CN1328126C - Closure assembly in a bag - Google Patents

Abstract

The invention relates to a closure assembly (1) comprising complementary closure sections (2) and panels (6a, 6b) for fixing said closure assembly to the internal faces of a bag. The inventive assembly is characterised in that it comprises: sealing bands (11, 13) which are disposed on the external faces of the fixing panels (6a, 6b); a precut or line of weakness (10) which is made in one of the fixing panels (6a) and which divides said panel (6a) into a first external part (61a) and a second internal part (62a), the sealing band on the panel being limited to the external part of same; and a sealing band (12) which is disposed on the internal face of at least one of the panels, each internal sealing band being disposed on the internal part of the fixing panels.

Description

Closure components inside the bag

technical field

The invention relates to the field of packaging bags.

The invention relates in particular to a method for the manufacture of a bag comprising a closure assembly, in particular of a visibly tamperable type.

Background technique

A number of bags and devices for the manufacture of these bags have been proposed, in particular devices for fastening to bag closures including devices of the obviously breakable type.

FIG. 1 shows an embodiment of a known closure assembly 1 . It comprises a complementary profile 2 for opening and closing the opening 3 of the bag. The complementary section 2 is advantageously opened or closed by means of a mobile slider 4 .

Also visible in Figure 1 is the means for providing the initial protection and the function of the opening indicator, consisting of a strip 5 which, in the initial state, extends through the opening of the bag and which must be snapped off to gain access to the containment inside the bag. things.

The obviously breakable device 5 is known per se and enables the user to know whether the bag containing the product has been opened or not. The fixing plate 6 makes it possible to fix the complementary profile to the side wall 7 of the bag.

The fixing plate 6 is fixed during the welding process, during which it passes between the welding jaws 8 .

Much research has been done in this very specific field, however the various existing ways of securing the plate to the opening of the bag are not entirely satisfactory.

Specifically, the mounting plates must not be welded together, nor welded to a device that would obviously fail.

Therefore, it is necessary to provide an intermediate portion 9 between the inner surfaces of the fixing plates, in order to allow the correct positioning of the obviously destructible device 5, or to prevent the fixing plates 6 from being welded together.

An embodiment of this known bag is described and shown in the FR 2 778 362 document.

Contents of the invention

The present invention proposes an improvement in the means for securing the fastening plate to the surface of the bag.

In particular, it also proposes a closing part, which is obviously of the breakable type and does not consist of a plate comprising a line of weakness.

To this end, the present invention proposes a closure assembly comprising complementary closure sections and a fastening piece for securing said closure assembly to the inner surface of the bag, characterized in that it comprises:

- welding strips arranged on the outer surface of the fixing plate;

- A score or line of weakness formed in one of the fixing plates, said scoring or line of weakness delimiting said fixing plate into a first outer part and a second inner part, an outer welded strip provided on the fixing plate is defined on its external parts;

- Welding strips arranged on at least one inner part of the fixing plate, each inner welding strip being located on said inner part of the fixing plate.

The present invention advantageously adds the following features, which can be adopted separately, or can adopt any technically feasible combination of features formed by these features:

- the outer welded strip of the fixing plate without scoring extends over the entire width of the fixing plate;

- the outer welded strips of the fixing plate without scoring extend only on the outer part of the fixing plate;

-The closed section is an embedded/embedded complementary section;

- The closure section includes a movable slider.

The invention also relates to a bag comprising a closure assembly of the invention, a method and an apparatus for manufacturing a closure assembly and a bag comprising these assemblies.

Brief description of the drawings

Other characteristics, objects and advantages of the present invention will appear from the following description, which is illustrative and non-limiting, and must be understood with reference to the accompanying drawings.

- Figure 1 schematically depicts the bag of the prior art already discussed above, comprising a closure assembly with a clearly intended damage profile comprising a line of weakness;

- Figure 2 schematically depicts the closure assembly of the invention;

- Figure 3 schematically depicts the closure assembly at the position of the opening of the plastic bag;

- Figure 4 depicts the closure assembly of the present invention, in which the obviously perishable element has been opened;

- Figure 5 depicts an embodiment in which the bag is filled after the closure has been secured;

- Figure 6 depicts a closure assembly in which the fixing strips are located on opposite fixing plates of the embodiment depicted in Figure 2; and

- Figure 7 depicts a closure assembly combining the embodiments of Figures 2 and 6 .

Detailed ways

As stated above, the present invention relates to a method of manufacture on an automatic assembly device for closing a closable bag comprising a closure assembly with a fixing plate for forming a device of the obviously destructible type.

