DE6810693U - PACKAGING CUT-OUT MADE OF HEAT SEALABLE MATERIAL OR COATED WITH IT, AND DEVICE FOR PROCESSING THE CUTTING-OUT - Google Patents

Description

Packaging blank made from heat-sealable Material consists or is coated with it

The innovation relates to a packaging cut made of heat-sealable material or is coated with it and aims to create a cardboard blank, which is used both when erecting even when closing the box by means of a device provided for this purpose in a simple and can be heat sealed reliably. In the following ...

(Port setting page 2 of the original description of December 9, 1968)

the invention is described in this specific context, but it will be understood that the
The principle of the invention can also be used for heat-sealing other forms of packaging, such as polyethylene film or polyethylene-coated metal film.

* When erecting a cardboard blank and welding its parts to form a cardboard box with the help of a die and a stamp
it is known »to direct a jet of hot air against the parts to be welded, so that the heat-sealable coating of the parts concerned, eg
Wax or polyethylene, is heated to a sticky state, whereupon the blank is erected and sealed by means of the punch and the die. A corresponding method is used when closing a filled cardboard box.

There are several disadvantages associated with this method. The time it takes to heat the parts to be welded represents a not insignificant proportion of the total time required for erecting and heat-sealing the box
the process can therefore only be achieved at a relatively slow cycle. Another disadvantage is that the tools are as resourceful as the air supply

Heat the whole thing so strongly that a liquid ■ '■' ■ "'. cooling of the same is required, which makes the device cumbersome and expensive. The production the hot air jet respectively. which "requires hot air jets significant energy consumption, partly to generate the required compressed air, partly to Generation of the heat loss caused by the scattering of the hot air on the surroundings, including the cooled ones Tools, gets lost. Finally, a heat sealing process using a hot air jet is included Sealing of filled cardboard boxes cannot always be used, since the contents of the cardboard boxes can be of such a nature that they can be removed by the hot air jet is affected.

In another known method, which is only (^ used in machinelleh erecting cartons

and in which the cardboard blanks are fed individually from a supply to the die by means of a suction gripper the suction gripper is provided with suction cups, which are intended to be heat-sealed on the blank Place un gripped inside with a filament, which during the promotion of the blank from the supply to the die the relevant points the cut to the required temperature

This method avoids that with the former known methods associated disadvantages, since the heating during the conveying of the blank from the supply takes place to the die and thus does not significantly affect the work cycle. Also are those with the Heating related costs limited. On the other hand, heating by means of filaments offers a significant one

V_) Risk of fire as it is difficult to generate heat

to cope with the filament in such a way that on the one hand the cardboard blanks are heated enough to to enable heat sealing, but on the other hand not be heated so much that the material ignites will. One reason for this difficulty is to be found in the fact that most of the heat-sealable Materials for cardboard blanks have a shiny, reflective surface, which is why the

y ~ N 'filaments produced scattered IR radiation very intensely must be in order within the time during which the gripper is in engagement with the blanks, the necessary To cause heating. The intensity of the radiation impinging on the relevant part of the blank but is not evenly distributed over its area, but is at the highest, those places that are closest to the filament. It can therefore be a Local overheating in connection with another other = - insufficient heating.

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Hanover, May 5, 1969

Re: A 141b / rg - file number »G 68lo693.4 75o2

Applicant: Alexon-Pac AB. Boraas, Sweden

New page -5-

The disadvantages outlined are avoided by the packaging cut according to the present innovation.

The packaging cut according to the innovation, the one made of heat-sealable Material exists or is coated with it and which is intended for welding in pairs Parts is equipped, is characterized in that at least one of two parts to be welded is provided with a thermal radiation absorbing coating. This cutting can be used in conjunction with a device can be used that are swei each other moving parts, e.g. B. has a die and a punch, the device part with a or a plurality of radiant heat sources is provided, one of which is substantially parallel or converging

6S10693

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Emit radiation. This radiation is expediently directed against those places where the
Applying the packaging blanks to the device with heat radiation absorbing
Coating provided parts are located. Through this

(Continued on page 6 of the original description of December 9, 1968)

the packaging parts to be heated receive a relatively uniformly distributed heat radiation, which as a result of the radiation-blocking coating, e.g. a print in black color is absorbed very quickly. It doesn’t need such an intensive one and long-lasting heat radiation as before. In Practice has found that a well-known IR emitter of the said type is capable of the necessary heating of a polyethylene-coated and with local black printing provided cardboard blank tes to do what in less than 1 / IQ of a second corresponds approximately to the time from the attachment of a carton blank to be erected onto a Die by means of a mechanical feeder until the blank is erected in the die by means of of a stamp passes. The heating process . can thus be involved in the start-up process

