Packing protectors like those purported by the invention are used to protect the corners and edges of various sheet-like structures against damage e. g. during transportation. A packing protector of this type is presented in German application publica- tion 19606546. This packing protector is made of paper material folded so as to form an accordion or bellows type structure which can be used to protect various objects. However, this structure is in many respects unsatisfactory. It does not provide sufficient protec- tion for the desired object and, especially when used as a corner protector, it leaves the extremity of the corner of the object very poorly protected. In addi- tion, the protector is difficult to mount and espe- cially its capability to stay in position is poor.

A solution designed to eliminate the above- mentioned drawbacks is e. g. an elastic corner protec- tor made of plastic as presented in Finnish utility design application 950381. This corner protector has an elasticity property, so it can be used to protect products having different thickness dimensions and it also effectively protects the tip of the corner. The main problem with this product is the raw material used. As corner protectors are bulk goods, they are needed in large quantities, and consequently a lot of waste is produced.

The object of the present invention is to eliminate the drawbacks described above. A specific object of the present invention is to disclose a new type of packing protector which can be manufactured e. g. from recycled cardboard and provides effective protection for products in spite of this readily de- structible or recyclable material, is easy and simple

to use and also permits large variations in the thick- ness of the product to be protected.

As for the features characteristic of the in- vention, reference is made to the claims.

The packing protector of the invention pref- erably consists of an edge protector formed by narrow strips and of flanges extending in the same direction from the edge protector and designed to be placed on opposite surfaces of the object to be protected, both the edge protector and the flanges being manufactured e. g. from recycled cardboard. According to the inven- tion, the edge protector comprised in the packing pro- tector is provided with joining areas suitably con- necting adjacent cardboard strips of the edge protec- tor together so that the flanges of the packing pro- tector do not remain exactly parallel to each other but are obliquely converging, in other words, the dis- tance between the flanges at their free edges is shorter than the width of the edge protector, or the flange edges may even touch each other. Therefore, ac- cording to the invention, the packing protector can be placed on the edge of the object to be protected as the flanges are pressed against the surfaces of the object and keep the packing protector in place without any glue, tape or other agents between the packing protector and the object to be protected.

The packing protector is preferably manufac- tured from a single continuous cardboard sheet by folding the middle portion of the sheet alternately in different directions to form narrow parallel strips of equal width which constitute an accordion or bellows type edge protector. The edge parts of the sheet are then bent to form extensions of the outermost strips, forming flanges extending side by side in the same di- rection.

In another embodiment of the invention, the edge protector is manufactured from cardboard strips

of equal width which are glued together at suitable distances, the gluing being effected in a staggered manner so that the glue spots are not in the same line between each layer across the whole width of the edge protector. In this way, an edge protector of elastic and bellows-like structure is produced. The broader flanges can then be glued to the two edges of the edge protector so that, due to the elasticity of the edge protector, the flanges will be pressed against the parallel surfaces of the object to be protected.

The joining areas used in the strips are preferably glue spots or larger areas provided with glue. The joining areas are preferably disposed on those surfaces of the bellows-like edge protector which in the finished packing protector face toward the flanges, in other words, on the strip surfaces facing toward the inside of the packing protector.

In a preferred embodiment of the invention, the strips forming the edge protector are not com- pletely glued to each other at their inner surfaces.

Instead, they have joining areas at suitable dis- tances, the joining areas in different strips being preferably disposed along the same line in the width- ways direction of the edge protector and at suitable distances from each other in the lengthways direction of the edge protector. _ In a preferred embodiment of the invention, the folds between the edge protector strips are pro- vided with incisions to increase the elasticity of the edge protector, i. e. of the bellows-like structure of the packing protector. The incisions may be placed e. g. along the same line with the joining areas. In a preferred embodiment, the incisions are disposed along the same line with the joining areas but only in the inner folds between strips, so that the incisions are not visible from the outside of the finished packing

protector, but the accordion-like back of the packing protector looks solid and whole.

A packing protector as described above can be used on straight edges of sheet-like structures. In an embodiment of the invention, the packing protector is provided with a crosscut which in the finished packing protector extends from the direction of the flanges toward the edge protector, cutting through most of the edge protector. Thus, only in the area of the outer folds between the strips and in the area of the folds between the outermost strips and the flanges, narrow necks are formed which constitute a joint along the crosscut, connecting the two parts of the packing pro- tector thus formed on either side of the crosscut and permitting these parts to be bent to an angle relative to each other. In another alternative, the crosscut is not started right from the edge of the flanges but in- stead a small bridge is left at the beginning of the crosscut to enable the packing protector to remain straight and rigid, and only when the packing protec- tor is to be used in an angular shape, the bridges are torn or broken e. g. by bending in the reverse direc- tion. Thus, the same packing protector with a crosscut allowing its use as a corner protector can just as well be used as a straight protector on straight edges of objects.

