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Title:
PROCESS FOR MAKING CONTAINER HOLDING STRAPS AND PRODUCT OBTAINED THEREWITH
Document Type and Number:
WIPO Patent Application WO/2019/122980
Kind Code:
A1
Abstract:
The invention relates to a process for making a strap for transporting superimposed plane containers, comprising a step during which polyethylene films (Fi, Fs) are unwound from corresponding reels (Bi, Bs) and moved forward, a step during which the front edge of the upper film is lifted, a step during which two handles (Mi, Ms) are applied, one to said front edge of said upper film and a corresponding one to the front edge of the lower film, and wherein at least one device (Ts) is used which is suited to cut and heat seal said two superimposed upper and lower films (Fi, Fs). The invention also relates to the product obtained therewith.

Inventors:
GRIGOLON, Paolo (Via dell'Industria 13, San Martino Di Lupari, 35018, IT)
Application Number:
IB2017/058277
Publication Date:
June 27, 2019
Filing Date:
December 21, 2017
Export Citation:
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Assignee:
ALPI SRL (Via dell'Industria 13, San Martino di Lupari, 35018, IT)
International Classes:
B29D29/00; B31B70/00; B65D71/14
Domestic Patent References:
WO2013011358A12013-01-24
WO2010105968A12010-09-23
Foreign References:
US20040164575A12004-08-26
EP0687633A11995-12-20
Attorney, Agent or Firm:
BENETTIN, Maurizio (Ufficio Veneto Brevetti Srl, Via Sorio 116, Padova, 35141, IT)
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Claims:
CLAIMS

1. Process for making a strap for transporting superimposed plane containers, characterized in that it comprises the following steps:

- unwinding and moving forward the films (Fs, Fi) made of polyethylene or another plastic material which are held in at least two reels (Bi, Bs);

- lifting the front edge of the upper film (Fs);

- applying the ends of two tapes arranged in such a way as to form an arc in order to obtain two handles (Ms, Mi), a handle on said front edge of said upper film (Fs) and a corresponding handle on the front edge of the lower film (Fi),

and in that it comprises a transverse cutting and heat sealing device (Ts) for cutting and heat sealing said two superimposed upper film (Fs) and lower film (Fi), positioned in such a way that the cut and the seal (S) obtained on the rear edges are at such a distance from said front edges that the sum of the lenghts of said films is equal at least to the width of said containers summed to the thickness of one or more containers and the respective connection sections.

2. Process for making a strap for transporting superimposed plane containers according to claim 1, characterized in that it comprises a step during which the film/films (Fs, Fi) is/are unwound from said at least two reels (Bi, Bs) and made advance on a sliding surface.

3. Process for making a strap for transporting superimposed plane containers according to claims 1 and 2, characterized in that it comprises a step during which one or more edges are heat sealed.

4. Process for making a strap for transporting superimposed plane containers according to claims 1, 2 and 3, characterized in that it comprises the at least partial rotation of the front edge of the upper film (Fs), the application, through heat sealing of their ends, of two tapes (Ms, Mi) arranged in such a way as to form an arc, the first one onto the lifted upper film (Fs), in proximity to the front edge (A2), the second one onto the lower film (Fi), always in proximity to the corresponding front edge (A2) of the lower film.

5. Process for making a strap for transporting superimposed plane containers according to claims 1, 2, 3 and 4, characterized in that it comprises devices for cutting the side edges of the film or films made of a plastic material.

6. Process for making a strap for transporting superimposed plane containers, characterized in that it comprises the following:

- the step of unwinding and advancing said films (Fs, Fi) made of polyethylene or another plastic material from said at least two reels (Bi,Bs);

- the use of a transverse cutting and heat sealing device (Ts) for cutting and heat sealing said two superimposed upper film (Fs) and lower film (Fi), positioned in such a way that the cut and the seal (S) obtained on said rear edges are at such a distance from said front edges that the sum of the lenghts of said films is equal at least to the width of said containers summed to the thickness of one or more containers and the respective connection sections;

- the use of devices for making holes in said films in order to obtain two handles (FM) suited to be used for holding said strap.

7. Strap for holding containers of food items that need to be carried in horizontal position, characterized in that it is obtained through the process according to claims from 1 to 6.

