Corrugated paperboard having a double-wall paper core

Abstract

This utility model discloses a corrugated cardboard with a double corrugated core, belonging to the field of corrugated cardboard technology; it includes a lower corrugated core, an upper corrugated core, and a face cardboard. The lower corrugated core includes a bottom cardboard, on which a honeycomb paper tube is fixed. The honeycomb paper tube is composed of alternating rows of high and low paper tubes. The upper corrugated core includes a support cardboard whose bottom surface is bonded to the top surface of the honeycomb paper tube. Square grooves are pressed at intervals on the support cardboard, which are embedded between the rows of high and low paper tubes. A concave foam body is embedded inside the square groove. The top surface of the foam body is higher than the top surface of the square groove. A corrugated core interlayer is bonded between the top surface of the support cardboard and the foam body. The corrugated cardboard with a double corrugated core of this utility model has high structural strength, the surface of the corrugated cardboard can buffer deformation, has good shock resistance, and is easy to fold and form.

Description

Technical Field

[0001] This utility model specifically relates to a corrugated cardboard with a double corrugated core, belonging to the field of corrugated cardboard technology. Background Technology

[0002] Existing corrugated paper is a sheet-like material made by bonding linerboard and corrugated paper formed by corrugating rollers. Corrugated paper is often used as a packaging material, requiring corrugated cardboard to have certain structural strength, ease of folding, and a certain degree of shock resistance. For example, Chinese Patent Publication No. CN214449233U discloses a novel double-corrugated core corrugated cardboard. Although this corrugated cardboard uses two corrugated cores to provide some shock resistance, the effect is limited, and the processing is relatively complex. For example, it requires the processing of first and second locking strips to achieve interlocking connection between the first and second locking strips. In addition, the structural strength of corrugated cardboard depends on the corrugated core. When the structural strength of the corrugated core is relatively high, it is easy for the corrugated cardboard to be unable to be folded and shaped. Therefore, there is a need to provide a corrugated cardboard that has certain structural strength, is easy to fold and shape, and has good shock resistance. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a corrugated cardboard with a double corrugated core, which has high structural strength, a surface capable of deformation buffering, good shock resistance, and is easy to fold and form.

[0004] The corrugated cardboard of this utility model with a double corrugated core includes: The lower corrugated paper core includes a bottom paperboard, on which a honeycomb paper tube is fixed. The honeycomb paper tube is composed of alternating rows of high paper tubes and low paper tubes. The honeycomb paper tube can provide structural strength for the entire corrugated paper core. By alternating rows of high and low paper tubes, the structural strength of the corrugated paper core is ensured, while the low paper tubes can be used as folding positions to facilitate the folding and forming of the corrugated paperboard. The upper corrugated paper core includes a support board with its bottom surface bonded to the top surface of a honeycomb paper tube. Square grooves are pressed at intervals on the support board, and these grooves are embedded between high and low paper tube rows. A concave foam body is embedded inside each square groove. The top surface of the foam body is higher than the top surface of the square grooves. A corrugated paper core interlayer is bonded between the top surface of the support board and the foam bodies. A cover paperboard is bonded to the top surface of the foam bodies and the paper core interlayer. The paper core interlayer and the concave foam body provide elastic cushioning support in the thickness direction of the corrugated paper core. The square grooves and concave foam body provide deformation space during the folding process of the corrugated paper core. The square grooves facilitate folding of the corrugated paper core, and the concave foam body is compressed during folding. A face sheet, which is bonded to the bottom surface of the lower corrugated core and the top surface of the upper corrugated core.

[0005] When a lower corrugated core and an upper corrugated core are used together, the corrugated cardboard can be elastically supported in the thickness direction. When the concave foam is subjected to force, it can be elastically compressed and deformed to protect the packaged goods. When the force is removed, the deformation can be restored in a short time.

[0006] Furthermore, a first foam column is embedded inside the lower paper tube row, and the top of the first foam column is lower than the top surface of the higher paper tube row. The first foam column increases the elastic deformation space between the lower corrugated paper core and the upper corrugated paper core.

