KR-20260062421-A - Double core corrugated cardboard sheet with high strength, manufacturing apparatus and manufacturing method thereof

KR20260062421AKR 20260062421 AKR20260062421 AKR 20260062421AKR-20260062421-A

Abstract

A manufacturing apparatus for a high-strength double-core corrugated cardboard sheet according to the present invention comprises: a first supply device for supplying a first corrugated core sheet and a first surface liner from one side; a second supply device for supplying a second corrugated core sheet and a second surface liner from the other side; a first roller and a second roller configured to heat-press the first corrugated core sheet supplied so that crests and valleys are formed at regular intervals and curves are formed on the first corrugated core sheet; a first heat-pressing unit configured to bond the first corrugated core sheet with crests and valleys formed thereon and the first surface liner supplied thereon to form a first single-sided corrugated cardboard; a third roller and a fourth roller configured to heat-press the second corrugated core sheet supplied thereon so that crests and valleys are formed at regular intervals and curves are formed thereon; and a second heat-pressing unit configured to bond the second corrugated core sheet with crests and valleys formed thereon and the second surface liner supplied thereon to form a second single-sided corrugated cardboard. and is configured to include a thermal bonding section in which the ridges and valleys of the first single-sided corrugated cardboard and the second single-sided corrugated cardboard face each other, and the valley on one side is inserted and fitted into the ridge on the other side so as to be thermally bonded on the inclined surface of the corresponding ridges and valleys.

Inventors

박용임

Assignees

주식회사 지라인

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (12)

