TWI408085B - Packaging structure for metal material - Google Patents

Abstract

A packaging structure for packaging a metal material is disclosed. The packaging structure includes a first packaging material, and a second packaging material. The first packaging material contacts with and completely covers the metal material, wherein the linear expansion coefficient of the first packaging material is over 1%, and the capacity of the first packaging material for absorbing moisture is larger than or equals to 0. 5% of weight of the first packaging material. The second packaging material contacts with and completely covers the first packaging material, wherein the linear expansion coefficient of the second packaging material is over 10%, and the capacity of the second packaging material for absorbing moisture is smaller than or equals to 0.1% of weight of the second packaging material.

Description

Metal packaging structure

The invention relates to a packaging structure of a metal material, and particularly relates to a packaging structure of a metal material which reduces moisture entering the interior of the packaging material and can adsorb moisture in the metal interlayer, thereby preventing corrosion or oxidation of the metal material.

In the process of transporting metal materials, in order to ensure the quality of the metal material delivered to the client, it is necessary to first package the metal material to isolate the influence of external environmental factors on the metal material, thereby avoiding or reducing the occurrence of the metal material when it is delivered to the client. Such as rust or oxidation, which affects the quality of metal materials.

In the prior art, a plurality of paper sheets having a waterproof function and coated with a chemical vapor phase volatilizer [which may be called a Vapor Corrosion Inhibitor (VCI)] are usually used. Packaging materials are packaged. However, in the packaging process, it often happens that the adhesion between the plurality of paper packaging materials is poor, or the cutting edge of the metal material cuts the paper packaging material, so that the moisture in the external environment enters the interior of the packaging material, and further Causes rust or oxidation defects in the metal.

Therefore, there is a need for a new type of metal material packaging structure to overcome the above disadvantages.

Accordingly, it is an object of the present invention to provide a packaging structure for a metal material which utilizes an inner layer packaging material having a better water absorption property to adsorb moisture in the metal material interlayer. In addition, the use of a larger linear elongation of the outer packaging material to reduce the chance of the sharp cutting edge of the metal cutting the packaging material, thereby preventing moisture from entering the interior of the packaging material. Therefore, the above-mentioned inner and outer packaging materials can reduce the probability of occurrence of defects such as rust or oxidation of the packaged metal material.

According to an embodiment of the present invention, a packaging structure of a metal material is provided, wherein the packaging structure of the metal material is used to package a metal material. The packaging structure of the metal material comprises a first packaging material and a second packaging material. The first packaging material is in contact with the metal material and completely covers the metal material, wherein the linear elongation of the first packaging material is greater than 1%, and the weight of the first packaging material absorbable moisture is greater than or equal to the weight of the first packaging material. 0.5%. The second packaging material is in contact with the first packaging material and completely covers the first packaging material, wherein the linear elongation of the second packaging material is greater than 10%, and the weight of the second packaging material capable of absorbing moisture is less than or equal to the second 0.1% of the weight of the packaging material itself.

According to another embodiment of the present invention, in the above packaging structure of the metal material, the first packaging material has a wrinkled pattern.

According to still another embodiment of the present invention, in the packaging structure of the metal material, the second packaging material is a porous tissue material and has a function of venting water to thereby make water vapor coated in the second packaging material. The molecules are able to evaporate out of the second package and prevent water molecules outside the second package from entering the second package.

According to still another embodiment of the present invention, in the packaging structure of the metal material, the first packaging material is elongated, and the first packaging material is divided into a plurality of sections, wherein each section has an adjacent first The side edge is joined to the second side edge, the first side edge being joined to the other of the segments. In addition, each segment has an area adjacent to the second side, the area being covered by the other of the adjacent segments, such that the first packaging material is wrapped in a winding manner. Metal.

According to still another embodiment of the present invention, in the packaging structure of the metal material, the second packaging material is elongated, and the second packaging material is divided into a plurality of sections, wherein each section has an adjacent first The side edge is joined to the second side edge, the first side edge being joined to the other of the segments. In addition, each of the segments has a region adjacent to the second side, the region being covered by the other one of the segments, such that the second package is wrapped in the winding manner. A packaging material.

