It is not that easy task to make rubber rain boots! Preparation is key; get everything set up first: right metal lasts, premium raw materials,reliable machines,experienced workers,knowledgeable technician,essential power and water energy…
Did you know where the raw material rubber come from? Yes, you may have already guessed it, the rubber trees.It is very early in the morning when the sun get up one second ago, diligent rubber cutters are holding sickles at hand to cutting liquid from the trees, milk white sap slowly flowing into the containers.After a series of chemical and physical changes, solidification, drying, smoking, sorting, forming and finally rubber cubes that meet international packaging standards are ready to go to rubber rain boots factories.
Now let’s see how factory workers making flower printed rubber rain boots. Firstly, placing the rubber cubes in specific dispersion mixer to get 2-3cm thick rubber pieces after more than a dozen mixes. Secondly, mixing rubber pieces with color masterbatch and with other chemicals like CBS,PBN,HAF, S,CaCO3 etc to get colored rubber pieces. After dozens of times rolling, you will see thin 2-5 millimeters rubber pieces are coming to cut into boot shaped pieces, they look like pieces of papers from a distance,the process like a pastry chef kneading dough, kneading dough, and making dough. Thirdly, shaping the out soles with molds, alike to a child making a sand sculpture castle, putting sand into a mold, pressing it down, and pouring it out. And meanwhile,some workers are printing the flowers to the colored rubber pieces, before that, they have checked and picked up the bad printings; some are perfectly printing the logo to rubber pieces and get them cut by machines to insure each logo is in same size; others are fitting cotton socks onto the boots lasts and get them fully sprayed with glue.
Preparation work is done, workers are sitting at two sides of production line to do all following handwork, positioning printed rubber pieces to metal lasts skillfully,adding back and top strips correctly, placing out soles, pressing the bottom part of boots to let the out soles firmly glued to upper. Adding bottom strips, front logos, and what’s important here is quality control, checking every detail of every single boot, to avoid any defect on printing and boot itself, before they go to sprayed by matte or gloss surface oil. All of them are done in one go, skillfully and orderly.
Are you curious whether the printing will fall off easily or fading? No, not at all! Why and how they won’t? It is the right time to answer you! There is a very very very important process carried out by vulcanizing boiler! That is vulcanizing the boots! How we do that? It’s similar to bread baking with oven! Yes, you saw that correctly, and I wasn’t mistaken when I wrote it, rubber boots are neatly hanging on the iron boots racks, being pushed into a huge round shaped oven, with the help of vulcanizing agents, occurring physical and chemical changes under high temperature of 120℃in 60 minutes. One oven can hold 145 pairs boots, and three ovens there can hold 435 pairs and one day we got 3480 pairs rubber rain boots vulcanized. Vulcanization greatly improved the boots durability, wear resistance, anti-flex cracking and waterproofness.
Cooling them down after rain boots taken out from ovens! Like we are thrilled to await the warm bread just pulled from the oven. In cold winter, these warm boots are good at providing you with heating. I did that several times to stand by them to warm my hands.Ha ha.That’s really a good idea！
A laborious process is lasts releasing, that is to separate the lasts from the boots. Oh, prior to that, the experienced worker fixes the top and tailors the excess rubber from the boots opening. A necessary and must do unit is waterproof testing for each single boot. Like blowing a ball, put the rain boots in the water and use a handheld power tool to blow air inside. If there are no bubbles in the water, boots are fully waterproof and move to next stage, to be checked to pair left and right feet with the same boot size; if there is a leak, they have to be fixed and re-tested until they do not leak at all.
Now come to the final packaging stage,usually accomplished by women, who are born careful. First women Ms.Li is double checking if the boots opening is even and clean, if not, she will fix them. Women next her is checking if they are right the pair, the size of left boot and right boot is the same, and Ms.Wu is checking the printings on boots,whether it is good or not, and inserting matched insoles. Ms. Hu is hanging the right hang tags , cleaning the upper and a forty check if printing, logo, upper, everything is good before they are wrapped by papers and go into poly bags or boxes and into cartons. Now all are ready and wait for a final inspection before loading to ship.
Have you calculated how many steps in all to make a rubber rain boots? The answer is forty two. Wow! Now you believe it is indeed a challenging endeavor to make rubber rain boots. A lot of the process is performed by hand!However, we are much than happy if you send us any inquiry to talk about custom your rain boots today!