DE2925159A1 - Plastic laminate container - with tear strip of same three layer material bonded across partly perforated access - Google Patents

Abstract

A container for fluids or pastes which is to be opened for the insertion of a straw or to empty it is pref. made of laminated material, with an outer layer of polyester, cellophane or polypropylene, a middle layer of aluminium foil and an inner layer of polyethylene. A circular cut pierces the two outer layers for the ultimate access hole, and a tear strip of the same laminate is joined across it so as to join up the two polyethylene layers. A convex tool is used to join the tear strip to the container in a dimple. Arrangement eliminates any contact of the contents with adhesive or metal and ensures clean and neat access without any need for extra careful handling.

Description

Openable bag and method of making it

position Bag with opening option and procedure for its manufacture The present invention relates to a pouch, in particular a stand-up pouch which has an opening possibility for partial opening, e.g. Inserting a drinking straw or opening it completely to remove the product Is provided.

The invention also includes a method of making the pouch.

In addition to bottles and cans have in recent times in particular stable bags for filling with liquid or pasty goods prevailed. Such a stable bag is described in DE-PS 12 81 140, for example. In addition to the opening of the bag by cutting off the upper sealing point or one Corner is provided for some of these bags, e.g. with a tinker straw to push in the side wall and thereby remove the content.

However, since the bags are preferably made of laminates, especially those with metal foils, such as aluminum, pushing them in is often difficult connected, since the relatively thin drinking straws break off or bend and then can no longer be used.

However, if the puncture movement is too violent, it can occur in inexperienced persons It also happens that both bag walls are pierced and the contents out leaks from the bag.

There are bags known that have a removal opening through an adhesive strip or by sealing a strip on the outside the Bag wall are closed. Has this type of closure of the removal opening however, significant disadvantages if the pouch is made of laminates. The filling namely comes into constant contact with the edges of the individual film layers at the punching point Contact. This creates an attack on the adhesive of the laminate or at Use of composite foils with metal layers on top of them. This can lead to delamination and thus lead to the destruction of the bag. Furthermore, the contents can be affected by the attack on the adhesive or the metal foil become unusable.

From DE-GM 75 26 045 a bag is known which has a puncture site having, wherein the puncture site by a punch running from the outside to the inside is formed, but only up to the inner sealing layer of the film laminate penetrates.

Even if this is already an improvement in terms of the possibility of opening the bag could be achieved, as only the inner layer pierced had to be, it could still happen, especially with inexperienced people, that is pushed past the relatively small puncture site and thus to the previously indicated disadvantages comes.

The task was thus to create a bag, the one has closed removal opening, which is easy and safe to remove the product can be partially or fully opened and at the same time the attack described on glue or metal is reliably prevented.

The above-mentioned object is achieved according to the invention by a pouch with an opening option, formed from a film laminate, wherein the inner side facing the filling material made of a sealable one material consists and one through the outer bag wall up to or into the inner one Sealing layer running stamping or an incision is present, its The distinguishing feature is that this punch or incision channel the sealing layer of the bag with a sealable tear strip or with the Sealing layer of a tear strip consisting of a laminate is sealed.

It has surprisingly been found that the inventive Bag light and clean partially e.g. for inserting a drinking straw or also can be opened completely for the removal of pasty or solid products, for example, if the pulls the tear strip away from the bag wall upwards and to the side.

The bag thus once has the advantage that the contents do not comes into contact with adhesives or metals in the laminate, causing delamination and on the other hand without the use of aids, e.g. scissors, knives can be opened cleanly and in a defined manner, among other things. So it can also be done by inexperienced people not for splashing, spilling or leaking of the product when opening the Bag come.

Even if the punching or the incision on all laminates with Advantageously can be attached to form the channel over which the sealing layer of the bag is connected to the tear strip, so it has to be especially at Proven bags, which consist of a three or. Four-layer film, e.g. made of polyester-aluminum-polyethylene, Cellulose-aluminum-polyethylene or polypropylene-aluminum-polyethylene exist.