[0007] Furthermore, the bottom surface of the support plate is provided with a plurality of second foam columns between the square grooves; the second foam columns are embedded in the inner side of the high paper tube row and are bonded to the top surface of the bottom plate. The first foam columns and the second foam columns cooperate to form an elastic deformation buffer space between the lower corrugated paper core and the upper corrugated paper core.

[0008] Furthermore, the paper core interlayer is a cardboard with the groove facing one side or a cardboard with the groove facing alternately on the upper and lower sides. The cardboard with the groove facing one side is made by stamping and shaping, while the cardboard with the groove facing alternately on the upper and lower sides is made by toothed roller pressing and shaping.

[0009] Furthermore, the top surface paperboard is an independent paperboard layer or a cover paperboard, and the bottom surface paperboard is an independent paperboard layer or a bottom paperboard. The bottom paperboard and cover paperboard of the double corrugated core can be directly used as the surface layer of the corrugated paperboard. The surface layer of the corrugated paperboard can also be separately bonded with the surface paperboard according to the thickness requirements.

[0010] Furthermore, the high and low paper tube rows in the same row are made of a single piece of cardboard. During processing, a square cardboard is used and punched and cut from the middle. During the cutting, protrusions and grooves are cut at intervals to form two pieces of cardboard. Then, the two pieces of cardboard are punched and shaped to form two semi-circular cavity cardboard pieces with different heights. Then, the two semi-circular cavity cardboard pieces are aligned and bonded to form a set of high and low paper tube rows.

[0011] Compared with the prior art, the corrugated cardboard with double corrugated core of this utility model has high structural strength, and two elastic buffer spaces are formed between the surface of the corrugated cardboard and the middle of the core layer, which can buffer elastic deformation; and the corrugated cardboard can be easily folded and formed according to the usage requirements. During folding and forming, the sides can be cut so that the folding position is in the concave groove position. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2This is a schematic diagram of the lower corrugated paper core structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the foam structure of this utility model.

[0015] Figure 4 This is a schematic diagram of the paper core sandwich structure of this utility model.

[0016] Figure 5 This is a schematic diagram of the first foam column installation structure of this utility model.

[0017] Figure 6 This is a schematic diagram of the second foam column installation structure of this utility model.

[0018] Reference numerals: 1. Bottom cardboard, 2. High paper tube row, 3. Low paper tube row, 4. Supporting cardboard, 5. Square groove, 6. Foam body, 7. Paper core interlayer, 8. Cover cardboard, 9. First foam column, 10. Second foam column. Detailed Implementation

[0019] Example: like Figures 1 to 4 The corrugated cardboard shown includes: The lower corrugated paper core includes a bottom paperboard 1, on which a honeycomb paper tube is fixed. The honeycomb paper tube is composed of alternating high paper tube rows 2 and low paper tube rows 3. The honeycomb paper tube can provide structural strength for the entire corrugated paper core. By alternating the high paper tube rows 2 and low paper tube rows 3, the structural strength of the corrugated paper core is ensured, while the position of the low paper tube row 3 can be used as a folding position to facilitate the folding and forming of the corrugated paperboard. The upper corrugated paper core includes a support plate 4 whose bottom surface is bonded to the top surface of the honeycomb paper tube. Square grooves 5 are pressed at intervals on the support plate 4. The square grooves 5 are embedded between the high paper tube row 2 and the low paper tube row 3. A concave foam body 6 is embedded inside the square groove 5. The top surface of the foam body 6 is higher than the top surface of the square groove 5. A corrugated paper core interlayer 7 is bonded between the top surface of the support plate 4 and the foam body 6. A cover plate 8 is bonded to the top surface of the foam body 6 and the paper core interlayer 7. The paper core interlayer 7 and the concave foam body 6 can provide elastic cushioning support in the thickness direction of the corrugated paper core. The square grooves 5 and the concave foam body 6 can provide deformation space during the folding process of the corrugated paper core. The square grooves 5 facilitate the folding of the corrugated paper core. The concave foam body 6 is compressed during folding. A face sheet, which is bonded to the bottom surface of the lower corrugated core and the top surface of the upper corrugated core.

