Single machine is main equipment for corrugated box production, production of semi-finished single machine how the quality of corrugated cardboard, cardboard boxes directly affect production costs,cast bronze and production of base paper is the main material cartons, carton 75% of the cost of production left and right from the raw materials.
If the single machine production of corrugated board to increase the nonconforming or defective, it means that base paper and other waste materials, production costs increase, production profits declined. bronze bushing Carton industry in general in the current market environment in the profit, the better off single machine production technology, control equipment performance and operating techniques, control the quality of raw materials, prevention of quality problems and improve the semi-finished single machine pass rate, its significance becomes evident.
1. Semi-finished corrugated board knowledge of the quality of standard definition.
Single-sided corrugated board forming machine as the production equipment is the basis of product quality cardboard boxes,dry bushing single-sided corrugated board machine production of semi-finished quality of the state, no more than three basic characteristics,plain bearing qualified products, defective products and defective. Qualified means the quality of corrugated board are entirely consistent with the quality requirements of relevant standards; refers to corrugated board rejects one or a number of indicators do not meet the quality requirements of relevant standards; defects is between qualified and unqualified goods between goods, and poor quality goods minor defects, such as rough edges, size differences,sleeve bushing local degumming, blistering, sloughing Leng, oblique flute, breakdowns. The three standards are generally within the factory standard definition only. National standards for the original light industry definition of corrugated board is based on product use and the quality and grade of raw materials, will each corrugated board (three-tier structure) is divided into superior products,DU bushing first-class products, qualified and unqualified products. Among them, the superior product for the export of goods and valuables packed
bushing Corrugated board; first-class products for the domestic corrugated cardboard packaging materials; qualified product for the short-haul, low-cost packaging with corrugated cardboard. Three types of standards also divided the four standard values in order to adapt to different packaging requirements. National standards also provide the original of adhesion of corrugated board is not less than 588N / m; corrugated board water delivery (in-line water) was 14 ± 2%; quality requirements for the appearance of corrugated board surface should be smooth, clean, brass bushing do not allow a lack of material, the thin edge, trimming should be neat, firm adhesion, the unglued parts and per square meter less than 20cm2. Mould guide plate The sample of non-conforming product is defined as the rules for the grant to determine the quality of the concerned product. Practice situation indicates that a number of excellent products quality indicators failed, may become first-class goods or qualified, a number of first-class product quality indicators failed, it may become qualified. plasic bushing However, within the meaning of a single national standard is two layers of corrugated cardboard and a layer of corrugated cardboard made of corrugated paper board adhesive. The single unit two-story single-unit production of corrugated board, not through the cladding process, the bursting strength, compressive strength side will be greatly reduced, and therefore can not apply national standards for corrugated board, so far we have no single country the standard semi-finished corrugated board machine, the general system of the enterprise is a fairly standard set by their own corporate standards, semi-finished corrugated cardboard production process control, but not necessarily detailed enterprise standards, complete and accurate, in practice, pay attention to the ongoing analysis and summary, so that appropriate amendments and improvement of standards in regulating the production process and technique to play a role in promoting good.
2. Single machine semi-poor quality of the post-processing.
Single-sided machine corrugated cardboard production after the semi, but also through the laminator will be pre-printed on glossy paper and the two-story single corrugated carton board laminating, in order to form a single three-tier structure of corrugated board, and through the forming die can be finished products made from cardboard boxes. From the carton after processing characteristics of the production process can be seen, to maintain the flatness of corrugated cardboard, mounted on cardboard attached to ensure the quality and cutting precision, has a crucial role. If the single machine production out of the semi-finished corrugated cardboard significant warpage, will affect the normal automatic laminator paper and corrugated board accurate positioning, some of the more severe deformation of corrugated curl, laminator operator had to warpage The corrugated board to rub off in the opposite direction, to keep the required automatic document feeder flatness requirements, but after rubbing off corrugated board after the destruction of the compressive strength will be greatly reduced after forming cartons. If the single-sided corrugated board warpage powerful machine, using hand-operated veneer laminating machine, the three layers of corrugated board is also prone to warping defects arc, semi-finished products to the die-cutting machine when cutting, it will also give normal feeding and positioning cause some obstacles to the quality of the molding boxes. Therefore, in the single machine production process, must pay attention to control the line of corrugated board of water and formation, which is the basis for ensuring the quality cartons.
