How to use hot melt adhesive particles to bond the paper tote bag rope? Complete tutorial from selecting glue to applying glue

Direct answer: For paper bag rope adhesion, hot melt adhesive particles with high initial adhesion, good flexibility, and a softening point of 75-85 ℃ should be used. The diameter of the adhesive point should be 8-12mm, with one point at each rope hole. Press and hold for 3-5 seconds.The key is not in the amount of glue, but in the accurate positioning and proper pressing of the glue points.

Step 1: Determine which type of bag your bag belongs to

• Knotted rope typeAfter the rope is punctured and knotted, the glue only serves to fix and prevent loosening, with minimal usage.
• Rope head adhesive typeThe rope head is directly pressed onto the inside of the bag opening or reinforced paper, and the adhesive can bear all the weight, with the highest requirement.
• Paper rope compression typeThe flat paper rope is fully attached to the bag mouth, with a large contact surface, requiring a thin and even adhesive layer.

The latter two types have significantly higher requirements for the peel strength and flexibility of the adhesive, and should not be mixed with the sealing adhesive when selecting the adhesive.

Step 2: Select adhesive parameters for comparison

Step 3: Equipment and Temperature Settings

Handheld glue guns or small dispensing machines are generally used for manual production lines, with a melt adhesive temperature set at 170-180 ℃. After starting up, do not rush to apply glue. First, empty 3-5 shots to drain the residual glue in the pipeline, to avoid black residue or insufficient glue in the first batch of products. The semi-automatic line uses a dispensing valve, set the dispensing time to 0.15-0.3 seconds, and first try to apply the glue on the waste paper to confirm the size of the glue point.

Step 4: Key points of gluing operation

• PositionThe adhesive point should be placed in the central area between the reinforced paper and the bag body, at least 5mm away from the edge, to prevent overflow of adhesive hands.
• quantityEach rope lifting hole only needs one adhesive point, double points can easily cause uneven compression.
• laminationWithin 3 seconds after gluing, complete the bonding process. Use your fingers or a pressing tool to hold for 3-5 seconds until the edge of the glue point no longer deforms.
• coolingBefore stacking the finished products, let them stand for at least 30 seconds. Hot stacking will flatten and render the adhesive points ineffective.

Step 5: Acceptance testing

Select 10 pieces from each batch and conduct two tests: one is static load test, where a 5kg weight is placed in the bag and lifted for 60 seconds without detachment; The second is the peeling test, which involves manually tearing the rope at the fixed point. The qualified standard is that the paper is torn but the adhesive dots do not fall off as a whole. If the adhesive dots are cleanly peeled off from the paper, it indicates insufficient initial adhesion or penetration, and the temperature needs to be increased or the model needs to be replaced.

Frequently Asked Questions

Q: Can we use sealing rubber particles instead?
Answer: Not recommended. The sealing adhesive is too hard and prone to cracking when bent after curing, resulting in a short lifespan when used at the rope lifting position.

Q: What should I do if the adhesive dots turn yellow or have black residue?
Answer: It is mostly due to the long-term high-temperature storage and carbonization of the glue in the glue pot. Reduce standby temperature, clean the pot in a timely manner, and avoid mixing different brands of granules.

Q: What is the reason why ropes tend to break during winter lifting?
Answer: The adhesive layer becomes brittle at low temperatures. Need to replace the cold resistant formula or choose a model with slightly lower softening point and better flexibility.

Sunlife hot melt adhesive provides multiple flexible models for paper bags, color boxes, graphic printing and other scenarios. Guangzhou Sunlife Trading can recommend specific grades and provide samples according to bag types and load-bearing requirements.