectangular parallelepiped, or a truncated pyramid shape, as seen in butter, margarine containers, etc., or a truncated pyramid shape. It goes without saying that it is possible to manufacture paper containers for liquids by applying the method, but it is also possible to manufacture paper containers for liquids by combining the ten commandments of transport, loading, and coating electric field formation depending on the location of the desired seal layer formation. Body painting is done.

In the above explanation, we will use the simplest laminate I, in which a laminate layer made of synthetic resin is formed on the inside of paper as a paper base.
I would like to explain about the paper base material.The paper base material is not limited to paper, but it is made by laminating aluminum foil on the inside or outside of the paper, or on both sides, and then laminating synthetic resin on top of that. Of course, it is possible to apply the present invention to a fIf paper cup assembled by a paper base having a laminate layer formed thereon, and in this case, by using the aluminum foil itself as an external electrode, the VrC of the present invention Similar VC implementations of the method and apparatus are possible.

The uses of the paper container manufactured by the present invention are not limited to those for burning or liquids, but in particular, the use of the paper container manufactured by the present invention is not limited to use for cauterization or liquids. The pool layer has been engineered to have excellent fragrance retention.
It is possible to manufacture high-performance and inexpensive paper containers for products other than liquids that have good sludge permeation prevention properties, and this is naturally included in the scope of the present invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional i*1 diagram of a manufacturing apparatus according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of the n-11 winning section in Figure 1, and Figure 3 (
1. FIG. 4 is a longitudinal sectional view of another embodiment of the present invention. 5(2) is a diagram showing the movement status of a part of FIG.
■ A cross-sectional view of the line section, FIG. 6 is a vertical cross-sectional view of another embodiment of the present invention, and FIG. 7 is a cross-sectional view of the ■-M1 line section of FIG. 6.
FIG. 8 is an enlarged sectional view of a part of still another embodiment of the present invention, and FIG. 9 is a flow 't'1 of powder particles in FIG. 1.
4 Explanatory drawings shown 5 FIG. 10 is a diagram showing the main parts of the conventional embodiment, FIG. 11 is an enlarged sectional view of a part of FIG. 10, FIG. 12 is an enlarged sectional view of another part of FIG. 10, Figure 13 shows the first
FIG. 14 is an enlarged sectional view of still another part of the figure, and FIG. 14 is a plan view of the conventional embodiment. Fig. 15 (1 Longitudinal cross-sectional view of xv-xv spider fft1 in Fig. 14, Fig. 16 is Fig. 15-0) FIG. 18 is an enlarged view of part B, which is a part of the pond in the figure, and FIG. 15 is an enlarged view of part 6, which is another part. 21......Side wall vertical joint 24...
・・・・・・・・・Bottom body periphery bending l526・・・・
...... Upper edge bent portion 28, 29... Outer electrode 30... Powder feeding device 31...
......Corona discharge electrode 35...
