Granted Patent
B2
US 11,725,086 · App. 16/291,445 · Granted Aug 15, 2023
Shrink films and methods for making the same
Inventors:
Krishnaraju Varadarajan (Evansville, IN); Daniel L. Merriman (Greenville, SC); Abboud L. Mamish (Marlborough, MA)
Assignee:
Berry Global, Inc.
C08J5/18B29C48/001B29C48/022B29C48/08B29C48/912C08L23/06B65D71/08C08L2203/16C08L2203/162C08L2205/025C08L2207/062C08L2207/066
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Abstract
A shrink film includes at least one layer of polyethylene. The layer has a thickness of about 1 mil to about 3 mil. Materials and methods for forming crosslinked shrink films via a blown film extrusion process are described.
Claims (18)
1. A process for making a shrink film, the process comprising the steps of extruding an extrudable material through a die to form a molten tubular film,
injecting the molten tubular film with air to form a film bubble,
drawing the film bubble away from the die, wherein the drawing step includes a step of crosslinking the film bubble, and
irradiating the film bubble to form a shrink film, wherein the shrink film is coextruded and has at least two layers with irradiation of the film bubble causing substantially uniform crosslinking in each of the at least two layers,
wherein the extrudable material comprises about 40 wt. % to about 70 wt. % LDPE, about 30 wt. % to about 40 wt. % HDPE, and about 10 wt. % to about 40 wt. % metallocene polyethylene (mPE).
2. The process of claim 1 , wherein the crosslinking step comprises an electron beam irradiation with a dose of about 1.25 Mrad to about 10 Mrad.
3. The process of claim 2 , wherein the electron beam irradiation is at a potential of about 100 KeV to about 250 KeV.
4. The process of claim 2 , wherein the film is about 1 mil to about 3 mils thick.
5. A process for making a shrink film, the process comprising the steps of extruding an extrudable material through a die to form a molten tubular film,
injecting the molten tubular film with air to form a film bubble, and
drawing the film bubble away from the die to form a shrink film,
wherein the drawing step includes a step of crosslinking the film bubble such that each layer of a plurality of co-extruded layers of the shrink film is substantially uniformly crosslinked to another layer of the plurality of co-extruded layers,
wherein the extrudable material comprises about 30 wt. % LDPE, about 39 wt. % HDPE, and about 28 wt. % metallocene polyethylene (mPE).
6. The process of claim 5 , wherein the crosslinking step comprises an electron beam irradiation with a dose of about 1.25 Mrad to about 10 Mrad.
7. The process of claim 6 , wherein the electron beam irradiation is at a potential of about 100 KeV to about 250 KeV.
8. The process of claim 5 , wherein the film is about 1 mil to about 3 mils thick.
9. The process of claim 1 , wherein the shrink film is recyclable.
10. The process of claim 1 , wherein the shrink film has a dart impact strength in a range of about 65 gf/mil to about 130 gf/mil.
Assignments (31)
RELEASE OF SECURITY INTEREST
Recorded Mar 3, 2026
From: U.S. BANK TRUST COMPANY
To: FABRENE INC.; BERRY PLASTICS FILMCO, INC.; LETICA CORPORATION; BERRY GLOBAL, INC.; BERRY GLOBAL FILMS, INC.; COVALENCE SPECIALTY COATINGS LLC; PGI POLYMER, INC.; FIBERWEB, LLC; BPREX HEALTHCARE PACKAGING INC.; PLIANT, LLC; CHICOPEE, INC.; AVINTIV SPECIALITY MATERIALS INC.; CAPTIVE PLASTICS, INC.; COVALENCE SPECIALTY ADHESIVES LLC; LADDAWN, INC.; AEP INDUSTRIES, INC.; BERRY FILM PRODUCTS COMPANY, INC.; ROLLPAK CORPORATION; KERR GROUP, LLC; PRIME LABEL & SCREEN, INC.; PRIME LABEL AND SCREEN INCORPORATED; PROVIDENCIA USA, INC.
Reel/Frame 075042/0813 →
RELEASE OF PATENT SECURITY INTERESTS
Recorded May 5, 2025
From: UBS AG, STAMFORD BRANCH (SUCCESSOR TO CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH), AS TERM LOAN COLLATERAL AGENT; BANK OF AMERICA, N.A., AS ABL COLLATERAL AGENT
To: AVINTIV SPECIALTY MATERIALS, LLC (F/K/A AVINTIV SPECIALTY MATERIALS INC.); BERRY FILM PRODUCTS COMPANY, INC.; BERRY GLOBAL FILMS, LLC; BERRY GLOBAL, INC.; BERRY PLASTICS CORPORATION; BERRY PLASTICS FILMCO, INC.; BERRY PLASTICS HOLDING CORPORATION; BPREX HEALTHCARE PACKAGING INC.; COVALENCE SPECIALTY ADHESIVES LLC; FIBERWEB, INC.; FIBERWEB, LLC; KERR GROUP, LLC; LETICA CORPORATION; LETICA RESOURCES, INC.; PLIANT, LLC; ROLLPAK CORPORATION; F&S TOOL, INC.
Reel/Frame 071168/0009 →
RELEASE OF SECURITY INTEREST
Recorded May 5, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071168/0495 →
RELEASE OF SECURITY INTEREST
Recorded May 4, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071165/0753 →
RELEASE OF SECURITY INTEREST
Recorded May 4, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071165/0634 →
RELEASE OF SECURITY INTEREST
Recorded May 3, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL & SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.
