GB2070564A

GB2070564A - Paper bag

Info

Publication number: GB2070564A
Application number: GB8105592A
Authority: GB
Original assignee: SUPRACOLOR FINANZ AG
Current assignee: SUPRACOLOR FINANZ AG
Priority date: 1980-02-21
Filing date: 1981-02-23
Publication date: 1981-09-09
Also published as: NO810596L; DE8004561U1; CH649262A5; NL8100870A

Abstract

Close to its open end 7, 8 a bag is provided with an adhesive closure consisting of two coatings A, C that stick only on interaction with one another. A first coated strip A is located immediately by the opening on one face of the bag, and a second strip C, which has the same dimensions, is arranged on the other face of the bag, displaced from the opening of the bag by two widths of the coated strip. The bag is sealed by folding twice along folding lines 5, 6 and pressing. <IMAGE>

Description

SPECIFICATION Paper bags The invention relates to a flat bag of paper or other suitable material which can be sealed after folding over the edge portions defining its opening. Bags of this type are used for the mass despatch of similarly shaped articles, for example of trade samples, films and the like. Customary bags of this type are sealed by folding over the neck of the bag once or, even better, twice, making a hole in the ridge thus formed (it is also possible for the hole to be made when the bag is manufactured), and then securing the closure by inserting a metal fastener.

This type of closure is disadvantageous, however, because it is necessary to store separately a supply of fasteners; the fasteners may fall out again and, furthermore, there is a certain risk of injury being caused by their sharp edges.

It is, of course, possible to use an adhesive tape instead of the fasteners, but manipulating this involves much more trouble than using metal clips.

It is an object of the invention to provide a bag of the type mentioned at the beginning in which all the elements necessary for the closure are already present on the bag, without any problems being caused with regard to storage and, should the need arise, mechanical filiing of the bag.

The present invention provides a bag having two opposite flat faces, wherein on one outer face, at or near the edge of the bag opening, there is a first area of contact adhesive and, on the other outer face, there is a second, corresponding area of contact adhesive arranged generally parallel to the first area but displaced from the furthest boundary thereof by two area widths.

Advantageously, each adhesive area is in the form of a strip. Preferably, the first adhesive area is located substantially immediately adjacent to the bag opening. The displacement of the second adhesive area, by two area widths, is then taken from the edge of the bag opening.

For improved security of the closure, each of the two adhesive areas may extend over substantially the whole width of the corresponding bag face.

Conveniently, there are pre-stamped, transversely extending folding lines at the area boundaries that are nearest to one another.

The invention relates especially to bags made of paper (or at least having flat facing walls made of paper), but other materials may be used.

The term "contact adhesive" shall be understood to mean an adhesive which enters into an adhesive bond only with an associated second adhesive layer and not with any other materials.

Such contact adhesives can be provided both for long-term closures (for sending articles by post) and for closures which are to be opened again several times (printed matter, trade samples).

Contact adhesives of this type have already been used in customary envelopes. In those cases, however, in order that an envelope is not sealed by mistake or that several envelopes do not stick together, it is necessary to provide special folding arrangements which render mechanical processing more difficult. This restriction does not apply to the bag according to the invention. When the bag has not yet been folded (the folding always taking place only immediately before sealing), the bags lie flat in the normal manner and, because of the staggering of the positions of the two adhesive areas, resulting from the specified displacement, the bags can be stacked, lying in the same direction, in store rooms and the like without sticking to one another.

The attached drawing shows a perspective view of a paper bag for sending exposed films which is provided with a closure according to the invention.

Referring to the accompanying drawing, the bag itself has the conventional shape with two outer faces 1 and 2 and retracted lateral folds 3.

At one end a so-called cross-over base closure 4 is provided which is firmly stuck together.

According to the invention, the other, open end of the bag has two folding lines 5 and 6 which extend parallel to the edges 7, 8 of the opening. In this manner end regions A and B of the bag are determined which are of equal width and are folded over for the purpose of closure; in the drawing the first end region A is already partly folded along fold 5. The outer face 1 of this first end region is coated with one component of an adhesive, indicated by the dotted surface; this component will adhere only to a surface that, in its turn, is coated with the other component of the adhesive and is arranged in region C on the other outer face of the bag in such a manner that, after folding over the neck of the bag twice, the two components (end region A and region C) lie congruently. The three regions A, B and C are therefore of substantially equal width.

When the bags are opened they can accordingly be stacked and separated in a troublefree manner and without risk of them sticking together. The bag is particularly suitable for mechanical sealing.

1. A bag having two opposite flat faces, wherein on one outer face, at or near the edge of the bag opening, there is a first area of a contact adhesive and, on the other outer face, there is a second, corresponding area of a contact adhesive arranged generally parallel to the first area but displaced from the furthest boundary thereof by two area widths.

