JPS5843264B2 - Taisuiyoukinoseizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a water-resistant paper container.

Conventionally, the method of laminating plastic film (mainly polyethylene film) on both or one side of the base paperboard to thickly cover the heat-sealed parts of important parts such as joints, or pasting the joints of paperboard containers with tape. A method is being adopted to do so.

In addition to the above methods, wax coating is used to contain liquids or powders, but since the joint end surface of the container assembly is cut and unprocessed, liquid can penetrate and cause the liquid to leak. There was a risk of leakage.

The present invention completely eliminates this drawback, and takes into account especially the end faces of the paperboard of paper containers.

To explain this method in detail, first of all, let's take a paper cup as an example, as shown in Figure 1. 1 is a paperboard, and 2 is a blank sheet with a width along one edge of the desired shape. (Approximately 2 to 3 times) Punching portions 3 are provided.

Next, as shown in FIG. 2, when a water- and oil-resistant thermoplastic film 4 is laminated and adhered to the entire paperboard, the punched portion takes on the shape of a window made of only the film.

The opposite side of the paperboard film is printed, and Figure 3 is a cross-sectional view of the punched area of the paperboard laminated with the film.
Since the required blank sheet is cut at the film-only portion 6 of the punching section 3, one end surface of the paperboard is completely covered with the plastic film.

Note that 5 indicates a printed portion. The method of laminating the film onto paperboard is to laminate the paperboard 1 with punched parts 3 as shown in Fig.
moves on a conveyor belt 7 capable of vacuum suction, and flows down the molten plastic film 4 from the T-die 8 of the extruder located above, and also passes through a vacuum suction device 9.
As shown in FIG. It is also possible to press between the rolls 11 and bring them into close contact.

An example of assembling the above in an integrated production line is No. 6.
As shown in the figure, a paperboard 1 is fed from a web into a printing machine 1.
2, the part 5 is printed, dried in the dryer 13, sent by a group of guide rolls 14 and tension rolls 15, and then punched out by the punching machine 17 into the part 3 of the paperboard 1. Immediately before that, the position is adjusted by the phototube 16. A confirmation will be made.

Next, the molten plastic film 4 and the paperboard 1 flowing down from the extruder T-die 8 are pressed between a silicone roll 10 and a cooling roll 11, and the two are laminated.

Then, just before the press punching plate 18, which is sent by the guide rolls 14 group and the tension rolls 15 to punch out the blank sheet 2, is detected by the phototube 16, and the position adjustment is confirmed.

The film-laminated blank sheet punched out in this manner is transferred to an accumulation line 19.

The blank manufactured as described above has the shape shown in FIG. 7, and is glued to the gluing space a for assembling the cup.

The paper cup assembled from this blank sheet is the 8th
In the state shown in perspective view A, the cross section of the body is as shown in Fig. 8 B. The blanks, whose end faces are covered with a film, are stacked one on top of the other so that one side is on the inside of the container, and heated in the glue margin a. Join firmly with a seal, then attach the bottom.

The container manufactured by the method of the present invention is obtained by punching out a portion of paperboard with a certain width corresponding to the seam end of the paperboard joint, and
Next, a thermoplastic oil- and water-resistant plastic film is laminated and adhered to one surface of the paperboard up to the punched part and the end face of the punched part, and then a blank sheet of a predetermined shape is punched out, including the punched part, and the film is used as the inside. Since the container is manufactured by stacking and heat-sealing the containers with the joint portion having a film on the end face on the inside, the end face of the joint portion is covered with a film, so there is no fear of liquid leakage due to oozing of the liquid.

Also, although the press processing process increases, by covering the end face of the cylinder with a resin film, the process is simplified and made easier, making it possible to manufacture such containers without modifying the existing cup manufacturing machine. be.

Moreover, by selecting the plastic film for lamination to be used, it is possible to manufacture containers that are oil-resistant, water-resistant, and high-temperature resistant (70 to 80°C).

It goes without saying that the blank sheet whose end surface is covered with plastic can be used not only for cups but also for containers of various shapes to produce water-resistant containers.

