Seal strength data

A package engineer needs to ensure that the seals on plastic bags that hold a product are strong enough to prevent leaks, yet not so strong that the consumer cannot open the bags. The engineer wants to optimize the seal strength to between 24 and 28 lbs (lower and upper bounds) with a target of 26 lbs. The engineer also wants to minimize the variability of seal strength so that it is 1 or less. The engineer determines that hot bar temperature, dwell time, hot bar pressure, and material temperature are factors that contribute to the strength of the seal. The engineer also determines that hot bar temperature and dwell time are important factors for reducing the variation. The engineer designs a central composite response surface experiment to examine the factors that impact the strength and variability of the seal.

You can use this data to demonstrate Analyze Response Surface Design. You can use the data with the model to demonstrate response surface commands such as Predict, Factorial Plots, Contour Plot, Surface Plot, Overlaid Contour Plot, and Response Optimizer.


To view a summary of the design, choose Window > Project Manager then click the design in the folder for the worksheet.

Worksheet column Description
StdOrder The order of the runs in standard order (also called Yates order).
RunOrder The order of the runs in random order.
PtType The point type: 0 = center point, 1 = corner point, -1 = axial point.
Blocks The blocks. In this design, all the design points are contained in a single block.
HotBarT The hot bar temperature (continuous factor).
DwelTime The dwell time (continuous factor).
HotBarP The hot bar pressure (continuous factor).
MatTemp The material temperature (continuous factor).
Strength The strength of the seal in pounds (response).
VarStrength The variability in the strength of the seal (response).
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