Roll mold and manufacturing method therefor, and transfer sheet

Patent metadata

Field	Value
Publication number	US-12186972-B2
Application number	US-202117907671-A
Country	US
Kind code	B2
Filing date	Apr 5, 2021
Priority date	Apr 8, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

Provided is a roll mold that has a plurality of linear grooves arranged side by side on its outer peripheral surface and in which an optical step between adjacent linear grooves is sufficiently small. A roll mold comprising, on an outer peripheral surface thereof, n linear grooves extending in a roll axial direction or a direction inclined with respect to the roll axial direction and arranged side by side, where n is 800 or more, wherein the n linear grooves are arranged in a manner that a gradual decrease and a gradual increase in groove depth are repeated, and the number of points at which a transition from the decrease to the increase in groove depth occurs is m or less, where m is selected from 2 to 8.

First claim

The invention claimed is:

1. A roll mold comprising, on an outer peripheral surface thereof, n linear grooves extending in a roll axial direction or a direction inclined with respect to the roll axial direction and arranged side by side, where n is 800 or more,
wherein the n linear grooves are arranged in a manner that a gradual decrease and a gradual increase in groove depth are repeated, and the number of points at which a transition from the decrease to the increase in groove depth occurs is m or less, where m is selected from 2 to 8.

2. The roll mold according to claim 1 , wherein a difference in groove depth between at least one pair of adjacent linear grooves is less than or equal to (D max −D min )/n×2m, where D max is a groove depth of a deepest linear groove and D min is a groove depth of a shallowest linear groove of the n linear grooves.

3. The roll mold according to claim 2 , wherein a difference in groove depth between every pair of adjacent linear grooves is less than or equal to (D max −D min )/n×2m.

4. The roll mold according to claim 1 , wherein n is 800 or more and 100000 or less.

Assignees

• Dexerials Corp

Inventors

• Doi Katsuhiro
• Noda Kazuhiko

Classifications

• B29C33/42 Primary

  characterised by the shape of the moulding surface, e.g. ribs or grooves · CPC title

• B29D7/01

  Films or sheets · CPC title

• B29C59/04 Primary

  using rollers or endless belts · CPC title

• B23D5/02

  involving rotary and straight-line movements only, e.g. for cutting helical grooves · CPC title

• B23D1/12

  with the tool supported only on one side of the bed · CPC title