# US 9,751,721 B1 · Core for winding elastomeric yarns

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- Number: US 9,751,721 B1
- Document ID: US9751721B1
- Status: Granted
- Kind: B1
- Application number: 15/240,353
- Filed: 2016-08-18
- Granted: 2017-09-05
- Earliest claimed: 2016-08-18
- Assignees: Sonoco Development, Inc.
- Applicants: Sonoco Development, Inc.
- Inventors: Ismael Antonio Hernandez
- Web page: https://patentgrep.com/patent/US9751721B1

## CPC

- B65H 75/10: without flanges, e.g. cop tubes
- B65H 2701/319: Elastic threads
- B65H 2701/5112: Paper or plastic sheet material
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES

## Abstract

A paperboard core is described above that is designed to receive a yarn wound thereon, such as an elastomeric yarn that relies on friction for proper winding of the yarn onto the core. In particular, the core includes a clay-coated paper outer ply which is capable of providing direct frictional engagement of the core with the yarn, such that the yarn is windable on the core via direct contact between the clay-coated outer ply and the yarn. In this way, there is no need to use a film on the outer surface of the core in order to obtain the desired frictional properties that will result in proper winding of the yarn onto the core.

## Claims

### Claim 1

A paperboard core configured to receive a yarn wound thereon, wherein the core comprises a clay-coated paper outer ply, wherein the outer ply is configured to provide direct frictional engagement of the core with the yarn, such that the yarn is windable on the core via direct contact between the clay-coated outer ply and the yarn.

### Claim 2 (depends on 1)

The core of claim 1 further comprising a layer of adhesive between at least one inner ply and the outer ply.

### Claim 3 (depends on 1)

The core of claim 1, wherein the outer ply comprises Precipitated Calcium Carbonate (PCC), china clay, latex, or any combination thereof.

### Claim 4 (depends on 1)

The core of claim 1 further comprising an overcoating applied to an outer surface of the outer ply.

### Claim 5

A paperboard core configured to receive a yarn wound thereon, wherein the core comprises:
at least one inner ply; and
an outer ply disposed adjacent to the at least one inner ply, wherein the outer ply comprises clay-coated paper,
wherein the outer ply is configured to provide direct frictional engagement of the core with the yarn, such that the yarn is windable on the core.

### Claim 6 (depends on 5)

The core of claim 5, wherein the yarn is an elastomeric yarn.

### Claim 7 (depends on 5)

The core of claim 5 further comprising an ink layer printed on an outer surface of the outer ply.

### Claim 8 (depends on 5)

The core of claim 5, wherein the outer ply is spirally wound onto the at least one inner ply.

### Claim 9 (depends on 5)

The core of claim 5 further comprising an overcoating applied to an outer surface of the outer ply.

### Claim 10 (depends on 9)

The core of claim 9, wherein the overcoating is configured to act as a barrier against chemicals from the yarn passing into the core when the yarn is wound onto the core.

### Claim 11 (depends on 9)

The core of claim 9, wherein the overcoating is configured to enhance the frictional engagement of the core with the yarn.

### Claim 12 (depends on 5)

The core of claim 5 further comprising a layer of adhesive between the at least one inner ply and the outer ply.

### Claim 13 (depends on 5)

The core of claim 5, wherein the outer ply comprises Precipitated Calcium Carbonate (PCC), china clay, latex, or any combination thereof.

### Claim 14

A method of making a paperboard core configured to receive a yarn wound thereon, the method comprising disposing an outer ply adjacent to at least one inner ply, wherein the outer ply comprises clay-coated paper, wherein the outer ply is configured to provide direct frictional engagement of the core with the yarn, such that the yarn is windable on the core via direct contact between the clay-coated outer ply and the yarn.

### Claim 15 (depends on 14)

The method of claim 14, wherein disposing the outer ply adjacent to the at least one inner ply comprises spirally winding the outer ply onto the at least one inner ply.

### Claim 16 (depends on 14)

The method of claim 14 further comprising applying an adhesive layer between the at least one inner ply and the outer ply.

### Claim 17 (depends on 14)

The method of claim 14 further comprising applying an overcoating to an outer surface of the outer ply.

### Claim 18 (depends on 17)

The method of claim 17, wherein the overcoating is configured to act as a barrier against chemicals from the yarn passing into the core when the yarn is wound onto the core.

### Claim 19 (depends on 17)

The method of claim 17, wherein the overcoating is configured to enhance the frictional engagement of the core with the yarn.

### Claim 20 (depends on 14)

The method of claim 14 further comprising applying an ink layer to an outer surface of the outer ply.