DE2559292A1 - METHOD FOR MANUFACTURING A Tear-Edge Construction For Separating Wrapping Material Or The Like - Google Patents

Description

IkAm. Wilhelm Seic & el

Bipi mg. Wollgfoig Esiöhel

6 Ficr: kh? -Ii a. M. 1

13th

8357

INTERNATIONAL PAPER COMPANY, New York, New York, VStA

Method of making a tear edge construction for severing wrapping material or the like

The invention relates to a method for producing a tear-open edge, in particular for use for consumer packaging made of aluminum foil, clear plastic wrapping foil, waxed paper and Like. In particular, the invention relates to a method of making an improved tear edge construction, which is formed from a cardboard blank and as an integral component of a dispensing pack that consists of a roll contains such a material that can be easily dispensed in desired lengths.

Typical sheet material dispensing packages of this type are made from cardboard and include a metallic or made of plastic toothed tear-off edge, which is on a front edge or a bottom edge is appropriate to support the removal of desired lengths of material. These edges are expensive and some-

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measured dangerous, because "when handling a pack can the user can easily injure their fingers as the edge is very sharp. In addition, these edges tend to be different Damaging packages on shelves and scratching furniture on which they are placed. Furthermore, the Making the package more cumbersome and difficult when it has its own or separate tear edge device attached to it attach is.

Previous attempts to create a toothed tear edge from cardboard have not been successful. A reason this lies in the fact that so far no one has constructed a cardboard tear edge that is effective and over works properly for the required time without wearing out prematurely.

'The invention is therefore based on the object a To provide a method of making an improved tear edge construction by means of the sheets of material from a Roll or other supply of this material can be separated.

It is also intended to provide a method by which this tear edge construction can be used as an integral Component of a dispensing pack can be produced that contains this material.

The present invention is aimed at solving this problem from a process for the production of a tear-off edge construction, Separable from a supply of this material by means of the pieces of wrapping material or the like are. The invention is characterized by the following steps:

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Cut a jagged line in a piece of cardboard material to create first and second sections form, each of the sections having a tooth line between its ends, which is a serrated or sawtooth-like edge forms and the sections along fold line segments are integrally connected to each other at the opposite ends of the serrated edges, so that the Comb teeth from one of the sections with the gaps between the teeth of the other of the sections, spray on one the teeth hardening material on a selected outside of the piece of cardboard material in the vicinity of the serrated edges under sufficient pressure to cause the material to have substantially its entire thickness of the paperboard penetrates, without noticeably staining its opposite side, folds of one of the sections along the fold line segments against the other of the sections so that each tooth of the one section is between two Teeth of the other section is positioned and connecting the sections together.

The cardboard material in which the jagged dividing line is formed can consist of a cardboard blank, the lower, rear, upper, lower front and upper front walls and a tab that is integral with a selected one of the lower front, lower and upper front walls is connected, the first portion being a Edge of either the lower front-bottom or upper front wall and the second section contains the tab.

The invention will now be described in detail with reference to the accompanying drawings, all of which are taken from the description and the details or features shown in the figures for solving the problem within the meaning of the invention can contribute and were included in the application with the intention of being patented. Show it:

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Fig. 1 is a three-dimensional view, "partially in section, of a tear-open edge construction which, according to the Process according to the present invention can be prepared;

Figure 2 is a top plan view of a cardboard blank showing a jagged line between the added flap and severed the lower front wall of the blank in accordance with the method of the present invention is;

Figure 3 is a top plan view of a second carton blank similar to that of Figure 2 but with the jagged line between the added flap and the top Front wall of the blank is severed in accordance with the method of the present invention;

Fig. 4 is a top plan view of a third cardboard blank, similar to that of Fig. 2, but in which the serrated Line between the added tab and the bottom wall according to the method of the present invention Invention is cut out, with the added flap between the bottom wall and the lower front wall of the blank is provided;

FIG. 5 is a cross-sectional view through the center of the carton blank of FIG. 2 in the assembled state, wherein the added flap is folded and attached to the inside of the lower front wall;

