JPS60110639A - Bottom cover folded vessel made of boxboard - 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 Field of the Invention The present invention relates to a paperboard liquid container coated entirely with a thermoplastic resin, and more particularly to an improved finish of a thermoplastic resin coating to eliminate suction from the panel edges of the container. Regarding the bottom lid of a cardboard container.

BACKGROUND OF THE INVENTION In the past, coated cardboard containers have been widely used for filling and packaging of milk and other liquid products that do not require a long shelf life. These containers have exposed edges with no as-cut coating because the cedar board stock from which they are made is cut from large sheets or rolls.

These exposed edges are susceptible to suction or penetration of the wall panel by the contents of the container. This suction action ultimately weakens the container and precludes its use for liquids with long shelf life, such as fruit juices, syrups, and others.

A satisfactory method for eliminating such internal basolateral exposed edges is disclosed by Miller et al. in U.S. Pat. No. 3,412,922.
Disclosed and explained in the issue. However, with certain models of forming, filling and sealing machines, the method described above first folds along the crease line as a separate operation prior to folding the two outer bottom panels, then the tabs on the lower bottom panel. It is not desirable to fold parts back. See also Miller et al. U.S. Pat. No. 5,294. ! No. 110 discloses and describes a method for folding the distal half of an insert and edge of a lower bottom panel along its entire width along the fold line prior to completion of the fold insert and sealing. has been done.

OBJECTS OF THE INVENTION Accordingly, it is a general object of the present invention to provide an improved coated cardboard container with a long shelf life that eliminates exposed edges on the inside of the container.

Another object of the present invention is that a center tab formed on the lower bottom panel of the other non-insert type is automatically folded down during the forming process to form a moisture-tight sealing edge in the center of the bottom lid. However, the object of the present invention is to provide a coated cardboard container in which the sealing edge eliminates the suction effect from the edge.

Another object of the present invention is that by folding the central tab portion free of adjacent free-cut edges that would cause problems with jamming of the container forming machine formed on the closing panel,
The object of the present invention is to provide a method for eliminating suction from the edges of coated cardboard containers.

These and other objects and advantages of the present invention will become apparent by reference to the accompanying drawings.

(Explanation of Examples) Next, a detailed explanation will be given with reference to the drawings.

FIG. 1 illustrates the inner surface of the container cedar board material 10. As shown in FIG.

The container material 10 is roughly divided into three groups by fold lines 12 and 14 formed alternately. The group above the fold line 12 is referred to as an upper lid group 16. The group between fold lines 12 and 14 is called trunk group 18.
It is called. The group with crease line 14 or less is bottom cover group 2
It is called 0. The sides of the container material 10 are lateral edges 22 and 24.
formed by a series of fold lines 26.2, 30, and 32 vertically divided. Fold line 26.28.30
and 32 connects the trunk group 18 to the side wall panel 34°36.3
8 and 40, and a side seam flap 42.

Triangular end panels 44 and 46 are joined at fold line 12 to the upper edges of sidewall panels 34 and 38, respectively. A first pair of folded panels 48 and 50 join diagonal fold lines 49 and 51 forming triangular end panel 44 . A second pair of folded springs 152 and 54 connect to diagonal fold lines 53 and 55 forming triangular end knob 46. A pair of inner rib panels 56 and 5B are folded back to the panel 48 along fold lines 57 and 59, respectively.
and connected to the outer edge of 50. Similarly, a pair of inner rib springs A 160 and 62 are connected to the outer edges of folded springs A 152 and 54 by fold lines 61 and 63, respectively. A pair of outer roof panels 64 and -66 are connected at fold line 12 to the upper edges of wall panels 36 and 40, respectively. A pair of outer sealing rib panels 6B and 70 are folded along the fold lines 69 and 7.
1 to the upper edges of roof panels 64 and 66, respectively. A complete description of the top group 16 is not necessary to understand the principles of the invention. However, if desired, U.S. Pat.
See No. 270.940.

As far as the bottom cover group 20 is concerned, a pair of outer springs /I/
74 and 76 connect to the lower edges of sidewall panels 34 and 38, respectively, by fold line 14. A pair of triangular folded panels 78 and 80 similarly connect by fold line 14 to the lower edges of sidewall panels 36 and 40, respectively. A pair of folded panels 82 and 84 have diagonal fold lines 83 and 8
5, respectively, to panel 78, and a pair of folded panels 86 and 88, respectively, connect to panel 80 by diagonal fold lines. A rectangular fold tab 90 connects to panel 74 by a horizontal fold line 92.