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be structured so that it has no influence on the work cycle. On the other hand, in certain In cases the work cycle is regulated in such a way that it influences the heating process. This is e.g. this is precisely the case when erecting a cardboard box by means of a die and a stamp, with the cardboard blank applied to the die and then pressed into the same by means of the punch will. If in this case a die with embedded heat radiation sources is used, which are arranged in those places where the

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with heat radiation absorbing coating
provided parts of the flat cardboard blank
the matrix to the concern, come, become at the beginning

of the work stroke of the stamp these parts from the
Heat radiation sources are removed, whereby

their heating is interrupted. So you can f

by regulating the work cycle the duration of the ■,

Regulate the heating period. In the following, the innovation is based on the Drawing explains in more detail in which 1 shows a cardboard blank and, 2 shows an erecting and heat sealing die j

for the blank according to FIG. 1 schematically j

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and show in perspective. ;

The cardboard blank according to FIG. 1 has a rectangular |

igen bottom 1 and four sides connected to it

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de 2.2 and 3.3 , of which the latter with flanges

* - ■ see k provided with the side walls 2 for sealing Ί

are. :

The cardboard blank is in a known way with a!

heat-sealable material, e.g. polyethylene!

or coated on both sides. Furthermore , each side wall is j

2 with two strips of a heat radiation absorbing 1

"■ '■ ' ^: '■ ■ 1

renden coating printed in those places where 'i

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the hot welding of the walls 2 and the flanges k J

has to take place. The absorbent coating

can be arbitrary for the purpose of a suitable quality

and consist e.g. of black printing ink. , · '

The die according to FIG. 2 consists of a flat block 6 with a rectangular recess 7 »the in terms of shape and size corresponds to the bottom 1 of the cardboard blank. In connection with the end edges the recess, namely at the points where the heat radiation absorbing coatings 5 «Come into play when the cardboard blank is attached to the die with its base above the recess 1 is, are stored in block 6 heat radiators 8, one of which to illustrate their Training is shown in part in section.

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Each radiant heater 8 consists of a box-shaped housing 9 »i ⁿ which a between the end walls of the housing extending Io incandescent body is arranged. The incandescent body is enclosed by an essentially U-shaped profiled reflector 11, preferably with a gold coating. The edges of the reflector are so close together that between them a

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opposite'dem the incandescent body Io directly umschlies-. send space to form somewhat narrowed slot-shaped opening 12, the width of which corresponds essentially to the width of the thermal radiation-absorbing coatings 5 of the Kar tonschnittes. This design of the reflector results in a converging radiation with mainly borrowed uniform radiation distribution over the } zen area of the reflector opening 12

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- of this kind are known. They call in general

Air cooling by means of an air stream that is passed through the housing 9 between the latter and the reflector 11 will. Connections for such air cooling are not shown in the drawing. Pie cooling performance can be kept relatively low if. the radiant heaters work intermittently.

When erecting the cardboard blank according to FIG. 1 by means of the die described, the blank is by means of a known mechanical feeder on the die with the bottom 1 above the recess 7 and with the thermal radiation-absorbing coatings 5 applied over the slot-shaped reflector openings 12. When it is fed to the die, the cardboard blank activates a microswitch (not shown) that controls the current , '"for the incandescent body Io closes, whereby the with

the absorbent coatings are an instantaneous heating of the "heissverschwexssbaren coating 5 provided Stelllen of the carton blank If then a not shown plunger is moved downward against the die and the carton _blank; *. presses through the recess 7, the side walls are erected 2 and 3, and the flanges k are bent towards the areas of the walls 2 heated to the welding temperature and connected to them.

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As already mentioned, the heating of the areas 5 stops in your moment as the walls 2 are opened and thereby removed from the heat radiators 8. The stamp or the cardboard blank can therefore too At this point, actuate a microswitch that interrupts the power supply to the incandescent bodies Io.

> C Furthermore, safety equipment can be provided,

to prevent overheating of the carton blank. This security equipment can e.g. consist of a known smoke detector exist, which turns off the even with a very weak smoke development Causes incandescent body.

It goes without saying that the innovation is by no means limited to the example shown and described. "In this way, the radiant heaters can take place in the case of erecting matrices to be embedded in the die in the manner shown on the drawing, also above it

be arranged, possibly in a certain

I.
Distance by with a reflector training like the

shown the radiation intensity within a relative to a certain distance from the radiant heater remains constant. The number of heat emitters and heat-radiation-absorbing coatings depends on the type of packaging and reflector.

6 9 3

Claims (5)

I · t · t lit t · »II It · · 1 II · · I I · I I I I Hanover, the May 5th 1969 Re. " A I4lb / rg - File number: G 68I0693.4 75o2 Applicant s company Älexon-Pac AB Bor aas, Sweden ... New right to protection Packaging blank, which consists of or is coated with a heat-sealable material, and which contains Equipped to weld certain parts in pairs is, characterized in that at least one of two parts to be welded (2 and 4) is provided with a heat radiation absorbing coating (5).