6 shows a view similar to FIG. 5, but of the cardboard blank of FIG. 3 in the assembled state;

FIG. 7 shows a view similar to FIG. 5, but of the cardboard blank of FIG. 4 in the erected state;

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8 shows a three-dimensional view of a tear-open edge construction; those made by the method according to the present invention and with the carton in place Fig. 2 is applied; the carton is shown partially in section, with the tear edge at the top of the lower Front wall is formed, and furthermore an arch is shown which is partially separated by this edge;

FIG. 9 is a view similar to FIG. 8, according to FIG
the tear-off edge construction on the carton in place
Fig. 3 is implemented; the carton is shown partially broken away to reveal the tear-open edge at the bottom of the upper front panel and

Fig. 10 is a view similar to Fig. 8, showing the tear edge construction on the erected carton 4 is realized, wherein the tear-open edge is provided on the front edge of the bottom wall.

The cardboard material from which the tear edge construction is made is preferably an im
Commercially available, sturdy, bleached sulphate paperboard, coated on one side with clay and about a thickness of
0.4 to about 0.56 mm (0.016 inches to about 0.022 inches). Such a cardboard or cardboard box is of the
International Paper Company under the trademark
"Val-U-Coat" available. However, it can also be any other
Paperboard material of an appropriate thickness can be used provided its liquid adsorbent properties permit it to be substantially throughout its entirety
Thickness of the selected hardening material can be penetrated if this material is under a suitable one
Printing on a selected outer surface of the paperboard material
is sprayed on without noticeable coloration of the opposite side of the material.

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Once the paperboard material is selected, a sawtooth-like or jagged dividing line is created in one piece of the material to form first and second sections, each section being a line of teeth has between its ends which form a serrated edge. Although the drawings are detailed below will now be noted that Figs. 2-4 generally recognize at 46 the jagged dividing line that forms the jagged edges. The sections are integral with one another along fold line segments connected, which are indicated in Figs. 2 to 4 generally at 24, and that at opposite ends of the serrated Edges so that the teeth of one of the sections match the gaps between the teeth of the other section cursing.

Preferably each edge has about four to five teeth per inch (25.4 mm). Furthermore, the serrated parting line that forms the teeth is not continuous. The punching tool may be "jagged" so that portions of unpunched material remain along the jagged parting line. Preferably, these unpunched portions are midway between the tips of selected teeth of the parting line, and when so formed they act as hinge elements that hold the teeth of the connect one serrated edge to the teeth of the other serrated edge. One benefit of this step is that both jagged edges are kept in a single plane when the cardboard box is and gluing device moved through. The unpunched material along these edges prevents the teeth from coming out protrude at this level so that they could block the device and be damaged. Another benefit of this The first step is that it facilitates better tooth training and impregnation. Conventional punching

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tools for forming jagged edges are provided with nicks on selected opposite tips, to keep the teeth in a single plane. This leads to an unpunched material on selected tooth tips. This material tears and splits the tip of the relevant teeth when the material is folded along a line midway between the tips of the jagged dividing line. By now the notches in the Has placed punching tool in locations suggested by the tooth forming step according to the invention, this difficulty is avoided and the finished parting line at the tips of each tooth facilitates the impregnation the tips of all teeth with the hardening material instead of hindering the impregnation. It should be noted that the number of sections of unpunched material and the pattern or arrangement of these not punched out Sections can be varied depending on the requirements of the tear edge construction to be produced can.

After the punching tool has severed the jagged parting line in the paperboard material, a selected tooth hardening material is sprayed onto the non-clay-coated side of the paperboard material by means of a spray gun. The tooth hardening material can be selected from a number of materials including, but not limited to, polyurethane varnish, nitrocellulose, or silicone, which are dissolved in a solvent such as acetone, ethyl acetate, or methyl ethyl ketone. The material is preferably a polyurethane varnish manufactured by Polymer Industries and sold under the trademark “Mira-Glos RT 101 A / 101C”. This polyurethane varnish is preferably dissolved in acetone so that it has a viscosity that ranges from about 18 to about 21 seconds ¹¹ measured in a No. 2 tooth dish, but solvents other than the

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above can be used to bring the material to a satisfactory viscosity. The selected However, solvent should not dry so quickly that the hardening material does not completely penetrate the cardboard .

