Process of making folded cardboard container covered by a layer of synthetic material and provided with a peripheral frame

• US 4,555,381 A
• Filed: 03/23/1983
• Issued: 11/26/1985
• Est. Priority Date: 11/07/1980
• Status: Expired due to Fees

• Current Assignee: Societe Parisienne D'Impression et de Cartonnage
• Original Assignee: Societe Parisienne D'Impression et de Cartonnage
• Inventors: Chazal, Guy A., Bodet, Jean A.
• Primary Examiner(s): Silbaugh, Jan
• Application Number:
  US06/477,951
• Time in Patent Office: 979 Days
• Field of Search: 264/511, 264/512, 264/516, 156/224, 156/287, 156/245, 493/94, 493/102, 493/113, 493/167
• US Class Current: 264/516
• CPC Class Codes: B29C 51/165 combined with the feeding or the shaping of the lining or the labels by injection moulding B29C45/14008, B29C45/1418
• CPC Class Codes: B65D 5/2033 polygonal having more than four sides, e.g. hexagonal, octogonal
• CPC Class Codes: B65D 5/2042 triangular
• CPC Class Codes: B65D 5/2047 trapezoidal, e.g. to form a body with diverging side walls B65D5/2033 takes precedence
• CPC Class Codes: B65D 5/321 at least one container body part formed by folding up portions of a single blank connected to a central panel from all sides
• CPC Class Codes: B65D 5/56 Linings or internal coatings , e.g. pre-formed trays provided with a blow- or thermoformed layer to protect the articles from mechanical damage B65D81/127
• CPC Class Codes: B65D 5/563 Laminated linings; Coatings
• CPC Class Codes: Y10T 156/1048 to form dished or receptacle-like product

Abstract

A process of making a container of the dishtype, including, on the one hand, a bottom 40, walls 31 to 34 and 41 to 44 and edges 30a to 30d of exterior cardboard and, on the other hand, of a thermo-formed layer 2 of synthetic material. The edges 30a to 30d are constituted by the sides of a frame 30 and are in one piece. The frame 30 is integral with the walls 31 to 34, bent downward. The bottom 40 is integral with the walls 41 to 44, bent upward and complimentary to the walls 31 to 34. All walls are placed so as to be on the same level and are maintained by the layer 2.

Claims

1. Process of making a container comprising an exterior portion of cardboard having a frame positioned in a single plane, wall panels and at least one bottom panel and a portion of a synthetic material formed of a single layer which is applied onto the surface of the cardboard portion forming the interior of the container and the exterior of the frame and which is adherent over the entire surface of the cardboard to which it is applied to maintain the relative position of the frame, the walls and the bottom panel comprising the steps of:

(a) providing a blank of a first type having a frame and a plurality of wall panels integral with the interior sides of the frame and a blank of having second type having a bottom panel and a plurality of wall panels integral with the exterior sides of said bottom panel;

(b) placing a blank of the first type and then at least one blank of the second type thereupon in a position and orientation with respect to a die hving the form and interior dimensions thereof corresponding to the exterior form and dimensions of the container to be made and whereby the frame of the blank of the first type is disposed over an edge of the die and the bottom panel of the blank of the second type is disposed substantially in vertical alignment with a bottom of the die;

(c) maintaining the frame of the blank of the first type applied against the edge of the die and maintaining the blank of the second type so that it cannot move laterally or change the orientation thereof relative to the form of the die;

(d) exerting a vertical push upon the common plane of the superimposed first and second blanks which is directed toward the bottom of the die to cause simultaneously the bending of the wall panels integral with the frame toward the bottom of the die, the folding of the wall panels which are integral with the bottom panel in the direction opposite to the direction of bending of the wall panels integral with the frame and the penetration of the bottom panels of the blank of the second type through the interior of the frame to the bottom of the die, so that all the wall panels integral with the frame and with the bottom panel are disposed in generally side-by-side, interfitted juxtaposition with the same alinement of the surfaces thereof by pressure against the walls of the die;

(e) applying a layer of synthetic material so that it extends over and adheres to the bottom panel to the frame and to all the wall panels whereby there is formed by the combination thereof a container which is rigid and tight.

2. The process according to claim 1, wherein the vertical push onto the common plane of blanks is carried out by means of a retractable punch, and the synthetic layer is applied thereafter.

3. The process according to claim 1, wherein said layer of synthetic material is applied by thermo-forming.

4. The process according to claim 3, wherein the vertical push is applied onto the common plane of the blanks at the time of thermoforming of the layer of synthetic material, by means of compressed air which is applied onto said layer.

5. The process according to claim 1, wherein the blank of the first type that wall panels remain interconnected by a central portion to which they are attached to three small tongues which are to be cut by the effect of the vertical push onto the common plane of the the blanks, whereby the central portion falls on the bottom of the die and under the bottom panel of the blank of the second type and is removed after forming of the container.