3. Single machine semi-quality problems in the analysis and control requirements.
Production technology situation indicates that single machine production of corrugated board of good quality and the quality of the pass rate boxes have a reliable guarantee. I found the quality of track management, sometimes despite the raw material is qualified, but because single machine production technology and improper operation of technical control, such as running to catch speeding production, it is easy to heat due to board a short time, and the peak watt flute the adhesive enough to reduce the hardness forming cardboard, and prone to problems of adhesion down. It is worth mentioning that, if the ancillary facilities to configure the single machine failure, the use of excessive speed, the machine is difficult because the water on the base paper for quick adjustment of the balance in tile paper and paper moisture content in the large disparity in the case of Paper deformation coefficient of differences, on the very likely lead to significant warpage of corrugated board phenomenon. Therefore, the machine production rate should be based on the level of base paper moisture content, the quality of the pros and cons of Paper, preheat temperature, size of area and the situation, considering the reasonable control of a suitable degree. I believe that the single machine production speed with the speed slightly higher than the medium, the accuracy of the effective maintenance of equipment to improve the hardness of the molding corrugated board, corrugated board to maintain a balanced moisture and warping appears corrugated cardboard, pour flute, helical Lenz, foaming, degumming and other quality problems, is feasible control measures.
4. To focus on the single machine test control of semi-finished corrugated cardboard.
Since the production of two-story single machine is difficult to accurately detect the edges of corrugated board compression strength value, often just by touching hand to determine the hardness of the quality of corrugated board forming conditions, but after all this testing is only approximate, roughly the quality of the judgments, the lack of science, accurate data, process control the production process to bring certain difficulties. To this end, the author in testing practice, the invention of the plane on the second floor of the strength of corrugated board testing method to obtain a scientific test data to facilitate accurate analysis of the single machine production process control situation. The approach is: first make a cast iron cylindrical diameter 11.7cm bottom bracket, the thickness specification is 2cm, so the use of electronic compression strength tester can detect the plane compressive strength of corrugated board. Test before taking a single tile (two) with a corrugated cardboard, with the YQ-Z-7-type knife cutting several pieces of quantitative standard sample specimen (area 100cm2). Testing, the first cylindrical end of care under the plate on the test apparatus, the first zero of the instrument calibration, you can put on the circular cylindrical samples for testing on the pedestal, when, after crushing the sample screen The data shows, the value of the compressive strength of the sample plane. Practice test case shows that when the single machine production temperature, speed or adhesives, and other controlled well, the compressive strength of corrugated board on the high plane. Detected using this method of forming corrugated board hardness, for those with a certain quality level specified in the contract production base paper carton, corrugated board can be detected through comparative analysis and to develop a two-story semi-plane compressive strength of corrugated board technical indicators, with the company's internal quality standards can play on-line semi-finished good control effect. Single-sided corrugated board machine for semi-finished products, in addition to its plane compressive strength testing, we must also test its adhesive strength, corrugated paper, adhesive layer and in the well, its overall strength will be high, usually the production site is generally used "tear off Law" W paper and in the paper apart and see paper to determine the extent of raising the quality of bonding, the laboratory can use the electronic compression strength tester adhesive strength of corrugated board testing, test data obtained as a Quality Criteria. In addition, the thickness of corrugated board testing can not be ignored, if worn or corrugated roller corrugated roller gap between the improper adjustment will affect the thickness of corrugated cardboard, and corrugated board thickness is an important indicator of customer quality requirements, once the thickness of corrugated board not up to standard requirements, will result in quantities of defective products, therefore, the production process must focus on the thickness of corrugated board testing device can be used to detect the thickness of the standard to prevent the production of substandard goods.