The amount of tooth hardening material that will be applied to the Cardboard material is applied should be so large that it penetrates substantially the entire thickness of the cardboard material, without noticeably coloring the opposite cardboard side. Some of the factors that turn out to be important in the process effective impregnation of the teeth of the serrated edges with a hardening material include the Pressure under which the material is sprayed on, the spray speed, the distance between the spray gun and the cardboard material, the spray pattern that is applied to the cardboard material and the speed at which the cardboard moves relative to the spray source. The following ranges for these factors have been found to be most useful when polyurethane dissolved in acetone forms the selected hardening material, however, they can outside of the given limits vary if other materials are used.

This hardening material is preferably by

sprayed a nozzle on the cardboard with a

ρ ρ

Pressure between about 42 kg / cm to about 56 kg / cm (600 p.s.i.g.

up to about 800 p.s.i.g.) In cases where the tear-off edge construction does not have to have fully hardened teeth, the pressure can be lower, depending on the viscosity the material, the distance of the nozzle from the cardboard and the size of the nozzle opening is the penetration of the Cardboard material is incomplete if the pressure is below 42 kg / cm (600 p.s.i.g.). At pressures above 56 kg / cm (800 p.s.i.g.) the penetration is complete, but the spray or mist is more difficult to control.

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Depending on the specific selected values for the factors mentioned above, it has been found

2 2

that -if the spray pressure is between 42 kg / cm and 56 kg / cm (600 psig and 800 psig), a proper spray speed is achieved when a nozzle is used that is 0.15 l / min. Provides water (0.04 gallons / min) under a pressure of 35 kg / cm (500 psig).

The spray gun is preferably spaced between about 6.35 mm to about 19 mm (0.25 inches to about 0.75 inches) held by the paperboard material on teeth of the size shown. For larger or smaller teeth in the jagged edges and variations in the other factors mentioned above, the spacing can be greater or greater be smaller, as long as the material pattern sprayed onto the cardboard material is at least the entire tooth surface between covers the tips of the jagged dividing line. If the nozzle is between 6.35 mm and 19 mm (0.25 in and 0.75 in) from the paperboard is held away, the spray pattern is preferably from about 6.35 mm to about 19 mm in width (0.25 inch to about 0.75 inch) when it reaches the cardboard.

In general, the following applies: In the preferred manufacturing process for the tear-off construction, the cardboard material moves up as a flat or even sheet a conveyor below the spray gun, with the tooth hardening material as a uniform coating is applied to the teeth. It has been found that under the conditions mentioned above, the paperboard material moved below the nozzle at speeds up to 3000 m / h to about 6000 m / h (10,000 ft./h to about 20,000 ft./h) can be to achieve a proper penetration or penetration of the hardening material.

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It is noted that if a value is for one of the above-mentioned factors, e.g. for the viscosity of the tooth hardening material outside of the above mentioned Range, the value of the other factors, for example for the pressure under which the spray is applied can be modified so that the amount of hardening material applied remains constant.

After the cardboard material has been cut and the tooth hardening material has been applied, the Cardboard folded along the unpunched fold line segments at the opposite ends of the toothed edges, to form the tear edge construction where everyone Tooth of the first serrated edge is arranged between two teeth of the second serrated edge. This double layer Rip edge construction is best shown in FIG. The two sections of paperboard material are then bonded together connected by applying any known one Glue or adhesive. Preferably they are connected to one another along the serrated edges.

Reference is now made to Figure 1 of the drawings. There is one in accordance with the method of the present invention produced tear edge shown, which a first cardboard section 12 with a line of teeth 14, which a forming a first serrated edge 16 and having a second paperboard portion 18 containing a line of teeth 20, which form a second serrated edge 22. These two sections are about two fold line segments 24 at opposite one another Ends of the sections folded and held securely in place by some adhesive material 26. In addition, the teeth have been impregnated with sprayed polyurethane to make them hard, so that they are better Have cutting or ripping performance and a longer service life.