The punching or the incision can have any shape per se sit, such as circular, oval, jagged or angular, V-shaped, semi-circular, Y-shaped or similar. In practice a partial opening, e.g. to insert a Drinking straws, but a circular punching is best.

For a complete opening of the bag, a linear one is preferred Puncture or incision channel made over the completely or only partially Tear strip is sealed with the sealing layer of the bag film.

The punching channel is preferably located at the bag ends.

In order to save material for the tear strip, it is preferred only partially over the punching or incision channel with the sealing layer of the bag film connected, while the puncture or puncture channel preferably from one to the opposite The sealing edge of the bag runs. When pulling up and laterally removing the tear strip the channel serves as a guide when opening, so that a clean, defined opening line is achieved. It is mainly used for the removal of larger products, however provided that there are two channels arranged at a defined distance, e.g. in parallel are over which both, preferably partially, the tear strip with the sealing layer the bag film is connected.

When tearing open, according to the lines of the Channels, an enlarged opening.

The depth of the puncture or incision channel can be selected as desired as long as the requirement is met that the bag wall is not completely severed will.

The width of the punching or incision channel can be arbitrary be, however, punching widths of up to 1/10 mm in the Very well proven in practice. To make the punch or the incision Usual tools used, e.g. adjustable punching tables ~ heated punches or the like.

The opening possibility according to the invention is in itself not specific Tied in the form of a bag, however, it has proven particularly useful in stand-up pouches, in particular such as are described in DE-PS 12 81 140, proven.

All sealable films can be used for the tear strips, however, laminates are preferred because they will seal together with the sealant layer deform the bag film less easily than monofilms. It can e.g. the same laminates are used as for the bags. However, it should be special care must be taken that the foils for the tear strips are as flexible as possible are, because with highly inflexible foils, the tear strips get caught in bundle packs packed bag and unintentional opening during removal could.

The present invention also relates to a method of manufacture of the bag with the possibility of opening, whereby one at least one place The bag wall preferably stands little above the later filling level of the bag makes a punch or an incision, punching so deep or cuts in that the outer laminate layer (s) up to or into the inner one The sealing layer is penetrated, but this sealing layer does not penetrate completely, whose distinguishing feature is that you can punch the generated or Incision channel wholly or partially with a tear strip made of sealable material Material or a tear strip made of a laminate with a sealable layer loading covers the tear strip using heat and pressure the punching or incision channel is sealed with the sealing layer of the bag film, whereby the punching or incision channel during the sealing on the sealing layer or bag film is elastically supported.

In this process, the tear strip is attached to the finished bag with the inner sealing layer of the bag, mun the elastic support are inserted into the bag opening and care is taken that a There is no sealing with the opposite wall of the bag.

In order not to be exposed to these conditions, a Method preferred in which the opening option is attached to the bag film, before the bag is shaped accordingly by applying sealing seams.

That alternative is a method of making one Bag with opening option, whereby at least one point of a bag film, preferably at least one above the later filling level of the later bag Punching or an incision attaches, where you punch so deep or cuts in so that the laminate layer (s) penetrates up to or into the sealing layer is, however, does not completely penetrate this sealing layer, its characteristic feature consists in the fact that the punch or incision channel generated is wholly or partially with a tear strip made of sealable material or a tear strip of a laminate covered with a sealable layer and by means of heat and Print the tear strip over the punch or incision channel with the sealing layer the bag film sealing, whereby the puncture or incision channel elastically supported on the side of the sealing layer, then to form the Bag, the bag film provided with the tear strip with the sealable one Laying layers on top of one another and attaching sealing seams or the one with the tear strips provided bag film on another sealable film that does not have a tear strip is provided, hangs up and attaches sealing seams.

It was very surprising that after the procedure about the nevertheless relatively very narrow channels a good seal could be achieved, otherwise Seals can only be made over relatively broad areas such as the manufacture of sealed edge bags.