In a preferred embodiment of the invention, the crosscut is disposed alongside a line of joining areas connecting the strips together and corresponding incisions in the inner folds between the strips so that the joining areas and incisions lie on one side of the crosscut. In this case, the strips on the other side of the crosscut are connected by both the inner and outer folds and have no joining areas keeping them together. Thus, when the two parts of the packing pro- tector are bent to an angle, the strip portions on ei- ther side of the crosscut will intermesh and will not

prevent the parts from being bent to an angle. At the same time, a strong double protection is formed in the intermeshing area at the vertex of the angle, which effectively protects the tip of the corner of the ob- ject.

As compared with prior art, the packing pro- tector of the invention has significant advantages.

Although the packing protector can be manufactured e. g. from cheap recycled cardboard, which can be read- ily recycled or destroyed, the packing protector has an elastic structure, even in two senses. First, thanks to the elasticity of the flanges and their skew toward each other, the packing protector remains in position around the object to be protected, so it need not be held fast during packaging, thus allowing faster and easier packaging. Second, the back part of the packing protector, i. e. the bellows-like edge pro- tector, is flexible in width, thus allowing one and the same packing protector size to be used for a large number of objects of different thickness dimensions.

Moreover, it is not necessary to have separate protec- tors for straight edges and corners, but the same packing protector can be used to protect straight edges and bent to an angle to protect corners.

In the following, the invention will be de- scribed in detail with reference to the attached draw- ings, wherein Fig. 1 presents a packing protector according to the invention, and Fig. 2 presents a blank with a crosscut, from which the packing protector illustrated in Fig. 1 has been formed.

The packing protector presented in Fig. 1, which is designed for the protection of a corner of a sheet-like object, has been manufactured from a card- board blank as illustrated in Fig. 2. The blank is of a substantially rectangular shape and it has straight

planar flanges 2 and 3 of equal width and length at its edges. Between the flanges is the part which forms the edge protector 1 in the packing protector. It con- sists of thirteen parallel creasing lines placed at equal distances from each other, forming between the flanges 2 and 3 an accordion or bellows type structure comprising twelve narrow strips 5.

Every second strip is provided with glue spots 4 placed at the same level in different strips and at a distance from each other in the longitudinal direction of the strips. In the area of the glue spots, every second fold, i. e. the inner folds 6 are provided with incisions 8, in other words, the inner folds have been cut open in these areas.

In addition, the blank is provided with a crosscut 9 that nearly cuts the blank in two in its middle portion transversely to the longitudinal direc- tion of the strips 5. The crosscut 9 begins from the bottom of indentations or bevellings 14 made in the flanges 2 and 3, yet so that small bridges 16 are ini- tially left in the blank. The crosscut then continues in an intermittent fashion so that a break is left in the crosscut at each outer fold 7 between strips 5 and at the folds 10 between the outermost strips and the flanges, said breaks forming a joint 11.

The crosscut 9 is so disposed that there are joining areas and also incisions 8 in the strips 5 im- mediately on one side of the crosscut whereas immedi- ately on the other side of the crosscut 9 there are no joining areas and no corresponding incisions.

Moreover, on one side of the crosscut 9, the flanges 2 and 3 are provided with locking incisions 15 for interlocking the flanges when the packing protec- tor is bent to an angle.

When blank illustrated in Fig. 2 is turned and pressed together, i. e. when the joining areas 4 are pressed against the opposite strip 5 or flange 2,

a straight elastic packing protector is formed in which the flanges 2 and 3 are aslant toward each other as illustrated in Fig. 1. When the packing protector is to be bent to form a corner protector as illus- trated in Fig. 1, the sections 12 and 13 of the pack- ing protector are bent about the joint 11, first slightly in the reverse direction, thus breaking the bridges 16. After this, the two sections 12 and 13 are bent to an angle relative to each other. As a result, the strip 5 areas in different sections 12 and 13 around the crosscut 9 intermesh, forming a thick and firm corner protection. At the same time, the bevelled indentations 14 in section 12 are pressed into the locking incisions 15 in the flanges in section 13, thus causing the two sections 12 and 13 to interlock at straight angles without being glued. However, it is also possible to use glued connections here either in- stead of locking incisions or in addition to them.

In the foregoing, the invention has been de- scribed by way of example with reference to the at- tached drawings, but different embodiments of the in- vention are possible within the scope of the inventive idea defined in the claims.