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Making a dispensing carton with the tear edge construction described above can be most beneficial can be achieved using a method explained above, since the tear-open edge and the carton blank can be made together from a single piece of material. For example, if you cut a cardboard box separates and also provides this with a lower front wall, bottom wall, rear wall, upper wall and upper front wall, which are separated from one another by fold lines, the tear-open edge can be achieved by adding an additional Material length provided by suitable fold lines or fold line segments with one or more of the walls connected is. By punching out the cardboard material along the fold line between this additional length of material or The flap and the wall it is attached to will be the jagged edges that will eventually form the tear-open edge, manufactured.

For example, a dispensing carton with an integral tear edge construction can be made in accordance with the present invention can be produced by first selecting a piece of cardboard material from the cardboard blanks that are in the Figures 2 through 7 are shown.

Reference is now made to FIG. The cardboard blank 44 shown has a bottom wall, a back wall, and a top wall and upper front wall 36, 38, 40 and 42 and a lower front wall 32 and tab 34 attached to the wall along fold line segments 24a is attached. As is readily apparent, a single jagged line 46 in the blank 44 can be between the fold line segments 24a are separated or punched out. In addition, the upper front wall 42 is in two Sections 42 'and 42 "are divided by a slit embossed line 47 along their portion that defines these two Separates sections from each other.

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Reference is now made to FIG. 3. The blank 48 has the usual lower front wall, bottom wall, rear wall, upper wall and upper front wall 32a, 36a, 38a, 40a and 42a, respectively, and a tab 50 which is connected to the upper front wall 42a along fold line segments 24b. Here too, as in the case of the blank 44 explained above, a single jagged line 46a can be cut out or punched out in the blank 48 between the folding line segments 24b. In addition, the lower front wall 32a is in two sections 32a ^! and 32a ″, which are separated from one another over their entire length by a fold line 33.

Reference is now made to FIG. The blank 52 has a lower front wall, bottom wall, rear wall, upper Wall and upper front wall 32b, 36b, 38b, 40b and 42b, respectively. Between the bottom wall and the lower front wall 36b, 32b a flap 54 is switched on, which is connected over its entire length by a fold line 56 to the lower front wall 32b is and further along fold line segments 24c with the bottom wall 36b. There is a jagged one between the fold line segments Cutting line 46b provided. In addition, the flap is provided with a fold line 58, which runs parallel, but at a distance from the fold line 56. The purpose of this second Fold line is to bring the cardboard back wall out toward the front of the carton before wall 32b after is aligned at the top, as shown in FIG.

After the selected cardboard blank has been made, apply the tooth hardening material to the serrated ones Edges are sprayed on and the sections with the tooth lines folded and glued together, the cut is made brought or folded into a flat shape in which it can be easily shipped to the customer. It will now Reference is made to FIG. 5. In the blank 44, the lower front wall flap 34 is folded over and on the inside of the

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the lower front wall 32 is glued along the fold line segments 24a (not shown). Then the cut is made lengthways a fold line 60 is folded between the bottom wall and back wall 36, 38 and the upper front wall 42 "is attached to the lower Front wall 32 is glued at one or more desired locations below the cutting edge 10a. The slotted embossed line 47 tears when opening the box.

Reference is now made to FIG. The upper front panel flap 50 is preferably folded under and attached to the inner surface of the upper front panel 42 to form the tear edge 10b. The blank is further folded along fold line 60a, and the upper end portion 32a "of the lower front wall is folded over and along the line 33 and glued to the inside of the upper front wall. The flap 50 of the front wall 32a ^f at the portion 32a at various Dots are lightly glued along its length, this glue is torn slightly in a conventional manner to open the carton after it has been assembled and filled.

