Engineering College

1) What two measures are used in rating the size of an injection molding machine?

2) What is packing the mold and why is it important in obtaining good injection molded parts?

3) How does high crystallinity in a resin affect the way the resin is injection molded, including any post-molding operations that might be done?

4) Why is it important to have the sections of the molded part as uniform in thickness as possible?

5) Assume that you are assigned to determine the minimum clamping force for a part to be molded out of polystyrene. The part cross-sectional area is 10 x 14 inches. What is the clamping force required if as a general rule, 2.5 tons of force are needed for each square inch of cross-sectional area?

6) Why is low specific heat capacity desired in a mold cavity material for some applications and a high specific heat capacity desired in others?

7) What feature in a mold will allow a hollow, cylindrical part to be made? Why are injection molding machines not as effective for mixing additives or other resins as are traditional extrusion machines?

8) What is a vent in the mold, what problems are prevented by the presence of a vent, and what parameters control its size?

Answers

Answer 1

1) The two measures used in rating the size of an injection molding machine are the clamping force and the shot capacity. The clamping force refers to the force exerted by the machine to keep the mold closed during the injection process.

2) Packing the mold involves applying additional pressure to the resin after the injection phase. This is done to ensure that the mold cavity is completely filled and that the plastic material is properly packed within the mold. Good packing is important because it helps to eliminate voids, reduce shrinkage, and improve the overall strength and quality of the injection molded parts.

3) High crystallinity in a resin affects the injection molding process and post-molding operations. Resins with high crystallinity tend to have slower melt flow rates, requiring higher processing temperatures and longer cooling times.

4) It is important to have uniform thickness in the sections of a molded part to ensure consistent cooling and minimize the risk of defects.
5) To determine the clamping force required, we multiply the part cross-sectional area (10 x 14 inches) by the general rule of 2.5 tons of force per square inch.

6) Low specific heat capacity is desired in a mold cavity material for some applications because it allows for faster cooling and shorter cycle times.

7) A feature in a mold that allows a hollow, cylindrical part to be made is called a core. The core creates the internal cavity of the part while the mold cavity forms the external shape.

8) A vent in the mold is a narrow gap or channel that allows for the escape of air, gases, or excess material during the injection molding process. It helps to prevent issues such as air trapping, burn marks, and incomplete filling of the mold cavity.

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Related Questions

a voltage amplifier with an input resistance of 40 kn, an output resistance of i 00 n, and a gain of 300 v n is connected between a 10-kn source with an open-circuit voltage of to m v and a i 00-n load. for this situation:

Answers

The current flowing through the circuit is approximately 0.4 μA.

To analyze the situation, we can use the voltage divider rule and the concept of load and source resistance to determine the voltage across the load and the current flowing through the circuit.

Given data:

Input resistance (Rin) = 40 kΩ

Output resistance (Rout) = 100 Ω

Gain (Av) = 300 V/V

Source resistance (Rsource) = 10 kΩ

Open-circuit voltage (Voc) = 20 mV

Load resistance (Rload) = 100 Ω

To calculate the voltage across the load (Vload), we can use the voltage divider rule:

Vload = Voc * (Rload / (Rsource + Rin + Rload))

Substituting the given values:

Vload = 20 mV * (100 Ω / (10 kΩ + 40 kΩ + 100 Ω))

Vload = 20 mV * (100 Ω / 50.1 kΩ)

Vload ≈ 0.04 mV

The voltage across the load is approximately 0.04 mV.

To calculate the current flowing through the circuit, we can use Ohm's Law:

I = Vload / Rload

Substituting the values:

I = 0.04 mV / 100 Ω

I = 0.4 μA

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2. in this unit of inquiry you have been learning about force and motion. what specific areas of focus within this unit do you need to consider when designing your supplypod?

Answers

When designing your Supply Pod for the unit of inquiry on force and motion, there are several specific areas of focus that you need to consider.

1. Forces: Understand different types of forces, such as gravity, friction, and magnetism. Consider how these forces can be utilized or minimized in your SupplyPod design.

2. Motion: Explore the concept of motion, including speed, acceleration, and velocity. Think about how you can incorporate elements that demonstrate or utilize these principles in your SupplyPod.

3. Energy: Investigate various forms of energy, such as potential and kinetic energy. Consider how you can incorporate energy transfer or conservation principles into your SupplyPod design.

4. Simple Machines: Learn about simple machines like levers, pulleys, and inclined planes. Think about how you can incorporate these mechanisms into your Supply Pod to enhance its functionality or efficiency.

5. Design and Engineering: Apply the principles of design thinking and engineering to your SupplyPod. Consider factors like stability, durability, and ease of use when designing your pod.

By considering these specific areas of focus, you can ensure that your Supply Pod aligns with the concepts and principles learned in the unit of inquiry on force and motion.

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