GB1564307A

GB1564307A - Packaging materials

Info

Publication number: GB1564307A
Application number: GB3637376A
Authority: GB
Original assignee: Pakcel Converters Ltd
Current assignee: Pakcel Converters Ltd
Priority date: 1977-08-10
Filing date: 1977-08-10
Publication date: 1980-04-10

Description

(54) IMPROVEMENTS IN OR RELATING TO PACKAGING MATERIALS (71) We, PAKCEL CONVERTERS LIMI TED a British Company of Lancots Lane, St. Helens, Lancashire, WA9 3ET, do hereby declare the invention for which we pray that a Patent may be granted to us and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to a packaging material consisting of a transparent flexible film printed to provide two visible opaque designs.

We have now found that the difficulty of obtaining sufficient opacity of the two designs to prevent or minimise "show-through" of one design when viewing the other design can be overcome.

According to the present invention there is provided a packaging material consisting of a transparent flexible film which has been printed to give two opaque designs with backgrounds in such a manner that a first design is viewable only from one side of the film and a second design is viewable only from the other side of the film and that the design backgrounds have sufficient opacity so as to permit visual appreciation of one design without interference from the other design, the film having been printed in the following sequence of layers: (a) the first design is printed in reverse on the film; (b) a first background printed directly on layer (a); (c) a second background, having a different degree of colouration to that of layer (b), printed directly on layer (b); (d) the second design printed on layer (c).

The transparent flexible film may be a single ply film. If desired a third design may be printed on layer (d), the third design being such as to complement or modify the second design. A further layer of transparent flexible film may be applied to layer (d) or any layer subsequently applied to layer (d).

Preferably two different designs are applied so as to give different visual information when viewed from opposite sides.

In ordinary daylight and conventional lighting conditions there will be no "showthrough" as mentioned above but such "show-through" may be evident with intense illumination or in the direct path of a beam of light, but such strong lighting is not representative of practical conditions.

The printing may be effected by conventional printing ink systems including flexographic or rotagravure.

The packaging material of the invention is preferably obtained by utilising a predetermined combination of specific colour shades printed in a predetermined printing sequence.

The two designs may be the same but for the purposes of the invention are generally different whereby two different designs can be applied to a packaging film so as to give different visual information when viewed both from the outside and the inside (when the packaged article is unwrapped) of the package.

One of the designs may, for instance, be in red on a gold background or, for instance, in maroon on a blue background.

Such colour arrangements may, of course, be provided for one and the same film. The design may be represented to give information by virtue of appropraite wording and/or pictorial design.

EXAMPLE A web of transparent flexible packaging film of synthetic polymeric material was printed on one face only with the following sequence: (a) a design in red comprising several words printed in reverse on the film; (b) a gold background for the red design directly on layer (a); (c) a pale blue background for the second design directly on layer (b); (d) a design of maroon letters on layers (c).

Layers (a) and (b) constitute in reverse one design and layers (c) and (d) constitute the other design.

In a modification of this procedure further wording in white was printed as layer (e) directly on layer (d), layer (e) constituting part of the second design.

After layers (a) to (d) or (a) to (e) have been pritned, e.g. by rotagravure, layer (d) or layer (e), whichever is the last printed layer, a further layer of transparent flexible film is applied to layer (d) or layer (e) to provide a lamiante (Multiply).

In our investigations of colour arrangements we find that especially good results are obtainable when gold, bronze or silver is used in the centre of printed areas. Other colours can be used such as green, red, blue, brown but we recommend that gold should be used as the basic main background for one of the designs. It will be understood that a certain amount of experimentation may be inevitable, depending on the nature of the designs intended, to determine optimum results for any particular combination of colours and their printing sequence but any such experiments should be relatively simple since conventional printing procedures are applicable and one may proceed on an uncomplicated trial and error basis to ascertain the required degree of opacity.

WHAT WE CLAIM IS: 1. A packaging material consisting of a transparent flexible film which has been printed to give two opaque designs with backgrounds in such a manner that a first design is viewable only from one side of the film and a second design is viewable only from the other side of the film and that the design backgrounds have sufficient opacity so as to permit visual appreciation of one design without interference from the other design, the film having been printed in the following sequence of layers: (a) the first design is printed in reverse on the film; (b) a first background printed directly on layer (a); (c) a second background, having a different degree of colouration to that of layer (b), printed directly on layer (b); (d) the second design printed on layer (c).

2. A packaging material according to Claim 1, wherein the transparent flexible film is a single ply film.

3. A packaging material according to Claim 1 or Claim 2, wherein a third design is printed on layer (d), the third design being such as to complement or modify the second design.

4. A packaging material according to any preceding claim, wherein a further layer of transparent flexible film is applied to layer (d) or to any layer subsequently applied to layer (d).

5. A packaging material according to any preceding claim, in which printing has been effected by a flexographic or rotogravure procedure.

6. A packaging material according to any preceding claim, which has been prepared by utilising a predetermined combination of specific colour shades printed in a predetermined printing sequence.

7. A packaging material according to any preceding claim, wherein two different designs have been applied so as to give different visual information when viewed from opposite sides.

8. A packaging material according to any preceding claim, wherein one of the designs is in red on a gold background.

9. A packaging material according to any preceding claim, wherein one of the designs is in maroon on a blue background.

10. A packaging material substantially as herein described and exemplified.

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. (c) a pale blue background for the second design directly on layer (b); (d) a design of maroon letters on layers (c). Layers (a) and (b) constitute in reverse one design and layers (c) and (d) constitute the other design. In a modification of this procedure further wording in white was printed as layer (e) directly on layer (d), layer (e) constituting part of the second design. After layers (a) to (d) or (a) to (e) have been pritned, e.g. by rotagravure, layer (d) or layer (e), whichever is the last printed layer, a further layer of transparent flexible film is applied to layer (d) or layer (e) to provide a lamiante (Multiply). In our investigations of colour arrangements we find that especially good results are obtainable when gold, bronze or silver is used in the centre of printed areas. Other colours can be used such as green, red, blue, brown but we recommend that gold should be used as the basic main background for one of the designs. It will be understood that a certain amount of experimentation may be inevitable, depending on the nature of the designs intended, to determine optimum results for any particular combination of colours and their printing sequence but any such experiments should be relatively simple since conventional printing procedures are applicable and one may proceed on an uncomplicated trial and error basis to ascertain the required degree of opacity. WHAT WE CLAIM IS:

1. A packaging material consisting of a transparent flexible film which has been printed to give two opaque designs with backgrounds in such a manner that a first design is viewable only from one side of the film and a second design is viewable only from the other side of the film and that the design backgrounds have sufficient opacity so as to permit visual appreciation of one design without interference from the other design, the film having been printed in the following sequence of layers: (a) the first design is printed in reverse on the film; (b) a first background printed directly on layer (a); (c) a second background, having a different degree of colouration to that of layer (b), printed directly on layer (b); (d) the second design printed on layer (c).

10. A packaging material substantially as herein described and exemplified.