Q1: What Is a Glue-Free Pocket Spring Unit?

A Glue-Free Pocket Spring Unit is an eco-friendly, non-glue mattress core material. It is assembled by ultrasonic welding instead of hot-melt adhesive and serves as the elastic support structure for mattresses and other compatible upholstered products.

Q2: Which Is Stronger: Ultrasonic Welding or Hot-Melt Adhesive Bonding for a Glueless Pocket Spring Unit?

Ultrasonic non-woven fabric welding technology has become highly mature, and its welding strength is even stronger than hot-melt adhesive thermal welding.

Q3: Is a Non-Glue Pocket Spring Unit Completely Free of Glue? How Is It Used to Make Eco-Friendly Glue-Free Mattresses?

Yes, no glue is used at all. Adjacent pocket springs form a four-leaf clover structure, which is Lianrou's patented technology. For making eco-friendly glue-free mattresses, we offer two process recommendations:

· Use edge framing and add industrial springs at the edge of the spring unit to secure comfort layer materials such as foam, sponge, and felt to the spring unit. This also enhances the edge support stability of the Non-Glue Pocket Spring Unit and prevents the mattress core from sagging.

· Use Lianrou Technology's ultrasonic welding fabric technology to secure the glue-free four-leaf clover pocket spring unit. After adding comfort layer materials, a completely glue-free mattress or fully disassemblable mattress can be produced through physical fasteners and other methods.

Q4: What Are the Features of the Four-Leaf Clover Glue-Free Pocket Spring Structure?

Every four adjacent pocket springs form a four-leaf clover structure. The springs share pressure evenly and transfer pressure to one another. It has strong tear resistance, maintains the independent response of each spring, and improves the stability of the spring unit structure.

Q5: Can a Glueless Pocket Spring Unit Reduce Formaldehyde or VOC Risks? Will a Mattress Made with It Be Free from Formaldehyde Pollution?

Although most mattress manufacturers currently use eco-friendly hot-melt adhesives, it is impossible to confirm whether hot-melt adhesive manufacturers release formaldehyde and VOCs during production or when consumers use the final product. To help mattress manufacturers eliminate consumer concerns and produce a mattress core material that avoids hot-melt adhesives in response to market demand, this is the original intention behind Lianrou's development of the fully ultrasonic welding production line for Glue-Free Pocket Spring Units and its provision of custom glue-free pocket spring core services. The Glue-Free Pocket Spring Unit abandons the traditional hot-melt adhesive assembly method for pocket springs and truly reduces the use of hot-melt adhesive.

For consumers, whether a mattress made with a Glue-Free Pocket Spring Unit poses formaldehyde and VOC pollution risks still needs to be comprehensively evaluated based on whether glue is used in the non-woven fabric, other comfort layers, fabric layer, edge binding, and other processes. The actual test report should be taken as the standard.

Q6: What Types of Mattresses and Furniture Can Be Produced with a Glue-Free Pocket Spring Unit?

Lianrou's Glue-Free Pocket Spring Units fall into two major categories. One is designed specifically for mattresses, using standard 12 cm to 35 cm straight-barrel or barrel-shaped pocket springs for mattresses, and any custom height is also supported. The other is a "low-profile" micro spring designed specifically for pillow inserts, thin tatami mattresses, sofa seat cushions, throw cushions, car seat cushions, and dining chair cushions, with heights available from 4 cm to 10 cm.

Q7: Can a Glue-Free Pocket Spring Unit Be Customized? What Information Does Lianrou Technology Need When Purchasing a Glue-Free Pocket Spring Unit?

Yes. Lianrou can provide personalized customization according to the supplier's actual production capacity. Buyers need to provide wire diameter, number of coils, spring diameter, pocket spring height, fabric thickness, spring unit dimensions, support requirements, and purchase quantity. Lianrou will confirm the product solution and quotation within 1–2 days.

Q8: How Do You Judge the Quality of a Glue-Free Pocket Spring Unit?

Lianrou Technology is strict about quality control. It is recommended to comprehensively check whether the spring heights are consistent, the strength of the welded areas (whether there is cracking, loosening, or detachment), repeated compression performance, material quality, and batch production consistency. For large-volume buyers, sample testing or small-batch purchasing can be conducted first.

Q9: How Are Lianrou Technology's Glue-Free Pocket Spring Units Packed? What Is the Delivery Lead Time?

Lianrou Technology provides corresponding packing methods according to the type of Glue-Free Pocket Spring Unit ordered by the buyer. For example, Glue-Free Pocket Spring Units (unprocessed) and Glue-Free Pocket Spring Units with ultrasonically welded fabric can be rolled and compressed for packaging, while Glue-Free Pocket Spring Units with edge framing are packed in kraft paper (without compression).