Separate Gum for Pasting and Corrugation (Cold Process)

Moisture Resitant Gum Powder

Moisture in the paper board is the main problem of corrugators. Most of the gum powders available in the market are fast curing but gain moisture even after drying in humid climatic condition. Gaining of moisture in the box results in negative bursting and compression strength.

Corrugators either use high B/F and High GSM papers or high solids gum to get desired bursting and compression to the box. But if gum is hygroscopic then box is bound to gain moisture even after complete drying.

By using grodex moisture resistant grades, corrogators can use lower B/F and lower GSM and still get higher bursting and compression to the box

We have developed both pasting and corrugationAdhesives which will not attract moisture once dried fully and therefore guarantee positive bursting and compression to the box.

Moisture Resistant Adhesives

Technical Comparison

Technical Comparison of Results of Grodex Moisture Resistant Grade Powder Adhesives and Other gum Powders otherwise available in the market.

Sr.No. Particulars Grodex Moisture Resistant Grades Other Gum Powders Available in the Market
1 Base Tapioca Starch, Maize Starch, Cassava. Maize Starch and Different Flours
2 Fillers It is 100% pure starch product and no filler added to increase weight. These fillers do not play any role in quality of box. Due to which price remains high as compared to other gum but guarantees exceptional fast and permanent drying, high pin adhesion which in turn results in higher BS and CS of box. Different fillers are added such as as flours, Urea, Sault, Dolomite powder etc. to increase weight and to reduce price.  Price of all such fillers ranges from Rs.3 to Rs.6 per Kg. In fact these fillers causes major quality issues such as slower drying, less adhesion, moisture gaining etc. which in turn causes lower BS and CS of box.
3 Moisture % in Powder Less than 2%
Very low moisture gives you maximum starch per kg weight and thus allows you to get better solid percentage in liquid gum prepared by you.
Not Less than 10%
Very high moisture percent in powder, increases weigh and allows them to further reduce prices or to increase margins. Due to high moisture percent in powder you get comparatively lower solid percent in the liquid gum prepared by you.
4 Water mixing Ratio 1 : 4
Due to low water mixing ratio you get better solids in gum  which allows –
  • Faster Drying
  • High pin adhesion
  • No Warp to sheet
  • No Wash Board
1 :5 or even more
Due to high water mixing ratio you get lower solids in Gum which allows –
  • Slower Drying
  • Low pin adhesion
  • Warp to the sheet
  • Wash Board to sheet
5 Chemicals No chemical is used in the process or even after process of starch. Starch is heated and cooled down in different temperatures to achieve 100% water solubility. Process is very lengthy and takes up to 21 hours for batch processing. Causes lower production per day and high cost of production. No use of Sodium Hydroxide guarantees no further moisture gain in the box. Mainly Sodium Hydroxide (Caustic Soda) is used in the process to prepare gum.  With this process it is very easy and faster (takes only 2 to 3 hours) to process a batch. Which facilitates more production per day and low cost of production. Sodium Hydroxide is hygroscopic and regains moisture in box even after drying.
6 pH 6 to 7 Near Neutral 11 to 12 Alkaline
Sometimes Urea is added to Neutralize it but it causes more moisture regain.
7 Plasticization of gum films When gum lines dry completely it forms a plasticize film which prevents moisture to regain and thus maintains high BF and high CS in any weather conditions and even in deep sea where humidity increases substantially during export journey of box. Sodium Hydroxide is hygroscopic in nature and therefore absorbs moisture in the box even after complete drying of box. Regain of moisture in box causes decrease in BS and CS of box not only in highly humid climate but even in normal weather as humidity in air always exists.
8 Increase/decrease in BS and CS Very high quality starch combinations and unique process of modification results in high BS and CS of box. Cheap fillers and caustic soda used in the making of the results in lower BS and lower CS of box.
9 VISCOSITY Corrugation  16 seconds
Pasting gum  25 seconds Very low viscosity decreases gum lift up on roller. Very low application of gum ensures –
  • Very fast drying
  • More BS and CS
  • Improvement in aesthetic value
Corrugation  30 to 35  seconds
Pasting gum  30 to 35 seconds High viscosity increases gum lift up on roller. More use of gum causes following problems –
  • Slow drying
  • Drop in BS and CS
  • Wash board and warp of sheets.
10 Faster Production Corrugation gum gives hand to hand ready liners. Dry liners with complete fiber tear is guaranteed on any paper combination without waiting time. Liners dried instantly thru heaters gives permanent bonding and guarantees no delamination even in case of side flap pasting instead of box. Due to wet liners coming out of heaters compels corrugator to wait for complete drying and thus slow production. Corrugation gum is heat sensitive and if liner do not come dry thru heaters, it never gives full CS and causes delamination. (Particularly in side flap pasting of box, corrugation is exposed and loses grip)
11 Effectiveness Grodex Powder Adhesives adds value to your box substantially and proves very much quality and cost effective in-
  • Where compression and bursting strength is important.
  • High quality or imported paper
  • Where moisture resistance is precondition.
These adhesives are useful and cost effective only when no specific quality standards are set. When only sticking is a matter in box, low price adhesives prove cost effective. Where high quality standards with guaranteed results in any weather conditions are required these adhesives either prove useless or costly.
12 Problems due to Moisture Guaranteed Moisture Resistance ensures-
  • No rusting of stitching pins
  • No fungus to the box
  • No collapse of stacked box
Moisture in box causes different problems such as –
  • Rusting of stitching pins
  • Chances of fungus to the box
  • Collapse of stacked box


