CA1254427A - Method of reinforcing cardboard boxes - Google Patents
Method of reinforcing cardboard boxesInfo
- Publication number
- CA1254427A CA1254427A CA000467522A CA467522A CA1254427A CA 1254427 A CA1254427 A CA 1254427A CA 000467522 A CA000467522 A CA 000467522A CA 467522 A CA467522 A CA 467522A CA 1254427 A CA1254427 A CA 1254427A
- Authority
- CA
- Canada
- Prior art keywords
- parts
- resin
- reinforced
- blank
- cardboard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
ABSTRACT
METHOD OF REINFORCING CARDBOARD BOXES
The invention relates to the production of cardboard cartons and in particular it relates to a method for the production of a presentation box of high mechanical strength from a pregrooved or prescored blank (1) of a cardboard of small thickness which is able to accept offset printing and to be grooved or scored according to conventional mechanical or HF methods.
The method of the invention consists in selectively reinforcing the parts (25 to 29) of the blank (1) which are not traversed by a grooved or scored line (6 to 8 and 16 to 22) in such a manner as to leave non-reinforced parts enabling subsequent forming to shape of the box, at either side of the different grooved or scored lines. This reinforcement may be provided by the application of cutouts of an auxiliary material positioned and bonded by high frequency on the parts which are to be reinforced, or by a complete or partial impregnation of the cardboard blank (1) with a hardenable polymerizable resin and an HF treatment serving to produce a localized hardening of the resin in the parts which are to be reinforced. The invention is applicable in particular to the production of boxes for the packaging of heavy objects.
METHOD OF REINFORCING CARDBOARD BOXES
The invention relates to the production of cardboard cartons and in particular it relates to a method for the production of a presentation box of high mechanical strength from a pregrooved or prescored blank (1) of a cardboard of small thickness which is able to accept offset printing and to be grooved or scored according to conventional mechanical or HF methods.
The method of the invention consists in selectively reinforcing the parts (25 to 29) of the blank (1) which are not traversed by a grooved or scored line (6 to 8 and 16 to 22) in such a manner as to leave non-reinforced parts enabling subsequent forming to shape of the box, at either side of the different grooved or scored lines. This reinforcement may be provided by the application of cutouts of an auxiliary material positioned and bonded by high frequency on the parts which are to be reinforced, or by a complete or partial impregnation of the cardboard blank (1) with a hardenable polymerizable resin and an HF treatment serving to produce a localized hardening of the resin in the parts which are to be reinforced. The invention is applicable in particular to the production of boxes for the packaging of heavy objects.
Description
- ~L2S442~, The present invention relates to a method for the production of a cardboard presentation box of high mechanical strength for the packaging of eomparatively heavy objeets such as glass bottles filled with a liquid.
For the production of cardboard boxes of high mecha-nical strength which offer a substantial degree of rigidity after being shaped cardboard grades of considerable thickness and substantial density are utilized. However, the printing and grooving or scoring techniques utilized impose limitations in practice. As a matter of fact, for a cardboard grade of greater weight than 500 g. it is no longer possible to utilize ofset printing ana, similarly, for cardboard grades of greater weight than 600 g. it is no longer possible to make use of the conventional mechan-ical or HF grooving or scoring methods. For cardboard grades of weight up to 700 g. the grooving or scoring operation may be replaced by an embossing or corrugating method, but this technique is costly and the embossing or corrugating operation may be performed only at a low speed.
In order to eliminate this disadvantage, micro-corrugated cardboard grades have been developed which, for a small thickness, have a higher mechanical strength than an ordinary eardboard of the same thickness. These card-boards may be subjected to offset printing and grooved or scored by conventional techniques. However, they frequen-tly suffer from surface deformations which are unacceptable if a high-quality appearance oE the box is sought.
The present invention has as its object to provide a method for the production of a presentation box having a very high mechanical strength and a substantial degree .~
~ ' l~S9~ ~Z'7 of rigidity, from cardboard grades of small thickness which are able to accept offset printing and to be grooved or scored in accordance with conventional mechanical or HF
methods permitting operation at high speeds.