Description:
PROCESS FOR MAKING CONTAINER HOLDING STRAPS AND PRODUCT OBTAINED THEREWITH

DESCRIPTION

Devices are known which are used for transporting boxes containing food items that need to be carried in horizontal position, such as just baked pizzas, and in particular straps are known which are used for transporting boxes containing food items, such as pizzas, cakes, etc., while keeping them in horizontal position.

Just baked pizzas are introduced in boxes made up of a sheet of food cardboard, cut and bent for the purpose described above. These boxes are usually transported using one hand, or both hands if they are very large or heavy.

When several boxes must be transported together, these are stacked on one another in such a way as to form a pile, which makes it consequently difficult to keep them in horizontal position without letting them fall or slide.

If the content of the box or of the stacked boxes is hot, it is quite uncomfortable or even impossible to transport it/them with one hand or with both hands in contact with the bottom of the single box or of the lower box of the pile.

Paper bags with square bottom are known which are used for transporting square boxes in horizontal position.

These paper bags pose several drawbacks, including their high production cost which is due both to the raw material used and to the processing cycles needed to form the various parts of the bag and glue them together.

The subject of the present patent is a new process for making straps suited to be used for transporting substantially plane food containers, individually or stacked on one another, which must be kept in horizontal position during transport.

It is one object of the present invention to develop a process for making the new strap with reduced production costs.

It is another object of the present invention to develop a process for producing the new strap with just a few simple operations.

Said specific production process comprises several steps.

The process includes a first step, during which the following are used:

- at least one storage unit with at least two reels, each holding a film made of a plastic material, such as polyethylene or other suitable products, the height of said reels being equal to the width of the strap to be obtained;

- devices for unwinding said films from said at least two reels, and wherein a first film is superimposed to a second film having the same width;

- devices for moving said at least two films forward on an advance surface.

The second step includes the following operations:

- transverse heat sealing of said two superimposed upper and lower films, at such a distance from the front edges of said films that the sum of the lengths of said films is at least equal to the width of said containers, summed to the thickness of two or more containers and of the respective connection sections;

- simultaneous or successive cutting of the two films, wherein the cut obtained is positioned immediately before said seal.

The successive step includes:

- the use of devices for holding, for example by suction, and lifting the upper film in proximity to the edge obtained from the cutting operation just performed during the first step; - the rotation, at least partial, of said edge of the upper film;

- the use of devices for applying and fixing, through a heat sealing operation, the ends of two tapes arranged so as to form an arc, the first one onto the lifted upper film, in proximity to the front edge, the second one onto the lower film, always in proximity to the corresponding front edge. Successively the band obtained in this way, once the edge of the upper film has been lowered and re-positioned on the lower film, will advance towards a device intended to move it forward for the packing step.

Alternatively, according to the invention, only one tubular polyethylene film may be used, and its side edges may be cut in order to obtain two distinct and superimposed films, always in order to obtain said strap.

Alternatively, according to the invention, the handles may not be obtained through the application of said tapes, but through the execution, for example by means of a die cutting operation, of two holes, one per each film, in proximity to the edges, wherein said holes should be sufficiently large to allow the user to introduce his/her hands therein.

A practical embodiment of the invention is illustrated in the attached drawings by way of example without limitation.

Figure 1 shows the functional diagram of said process and the various essential components used.

There are two reels (Bi, Bs), placed side by side or on top of each other, each holding a polyethylene film (Fs, Fi), wherein said two films, the upper one (Fs) and the lower one (Fi), are superimposed and moved forward through the advance devices (A), and wherein the two films (Fs, Fi) are successively cut and heat sealed through a convenient cutting and heat sealing device (Ts). Owing to the action of said advance devices (A), the two superimposed films (Fs, Fi) reach the lifting device (S), which is suited to lift, for example by suction, the upper film (Fs); the terminal portions of two tapes intended to be used as handles (Ms, Mi) are successively applied to the films through two or more heat sealing devices (TM).

Figure 2 shows the container holding strap that has been obtained, comprising the two handles (Ms, Mi), the front edges (A2), the centre seal

(R) made with the heat sealing device (TS), while Figure 3 shows the same strap in the variant provided with holes (FM) suited to be used as handles. These are the schematic outlines which are sufficient to the expert in the art to carry out the invention, consequently during the production process variants may be developed which do not affect the substance of the innovative concept introduced herein.

Therefore, with reference to the above description and the attached drawings, the following claims are expressed.