Template adhesive powder

Template adhesive Application 1. It is the template used for cement production 2. Template gum is a modified melamine urea formaldehyde resin powder agent Product index Appearance Milky white PH value / 23 °C 8.5 ± 0.5 Viscosity / 23 °C (175 ± 25) cps Solid content (2ht/120 °C) (50 ± 1)% Curing time / 100 °C (70 ± 5) sec Water mixed (times) <0.5 Store 1. To avoid sunlight 2. Stored in dry storage at low temperature 3. Viscosity time although the increase of time 4. Recommendation: the principle of first come first use 5. Storage period shortened with increasing temperature. Proposed transfer adhesive process Substance name Dose ratio Template Plastic 100 Ammonium Chloride(NH4Cl) Summer 0.1 Winter 0.4±0.2 Fillers(Flour) 19±1 Plastic viscosity after the proposed transfer After the viscosity of gel preparation is between 3800 to 5500cps, and its amount according the fillers’ dose ratio to adjusting. Gel preparation methods By high or low speed mixers, cement production template, start blender, then added to the Template Plastic, Ammonium Chloride(NH4Cl)and Fillers(Flour), after the mixing time is 10 to 15 minutes, stir well before use to ensure that, until the dough is not until the resin. Tuned plastic should be used within 45 minutes, so as to avoid wastage. Just make the changes according to temperature; moisture content was adjusted level of curing agent and the amount of flour to meet the pre-press and production requirements. Activity of In general, the temperatures below 35 degrees Celsius, the product of the activity of more than 2 hours. Veneer requirements Veneer surface should smooth and clean, no dust and resin material. Veneer thickness shall be the same. Moisture content was to be 12% to 16%; higher moisture content will increase the bubbling, glue seepage and lack of gel dangerous. Adhesive According to veneer’s quality, double-sided adhesive capacity of 280 to 340g / m², veneer surface is usually rough, needs more amount adhesive thin veneer. Thin veneer glued should to remain low when the amount of adhesive to avoid gum and bubble through, especially when moisture content is high should be pay attention. Clean The glue and adhesive equipment should be cleaning before rubber by hot water, once cured rubber is insoluble. If the glue residue and for clean water is ranked into the sewer, which would cause pollution, Therefore, we should deal with the appropriate measures. Preloading 1. The pressure is 7 to 12kg/cm ². 2. Pre-press time is 30 to 90 minutes or so. 3. Preloading pressure should be lower than the hot pressing pressure 4. When the moisture content veneer lower the amount of adhesive is low, this layer had dried in greater danger, especially in the dry climate circumstances. 5. Preloading can improve the bonding quality, shorten the hot cycle, because the slab after preloading the Maintenance and hot plate when the loading easier. 6. Group blank time must be as short as possible to ensure the group blanks in the first veneer film has sufficient initial adhesion to plastic in the pre-press operations to flow to the opposite of the single-board, with no hot compared to more should be noted that the risk is too dry layer. The reason is that when the slab when the direct hot melt glue hot press in the flow of development, but in the cold press kind of can not restore the flow of adhesive. Heat stress The density of the veneer-tree Glue stress ≥550kg/m3 (11±1)kg/cm2 ≤550kg/m3 (14±2)kg/cm2 Glue pressing time 1min/mm (slab thickness) + 2min Glue pressing temperature 110 to 115 degrees Celsius