S More specifically, there is provided, in accordance with the present invention,a method for the production of a presentation box of high mechanical strength and of substantial rigidity from a pregrooved or prescored blank of cardboard of small thickness able to accept offset printing and to be grooved or scored in accordance with conventional mechanical or high frequency grooving or scoring methods, characterized in tha-t it comprises selec-tive reinforcement of parts of the blank not traversed by grooves or score lines so as to produce on each side oE
the different grooves or score lines parts which are not reinEorced to allow subsequent folding of the blank to form the box, said selective reinforcement step comprising impre-gnation of at least said parts to be reinforced with a har-denable, polymerizable resin and exposure of the par-ts to be reinforced to a high frequency field, in order to produce a poly-marizatlon and hardening of the resin only over said parts to be reinforced.
The use of a cardboard blank of small thickness convenient to undergo offset printing enables scoring or ~grooving of the blank according to a conventional method and at high speed prior to reinforcing the blank by the method according to the invention. Given that this reinfor-cement does not affect -the folds, the reinforced blank may be formed to shape easily by conventional mechanical means.
In accordance with preferred embodiments of the invention, (a) only the parts to be reinforced an impregnated with resin, or (b) all the surface of the cardboard blank is impregnated with resin but only the parts to be reinforced are exposed to the high frequency field.
The resin preferably consists of a thermosetting :: ~
12S4 ~7 resin, such as an acrylic resin, an urea formol resin, a melamine formol resin, a phenolic resin or else combinations of resins of this kind.
The impregnation of the carclboard blank may be made either by immersion of the cardboard blank in a bath of resin, or by projecting the resin onto at least one sur-face of the blank.
Possibly, a further reinForcement may be effec-; ted by applying an auxiliary material combined with the said imprenation. In this case, the bonding of the auxiliary material and the polymerization of the impregnating resin are preferably performed by means of a single HF treatment.
~ The auxiliary material may consist of a pliable - ~ or semi-rigid material such as a fabric, leather, or a sheetof a plastics material or else a rigid material such as wood, cardboard, a metal sheet or a sheet of a rigid plastics material.
The invention will now be further described, by way of example, with reference to the accompanying dra-wings, in which:-Figure 1 is a plan view of a prescored card-board blank processed in accordance with the method of the invention, :
~: /
/
:: ~ :
~,~3 ~s~z~l Figure 2 is a diagrammatic perspective view of an HF treatment tool for carrying out a preferred embodiment of the method in accordance with the invention, and S Figure 3 is a diagrammatic perspective view of an HF tool for the hardening of an impregnating resin utilized according to another embodiment of the method in accordance with the invention.
Figure 1 shows a cardboard blank 1 for a cardboard box which has been cut out and prescored in a conventional manner in order to form a parallelepipedic presentation box. This blank 1 has panels 2 to 5 intended to form the side, rear and front walls of the box. The panels are separated by scored lines 6 to 8. Furthermore, at their upper and lower extremities, these panels carry flaps 9 to 15 intended to form the base and lid of the box. These flaps are separated from the said panels
For the production of cardboard boxes of high mecha-nical strength which offer a substantial degree of rigidity after being shaped cardboard grades of considerable thickness and substantial density are utilized. However, the printing and grooving or scoring techniques utilized impose limitations in practice. As a matter of fact, for a cardboard grade of greater weight than 500 g. it is no longer possible to utilize ofset printing ana, similarly, for cardboard grades of greater weight than 600 g. it is no longer possible to make use of the conventional mechan-ical or HF grooving or scoring methods. For cardboard grades of weight up to 700 g. the grooving or scoring operation may be replaced by an embossing or corrugating method, but this technique is costly and the embossing or corrugating operation may be performed only at a low speed.
In order to eliminate this disadvantage, micro-corrugated cardboard grades have been developed which, for a small thickness, have a higher mechanical strength than an ordinary eardboard of the same thickness. These card-boards may be subjected to offset printing and grooved or scored by conventional techniques. However, they frequen-tly suffer from surface deformations which are unacceptable if a high-quality appearance oE the box is sought.
