Functional Corrugated Paperboard and Carton Technology Innovation (I)

Functional corrugated paperboard and corrugated carton are the special packaging of technical innovation by the combination of modern science and technology and packaging engineering. It fully reflects the development direction of modern packaging technology. The key technology of functional corrugated paperboard and corrugated carton is traditional. Carton and corrugated cardboard are modified and the functional design and innovation of the traditional corrugated box structure.

Functional corrugated cardboard and corrugated boxes are numerous. There are many kinds of processing methods, and the use effects are different depending on the packaged product and the storage and transportation environment:

First, functional corrugated cardboard

(a) waterproof corrugated cardboard

In the high temperature environment, the moisture content of the packager or the product itself is high. The use of ordinary corrugated board will reduce the compressive strength of the carton. When the moisture content is high, the flat compressive strength and blood pressure strength of the corrugated board will be reduced. The water resistance of the corrugated board can be improved by different methods. The main products are the hydrophobic products. Cardboard and water-resistant corrugated cardboard

1 hydrophobic corrugated cardboard

Also known as water repellent paper puller, when exposed to water for a short time, the surface of the paper is processed to make the water splash. Prevent water from penetrating into the interior of the board [1] Processing method: The processing method of general hydrophobic corrugated paper is to coat and add [. Commonly used coatings are paraffin, silicone, Varnish and other water repellents. When the gloss of oil is low, the permeability is good, but too much penetration into the paper will reduce the hydrophobic effect. Therefore, it is best to brush on the surface of the cardboard before applying oil. A l 埴 starch slurry, sun dried and then coated with varnish, mosquitoes better = In addition, the coating plus appropriate amount of water additives, such as urea formaldehyde resin. Melamine I}j aldehyde resin. Poly-Cyclohexanone has been used to provide water-resistant coating for commercial coatings, and it will directly dissolve the waterproof coating on the surface of corrugated cardboard during processing.

2. Paraffin wax is applied to the two surfaces of the cardboard, and the core of the corrugated medium is spray coated. In this way, a corrugated board having a hydrophobic property of more than I island can be obtained. The patent name is M/Ik corrugated cardboard.

(2) Hydrophobic corrugated cardboard suitable for packaging in dry powdered products. In particular, it is a powder that is easy to cake after absorbing water, and it is also suitable for packaging goods that often enter and exit the cold storage. After being taken out of the cold storage, it is easy to dew condensation on the wall of the box, ordinary corrugated board will quickly absorb and reduce the compressive strength caused the cartons can not withstand the stacking pressure and pressure. Cardboard after hydrophobic processing will not significantly reduce the compressive strength before dew evaporation, and can protect products with mosquitoes

2 waterproof tile cardboard

Also known as waterproof or waterproof corrugated cardboard. When the surface is exposed to water for a long time, it is almost impervious to water, but it cannot be submerged, otherwise it will lose its waterproof ability. The results are similar to ordinary corrugated board. The main cover is a stool with its processing technique.

(1) Add J: Method: The melted taigen sweet fat or paraffin mixture is squashed down from the hopper mouth and coated on the horizontally running corrugated cardboard to form a layer of resin film or wax film on the cardboard surface. Having good water-retaining performance = If necessary, repeat this cycle on the other side to obtain double-sided waterproof performance.

(2) Uses: Glass-wool corrugated board is used for packaging rice salted products, frozen instruments and fruits and vegetables. It has a soft paraffin layer on the surface of corrugated cardboard. It is also suitable for packaging high-gloss furniture, pianos, precision instruments, etc.

3. Water-resistant corrugated cardboard

Corrugated paperboard with long-term immersion in water that does not show a significant decrease in strength has two types of equipment and processes for the production of water-resistant corrugated paperboard. Its processing principle is similar to dipping processing.

(1) Impregnating solution: Using paraffin or chloroprene synthetic rubber, polyphenylene butadiene, chloroprene, polyhydrocarbylsilicon difluoroacetate, and the like.

(2) Immersion wax: The automatic paper feeder will continuously send corrugated cardboard to 90qC-100′: (2 paraffin wax impregnated tanks. Immersion time is 5s to 1Os. Adjust with the amount of paperboard and the number of layers. Make the wax liquid to penetrate the corrugated board. Cardboard is degree:

(3) Thermal Bake: The corrugated cardboard removed from the wax tank removes the excess wax liquid, and then slowly moves in a hot drying chamber at 110 to 7O<0>C, further penetrating the wax liquid into the interior of the paperboard while allowing the excess wax liquid to flow away.