...DC power supply 41 ...... Auxiliary electrode 55.71 ... Inner electrode agent Patent attorney Yuu Junto Procedural amendment (method) June 2, 1980 Patent Application No. 090784 of 1981 2, Name of the invention Paper container 3, Relationship with the case of the person making the amendment Patent applicant address 6276 Onoda, Onoda City, Yamaro Prefecture Name of storage land (
024) Kosoda Cement Co., Ltd. 1984f 6
January 2, 1, Display of the case 1982 Patent Application No. 090784 2, Name of the invention Paper container 3, Person making the amendment Relationship to the case Patent applicant address 1:E, Oaza Ono, Koshoda City, Yamaro Prefecture ! 627fll
f Place name (024) Koshoda Cement Removal Company 4, Agent 6, Contents of amendment tlJ Details of descendants Please refer to the attached sheet for the full text and B amendments 0 (2)
The drawing numbers for Figures 71 to 13 in the drawings are included in the paper. 3 Figure" to ?7 Figure" to "Spear 4 Figure"? "Picture 8", "Picture 5", "Picture 9", "Picture 6"? Figure 1'-, 1110'' has ``Figure 77'', ``Figure 1'' has ``Figure 8'', ``Figure 712'' has ``Figure 9'', t' ``Figure 13'' has ``Figure 7IO'', (3) Revised 1st figure after the correction. Correct the drawing ``Edict''' with a figure. Description 1, Name of the Invention Paper Container 2, Claim 1 A paper cup made by assembling laminated paper has a part of a certain width sandwiching the vertical joint of the side wall and the bent part of the periphery of the bottom body, the same type of laminate member or at least a laminate member. A paper container with an electrostatic coating layer made of synthetic resin powder that has adhesive or heat-sealing properties with parts. 3. Detailed Description of the Invention The present invention relates to a paper container for storing various beverages, instant foods, etc., and in particular, it is a paper container that is made of a synthetic material that adheres closely to the surface of the paper base material constituting the paper container and has no breaks. The present invention relates to an inexpensive and high-performance paper container that is coated with a resin film and prevents contents from leaking. The paper containers that are now being used in large numbers for vending machines, parties, instant foods, etc. have the structures shown in Figures 14 to 18, and are designed to store liquids for long periods of time. It is not possible to use such containers for reasons detailed below. In other words, whether this type of paper container for beverage containers or instant food containers is usually made by laminating wax or synthetic resin on the surface of the paper base material for waterproofing purposes or not. When used as a liquid container for a long period of time, leakage may occur through the side wall joint A of the paper, and significant bending may occur in the laminated synthetic resin coating when manufacturing a paper cup from laminated paper at the bottom periphery B and upper periphery C. Cracks develop in the laminate layer, and the resulting leakage makes it impossible to use it as a liquid storage container for a long period of time. To explain this further with the drawings, in FIG. 16, a synthetic resin layer 2 is laminated on the inner surface of the paper base material 1, and a synthetic resin layer 4 is laminated on the inner surface of the paper base material 3. In a normal paper cup made of laminated paper that is joined by the adhesive layer 2a to form the side wall joint of the paper container, or has such a side wall vertical joint, the vertical edges of the paper base material 3 Since the laminate layer is not formed on the edges, the vertical edges of the paper base material 3 cannot exhibit any waterproofing effect, so leakage as shown by arrow 5 occurs, and for this reason, the paper cup cannot be used as a long-term storage liquid container. So, as a way to prevent this kind of leakage, is there a way to seal the paper cup by spraying wax on the exposed paper inside? Is this effective if it is made of laminate or wax? Such containers cannot be used for high temperature applications and are susceptible to mechanical peeling, so their uses are extremely limited. Also, is there a way to achieve the purpose of sealing by applying a synthetic resin dissolved in a solvent to this part? Polyolefin resin, which is commonly used as a laminate material for the inner surface of paper cups, is usually Since there is no adhesive that does not dissolve at all in the solvent and exhibits good adhesion to polyolefin, it is impossible to apply this method when polyolefin is used as a laminate material. For this reason, this method is only of extremely limited use in terms of quantity. Therefore, in a practical sense, the method for preventing leakage in a paper cup laminated with polyolefin resin as shown by arrow 5 in Figure 16 is to use a paper cup manufactured by assembling laminated paper as a liquid container for long-term storage. This is the first reason why it is not possible. Further, as shown