The invention has the advantages that the metal material is coated by the inner and outer packaging materials with different linear elongation and water absorption, thereby effectively reducing the probability of reducing rust or oxidation defects of the packaged metal material, thereby improving the delivery client. The quality of the metal and improve the utilization of the metal.

Please refer to FIGS. 1A to 2E , wherein FIGS. 1A to 1E are schematic plan views showing various stages in a process of coating a metal material with a packaging material according to an embodiment of the present invention, and FIG. 1F is a schematic view along the first 1E-1F is a schematic cross-sectional view of a dicing line 1F-1F cut, and FIG. 2 is a cross-sectional view showing a packaging structure 100 of a metal material coated according to the coating method shown in FIGS. 1A to 1F. According to the structure shown in FIG. 2, the packaging structure 100 of the metal material is used to coat the metal material 102, wherein the packaging structure 100 of the metal material comprises the first packaging material 104 and the second packaging material 106.

As shown in FIG. 1A, the metal material 102 is first placed on the first packaging material 104. Next, as shown in FIG. 1B, one of the first packaging materials 104 is partially folded to cover a portion of the metal material 102. The other portion opposite to the above portion of the first packaging material 104 is then folded, thereby completely covering the metal material 102, thereby forming a structure as shown in Fig. 1C. In addition, the two portions of the first packaging material 104 are bonded by the tape 108. However, in other embodiments, the two portions of the first packaging material 104 may also be bonded using other means such as glue. Next, the left and right ends of the first packaging material 104 in the first drawing are folded in the direction indicated by the arrow in Fig. 1D. Finally, the left and right ends of the first packaging member 104 are bonded by the tape 108 to form a structure as shown in Fig. 1E.

After completing the coating as described above, the first packaging material 104 is in contact with the metal material 102, and the first packaging material 104 completely covers the metal material 102. In addition, the linear elongation of the first packaging material 104 is greater than 1%, that is, when the first packaging material 104 is stretched in a specific direction, the length after stretching is deducted from the original length, and the original length is required. 1% or more of the value. Furthermore, in order to effectively absorb the moisture attached to the metal material 102, the weight of the first packaging material 104 that can absorb moisture (which may be referred to as absorption rate) is greater than or equal to 0.5% of the weight of the first packaging material 104 itself. .

After the first packaging material 104 is coated on the metal material 102, the second packaging material 106 (see FIG. 2) is further carried out in the manner of coating as described above (corresponding to the coating method of FIGS. 1A to 1E). The coating is applied to wrap the second packaging material 106 over the first packaging material 104. As shown in FIG. 2, the second packaging material 106 is in contact with the first packaging material 104, and the second packaging material 106 completely covers the first packaging material 104.

After observing, the applicant found that the sharp cutting edge of the metal material is easy to cut the packaging material, the main reason is that the elongation of the packaging material is insufficient. According to the above, in order to prevent the sharp cutting edge of the metal material 102 from cutting the first packaging material 104 and then cutting the second packaging material 106, the linear elongation of the second packaging material 106 needs to be greater than 10%. In addition, in order to prevent the moisture contained in the external environment from entering the second packaging material 106, thereby causing the metal material 102 to be rusted or oxidized, the weight of the second packaging material 106 capable of absorbing moisture needs to be less than or equal to the second packaging. The material 106 itself is 0.1% by weight. In a particular embodiment, the second wrapper 106 can be, for example, a PE film having excellent extensibility.

Please refer to FIG. 3, which is a partial cross-sectional view showing a packaging structure of a metal material according to another embodiment of the present invention. In the present embodiment, the packaging structure 100a of the metal material is similar to the packaging structure 100 of the metal material shown in FIGS. 1A to 1F, so the following only the difference between the packaging structure 100a of the metal material and the packaging structure 100 of the metal material. Partially explained, the same part will not be described again. In the metal packaging structure 100a, the first packaging material 104a and the second packaging material 106 are included, wherein the first packaging material 104a has a wrinkle pattern as shown in FIG. The first wrapper 104a has a wrinkle pattern to provide a cushioning function of the metal material 102 to avoid slight distortion caused by the inadvertent slight impact on the metal material 102. In a particular embodiment, the metal material 102 having a corrugated configuration can be crepe paper.