2. A bag as claimed in claim 1, wherein each adhesive area is in the form of a strip.

3. A bag as claimed in claim 1 or claim 2, wherein the first adhesive area is located substantially immediately adjacent to the bag opening.

4. A bag as claimed in any one of claims 1 to 3, wherein each of the two adhesive areas extends over substantially the whole width of the corresponding bag face.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Paper bags The invention relates to a flat bag of paper or other suitable material which can be sealed after folding over the edge portions defining its opening. Bags of this type are used for the mass despatch of similarly shaped articles, for example of trade samples, films and the like. Customary bags of this type are sealed by folding over the neck of the bag once or, even better, twice, making a hole in the ridge thus formed (it is also possible for the hole to be made when the bag is manufactured), and then securing the closure by inserting a metal fastener. This type of closure is disadvantageous, however, because it is necessary to store separately a supply of fasteners; the fasteners may fall out again and, furthermore, there is a certain risk of injury being caused by their sharp edges. It is, of course, possible to use an adhesive tape instead of the fasteners, but manipulating this involves much more trouble than using metal clips. It is an object of the invention to provide a bag of the type mentioned at the beginning in which all the elements necessary for the closure are already present on the bag, without any problems being caused with regard to storage and, should the need arise, mechanical filiing of the bag. The present invention provides a bag having two opposite flat faces, wherein on one outer face, at or near the edge of the bag opening, there is a first area of contact adhesive and, on the other outer face, there is a second, corresponding area of contact adhesive arranged generally parallel to the first area but displaced from the furthest boundary thereof by two area widths. Advantageously, each adhesive area is in the form of a strip. Preferably, the first adhesive area is located substantially immediately adjacent to the bag opening. The displacement of the second adhesive area, by two area widths, is then taken from the edge of the bag opening. For improved security of the closure, each of the two adhesive areas may extend over substantially the whole width of the corresponding bag face. Conveniently, there are pre-stamped, transversely extending folding lines at the area boundaries that are nearest to one another. The invention relates especially to bags made of paper (or at least having flat facing walls made of paper), but other materials may be used. The term "contact adhesive" shall be understood to mean an adhesive which enters into an adhesive bond only with an associated second adhesive layer and not with any other materials. Such contact adhesives can be provided both for long-term closures (for sending articles by post) and for closures which are to be opened again several times (printed matter, trade samples). Contact adhesives of this type have already been used in customary envelopes. In those cases, however, in order that an envelope is not sealed by mistake or that several envelopes do not stick together, it is necessary to provide special folding arrangements which render mechanical processing more difficult. This restriction does not apply to the bag according to the invention. When the bag has not yet been folded (the folding always taking place only immediately before sealing), the bags lie flat in the normal manner and, because of the staggering of the positions of the two adhesive areas, resulting from the specified displacement, the bags can be stacked, lying in the same direction, in store rooms and the like without sticking to one another. The attached drawing shows a perspective view of a paper bag for sending exposed films which is provided with a closure according to the invention. Referring to the accompanying drawing, the bag itself has the conventional shape with two outer faces 1 and 2 and retracted lateral folds 3. At one end a so-called cross-over base closure 4 is provided which is firmly stuck together. According to the invention, the other, open end of the bag has two folding lines 5 and 6 which extend parallel to the edges 7, 8 of the opening. In this manner end regions A and B of the bag are determined which are of equal width and are folded over for the purpose of closure; in the drawing the first end region A is already partly folded along fold 5. The outer face 1 of this first end region is coated with one component of an adhesive, indicated by the dotted surface; this component will adhere only to a surface that, in its turn, is coated with the other component of the adhesive and is arranged in region C on the other outer face of the bag in such a manner that, after folding over the neck of the bag twice, the two components (end region A and region C) lie congruently. The three regions A, B and C are therefore of substantially equal width. When the bags are opened they can accordingly be stacked and separated in a troublefree manner and without risk of them sticking together. The bag is particularly suitable for mechanical sealing. CLAIMS

5. A bag as claimed in any one of claims 1 to 4, which has pre-stamped, transversely extending folding lines at the area boundaries that are nearest to one another.

6. Flat bag which can be sealed after folding over the edges defining its opening, wherein on one outer face, directly parallel to the edge of the opening, the bag has a first strip of a contact adhesive and that a second contact adhesive strip is provided on the outer face parallel to the first strip but displaced from the edge of the opening by two strip widths.

7. A bag as claimed in any one ot claims 1 to wherein the bag is made of paper.

8. A bag substantially as hereinbefore described with reference to, and as shown n, rjis accompanying drawings.