The present invention can be applied to automatic bag-making machines with horizontal movement, and can also be applied to automatic bag-making machines with vertical movement.

In addition, the invention is also applicable to automatic bag-making machines where filling is performed during a step after manufacture and possibly at a location separate from that of manufacture, as well as to filling and closing at a single location and during successive steps on "form, fill and seal" (FFS) type production equipment in commonly used British terminology.

Therefore, the invention is preferably and advantageously applied to machines of the FFS type with vertical movement.

Figure 2 schematically depicts the closure assembly 1 of the invention.

This assembly comprises complementary sections 2 that allow opening and closing of the opening of the bag.

The complementary section 2 can advantageously be opened or closed by means of a movable slider 4 . However, the assembly may not include a slider.

The complementary closed section 2 can advantageously be designed as an embedded/embedded section. However, other types of complementary profiles are also conceivable.

Fixing plates 6a and 6b support the sections 2 and allow them to be fixed to the side walls of the bag.

A line of weakness or notch 10 parallel to the section is formed on one of the fixing plates 6a. This notch 10 extends substantially in the middle of the fastening plate 6a. In this way, it divides the fixing plate 6a into two parts: a first part 61a, which is the outermost part of the bag, and a second part 62a, which is the innermost part.

By analogy, in the context of the present invention, for the fixing plate 6b, the first part 61b is called "outer part", and the second part 62b is called "inner part".

In the description of the invention, "welding strip" is meant to include all possible ways of fixing a fixing plate to the side wall of the bag, such as for example heat welding, especially of the "hot melt" type, but also adhesive bonding .

The outer surface of the outer part 61a of the fixed plate 6a is covered with a welding strip 11 . Welding strips 11 can secure the fixing plate 6a to the inner surface of the side wall of the bag.

In contrast, no weld strips are provided on the inner surface of part 61a. The same is true on the inner surface of part 61a. Therefore, the inner surfaces of the parts 61a and 61b cannot be welded. In an alternative embodiment of the invention, the material of the fixing plate is such that the inner surfaces do not adhere to each other during the welding process. The same result can be achieved by surface treatment processes known to those skilled in the art.

The inner surface of part 62b is covered with a welding strip 12, which faces the part 62a, which may or may not be covered with the welding strip. Advantageously, part 62a does not include a weld strip, which saves weld material and allows for a relatively clean weld. Of course, the weld strip could be secured to part 62a instead of 62b. Figures 6 and 7 differ from Figure 2 only in the position of the welding strips on the inside of the fixing plates 6a and 6b.

In this way, parts 62a and 62b may be welded to each other during passage of the closure assembly between the weld guides.

The purpose of this fusion is to create a visibly damaged element which acts as an indicator when it is first opened.

The outer surface of the fixing plate 6b is covered with a welded strip 13 capable of fixing the fixing plate 6b to the inner surface of the bag.

FIG. 3 schematically depicts the upper part of a bag 20 comprising the closure assembly 1 of the invention at its opening 3 . The fixing plates 6 a and 6 b are fixed during a welding or adhesive bonding process, during which the fixing plates 6 a and 6 b are passed between welding or bonding jaws 8 .

After welding, the outer surfaces of the fixing panels 6 a and 6 b are fixed to the inner surfaces of the side walls 7 of the closable bag 20 . Likewise, the heat welding process fuses the inner surfaces of parts 62a and 62b together. Therefore, the assembly 1 constitutes a closure of the type that is obviously damaged, and the welding strip 12 is in a sealed state.

The obviously breakable closure element can be opened by the user through the score 10 .

FIG. 4 schematically depicts the opening function of an apparently destructive device after initial opening, ie after the incision 10 has been cut.

After opening the section 2 by means of the slider 4 , the user exerts sufficient force on the fixing plates 6 a and 6 b to break the line of weakness or score 10 . After the line of weakness or score 10 is broken, part 62a is still welded to the fixing plate 6b and part 61a is still welded to the bag 20 wall.

Arrow 21 indicates that the user may have entered the interior of bag 20 . Therefore, the user can open or close the section 2 as he wishes.

The invention also relates to a method of manufacturing the assembly 1 . According to this manufacturing method, the complementary sections 2 are welded to the fixing plates 6a and 6b. The fixing plates 6a and 6b can also be formed in one piece in section by extrusion.

The scoring is carried out, or in which the line of weakness 10 is formed, in one of the fixing plates, shown as 6a for clarity of description.

Then, welding strips are applied to the fixing plates 6a and 6b.