In an embodiment, the first packaging material in the packaging structure of the metal material may be a fiber braid. In yet another embodiment, the first packaging material in the packaging structure of the metal material can be a porous tissue material.

In addition, in a specific embodiment, in order to more effectively remove moisture adhering to the metal sheet during the coating process, and at the same time effectively preventing moisture of the external environment from entering the packaging material, the second package in the packaging structure of the metal material The material is a porous tissue material and has the function of venting water. The venting function of the second packaging material enables the water vapor molecules wrapped in the second packaging material to evaporate outside the second packaging material, and the water repellency function of the second packaging material prevents the second packaging material from being The outer water molecules enter the packaging material.

In a particular embodiment, the first packaging material or the second packaging material is further coated with a rust inhibitor in order to more effectively prevent rust or oxidation of the metal sheet from moisture adhering to the metal sheet during the coating process. In yet another embodiment, the rust inhibitor is a VCI.

Please refer to FIGS. 4A and 4B , which are respectively a top plan view of a metal material wrapped by a winding method and a top view of a first packaging material of FIG. 4A after being unfolded according to another embodiment of the present invention. In this embodiment, for the sake of clarity of the drawings, only the metal plate 102 and the first packaging material 104b in the packaging structure of the metal material are shown in FIG. 4A, and the second packaging material is not shown. In it. Those skilled in the art will readily appreciate how the second package can be wrapped over the first package 104b in the same manner, with reference to the following description. As shown in FIG. 4B, the first packaging material 104b is elongated, and the first packaging material 104b is divided into a plurality of sections 110, wherein each section 110 has an adjacent first side 110a and a second side. The side 110b is joined to the other of the plurality of sections 110 adjacent to the side 110b.

In addition, each segment 110 further has a region 110c adjacent to the second side 110b. When the first packaging material 104b covers the metal plate 102 in a structure as shown in FIG. 4A, the region 110c of each segment 110 is covered by the other of the plurality of segments 110, That is, the first packaging material 104b is wrapped with the metal material 102 in a winding manner.

After the first packaging material 104b is wrapped in the above-described metal material 102 in a winding manner as described above, the second packaging material (not shown) is then coated on the first packaging material 104b in the same manner.

In a particular embodiment, the metal material in the embodiments described above may be a steel coil produced by a steel mill [see Annexes 4(a) and (b)].

The invention is more specifically described in the following examples, but the scope of the invention is not limited by the examples.

Example 1

First, take three pieces of cold-rolled sheet with a thickness of 0.5 cm and a length and width of 10 cm and 5 cm, respectively, and dip the cold-rolled sheet with an alkaline cleaner at a temperature of 90 ± 5 ° C (ie, cold) The rolled sheet is degreased). Next, it is washed with tap water and deionized water, and finally blown dry with an air gun.

Next, the above three cold-rolled sheets are stacked together, and the crepe paper (linear elongation: 5 to 8%, water absorption is substantially 40%) is coated with the cold-rolled sheet in the winding manner shown in the above-mentioned 4A and 4B. . After the wrinkle paper is coated, the PE film (linear elongation 200-240%, water absorption substantially less than 0.01%) is coated on the crepe paper in the same manner.

The coated cold rolled sheet is then sent to the laboratory for experimentation. In the laboratory, the changes in temperature and humidity are shown in Figure 5. The cold-rolled sheets which were coated were continuously tested in a cycle of 24 hours, and were taken out on the 7th, 14th, 21st, 30th, 40th, 50th and 60th days to record the corrosion.

After a test of 60 cycles (60 days) in accordance with the change in temperature and humidity shown in Fig. 5, the cold-rolled sheet was taken out from the packaging material, and the condition was examined. As shown in Annexes 1 (a) to (d), it can be seen from Annex 1 (a) that there is no damage to the packaging material. When the packaging material was removed [Annex 1 (b)], it was examined whether or not moisture intruded into the packaging material, and no moisture intrusion was found. Next, the corrosion of the cold-rolled sheet is examined. As shown in Annex 1 (c), there is no rust point on the inner layer and the surface is smooth. In addition, as shown in Annex 1 (d), the outer layer is also free of rust and has a smooth surface.

