FR2645119A1 - CONTAINER AND METHOD FOR ITS MANUFACTURE - Google Patents

Abstract

The container has a skirt 2 formed by a roll of kraft paper, and having a rectangular plan view. A bottom element 3 is inserted on the bottom side and glued with folded parts of the skirt. In an upper part 4, located on the side opposite the bottom, the skirt is formed so that the upper perimeter of the container 1 is offset inwards parallel to the rectangular surface of the bottom, which produces a peripheral shoulder 5 to the transition to the other part of the skirt 2. Linear grooves 7 extend vertically between the shoulder and the upper edge of the container. This arrangement stabilizes the rectangular shape of the container in its upper part. In particular, it prevents flaring of the flat lateral surfaces of the container.

Description

The invention relates to a container and a method for its manufacture.

container with a skirt

  lateral formed by rolled Kraft paper and with an over-

  rectangular lower face, a rectangular element forming the bottom being inserted at the base and glued with folded parts of the skirt, as well as a process for its manufacture. Containers of this kind are known per se. In known embodiments, the skirt is generally obtained by winding in a circular cylinder, and then deformed by spacing to form a rectangular profile. The

  well-known containers of this kind have a rectangular shape.

  correct area near their bottom, this shape being

  determined by the bottom inserted in the skirt and fixed to it

  this; however, they tend to have outwardly curved lateral surfaces in their upper parts and

  such deformation is sometimes accepted first.

  This is undesirable on the one hand because it partially cancels the advantage which consists in being able to transport containers having the shape of parallelepipeds, saving space as much as possible. In addition, if the cover is adjusted to the

  fairer, it then becomes difficult to close the container

  pient. We therefore seek & form a container of the type described above so as to avoid the faults mentioned, so that the container maintains the rectangular shape.

  also desired in its upper part.

  The problem is solved as stated in

claims.

  The peripheral shoulder composed of recti-

  lines makes the upper part more rigid & counter

  a curvature of the lateral surfaces in the peri-direction

  spherical, because the shoulder forms a reinforcement edge

  is lying. The vertical grooves between the shoulder and the Dr.LP / m -2 edge of the container prevent a corresponding deformation in

direction of the generators.

  Preferably, vertical and linear grooves are provided on either side of each corner of the container, so as to form with this corner a channel of variously

  well defined, and also to strengthen the corner against

  side impact formation when the cover has

been removed.

  An embodiment of the invention will now be described with the aid of the accompanying drawings. In it Figure I shows a perspective view of a container with lid; Figure 2 shows a plan view of the vicinity of a corner; Figure 3 shows a plan view of a side wall with slightly different grooves; Figure 4 shows a side view of part of the container; Figure 5 shows schematically the winding process; Figures 6 and 7 schematically represent intermediate stages of manufacture, and Figure 8 schematically shows a container

of known type.

  Rectangular containers of known type made of Kraft paper tend to flare outwards in the upper part of their lateral surfaces, which makes it difficult to maintain a correct rectangular shape. The

  Figure 8 shows a schematic plan view of such a reci-

  pient 1 'of known type. The correct rectangular shape is indicated in drawn points. This deformation can result on the one hand from a certain tendency of the skirt obtained by winding to return to its old form, and it can also be caused by the contents of the container, in particular when its cover is removed. Obviously this makes it more difficult to replace the cover. To remedy this problem, containers have also been made -3-- whose plan view has such a shape, including the bottom and the cover. However, this results in a loss of space when the containers are to be stored in the

smallest possible volume.

  Figure 1 shows a container 1 made according to the invention. This container has a skirt 2 and a rectangular bottom 3 inserted therein. The skirt is formed of Kraft paper rolled up and glued as will be described more in

  detail below. In its upper part, the skirt is

  formed so that the upper periphery 4 of the container 1 is offset by a certain distance inwards relative to the rest of the skirt 2. A shoulder

  S is formed at the transition of the two surfaces. Every sec-

  tion of this shoulder 5 being essentially straight, it makes the corresponding lateral surface more rigid and

  able to resist a curvature in the peripheral direction.

