GB2108080A

GB2108080A - Storing and dispensing grinding discs

Info

Publication number: GB2108080A
Application number: GB08226151A
Authority: GB
Inventors: Kurt Betlehem
Original assignee: Keppo Oy AB
Current assignee: KWH Group Ltd
Priority date: 1981-09-16
Filing date: 1982-09-14
Publication date: 1983-05-11
Also published as: SE8205293L; SE8205293D0; FI63880C; FI63880B; GB2108080B

Abstract

Individual cut-out, self-adhesive grinding discs (1) are attached to an oblong carrying spine (2) and wound into a roll (3), the abrasive-coated face of the grinding discs (1) being directed outwards. The roll (3) is placed in a box (4), one of whose side walls is provided with a crescent shaped opening (5) corresponding to the width of the discs for dispensing the individual grinding discs (1). The grinding-discs are attached to the carrying spine so that they overlap each other and the contact face between the carrying spine and each of the grinding discs (1) comprises only a little edge portion (1a). When unwound from the roll (3), the individual grinding discs (1) have their portions (1a) attached to the carrying spine at their front edges, whereby the free rear edge (1b) of each grinding disc (1) forms a grasping face for dispensing of the grinding discs (1) from the continuous unit. The discs may be circular, rectangular or square and the carrying spine may be of silicone paper. More than one carrying spine may be provided. <IMAGE>

Description

SPECIFICATION Grinding-disc product and method for the manufacture of same The subject of the present invention is, in the first place, a flexibly bending grinding-disc product, which comprises completely cut-out, self-adhesive grinding discs, such as rounds or sheets, which are attached to a preferably adhesive-free, centrally located oblong carrying spine so that a continuous unit is formed. The continuous unit is appropriately wound to a roll, the abrasive-coated face of the grinding discs being thereby directed outwards. The roll is appropriately placed in a package, one of whose side walls is provided with an openable opening corresponding to the length of the roll.

The invention is also concerned with a method for the manufacture of the grinding-disc product mentioned above, according to which method self-adhesive, completely cut-out grinding discs, such as rounds or sheets, are attached to a preferably adhesive-free, centrally located oblong carrying spine to make a continuous unit, which is wound to a roll with the abrasive-coated face of the grinding discs being directed outwards. The roll can be appropriately placed in a package, in one of whose side walls an opening corresponding to the length of the roll can be opened for dispensing of the individual grinding discs.

Prior-art grinding-disc products comprise a line of self-adhesive grinding discs which are connected with each other along perforated lines substantially tangentially to the discs. The adhesive-coated face of the connected grinding discs is totally covered by a continuous plastic film of corresponding shape. This configuration makes it difficult to detach the plastic film from a grinding disc when the disc is to be used, and, moreover, it is necessary to cut the grinding discs out of large sheets, as they are interconnected, which tends to result in high losses of abrasive disc material in the manufacture.

In order to eliminate the problem of removing the protective plastic film from the adhesivecoated face of the grinding discs, e.g., according to the U.S. Patent No. 3,849,949, the grinding discs have been provided with a pressuresensitive adhesive, whereby the line of grinding discs is wound to a roll, in which the adhesivecoated face is in detachable contact with the abrasive coating of the adjoining layer in the roll so that the roll form is maintained. The roll is preferably placed in a particular dispenser provided with a tear edge for tearing-off of the individual grinding discs.

In spite of the fact that the problem of the protective coating has been eliminated in this way, the drawback, nevertheless, remains that the manufacturing requires an availability of large sheets of abrasive discs, for which reason a high proportion of the abrasive disc material is lost as waste.