An extension 94 is formed in the panel 76 and overlays a portion of the panel 74 as described below. A beveled edge 96 is formed on the extension 94 to mate with a beveled edge 98 formed on the side seam flap 42 edge.

Except for the folded tab 90, the extension 94 and the beveled edge 98.
The free edge of the bottom lid group 20 is a straight line 99.

When creating the container material 10 for assembly as a container, the roof panel 66, the side wall panel 40, and the folding panel 8 are assembled.
0 and the folded panels 86 and 88 connected thereto are folded along the fold line 60 along with the side seam flaps, so that the inner surface of each panel is in contact with the inner E surface of the triangular end panel 46, the side wall panel 38, and the outer panel 76. The side seam flap 42 then extends beyond the fold line 28.

Triangular end panel 44, side wall panel 64 and outer panel 74 are arranged such that their inner surfaces are connected to roof panel 64, side wall panel 3
6 and the inner surfaces of the folding panel 78 and the folding panels 82 and 84 connected thereto, about the fold line 26. The side edges 22 are thus substantially aligned with the fold line 32 and the edges that follow the side edges are aligned with and contact the outer surface of the side seam flaps 42. The outer surface of the side seam flap 42 is secured to the inner surface of various panel members along the side edge 22. Fixation can be achieved in a variety of ways. One preferred method is heat sealing, which establishes a surface bond between panel members that are in instant contact. Next, the container material 10 is formed into an open tube shape as illustrated in FIG.

In normal production operations, the bottom cover group 20 is closed and sealed, the contents are placed in the tubular container body, and the top cover group 16 is then closed. Details of the formation of the material joining the side seam flaps and the closure of the top lid group are contained in the aforementioned US Pat. No. 3,270,940.

The beveled edges 96 and 98 of the bottom panel 76 and side seam flaps 42 are provided to prevent an extra layer of paper from forming at the bottom closed base. Therefore, spring A/76 is the side seam flap 4.
They are aligned so that they do not overlap with each other, but are stepped on the panel 74, and the middle is sealed as shown in FIG.

The process up to the completion of the closing operation of the bottom cover 20 will be illustrated in more detail in FIGS. 3 to 6. Starting from the open-ended tube-shaped structure illustrated in FIG.
4. 86 and 8B, and outer panels 74 and 76, etc. are first bent inward as shown in FIG. The panels are then placed under fairly intense heat to enhance the adhesion of the outer and inner layers of resin material, such as polyethylene.

With reference to FIG. 5, it can be seen that pre-folding of tab 90 along fold line 92 is not necessary in a typical forming operation on a forming, filling and sealing machine, since the tubular material (
3) is attached to a mandrel 100 rotating counterclockwise as shown in FIG. This causes the outer panel 76 to fold more downwardly along the fold line 14 upon contacting the fixed forming shoe 102. The tack finger 104 then pivots clockwise about the pivot pin 106 in its upper part, so that the outer panel 7.4
is folded downwardly along the fold line 14 so that the tab 90, rather than the panel 74, is attached to the free edge 10 of the extension 94 of the outer panel 76.
brought into contact with 8. Thus, no snagging between panels 74 and 76 can occur and tab 90 effectively folds back along fold line 92 and flattens against panel 74 on the underside of extension 94 as it is sealed. become. The tub, when confined between its underlying integral outer panel 74 and overlying outer spring/I/76,
There is no exposed edge in 0, and there is a sealed edge 92 as seen from inside the container. On the outside of the container (Figure 7), a continuous seal is formed between extension 94 and panel 74 adjacent tab 90 across the entire width of extension 94. This completely eliminates the possibility of gap leaks occurring along the edges of the covered tabs 90.

The exposed edge 24 along the length of the side seam flap 42 may also be eliminated by use of the folded edge method described and disclosed in Miller et al., patent no. &412,922.

This is not relevant to the invention.

It is clear that the present invention provides a simple and effective means for eliminating exposed edges on the inner surface of the bottom rib.