The welded strips on the outer surface of the fixing plate extend over the outer part of the fixing plate 6 a as well as the entire surface of the fixing plate 6 b relative to the score or line of weakness 10 .

The welded strips on the inner surface of the fixing plate extend opposite the score or line of weakness 10 on the inner part of the fixing plate 6a and/or 6b. The inner surface of the outer part opposite the score 10 does not comprise any welded strips. Advantageously, only the inner part comprises a welding strip.

The complementary section advantageously includes a movable slider for assisting opening/closing. Sliders can be made of metal or plastic.

The side walls of the bag can be made of any material such as plastic, cardboard or paper.

The invention also relates to a method of securing a closure assembly to an opening of a closable bag.

According to this method, the closing assembly is forced through the opening of the bag, which is formed in a manner known per se, the movement being carried out between welding guides. The weld guides allow the weld strips to be secured to the side walls of the bag and the inner parts of the retainer plates to be welded together.

Welding of the fixing plate to the inner surface of the side wall of the bag can be done on both side walls at the same time, or the first fixing plate can be welded first, followed by various operations such as, for example, operations such as filling the bag and then welding the second Fixed plate.

The apparatus for manufacturing the closure assembly comprises means capable of applying the welded strip to a suitable surface of the fixing plate. Additionally, means are included for forming a line of weakness or score on one of the fixing plates.

The apparatus for securing the closure assembly to the opening of the bag includes means enabling the closure assembly to pass flush through the opening of the bag, and means enabling welding the securing assembly to the side walls between the means. These means may in particular include welding guides. The mobile device may be a vertical mobile device or a lateral mobile device.

Upstream of the closure, the device comprises a bag forming device known per se.

The operation of filling the bag with product may be performed at the bag manufacturing location. For example, the filling operation may be performed before the closure assembly is secured.

Filling occurs after the assembly is secured to the opening of the bag at the same location or at another location, where subsequently means are provided for welding the securing assembly to the side wall of the bag without forming a closure of the obviously destructive type .

In this way, filling can take place through the internal space between the fixed plates.

These means may include, for example, means inserted between the inner parts of the fixing plate during the welding step. In a variant embodiment depicted in FIG. 5 , the welding strips 11 and 13 are applied only to the outer surfaces of the parts 61a and 61b. So initially only the outer parts are welded. Obviously the formation of the part to fail will be achieved by welding the parts 62a and 62b after the bag is filled.

Bags can be filled according to other variations. For example, a fastening plate may be fixed to the inner surface of one of the side walls of the bag of a visibly damaged element for filling of the bag, and then another fastening plate may be fixed to the other side wall.

In this way, filling can take place through the outside, ie between the side walls of the bag and the fixing plate.

Alternatively, filling can also be done through the end of the bag opposite the opening where the closure assembly is secured.

The fixture may include means for performing "hot melt" type fusions. Additionally, adhesive bonded jaws may also be included.

It should be noted that the above description in no way presupposes the location of the equipment. For example, vertical or horizontal movement may be the case, and the closure assembly may be fixed longitudinally or transversely to the direction of movement of the packaging foil.

Claims (19)

1. a closing assembly (1) comprises complementary closed section (2), and is used for described closing assembly is fixed to adapter plate (6a, 6b) on the inside face of sack, it is characterized in that this assembly comprises:

-welding rod (11,13) is arranged on the outside face of described adapter plate (6a, 6b);

-indentation or weak line (10), be formed in one of described adapter plate (6a), described indentation or weak line are defined as first external component (61a) and second internal part (62a) with described adapter plate (6a), and the outside welding rod that is arranged on the described adapter plate is limited on its external component;

-welding rod (12) is arranged on the internal part of at least one adapter plate, and each inner welding rod is positioned on the described internal part of adapter plate.

2. assembly according to claim 1 is characterized in that, the outside welding rod of described adapter plate (6b) is not included in the indentation that extends on the whole width of adapter plate.

3. assembly according to claim 1 and 2 is characterized in that, does not comprise that the outside welding rod of the described fixed outer parts (6b) of indentation is only gone up extension at the external component (61b) of described adapter plate (6b).

4. assembly according to claim 1 is characterized in that, described closed section (2) is for embedding/be embedded into the complementary section of type.

5. assembly according to claim 1 is characterized in that, described closed section (2) comprises movable slider (4).