in FIG. 17, when the bottom peripheral joint B of the paper container is formed, the laminate layer 13 of the paper base material 11 forming the side wall and the laminate layer 12 of the paper base material 12 forming the bottom body. It is extremely difficult to make the joint between 140 and 140 completely intact, and leakage as shown by arrow 15 occurs from this joint, and leakage as shown by arrow 16 also occurs from this joint. Furthermore, since the paper base material 12 is bent at an extremely acute angle for bonding in this part, it is normal for defects to occur in the laminate layer 14 at this bent part, resulting in the leakage shown by arrow 17. . Leakage due to defects in the laminate layer due to bending of similar magnitude also occurs in the directions of arrows 18 and 19. This is the second reason why paper cups manufactured by assembling laminated paper substrates cannot be used as paper containers for storing liquids for long-term use. Next, FIG. 18 is an enlarged view of the upper edge C of the paper cup in FIG. Is it normal to be processed, and if this is used as a paper container, is it normal to seal the top edge with a method such as heat-sealing the lid with aluminum foil or the like shown in 8 with laminated resin? In this case, the bent portion formed on the upper edge is likely to cause defects in the laminate layer during manufacturing, as shown by arrows 9 and 10, if the container is filled with liquid and falls over. This is the third reason why paper cups assembled with these laminated papers cannot be used as paper containers. The present invention aims to improve the above-mentioned drawbacks of conventional paper containers and to provide a new paper container that does not leak even when liquid is stored therein for a long period of time. The structure of the present invention is such that a paper cup made by assembling laminated paper is coated with a composite material of the same type as the laminate member or at least having adhesiveness or heat-sealability with the laminate member at a certain width area sandwiching the vertical joint of the side wall and the bent part of the peripheral edge of the bottom body. This is a paper container with an electrostatic coating layer made of leachate powder. Further, the details of the paper container of the present invention will be explained with reference to the drawings. It is a paper container as shown in FIG. 1, FIG. 2 shows the structure of the side wall vertical joint 21 in FIG. 1, and FIG. The structure of the peripheral edge part 24, and FIG. 4 shows the structure of the upper edge bent part 26O. That is, the paper container according to the present invention has a side wall formed of a paper base material laminated with a synthetic resin coating on at least the inner surface side. 20 and a one-piece body 23 are combined as shown in FIG. It is integrally formed on the inner surface of the sealed seal portion 22, 22' and the bottom circumferential bent joint, and continuously covers the surfaces of the bottom body circumferential bent portion 24, the seal portion 25, 25', and the upper edge bent portion 26. It is a paper container with a top edge seal 27, 27'. The details of these structures are shown in FIGS. 2, 3, and 4. In the side wall vertical joint 21 in FIG. Laminate layers 205, 2 (1'& in close contact with flIl + wall vertical and wall direct joint 21 laminate layers 20h and 2 on the inner surface of the paper base material)
A vertical sealing layer is formed as shown by 22 and 22' which serially connect and seal 0'h. Further, as is clear from FIG. 3, in the bottom body peripheral bent portion 24, a laminate layer 20b formed on the inner surface of the paper base material 20a forming the side walls and a laminate layer 23h formed on the inner surface of the paper base material 23α forming the bottom body 23. A sealing portion 2 is provided on the bottom circumference to closely connect and integrally seal the bottom body laminate layer shown by
fi, 25' is formed. On the other hand, the upper edge bent portion 26 in FIG.
A series of sealing layers 27 and 27' are formed on a laminated paper base material consisting of 5 and 2fl of paper base material. In addition, in FIG. 2, a paper base material 20 (both having a synthetic resin laminate layer on the inner surface) which mainly forms the paper container is shown.