As a manufacturing device for high-strength double-core corrugated cardboard sheets, A first supply device for supplying a first core sheet and a first surface liner from one side, wherein at least one side of the first core sheet and/or the first surface liner is coated with a heat bonding material; A second supply device that supplies a second core sheet and a second surface liner from the other side, wherein at least one side of the second core sheet and/or the second surface liner is coated with a heat bonding material; A first roller and a second roller configured to rotate by interlocking with each other, wherein the first roller and the second roller are configured to heat-press the first corrugated core supplied thereto so that the peaks and valleys are formed at regular intervals and curved. A first heat pressing part configured to form a first single-sided corrugated board by joining the first corrugated core sheet having the above-mentioned peaks and valleys and the supplied first surface liner together; A third roller and a fourth roller configured to rotate by interlocking with each other, wherein the third roller and the fourth roller are configured to heat-press the supplied second corrugated core so that the peaks and valleys are formed at regular intervals and folded. A second heat pressing unit configured to form a second single-sided corrugated board by joining the second corrugated core sheet having the above-mentioned peaks and valleys and the supplied second surface liner together; and A thermal bonding part in which the ridges and ridges of the first single-sided corrugated cardboard and the second single-sided corrugated cardboard face each other, and the ridge on one side is inserted and fitted into the ridge on the other side so as to be thermally bonded on the inclined surface of the corresponding ridge and ridge; A manufacturing apparatus for high-strength double-core corrugated cardboard sheets characterized by including
A manufacturing apparatus for high-strength double-core corrugated cardboard sheets according to claim 1, characterized in that the manufacturing apparatus is capable of producing double-core corrugated cardboard sheets at a single station without a separate adhesive application device and adhesive drying device.
An apparatus for manufacturing a high-strength double-core corrugated cardboard sheet, characterized in that, in claim 1, the first heat pressing part and the second heat pressing part simultaneously perform the function of the heat bonding part, the first heat pressing part and the second heat pressing part are arranged adjacent to each other, and heat bond the ridges and ridges of the first single-sided corrugated cardboard and the second single-sided corrugated cardboard facing each other while applying corresponding pressure to form a double-core corrugated cardboard.
A manufacturing apparatus for a high-strength double-core corrugated cardboard sheet according to claim 1, wherein the first heat pressing part and the second heat pressing part are composed of a heat pressing roller or a heat pressing belt.
A manufacturing apparatus for a high-strength double-core corrugated cardboard sheet, characterized in that, in claim 1, it further comprises a guide portion disposed adjacent to the first heat pressing portion and the second heat pressing portion to guide the double-core corrugated cardboard toward the discharge port.
A manufacturing apparatus for a high-strength double-core corrugated sheet, wherein, in claim 1, the heat-bonding material pre-coated on both sides of the first corrugated core, the first surface liner, the second corrugated core, and the second surface liner additionally has an air-blocking function, a waterproof function, and a heat-blocking function in addition to the heat-bonding function.
A manufacturing apparatus for a high-strength double-core corrugated cardboard sheet, characterized in that, in claim 1, the upper width of the peak is configured to be greater than the lower width of the valley, thereby forming a cavity between corresponding peaks and valleys.
As a method for manufacturing a high-strength double-core corrugated cardboard sheet, A step of coating a heat bonding material on at least one surface of the first corrugated core, the first surface liner, and the second corrugated core and the second surface liner; A step of supplying the first corrugated core and the first surface liner from one side; A step of supplying the second corrugated core and the second surface liner from the other side; A step of applying heat and applying pressure to the heat-bonding material coated on the first corrugated core supplied above, thereby forming peaks and valleys at regular intervals on the first corrugated core; A step of forming a first single-sided corrugated cardboard by joining the first corrugated core sheet having the above-mentioned peaks and valleys and the first surface liner supplied thereto together; A step of applying heat and applying pressure to the heat-bonding material coated on the supplied second corrugated core to form peaks and valleys at regular intervals on the second corrugated core; A step of forming a second single-sided corrugated cardboard by joining the second corrugated core sheet having the above-mentioned peaks and valleys and the supplied second surface liner together; and A step of inserting and fitting the ridges and valleys of the first single-sided corrugated cardboard so as to correspond to the valleys and ridges of the second single-sided corrugated cardboard, respectively, and heat-bonding them on the inclined surfaces of the corresponding ridges and valleys; A method for manufacturing a high-strength double-core corrugated cardboard sheet characterized by including
A method for manufacturing a high-strength double-core corrugated cardboard sheet, characterized in that, in claim 8, the upper width of the mountain is configured to be larger than the lower width of the valley, thereby forming a predetermined space between corresponding mountains and valleys.
A high-strength double-core corrugated cardboard sheet composed of four sheets of paper laminated together, Two sheets of paper located on the outer surface of the above-mentioned high-strength double-core corrugated cardboard sheet each form a first surface liner and a second surface liner made of flat surfaces, and The two sheets of paper located on the inner surface of the above-mentioned high-strength double-core corrugated cardboard sheet form a first corrugated core sheet that is curved in a straight shape so that ridges and valleys are wrinkled at regular intervals, and a second corrugated core sheet that is curved in a straight shape so that ridges and valleys are wrinkled at regular intervals. A high-strength double-core corrugated cardboard sheet characterized in that the first corrugated core and the second corrugated core are inserted and fitted such that the peaks and valleys of the first corrugated core correspond to the valleys and peaks of the second corrugated core, respectively, and are thermally bonded at the inclined surfaces of the corresponding peaks and valleys, thereby interconnecting the peaks of the first corrugated core, the thermally bonded inclined surfaces, and the peaks of the second corrugated core to form a continuous corrugated structure inside the corrugated cardboard sheet.
A high-strength double-core corrugated sheet according to claim 10, characterized in that the upper width of the mountain is configured to be greater than the lower width of the valley, thereby forming a cavity between corresponding mountain and valley.
A high-strength double-core corrugated cardboard sheet according to claim 10, characterized in that the height of the inclined surface where the corresponding peaks and valleys are joined is 30% to 70% of the valley depth on one side or the peak height on the other side of the double-core corrugated cardboard.

