Closure assembly in a bag

Closure assembly in a first bag Technical Field The present invention relates to the field of packaging bags.

The present invention particularly relates to a method of manufacturing a bag including a closure component, especially a closure component of an apparently damaged type.

BACKGROUND OF THE INVENTION Many packaging bags and many devices for manufacturing these packaging bags have been proposed, especially devices for fixing to a bag closure member including a device of an apparently damaging type.

Figure 1 shows an embodiment of a known closure assembly 1. It includes complementary sections 2 for opening and closing the bag opening 3. The complementary section 2 is advantageously opened or closed by means of a movable slider 4.

The device that provides initial protection and the opening indicator function can also be seen in Figure 1. It consists of a strap 5 that extends through the bag opening in the initial state and must be broken to gain access to the bags containment Things.

Obviously, the damaging device 5 itself is well known and allows the user to know whether the bag containing the product has been opened. The fixing plate 6 allows the complementary section to be fixed to the 20' side wall 7 of the bag.

The fixing plate 6 is fixed during the welding process, during which the fixing plate passes between the welding clamps 8. A lot of research has been conducted in this very special field, but the various existing ways of fixing the fixing plate to the opening of the bag are not completely satisfactory.

Specifically, the fixing plates cannot be welded together, nor can they be welded to devices that are obviously damaged.

Therefore, it is necessary to provide an intermediate portion 9 between the inner surfaces of the fixing plates in order to allow the apparently damaged device 5 to be positioned correctly, or to prevent the fixing plates 6 from being welded together.

An example of such a known bag is described and shown in the document FR2 778 362.

03806676.9 Summary of the invention The present invention proposes to improve the device for fixing the fixing plate to the surface of the bag.

In particular, it also mentions the closure part, which is obviously not composed of a plate that includes a line of weakness.

To this end, the present invention proposes a closure assembly, including complementary closure sections, and a fixing sheet for fixing the closure assembly to the inner surface of the bag, characterized in that it includes:

-Welding strips arranged on the outer surface of the fixed plate;

-A score or line of weakness is formed in one of the fixing plates, the score or line of weakness defines the fixing plate as a first outer part and a second inner part, and the outer welding strip provided on the fixing plate is defined On its external parts;

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

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

-The external welding strip of the fixed plate without nicks extends over the entire width of the fixed plate;

-The external welding strip of the fixed plate without nicks only extends on the external part of the fixed plate;-The closed section is an embedded/embedded complementary section;

-The closed section includes a movable slider.

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

BRIEF DESCRIPTION OF THE DRAWINGS Other features, objects and advantages of the present invention will be seen from the following description, which is exemplary and non-limiting, and must be understood with reference to the accompanying drawings.

-Figure 1 schematically depicts the prior art bag that has been discussed above, including a closure assembly with a pattern of weakness that is clearly to be damaged;

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

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

-Figure 4 depicts the closure assembly of the present invention, where the apparently damaged element has been opened

03806676.9 first start;

-Figure 5 depicts an embodiment in which the packaging bag is filled after the closure is fixed;

-Figure 6 depicts a closure assembly in which the fixing strip is located on the opposite fixing plate of the embodiment described in Figure 2; and

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention relates to a manufacturing method on an automatic assembly device for closing a closable bag, the bag comprising a closure assembly having a fixing plate for forming an apparently damaged device.

The invention can be applied to an automatic bag making machine with horizontal movement, and can also be applied to an automatic bag making machine with vertical movement.

In addition, the present invention can also be applied to an automatic bag making machine that performs filling after manufacturing and possibly during a step that is positionally separated from the manufacturing position, as well as to 15 single positions and during successive steps. Closed, "form, fill and seal" (FFS) type production equipment according to commonly used British terminology.

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

Figure 2 schematically depicts the closure assembly lo of the present invention. The assembly includes a complementary section 2 that allows the opening and closing of the bag opening.

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 be advantageously designed as an embedded/embedded section. However, it can also be designed as other types of complementary cross-sections.

The fixing plates 6a and 6b support the section 2 and allow them to be fixed to the side wall 25 of the bag.

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

By analogy, in the context of the present invention, for the fixing plate 6b, the first part 61b 30 is referred to as an "external part", and the second part 62b is referred to as an "internal part".

In the description of the present invention, "welding strip" means including fixing a fixing plate to the bag

03806676.9 All possible ways on the first side wall, such as, for example, thermal welding, especially "hot-melt" type welding, but also adhesive bonding.

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

On the contrary, there is no welding strip on the inner surface of the part 61a. The same is true on the inner surface of the part 61a. Therefore, the inner surfaces of the parts 61a and 61b cannot be welded together. In a modified embodiment of the present 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 a surface treatment process known to those skilled in the art.

The inner surface of the part 62b is covered with a welding strip 12, which faces the part 62a covered with or not covered with 10 welding strips₀Advantageously, the component 62a does not include a welding strip, which can save welding materials and allow relatively clean welding. Of course, the welding rod may be fixed to the part 62a instead of being fixed to 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, the parts 62a and 62b can be welded to each other during the process of passing the closure assembly between the welding guide plates.