As explained in detail above, Z is easy to provide sufficient liquid resistance for the purpose of use in ordinary liquid containers, except for the side wall joints and the bent portion of the bottom peripheral edge, and therefore, it is easy to provide sufficient liquid resistance. As shown in Figure 1, the container of the present invention in which a sealing layer is formed on the vertical joints of the side walls and the bent portions of the peripheral edge of the bottom body can be fully used as a container for liquids for the purpose of long-term storage, transportation, etc. Become. The present invention forms powder or a laminate layer of the same type as the laminate layer formed on the inner surface of the paper cup at each predetermined portion of the paper cup which has the structure described in detail above and therefore requires the formation of a sealing layer. Adhesiveness or heat l, I! l! This is a paper container in which adhesive resin powder is charged and applied to form a powder layer, and this is heated to form a sealing layer that is integrated with the laminate layer on the inner surface of the paper cup. Next, to explain embodiments of the method and apparatus for manufacturing paper containers of the present invention, FIG. This is a longitudinal cross-sectional view showing the state in which a layer of powder is forming on the inner surface of the assembled paper cup. It is a cross-sectional view, and FIG. 7 shows the locus of movement of the tip of the powder skewer in FIGS. 5 and 6. In FIG. 5, the paper container formed by the side wall part 20 and the bottom body 23 is made by assembling paper base materials on which a laminate layer is formed on the inner surface of at least laminated paper (in the following description,
The state in which the seal layer according to the present invention is not formed is collectively referred to as a paper cup. ) As shown in FIG. Further, on the outside of the side wall vertical joint part 21 of the paper cup, a narrow plate-shaped joint part outer electrode 29 is closely fitted, and furthermore, on the outside of the mouth part of the paper cup, an outer electrode 47 is fitted. They are arranged so as to surround them, and these are connected as a series, and their potential is kept at the ground potential. 40 is a paper cup that mechanically connects these electrodes to each other. On the other hand, on the inside of the paper roll, masking members 38 and 39 are formed in close contact with areas where the formation of a sealing layer is not required, and 45 and 44 is a support device for these masking members.A pipe-shaped powder feeding device 30 is disposed inside the paper cup as shown in the figure, and a small amount of powder is supplied to this pipe as shown by an arrow 36. Powder of the same type as the laminate layer formed on the inner surface of the paper cup, or at least powder of a resin that has adhesive or heat-sealing properties with the synthetic resin forming the laminate layer, is introduced by the entrained gas and its exit In this case, the powder feeding device 30 preferably has a function to prevent the powder from adhering to its inner surface by an electrodynamic method or device. For this purpose, in the example shown in FIG. 5, the powder feeding device 30 is made of an insulating material, and spiral electrodes 32 and 33 which are insulated from each other are arranged in parallel on the inner surface of the device. An AC voltage of approximately commercial frequency is applied between the two electrodes by the AC voltage applying means 34, and a repulsive force due to an alternating unequal electric field generated between the two electrodes is applied to the inner surface of the powder feeding device 30. At the same time, it prevents the accumulation of powder in
The amount of auxiliary air used to deliver the powder, as indicated by arrow 36, is kept very small to ensure that the powder delivery device 30
The speed of particles and gas ejected from the tip is kept low. On the other hand, a needle-shaped corona discharge electrode 31 is connected to an electrode 33 at the tip of the powder feeding device 30, and a voltage is applied to this by a DC power source 35, so that it is connected to the outer electrodes 28, 29, 47. A minute corona discharge is generated from the tip of the powder feeding bag 7ao at each position, and the powder passing near the corona discharge electrode 3I and ejected from the tip of the powder feeding bag 7ao is reliably charged. Powder particles are ejected from the tip of the powder feeding device 30 through the laminate layer pre-existing on the surface of the filter paper cup and toward the grounded outer electrode 28, which is present on the back side with a paper base material separated from the laminate layer. The powder is driven toward the surface of the laminate layer of the paper container, and an electric field is formed so as to finally form a charged powder layer 31 on the surface of the laminate layer. Using a handling device (not shown), the tip of the powder feeding device 30 should be coated in such a way that the relative position to the area on the inner surface of the paper cup where the charged powder layer 37 is to be formed remains almost constant. An example of this driving situation is one following the sequence and path shown in FIG. 7, i.e., arrow 48. At this point, the tip of the powder feeding device 30 moves along one side of the vertical joint 2I of the side wall to form a seal 22, and then, as shown by an annular arrow 49, the paper cup bottom peripheral bent portion 24 is moved along one side of the vertical joint 2I of the side wall.
The tip of the powder feeding device 30 is moved along the sealing portion 2.
