Method of Manufacture of a Container
This invention relates to a method of making a container having a separable inner lining and outer shell, and in particular to methods of lining a container with a pre-formed lining. This invention also relates to apparatus for use in such methods. A method of lining a container with a pre-formed flexible plastics lining, the container having an opening and a rim extending around the opening and at least a part of the lining substantially conforming to an internal shape of the container, comprises inserting the lining into the container so that a first part of the lining is in contact with internal surfaces of the container and a second part of the lining protrudes from the opening of the container; adhering the first part of the lining to the internal surfaces of the container; adhering a tab to an external surface of the container so that a first part of the tab is adhered to the surface and a second part of the tab is not adhered to the surface, the adherence between the first part of the tab and the container being such that the tab can subsequently be peeled and separated from the external surface; and conforming the second part of the lining to the external surface of the container such that the second part of the lining at least partially covers the first part of the tab.
1 . A method of lining a container with a pre-formed flexible plastics lining, the container having an opening and a rim extending around the opening and at least a part of the lining substantially conforming to an internal shape of the container, the method comprising:
inserting the lining into the container so that a first part of the lining is in contact with internal surfaces of the container and a second part of the lining protrudes from the opening of the container;
adhering the first part of the lining to the internal surfaces of the container;
adhering a tab to an external surface of the container so that a first part of the tab is adhered to the surface and a second part of the tab is not adhered to the surface, the adherence between the first part of the tab and the container being such that the tab can subsequently be peeled and separated from the external surface; and
conforming the second part of the lining to the external surface of the container such that the second part of the lining at least partially covers the first part of the tab.
2 . The method of claim 1 , wherein the container is made from paperboard.
3 . The method of claim 1 , the method further comprising forming a region of weakness in the second part of the lining.
4 . The method of claim 3 , wherein the region of weakness comprises a line of perforations.
5 . The method of claim 4 , wherein the line of perforations extends from an edge of the second part of the lining towards the rim of the container.
6 . -The method of claim 4 , wherein the line of perforations extends circumferentially around a part of the circumference of the container.
7 . The method of claim 4 , wherein a first line of perforations extends circumferentially around the container and a second line of perforations extends between the edge of the second part of the lining and the first line of perforations.
8 . The method of claim 1 , wherein the internal surfaces of the container are pre-coated with a heat activated adhesive before the lining is inserted, and the step of adhering the first part of the lining to the internal surfaces of the container comprises heating said adhesive to a temperature at which the adhesive becomes tacky.
9 . The method of claim 1 , wherein, prior to adhering the tab to the container, the method further comprises the steps of:
detecting an orientation of the container; and
rotating the container through a pre-determined angle about an axis normal to a base of the container.
10 . The method of claim 1 , wherein the step of conforming the second part of the lining to the external surface of the container comprises heat shrinking said second part of the lining.
11 . An apparatus for lining a container with a pre-formed flexible plastics lining, the container having an opening and a rim extending around the opening and at least a part of the lining substantially conforming to an internal shape of the container, the apparatus comprising:
means for inserting the lining into the container so that a first part of the lining is in contact with internal surfaces of the container and a second part of the lining protrudes from the opening of the container;
means for adhering the first part of the lining to the internal surfaces of the container;
means for adhering a tab to an external surface of the container so that a first part of the tab is adhered to the surface and a second part is not adhered to the surface, the adherence between the first part of the tab and the container being such that the tab can subsequently be peeled and separated from the external surface; and
means for conforming the second part of the lining to the external surface of the container such that the second part of the lining at least partially covers the first part of the tab.
12 . The apparatus of claim 11 , the apparatus further comprising means for forming a region of weakness in the second part of the lining.
13 . The apparatus of claim 12 , wherein the means for forming a region of weakness comprises perforating means for perforating the lining.
14 . The apparatus of claim 13 , wherein the perforating means is arranged to form a line of perforations extending circumferentially around the container.
15 . The apparatus of claim 14 , wherein the perforating means comprises a concave, castellated cutting edge.
16 . The apparatus of claim 11 , wherein the apparatus further comprises:
means for detecting an orientation of the container; and
means for rotating the container through a pre-determined angle about an axis normal to a base of the container.
17 . The apparatus of claim 11 , wherein the means for conforming the second part of the lining to the external surface of the container comprises heating means to heat shrink said second part of the lining.