Environmentally friendly, High efficiency will be the main trend of future packaging industries. In terms of composite adhesives, solvent-free adhesives will replace traditional solvent-based adhesives, which has become a consensus of the packaging industry. The solvent-free adhesive is more widely used in the flexible packaging industry.
What Are Solvent-free Adhesives
Solvent-free adhesives are a viscous substrate, which can connect together by means of their viscosity. They are viscous liquid at normal temperatures, such as an epoxy resin which Is one of the most important auxiliary materials and has extremely wide applications in the packaging industry. Solvent-free adhesive mostly is adopted for the solventless laminating machine, also can be used on existing solvent drying compound equipment which is suitable for many color printing plants to improve the high residual solvent, reducing production costs, no need to input new equipment.
Composite adhesive for flexible packaging is constantly undergoing technical improvement and innovation. The new type of solventless adhesive performance can completely meet the dry composite requirements among the most flexible packaging materials and can be used on a solvent dry compound machine. It can meet the requirements of drug & food packaging.
Features And Advantages Of Solvent-free Adhesives
Solvent-free adhesive is an ideal replacement for solvent adhesive.
1. Effectively reducing the residual solvent
Since it is a solvent-free adhesive, the adhesive itself does not bring the second solvent contamination, the printed film can further decrease the residual solvent when passing through the drying oven, adopting a solventless adhesive is quite effective to control residual solvent.
2.High initial adhesion
The high initial shear strength of solventless adhesives makes it possible for real-time slitting and delivery without curing. This performance is quite effective for shortening delivery time.
3.Relatively low cost
Usually, the required coating amount is 1.6g to 2.4 g per square meter, not any solvent used, so its composite cost per square meter will significantly lower than solvent-based composite.
4.Improving the working environment, reducing pollution, reducing work strength, and avoiding the risk of the fires
Since the solventless adhesive does not need to be diluted, it can be directly used for production, reducing the labor of the operating worker and also avoiding the concentration of solvent in air, which is advantageous for workers. Of course, without the existence of solvent, it also can avoid the hidden risks of fire.
5.Effectively reducing the occurrence of quality accidents
With a solventless composite product, it can directly see the quality of the product. Only the appearance and composite intensity of the product should be carefully checked when going off the production line. After a period of time, as the increase of adhesive composite strength among the adhesive molecules, the appearance will become better. For the composite of the aluminized product, the solventless adhesive can effectively prevent aluminizing transfer.
Solventless laminator adopts green environment-protection technology. It has occupied a high market share in Europe and the United States, accounting for 80% to 90% of the composite machine. It can ensure the non-pollution of the composite packaging of food & drugs, increasingly applied to the composite film packaging industry and the flexible packaging industry.
Solventless laminator has many advantages such as reducing cost, improve product quality, environmental protection, safety and stability production, which has a high production practical value.
1.Taking the S1 L90 series solventless lamination machine as an example, solvent composite is safer and more healthy, compared with the ordinary dry compound process, 100% of the adhesive can be achieved when using S1 L90 Series laminator, because there is no solvent composite in the production process, avoiding the use of organic solvents, at all solve the residual solvents problem. Solvent-free composite is a healthier composite process. And there is no solvent residue, reducing the contamination of packaging content, especially for the packaging of food, pharmaceuticals, etc.
2. Solventless composite equipment can reduce production costs. It doesn’t have a drying channel, so the structure is compact, with small occupied space. The equipment cost is low, which can significantly reduce the cost of composite film production.
3. In general, the coating amount solvent-free composite is usually from 1.3-1.8 g / m2, while dry composite is 2.5-4 g / m2, and therefore, the amount of adhesive consumption can be reduced by about 50% compared to dry composite. Although solvent-free glue has a higher price, the overall raw material cost can also decrease by about 20%.
4. There’s no solvent-type adhesive and can reduce energy consumption. At the same time, eliminating the long-time volatility of the solvent adhesive in a drying oven.
5. Solvent-free machine has a high-speed composition production line and the highest speed can reach 480m/minute, generally approximately at 300m/minute, with high production efficiency.
6. The structure of the solvent lamination machine is compact with fewer operators, reducing labor costs.
7. Solvent-free composite has a high safety and fire and explosion risk can be reduced to the minimum. The factory and production workshops do not require special measures for fire prevention, explosion-proof.
Solvent-free composite has a wide range of applications. With the advantages of environmentally friendly, hygiene, high efficiency, the solventless laminator is especially applied for the flexible packaging industry.
Solventless lamination is a method for the composite of two or more substrates using a solvent-free adhesive. The solventless laminator is the equipment which can be applied for a solvent-free adhesive composite. Composite substrates mainly include BOPP, PET, NYLON, CPP, PE, VMPET, VMCPP, PVC, aluminum foil, paper, etc.
Types of solventless laminator
There’re three types of solventless laminator including types of exclusive solvent-free, the combination of solvent-free and dry compound, multifunctional combination.
Exclusive solvent-free laminator is only used for solventless composite, once molding with two-layer structure or three-layer structure. It can be classified into types of manual roll changing and automatic roll changing.
