Frequently Asked
Questions

General Questions

Below are the collection of questions commonly asked by our customers.
We will try to add more questions (and their solutions) when we receive more requests from them.

Q. How do I extend the stability of my pre-catalyzed wood glue?

There are many methods to make minor improvements in the pre-catalyzed wood glue's stability. However, the most significant improvements should start with the base emulsion.

GB's new cross-linkable polyvinyl acetate emulsion, GB Latex 0048CR base emulsion and ready-to-use GB Bond 699 adhesive deliver an outstanding pre-catalyzed storage stability. These products alone can fulfil European EN 204 C D3 bond requirements while offering a shelf life in excess of six months.

Q. What is the role of "Humectant" used in the water based adhesives?

A Humectant is a hydroscopic substance that absorbs and retains moisture from the atmosphere. In water-based adhesives, the Humectant prevents the surface of the adhesives to form a skin by keeping it wet.

By retarding drying, the Humectant also slows the adhesive's setting speed and extends its open time. In addition, the Humectant allows easier clean up of built-up adhesives.

Q. How do I produce an "acid-free" adhesive?

Acid-free is referring to a term describing materials with a pH value of 7.0 or higher. Adhesive products, which mainly use a Polyvinyl Acetate homo-polymer or Ethylene vinyl acetate co-polymer base, commonly are mild acetic with a pH value of 4.0 - 5.0.

A buffering agent, such as sodium acetate or a small amount of sodium bicarbonate, is added to the formulation to reach the neutral pH. The principle here is the same as when a person has gastric and he takes an antacid, which neutralizes the acid and makes him feel better.

Q. What are the general requirements that MUST be fulfilled for a window patching adhesive?

Window patching adhesives must fulfil the following requirements:

  • Ensure good bonding of paper to different types of film (glassine/synthetic)
  • The adhesive must not cause discolouriation of the envelope
  • The adhesive must not splash, and have good roller stability and low foam foaming
  • The adhesive must have the right wet tack strength to immediately adhere to the window film on the paper
  • The adhesive must have a high-solid content with anti-wrapped properties
GB window patching adhesives, GB Bond, is a co-polymer emulsion specially developed for different machines, paper and application systems.

Q. How do I calculate the glue consumption in Finger Jointing?



W = Width of lamellas in meter 48mm
Lf = Average Length of lamellas to be jointed 300mm
N = Number of fingers in lamellas 20
Lw = Length of finger 8mm
GA = Glue Amount 200gsm

Glue Consumption per m3 when Finger Jointing:

FORMULATION:

2 x Lf x GA x N
=
kg/m3
W x Lw
2 x 0.008m x 0.2kg/m2 x 20
=
4.4kg/m3
0.048m x 0.3m