JPS5962435A - Paper vessel and its manufacture - 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] This relates to a manufacturing method thereof, and in particular, after inserting the bent portion of the peripheral edge of the bottom member into the folded portion of the body member, the folded portion of the body member is inserted between the folded portion of the body member and an external press mold from the inside. The bottom portion is formed by pressing with a knurling having an annular convex portion at the center and diagonal convex portions on both sides of the annular convex portion.

In conventional paper containers, Fig. 3 (1) (II) (I
As shown in III K, the adhesive part (7)' (7
1' (7Y is, for example, in the case of the container shown in Figure 3 mK,
As shown in Fig. 4, a rotating and revolving knurl (9) with many vertical linear protrusions on the side surface in the axis (S) direction.
, the bent part (5) of the bottom member (3) is connected to the body member fi+
The inner surface of the folded part (6) is pressed between the folded part (6) from the inside and the outer press die (8) to form a bottom having a large number of convex parts (C1). ing.

However, the bottom of the paper container formed by this method has a bonded part (7) where there is a possibility that the contents may leak because the entire width (dlK) remains where there is no adhesion (el). This problem is unavoidable when the material is paper, which has strong repulsion.

In addition, conventionally, when folding back the bottom end (2) of the body member (1), since the bottom end (2) of the body member (1) was simply folded back as it is without any process, the folding could not be carried out sufficiently due to the repulsion of the paper.
Incomplete adhesion to the bent portion (5) of 3) may also cause leakage of the contents.

Fig. 3 (IT) shows a diagonal line convex portion CBl'' obtained by a similar method f.
Y, same (the buttons represent the bottom of a container formed with an annular convex portion (A)" and a bottom, respectively, but as above, there is a possibility that the contents may leak.

The present invention has been devised to solve the problems of the prior art described above, and will be described in detail below based on embodiments shown in the drawings.

First, the paper container of the present invention consists of a fan-shaped body member (1) and a circular bottom member (3) as shown in FIGS. 1, 2, and 5, and the body member (1) The periphery (4) of the body of the bottom member (3) is folded almost perpendicularly downward into a groove having a U-shaped cross section, which is formed by forming the bottom member (3) into a truncated conical cane and folding the lower end (2) inward. The bent portion (5) is inserted, sandwiched between the folded portions (6) of the body member (1), and bonded. In particular, the four annular portions (A ) '&
, is characterized by having a large number of diagonal line-shaped portions (Bl) on both the upper and lower sides.

Incidentally, the body member (1) is not limited to a fan shape, but may also be rectangular (,
Therefore, the shape after molding may be cylindrical instead of the inverted truncated cone shape as in this embodiment.

Next, to explain the method for manufacturing the paper container of the present invention, as shown in FIG.
), the main part is a device similar to the prior art shown in FIG. Press the adhesive part (16) between the presser and the outer press mold a to form the bottom part. In this case, since both the body member θ0) and the bottom member (121) are coated with thermoplastic resin such as polyethylene on at least the inner surface, the bent portion (14) and the folded portion (151) are heated in advance with hot air or the like. If you leave it in place, you can easily thermally bond it, but of course you may also use an adhesive such as Honmelt.

Since the present invention is constructed as described above, the folded portion of the body member and the bent portion of the bottom member are not completely adhered to each other at the bottom of the paper container, so that in the unlikely event that the contents seep out to the bottom. Even if this happens, the four diagonal lines on the upper side of the adhesive part are interrupted by an annular recess in the center, which prevents leakage to the bottom, making it particularly effective as a container for liquids for long-term storage. demonstrate.

In addition, according to the manufacturing method of the present invention, when the body member and the bottom member are bonded together, the pressure of the knurling is effectively applied to the inner surface of the folded part of the body member, so resin such as polyethylene on the surface is pushed out, resulting in poor adhesion. It has the effect of filling in some parts.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a developed view of the body member of the present invention, FIG. 2 is a plan view of the bottom member, and FIG. th [th sheet(
FIG. 4 is a perspective view showing the skin, FIG. 4 is a cross-sectional explanatory view showing the manufacturing process of the prior art, FIG. 5 is a perspective view of the paper container according to the present invention, and FIG. The perspective view and FIG. 7 are the same (a plan view showing the manufacturing process, and FIG. 8 is a cross-sectional explanatory view. +11QO1... body member (21 (111...
・Lower end (31 (121...bottom member (4)
...periphery (51041...bending part f61
(151...Folded part (7) +1e+...Adhesive part (8) (tη...External press mold (9) 031
...Knurl (S) (S) ...Shaft (Al (A)' ... Annular recess (B) (Bl')
...Four diagonal lines fc'l...Convex portion (a)...Annular convex portion (b)...Diagonal convex portion Patent applicant Toppan Printing Co., Ltd. Figure 1 1

Claims (2)

[Claims] (1) Bend the peripheral edge of the flat bottom member downward substantially vertically into a groove having a U-shaped cross section by folding the lower end of the cylindrical body member inward, and insert the bent part into the groove; The container is made by adhering the body member and the bottom member, and the lower end of the body member has four annular portions approximately in the center of the inner surface of the adhesive portion and four diagonal line portions on both sides of the annular four portions. A paper container characterized by having a large number of containers. (2) Bend the peripheral edge of the flat plate-shaped bottom member downward substantially perpendicularly into a groove having a U-shaped cross section formed by folding the lower end of the cylindrical body member inward, and insert the bent portion into the groove. When manufacturing a container, the body member is formed into a cylindrical shape on a mandrel of an arbitrary shape, and a bottom member whose periphery is bent approximately vertically in advance is placed near the upper opening end of the body member. After placing the upper part of the body member, the vicinity of the opening end is folded inward, and the bent part of the bottom member is held.
After that, the bent portion of the bottom member is pressed from the inside between an external press mold and a knurling having an annular convex portion at the center and diagonal convex portions on both sides thereof to form the bottom portion. A method for manufacturing a paper container.