Grp door manufacturing system

A glass fiber reinforced plastic (GRP) door manufacturing system configured to manufacture a GRP door composed of a wood frame, a GRP door skin covered on each of an upper surface and a lower surface of the wood frame, and a flame retardant urethane foam filled in a space within the wood frame, wherein the GRP door manufacturing system comprises:

• a GRP door skin stacking stand, wherein the GRP door skin is stacked on the GRP door skin stacking stand in multiple layers;
• a wood frame stacking stand, wherein the wood frame is stacked on the wood frame stacking stand in multiple layers;
• a first conveyor configured to transfer the GRP door skin supplied from the GRP door skin stacking stand, forwards;
• a plasma processing unit comprising plasma processors, the plasma processors being respectively located at an upper surface and a lower surface of the first conveyor, being configured to be moved leftwards and rightwards by power of a driving source, and configured to respectively plasma-process an inner surface and an outer surface of the GRP door skin moved while riding on the first conveyor;
• a second conveyor located in front of the plasma processing unit and configured to transfer the GRP door skin supplied in a plasma-processed state, forwards;
• a bonding unit located above the second conveyor and comprising an application roller configured to apply an adhesive on the inner surface of the GRP door skin;
• a third conveyor configured to transfer the GRP door skin, where the adhesive is applied;
• a preheating unit surrounding the third conveyor and configured to preheat the GRP door skin moved while riding on the third conveyor;
• a robot arm located in front of the preheating unit and configured to be operated according to a control signal preset in a control unit;
• a plate provided at the robot arm;
• a wood frame clamping part provided at an outer portion of the plate and configured to clamp and take out the wood frame stacked on the wood frame stacking stand;
• a GRP door skin and wood frame inserting unit comprising a GRP door skin absorber provided at an outer surface of the plate, wherein after the wood frame clamping part clamps the wood frame, the GRP door skin absorber absorbs and takes out the GRP door skin, wherein the GRP door skin has passed through the preheating unit;
• a GRP door skin reverse unit located at an upper-front portion of the preheating unit, wherein while another GRP door skin is absorbed, wherein the another GRP door skin has passed through the preheating unit, the GRP door skin reverse unit is configured to reverse and support the another GRP door skin, wherein the inner surface of the another GRP door skin is directed downwards;
• a lower mold comprising a core where the wood frame and the GRP door skin ejected from the GRP door skin and wood frame inserting unit are supplied and received;
• a flame retardant urethane foam inlet configured to fill the flame retardant urethane foam into the space within the wood frame received in the core of the lower mold;
• and
• a forming unit comprising a forming mold configured to form the GRP door, wherein while the another GRP door skin reversely supported at the GRP door skin reverse unit is supplied at the upper surface of the wood frame filled with the flame retardant urethane foam by driving the GRP door skin and wood frame inserting unit, the wood frame and the GRP door skins covering the upper surface and the lower surface of the wood frame are thermo-compressed together by combining an upper mold.