Composite container with peelable membrane

Patent metadata

Field	Value
Publication number	US-9802746-B2
Application number	US-201715630231-A
Country	US
Kind code	B2
Filing date	Jun 22, 2017
Priority date	Jul 10, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A composite container is provided for holding products (e.g., stacked chips). The container includes a tubular body and a peelable membrane. The tubular body is made of at least one paperboard body ply having an inner surface and a metallized Oriented Polypropylene (mOPP) liner ply adhered to the inner surface of the paperboard body ply. A liner sealant is disposed on the inner surface of the mOPP liner ply, and the paperboard body ply and the mOPP liner ply are rolled outwardly to form a rim. The membrane, which has a membrane sealant on its inner surface, is sealed to the liner sealant in the area of the rim to close the container. When the membrane is peeled away, the membrane sealant and the liner sealant remain sealed to each other and cause separation within the mOPP liner ply, avoiding tearing and exposure of the paperboard in the rim.

First claim

What is claimed is:

1. A method of manufacturing a composite container for holding products comprising:
forming a tubular body defining a first end by:
providing at least one paperboard body ply having an inner surface; and
adhering a metallized Oriented Polypropylene (mOPP) liner ply to the inner surface of the paperboard body ply, wherein the mOPP liner ply defines an inner surface and an outer surface, and wherein the mOPP liner ply comprises a liner sealant disposed on the inner surface of the mOPP liner ply,
wherein the at least one paperboard body ply and the mOPP liner ply are rolled outwardly to form a rim at the first end of the tubular body, wherein the first end defines an opening providing access to an interior of the tubular body and the products held therein; and

attaching a peelable membrane to the first end of the tubular body to form the container, wherein a membrane sealant is disposed on an inner surface of the peelable membrane and is sealed to the liner sealant on the rim of the tubular body,
wherein, upon peeling of the peelable membrane from the tubular body to access the products via the opening, the membrane sealant and the liner sealant remain sealed to each other and cause separation between the inner and outer surfaces of the mOPP liner ply to allow the peelable membrane to be removed from the first end of the tubular body.

2. The method of claim 1 , wherein the mOPP liner ply comprises an outer mOPP film layer, a core mOPP film layer, and an inner mOPP film layer, and wherein separation within the mOPP liner ply occurs within the core mOPP film layer.

3. The method of claim 1 , wherein the mOPP liner ply comprises a paper layer, a low density polyethylene (LDPE) tie layer, one or more mOPP film layers, and the liner sealant, and wherein the paper layer is adhered to the paperboard body ply to fix the mOPP liner ply to the paperboard body ply.

4. The method of claim 1 , wherein the liner sealant comprises a metallocene linear low-density polyethylene and high density polyethylene (mLLDPE-HDPE) coextrusion.

5. The method of claim 1 further comprising forming the membrane using at least one paper ply defining an inner surface, disposing an adhesive tie layer on the inner surface of the at least one paper ply, and placing a metalized polyethylene terephthalate (PET) film between the at least one paper ply and the membrane sealant via the adhesive tie layer.

6. The method of claim 1 , wherein each of the membrane sealant and the liner sealant comprises a high barrier film.

7. The method of claim 1 , wherein the liner sealant comprises a high barrier film with a moisture vapor transmission rate of less than 0.01 g/100 in 2 /day and an oxygen transmission rate of less than 1.0 cc/100 in 2 /day.

8. The method of claim 1 , wherein the membrane sealant comprises a high barrier film with a moisture vapor transmission rate of less than 0.01 g/100 in 2 /day and an oxygen transmission rate of less than 0.02 cc/100 in 2 /day.

9. The method of claim 1 , wherein the membrane sealant is sealed to the liner sealant using punch-seal-overcapper equipment.

10. The method of claim 1 further comprising spirally winding the paperboard body ply and the mOPP liner ply to form the tubular body.

Assignees

• Sonoco Dev Inc

Inventors

• Rhue Elizabeth

Classifications

• B65D3/22

  with double walls; with walls incorporating air-chambers; with walls made of laminated material {(for thermal insulating purposes B65D81/3818)} · CPC title

• B65D2577/2033

  with one or more layers of container being torn off upon initial opening · CPC title

• B65D43/02

  Removable lids or covers (with means for piercing, cutting, or tearing a frangible inner closure B65D51/22) · CPC title

• B31B50/26

  Folding sheets, blanks or webs · CPC title

• B65D17/502

  applied to the external part of the container wall only · CPC title