(4) Cooling: The dipping wax paper removed from the hot air chamber is forced to cool at room temperature to solidify the wax liquid. After the above processing, the corrugated board has good water resistance. The instrument can be used to measure its water resistance. The so-called water resistance is to put corrugated board into the water (200 (2+20 (2 tap water) 30ram, soak 1h, and then test the breakage and side pressure strength, requiring the residual strength should not be lower than the standard strength (before water immersion) of 75 %.

Water-resistant corrugated cartons are used to ship live fish, seafood, and other products with a very high moisture content. The waterproof corrugated paperboard not only has good waterproof and moisture resistance, but also has improved compressive strength. Table 1 lists the relative compressive strength properties of several types of waterproof corrugated paperboards and ordinary corrugated board under different conditions.

(B) Preservation of corrugated cardboard

The method of keeping fruits and vegetables fresh is to reduce water loss, inhibit biological respiration and bacterial growth, and remove the ethylene gas that causes them to age and ripen. Preservation of corrugated cardboard is a manual process in these areas.

1. Clip type

The plastic film soaked with the antibacterial agent and the preservative is made in the corrugated paperboard, and then the inner surface of the corrugated paper is coated with the CTM preservative. The composition is shown in Table 1. Comparison of the technology and application of pressure resistance of the waterproof corrugated paperboard Technology&Application Phytohormone Acid and its derivatives, tropolone and its derivatives (such as cerberol) and terpene ethers. This type of corrugated board prevents moisture from evaporating, maintains the freshness of the merchandise inside the box, and also regulates and controls the temperature.

2. Compound

The aluminum-coated cling film is laminated on the inner surface of the corrugated paperboard. The composite film has the function of absorbing ethylene gas. The aluminized film can prevent moisture from evaporating, and can reflect radiant heat to prevent the temperature in the box from rising and play a role in freshness preservation. .

3. Foaming type

Combine foam and corrugated. Compared with ordinary type, sandwich-type corrugated board, it has better preservation effect (see Table 2).

(1) The moisture permeability is 1/20 of an ordinary corrugated cardboard, and it is not easy to cause fruit and vegetable contraction due to moisture evaporation.

(2) Since the number of heat-conducting systems is low, the heat-resistance effect is good, and no sudden temperature fluctuations occur in the box. (3) Because of its low air permeability, it can be used to adjust the storage atmosphere. Using the above three kinds of corrugated board to make cartons, the fresh-keeping effect of cauliflower was evaluated. As a result, the oxygen content in the foam-type fresh-keeping corrugated board box gradually decreased, the CO concentration increased, and the respiration and growth of the cauliflower were suppressed; the sandwiched cardboard was used for packaging. Although cauliflower blooms due to lack of oxygen, there are pests and diseases, and there are strong offensive odors; while the atmosphere in the ordinary carton is almost the same as the atmosphere, and the cauliflower turns yellow.

4. Hybrid

In the process of manufacturing corrugated board inner paper, porous ethylene gas absorbing powder is added to prevent ripening; special ceramic powders capable of emitting infrared rays with a wavelength of 6 m to 41*m can also be coated on the raw paper, which can emit infrared rays at room temperature. Not only can the relevant molecules in the fruit be activated, it can increase the resistance to microbial attack, but it can also activate enzymes and increase the sweetness of the fruit. For peach, grape, bayberry and other fruits fresh packaging effect is good.

Variety normal 20 ~ C, 65% rh high humidity 40 ~ C. 95% rh water 100mm/h for 3h

Ordinary corrugated board l00 40 2l

Water-repellent corrugated cardboard 105 70 35

M/R corrugated cardboard ll8 89 98

Single curtain covering paperboard l06 75 56

Double-sided curtain overlays ll2 82 60

Impregnated corrugated cardboard l80 ll0 l50

Impregnation ten double-sided curtain processing

(III) Anti-static Corrugated Cardboard

Anti-static packaging for electronic components, integrated circuits and electronic engines is very important. The application of carbon powder and laminated aluminum foil on the surface of corrugated cardboard, and the addition of metal fibers or carbon fibers in the production process of boxboard can all produce anti-static corrugated cardboard. This type of carton is also used in Intercpl Max technology to provide antistatic protection for packaged items. In addition there are deodorant, non-slip and other corrugated cardboard, suitable for packaging related products.

(four) special-purpose cardboard

China's current white paperboard type is single, there is no necessary classification for distinguishing different packaging materials, and there are no specific provisions for raw materials and sanitary standards for different foods for packaging materials. However, most of the instrument packaging uses gray whiteboards. paper. At present, the cake boxes and fast food boxes on the market do not have oil resistance. After packaging oily foods, the oil seepage phenomenon is quite common. Therefore, we must develop and produce special functional paperboards for packaging solid instruments and liquid foods, as well as functional special paperboards for packing solid foods and liquid foods, and paperboard cans for packaging milk, fruit juices, etc., for different products.