Example 2

The experimental conditions of Example 2 were all identical to Example 1 except that the coating method was different from that of Example 1, in which Example 2 was coated with a cold-rolled sheet in the manner shown in Figures 1A and 1E.

It was found after the experiment that the coating method of Example 2 can be carried out by 20 cycles of the temperature and humidity changes shown in Fig. 5 without causing rust spots on the cold rolled sheet. After 20 cycles of testing, the cold rolled sheet was taken out of the package and its condition was examined. As shown in Annexes 2(a) to (d), it can be seen from Annex 2(b) that the crepe paper is not permeable to water. When the packaging material was removed [Annex 2 (c)], it was examined whether or not moisture intruded into the packaging material, and no moisture intrusion was found. Next, the rust condition of the cold-rolled sheet is examined. As shown in Annex 2 (d), the outer layer has no rust point and the surface is smooth.

Comparative example 1

The experimental conditions of Comparative Example 1 were all identical to those of Example 2 except that the packaging material was different from the packaging material of Example 2, in which Comparative Example 1 was coated with cold-rolled kraft paper having reinforced knit on the surface and coated with VCI. board.

After the experiment, it was found that the cold-rolled sheet of Comparative Example 1 began to be rusted after 7 cycles of the temperature and humidity change shown in Fig. 5. After 7 cycles of testing, the cold rolled sheet was taken out of the package and its condition was examined. As shown in Annexes 3(a) to (c), it can be seen from Annex 3(a) that a large range of fine rust spots are produced in the sandwich of the three cold rolled sheets. According to the attachment 3(b), in the range of 0.5 cm to 1 cm from the edge of the cold-rolled sheet, since the VCI is volatilized on the kraft paper and covered thereon, no rust point is generated. Further, according to the attachment 3(c), the portion of the cold-rolled sheet that is in contact with the VCI-coated kraft paper has no rust point at all.

Comparative example 2

The experimental conditions of Comparative Example 2 were all identical to Comparative Example 1 except that the treatment of the cold-rolled sheet was different from that of Comparative Example 1, in which the cold-rolled sheet of Comparative Example 2 was cut from a steel coil to a desired size. The surface particles are blown off with an air gun (that is, the grease on the steel coil is retained, so it can be called oiling treatment), and then coated with a packaging material.

After the experiment, it was found that the cold-rolled sheet of Comparative Example 2 began to be rusted after undergoing 30 cycles of the temperature and humidity change shown in Fig. 5.

Compared with Comparative Example 1, since the cold-rolled sheet of Comparative Example 2 has grease, it is possible to delay the time at which the rust point is generated.

Comparative example 3

The experimental conditions of Comparative Example 3 were all identical to those of Example 2 except that the packaging material was different from the packaging material of Example 2, wherein Comparative Example 3 was only coated with a PE film to coat the cold rolled sheet.

After the experiment, it was found that the cold-rolled sheet of Comparative Example 3 began to be rusted after 7 cycles of the temperature and humidity change shown in Fig. 5.

Compared with Example 2, since the cold-rolled sheet of Comparative Example 3 lacked the coating of the crepe paper, the rust point was generated relatively quickly.

Comparative example 4

The experimental conditions of Comparative Example 4 were all identical to Comparative Example 3 except that the treatment of the cold-rolled sheet was different from that of Comparative Example 3, wherein the cold-rolled sheet of Comparative Example 4 was an alkaline cleaner at 90 ± 5 ° C. The cold rolled sheet is dipped at a temperature. Next, it is washed with tap water and deionized water, and then blown dry with an air gun. Finally, the cold-rolled sheet was placed in an oven at 110 ° C for three hours to dry and remove moisture (i.e., the cold-rolled sheet was subjected to the degreasing treatment of the above Example 1 and hot air drying treatment).

After the experiment, it was found that the cold-rolled sheet of Comparative Example 4 began to cause rusting after 21 cycles of the temperature and humidity change shown in Fig. 5.

Compared with Comparative Example 3, since the cold-rolled sheet of Comparative Example 4 was subjected to the operation of drying and removing moisture, the time at which the rust point was generated can be delayed.

