# How is tonnage calculated?

## How is tonnage calculated?

Tonnage for forming operations were dependent on the size of the form, material thickness and material tensile strength….

Equation 1 estimate Tonnage = 1 * 0.06 * 80 = 4.8 tons
Equation 2 minimum Tonnage = 3.14 * 0.06(20%) * 0.6(40) = 0.9 tons
Equation 2 maximum Tonnage = 3.14 * 0.06(50%) * 0.6(55) = 3.1 tons

### How do you calculate tonnage for injection molding?

What is the formula to calculate tonnage? To properly calculate necessary clamp tonnage, you must first know the projected area of the molded part/s plus any runners. Area can be calculated by multiplying length times width, A = L x W or A=πr2.

#### How do you calculate Mould size for a plastic component?

The first step in determining appropriate clamp tonnage is to calculate the surface area of the part. This simply means getting the square inch area of the cavity by multiplying the length by the width. If it is a multi-cavity mold, multiply the number by the number of cavities.

What is ton in plastic injection Moulding machine?

The “tonnage” is the measure of force that is required to keep the tool closed during the injection process. This force is the main factor in determining the injection molding machine size required for producing the part.

What is tonnage measurement?

‘Tonnage’ broadly is a measure of a ship’s size which can be expressed in terms of either volume or weight. The word ‘ton’ originates from the French ‘tonneau’, or English ‘tun’, which in the 13th century was a large wine cask of volume about 252 gallons, i.e. about 40 cubic feet, and weight about 2240 lbs.

## What do you mean by tonnage?

Tonnage is a measure of the cargo-carrying capacity of a ship, and is commonly used to assess fees on commercial shipping. The term derives from the taxation paid on tuns or casks of wine. In modern maritime usage, “tonnage” specifically refers to a calculation of the volume or cargo volume of a ship.

### What is tonnage factor?

The tonnage factor provides the mechanism for the conversion from volume of ore to weight of ore. In the English system, the tonnage factor is normally expressed as cubic feet per ton of ore. In the metric system, the tonnage factor is the specific gravity of the ore.

#### How do you calculate plastic tonnage?

T = A x cf. For example, the projected area of the molded part is 150 sq/in times a clamp factor of 3 (tonnage needed/square inch from material data sheet). 150 x 3 = 450 tons needed. If you are running in a 500-ton press, try starting at 450 tons.

What is clamp factor?

Clamping force is an important factor in the injection molding process. It is basically a safety measure implemented to operate the injection molding setup. A close mold is used to achieve the desired results. This mold is clamped in place during the operation using a clamping unit.

What is machine tonnage?

Simply put, tonnage is the amount of force needed to keep the tool closed during the injection process. This clamping force is measured in tons and is vital to know in order to select an appropriate injection molding machine. A small machine may only be 25 tons, and they range up to 4,000 tons and beyond.

## What is GRT and DWT?

Gross tonnage is a volumetric measurement of the enclosed space in a ship. It has NOTHING to do with weight. The unit used is the gross TON. Deadweight tonnage is the WEIGHT in metric TONNES (1,000 kg) of cargo, fuel and stores that will put the ship down to its loadline marks.

### What is the difference between GRT and GT?

Under this equivalency clause, 200 GRT is equal to 500 GT and 1600 GRT is equal to 3000 GT. This also applies to vessel’s measured under our GRT (Regulatory) system and when STCW applies. This is because the vessel falls under the category of vessels of 500 GT or more, under the STCW code.

#### What is tonnage in injection molding?

The “tonnage” is the maximum of clamping force that a injection molding machine can offer to keep the the injection tool tightly closed during the injection process.

What are the factors that affect the quality of plastic parts?

It must also have pressure in abundance and a flow rate high enough to allow for proper part filling. Plastic variables also must be considered, focusing on how important it is to process from “the plastic’s point of view.”

How much clamp tonnage do you need for molding?

A good starting point would be 420 tons of clamp force. Now that we have focused on how to determine appropriate clamp tonnage, let’s take a look at the effects of applying excessive tonnage. Here are some typical molding defects that can be seen on parts almost immediately when tonnage is too high:

## How do you calculate tonnage for clamping force?

What is the formula to calculate tonnage? Empirical Formula 1 Clamping force (T) = Clamping Force Constant Kp * Product Projected Area S (CM * CM) * Safety Factor(1+10%) To properly calculate necessary clamp tonnage, you must first know the projected area of the molded part/s plus any runners.