Search

A Recipe for Scratching

(Web Handling)

April 30, 2008, ... Use air or fluid to fully lubricate the web/roller interface. For narrow and stiff webs, use an undercut or dumbbell-shaped roller that makes contact only at the web edges. Use a tenter or edge nips to ...

What's New Product

(New Products)

February 29, 2008, ...  Precision AirConvey | 302-999-8000 | www.airconvey.com PFFC-ASAP 416 Nip Rolls Have Many Uses Nip rolls are said to be durable and are designed for a variety of converting applications, including ...

Web Handling and Converting, and Winding Courses

(Archive)

February 18, 2008, ... to understand most web manufacturing and converting machines, such as coaters, laminators, printers, and winders. These must-know topics include rollers, controls, nips, spreading, slitting, wrinkling, ...

Web Lines: Thinking About New Equipment?

(Web Handling)

January 31, 2008, ... needs, including number of zones, preferred tension feedback by zone, and drive roller traction preferences. (I like to avoid nipped drive rollers). Include the proposed tension control plan in the specification ...

Roll Winding Dynamics

(Web Handling)

January 31, 2008, ... share of nip pressure, which may damage delicate materials; diametrical variations can result in an uneven stretching of the web around the roll so that the appearance of bagginess becomes a cause for ...

Get a Grip: Driving Your Web

(Archive)

December 31, 2007, ... for driving a web between tension zones include the following: Unnipped rollers Simple, usually with a larger wrap angle and high traction surface (rubber with a roughness or groove pattern). These ...

Parallel Protocol

(Web Handling)

December 31, 2007, ... each time.) Finally, rolls that can be nipped and are used to apply a layer of coating onto a substrate, as shown in Figure 5, can have misalignment problems that lead to uneven coating thickness. This ...

Differential Winding Limits: Part II

(Magazine)

November 30, 2007, ... or high winding nip loads. Radially Loading Systems In radially loaded shafts, the torque applied to a core is proportional (or nearly so) to the number of elements that grab the core, and each core ...

New Products, Part 1

(Magazine)

October 31, 2007, ... sensor is analyzing and to provide higher accuracy and speed. EMX Industries | 216-518-9888 | emxinc.com | PFFC-ASAP 404 Measure Nip Width Instantly The P-Nip handheld measurement device allows ...

WHAT'S NE

(Magazine)

August 31, 2007, ... Proofing head works in combination with system’s precision speed and nip controls so operators can build an accurate fingerprint of any print station. Integrity Engineering | 763-856-4040 | perfectproofer.com ...

Baggy Webs: Part 4 Minimizing

(Archive)

July 31, 2007, ... your machines to baggy webs? Increase Tension—Pull out length variations. Bagginess that is pulled out with tension usually is not a problem. Eliminate Nips—If tension doesn’t pull out your bagginess, ...

Under Pressure (A Brighter Look)

(Archive)

May 31, 2007, ... this possibility, but my eagerness to share a valued concept gave me the courage to share some results of my analysis of how to combine nip load and footprint calculations to find nip pressure. Fortunately, ...

Baggy Webs: Part II Measuring

(Archive)

April 30, 2007, ... or by time. Regarding baggy webs, what should you measure? Bagginess by itself isn't usually a problem until 1) you try to run the baggy web through a nip, or 2) it is so bad the web wrinkles or your ...

Baggy Webs: Part I Nightmares

(Archive)

March 31, 2007, ... all baggy webs will have trouble running through nips without wrinkles. I hate to leave you with these nightmares, but you must face your demons before you can exorcise them. Over the next three columns, ...

Under Pressure (Revisited...and Revised)

(Archive)

February 28, 2007, If I have any repeating theme to understanding web handling, it is to follow the stresses and strains. In nipped processes, you need to follow the compressive stress (aka pressure). Web Lines (Corrected ...

Reader's Choic

(Magazine)

February 28, 2007, ... 306. webexinc.com Manipulate Rolls Easily Vertical Center Lifts grip rolls from inside the core for safe and easy roll handling with the assistance of overhead cranes or hoists while keeping roll ...

Twist & Shout

(Web Lines)

December 31, 2006, ... compensate for web bagginess, such as having an end-pivot roller upstream of a nip point. Twisting is used in some simple in-line folding processes, either twisting one-half of a web 180 deg to the other ...

Web Tension: A Pop Quiz

(Web Lines)

September 30, 2006, ... won't need a tenfold tension increase. Step 3: Bonus round (possible 10 points) Do you prefer unnipped or vacuum drive rollers over nipped drive rollers? (1 point) Have you used the belt equation ...

CPP: Season Two

(Magazine)

September 30, 2006, ... on the hottest topic related to both winding and wrinkling: baggy webs. Learn how winding can create baggy webs; and how to measure and handle baggy webs — especially in nipped roller processes.  ...

What's Ne

(Magazine)

August 31, 2006, ... positioning for manipulation and lithography. PFFC-ASAP 497 Accessory for Static Control Simco Industrial Static Control, Hatfield, PA; 215/822-6401; www.simco-static.com The Junction Box is for ...