Comparative Example 5

The experimental conditions of Comparative Example 5 were all identical to Comparative Example 4 except that the coating method was different from that of Comparative Example 4, wherein Comparative Example 5 was wrapped in a PE film in accordance with the winding method shown in Figs. 4A and 4B. Covered on cold rolled sheets.

After the experiment, it was found that the cold-rolled sheet of Comparative Example 5 began to be rusted after undergoing 30 cycles of the temperature and humidity change shown in Fig. 5.

Compared with Comparative Example 4, since the coating method (winding method) of Comparative Example 5 can provide better airtightness, it is possible to delay the time at which the rust point is generated.

Comparative Example 6

The experimental conditions of Comparative Example 6 were all identical to Comparative Example 4 except that the treatment of the cold-rolled sheet was different from that of Comparative Example 4, in which the cold-rolled sheet of Comparative Example 6 was cut from a steel coil to a desired size. The surface particles are blown off with an air gun, and then coated with a packaging material.

After the experiment, it was found that the cold-rolled sheet of Comparative Example 6 began to be rusted after 21 cycles of the temperature and humidity change shown in Fig. 5.

In Comparative Example 4, the cold-rolled sheet had grease, and in Comparative Example 6, although the cold-rolled sheet was not provided with grease, the cold-rolled sheet of Comparative Example 6 was dried to remove moisture, so Comparative Example 4 was the same as the time at which the cold-rolled sheet of Comparative Example 6 produced a rust point.

The following Table 1 is a graph showing the packaging method, the packaging material, the cold-rolled sheet processing method, and the time at which the rusting point is started (circulation days) in the above-described Example 1, Example 2, and Comparative Examples 1 to 6.

It can be seen from Comparative Example 1 and Example 2 of Table 1 above that the non-stretch kraft paper is replaced by crepe paper, and the cold-rolled sheet is degreased (without oiling protection), and can be maintained for 20 days without life. rust. According to the first embodiment of Table 1, it can be seen that if the coating method of the second embodiment is changed to the winding method of the first embodiment, the number of days without rust can be greatly increased to 60 days.

Further, the tests of Example 3 and Comparative Example 7 below were carried out.

Example 3

The experimental conditions of Example 3 are all the same as those of Example 1 except that the metal materials to be coated are different and the treatment of the metal materials is different. The metal material of Example 3 is a steel coil directly crepe paper and PE. The film is coated (keeping the oil on the surface of the coil). The above-mentioned coil coating step is as shown in Annexes 4(a) to (d).

After 20 cycles of testing, the steel coil was taken out of the packaging and its condition was examined [as shown in Annexes 5(a) to (h)]. Annex 5 (a) and (b) are external diagrams of steel coils. As can be seen from Annex 5 (c), the first layer after unwinding of the coil has a slight rust condition. According to Annex 5(d), the crepe paper remains dry without wetting. After unwinding the coil, it can be found that the inner layer has almost no rust spots [Annex 5(e) to (g)]. In addition, according to Annex 5(h), the side of the coil remains rust-free.

Comparative Example 7

The experimental conditions of Comparative Example 7 were all identical to Example 3 except that the packaging material was different from the packaging material of Example 3, wherein Comparative Example 7 was coated with a kraft paper having a reinforced knit and coated with VCI. .

After 20 cycles of testing, the steel coil was taken out of the packaging and its condition was examined [as shown in Annexes 6(a) to (h)]. Annex 6 (a) to (c) are external diagrams of steel coils. As can be seen from Annex 6(d), the first layer after unwinding of the coil has rust. According to Annex 6(d), the crepe paper remains dry without wetting. After unwinding the coil, it can be found that there are many rust spots of different sizes in the inner layer [Annex 6(e) to (g)]. In addition, according to Annex 6 (h), the surface of the deep steel plate of the steel coil is good, but some of its side is rusted.

In summary, according to the packaging structure of the metal material of the present invention, the coated metal material can be significantly deteriorated by being wetted and rusted or oxidized.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100. . . Metal packaging structure

100a. . . Metal packaging structure

102. . . Metal

104. . . First packaging material

104a. . . First packaging material

104b. . . First packaging material

106. . . Second packaging material

108. . . tape

110. . . Section

110a. . . First side

110b. . . Second side

110c. . . region

1F-1F. . . secant

For a better understanding of the present invention, reference is made to the above detailed description and the accompanying drawings. It is emphasized that, in accordance with the standard of the industry, the various features in the drawings are not to scale. In fact, the dimensions of the various features may be arbitrarily enlarged or reduced in order to clearly illustrate the above embodiments. The relevant schema description is as follows.

