Q:What's the difference between plywood and plywood?

The plywood is logs into veneer or by wood sliced veneer, with adhesive glued into three or more layers of sheet material, usually with odd veneer, and the fiber direction of adjacent plates perpendicular to each other and gluing.

Q:The difference between a large board and a plywood

The vertical direction of the core plate (the difference between the core and the material) is poor, but the lateral flexural strength is higher. Both nail grip and water repellency are availableBetter than MDF and chipboard. The surface is generally rough and needs finishing (paint or decorative panels etc.). Simply speaking,A large piece of carpentry that must be nailed at home usually requires a large core board.But the large board itself uses a lot of glue, and a lot of glue or paint will be used in the finish, and the core boardPollutants are in open volatile state, so, home improvement must strictly control the use of large core board.

Q:What is an offset press? And what are the machines for printing paper?

Press the input in different ways, can be divided into the sheetfed and web offset printing machine; according to the chromatic number of a complete paper can be divided into single color, double color, four-color and multicolor printing machine; according to the maximum printing paper format can be divided into small press, six open, four open, a piece of paper and printing machine, in addition to a paper double-sided printing machine can be completed at the same time printed on both sides of the. According to the distribution system can be divided into alcohol machine (ie alcohol dampening offset press, water wheel (that is wet plate offset press) and waterless offset press.

Q:Plywood (multi layer), this side of the small hole is what happened, please answer in detail!

It is impossible to avoid, when wood production is 4 meters wide, 12 meters long, a large chunk of the (there are 6 meters wide, 24 meters long), pressure after cut into small pieces, if the intermediate transverse piece plate without splicing, the log requires 12 meters a long root, this kind of machine cost and material cost over dozens of times,A good plywood must be the case, but it's not that serious, but it's also one of the best ways to choose a board. Besides, the weight of the board is heavy and the middle board is a little more dense,

Q:Ceiling, how one stone slab

Grasp the main line thick, auxiliary line fine principle. 2 make sure you don't mark the wrong height

Q:What are the common quality defects of plywood?

The bonding strength is low, mainly due to the bad quality of the adhesive. The hot pressing condition is not controlled, such as low temperature, insufficient pressure and too short glue pressure. The moisture content of the veneer is too high, the amount of coating is insufficient, the quality of the single board is poor, and the aging time is too long or too short, and it will also reduce the bonding strength.

Q:What's the weight of the insulating board 1000*5mm?

1, 500V below the distribution room, choose 5mm insulation board, power frequency withstand voltage test 3500V1 minutes, not breakdown; in power frequency voltage test 10000V, 20S shall not breakdown.2, 10KV below the distribution room, choose 8mm insulation board, power frequency withstand voltage test 10000V1 minutes, not breakdown; in power frequency compression test 18000V, 20S breakdown.3, 35KV below the distribution room, choose 10--12mm insulation board, power frequency withstand voltage test 15000V1 minutes, not breakdown; in power frequency compression test 26000V, 20S breakdown.

Q:What is the thickness requirement of the insulation board in the distribution room?

Electrical properties and thickness requirements of insulating rubber sheets:1, 500V below the distribution room, choose 5mm insulation board, power frequency withstand voltage test 3500V1 minutes, not breakdown; in power frequency voltage test 10000V, 20S shall not breakdown.2, 10KV below the distribution room, choose 8mm insulation board, power frequency withstand voltage test 10000V1 minutes, not breakdown; in power frequency compression test 18000V, 20S breakdown.3, 35KV below the distribution room, choose 10--12mm insulation board, power frequency withstand voltage test 15000V1 minutes, not breakdown; in power frequency compression test 26000V, 20S breakdown.

Q:What is the density of the oil resistant rubber sheet?

The best way is to take a sample test. Fluorine rubber biggest proportion, nitrile rubber minimum proportion, mixed rubber 1.0~1.2 between. Chloroprene rubber compound is around 1.3

Q:The difference between wood cored plywood

Woodworking boards are made of plywood, but plywood is not necessarily a wood board. Plywood is the use of wood glue will be laminated or more pieces of wood together. The board is the number of pieces of wood glued together, then both sides of paste wood leather.