  At the same time the shoulder forms a connection surface for a cover 6 which has the same plan view as the

  container skirt 2. Preferably, the surface of the shoulder-

  ment 5 will be slightly inclined downwards and outwards

  eur, as shown in figure 4. This avoids too great stresses in the material, and prevents

  simultaneously the accumulation of the material contained in the container

  pient or dust on the surface of the shoulder.

  In addition, the upper part 4 of the skirt is provided with linear grooves 7, extending vertically between

  the shoulder 5 and the edge of the container. These grooves make

  ent the upper part of the skirt more rigid towards

  deformations in the direction of the generators. These cannel-

  ures 7 partially sink into the surface of the shoulder-

  ment 5, to avoid too great local constraints in

the material.

  The grooves close to the lateral edges are arranged so as to form a discharge channel 9, in

  cooperation with the edge 8 of the container (see FIG. 2). This-

  this allows to precisely pour the material contained in -4 -

  the container, by tilting it around a corner.

  As also shown in Figure 2, the near region

  of the ridge thus forms a U-shaped profile which improves the stability

  bed against impact on the edge. The grooves 7 preferably have a curved shape. Other profile shapes are however possible, such as a trapezoid profile

(figure 3).

  The manufacture of the container 1 will now be illustrated using FIGS. 5 &7; First of all, the skirt 2 is formed by winding Kraft paper 10, one side of which is coated with glue, for example by means of a roller 11 (FIG. 5). The inner winding mold 12 has a rectangular section, so that the layers of

  paper overlap in their final position.

  After wrapping the wrapped material is split

  in a part 2 forming a skirt and a part 6 forming a neck

  circle (figure 6). A bottom 3, 14 is then inserted into each of these parts, and this bottom is then glued by means of a press & folded tabs forming part of the skirt. The upper part 4 of the skirt is then deformed

  as described, also by means of presses.

  Faced with its shape, the container described composed of a skirt formed by winding a Kraft paper and having a rectangular plan view can be stored in a compact group and therefore requires a lower transport volume.

  for example to that required by cylindrical vessels.

  ques. Unlike the cylindrical container, it does not have

  no reinforcing metal circles and can be easy-

  dumped and destroyed. Thanks to the arrangement described, it

  nevertheless sows a stable form, even in difficult climatic conditions, such as great heat and high humidity, because the shape of its upper part

  largely prevents its deformation.

_ 5-_

Claims (5)

Claims   1. Container with a side skirt formed by rolled Kraft paper, and with a rectangular bottom surface, a rectangular element (31 forming the bottom being inserted at the base and glued with folded parts of the skirt, characterized in that an upper part (4) located & opposite the bottom the skirt (2) is deformed so as to offset the upper periphery   container inward, parallel to the over-   rectangular lower face so as to produce, at the point of passage to the other parts, flat,   lateral faces a sensitive shoulder (5)   rectilinear on each lateral surface, and in that in the upper part of the linear grooves (7) extend vertically between the shoulder and the edge of the container.   2. Container according to claim 1, characterized in that a groove (7) is placed on either side of each corner (8) of the container, to form a pouring channel (9) with the corner, as well as to reinforce this one.   3. Container according to one of the preceding claims.   teeth, characterized in that the shoulder (5) is inclined outward and downward.   4. Container according to one of the preceding claims.   teeth, characterized by a cover (6) comprising a side skirt formed by rolled Kraft paper as well as a rectangular base surface of dimensions   exactly matching those of the container skirt.   5. Method for manufacturing the container with lid according to claim 4, characterized in that the Kraft paper is wound with the application of adhesive on   an inner roll of essentially rectangular section   laire. In that the deformation of the coiled skirt of the container in its upper part is obtained by applying pressure by means of presses having corresponding shapes.