The present invention has as its object to provide a method for the production of a presentation box having a very high mechanical strength and a substantial degree .~
~ ' l~S9~ ~Z'7 of rigidity, from cardboard grades of small thickness which are able to accept offset printing and to be grooved or scored in accordance with conventional mechanical or HF
methods permitting operation at high speeds.
S More specifically, there is provided, in accordance with the present invention,a method for the production of a presentation box of high mechanical strength and of substantial rigidity from a pregrooved or prescored blank of cardboard of small thickness able to accept offset printing and to be grooved or scored in accordance with conventional mechanical or high frequency grooving or scoring methods, characterized in tha-t it comprises selec-tive reinforcement of parts of the blank not traversed by grooves or score lines so as to produce on each side oE
the different grooves or score lines parts which are not reinEorced to allow subsequent folding of the blank to form the box, said selective reinforcement step comprising impre-gnation of at least said parts to be reinforced with a har-denable, polymerizable resin and exposure of the par-ts to be reinforced to a high frequency field, in order to produce a poly-marizatlon and hardening of the resin only over said parts to be reinforced.
The use of a cardboard blank of small thickness convenient to undergo offset printing enables scoring or ~grooving of the blank according to a conventional method and at high speed prior to reinforcing the blank by the method according to the invention. Given that this reinfor-cement does not affect -the folds, the reinforced blank may be formed to shape easily by conventional mechanical means.
In accordance with preferred embodiments of the invention, (a) only the parts to be reinforced an impregnated with resin, or (b) all the surface of the cardboard blank is impregnated with resin but only the parts to be reinforced are exposed to the high frequency field.
The resin preferably consists of a thermosetting :: ~
12S4 ~7 resin, such as an acrylic resin, an urea formol resin, a melamine formol resin, a phenolic resin or else combinations of resins of this kind.
The impregnation of the carclboard blank may be made either by immersion of the cardboard blank in a bath of resin, or by projecting the resin onto at least one sur-face of the blank.
Possibly, a further reinForcement may be effec-; ted by applying an auxiliary material combined with the said imprenation. In this case, the bonding of the auxiliary material and the polymerization of the impregnating resin are preferably performed by means of a single HF treatment.
~ The auxiliary material may consist of a pliable - ~ or semi-rigid material such as a fabric, leather, or a sheetof a plastics material or else a rigid material such as wood, cardboard, a metal sheet or a sheet of a rigid plastics material.
The invention will now be further described, by way of example, with reference to the accompanying dra-wings, in which:-Figure 1 is a plan view of a prescored card-board blank processed in accordance with the method of the invention, :
~: /
/
:: ~ :
~,~3 ~s~z~l Figure 2 is a diagrammatic perspective view of an HF treatment tool for carrying out a preferred embodiment of the method in accordance with the invention, and S Figure 3 is a diagrammatic perspective view of an HF tool for the hardening of an impregnating resin utilized according to another embodiment of the method in accordance with the invention.
Figure 1 shows a cardboard blank 1 for a cardboard box which has been cut out and prescored in a conventional manner in order to form a parallelepipedic presentation box. This blank 1 has panels 2 to 5 intended to form the side, rear and front walls of the box. The panels are separated by scored lines 6 to 8. Furthermore, at their upper and lower extremities, these panels carry flaps 9 to 15 intended to form the base and lid of the box. These flaps are separated from the said panels
2 to 5 by scored lines 16 to 22. The flap 10 and the panel 5 moreover comprise a sealing tab 23 and 24, respectively.
The blank 1 is produced from a cardboard of smaller weight than 500 g. in order to allow conventional cutting out and scoring by means of mechanical devices operating at a high speed. Furthermore, the cardboard may then be printed by a rapid and economical offset method.