In order to eliminate this problem, it has been suggested that the individual grinding discs be cut out completely, whereupon they are one by one attached one after the other to a carrying spine of paper or equivalent. In order to facilitate the removal of a grinding disc from the continuous unit, the carrying spine has appropriately been given a width that is approximately equal to half the width of the grinding disc. The carrying spine, which is attached to the grinding disc along its entire length, makes the winding of the continuous unit to a roll more difficult, especially when the size of the grinding discs is larger, for which reason grinding discs connected in this way are appropriately packed in a box so that the continuous unit is folded within the zone between each grinding disc.Grinding discs packed in this way are rather difficult to remove from the package, because at every second intermediate space arising between the grinding discs on folding, the grinding discs will have their adhesive-coated faces in contact with each other.

Moreover, relatively long strips of paper or of any other material are required for the carrying spine, in relation to the number of grinding discs.

The object of the present invention is to eliminate the above drawbacks, which has been achieved by means of a flexibly bending grindingdisc product which is characterized in that the grinding discs are attached to the carrying spine, consisting of one or several narrow strips, so that the grinding discs overlap each other and the contact free face between the carrying spine and each of the grinding discs included in the unit comprises only a little edge portion of each grinding disc. The continuous unit is wound to a roll in such a direction that, when unwound from the roll, the individual grinding discs have their portions attached to the carrying spine at their front edges, whereby the free rear edge of each grinding disc forms a grasping face for dispensing of the grinding discs from the continuous unit.

Further characteristics of the invention come out from the attached patent claims.

The invention will be described in more detail with reference to the attached drawing, wherein Figure 1 shows an embodiment of the grinding-disc product in accordance with the invention as placed in a package, Figure 2 shows the grinding-disc product of Fig. 1 as viewed from the left, Figures 3 and 4 show a portion of the continuous unit of grinding discs in accordance with the invention as viewed from the side, and Figures 5 and 6 show the portions shown in Figures 3 and 4, respectively, as viewed from above.

The grinding-disc product in accordance with the invention comprises completely cut-out, selfadhesive grinding discs 1, such as rounds or sheets, which are attached to one oblong carrying spine 2 to make a continuous unit, which unit is wound to a roll 3 with the abrasive-coated face of the grinding discs facing outwards. The roll 3 is appropriately placed in a package 4, in one of whose side walls an opening 5 corresponding to the length of the roll 3 is opened or openable for dispensing of the individual grinding discs 1.

The grinding discs 1 are attached by means of self-adhesion to the carrying spine 2 consisting of one of several strips so that the grinding discs 1 overlap each other in the way coming out from Figures 5 and 6. The contact face between the carrying spine 2 and each of the grinding discs 1 included in the unit, thus, only comprises a little edge portion of each grinding disc 1, which results in the circumstance that the continuous unit can be easily wound to a roll, because a relative shifting between a great proportion of each grinding disc and the carrying spine can take place. The length of the carrying spine required in this case is only a fraction of the length that is required for the same number of grinding discs packed in accordance with the prior-art methods.

The continuous unit is wound to a roll 3 in such a direction that, when unwound from the roll, the individual grinding discs 1 have their portions 1 a attached to the carrying spine at their front edges, whereby the free rear edge I b of each grinding disc 1 forms a grasping face for dispensing of the grinding discs 1 from the continuous unit. Since each grinding disc 1 is attached to the carrying spine 2 only at a small edge portion 1 a of its side face, it is very easy to detach one or several grinding discs 2 from the carrying spine 2 as required.

The shape of the grinding discs 1 may be circular, like in Fig. 6, rectangular, like in Fig. 5, or of any other, arbitrary form. In the former case, the carrying spine 2 consists appropriately of a strip of paper, such as silicone paper, or of another material, and in the latter case appropriately of one of several strips of corresponding material, which is preferable in the case of larger sizes of grinding discs 2.

When the grinding discus 1 are rectangular or square, they may be attached to the carrying spine so that the carrying spine is either parallel to one of the centre lines of the rectangle or parallel to one of its diagonals.

The degree of overlapping of the grinding discs 1 in the continuous unit may be different depending on the properties of the grinding discs, such as rigidity, shape, coarseness of the abrasive material, and equivalent, as well as depending on the requirements imposed on the ready-packed product.

