Paper/Converting
 
 
  Animal Food Products
  Chemicals
  Human Food Products
  Minerals
  Paper/Converting
  Snack Food
  Tobacco Products
  Wood Products
  Textiles
  Renewable Energy
 
   

 

 

 
Pressure Sensitive Adhesives  

Pressure sensitive adhesives are a unique form of adhesive that are permanently tacky at room temperature. They adhere to substrates under pressure via polar attractive forces rather than forming chemical bonds. The two most common types are rubber and acrylic based. The rubber based adhesive is more economic, but lacks the physical and chemical stability of the acrylic based adhesive. There are three distinct ways of applying PSAs:

• In solvent – the adhesive ingredients are polymerized in solvent, then cast onto the web
• As hot melt - hot melt is coated onto the web then cooled before/during wind-up
• Emulsion based – the adhesive ingredients are polymerized in water, cast on the web,
and dried

PSAs can be single coated, double coated, pattern coated and self wound:

Single coatings are bonded to one surface, referred to as the face stock, typically film, PE foam, paper, tissue or non-woven. A release liner, silicone coated, PET ,PE or poly coated Kraft is applied to protect the adhesive layer.

Double coatings are used to bond two substrates, different PSAs can be used on each side of a carrier (typically plastic film, tissue or non-woven material), the carrier add strength to the adhesive configuration.

Transfer tape is unsupported adhesive film, it is coated onto a release liner. Used in medical packaging, it is frequently pattern coated.

Self wound systems comprise face stock coated with PSA on one side, and silicone release on the other. Examples include diaper tapes and short roll lengths of tape.

PSAs are used in the manufacture of specialty tapes, medical packaging, surgical drapes and laminated film.

Measurement of coat weight is important for 2 main reasons:

1. Adhesive coating needs to be uniform in the area to which it is applied, to provide a high coefficient of adhesion between the two substrates.
2. To minimize usage of costly acrylic, the aim is to apply the minimum quantity of coat weight in order to achieve adhesion.

Manufacturing Process
This varies according to the product being manufactured, but essentially the solvent based and aqueous based adhesives are applied through an excess application system such as a meyer bar coater, or a metered system, such as a transfer coater or gravure roller, hot melts are applied via an extrusion coater.

Manufacturing Process
The possibilities vary according to the process, but if the PSA is applied in aqueous soln, the most accurate measurement is made wet-end, measuring water and inferring dry coat weight from the solids ratio %.

Dry end measurements are made on hot melt PSAs, and on solvent based systems to avoid the need for Nema 4 sensor housing for the latter.

Solvent wet end is feasible, especially if coat weight is low, but solvent ratios have to be maintained, and sampling errors can be significant if not carefully controlled.

 
 
Measurement Performance
Measurement Range % Typical Accuracy %
Rubber adhesive (dry end) 5-50 gsm +/- 0.3 gsm
Acrylate adhesives (dry end) 10-30 gsm +/- 0.3 gsm
Adhesives (water based wet end) 5-50 gsm +/- 0.15 gsm
Adhesives (solvent based wet end) 5-50 gsm +/- 0.25 gsm
 
 
Application Photos
     
 
     
 
   
 
 
  FOLLOW US ONLINE:  
       
 
             
MCT460   MCT460-WP   MCT460-T   MCT330HD   MCT466SF   MCT466QC   GUARDIAN  
 
 
 
HOME COMPANY PRODUCTS APPLICATIONS AGENTS NEWS BLOG FAQS CONTACT CLIENT LOGIN
 
 
 
 
  MCT460
Moisture Transmitter
MCT460-T
Tobacco Moisture Transmitter
MCT460-WP
Wood Products Moisture Transmitter
MCT466 QuikCheck
Rugged NIR Tester
GUARDIAN
Scanning Frame System
UNITED STATES
Process Sensors Corp.
113 Cedar Street
Milford, MA 01757 USA
Tel: (508) 473-9901
Fax: (508) 473-0715
http://www.processsensors.com
info@processsensors.com
EUROPE
Process Sensors Europe
Unit 4, Adelaide House
Corbygate Business Park
Corby, Northants NN17 5JG
United Kingdom
Tel: 01536-408066
Fax: 01536-407813
http://www.processsensors.co.uk
infouk@processsensors.com
EASTERN EUROPE
Process Sensors Polska
Ul. Modlinska 310/312 lokal 216
03-152 Warszawa
Poland
Tel: (48) 22 6739526
Fax: (48) 22 6739527
Gsm: (48) 509 202759
http://www.processsensors.pl
tomasz@processsensors.com
ASIA
Process Sensors Asia
PT 2328 Pinggiran Golf
Kemumin, Pengkalan Chepa
Kota Bharu, Kelantan 16100
Malaysia
Tel: 011 60 17620-2806
Fax: 011 60 6601 4588
http://www.processsensors.com
hussin@processsensors.com
 
   
  Copyright 2014 ProcessSensors.com All rights reserved. Terms of Use | Privacy Policy | Sitemap  
   
  Process Sensors Moisture Transmitters

MCT 460: Used in a wide variety of industrial processes, the MCT 460 Multi-Constituent NIR Transmitter, a True Stand-Alone Transmitter, provides off-line accuracy under on-line operating conditions. Read more about the MCT 460 moisture sensors...

MCT 460-T: The MCT 460-T measures moisture... the most critical variable in tobacco processing... providing the world's most accurate, reliable and stable moisture measurement for the tobacco industry. Read more about the MCT 460-T moisture measurement tool...

MCT 460-WP: The MCT 460-WP uses a well proven algorithm which works on a wide range of wood varieties and forms. You choose the mode of operation, stand-alone or networked. Read more about the MCT 460-WP moisture measurement tool...

MCT 330HD: The MCT 330HD features a heavy duty stainless steel enclosure, is resistant to high temperatures, is sealed for wash down environments, and provides reliable, continuous moisture measurement. Read more about the MCT 330HD moisture measurement tool...

MCT 466-SF: The MCT 466-SF features a food grade optical window, a robust stainless steel enclosure, and reliably operates in high temperature locations, measuring moisture, oil & product temperatures. Read more about the MCT 466-SF moisture measurement tool...

MCT 466 QuikCheck: Used for quality control in a wide variety of industrial processes, the MCT 466 QuikCheck bench top NIR Tester provides fast accurate results every time. Read more about the MCT 466 QuikCheck moisture analyzer...

GUARDIAN: The Guardian Scanning Frame System is comprised of three components: MCT-460 NIR Transmitter, the automated Scanning Frame and a PC with Automated Guardian Profile Software. Read more about the GUARDIAN Scanning Frame System...