[0020] When the lower corrugated core and the upper corrugated core are used together, the corrugated cardboard can be elastically supported in the thickness direction. When the concave foam body 6 is subjected to force, it can be elastically compressed and deformed to protect the packaged goods. When the force is removed, the deformation can be restored in a short time.

[0021] like Figure 5 As shown, a first foam column 9 is embedded inside the lower paper tube 3. The top of the first foam column 9 is lower than the top surface of the higher paper tube 2. The first foam column 9 increases the elastic deformation space between the lower corrugated paper core and the upper corrugated paper core.

[0022] like Figure 6 As shown, the bottom surface of the tray 4 is provided with a plurality of second foam columns 10 between the square grooves 5; the second foam columns 10 are embedded in the inner side of the high paper tube row 2 and are bonded to the top surface of the bottom paperboard 1. The first foam columns 9 and the second foam columns 10 cooperate to form an elastic deformation buffer space between the lower corrugated paper core and the upper corrugated paper core.

[0023] The paper core interlayer 7 is a paperboard with the groove facing one side or a paperboard with the groove facing alternately on the upper and lower sides. The paperboard with the groove facing one side is made by stamping and shaping, while the paperboard with the groove facing alternately on the upper and lower sides is made by toothed roller pressing and shaping.

[0024] The top surface paperboard is an independent paperboard layer or cover paperboard 8, and the bottom surface paperboard is an independent paperboard layer or bottom paperboard 1. The bottom paperboard 1 and cover paperboard 8 of the double corrugated core can be directly used as the surface layer of the corrugated paperboard. The surface layer of the corrugated paperboard can also be separately bonded with the surface paperboard according to the thickness requirements.

[0025] The high paper tube row 2 and low paper tube row 3 in the same row are made of a single piece of cardboard. During processing, a square cardboard is used, and it is punched and cut from the middle to form two pieces of cardboard. During the cutting, protrusions and grooves are cut at intervals along the cutting line. Then, the two pieces of cardboard are punched and shaped to form two semi-circular cavity cardboard pieces with different heights. Then, the two semi-circular cavity cardboard pieces are aligned and bonded to form a set of high paper tube row 2 and low paper tube row 3.

[0026] The above embodiments are merely preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model are included within the scope of the present utility model.

Claims

1. A corrugated cardboard with a double-walled core, characterized in that: include: The lower corrugated paper core includes a bottom paperboard, on which a honeycomb paper tube is fixed. The honeycomb paper tube is composed of alternating rows of high paper tubes and rows of low paper tubes. The upper corrugated paper core includes a support plate whose bottom surface is bonded to the top surface of a honeycomb paper tube. Square grooves are pressed at intervals on the support plate, and these grooves are embedded between high and low paper tube rows. A concave foam body is embedded inside each square groove. The top surface of the foam body is higher than the top surface of the square grooves. A corrugated paper core interlayer is bonded between the top surface of the support plate and the foam bodies. A cover plate is bonded to the top surface of the foam bodies and the paper core interlayer. A face sheet, which is bonded to the bottom surface of the lower corrugated core and the top surface of the upper corrugated core.

2. The corrugated cardboard with a double-walled core according to claim 1, characterized in that: The inner side of the lower paper tube row is embedded with a first foam column, the top of which is lower than the top surface of the higher paper tube row.

3. The corrugated cardboard with a double-walled core according to claim 1, characterized in that: The bottom surface of the tray paperboard has multiple second foam columns between the square grooves; the second foam columns are embedded inside the high paper tube row and are bonded to the top surface of the bottom paperboard.

4. The corrugated cardboard with a double-walled core according to claim 1, characterized in that: The paper core interlayer is a cardboard with the groove facing one side or a cardboard with the groove facing alternately on the top and bottom sides.

5. The corrugated cardboard with a double-walled core according to claim 1, characterized in that: The top surface paperboard is an independent paperboard layer or a cover paperboard, and the bottom surface paperboard is an independent paperboard layer or a bottom paperboard.

6. The corrugated cardboard with a double-walled core according to claim 1, characterized in that: The high and low paper tube rows in the same row are made from a single piece of cardboard.

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