Product Base Water Ratio Solids Viscosity(+-5) PH Pack
grodex Corrogum HD Tapioca 1:5 17% 17 10 35 kg
grodex Cold Paste Tapioca 1:4 20% 20 7 40 kg
100% Guaranteed Moisture Resistance and Control

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Frequently Asked Questions

Corrugated paper box is used mainly for shipping / transportation and storage of variety of items for their strength and durability. In the process of making box mainly paper and gum adhesives are major players which determine strength of the box. More moisture in the box will cause lower compression strength of the box. Lower compression causes collapse of stacked boxes and thus damage to the goods packed inside.

So control of moisture in corrugated box means controlling moisture in paper and in gum adhesives used in box making.

1.Controlled moisture in paper.

The major component of paper, cellulose fiber, is hygroscopic in nature and therefore tends to absorb moisture from a damp or humid atmosphere or release moisture in dry atmosphere. When paper gains moisture corrugated box loses its bursting strength (BS) and compression strength (CS) and when it loses moisture corrugated box develops the cracking or board breaking problem.

To avoid this cracking of corrugated sheets use of sprayer to spray water onto base paper, changing of machine speed and adjustment of the flexible paper-lead roller to cut preheat area are required. Avoid exposure of paper reels in open sun heat which will bring down paper moisture substantially to cause cracking of corrugated sheets at the end.

To overcome excess moisture in corrugated board use of correct paper cob, changing machine speed, use of preheaters etc. are some of the solutions.

2. Moisture control through gum adhesives

Gum adhesives play major role in avoiding excess moisture in corrugated box. Type and quality of starch used in adhesives, type of fillers used, modifications to starch and chemicals used in the gum adhesives are major players in causing excess moisture in corrugated board.

a) Gel temperature of gum is important in automated plants and in single face. High pin adhesion at low temperature gives complete dry liners and board. If gum fails to get gelatinized immediately when it reaches heaters at the set speed of machine, it fails to develop stronger bond adhesion and develops the tendency of gaining moisture from atmosphere in later stage even after complete drying.

b) Type of starch used and specific modification to starch to develop moisture resistance are very important factors. Usually hydrolysis of starch with the use of acid and then use of strong alkali to get viscous gum is a common product which is available in the market. These type of adhesives are bound to gain moisture in damp atmosphere and humid climatic conditions. Special modification treatment to high quality starch to develop moisture resistance is required.

c) Different fillers are used in gum adhesive making to bring down cost and make our adhesives cheaper in the market of competition. Very low cost fillers such as different flours, clay, Urea etc. are used which pay no role in gum quality than reducing price substantially. Flour, clay or urea are more of hygroscopic in nature and cause more and more moisture gain whenever gets opportunity.

d) Chemicals used in gum adhesives such as Sodium Hydroxide (caustic soda) is highly hygroscopic and not only absorbs moisture but carbon dioxide, sulfur dioxide in the air. It is also highly deliquescent and absorbs moisture to form an aqueous solution. More moisture means lesser bursting and compression strength which results in collapse of stacked boxes.

Grodex Moisture Resistant Powder adhesives are made of finest quality of different types of starch. A unique modification process with the state of art technology develops complete moisture resistance in adhesives. These products are not only Sodium Hydroxide (caustic soda) free but no other chemical is used in it make it eco and worker friendly. These are proved adhesives for moisture resistance all over the world over past several years for guaranteed moisture resistance and control in corrugated paper board industry. Use of these adhesives will solve not only your moisture problems but will provide you totally new thinking line of grabbing huge hidden profits from your box in a very competitive market.

Powder Adhesives For Corrugated Paper Boards