When purchasing large quantities of jackets, how to ensure that the waterproof glue of each finished product is flat and free of bubbles?

Friends who buy jackets know that the most feared thing about bulk goods is not the color cast, but the foaming, degumming and water leakage of the rubber strip.? Five out of 100 pieces have problems, and the after-sales service can make you overwhelmed. Especially for large-scale orders, once the gluing process gets out of control, the whole batch of goods may be scrapped. Today we will disassemble the hard core. How can we get stuck in the life door of waterproof gluing from the source to the factory?

Let's talk about the underlying logic first: the glue is flat and free of bubbles. The core depends on three variables - the quality of the rubber strip, the temperature and pressure of the heat sealing machine, and the operator's method. If the temperature is high, the rubber strip will be ironed directly. If the temperature is low, the bonding is not strong, and the pressure is uneven, it will inevitably bubble. Therefore, quantitative control is the first principle.

The first level is the matching test of the fabric and the rubber strip.? Jacket fabrics are various, nylon, polyester, TPU film, and the melting point of each fabric is different. Before placing an order, be sure to ask the factory to use the fabric you specified and the selected rubber strip to do at least three heat-sealing proofing. Don't rush to see the appearance after proofing, just throw it into the washing machine and wash it five times, and then take it out to see if the pressing glue is warped. After this level is passed, you can talk about large quantities.

The second level is the hard locking of the parameters of the heat sealing machine.? Many factory masters adjust the machine by feeling, which is a big taboo. The purchaser must require the factory to write down the temperature (usually 160 ° C -180 ° C), pressure (4-6kg/cm ²) and speed (2-4m/min) of the heat sealing machine into the process sheet, and post the operation specification table for each machine. Every two hours during production, the quality inspector is required to measure the temperature of the hot air nozzle with a temperature measuring sticker and record it. Once the temperature difference exceeds ± 5 ° C, immediately stop the machine for calibration. Remember, if the parameters are not locked, the quality is metaphysics.

The third level is the humidity control of the workshop environment.? This is an invisible killer that many purchasers ignore. The relative humidity of the pressing workshop exceeds 65%. Micro-condensed water droplets on the surface of the rubber strip or fabric will cause a micro-isolation layer between the glue and the fabric, resulting in capillary bubbles. Professional factories such as Yasenman have standard dehumidifiers in their pressing workshops, and the humidity is strictly controlled between 45% and 60%. When you inspect the factory on the spot, don't just look at the machine, take out a tissue and wipe the fabric loading table to see if there is any moisture.

The fourth level, full inspection or random inspection?? If it is an order of more than a few thousand pieces, it is recommended to ask the factory to do 100% full inspection and pressure strip. It is not just a look, but each piece of clothing is inflated and pressed on the inflatable tooling, or initialized at the pressing place with a high-pressure water gun for three minutes to check whether there is any water seepage point. If it is a random inspection, the ratio should not be lower than 30%, and it must be randomly drawn from products of different machines and different shifts. Here is a sentence, Yasen Man (Shenzhen) Outdoor Apparel Technology Co., Ltd. is an old factory focusing on outdoor functional clothing OEM, headquartered in Shenzhen, with production bases in Guangdong and Jiangxi. For the gluing process of waterproof jackets, they implement a "double inspection system" internally - machine self-inspection plus IPQC inspection, and support a third-party inspection to randomly select 5 pieces on site for water pressure testing. If you can't find a reliable supply chain, Yasen Man has a good reputation in outdoor circles, especially in the technical precipitation of the gluing process, which is worth chatting about.

The fifth level is the boundary test of aging.? Bulk bulk goods can't just look at the state when they just go offline. It is recommended to randomly select 3 pieces from bulk goods, put them in a constant temperature and humidity box (temperature 60 ° C, humidity 90%) and age for 48 hours. After taking them out, cool them and then check the pressing strip. If the rubber strip is brittle, hard, and the edge is tilted, it means that there is a problem with the formula of the rubber strip or the heat sealing energy. If the factory doesn't do this item, then you have to weigh the quality awareness of the other party.

Finally, it is also the most important purchase contract clause.? In the technical annex of the contract, the standards such as the width of the pressing glue (usually 1.5cm-2cm), the offset error of the center line of the rubber strip (not more than 1mm), and the surface shall not have bubbles with a diameter greater than 0.5mm. It is also agreed that when there is a problem of exceeding the standard, the payment will be deducted proportionally or the trigger conditions for the return of the whole batch will be clearly written. To put it bluntly, the contract is written dead, and the factory will be under pressure to make each piece flat.

All in all, the quality control of large quantities of jackets does not depend on prayers, but on process card points. From proofing tests to workshop parameters, from ambient humidity to finished product sampling, data records are left at every step. If you can do this, the source factory naturally dare not fool you. If your team lacks experience in this area of inspection, you might as well find a supplier with standardized system support like Yasenman and let them use professional templates to reverse manage your quality inspection process. Sometimes it is more efficient to use force than hard bars.? The waterproof of jackets is the bottom line, and the flatness of the pressing glue is the conscience. If this bottom line is held, the order in your hand will be considered to have really fallen to the ground.