The equipment adopting the combination techniques of solvent-free and dry compound can be used for solventless composite and the coating unit can be switched. This type of equipment can be connected with two machines, thereby achieving a one-time molding of three-layer structure. For example, the first machine produces PET / AL adopting a dry compound method and the second machine can complete the composite of PET / Al and PE using a solventless method.
The Multi-function type equipment can achieve solventless, dry compound, PVDC coating, cold sealing positioning coating, hot melt adhesive coating, reverse printing, etc, through switching coating units.
Work Principle Of Solventless Laminator
The mostly used solventless laminator has a structure of two-layer composite, a single station unwinding, which mainly constitutes of an unwinding unit and coating unit as a first-layer, and an unwinding unit, a composite unit, a rewinding unit. The structure of the solventless laminating machine includes a two-roller device, a winding device, and solvent-free adhesive coating composite equipment. The outstanding feature is that after entering the composite through a special coating device, it is not necessary for drying. The solventless composite machine satisfies the requirement of a solvent-free adhesive coating,which is a significant difference from the solvent drying compound equipment. The solvent-free machine has precise control for the temperature of the coating equipment, relying on the adjustment of temperature and the viscosity of the adhesive for promoting the coating application. It is equipped with a closed-loop tension controller which can strictly control the winding tension.
For more professional introduction, please visit the article page of why choose a solventless laminator.
The specific installation position, lighting angle and the brightness for the navigation light, all have special requirements. The irregular use or failure of the navigation light will transmit the error signal and caused huge obstacles for the collision prevention.
Masthead light
It is installed above on the mast of a ship or above on the centerline, showing uninterrupted in the 225 degree horizontal arc.
Sidelight
It is installed on the left and right sides of the highest boat deck. The screen of sidelight facing the light surface should be coated with the berlin black. The height of the screen is at least equal to the height of the lamp. The boat which has a length of more than 80 meters, should install red, green sidelight on the bow, stern.
Stern light
The boat stern light should be installed in the middle of the stern. The height of the light should be kept horizontally with the sidelight as possible, but can’t be higher than the height of the sidelight.
Headlight
The marine headlight is placed in the bow of the pusher barge and the height can’t be higher than the headlight.
Red-green flashing light
It is the left red, right green marine flash lighting installed above the sidelight and its flashing frequency is 50 to 70 per minute. The boats with a length of less than 12 meters can also adopt a water torch instead of red and green flashing lights and should keep light bright with clear color.
Anchor light
The marine anchor light is installed on the top of the mast with all-around flashing.
Each provision concerning the navigation light must be observed from sunset to sunrise. The signal lights can also be displayed in the situation that the visibility is poor during the day. At the time of navigation light displaying, the lighting which confuses or weakens the display performance of the signal light, can’t be allowed to display.
The Function Requirements
1. The navigation light should be waterproof and the lamp holder should have a structure that prevents its own loose. It should adopt a two-filament bulb. The control box should be in the cab and the switch of the control box should have an instruction to explain its use. The cable of the navigation light is fastened with the complete lampshade & bulb and the good & reliable ground.
2. The switch should be set on the navigation light control box, used to convert the power supply. Each navigation light should be powered by a separate branch that is placed close to the control box installed in the cab and should adopt the switch and fuse which are installed in the control box for control and protection of each insulation of these branches.
3.The navigation light control box should be powered directly from the main distribution board and emergency distribution board.
4. There should be an automatic indicator that can make an auditory or a visual alarm signal at each navigation light and there should be some measurements which are adopted to prevent the navigation light go out due to the signal light failure. The auditory and visual alarms for the failure of the navigation light control box should be provided.
The article has combed the key requirements and regulations for navigation lights and signal lights, giving an explanation for the various types and functions of the boat navigation light.
The marine navigation light, also known as a marine signal light, is used to show the state of ship sailing or parking, which can indicate the navigation direction at night and the size of the ships. It is an important basis for ships to adopt avoidance measures and effectively avoid collisions among ships, especially at night or in poor visibility.
The Categories Of Marine Navigation Light
The ship navigation signal system is an important part of the ship's security and it’s an important lighting system to ensure the safety of night boating. According to the international regulations for preventing collisions at sea, the navigation signal equipment must be installed on the ship with ship navigation lights, ship signal lights and foghorn. The navigation lighting system includes headlight, sidelight, stern light, towing light, anchor light, yellow all-round flashing light, maneuvering signal light and flashing light.
Headlight
The ship headlight is white light placed above the centerline of a ship, showing uninterrupted in the 180 degree horizontal arc.
Sidelight
The sidelight generally refers to the green light on the starboard and the red light on the portside. Each light is showing uninterrupted in a 112. 5 degree horizontal arc.
Stern light
The marine stern light is the white light which is installed on the place as close to the stern as possible.
Towing light
The boat towing light refers to the yellow light placed as close as possible to the stern, showing uninterrupted in the 135 degree horizontal arc.
Anchor light
The anchor light is a type of boat signal light, which is displaying uninterrupted in a 360 degree horizontal arc.
Flashing light
A marine flashing light is a signal light that is flashing with the frequency of 120 or above 120 per minute.
Navigation light indicator
It is an indicator centralized control of the on-off of the navigation lights and a device that can give an alarm when the navigation lights fail.
For more detailed introduction, please visit the article page of Basic explanation for marine navigation light.