In order that a box of very high mechanical strength may be produced from this blank 1, the parts which are not traversed by the scored lines 6 to 8 and 16 to 22 of the panels 2 to 8 and of the flaps 9 to 15 are the parts which are selectively reinforced by the method ~'S
.s.~
1~2544~7 according to the invention. In the embodiment illustrated in Figure 1, only the panels 2 to 5 and the flap 10 are reinforced as illustrated diagrammatically at 25 to 29. Practice has shown that a reinforcement of this kind is sufficient to increase the m~chanical strength of the box obtained, to a considerable degree. It is however evident that it is also possible to reinforce the whole of the panels and flaps of the cardboard blank 1.
Accordinq to a first embodiment of the method in accordance with the invention, this reinforcement of ~ the~parts 25 to 29 is performed by positioning separate `~ cutouts of an auxiliary material and bonding these : ~
cutouts on the cardboard blank 1 by means of an HF bonding method. Operations of this kind are rapid and economical and may easily be performed on a machine such as that described in the Applicants French patent application published under number 2,523,509 on September 23, 1983.
According to the invention, materials which are ~; 20 pliable, semi-rigid or rigid and which are able to be bonded on the cardboard blank 1 by an HF bonding method, may be utilized as the auxiliary materials. Advantag-eously pliable materials such as fabrics and leather, or semi-rigid or rigid materials such as cardboard and sheets of plastics materials or sheet metal may be utilized.
In the case of the utilization of auxiliary materials which are comparatively expensive and which equally serve the purpose of improving the aesthetic appearance of the box obtained, the method according to the .~ ' .
, ~s~'~z~
invention and the embodiment illustrated in Figure 1 in particular, make it possible to accomplish considerable savings on material which may amount to 40~ as compared to the consumption of material in accordance with th~
known methods in which the whole surface of the card-board blank 1 is covered. For example, in the case of utilization of leather, this represents a considerable advantage.
Figure 2 diagrammatically shows an llF bonding tool for bonding cutouts of auxiliary material on the parts which are to be reinforced, 25 to 29 of the cardboard blank 1 illustrated in Figure 1. The top plate 30 of a conventional HF press is shown in this figure. This plate 30 carries on its lower face a separate bonding tool 31 to 35 formed by a rectangular frame of a brass section for each cutout of auxiliary material which is to be bonded. A peripheral bond of this kind of the cutouts of auxiliary material has proved to be sufficient to enhance the mechanical strèngth of the box obtained.
According to another embodiment~ of the method in accordance with the invention, the parts 25 to 29 of the cardboard blank 1 are~reinforced by impregnating them~with a thermosetting polymerizable resin. These parts 25 to 29 are then exposed to an HF treatment producing a localised polymerization and hardening of the resin in the parts which are to be reinforced.
-To this end, use is made of resins able to harden under the action of an HF treatment.
According to another embodiment of the method in ~54~2~
accordance with the invention, the whole of the surface of the cardboard blank is impregnated with a thermosetting resin. Only the parts which are to be reinforced are thereafter exposed to the HF treatment,thus producing S a localised polymerization and hardening of the resin, whereas the fold lines or projections of the cutout are unaffected by this treatment and thus permit forming the box to shape by mechanical means.
Thermosetting resins are preferably utilized for this impregnation, such as acrylic resins, urea formol resins, melamine formol resins, a phenolic resin or else combinations of such resins. The catalysts utilised with these resins determine the final rigidity of the treated parts of the cardboard blank.
An HF tool such as that illustrated in Figure 3 is utilised for the HF treatment in these last two embodiments. The top plate 36 of a conventional HF
press, which is not illustrated in detail, is apparent from this figure. The plate 36 comprises on its lower 20 ~ace, for each part 25 to 29 of Figure 1 which is to be reinforced, a separate HF tool 37 to 40 formed by a sectional rectangular frame. Each frame comprises a series of longitudinal and transverse webs 42 and 43 respectively. Practice has shown that a tool of this kind enables the carrying out of a polymerization and hardening of the impregnating resin in the parts 25 to 29 which are to be reinforced, in a manner adequate to effect a considerable improvement of the rigidity of the cardboard blank 1.