The sealing tools for connecting the sealing layer of the bag film with the sealing layer of the tear strip can be shaped as desired and accordingly be shaped like the punch or incision channel, but they should be slightly larger can be held as the punching tool.

In the case of circular punchings, it has proven to be advantageous that The sealing tool has to be convex in the sealing area.

Suitable for elastic support of the sealed side of the bag film all materials that are elastically deformable and after the sealing process return to their original shape. These include, for example, rubber, Foams, etc.

Depending on the pressure, heat, sealing layers and other criteria you can Materials with different Shore hardnesses for the execution of an optimal sealing Find use.

The invention is explained in more detail with reference to Figures 1 to 3, However, there is no restriction to the embodiments shown target.

Fig. 1 shows a section and a plan view of a bag film section. In the laminate consisting of layers 1, 2 and 3 there is the punch or cut channel 4 can be seen, which extends into the sealing layer 3.

Fig. 2 shows the convex front part of a heated sealing tool, which is preferably used for sealing circular punches. For technical reasons of the drawing, the representation of the heating was omitted.

Fig. 3 shows an enlarged section with a bag film section the layers 1, 2 and 3, the sealing layer 3 with the sealing layer 8 of the from the laminate layers 6, 7 and 8 existing tear strips over the punch or incision channel 4 is connected. The elastic support is denoted by 9. The sealing pressure tool was omitted for technical reasons.

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Claims (9)

Bag with opening option, formed from one The inner side facing the filling material is made of a sealable material consists and one through the outer bag wall up to or into the inner one Sealing layer running stamping or an incision is present, thereby characterized in that the sealing layer is via this punching or incision channel (4) (3) the bag with a sealable tear strip or with the sealing layer (8) a laminate tear strip is sealed. 2. Bag according to claim 1, characterized in that it consists of a Consists of three-layer laminate, which from the outside inwards is made of polyester, cellulose or polypropylene-aluminum-polyethylene. 3. Bag according to one of claims 1 or 2, characterized in that that the punching or incision channel (4) has a circular design. 4. Bag according to one of claims 1 or 2, characterized in that that the punching or incision channel (4) has a linear design and at or near the top edge, above the later fill level of the bag is appropriate. 5. Bag according to claim 4, characterized in that the seal with the tear strip over the punch or incision channel (4) only partially is executed. 6. Bag according to one of claims 4 or 5, characterized in that that the punch or incision channel (4) is preferably parallel to another punch or incision channel is assigned. 7. Bag according to one of claims 1 to 6, characterized in that that it has a stable floor. 8. Method of making an openable pouch according to one of claims 1 to 7, wherein at least one point of a Beutzlwandung preferably at least one punching above the later filling level of the bag or make an incision, where you punch or cut so deep, that the outer laminate layer (s) up to or up to the inner sealing layer is penetrated, but this sealing layer does not completely penetrate, characterized in that that the generated punch or incision channel wholly or partially with a Tear strip made of sealable material or a tear strip made of one Laminate covered with a sealable layer and denied by means of heat and pressure Tear strips are sealed over the punching or incision channel, whereby the punching or the incision channel is elastically supported on the sealing layer side. 9. Method of making an openable pouch according to one of claims 1 to 7, wherein at least one point of a bag film, preferably at least one above the later filling level of the later bag Punching or an incision attaches, where you punch so deep or cuts in so that the laminate layer (s) penetrates up to or into the sealing layer is, but does not completely penetrate this sealing layer, characterized in that that the punch or incision channel generated is wholly or partially with a tear strip made of sealable material or a tear strip made of a laminate with a cover the sealable layer and apply heat and pressure to the tear strip the puncture or incision channel seals, whereby the puncture or incision channel elastically supported on the sealing layer side, then to form the bag the pouch films provided with the tear strip with the sealable layer placed on top of one another and attached sealing seams or the one provided with the tear strip Pouch film on another sealable film that does not have a tear strip is provided, hangs up and attaches sealing seams.