How to fix the pulp molding inner tray with hot melt adhesive particles? Three step dispensing without overflowing glue

Pulp molded inner trays (egg trays, electrical liners) often require corrugated outer boxes or positioning cardsDotting and fixingIt has a rough surface and absorbs water, making it easy to overflow and crack if the wrong glue is used. Here is a set of three steps that can be copied directly.

Step 1: Choose the right adhesive particles

pulp moldingAfraid of high temperature and too deep penetration. ChooseLow temperature (75-85 ℃), medium viscosity, fast curingThe EVA hot melt adhesive particles and Sunlife hot melt adhesive have specialized molded inner tray models with an opening time of 6-10 seconds, leaving room for manual alignment. Avoid using high flow book glue, as it may seep into the pores of the pulp and cause virtual sticking.

Step 2: Control the gluing and pressing process

• Glue amountEach fixed point weighs 0.4-0.6g, use a quantitative dispensing valve, do not rely on hand pressure.
• PositionThe force is only stable when it is hit on the “solid edge” of the molded inner support instead of the thin-walled depression.
• laminationAlign and compress within 2-3 seconds after dispensing, hold for 5 seconds, and complete within the opening time.

Step 3: Acceptance and glue overflow removal

Common problem handling

If it appearsglue overflowReduce the temperature by 5 ℃ and decrease the opening of the rubber valve; If it appearsdoesn’t stick wellIf there is dust on the molding surface, blow it clean before applying glue, or switch to a higher initial adhesive model. Guangzhou Sunlife Trading can send samples for machine testing, and set parameters according to your molding weight.

Frequently Asked Questions

Q1: Can I use a hot melt glue gun to manually order?
Small batches are possible, but unstable temperatures can cause glue overflow. For mass production, it is recommended to use a quantitative dispensing valve.

Q2: Can the molded inner bracket stick to PET windows?
Ordinary EVA adhesive PET is weak and requires polyolefin or specialized low surface energy adhesive.