Adhesives, which facilitate the attachment of two surfaces or substances, are used in the manufacturing of cartons/boxes, paper bags, paper sacks, paper tubes, wallpapers, etc. There are 3 general classes of adhesives which are used in the corrugation industry:
Water based adhesives : The most prevalent type of adhesive is the one that is water based.

• Starch based powder adhesives : Starch based powder adhesive refers to the adhesive derived from starch. It has gained a lot of popularity due to the lack of toxicity, economical cost and the strength that it offers.
• Caseins : Casein is derived from precipitated cow's milk. It is also used in some industries. Other infrequently used natural adhesives include animal proteins and animal glues, the latter derived from collagen extracted from animal tissues. Once quite popular, these animal-based adhesives, today, are used only in certain specialty applications, as the advancement in starch based and synthetic adhesives far surpasses their performance characteristics.
• Synthetic water-based adhesives : Synthetic adhesive refers to the adhesive that is derived from resin-based emulsions such as a uspension of polyvinyl acetate in water. Synthetic water-based adhesive is also used in the packaging industry.

Hot-melt adhesives : Hot Melt adhesive refers to the adhesive that is based on thermoplastic polymers such as the copolymers of ethylene and vinyl acetate, which melts when heated, and is applied in the molten state, and forms a bond when cooled.

Starch based adhesive is very cost effective as against synthetic adhesives and other natural adhesives. Starch based adhesive is prepared from maize, tapioca, wheat, potato, cassava, etc. These crops are available in abundance. Also it is renewable in nature. Starch based adhesive has little or no odor. Starch based adhesive is biodegradable in nature.

The following parameters are very critical for ensuring consistent good quality output :
Viscosity : In corrugating industry, the term viscosity is used to describe adhesives flowability. Low Viscosity - When adhesive paste is too thin or has low viscosity, the water tends to wick into the medium. This wicking action may remove the needed water from the glue line, which means that the starch may not have enough water to completely gelatinize. Many times the board will be dry and brittle coming off the corrugators or may become brittle as it stack cures. If a pin adhesion test is performed on a sample of this board, low numbers will result. There may be very little fiber pull and the glue line will have an amber appearance. Since the bond is marginal, one solution is to open the glue setting s on the machine to deliver more adhesive to the glue line. The downside to applying more adhesive is the potential for warp, wash boarding, higher starch consumption and lower machine speeds. High Viscosity (Thick, Heavy Adhesive) - When the adhesive is too thick it tends to sit on top of the flute tip, penetrating the medium and glue line very slowly. This will lead to a soft, wet board coming from the corrugators. It is difficult print on the wet board and it is difficult to convert it in the finishing department. Starch consumption will also increase because of wide glue lines associated with thick adhesive. This results in gelling problems. Poor transfer of adhesive is resulted due to high viscosity. On some of the high speed plants of the modern era, the machine will stop if viscosity is too high.

Gelatinization : Gelatinization temperature or the gel temperature is the temperature at which the adhesive begins to thicken and develop its bonding properties. Gel temperature can be measured by simply heating adhesive with a glass thermometer. When the paste begins to thicken, the temperature occurring on the thermometer is recorded. Gel Temperature Too High - If the gel temperature is too high, there may no t be enough heat present to gelatinize the starch. This will result in white glue line and poor bonding. The speed of the corrugators may be reduced to achieve an acceptable bonding, particularly on double wall board. The dry end operators may notice wet or soft board coming off the machine. b. Gel Temperature too low - If the gel temperature is too low, the adhesive will gel before penetrating into the paper, which may result in brittle board and dry bond. There may also be severe gelling on the figures of the single facer or gelling in the pans.

The products of Sanjay Adhesives are characterized with the following features :
Starch based powder adhesive offers several advantages to its users. These are enumerated below :
Ready to use Adhesive : The adhesive which will be offered is a ready to use product which requires mere stirring for 30 - 45 mins in a high speed stirrer.
Dries instantly : Irrespective of the climatic conditions, the adhesive offered by Sanjay Adhesives will dry out instantly.
Non - Hygroscopic : Kraft paper used in manufacturing is hygroscopic in nature. Alkaline adhesive with ph15 is also hygroscopic in nature which affects the quality of output. However products offered by Sanjay Adhesives are non hygroscopic in nature. So once the board once dries, it will resist absorbtion of atmospheric moisture. (Based on the readings of the existing customer's output, moisture level on boards made by automatic plants is approx. 5% and semi - automatic plants is 7-9%.)
Increased Caliper of the board : The adhesive creates a coating on the sheet on which it is applied which increases the caliper of the board.
Increase in Bursting Strength (B.S), Compression Strength (C.S), R.C.T and Weight of the board : The adhesive which is offered has positively shown an increase in the B.S and C.Sby approx. 10 - 15% (based on the readings of existing customer's output). It has also shown marginal increase in the RCT and Weight.

Quality is a qualitative term which can be quantified only when the actual results are measured in terms of the BS, CS, caliper, weight, no of defective output. Hence to get a clear idea about the final output you can place a trial order.

You can place a trial order by filling this simple form.

We have wide range of products for different types of machine and papers. However, if they do not meet your requirements, we can tailor the products to meet your specific requirements.

Sanjay Adhesives has been into this industry for over 6 decades. It not only has immense knowledge about the starch based adhesives and its application but constantly has indulged in innovating the formulation of the product so that the output of its customers is of excellent quality.