The purpose of the welding is to form an element that is obviously to be damaged, which acts as an indicator when it is first opened.

The outer surface of the fixing plate 6b is covered with a welding strip 13, which can fix the fixing plate 6b to the inner surface of the bag.

Figure 3 schematically depicts the upper part of a bag 20, the mouth 20 of which includes the one-in-one assembly 1 of the present invention at the opening 3 thereof. The fixing plates 6a and 6b are fixed during the welding or adhesive bonding process, during which the fixing plates 6a and 6b pass between the welding or bonding clamps 8.

After welding, the outer surfaces of the fixing plates 6a and 6b are fixed to the inner surface of the side wall 7 of the closable bag 20. Similarly, the thermal welding process welds the inner surfaces of the parts 62a and 62b together. Therefore, the structure of the component 1 is obviously to be closed in a damaged type, and the welding strip 12 is in a sealed state.

Obviously, the breakable closure element can be opened by the user through the notch 10.

FIG. 4 schematically depicts the opening function of the device that is obviously to be damaged after the initial opening, that is, the opening function after the notch 10 is cut.

After the section 2 is opened by the slider 4, the user applies 30 enough force on the fixing plates 6a and 6b to break the line of weakness or score 10. After the line of weakness or score 10 is broken, the component 62a is still welded to the fixing plate 6b, The part 61a is still welded to the wall of the bag 20.

03806676.9 The arrow 21 indicates that the user may have entered the inside of the bag 20. Therefore, the user can open or close the section 2 as desired.

The invention also relates to a method of manufacturing the component 1. According to this manufacturing method, the complementary section 2 is welded to the fixing plates 6a and 6b ±o. The fixing plates 6a and 6b can also be molded in one piece of the 5 section by extrusion.

The scoring is implemented in one of the fixed plates, or the line of weakness 10 is formed in it, which is shown as 6a for clarity of description.

Then, apply welding strips to the fixed plates 6a and 6b ±₀ The welding strip on the outer surface of the fixing plate extends over the outer part of the fixing plate 6a and the entire surface of the fixing plate 6b with respect to the score or line of weakness 10.

The welding strip on the inner surface of the fixing plate extends on the inner part of the fixing plate 6a and/or 6b with respect to the score or line of weakness 10. The inner surface of the outer part opposite to the score 10 does not include any welding strips. Advantageously, only the inner part includes a welding strip.

The complementary section advantageously includes a movable slider for assisting opening/closing. The slider 15 may be made of metal or plastic.

The side wall 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 the opening of a closable bag.

According to this method, the closure assembly is forced to pass through the opening of the bag, which is 20-formed in a manner known per se, and the movement takes place between the welding guide plates. The welding guide plate allows the welding strip to be fixed to the side wall of the bag and the internal parts of the fixing plate to be welded together.

The welding of the fixing plate to the inner surface of the side wall of the bag can be performed on both side walls at the same time, or the first fixing plate can be welded first, followed by various operations, such as filling the bag 25, and then welding The second fixed plate.

The equipment used to manufacture the closure assembly includes a device capable of applying a welding strip to a suitable surface of the fixing plate. In addition, it also includes a device capable of forming a line of weakness or a score on one of the fixed plates.

The device for fixing the closure component to the bag opening includes a device that enables the closure component 30 to pass flush through the opening of the bag, and a device that can weld the fixing component to the side wall between the devices. These devices may specifically include welding guide plates. Mobile device can be portrait

03806676.9 The first moving device or lateral moving device.

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

The operation of filling the bag with the product can be performed at the bag manufacturing position. For example, the filling operation can be performed before the closure assembly is fixed.

Filling is carried out after the component is fixed to the opening of the bag at the same position or at another position, and then a device for welding the fixed component to the side wall of the bag without forming an obvious damaging closure can be provided here .

In this way, filling can be performed through the internal space between the fixed plates.

For example, these devices may include devices inserted between the internal parts of the fixing plate during the welding step. In the description of a modified embodiment of FIG. 5, the welding strips 11 and 13 are applied only to the outer surfaces of the parts 61a and 61b. Therefore, only the external parts are welded initially. Obviously, the formation of damaged parts will be achieved by welding the parts 62a and 62b after the bag is filled.

The bag can be filled according to other variations. For example, a fixing plate can be fixed to the inner surface of one of the side walls of the bag that is obviously to be damaged for bag filling, and then the other fixing plate can be fixed to the other side wall.

In this way, it can be filled through the outside, that is, between the side wall of the bag and the fixed plate.

In addition, it can also be filled through the end of the bag opposite to the opening where the closure assembly is fixed.

The fixture may include a device for performing "hot-melt" type welding. In addition, adhesive bonding jaws may also be included. It should be pointed out that the above description never presupposes the location of the equipment. For example, it can be vertical or horizontal movement, and the closing component can be fixed longitudinally or transversely with the moving direction of the packaging foil.

03806676.9