Although the present invention has been specifically described above, it should be remembered that many changes may be made within the present invention.

[Brief explanation of the drawing]

FIG. 1 is a developed plan view of the thermoplastic resin-coated cardboard container material on which the container bottom lid of the present invention is formed, and FIG. 3, 4 and 5 are partial perspective views sequentially illustrating the three steps involved in forming the bottom lid of the present invention; FIG. 6 is a plan view of the inside of the completed bottom lid; Figure 7 is Figure 6 7-7
This is a partially enlarged view of a cross section along a line viewed from the direction of the arrow, and the names of the main numbers in the figure are as follows. 10: Container material 16: Top lid group 18: Body group 20: Bottom lid group 22: Side edges 34.36.38.40: Side wall panels 42: Side seam flaps 44.46: Triangular end panels 48.50.52 .54.82.84.86.88: Folded panel 56.58.60.62; Inner rib panel 64.66: Outer roof panel 68.70: Outer sealing rib panel 74.76: Outer panel 78.80: Triangular fold Panel 90: Folded tab 94; Extension 96.98: Beveled edge 100: Mandrel 102: Fixed forming shoe 104: Tack finger 106: Pivot pin 108: Free edge! ;'I Engraving of iG+ (U for changes in content) 1 Figure 3 Part 1-ゝ＼ Procedural amendment (method) December 1981 101Tl Indication of the case of Mr. Manabu Shiga, Commissioner of the Patent Office 1988 Special Title of the invention of Application No. 165034 Relationship with the Ministry case for amending cardboard bottom lid collapsible container Name of patent applicant F-Cell-O Corporation Agent 〒103 Drawings subject to amendment, contents of original certificate Drawings as attached engraving (no changes in content)

Claims (3)

[Claims] (1) A liquid container formed from an integrally foldable stock of cardboard coated entirely with a heat-sealable thermoplastic material, the liquid container having: (a) four folds formed by spaced longitudinal and transverse fold lines; two torso panels and side seam flaps, the side seam flaps being secured to the inner surface of the edge portion of the upper torso panel adjacent thereto to join the torso panels into a tubular container on the west side; b) a top lid panel coupled to each of said torso panels, and C) three equal length panels coupled to each of said torso panels and one of said three equal length panels disposed on the opposite side. and a bottom lid panel comprising one long folded panel overlying said three equal length panels; The rectangular tabs are folded back into engagement with the three equal length panels about the fold line and are closely held by the long folded panels. A liquid container further comprising a rectangular tab that is sealed in place. (2) A liquid container formed from an integrally foldable material of cardboard fully coated with a heat-sealable thermoplastic resin material, the liquid container being formed by: (a) intersecting spaced vertical and horizontal fold lines; b) a top lid panel connected to each said body panel; and c) a bottom lid panel connected to each said body panel, three of which panels have a width. It is approximately half the length of the torso panel,
and a bottom lid panel, one of which panels being a longer folded chimnel for overlaying the opposite bottom lid panel; d) overlaying said side seam flaps adjacently; a central portion of one free edge of the bottom lid panel at a position opposite to the long folded panel in a container in which the body panels are joined together to form a four-sided tubular container; a tab formed in a folding press, the tab being folded back into engagement with one of the successive bottom lids as a result of contact with the edge of the long folding panel at the folding press, and being extended by the long folding panel; Liquid container 0 further comprising a tab (3) of a one-piece, flat, thick-set material coated with thermoplastic rosin, having four body panels, side seam flaps, and four bottom lid panels; The two alternating bottom panels are triangular retaining panels,
the remaining panels are rectangular, one of the rectangular panels having a flap tab centrally located on its edges, and the other rectangular panel having an extended edge for overlaying the outside of the other rectangular panel; A method of forming a liquid container from a cardboard stock, comprising the steps of: a) folding the stock in half and applying the side seam flaps to an adjacent body panel edge; and b) looping the folded half. c) placing the tubular material on a rotatable shaft; and d) two opposing arrangements. e) folding two opposing rectangular panels toward each other on the triangular panel; abutting the free edge of the extension and contacting the rectangular panels connected to each other by overlying the extension over one rectangular panel and the flap tab; g) placing the bottom cover substantially over the rectangular panel; and sealing the entire length of the part.