glue valves

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Corrugated paperboard for dummies

Corrugated packaging boxes are some of the most commonly used forms of transport packaging in the world today. The raw material used for this form of packaging is corrugated paperboard (or simply 'board'), and it is produced in many ways and with many specifications in order to fit the corrugated packaging and corrugated transport material requirements for a particular product and its supply chain, starting from a factory to the doorstep of a consumer. In the US alone, 95% of all consumer products are shipped in corrugated boxes, with 75% of this amount of box material being recycled each year. The basic principle is to use combinations of paper and adhesives with varying levels of heat and pressure; which allows for a variety of types to be produced, with varying levels of strength, weight and durability.

Corrugated paperboard starts out with basic liner (also called paperboard; from which the name comes) in massive rolls. The wavy paper shown below, sandwiched between the straight papers is called the corrugating medium (while the straight paper on both sides of the wavy one are the liners).

Common Corrugated Paperboard types and uses

Single-face Corrugated Board: A single liner is glued to a corrugated medium to form a single-face paperboard. This is commonly seen in packaging for fine china, light bulb etc.

Single-Wall Corrugated Board: Two liners are glued to either side of the corrugating material to form a single-wall paperboard. This is the simplest and most widely used form of packaging for shipments for a variety of plastic goods and food products. This is the box consumers come across most often In daily life.

Double-Wall Corrugated Board: When another layer of corrugating material and a layer of liner is added to a single-wall paperboard, the resulting product is the much stronger and shock absorbent double-wall paperboard. This form is heavier and more expensive and is generally used to ship/ transport bulk packaged foods, material like nails and rivets, appliances like TV's and DVD players and even furniture. For larger and heavier goods, Triple-Wall Corrugated Paperboard is produced in the same way.

Production

Corrugated paperboard is specifically designed to fit product based requirements. Producers usually specifically design the kind of paperboard to be used for each specific product type in accordance with transportation requirements, weight and strength and shock absorbent properties. The production of corrugated paperboard is simply explained as follows;

1- The first sheet of straight liner is unrolled and heated.
2- This sheet is then passed through high pressure steam to make it soft and spongy.
3- The sheet is then passed between a set of long sprockets in order to create the ridges (or flutes). This process forms the wavy 'corrugating medium'.
4- The glue is then applied to one side (in case of single-face paperboard) or either side (in single-wall paperboard) of the corrugating medium.
5- Sheets of liner are then unrolled and glued to one or either side of the corrugating medium to form a single-face or single-wall paperboard.
6- Further layers of corrugating medium and liner are added to form double-wall and higher classifications of corrugated paperboard.

About the Author

Dave Marinac - ABC Packaging Direct

ABC Packaging Direct works with you to understand your packaging needs and develop specialty packaging solutions including food packaging, thermoformed plastic trays, stand up pouches, low melt bags, autoclave bags, plastic valve bags and VCI bags.

1973 Johnson motor question.Low compression on one cylinder?

I have a 1973 johnson 50hp on the top cylinder I have 120 pounds and the bottom I have 90 pounds.What is the most common reason for this? I noticed in between the cylinders on the outside of the head there is a rust stain on it where the head bolts to the block. and on the front of the head there is another cover I think it covers where the water runs through the engine on the bottom of this plate there is a spring and some kind of valve well all around the spring there is some kind of red glue or apoxy that has the spring all the way covered is this suppose to be there. If you can help please do so and thank you in advance
I pulled the head off and the pistons seem to have the same play in them. The sealant is on the spring on the bottom of the cover and i never had it running just turning it over to check it out. I bought it off a friend and it came on the boat. What is the name of the cover that is on the head

everything the 80' s kid said was correct. When the engine is running do you feel any leaks around the side of the head. Your correct too, the top cover is for the water circulation. The red epoxy with the spring on the top cover on the top of your engine is the thermostat housing, you should have a thermostat in there too. the epoxy is probably because they do not have a gasket- which i doubt because they are so cheap, more than likely there is a nick or uneven surface, and they put the epoxy to stop the water form leaking. You could try removing the head and checking the condition and replacing the gasket and retorxing all the bolts, and check the compression again if this doesn't work you will need to rebuild the engine..good luck

Installing Irrigation Valve Drains

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