5', and then, as shown by the arrow 50, a sealing part 22' is formed which descends along the other side of the vertical joint of the side wall of the paper cup and continues to the sealing part 25, and then a horizontal annular arrow 51 is formed. As shown, the tip of the powder feeding device 30 moves along the bent portion 26 of the upper edge of the paper cup, and reaches the arrow 52, completing one cycle of movement, during which a charged powder layer is formed at the desired location. Then, from the tip of the powder feeding device 30, the powder of the required number to form the desired powder layer 37 is discharged,
Moreover, since the tip of the powder feeding device 30 that moves along the path shown in FIG. 7 always has an outer electrode outside the paper cup, it always directs the formation of the powder layer of the paper cup towards the desired area. A small corona discharge continues, which makes it possible to form a continuous powder layer. Naoi 4 (
When painting near the upper edge bent part 26 of the cup, it is necessary to form a powder layer on both the inside and outside, so an auxiliary electrode 41 is provided, and a corona discharge electrode is connected to this from the power source 35. By applying electrodes of the same polarity to form a 'i button field, and at the same time drawing in air at an appropriate speed as shown by the arrow 43 through the duct 42 surrounding the outside, the efficiency of coating is improved and the upper edge bent portion 26 is Appropriate amounts of powder layers can be formed on the inner and outer surfaces. In this case, the upper edge bent portion 26
When applying a coating layer, if the electrical resistance of the paper is extremely high, the efficiency of the coating layer may be insufficient. In such cases, the humidity of the paper should be adjusted appropriately to lower the electrical resistance of the paper. It goes without saying that similar methods can be applied to other sites under similar conditions. In this method, the low ejection velocity of the bullet gas at the tip of the powder feeding device 30 makes it possible to perform coating with high efficiency, and is therefore important for obtaining a good production rate, and for this purpose. To achieve this, it is preferable to apply a powder feeding device that is electrodynamically equipped with a means to prevent powder from adhering to the inner surface of the feeding device, or if the production rate is low. In some cases, it may not be necessary to use such equipment. In addition, in order to sufficiently perform the electrodynamic powder adhesion prevention action on the inner surface of the powder feeding device and to ensure that the powder particles at the tip are charged, the powder feeding device shown by the arrow 36 is It is also possible to charge the powder to be delivered to a desired polarity in advance, and depending on the type of powder, good results may be obtained depending on the type of powder. It may be either positive or negative as long as it is compatible with the class, the type of filter paper used, etc., or if the purpose is to fully demonstrate the performance of the powder feeding device 30, it can be used in both positive and negative polarity. Good results may also be obtained by applying a charging device such as one obtained by mixing charged powders. The masking device shown by 38 and 39, which is provided for the purpose of preventing excess powder from entering the inner surface of the paper cup, masks the powder layer formed on the inner surface of the paper cup through the steps described above. It is extremely effective for clarifying the boundaries of the seal layer formed after baking, increasing the commercial value of the product, and minimizing the amount of wasted powder. Depending on the purpose of use of the paper container as a product, it is of course possible to form a powder layer without using a masking device if the boundary layer does not necessarily need to be clarified. There are also cases where it is suitable from the viewpoint of production speed and maintenance of production equipment, and whether or not to use the massing device R may be selected depending on the purpose. FIGS. 8 and 9 show another embodiment of the manufacturing method and apparatus for obtaining the paper container of the present invention. FIG. 8 is a longitudinal cross-sectional view of the apparatus in the middle of forming a powder layer to the necessary markings in the paper cup, and FIG. 9 is a horizontal cross-sectional view taken along line V-V in FIG. . In FIGS. 8 and 9, parts and devices having the same functions as those in FIGS. 5 and 6 are given the same numbers. In FIGS. 8 and 9, the powder feeding device 30 is a masking device 638.3.
9 and is closely fitted to the inner surface of the paper cup on which the powder layer 37 is to be formed, and the coating is performed. Note that the arrangement of the outer electrodes is exactly the same as in FIGS. 5 and 6, so a description thereof will be omitted. The exhaust system is also almost the same as that shown in Figs. 5 and 6, or in the case of Fig. 8, the upper edge bending part 2
The auxiliary electrode 41 for applying 6 is connected to the baffle plate 56 formed integrally with the powder feeding device 30, and the unapplied powder can be recovered more completely. The following is an example of consideration. The upper shaft of the powder feeding device 3o, which is disposed approximately at the center of the paper cup, opens at its upper end or along the entire circumference toward the bent portion 24 of the bottom peripheral edge of the paper cup where the powder layer is to be formed. Collision plate 53
A corona discharge electrode 31 which also serves as a corona discharge electrode is disposed, and this forms an opposite electrode of the first side electrode (S28) and forms an electric field from the corona discharge electrode to the opposite electrode in the space 59.