[Brief explanation of drawings]

FIG. 1 shows a state in which a punch out having a width corresponding to one end of the shape of a blank sheet set in a paperboard is provided. FIG. 2 shows a state in which a plastic film is laminated on a paperboard provided with punches. Figure 3 is an enlarged cross-sectional view of the blank sheet cut at the film part of the punching section, Figures 4 and 5 are illustrations of the process of laminating the film on the paperboard, and Figure 6 is the process until the blank sheet is punched out. FIG. 7 is a sketch of a punched blank sheet, FIG. 8A is a perspective view of a completed paper cup, and FIG. 8B is an enlarged cross-sectional view of the body of the completed cup. 1...Paperboard, 2...Blank sheet shape, 3...Punching section, 4...Plastic film, 5...Printing Part, 6...
Blank sheet cutting section, 7... Conveyor, 8... Extruder T-gui, 9...
... Vacuum suction device, 10 ... Silicon roll, 11 ... Cooling roll, 12 ... Printing machine, 13 ... Dryer, 14. ...Guide roll, 15...Tension roll, 16.
... Phototube, 17 ... Punching machine, 18 ...
...Blank sheet punching machine, 19... Accumulation line. Claim 1: In the production of paper containers, paperboard is punched out with a certain width at a portion corresponding to one seam end of the joint of the container, and then the punched portion and the end face of the punching are stamped on one surface of the paperboard. After laminating a thermoplastic water- and oil-resistant plastic film to the desired size, the sheet is punched out into a blank sheet of a predetermined shape, including the punched part, and stacked with the film on the inside and the joint part with the film on the end face on the inside. A method for manufacturing a paper container, characterized by heat sealing. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing water-resistant paper containers. Conventionally, the method of laminating plastic film (mainly polyethylene film) on both or one side of the base paperboard to thickly cover the heat-sealed parts of important parts such as joints, or pasting the joints of paperboard containers with tape. A method is being adopted to do so. In addition to the above methods, wax coating is used to contain liquids or powders, but since the joint ends of the container assembly are cut and unprocessed, the liquid may penetrate and cause leakage. There was a risk. The present invention completely eliminates this drawback, and takes into account especially the end faces of the paperboard of paper containers. To explain this method in detail, first of all, let's take a paper cup as an example, as shown in Figure 1. 1 is a paperboard, and 2 is a blank sheet with a width along one edge of the desired shape. A punched portion 3 (approximately 2 to 3 mm) is provided. Next, as shown in FIG. 2, when a water- and oil-resistant thermoplastic film 4 is laminated and adhered to the entire paperboard, the punched portion takes on the shape of a window made of only the film. The opposite side of the paperboard film is printed, and Figure 3 is a cross-sectional view of the punched area of the paperboard laminated with the film.
Since the required blank sheet is cut at the film-only portion 6 of the punching section 3, one end surface of the paperboard is completely covered with the plastic film. Note that 5 indicates a printed portion. The method of laminating the film onto paperboard is to laminate the paperboard 1 with punched parts 3 as shown in Fig.
moves on a conveyor belt 7 capable of vacuum suction, and flows down the molten plastic film 4 from the T-die 8 of the extruder located above, and also passes through a vacuum suction device 9.
As shown in FIG. It is also possible to press between the rolls 11 and bring them into close contact. An example of assembling the above in an integrated production line is No. 6.
As shown in the figure, a paperboard 1 is fed from a web into a printing machine 1.
2, the part 5 is printed, dried in the dryer 13, sent by a group of guide rolls 14 and tension rolls 15, and then punched out by the punching machine 17 into the part 3 of the paperboard 1. Immediately before that, the position is adjusted by the phototube 16. A confirmation will be made.

Claims (1)

[Claims] 1. In the production of paper containers, paperboard is punched out with a certain width at a portion corresponding to one seam end of the joint of the container, and then one surface of the paperboard is coated with thermoplastic waterproof material up to the punched portion and the end face of the punching. After laminating the oil-resistant plastic film, the sheet is punched out into a blank sheet of a predetermined shape, including the punched part, and the sheets are overlapped and heat-sealed with the film on the inside and the joint part with the film on the end face on the inside. Characteristic paper container manufacturing method.