Description

High-strength double-core corrugated cardboard sheet, manufacturing apparatus and manufacturing method thereof The present invention relates to a high-strength double-core corrugated cardboard sheet that can be manufactured at a single station without a separate adhesive application device and adhesive drying device, and furthermore, the corrugated cardboard sheet itself has cushioning, waterproofing, and cooling functions, as well as a manufacturing device and a manufacturing method thereof. Generally, conventional packaging boxes have been made of double-sided corrugated cardboard to facilitate the storage and transportation of goods. Generally, corrugated cardboard is broadly classified into single-sided corrugated cardboard (i.e., composed of two sheets of base paper) in which a surface liner is bonded to one side of a corrugated core paper having ridges and corrugations formed thereon, double-sided corrugated cardboard (i.e., composed of three sheets of base paper) in which a surface liner is additionally bonded to the other side of the single-sided corrugated cardboard, and double-sided corrugated cardboard (i.e., composed of five sheets of base paper) in which the single-sided corrugated cardboard is additionally bonded to one side of the double-sided corrugated cardboard. A conventional method for manufacturing double-sided corrugated cardboard, as illustrated in FIG. 1(a), involves a pair of interlocking rollers (2a, 2b) rotating together to form ridges and valleys on a supplied corrugated core sheet (1). Next, a first adhesive application roller (4a) applies adhesive to the ridges formed on one side of the corrugated core sheet (1). Then, a pressure belt (6) rotating through a pair of rollers (6a, 6b) presses an additionally supplied surface liner (1') against one side of the corrugated core sheet (1) to which the adhesive has been applied, thereby manufacturing a single-sided corrugated cardboard (1a) [single facer]. As shown in FIG. 1(b), the above single-sided corrugated cardboard (1a) is supplied continuously again, and the second adhesive application roll (4b) applies adhesive again to the ridge formed on the other side of the single-sided corrugated cardboard (1a). Then, the heat-tightening part (8) heat-presses the additionally supplied surface liner (1'') onto the other side of the corrugated core sheet to which the adhesive has been applied, thereby finally manufacturing a double-sided corrugated cardboard (1b) [double facer]. As such, conventional methods for manufacturing double-sided corrugated cardboard must include single facers and double facers that are carried out continuously in separate spaces and facilities, which requires a large installation space for the device. Additionally, there were problems that increased device costs and reduced work efficiency due to the adhesive application and adhesive drying processes required for each single facer and double facer. Meanwhile, Korean Registered Patent No. 10-0181564 (hereinafter referred to as the prior art) discloses a method for forming a double-core corrugated cardboard, which comprises the steps of: continuously supplying a first corrugated cardboard and a first surface liner to a first stacking station, then continuously forming the first corrugated cardboard to have predetermined peaks and valleys while applying an adhesive to the peaks of the first corrugated cardboard, and stacking a first surface liner on the formed first corrugated cardboard to form a single-sided corrugated cardboard; continuously supplying the single-sided corrugated cardboard and a second corrugated cardboard to a second stacking station, then continuously forming the second corrugated cardboard to have predetermined peaks and valleys while applying an adhesive to the peaks of the second corrugated cardboard, and stacking the formed second corrugated cardboard on the single-sided corrugated cardboard to form a double-core corrugated cardboard; and continuously supplying the double-core corrugated cardboard and a second surface liner to a third stacking station, then continuously stacking a second surface liner on the double-core corrugated cardboard to form a double-core corrugated cardboard. However, the above-mentioned conventional technology consists of a process in which a first corrugated core, a first surface liner, a second corrugated core, and a second surface liner are likewise supplied continuously to first, second, and third lamination stations, and sequentially laminated and dried through the application of adhesive. Therefore, the conventional technology necessarily requires an adhesive application device and a drying device (e.g., a heating plate, etc.), and the manufacturing efficiency is reduced due to the adhesive application and drying processes, the overall corrugated cardboard manufacturing facility becomes very complex, and the installation equipment is arranged continuously, requiring a considerably large installation space. Furth