Two layer paper product for printing

• US 5,039,378 A
• Filed: 04/16/1987
• Issued: 08/13/1991
• Est. Priority Date: 12/23/1985
• Status: Expired due to Fees

• Current Assignee: La Cellulose Du Pin
• Original Assignee: La Cellulose Du Pin
• Inventors: Pommier, Jean-Claude, Poustis, Joel
• Primary Examiner(s): Hastings, Karen M.
• Application Number:
  US07/039,076
• Time in Patent Office: 1,580 Days
• Field of Search: 162/123, 162/125, 162/128, 162/129, 162/130, 162/147, 162/181.8, 428/283, 428/288, 428/289, 428/284, 428/323, 428/342, 428/386, 428/535
• US Class Current: 162/128
• CPC Class Codes: D21F 11/04 paper or board consisting on two or more layers
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/277 Cellulosic substrate
• CPC Class Codes: Y10T 428/31982 Wood or paper

Abstract

A packing paper comprising a support layer and a coating layer. The coating layer contains minerals, which give it a white pigmentation, has a content of between 25 and 50% by weight of dry materials, has a good degree of whiteness which is at least equal to 70, and has good capacity for flexographic printing.

Claims

1. A paper product comprising a support layer and a coating layer, both based on cellulose fibers, wherein:

the support layer comprises unbleached and/or bleached, recycled or non-recycled cellulose fibers,

the coating layer comprises at least one mineral selected from the group consisting of talc, kaolin, and TiO₂ which gives it a white pigmentation, in an amount of between 25 and 50% by weight of dry matter of the layer, the remainder being long and short white cellulose fibers, with at least 25% by weight of the fibers in teh layer being long fibers having a length of greater than 4 mm,

the coating layer has a gram weight of between 25 g/m² and 70 g/m²,

the support layer has a gram weight such that the paper product has a total gram weight of between 120 g/m² and 300 g/m²,

the coating layer has a degree of whiteness, determined in accordance with standard NFQ 03.039, of at least equal to 70 and

the coating layer has a capacity for flexographic printing which is at least 0.6, as determined by measurement of the optical density using a MACBETH RD 914 densitometer on a product printed in blue with a strong weave.

2. The product in accordance with claim 1, wherein the coating layer contains said mineral in an amount of between 35% and 45% by weight of dry matter of the layer.

3. The product in accordance with claim 2, wherein said mineral is talc.

4. The product in accordance with claim 1, wherein the coating layer contains an optical bluing agent in an amount of 0.2% to 0.5% by weight of dry matter of the layer.

5. The product in accordance with claim 1, wherein the coating layer contains a synthetic or natural binding agent.

6. The product in accordance with claim 5, wherein said binding agent is present in an amount of less than 10% by weight of dry matter of the layer.

7. The product in accordance with claim 6, wherein said binding agent is present in an amount of from 5 to 8% by weight.

8. The product in accordance with claim 6, wherein said binding agent is starch.

9. The product of claim 1, wherein said support layer further comprises synthetic fibers.

10. The product of claim 1, wherein at least one major face of said product contains a hydrophobic adjuvant which has been applied by a size-press treatment.