A minute corona discharge is performed in the space 59 from the corona discharge electrode toward the small Ill electrode 28, and the powder fed through the powder feeding device 30 as shown by the arrow 36 is shown at the opening thereof. 62. As shown by 62, etc., it travels along the airflow toward the bent portion 24 of the bottom of the paper cup, enters the space 59, and is charged by the corona current existing in this space as explained above. Later, due to the electric field existing in the space 59, the powder layer 37 is coated toward the bent portion 24 of the bottom body of the paper cup.
On the other hand, the inside of the vertical joint 21 of the side wall of the paper roll (d
. Therefore, a part of the powder ejected from the upper end opening 63 of the powder feeding device 30 descends through the space 58 as shown by the arrow 65, or the powder n6 through the upper end opening of the feeding device @63
When a charge is applied by the corona discharge electrode 31,
In addition, an electric field forming electrode 55 is opposed to the space 58 as a counter electrode to the outer 1ull electrode 29, and a voltage of the same potential as the corona discharge electrode or 1 high voltage electric current 35 is applied to this, so that the space 58 The powder passing through the space 58 by the electric field formed is driven towards the vertical joint 21 of the side wall of the paper cup to form a powder layer 21'. On the other hand, a portion of the powder ejected through the upper end opening 63 of the powder feeding device @ 30 forms or coats the powder Iso 37 on the bent portion 24 of the bottom body of the paper cup, as described above. The uncoated portion passes through the communication ports 54 provided at appropriate intervals in the masking device 39 and is transported downward while still being charged, and is ejected from its lower end as shown by arrows 64 and 66. However, the upper edge bent portion 26 of the paper cup is
A powder layer 26' is formed thereon. After completing the above series of powder layer forming steps, the powder feeding device 30, the masking device 1d39, the baffle plate 56, and the auxiliary electrode 41 are integrally moved from the paper cup on which the powder layer has been formed. ), and then the paper cup is separated from the first electrode in the next step (・).The paper cup, on which the powder layer has been formed in this way, undergoes a heating process to form a complete sealing layer at a predetermined location. , the product is completed as a paper container. Also in the embodiments shown in FIGS. In many cases, favorable results can be obtained by employing a feeding device and keeping the jetting speed of the powder low at the outlet of the feeding device.
Even better results may be obtained by applying this to the communication pipe 54. Upper end opening 6 of powder feeding device
The corona discharge electrode 31 installed at 3 is as shown in the figure (it is not limited to an edge-shaped open electrode; for example, in the case of a paper cup or small size, a needle-like ↑U electrode is sufficient). In some cases, good results may be obtained by applying other types of electrodes, such as sword-shaped electrodes arranged radially at appropriate intervals. The charging of the powder is not limited to the vicinity of the upper end opening 63+1 of the device, but depending on conditions such as the size of the paper cup, the shape of the material used, or the production speed, it is possible to securely charge the powder near the lower end of the auxiliary electrode 41. In some cases, suitable results may be obtained using a corona discharge electrode for the purpose of the present invention. This figure shows an embodiment, and the parts having the same functions as those in FIGS. 5, 6, 8, and 9 are given the same numbers. The paper cup produced by the paper cup is shown in the case where the seal layer is not formed on the upper edge bent part of the paper cup.Depending on the structure of the paper container, this part may be sealed with a lid or other means in this all part of the paper cassock. Since the defects that occur can be corrected by other methods, the block 1 shown in FIG.
This is because, in some cases, the sealing layer that is formed on the paper cup only needs to be formed on the bent portion of the periphery of the bottom body and the vertical joint portion of the side wall. FIG. 10 is a longitudinal cross-sectional view of the apparatus for manufacturing the paper container of the present invention in a state in which a powder layer is being formed, and FIG. 11 is a horizontal cross-sectional view taken along the line ■-■ in FIG. FIG. 12 is a partial cross-sectional view taken along line 1--2 in Figure 1 and is for illustrating electrical connections related thereto. In the figure, powder feeding device 30 and masking device 39.3
8 is integrally formed and tightly fitted inside the paper cup. On the other hand, similarly to each 1+11 above, the outer electrode 28.
