Gluing pocket spring units: How to quickly adjust to different formats

09. October 2024 3 min.

Florentin Cioranu, Industry Manager Woodworking, Mattress, Building Supplies

Who doesn’t love them: high, comfortable mattresses with good support making it easier to get in bed at night and out in the morning? The trend toward ever higher mattresses requires mattress manufacturers to be able to quickly and flexibly adjust their adhesive application system to different pocket spring formats. In this blog post, we will show you two examples of how easy this can be accomplished.

Adjusting the adhesive application to pocket spring cores of different heights is quick and easy with Robatech systems.

To produce a pocket spring core, springs are individually packed in fabric pockets that are joined together. The resulting pocket spring unit is cut and then glued together with other units to form a mattress core. This can be achieved by an intermittent lateral adhesive application, a cover layer gluing or a combination of both. The type of hot melt adhesive application affects the point elasticity of the pocket spring core and thus significantly influences the mattress quality.

Lateral and cover layer gluing to produce the pocket spring core.

Flexible adhesive application for different pocket spring formats

An adhesive application system for hot melt gluing of pocket springs generally consists of an adhesive melter, a heated hose and one or two application heads. To enable you as a manufacturer to process different pocket spring heights, you need an application head with several jetting elements and application nozzles. Flexibility in adhesive application is achieved primarily thanks to two features:

Firstly. Individual control of jetting elements. This allows you to switch individual application nozzles on or off, for example, if you only need cover layer gluing. The individual control also allows the application type to be selected: adhesive-saving, intermittent bead application for lateral pocket spring gluing and/or continuous bead application for cover layer gluing.

AX Diamond application head with four individually controllable jetting elements Adhesive application for pocket spring and cover layer gluing with one application head

Secondly. Angled nozzles. This type of application nozzle allows you to adjust the application angle to the respective pocket spring format. A wrench is all that is needed.

The angle of the hot melt adhesive application can be easily changed with a wrench if angled nozzles are used.

Tip: Select the application angle so that the adhesive is applied to the points where the spring touches the pocket. Thus you ensure that the correct contact pressure is achieved for a reliable bonding.

Correct adhesive application to a pocket spring unit Adhesive application to the right points, increases bonding reliability.

Trendy high pocket spring cores? No problem.

You are even more flexible with two application heads. This configuration is particularly beneficial if you are a mattress manufacturer gluing pocket spring units of different heights. The distance between the two application heads can be varied quickly and easily. This opens up more freedom for format adjustments.

Flexible alignment of two SX Diamond application heads for adhesive application to pocket springs Flexible adjustment to pocket springs of different heights with two application heads.

Ideally prepared for pocket spring core assembly

With a hot melt system that enables individual control of the application nozzles, easy adjustment of the adhesive application angles and flexible height adjustment, you are ideally prepared for all trends in pocket spring core assembly. The selection of the right application head and the number of jetting elements required depends on your machine speed and your pocket spring formats. With our AX Diamond, SX Diamond and SX 1S Diamond LongLife jetting heads, Robatech provides everything you need when it comes to pocket spring mounting.
Would you like to find out more? Write to us. We will be happy to advise you.

Florentin Cioranu, Industry Manager Woodworking, Mattress, Building Supplies

Florentin Cioranu closely monitors trends in the furniture and bedding industry as well as the interior design sector. In-depth communication with customers and his decades of experience with production processes feed into the development of new, solution-oriented adhesive application systems.