One kind can closed sack (20), be included in itself and go up folding main body, and opening, described closing assembly is fixed on the described opening, described opening comprises complementary closed section, and be used for described closing assembly is fixed to adapter plate on the inwall of described sack, it is characterized in that, comprising:

-welding rod (11,13) is arranged on the outside face of described adapter plate (6a, 6b);

-indentation or weak line (10), be formed in one of described adapter plate (6a), described indentation or weak line are defined as first external component (61a) and second internal part (62a) with described adapter plate (6a), and the outside welding rod that is arranged on the adapter plate is limited on its external component;

-welding rod (12) is arranged on the internal part of at least one adapter plate, and each inner welding rod is positioned on the described internal part of adapter plate.

7. sack according to claim 6 is characterized in that, the outside welding rod that does not contain the adapter plate (6b) of indentation extends on the whole width of adapter plate.

8. according to claim 6 or 7 described sacks, it is characterized in that, do not comprise that the outside welding rod of the described fixed outer parts (6b) of indentation is only gone up extension at the external component (61b) of described adapter plate (6b).

9. sack according to claim 6 is characterized in that, described closed section (2) is for embedding/be embedded into the complementary section of type.

10. sack according to claim 6 is characterized in that, described closed section (2) comprises movable slider (4).

11. a method that is used for the making assembly, described closing assembly comprise complementary closed section (2), and are used for described closing assembly is fixed to adapter plate (6a, 6b) on the inside face of bag sidewalls (7), it is characterized in that:

-in one of described adapter plate (6a), forming an indentation or weak line (10), described indentation or weak line are defined as first external component (61a) and second internal part (62a) with described adapter plate (6a);

-welding rod (11,13) is put on the outer wall of described adapter plate (6a, 6b), the welding rod that is arranged on the described adapter plate that comprises weak line or indentation is limited on its external component;

-welding rod (12) is put on the sidewall of at least one adapter plate in the internal part of described adapter plate.

12. method according to claim 11 is characterized in that, also comprises a step, in this step, a packaged type opened/closed slider is fixed on the described complementary closo section (2).

13. the method that a manufacturing can closed sack is fixed with closing assembly (1) in this sack, this closing assembly (1) comprises complementary closed section and is used for this closing assembly is fixed to adapter plate on the sack, it is characterized in that, comprises the steps:

-formation limits two sidewalls (7) of an opening (3);

-welding rod (11,13) is flushed in described opening be fused on the outside face of described adapter plate on the inside face of the sidewall (7) of sack, one of described adapter plate comprises the indentation or the weak line that can be fractureed when first the unlatching, the outside welding that is arranged on the described adapter plate is defined on its external component;

-product is packed into described sack (20);

-by being arranged on the welding rod (12) at least one adapter plate, the inside face of described adapter plate (6a, 6b) being welded together, welding rod is positioned on the internal part of described adapter plate in each in the described adapter plate.

14. method according to claim 13 is characterized in that, fills sack before closing assembly is fixing.

15. according to claim 13 or 14 described methods, it is characterized in that it comprises a step, in this step, a packaged type opened/closed slider (4) be fixed on the described complementary closed section (4).

16. method according to claim 13 is characterized in that, the welding mode of described welding rod is the welding of " hot melt " type.

17. an equipment that is used for the making assembly, described closing assembly comprise complementary closed section (2), and are used for described closing assembly is fixed to adapter plate (6a, 6b) on sack (20) inside surface of side wall, it is characterized in that:

-being used for making the device of a weak line or an indentation (10) at one of described adapter plate, described weak line or indentation are defined as first external component and second internal part with described adapter plate;

-being used for welding rod (11,13) is put on device on the outer wall of described adapter plate, the welding rod that is arranged on the described adapter plate is limited on its external component;

-be used for that welding rod (12) put on the inwall of at least one described adapter plate and put on the device of the internal part of described adapter plate.

18. one kind be used for making can closed sack (20) equipment, comprise the fixedly device of closing assembly (1), described closing assembly comprises complementary closed section (2), and is used for described closing assembly is fixed to adapter plate (6a, 6b) on the described sack, it is characterized in that, comprising:

-be used to form the device of two sidewalls that limit an opening (3);

-be used for flushing the device of place's welding on the inside face of described sidewall (7) at described opening with being positioned at welding rod (11,13) on the outside face of described adapter plate, indentation or weak line that one of described adapter plate can fracture when being included in first the unlatching, the outside welding that is arranged on the described adapter plate is defined on its external component;

-be used for product is packed into the device of described sack;

-be used for by being arranged on the welding rod (12) at least one adapter plate, with the device that the inside face of described adapter plate (6a, 6b) is welded together, each welding rod in the described adapter plate is positioned on the internal part of described adapter plate.

19. equipment according to claim 18 is characterized in that, comprises carrying out the device that " hot melt " welded-connecting type engages.

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