29 are arranged on the outside of the paper cup. As shown by arrow 36, the upper end of the powder feeding device 30 opens toward the bottom peripheral bend opposite the sidewall vertical joint, where it splits into two parts as shown by arrows 77 and 77'. 70% annular coating to form a powder stream suspended in gas as shown in Figure 70.
'One chamber 72 is provided, and this annular coating chamber is connected to form a powder flow 79, 79' from both sides toward a space 76 provided inside the side wall vertical joint 21,
The powder flow passing through the space 73 is discharged to the outside after being coated as shown by arrows 79→80→8]→67. In this case, the powder feeding device l! The inside of 30 has a structure that has an electrodynamic repulsion effect against charged particles, or is preferable to prevent sticking to the charged particles, as in each of the above-mentioned embodiments 1+11.The biggest feature of this embodiment is This is a powder particle charging device using silent discharge, the details of which are shown in FIG. A current direct voltage is applied to at least a pair of embedded conductive electrodes 75 and 75' via an alternating current voltage applying means 73.
This generates a silent radiation in the space 70' inside this electrode, and the ionized gas ions thus generated are transferred to the direct current 'tF field ( (Thus, a minute space ion current is caused to flow along the region 72 toward the opposite electrode 28,
This causes arrow 77.77' to pass through region 72. 78.78', and at the same time the power source 74 charges the powder particles flowing from 75.75' to the outside 'f) f4i
A powder layer 37 is formed by applying a DC electric field toward li;2s. In normal cases, it may be sufficient to provide a silent discharge electrode to which such a DC voltage is applied at the inner electrical contact 70 facing the outer electrode 28, or in some cases, it may be sufficient to provide the silent discharge electrode at the inner electrical contact 70 facing the outer electrode 28. It would be better to provide this type of current for particle charging in the space 76 as well by providing it in the orange 71 as well. However, in this case, even if no ionic current is passed through the space 76, it is necessary to apply a DC voltage to the electrode 71 through connections not shown in the figure to form the powder layer 21'. be. Note that FIG. 13 shows only the flow of powder particles flowing along with the gas flow in the powder coating method and apparatus shown in FIGS. 10, 11, and 12. The powder particles suspended in a small amount of gas first rise vertically through the center of the masking device as shown by the arrow 30', and then move upward through two semicircular arcs 72.
It separates into parts Q and 72b and flows along the bottom circumference of the paper container, and these join together at the top of the vertical bend of the side wall to form arrow 73', and the remaining part is discharged to part 1 after the coating is completed. It is. The method shown in FIGS. 10 to 13 in which an ionic current and a coating electric field are formed using a silent discharge electrode to which a DC voltage is applied is extremely effective as an example of the method for manufacturing the paper container of the present invention. This is, for example, the AC voltage applying means 7 formed between the electrodes 75 and 75' in FIG.
Since the outwardly convex alternating unequal electric field formed in the area 70' by 3 has the effect of repelling the powder particles outward, adhesion of the powder to this area is suppressed, resulting in a constantly stable discharge. This is due to the fact that it is possible to secure current and electric field. Therefore, for example, it is possible to use a silent discharge electrode as shown in FIG. 12 instead of the corona discharge electrode 310 shown in FIG. In FIG. 8, this is the first
In some cases, good results may be obtained by replacing the silent discharge electrode as shown in Figure 2.Also, the auxiliary electrode 41 in Figure 8 may be used instead.
In some cases, favorable results can be obtained by using such a silent discharge electrode in a part of the battery to further increase the charge of particles flying into this part. As a means of manufacturing the paper container of the present invention, the repulsion function having an electrodynamic repulsion effect provided inside the powder feeding means, which is often mentioned, is not limited to a two-phase repulsion function, but a three-phase repulsion function. Favorable results can be obtained by using an AC alternating electric field to have not only a particle repulsion effect but also a particle transport effect. In the above explanation, the state of the obtained paper cup was explained with the opening facing downward, but in this regard, the orientation of the paper cup is not limited to this.