The continuous unit wound to a roll 3 may be appropriately placed in a box-shaped package 4, one of whose side walls, which is tangent to the roll 3, is provided with an appropriately cresentshaped opening 5 with the arched side of the opening facing towards the nearest edge that is parallel to the axis of the roll 3. With this form of the opening 5, it is easier to grasp the rear edge 1 b of the grinding disc 1 that is to be removed from the package 4.

It is obvious that the self-adhesive grinding discs in accordance with the present invention may show variation both in respect of their form and in respect of their size.

Claims

1. A flexibly bending grinding-disc product, which comprises completely cut-out, selfadhesive grinding discs (1), such as rounds or sheets, which are attached to an adhesive-free, centrally located oblong carrying spine (2) so that a continuous unit is formed, which unit is wound to a roll (3), the abrasive-coated face of the grinding discs (1) being directed outwards, and the roll (3) being appropriately placed in a package (4), one of whose side walls is provided with an openable opening (5) corresponding to the length of the roll (3) for dispensing of the individual grinding discs (1), characterized in that the grinding discs (1) are attached to the carrying spine (2), consisting of one or several narrow strips, so that the grinding discs (1) overlap each other and the contact face between the carrying spine (2) and each of the grinding discs (1) included in the unit comprises only a little edge portion (lea) of each grinding disc (1), and that the continuous unit is wound to a roll (3) in such a direction that, when unwound from the roll (3), the individual grinding discs (1) have their portions attached to the carrying spine at their front edges, whereby the free rear edge (1 b) of each grinding disc (1) forms a grasping face for dispensing of the grinding discs (1) from the continuous unit.

2. A grinding-disc product as claimed in claim 1, characterized in that the shape of the grinding discs (1) is circular and the discs are attached to a carrying spine (1) of paper, such as silicone paper or another material.

3. A grinding-disc product as claimed in claim 1, characterized in that the shape of the grinding discs (1) is rectangular and the discs are attached to a carrying spine (2) of paper, such as silicone paper or another material, whereby the carrying spine (2), consisting of one or several strips, is either parallel to one of the centre lines of the rectangle or parallel to one of its diagonals.

4. A grinding-disc product as claimed in any of claims 1 to 3, characterized in that the degree of overlapping of the grinding discs (1) in the continuous unit is variable depending on the properties of the grinding discs, such as rigidity, shape, coarseness of the adhesive material, and equivalent.

5. A grinding-disc product as claimed in any of the preceding claims, characterized in that the roll (3) is placed in a box-shaped package (4), one of whose side walls, which is tangent to the roll (3), is provided with an appropriately crescent-shaped opening (5), the arched side of the opening facing towards the nearest edge that is parallel to the axis of the roll.

6. A grinding-disc product as claimed in claim 1, characterized in that the grinding discs (1) have a shape of free choice.

7. A method for the manufacture of the grinding-disc product as claimed in claim 1, according to which method self-adhesive, completely cut-out grinding discs are attached to an adhesive-free, centrally located oblong carrying spine to make a continuous unit, which unit is wound to a roll with the abrasive-coated face of the grinding discs being directed outwards, which roll can be appropriately placed in a package, in one of whose side walls an opening corresponding to the length of the roll can be opened for dispensing of the individual grinding discs, characterized in that the grinding discs are attached to the carrying spine, consisting of one or several narrow strips, so that the grinding discs overlap each other and the contact face between the carrying spine and each of the grinding discs included in the unit comprises only a little edge portion of each grinding disc, and that the continuous unit is wound to a roll in such a direction that, when unwound from the roll, the individual grinding discs have their portions attached to the carrying spine at their front edges.

8. A method as claimed in claim 7, characterized in that the grinding discs are attached to the carrying spine with an overlapping degree that is adapted to the properties of the grinding discs, such as rigidity, shape, size, coarseness of the abrasive material, and equivalent.