Reference is now made to FIG. The blank 52 is folded along the fold line 60b and the top front Wall 42b is temporarily adhered to lower front wall 34b to facilitate opening of the box. Regarding In this carton, it is noted that the tear edge 10c is exposed in a flat shape during shipping. Training the tear-open edge is done by pulling the tab 54 along the fold line segments 24c (not shown) folds against the inside of the bottom wall 36b. Then the portion of the flap between fold line 58b and the Fold line segments 24c are glued to the wall, while the section between the fold line 56 and the fold line 58 is folded back against itself until it reaches the lower front wall 32b of the front of the carton. Then Finally, a fold is made along fold line 56 in order to

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position the lower front wall so that it is the front of the cardboard box.

As can be seen from FIG. 8, the tear edge 10a. an integral part of the cardboard box 30. The first section 12 a of the cardboard accordingly has the lower front wall 32, and the second section 18 a has a flap 34, which with the wall on the fold line segments 24a (not shown) is integrally connected. The carton also contains the bottom wall, back wall, top wall and front wall 36, 38, 40 and 42 as well as these walls normally associated tabs to complete the box and enclose the material to be dispensed. The box also contains the adhesive 26a and that of the hardening serving cover 28a. The sheet-like material 29 to be separated is pulled down against the tear-off edge 10a.

Reference is now made to FIGS. 9 and 10. In these show a part of each carton which is constructed from the blanks of FIGS. 3 and 4. The box according to Fig. 9 includes the tear edge construction 10b which forms an integral part of its upper front wall 42a and he is in connection with part of the sheet material 29 shown, which is torn up against the edge. The carton of Figure 10 contains the tear edge construction 10c, which forms an integral part of its bottom wall 36b, and it is in connection with part of an arcuate one Material 29 is shown torn back against the edge.

In two of the above-described cartons made by the method according to the invention, one is Tab added in one piece to one of the two front walls and with its adjacent wall along folding line segments on opposite one another Walls of the tab connected. With these cards

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tons is a single jagged line punched into the material, with the flap from the adjacent wall along the zigzag line between the fold line segments is separated. The flap is then preferably longitudinal the fold line segments folded over so that it lies next to the inside of the wall, with two adjacent rows of Teeth are formed, namely one on the tab, the other on the wall. You could also be in the outside of the Wall, but would not be as appealing in this case. In any case, the teeth are in everyone Row staggered between the teeth of the other row. This doubles the number of Teeth, and since each tooth can be made larger in this way, the strength of the tear-open edge is increased. In addition, each tooth lies next to two teeth in the adjacent row and helps support the same.

To ensure that the teeth in both rows of the tear bar are at the same height with respect to the Fold line segments lie, the jagged dividing line in the material is designed so that a line through the center of the punching tool runs through the tips on the cardboard that contain the fold line segments. If against it if it is desired to raise one tooth line with respect to the other, the fold line segments can be closer to the tips be advanced from one set of teeth than the other to achieve this.

Further modifications in the methods described above can be carried out within the scope of the present invention will.

It is desirable for any dispensing carton that the tear-open device 10 to close to the ends of the cardboard so that the sheet-like material to be separated is not

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is noticeably wider than the tear-off device 10 itself. Thus, it is the fold line segments that stiffen the two Connect arcuate material sections of the device in one piece with one another, preferably narrow compared to the Total length of the device itself. To facilitate dispensing of the paper or any other material from the box, the width of the paper is usually slightly smaller than the inside dimension of the box. That difference is a measure of the preferred length of the fold line segments.

In order to facilitate understanding when explaining the present invention, one has in connection with one or the other reference number uses the letters a, b and c which represent the same part of the blank or carton in each embodiment. So one has the tear-open edge construction per se by the reference number 10 characterized, while in the preferred second and third embodiments of the carton according to the invention the Edge is marked by the reference numerals 10a, 10b and 10c.

Further additional modifications of the invention, for example with regard to the one-piece connection of the serrated edges along a fold line at the bottom of their respective ones Sections are within the scope of the present invention.