Of course, an appropriate direction such as upward or sideways can be selected for use depending on the condition of the linking device, the shape of the paper cup, the production volume, etc. Furthermore, in the above description, the shape of the paper cup is all about a paper cup having a circular cross section with a cross section. As mentioned above, the scope of application of the present invention in this regard is not limited to this, and it is of course applicable to rectangular parallelepipeds found in butter, margarine containers, etc. It goes without saying that the paper container for liquid of the present invention can be manufactured by applying the above method and apparatus to a paper cup having a shape close to this or a trapezoidal shape with corners = Ic, and it is also possible to manufacture a paper container for liquids of the present invention, and it is also possible to produce a paper container for liquids of the present invention. The application of the powder may be carried out by combining the transportation, charging, and application electric field formation methods depending on the location of the part. In the above explanation, the explanation has been made regarding the simplest laminated paper base 2 in which a laminated layer of synthetic resin is formed on the inside of the paper as the paper base material of the paper container of the present invention.The paper base material is limited to kneading only. Laminate a layer of aluminum foil on the inside or outside of the paper, or both.
=I=Even if the paper cup assembled using the paper base material obtained is tilted, it is of course possible to make a paper container similar to the paper container of the present invention by applying the above-mentioned manufacturing method and apparatus. In this case, it is possible to implement the same method as the paper container of the present invention by using the aluminum foil itself as an external electrode. The use of the paper container of the present invention is not limited to use for liquids, but in particular, a sealing layer similar to that of the paper container of the present invention may be formed on a cup made of a paper base material combined with aluminum foil. This makes it possible to produce high-performance, inexpensive paper containers used for foods other than liquids that have extremely good aroma retention and gas permeation prevention properties, and this is also within the scope of the present invention. Of course. 4. Brief explanation of the drawings Fig. 1 shows the main parts of one embodiment of the paper container of the present invention, Fig. 2
The figure is an enlarged sectional view of a part of Fig. 1, Fig. 3 is an enlarged sectional view of another part of Fig. 1, Fig. 4 is an enlarged sectional view of still another part of Fig. 1, and Fig. 5 is an enlarged sectional view of another part of Fig. 1. FIG. 6 is a vertical cross-sectional view of a paper container manufacturing apparatus according to an embodiment of the invention, FIG. 6 is a cross-sectional view taken along the line ■-■ in FIG. 5, and FIG. 7 shows the movement of a part of FIG. 5. 8 is a longitudinal sectional view of a paper container manufacturing apparatus according to another embodiment of the present invention, FIG. 9 is a cross sectional view taken along the line ■-V in FIG. 8, and FIG. FIG. 11 is a longitudinal cross-sectional view of a paper container manufacturing apparatus according to an embodiment, FIG. 11 is a cross-sectional view taken along the line 1--■ in FIG. 10, and FIG. Fig. 13 is an enlarged sectional view of a part of the apparatus for the purpose of the present invention, and Fig. 13 is an explanatory drawing showing the flow of powder particles in Fig. 5.
The figure is a plan view of a conventional paper container.
A longitudinal cross-sectional view of the V-XV line section, Figure 16 is xv in Figure 15.
Figure 17 is an enlarged view of part A on the cross section of the +-x ■ line.
Figure 18 is an enlarged view of part B, which is the other part of Figure 5.
This is an enlarged view of part 0, which is still another part of Figure 5. 21......Side wall vertical joint 24...
......Bottom body peripheral bent part 26...
...... Upper edge bent portion 28,29... Outer electrode 3o... Powder feeding device 31...
...Corona discharge electrode 35...
・・DC power supply 41 ・・・・・・・・・・Auxiliary electrode 55.7] ・・Inner electrode agent Patent attorney Haku Saifuji

Claims (1)

[Claims] 】 The paper cup made by assembling the laminated paper sheets has adhesiveness or thermal fusion properties with the same type of laminate member or at least with the laminate member at a certain width between the vertical joint of the side wall and the bent part of the periphery of the bottom body. A paper container made of electrostatic coating layered with synthetic ml fat powder.