According to a preferred embodiment of the method i2S~'~L2'7 in accordance with the invention, the selective reinfor-cement by the application of cutouts of auxiliary material is combined with the reinforcement by means of localized impregnation and hardening. In this case, the cardboard blank 1 is first impregnated with an ` appropriate resin. The auxiliary material cutouts are then placed in position and, during another stage, an HF treatment is applied to effect the bonding of the - cutouts and the localized hardening of the resin. If appropriate, this operation may be performed in a single stage and with a single appropriate HF tool.
This tool may be of the kind illustrated in Figure
The blank 1 is produced from a cardboard of smaller weight than 500 g. in order to allow conventional cutting out and scoring by means of mechanical devices operating at a high speed. Furthermore, the cardboard may then be printed by a rapid and economical offset method.
In order that a box of very high mechanical strength may be produced from this blank 1, the parts which are not traversed by the scored lines 6 to 8 and 16 to 22 of the panels 2 to 8 and of the flaps 9 to 15 are the parts which are selectively reinforced by the method ~'S
.s.~
1~2544~7 according to the invention. In the embodiment illustrated in Figure 1, only the panels 2 to 5 and the flap 10 are reinforced as illustrated diagrammatically at 25 to 29. Practice has shown that a reinforcement of this kind is sufficient to increase the m~chanical strength of the box obtained, to a considerable degree. It is however evident that it is also possible to reinforce the whole of the panels and flaps of the cardboard blank 1.
Accordinq to a first embodiment of the method in accordance with the invention, this reinforcement of ~ the~parts 25 to 29 is performed by positioning separate `~ cutouts of an auxiliary material and bonding these : ~
cutouts on the cardboard blank 1 by means of an HF bonding method. Operations of this kind are rapid and economical and may easily be performed on a machine such as that described in the Applicants French patent application published under number 2,523,509 on September 23, 1983.
According to the invention, materials which are ~; 20 pliable, semi-rigid or rigid and which are able to be bonded on the cardboard blank 1 by an HF bonding method, may be utilized as the auxiliary materials. Advantag-eously pliable materials such as fabrics and leather, or semi-rigid or rigid materials such as cardboard and sheets of plastics materials or sheet metal may be utilized.
In the case of the utilization of auxiliary materials which are comparatively expensive and which equally serve the purpose of improving the aesthetic appearance of the box obtained, the method according to the .~ ' .
, ~s~'~z~
invention and the embodiment illustrated in Figure 1 in particular, make it possible to accomplish considerable savings on material which may amount to 40~ as compared to the consumption of material in accordance with th~
known methods in which the whole surface of the card-board blank 1 is covered. For example, in the case of utilization of leather, this represents a considerable advantage.
Figure 2 diagrammatically shows an llF bonding tool for bonding cutouts of auxiliary material on the parts which are to be reinforced, 25 to 29 of the cardboard blank 1 illustrated in Figure 1. The top plate 30 of a conventional HF press is shown in this figure. This plate 30 carries on its lower face a separate bonding tool 31 to 35 formed by a rectangular frame of a brass section for each cutout of auxiliary material which is to be bonded. A peripheral bond of this kind of the cutouts of auxiliary material has proved to be sufficient to enhance the mechanical strèngth of the box obtained.
According to another embodiment~ of the method in accordance with the invention, the parts 25 to 29 of the cardboard blank 1 are~reinforced by impregnating them~with a thermosetting polymerizable resin. These parts 25 to 29 are then exposed to an HF treatment producing a localised polymerization and hardening of the resin in the parts which are to be reinforced.
-To this end, use is made of resins able to harden under the action of an HF treatment.
According to another embodiment of the method in ~54~2~
accordance with the invention, the whole of the surface of the cardboard blank is impregnated with a thermosetting resin. Only the parts which are to be reinforced are thereafter exposed to the HF treatment,thus producing S a localised polymerization and hardening of the resin, whereas the fold lines or projections of the cutout are unaffected by this treatment and thus permit forming the box to shape by mechanical means.
