Blow Molding Quality Control: Factors To Observe In Quality Engineering

blow molding equipmentIt’s well understood that quality control is a crucial factor for all manufacturing and engineering practices throughout industry. Without quality control, all aspects of product planning and launch can result in failure. What follows are some of the key issues that must be considered for quality control in a blow molding project.

Blow molding refers to the manufacturing process that’s used to produce plastic containers and similar products. This generally includes hollow containers such as pop, juice, and water bottles, as well as liquid soap and shampoo bottles. But the full range of blow molded products is remarkably diverse – everything from vitamin and medicine containers to special custom-designed forms can be made using blow molding – and the method is used throughout industry on an international scale.

Given the scope of blow molding, any company that’s planning to create containers for their products needs to be fully focused on quality. What follows are the basic critical factors that must be considered. These points should be discussed with plastics engineers when considering the most suitable manufacturing methods:

The four main blow molding quality control factors that need to be addressed for quality assurance are:

  1. A careful determination of product requirements in the planning phase;
  2. An adherence to all product specifications during manufacturing;
  3. An assurance of the manufacturing production standards;
  4. A quality assurance program to ensure product quality after manufacturing and before going to market

Within these core areas are the following points that must be keenly observed. The first set of points concern product considerations, as follows:

  • The type of plastic that will be used for the product;
  • The required strength and flexibility for the plastic form (container);
  • The product design and dimensions (including wall strength and thickness);
  • The products ability to withstand hot and cold temperatures, and to what degree;
  • That the risk of leaking seals and pinhole leaks are negligible;
  • That all product requirements for durability (such as for shipping and storage) are met;
  • That all attributes of the total product/container design meet the stringent demands of the marketplace;

The blow molding production process will need to be fool-proof in the following areas:

  • That the plastic injection process is constantly reliable;
  • That the velocity and pressure of the blown air is consistent for reliable product production;
  • That the speed and reliability of the mold closing is reliable;
  • That the manufacturing temperature is within process parameters; this includes an assurance that the cooling time is correct for the process;
  • That all other product dimensions and criteria are constantly met during production;
  • That the total production process flows in a continual, reliable manner

As can be concluded, it quickly becomes evident about the need to consult with an expert firm that specializes in blow molding and other production methods. There is much to be gained with proper advance planning and in understanding the various process parameters for product development and manufacture. An adherence to best planning practices, involving expert consultation, will certainly be the right approach to blow-molding quality control and quality assurance!

Pet All Manufacturing Inc. is a global leader in blow molding and injection blow molding manufacturing processes. The company sells a full range of blow molding equipment and injection blow molding machinery. Pet All Manufacturing can fulfill all client requirements and welcomes client inquiries to ensure the best manufacturing solutions are met. Contact the Canadian branch of Pet All Manufacturing by calling 905-305-1797 or by email at

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