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Die for coating suspensions with flow obstruction device and method of use

A mold and coating technology, which is applied to the device and coating of the surface coating liquid, can solve the problems of low mold inlet flow rate, limiting the coating speed of the coater, etc.

Active Publication Date: 2017-08-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another approach is to design for a low die inlet flow rate, but this has inherent disadvantages as it limits the potential coating speed of the coater
Other approaches related to the formulation of the coating composition itself also have limited applicability

Method used

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  • Die for coating suspensions with flow obstruction device and method of use
  • Die for coating suspensions with flow obstruction device and method of use
  • Die for coating suspensions with flow obstruction device and method of use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051] Embodiment 1: A single cavity slot die for coating a particulate suspension comprising:

[0052] an upper mold section and a lower mold section, the upper mold section having a mold width;

[0053] means for spacing the upper mold section and the lower mold section to form a coating cavity and a coating slot having a coating slot height when assembled;

[0054] a feed inlet in the lower die section centered along the die width for feeding the center of the coated die cavity; and

[0055] flow resistance device;

[0056] wherein the feed inlet has a feed inlet flow direction and a feed inlet diameter in a plane orthogonal to the feed inlet flow direction, and

[0057] wherein the coating cavity has a cavity height that varies along the flow direction of the feed inlet, and

[0058] wherein the flow resistance device comprises a support member attached to the lower mold portion at an attachment point within the coating cavity, the attachment point being centered along ...

Embodiment approach 2

[0060] Embodiment 2: The single cavity slot mold of embodiment 1, wherein the means for spacing the upper mold portion and the lower mold portion is one or more spacers.

Embodiment approach 3

[0061] Embodiment 3: The single cavity slot mold of Embodiment 1, wherein the deflection member is planar.

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Abstract

A center-fed single cavity slot die (100) for coating particulate suspensions without creating the coating defect known as center banding. The die has a flow obstruction device (109) located in the die cavity (105) in a position such that the flow obstruction device blocks undisturbed straight-line flow of coating composition from the feed inlet to the die coating slot. Also, a coating process that employs the disclosed coating die. Types, shapes, sizes, and compositions of particles that may be used, and viscosities and particle concentrations of the coating composition which may be used.

Description

technical field [0001] The present invention relates to dies and methods for coating particulate suspensions. Background technique [0002] Single cavity slot dies are often used to apply compositions to substrates due to their simplicity and ease of use. Center-fed, single-cavity slot molds are particularly simple to design and operate. However, difficulties can arise and coating defects can be introduced when the coating composition to be applied contains suspended particulate matter such as nanoparticles, conventional powders, or microspheres or beads. [0003] One such defect is the formation of a central band. When coating a substrate web, the formation of a central band occurs in the band along the center of the web as a band of higher concentration of the coating particulate component coincides with the center of the coating die. It is believed that the formation of the central band occurs because of the higher velocity of a center-fed die along a portion of the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C5/02B05C11/10
CPCB05C5/0254B05C11/1002
Inventor 克里斯·J·坦雷洛里·T·霍姆斯迈克尔·J·蒂希
Owner 3M INNOVATIVE PROPERTIES CO