Thermosetting resins are preferably utilized for this impregnation, such as acrylic resins, urea formol resins, melamine formol resins, a phenolic resin or else combinations of such resins. The catalysts utilised with these resins determine the final rigidity of the treated parts of the cardboard blank.
An HF tool such as that illustrated in Figure 3 is utilised for the HF treatment in these last two embodiments. The top plate 36 of a conventional HF
press, which is not illustrated in detail, is apparent from this figure. The plate 36 comprises on its lower 20 ~ace, for each part 25 to 29 of Figure 1 which is to be reinforced, a separate HF tool 37 to 40 formed by a sectional rectangular frame. Each frame comprises a series of longitudinal and transverse webs 42 and 43 respectively. Practice has shown that a tool of this kind enables the carrying out of a polymerization and hardening of the impregnating resin in the parts 25 to 29 which are to be reinforced, in a manner adequate to effect a considerable improvement of the rigidity of the cardboard blank 1.
According to a preferred embodiment of the method i2S~'~L2'7 in accordance with the invention, the selective reinfor-cement by the application of cutouts of auxiliary material is combined with the reinforcement by means of localized impregnation and hardening. In this case, the cardboard blank 1 is first impregnated with an ` appropriate resin. The auxiliary material cutouts are then placed in position and, during another stage, an HF treatment is applied to effect the bonding of the - cutouts and the localized hardening of the resin. If appropriate, this operation may be performed in a single stage and with a single appropriate HF tool.
This tool may be of the kind illustrated in Figure
3. With an appropriate setting of the HF press, it then simultaneously assures the bonding of the auxiliaxy material cutouts and the polymerization as well as the hardening of the impregnating resin in the parts 25 to 29 which are to be reinforced. The bonding of the auxiliary material cutouts and the polymerization of the impxegnating resin may also be performed i~ two successive stages and with two different tools such ~; as those illustrated in Figures 2 and 3, respectively.
The invention is clearly not limited to the embodiments described and illustrated herein, and numerous modifications may be made without departing from the scope of the lDvention.
.
:
The invention is clearly not limited to the embodiments described and illustrated herein, and numerous modifications may be made without departing from the scope of the lDvention.
.
:
Claims (4)
1. Method for the production of a presentation box of high mechanical strength and of substantial rigidity from a pregrooved or prescored blank (1) of cardboard of small thickness able to accept offset printing and to be grooved or scored in accordance with conventional mechanical or high frequency grooving or scoring methods, characterized in that it comprises selective reinforcement of parts (25 to 29) of the blank (1) not traversed by grooves or score lines (6 to 8 and 16 to 22) so as to produce on each side of the different grooves or score lines (6 to 8 and 16 to 22) parts which are not reinforced to allow subsequent folding of the blank to form the box, said selective reinforcement step comprising impregnation of at least said parts to be reinforced with a hardenable, polymerizable resin and expo-sure of the parts to be reinforced to a high frequency field, in order to produce a polymerization and hardening of the resin only over said parts to be reinforced.
2. Method according to claim 1, characterized in that it comprises impregnation with resin of only the parts to be reinforced (25 to 29).
3. Method according to claim 1, characterized in that it comprises impregnation of all the surface of the cardboard blank (1) and exposure of only the parts to be reinforced (25 to 29) to said high frequency field thereby producing a localized polymerization and hardening of the impregnating resin.
4. Method according to claim 1, 2 or 3, characterized in that the impregnating resin is selected from the group consisting of: an acrylic resin, an urea formol resin, a melamine formol resin, a phenolic resin, and else combinations of resins of this kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000467522A CA1254427A (en) | 1984-11-09 | 1984-11-09 | Method of reinforcing cardboard boxes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000467522A CA1254427A (en) | 1984-11-09 | 1984-11-09 | Method of reinforcing cardboard boxes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1254427A true CA1254427A (en) | 1989-05-23 |
Family
ID=4129117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000467522A Expired CA1254427A (en) | 1984-11-09 | 1984-11-09 | Method of reinforcing cardboard boxes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1254427A (en) |
-
1984
- 1984-11-09 CA CA000467522A patent/CA1254427A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |