When producing wire rope, the traction disc is made of cast steel, and the crane drum is also used for winding wire rope. Cast steel should be ok, for reference only.
Crane users need high-quality steel wire rope, which should have long service life, high stability and reliability. Fretting fatigue is the main reason for the failure of steel wire ropes used in atmospheric environment. At present, the first preventive measure against fretting fatigue in the field of steel wire rope in the world is phosphating coated steel wire rope produced by patented technology. After manganese phosphating or zinc-manganese treatment, the surface wear resistance and corrosion resistance of wire rope are improved in an all-round way, and the fatigue life of wire rope is greatly improved. The fatigue life of smooth steel wire rope with the same structure is three times (under comparable conditions in laboratory), which can be verified by fatigue test. If you have your own fatigue testing machine, you can do a comparative test yourself. This test result is the most credible. The service life of wire rope is proportional to the fatigue life, and the fatigue life will also be extended in proportion.
Phosphate coated steel wire rope has longer service life, lower use cost and better stability than smooth steel wire rope. Phosphating steel wire rope is produced by patented technology. Because it is in short supply, it is difficult to buy it at present, so it is necessary to ask the wire rope manufacturer more. Please note that the name of wire rope, such as phosphating wire rope, must be indicated in the purchase invoice to prevent illegal enterprises from infringing their legitimate rights and interests. In addition, patented products are generally painted with patent numbers on the outer packaging of wire ropes. The warranty shall include the main technical indicators, such as the type and weight of phosphating film (phosphating film has great influence on the service life of wire rope, such as wear resistance and corrosion resistance, etc.), for reference only.
What is the material of crane drum?
Generally, it is a casting cylinder made of HT200.
Generally, the welding drum is Q345, and there are also 45 steel.
What is the material of wire drawing machine drum?
Generally, tungsten carbide is sprayed on the surface of steel castings.
What is the material of drum tissue boxes in public places?
Generally there are plastics and stainless steel. There is a wall-hung tissue box of Fengjie bathroom brand in my home, which contains large rolls of paper. They say it's made of ABS. It's very durable. Indeed, I really felt much better when I got it. The others are also made of ordinary plastic materials, which are not very good in quality and brittle.
What are the specifications of roller self-adhesive materials?
We need any specifications we want. We usually buy raw materials in bulk, and the printing factory processes molds according to customer's needs, and any specifications can be used.
What materials are needed and what are they made of?
Raw materials such as reed, wheat straw and wood are cut into pieces (used to produce chemical pulp) or wood chips (used to produce ground wood pulp) in the material preparation section, and then small pieces of raw materials are put into a digester, added with chemical liquid, and steamed with steam to make the raw materials into pulp, or the wood chips are sent to a wood mill to be ground, or they can be ground after a certain degree of cooking. Then wash the pulp with plenty of clean water, and remove coarse chips, knots, stones and sand from the pulp through screening and purification. According to the requirements of paper types, the pulp is bleached to the required whiteness with bleaching agent, and then beaten with beating equipment. Then various auxiliary materials, such as fillers, sizing agents, sizing agents, etc., are added to the pulp, and then purified and screened. Finally, the paper pulp is sent to a paper machine, filtered for moisture in the wire section, squeezed and dehydrated, dried in a dryer, calendered and coiled, and then cut, rewound or cut to produce rolled paper and plain paper. If the production is to produce coated printing paper, it needs to be dried in the middle or produced into roll paper and then coated.
What materials are commonly used for paper laminating? 30 points
Various film-type self-adhesive materials are widely used in self-adhesive labels. This paper introduces the lamination methods of these self-adhesive materials in detail. 1. Self-adhesive labels are usually coated with transparent BOPP film on paper self-adhesive materials, which can protect patterns, prevent water and corrosion, and increase the three-dimensional sense of labels. Other types of films, such as PET and PVC, can also be used as composite films, but they are not widely used. Due to the high cost, the laminating of paper roll materials has been gradually replaced by UV glazing technology. According to the printing processing method of raw materials, self-adhesive labels can be divided into single-sheet laminating and drum laminating. Sheet-fed paper is coated on a laminator. The rolled material is laminated in a laminating station or a special laminator in a labeling machine. ① Sheet-fed laminating According to the function of laminating equipment and the characteristics of composite film, there are two laminating methods for sheet-fed self-adhesive labels: coating and laminating-completed on the laminating machine. The compounding process is as follows: firstly, the adhesive is coated on the surface of BOPP film, and the solvent in the adhesive is volatilized by a drying device; Then, the paper and the film are compounded at the compounding station, and they are combined into a whole under the extrusion of the hot roller, thus completing the laminating process. Pre-coated film compounding-the surface of the composite film is pre-coated with adhesive, and there are two kinds of films: hot melt adhesive and pressure sensitive adhesive. The laminator is equipped with a heating impression cylinder. When laminating, the precoated film is in contact with a single sheet of paper. Under the action of the hot-pressing roller, the adhesive melts, so that the film and paper are bonded together. If the pressure-sensitive composite film is used, the heating power supply can be turned off and only pressure recombination is needed. ② Web film coating wftianno/ According to different equipment, web film coating can be divided into: composite film with backing paper-it is carried out on a labeling machine, using a special composite film with backing paper and covering the film under the action of a composite device. This is a traditional plastic film mulching method. In recent years, it has been replaced by the process of using bottomless paper composite film. Non-bottom paper composite film-is carried out on the labeling machine, and the principle of film covering is basically opposite to that of non-bottom paper composite film. The bottomless paper film is rewound to replace the backing paper by the surface smoothness (surface tension) of its own material. After the adhesive is adhered to its surface, it can be peeled off without leaving any glue marks. The material used for the bottomless paper film is BOPP film with low surface tension. Paperless plastic film is the most widely used plastic film material at present because of its low cost. Dry laminating-carried out on laminating machine or gravure press, mainly used for laminating thin film materials. Dry film coating of reel material is suitable for large quantities of label products, with good film coating quality and low cost. Generally, after bonding, the label will be processed by die cutting and waste disposal on the processing machine, such as some battery labels and alcohol labels. UV film covering technology-the latest foreign technology, mainly used for unit rotary labeling machine with UV drying device. The process principle is that firstly, UV glue is printed on the surface of film-coated material by ordinary printing unit, and then cured into pressure-sensitive adhesive by UV drying device. Then the common BOPP film (the surface of the common composite material has been corona treated) is compounded with the roll material at the laminating station to complete the laminating process. UV coating cost is low, the tension change of composite film is small, no special film is needed, and it is suitable for high-speed production. UV film mulching is a promising technology, which has been applied in developed countries in Europe and America. 2. Technical requirements of the laminating process There are many factors involved in the laminating process. It is necessary to understand the influence of various process parameters on the quality of film covering and correctly handle the relationship between them in order to achieve the best effect.
What's the difference between a web printer and a plastic printer? What are the materials of common plastic bags? Please give us your suggestions!
Unable to print plastic 92320769.
What is a general machine tool bed made of cast iron?
Normally it should be gray cast iron. Easy molding, easy processing, shock absorption and low cost.
What material is the paper core made of? What if it blocks the toilet? 5 points
Find someone to get through it. The core of the drum is made of cardboard, which has a high density. Soak for a few days and it won't rot.