1A to 1E are schematic plan views showing various stages in a process of coating a metal material with a packaging material according to an embodiment of the present invention.

Fig. 1F is a schematic cross-sectional view taken along the secant line 1F-1F in Fig. 1E.

Fig. 2 is a schematic cross-sectional view showing a packaging structure of a metal material coated according to the coating method shown in Figs. 1A to 1F.

Figure 3 is a partial cross-sectional view showing the packaging structure of a metal material according to another embodiment of the present invention.

4A is a top plan view showing a metal material wrapped in a winding manner according to another embodiment of the present invention.

FIG. 4B is a schematic plan view showing the first packaging material in FIG. 4A after being unfolded.

Figure 5 is a graph showing temperature versus humidity as a function of time for a coated metal.

Attachment 1 (a) to (d) show the case of the packaging material and the cold-rolled sheet in Example 1.

Attachment 2 (a) to (d) show the case of the packaging material and the cold rolled sheet in Example 2.

Attachments 3(a) to (c) show the case of the packaging material and the cold-rolled sheet in Comparative Example 1.

Attachment 4 (a) to (d) illustrate the steel coil coating step in Example 3.

Attachment 5(a) to (h) show the case of the packaging material and the steel coil in the embodiment 3.

Attachment 6(a) to (h) show the case of the packaging material and the steel coil in Comparative Example 7.

100. . . Metal packaging structure

102. . . Metal

104. . . First packaging material

106. . . Second packaging material

108. . . tape

Claims (10)

a packaging structure of a metal material for packaging a metal material, wherein the packaging structure of the metal material comprises: a first packaging material, wherein the first packaging material contacts the metal material and completely covers the metal material, the first The linear elongation of a packaging material is greater than 1%, and the weight of the first packaging material absorbs moisture is greater than or equal to 0.5% of the weight of the first packaging material; and a second packaging material, wherein the second packaging The material is in contact with the first packaging material and completely covers the first packaging material, the linear elongation of the second packaging material is greater than 10%, and the weight of the second packaging material absorbable moisture is less than or equal to the second 0.1% of the weight of the packaging material itself. The packaging structure of the metal material according to claim 1, wherein the first packaging material has a wrinkled pattern. The packaging structure of the metal material according to claim 2, wherein the first packaging material is a crepe paper. The packaging structure of the metal material according to claim 1, wherein the first packaging material is selected from the group consisting of a fiber woven fabric and a porous tissue material. The packaging structure of the metal material according to claim 1, wherein the first packaging material or the second packaging material is further coated with a rust inhibitor. The packaging structure of the metal material according to claim 1, wherein the rust inhibitor is a gas phase rust inhibitor. The packaging structure of the metal material according to claim 1, wherein the second packaging material is a porous tissue material and has a function of venting water, so that water vapor molecules coated in the second packaging material can Evaporating to the outside of the second packaging material and preventing water molecules other than the second packaging material from entering the second packaging material. The packaging structure of the metal material according to claim 1, wherein the first packaging material is elongated, and the first packaging material is divided into a plurality of sections, wherein each of the sections has an adjacent one a side edge and a second side edge, the first side edge being joined to the other one of the plurality of segments; wherein each of the segments has an area adjacent to the second side edge, The zone is covered by the other of the segments adjacent to the segment such that the first package material wraps the metal material in a wound manner. The packaging structure of the metal material according to claim 1, wherein the second packaging material is elongated, and the second packaging material is divided into a plurality of sections, wherein each of the sections has an adjacent one a side edge and a second side edge, the first side edge being adjacently joined to the other of the plurality of segments; wherein each of the segments has an area adjacent to the second side edge, The area is covered by the other of the sections adjacent to the other such that the second package wraps the first package in a wound manner. The packaging structure of the metal material according to claim 1, wherein the metal material is a steel coil.