Reel/Frame 071165/0323 →
RELEASE OF SECURITY INTEREST
Recorded May 3, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL & SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071165/0464 →
RELEASE OF SECURITY INTEREST
Recorded May 3, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071165/0365 →
RELEASE OF SECURITY INTEREST
Recorded May 3, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071165/0259 →
PARTIAL RELEASE OF SECURITY INTEREST IN PATENTS
Recorded May 2, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071161/0598 →
PARTIAL RELEASE OF SECURITY INTEREST IN PATENTS
Recorded May 2, 2025
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
Reel/Frame 071161/0202 →
RELEASE OF SECURITY INTEREST
Recorded Nov 5, 2024
From: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
To: BERRY FILM PRODUCTS COMPANY, INC.; AVINTIV SPECIALTY MATERIALS, LLC (F/K/A AVINTIV SPECIALTY MATERIALS INC.; F/K/A POLYMER GROUP, INC.); FIBERWEB, LLC.; PROVIDENCIA USA, INC.
Reel/Frame 069306/0067 →
SECURITY INTEREST
Recorded May 30, 2024
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS, LLC; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC; LETICA CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
Reel/Frame 067589/0371 →
SECURITY INTEREST
Recorded Jan 19, 2024
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
Reel/Frame 066354/0346 →
FIRST LIEN INTELLECTUAL PROPERTY SECURITY AGREEMENT
Recorded Jun 22, 2023
From: AVINTIV SPECIALTY MATERIALS INC.; BERRY FILM PRODUCTS COMPANY, INC.; BERRY GLOBAL, INC.; FIBERWEB, LLC; LETICA CORPORATION
To: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH; BANK OF AMERICA, N.A., AS ABL COLLATERAL AGENT
Reel/Frame 064067/0413 →
CORRECTIVE ASSIGNMENT TO CORRECT THE LISTING OF PATENTS PREVIOUSLY RECORDED AT REEL: 058954 FRAME: 0677. ASSIGNOR(S) HEREBY CONFIRMS THE FIRST LIEN PATENT SECURITY AGREEMENT.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 064053/0867 →
CORRECTIVE ASSIGNMENT TO CORRECT THE LISTING OF PATENTS PREVIOUSLY RECORDED ON REEL 054840 FRAME 0047. ASSIGNOR(S) HEREBY CONFIRMS THE FIRST LIEN PATENT SECURITY AGREEMENT.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 064142/0855 →
CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NUMBERS PREVIOUSLY RECORDED AT REEL: 056759 FRAME: 0001. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY INTEREST.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 064050/0377 →
CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NUMBERS PREVIOUSLY RECORDED AT REEL: 055009 FRAME: 0450. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 064050/0207 →
CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NUMBERS PREVIOUSLY RECORDED AT REEL: 055616 FRAME: 0527. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY AGREEMENT.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 064050/0620 →
CORRECTIVE ASSIGNMENT TO CORRECT THE LISTING OF PATENTS PREVIOUSLY RECORDED AT REEL: 055742 FRAME: 0522. ASSIGNOR(S) HEREBY CONFIRMS THE FIRST LIEN PATENT SECURITY AGREEMENT.
Recorded Jun 21, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 064053/0415 →
SECURITY INTEREST
Recorded Mar 31, 2023
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL & SCREEN, INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION
Reel/Frame 063348/0639 →
CORRECTIVE ASSIGNMENT TO CORRECT THE THE LISTING OF PATENTS PREVIOUSLY RECORDED AT REEL: 055009 FRAME: 0450. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT.
Recorded Jan 31, 2022
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 058954/0677 →
CORRECTIVE ASSIGNMENT TO CORRECT THE THE LISTING OF PATENTS PREVIOUSLY RECORDED AT REEL: 054840 FRAME: 0047. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT.
Recorded Jan 31, 2022
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 058954/0581 →
SECURITY INTEREST
Recorded Jul 3, 2021
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; AVINTIV SPECIALTY MATERIALS INC.; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 056759/0001 →
CORRECTIVE ASSIGNMENT TO CORRECT THE LISTING OF PATENTS PREVIOUSLY RECORDED AT REEL: 054840 FRAME: 0047. ASSIGNOR(S) HEREBY CONFIRMS THE FIRST LIEN PATENT SECURITY AGREEMENT.
Recorded Mar 11, 2021
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 055616/0527 →
CORRECTIVE ASSIGNMENT TO CORRECT THE LISTING OF PATENTS PREVIOUSLY RECORDED ON REEL 055009 FRAME 0450. ASSIGNOR(S) HEREBY CONFIRMS THE FIRST LIEN PATENT SECURITY AGREEMENT.
Recorded Mar 11, 2021
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 055742/0522 →
FIRST LIEN PATENT SECURITY AGREEMENT
Recorded Jan 15, 2021
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 055009/0450 →
FIRST LIEN PATENT SECURITY AGREEMENT
Recorded Dec 23, 2020
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL AND SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.; LETICA CORPORATION
To: U.S. BANK NATIONAL ASSOCIATION
Reel/Frame 054840/0047 →
FIRST LIEN PATENT SECURITY AGREEMENT
Recorded Jan 6, 2020
From: BERRY GLOBAL, INC.; BERRY FILM PRODUCTS COMPANY, INC.; BPREX HEALTHCARE PACKAGING INC.; PRIME LABEL & SCREEN, INC.; AVINTIV SPECIALTY MATERIALS INC.; PRIME LABEL & SCREEN INCORPORATED; PLIANT, LLC; FIBERWEB, LLC; BERRY GLOBAL FILMS, LLC; PROVIDENCIA USA, INC.
To: U.S. BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 051485/0318 →
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Apr 19, 2019
From: VARADARAJAN, KRISHNARAJU; MERRIMAN, DANIEL L.; MAMISH, ABBOUD
To: BERRY GLOBAL, INC.
Reel/Frame 048934/0605 →