5. To focus on the single machine proper use and maintenance.
Corrugated is a core component of single machine, the mold is formed of corrugated board, corrugated board processing quality of the very important role to play, so, usually to focus on the proper use and maintenance of Corrugated. Corrugated single machine under the general position is fixed, through the spring, pneumatic or hydraulic means to the next on the Corrugated Corrugated apply some pressure. Corrugated roll as an active roll, shocked by its teeth meshing with each other on the corrugated rollers, and driven by the roll surface pressure on the flute corrugated roller to achieve synchronous rotation molding. To ensure uniformity of Corrugated, smooth operation, the chain is not too tight or loose the phenomenon exists, otherwise the wheel position should be adjusted. Corrugated shape, the upper and lower corrugated roller to a certain clamping force between to achieve. The clamping force on the corrugated roller from the left and right, which is easily distorted roller causes the force, to obtain a uniform distribution along the width of the pressure roller to have the crown to compensate for the compression of the deformation. In the production process, pay attention to prevent abnormal pressure load Corrugated production, to reduce abnormal wear and tear, which requires the cooperation must master the corrugated roll pressure, that is, to control the upper and lower rollers the gap and parallelism, which is a very important part of the production. In addition to the proper use of corrugated rollers, adjustments should also focus on the maintenance of corrugated roll, corrugated roll shaft bearings used for a time prone to damage, will affect the normal engagement between Corrugated, Corrugated resistance to operation increases, the increased wear and tear of mechanical components, produced by the corrugated board quality will be affected, it usually should be timely, it was discovered the problem in time. Corrugated's "tooth" in the process of pressure Leng easy to wear, so that corrugated cardboard cartons of varying low intensity, it usually should be regularly tested and found obvious wear should be removed to re-coating process to to ensure the quality of corrugated cardboard. Also note that usually scraps of paper on the roll surface, impurities in the clean up, clean to prevent foreign matter on the roll wear of the tooth; the lubrication of parts to be lubricated in strict accordance with the provisions to ensure that parts achieve the normal lubrication; in the mechanical operation of the process such as abnormal noise, should be promptly shut down checks and troubleshooting, to avoid the machine running while sick damage caused by the abnormal.
6. To focus on single machine with paper quality control.
Single machine production of semi-finished board is formed by the cardboard and corrugated adhesive, and if they disparity between the high and low moisture content is too large, then the base paper in the absorption of binders and heating, the base paper expansion will significantly change increase, which is likely to cause warping of cardboard, on the one hand laminating process effect the quality of nonconforming product appears to increase the probability of the overall strength of the other boxes will significantly decrease. So, roll on the machine should be preceded by the moisture content of base paper for testing, try to choose water content close to the cardboard and corrugated for forming support to prevent the expansion rate because of differences in base paper of corrugated board is too large leaving there warping deformation and reduce the rejects.
7. To focus on single machine adhesive body control.
Single machine is the role of adhesive device in corrugated paper coated with adhesive on the corrugated peaks, it sided with the cardboard bonded together to form corrugated board. It is mainly from the glue roller, even roller, scraper, plastic tank and other components. When the single machine normal operation, glue and glue the bottom of the sink roll of adhesive contact and uniform rotation, starting with adhesives, by the appropriate restrictions even glue roller, the quantitative peak of adhesive coating to the flute. Sizing roller surface polished by grinding the structure, but also will roll into a wavy surface processing, so that the glue evenly to the peak shape of the tile flute. General requirements for the amount of adhesive coating corrugated peak width of about 1.5mm. Corrugated roll sizing roller and adjust the gap should also note the general case to meet the coating, the gap as small as possible is appropriate. Even roller is used to control and adjust the sizing roll the amount of surface with a plastic, therefore, adjust the leveling roller, glue roller gap is important, the gap is generally between 0.2 ~ 0.3mm. Roller is also equipped with leveling blade, its role is to absorb on the surface of the adhesive roller shave, making the roll surface without adhesive state to the next cycle of work. The role of plastic tank is dressed adhesives, adhesive and to supply circulation to the lower binder viscosity Buzhi Yu condensation heat and maintain a certain level. Always pay attention to the use of the device under the coating, timely cleaning, will affect the viscosity of the adhesive paper dust and impurities, clean, ensure the normal coating and improve the quality of adhesion of corrugated board.
Single-sided corrugated board machine semi-finished products quality control, involving all aspects of the production process, and to accurately grasp the operation of process technology, the proper use and maintenance of a good machine, is crucial to the control link, which requires that we usually have to pay attention to production technology the check, while semi-finished products through the production process on the quality of corrugated cardboard careful inspection and control, semi-finished products can not only effectively prevent the occurrence of cardboard processing quality, and can better improve the processing quality of corrugated board, to meet the quality of post-processing procedures requirements, to improve product quality carton and lay a solid foundation.