SHARE BLOG

Ultrasonic welding is an industrial technique whereby high frequency ultrasonic acoustic vibrations are locally applied to workpieces being held together under pressure to creat a solid-state weld. It is commonly used for plastics, however, ultrasonic-welding techniques can also be used to weld mesh, cut mesh into different shapes and weld mesh into tubes.

For most of clients who are new to silk printing, the first thing you might have in mind is " Which mesh shoud i choose for my print?", as a screen mesh supplier, sharefilters would like to share some general knowledge about mesh selection

By incorporating capabilities in production of filter material, including filter meshes and filter felts with rating from 5um to 2000um and from 1um to 300um respectively, SHARE takes full advantage of her capabilities and know-how in the filtration industry, SHARE produces various kinds of filter bags made of both monofilament/multifilament filter meshes and needle-punched filter felts. The filter bags are of standard style and sizes and can be produced upon clients' request (customised filter bags).

Stencil Terminology

EOM “Emulsion Over Mesh.” Proper EOM is typically 10 - 25% of

mesh thickness (ft).

Rz Surface roughness of the print side. A stencil with a low Rz

value has a smooth surface (desireable Rz < 5).

As a filtration and separation material provider, SHARE has been striving hard to research and develop new filter material for the industry. In the past, market is limited in supplying small micron rated filter meshes due to technical reasons, such as weaving machines, raw material (yarns/threads), reeds, etc, this market is always occupied by foreign companies, and the cost is very high for the buyers.

In the past year of 2016, SHARE has been closely working with our clients on the needs for the markets worldwide in the industry of dust collection, liquid filtration and screen printing, esp. molded plastic filters.

MESH TO MICRON CONVERSION CHART

Introduction:

Biopsy Bags are made of quality nylon. (Ultrasonic-welding)

Reduce risk of small specimen loss.

Design allows unrestricted fluid movement around tissue.

Bags peel open esaily for quick and easy specimen removal.

Available with or without flap (7mm flap)

Mesh preparation
Abrasion and degreasing to make the mesh more receptive to stencil adhesion.

This variable precedes the discussion of other stencil variables because it is the source of various common stencil-breakdown problems-pinholes, fisheyes or poor stencil adhesion to the mesh-often blamed on the emulsion itself. The screen mesh must be prepared for stencil application by, in some cases, abrading and, in all cases, degreasing.

One of the speciality of SHARE is insert-molding and over-molding plastics with screens/meshes, products made out of insert/over-molding can filter out fluid contaminants and reduce products failure and save time and money for our clients.

Mesh tension: A measure of mesh deflection expressed in terms of Newtons per centimeter (N/cm). 

Tension should be looked at in two ways: the initial stretching and re-tensioning of mesh on your frames, and the ways in which tension interacts with other variables during printing. It's difficult to understand its dynamics without looking at tension relative to off-contact distance and squeegee-blade pressure, so be sure to visit those variables after you've read about this one.

The twofold job of mesh tension is to provide resistance for the blade-to be overcome only at the point where the blade forces mesh-to-substrate contact-and to pull the mesh out of the ink film after the blade passes.

Weave structure

Plain weave versus twill weave.

With plain weave, each thread goes under one perpendicular thread and over the next. With twill weave, a given thread follows an under-one/over-two pattern.

Mesh counts higher than 305 may be woven with plain or twill patterns. Twill mesh typically deposits more ink than the same or even a lower mesh count of plain weave.

Mesh opening

The dimensions of the mesh openings affect stencil support, meter ink flow and contribute to the print's appearance.

The best mesh for screen printing is commonly woven out of monofilament polyester and it functions both as support for the stencil and to meter the amount of ink deposited on the substrate. The dimensions of the mesh count, percentage of open area and thread thickness all contribute to the appearance of the end product. You will find that accurate measurements of these mesh specifications are supplied by the manufacturer. Poor image registration, image elongation and uneven ink deposits can result from the improper selection or preparation of the mesh fabric.

Thread structure

The differences between multi-filament and mono-filament screen-printing mesh.

Here is an easy choice: when faced with multi-filament and monofilament polyester mesh, pick high-quality monofilament. Man-made fibers are made with either multiple or single filaments. Monofilament is a single smooth round fiber used in weaving mesh.

Mesh-fiber composition

The molecular and mechanical characteristics of screen-printing mesh.

At present, the only suitable, modern mesh fiber is high-quality monofilament polyester: round and smooth. It has superior elongation and strength characteristics, has no loss of strength when wet and, in fact, absorbs less than 0.8 percent moisture. Absorption of moisture is an important consideration, as this is such a wet process.

Question

When printing four-color process, we know the importance of the angles used for the dots on the color separations. We also know we have to avoid certain combinations of mesh count with dots per inch on the positive in order to avoid moiré. What we are looking for are some guidelines on which mesh specification is most suitable for printing four-color process, and how fine a dot we should be able to hold.

To all of our clients, friends and potential clients, thanks for your business in the past year and SHARE appreciates your support, cooperation and understanding. On behalf all of our employees, we would like to extend our Chinese New Year greetings to our clients, friends.

2014 is gone and 2015 has come upon us. SHARE would like to take this opportunity to wish all of our clients, friends a very HAPPY NEW YEAR.

Wish all of you a Healthy, Happy and Prosperous Year!

Water Based Ink vs Plastisol

Water-based ink versus plastisol: one is made of water and one is made of plastic. Simple. But while the difference is easy enough to read in the names, how this difference impacts your screenprint takes a little more research. We're going to look more in depth at each type, advantages and disadvantages, and use the differences to see which one would work best for you.

Frames

There are two types of screen frames, metal and wood. Metal frames, both static (solid) and retentionable, have become the industry standard. Retentionables do not require the use of adhesive products.

Metal frames have been replaced by wood because they do not warp from water like wood frames do. The most commonly used types of wood are cedar and pine. Pine is preferred because it is more water resistant while it is light weight.