WINDOW CONTAINER PACKAGING MATERIAL

• US 3,591,069 A
• Filed: 10/29/1969
• Issued: 07/06/1971
• Est. Priority Date: 10/29/1969
• Status: Expired due to Term

• Current Assignee: Donald W. Davis, William C. Heller Jr
• Original Assignee: Donald W. Davis, William C. Heller Jr
• Inventors: Heller, William C. Jr., Davis, Donald W.
• Application Number:
  US04/872,080
• Time in Patent Office: 615 Days
• US Class Current: 229/162.3
• CPC Class Codes: B31B 50/82 Forming or attaching windows
• CPC Class Codes: B65D 5/4204 Inspection openings or windows
• CPC Class Codes: Y10T 428/24322 Composite web or sheet

Abstract

A packaging material for containers having coated window openings therein for viewing the contents. The window openings are formed in a container base sheet and covered by a transparent window sheet secured to the base sheet. The window sheet and base sheet are covered with a layer of transparent film to provide a window container packaging material having improved resistance to rupture and leakage.

Claims

1. A packaging material for containers having windows therein comprising, a single base sheet having a window opening defined in a predetermined area thereof, a transparent window sheet having a membrane portion covering the window opening and having marginal portions secured to one side of the base sheet adjacent the window opening, and a layer of transparent film covering and bonded to at least the membrane portion of the window sheet and the adjacent portions of the base sheet surrounding the window opening.

2. The packaging material according to claim 1, wherein both sides of the window sheet and the surrounding portions of the base sheet are covered with layers of film bonded thereto.

3. The packaging material according to claim 1, wherein the window openings are defined in the base sheet by incisions which leave the cut portions of the window openings at least partially attached to the base sheet to provide removable covers for the openings.

4. The packaging material according to claim 2, wherein the window openings are defined in both the base sheet and in one of the covering layers by incisions which leave the cut portions of the window openings at least partially attached to the base sheet to provide removable covers for the openings.

5. The packaging material according to claim 1, wherein the transparent window sheet is secured about its entire marginal area to one side of the base sheet and the layer of film covers and is bonded to the entire window sheet and the entire base sheet beyond the marginal edge of the window sheet.

6. The packaging material according to claim l, wherein the base sheet is cut into individual units, each scored to define predetermined fold lines.

7. The packaging material according to claim 6, wherein said base sheet is folded upon the predetermined fold lines formed therein to form a container with the transparent window sheet and its covering film layer is disposed interiorly of the container.

8. The packaging material according to claim 1 wherein the layer of transparent film is formed of a transparent sealing substance bonded to the other side of the base sheet and through the window opening therein to the membrane portion of the window sheet for sealing the window opening against leakage.

9. The packaging material according to claim 1 wherein the layer of film is also bonded to one side of the base sheet and to one entire side of the window sheet to assist in securing the window sheet to the base sheet.

10. The packaging material according to claim 1 wherein the window sheet is formed of a rupture resistant supportive material and said layer of transparent film is formed of a transparent sealing substance supported by the window sheet for sealing the window opening against leakage.

11. The packaging material according to claim 10 suitable for forming a leak proof container for storing contents wherein the window sheet is formed of a supportive material pervious to the contents, and the layer of transparent film is formed of a substance impervious to the contents supported by the window sheet.

12. The packaging material according to claim 10 wherein the window sheet is formed of cellophane and the layer of transparent film is formed of polyethylene.

13. A packaging material for containers having windows therein comprising, a single base sheet having a window opening defined in a predetermined area thereof, a transparent window sheet having a membrane portion covering the window opening and having marginal portions secured to one side of the base sheet adjacent the window opening, and a layer of transparent film covering at least the membrane portion of the window sheet and bonded to the adjacent portions of the base sheet surrounding the window opening for securement over said membrane portion.

14. The packaging material according to claim 13 wherein both sides of the window sheet are covered with a layer of transparent film bonded to the adjacent portions of the base sheet surrounding the window opening.

15. The packaging material according to claim 13 wherein the layer of transparent film is bonded to the adjacent portions of the base sheet on the other side thereof from that on which the transparent window sheet is secured.

16. The packaging material according to claim 13 wherein the layer of film is bonded to the one side of the base sheet around the marginal portions of the transparent window sheet.