Author: espira_

This blog on the plastic transformation sector is intended to become a portal of verified information and useful for our customers. In Colortec we are engaged in writing several posts, as a way of transmitting our specialised knowledge and experience in this business. After working closely for more than 25 years with companies from different sectors and sizes, we have gathered the main questions and common patterns when manufacturing our customers’ pieces, ensuring the requested confidentiality by our customers. We believe this may be of great help for other manufacturers and may serve as a guide in design processes and the fix of physical defects of certain pieces.

Since our first post, we are going to deal with one of the most frequent physical defects in thermoplastic injection pieces: splay marks. There are many types of splay marks with many possible causes. In this post we will write about splay marks due to burnings.

What are splay marks due to burnings?

They are caused due to the thermic degradation of plastic or colour concentrate. They appear in form of chalky or brown splay marks over the Surface of the injected piece.

What are their main causes?

• 1st Cause: Excessively high temperature in the injection machine.
• 2nd Cause: Too much time inside the injection cylinder.
• 3rd Cause: Low thermic resistance pigments or colorants.
• 4th Cause: Spindle working at a very high speed.

Solutions:

Solution to Cause 1: Lower the temperature of the machine’s cylinder, so the temperature of the plastic mass is also lowered. Reduce the injection pressure. It is important to take into consideration if the natural material has been subjected to a drying process before its processing, since prolonged exposures mat degrade the material in advance.

Solution to Cause 2: Shortening the times in the cycle may prevent the material to exceed the recommended time spent inside the machine.

Solution to Cause 3: Apply masterbatch designed with colorants, pigments or additives with better thermic resistance that may be apt for the material’s temperature processing.

Solution to Cause 4: Reduce the spinning speed of the spindle.

Colortec Química attempts to offer optimum communications with customers, partners and suppliers by promoting knowledge and technology.

With the design and development of their new website colortec.es, the company philosophy is clearly based on innovation, research and technology. It is also reflected by their ongoing commitment to be close to the customer’s needs and the innovation required by the market.

With this new website, Colortec is looking forward to providing a response to the demand of a sector that aims at interacting with companies, having a good, effective and customised flow of services, and also opting to work with the products that our customers’ projects require. Besides, this online platform aims to show our customers why Colortec offer the most suitable products for their needs, as well as the constant evolution of the manufacturing process and the company’s service standards. This effort to develop our activity may be reflected in several quality certifications, the exponential growth of our R+D+I laboratories and the diversification of our activity, being present in different sectors, such as the automotive, food, footwear or construction, among others.

Colortec.es will continue to provide a customised service and will serve each of our customers with the sole purpose of providing the best products and services in our business.

Please contact us at info@colortec.es for any information that you may need.