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Claims (16)

Claims Process for producing a tear-open edge structure for separating wrapping material or the like from a supply of this material,
characterized by punching a jagged line in a piece of paperboard material to form first and second sections, each of said sections having a tooth line between its ends forming a jagged edge and the sections being integrally connected along fold line segments at opposite ends of the jagged edges so that the teeth of one of the sections mesh with the gaps between the teeth of the other section, spraying a tooth hardening material under sufficient pressure on a selected outside of the piece of paperboard material near the jagged edges to cause the tooth -Hardening material penetrates substantially the entire thickness of the paperboard material without noticeably discoloring its opposite outside, folding one of the sections along the fold line segments against the other section so that each tooth of one section between two teeth of the other section po is positioned and connecting the sections together. 2. The method according to claim 1,
characterized in that a polyurethane varnish, silicone or nitrocellulose is used as the hardening material. 3. The method according to claim 1 or 2, characterized in that a polyurethane dissolved in acetone is used as the hardening material is used. 709822/0624 7559292 4. The method according to claim 1, 2 or 3, characterized in that the connecting of the sections together along the jagged edges are made by an adhesive. 5. The method according to one or more of the preceding claims, characterized in, that the piece of cardboard material in which the sections are formed is a cardboard blank with a bottom wall, Has rear wall, upper wall, lower front wall and upper front wall and a tab that is integral with a selected lower front wall, bottom wall and upper front wall is connected, with the first section in a selected one lower front wall, bottom wall or upper front wall and the second section is formed in the flap. 6. The method according to claim 5,
characterized in that the first section is formed in the lower front wall. 7. The method according to claim 5,
characterized in that the first section is formed in the upper front wall. 8. The method according to claim 5,
characterized in that the first section is formed in the bottom wall. 9 8 ^ / 0624 .3 · 9. The method according to one or more of the preceding claims, characterized in, that the jagged punched line is not continuous, so that at least one unpunched portion of the paperboard material along the cut line between the tip of at least one tooth of one edge and the Tip of at least one tooth of the other edge is present and the section approximately in the middle between the tips is arranged. 10. The method according to one or more of the preceding claims, characterized in, that between about four to five teeth per inch (25.4 mm) are punched out in each serrated edge. 11. The method according to claim 3 »
characterized in that the hardening material is sprayed onto the paperboard material under a pressure of about 42 kg / cm to about 56 kg / cm (600 psig to about 800 psig). 12. The method according to claim 11,
characterized in that the hardening material is sprayed onto the paperboard material between about 6.35 mm and about 19 mm (0.25 inches to about 0.75 inches) above the material. 13. The method according to claim 1,
characterized in that the hardening material is sprayed onto the paperboard material while the material is agitated at a rate of from about 3000 m / h to about 6000 m / h (10,000 feet / h to about 20,000 feet / h) relative to the spray source. 70 9 8 2 2/0624 14. The method according to one or more of the preceding claims, characterized in, that the area of the hardening material that is sprayed onto the paperboard material is at least the entire tooth surface covered between the tips of the jagged die cut line. 15. The method according to claim 14,
characterized in that the surface of the hardening material has a width of about 6.35 mm to about 19 mm (0.25 inches to about 0.75 inches) when the hardening material reaches the paperboard material, 16. The method according to one or more of the preceding claims, characterized in that that the cardboard material consists of a strong, bleached sulfate cardboard, which is coated on one side with clay and a thickness of about 0.4 mm to about 0.56 mm (0.016 inches to about 0.022 inches) that the tooth hardening material consists of a polyurethane dissolved in acetone that the hardening material is applied to the cardboard material under pressure ρ ρ between about 42 kg / cm to about 56 kg / cm (600 p.s.i.g. to about 800 p.s.i.g.) spaced between about 6.35 mm to about 19 mm (0.25 inch to about 0.75 inch) above the paperboard material is sprayed on while the cardboard material at a speed between about 3000 m / h to about 6000 m / h (10,000 feet / h to about 20,000 feet / h) is moved with respect to the spray source and that the area of the spray is at least covers the entire tooth surface between the tips of the jagged die cut line and along the sections the jagged edges are bonded together with an adhesive. 709822/0624