Continuous tubular box body production process, particularly for

Details Continuous tubular box body production process, particularly for Continuous tubular box body production process, particularly for

1994-11-10

1997-01-14

Hail, III, Joseph J.

Manufacturing container or tube from paper; or other manufacturi

Tube making

With advancing of tube axially

493276, B29C 5350, B31B 536

Patent

active

055933750

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a process for the continuous manufacture of tubular bodies of boxes, particularly for cardboard boxes, by means of several superposed longitudinal webs, in which webs are continuously moving, glue is applied on at least one side of one or more webs and then these webs are applied lengthwise against a stationary guide ending by mandrel whose circumference defines the transversal profile of the tubular body, this application being performed according to a generating line of the tubular body so that each web has a side flap on either side of the said generating line and being followed by a folding of said side flaps around the mandrel whilst the webs move along the latter.
The U.S. Pat. Nos. 2 256 263 and 3 064 544 describe such a process and machines designed to continuously manufacture tubular bodies of recipients made of several layers of paper by superposing and gluing continuous webs arranged lengthwise, the width of which being equal to the perimeter of the tube to be formed. In this process, the webs are moved forward simultaneously, glue is applied to some of their surfaces, these webs are superposed so that they are slightly offset sideways, they are pressed flat between two rollers to form one multilayer web and then the web obtained is slided along the stationary guide whilst being progressively applied against the latter to give it the tubular shape desired before the glue hardens. Both edges of the initial webs are then placed next to each other to form a longitudinal joint without overlapping each other, the transversal continuity of the tube's multilayer wall being achieved by the mutual offsetting of the joints of the various layers. In the U.S. Pat. No. 3 064 544 there is also provision for both edges of each web to be able to overlap and possibly be bevelled. The tube is then cut into sections to form tubular bodies.
The advantage of this well-known manufacturing process is that it is implemented by means of a relatively simple device but it presents serious drawbacks in terms of the quality of the tubular bodies manufactured.
In particular, while bending the multilayer structure, moistened by the glue, inward transversely, the inner layers tend to crease instead of sliding on the outer layers. There is even provision in U.S. Pat. No. 3 064 544 to mark in advance the position of the folds by forming grooves on the webs. The creasing phenomenon is particularly noticeable in the angles of the tubes with a polygonal cross section. It leads to the inside of the tube being in bad condition, irregularities in the thickness and the compactness of the multilayer structure, as well as a weakening of the tube's wall as only the layers not creased withstand transversal stress. Furthermore, a crease in a layer means there is a narrowing of the corresponding web, therefore preventing the edges of this web from joining properly. The joint becomes too wide and moves closer to the previous or next joint which weakens the tube. Moreover, if a layer does slide sideways on the other one, it may do so in an unpredictable manner, more so on either side of the generating line applied first of all against the stationary guide, in such a way that the joints of two successive layers may be too close to one another and thus excessively weaken the tube. Another drawback with this process is that the joints need to be quite close to one another and cannot be set out staggered (i.e. offset first in one direction and then in the other), which allows greater solidity of the wall where they are located.
The European patent application EP-A-0 387 171 describes a process which aims to avoid excessive thicknesses due to both the longitudinal edges of each web overlapping and at offsetting the joints of successive layers sufficiently so as to not weaken the wall of the tubular body. The proposed solution consists in forming each layer successively by applying two webs which each cover a respective part (e.g. half of the perimeter of the mandrel whose edges are adjacent and contiguous without over

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