JP5081468B2 - Method for producing end-sealed hollow structural plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily manufacture an edge surface sealed hollow structure plate which prevents the penetration of water or dust by sealing the edge surface of the hollow structure plate made of a thermoplastic resin and keeps the edge surface flat. <P>SOLUTION: The plane of a heat bar 22 set to a temperature capable of softening the resin is applied to the edge surface 21c of the hollow structure plate 21 to heat the edge surface 21c (a and b) and the vicinity of the edge surface 21c is softened so as to become deformable strength (b). Pressure is applied to the edge surface to compress and deform the edge surface to seal the spaces between the liners 21a exposed to the edge surface (c), the edge surface is cooled while being trimmed with a rule 23 to be flattened (d) and a built-up part produced by deformation is cut off by a cutting blade (e) to obtain the edge surface sealed hollow structure plate (f). <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an end face-sealed hollow structure board that seals an end face of a hollow structure board made of thermoplastic resin such as a plastic cardboard board to prevent water, dust, dust and the like from entering and remaining in a hollow portion.

  Plastic corrugated board made of a resin such as polypropylene is more widely used as a logistics material such as a shipping container because it is more water resistant and more durable than paper corrugated board. This plastic corrugated board is made of a thermoplastic resin in which a plurality of liners, which are plate-like parts parallel to each other, and a plurality of ribs arranged in parallel to each other are connected vertically. It is a structural board. Due to the ribs arranged in parallel, the plastic corrugated board exhibits high strength against both a force perpendicular to the liner and a force applied to an end surface parallel to the rib.

  A box using plastic corrugated cardboard having both strength and reusability is easy to reuse and wash, and is therefore easier to reuse than packaging made of paper, and its packaging applications are expanding. There are examples that are currently used for packaging not only for industrial products but also for pharmaceuticals and fresh foods. However, plastic corrugated cardboard is not hygienic when the stored items are food, medicine, etc., because the structure may cause the bream to propagate once water enters the space between the ribs. Has the disadvantages. Further, not only water but also dust and dust once entered could not be easily removed, and dirt easily adhered. For this reason, a method of sealing the end face so as to prevent water, dust, dust and the like from entering between the ribs has been studied.

  Examples of the method include the method described in Patent Document 1. This method is based on the procedure shown in FIG. First, as shown in FIG. 8A, a flat bottom 2a having a width equal to or greater than the thickness t of the plastic corrugated board 1 is provided near the end of one liner of the plastic corrugated board 1 comprising the liner 1a and the rib 1b. The heat bar 2 having The heat bar 2 is a temperature at which the material of the plastic corrugated board 1 can be softened, and the pressed plastic corrugated board 1 is compressed until the contacted portion 1c is melted and becomes flat as shown in FIG. 8B. . When the compression is completed, the heat bar 2 is released, and the flat plate-like portion 1c is bent as shown in FIGS. 8C to 8D to close the new end face 1d generated by the compression. Further, as shown in FIG. 8 (e), the portion 1 e that protrudes from the liner surface is cut out by the cutting blade 4. According to the above procedure, a plastic corrugated board whose end is closed by the compressed flat portion 1c can be obtained.

  Another method is the method described in Patent Document 2. This method is based on the procedure shown in FIG. First, as shown in FIG. 9A, near the end of one liner of the plastic corrugated board 1, the V-shaped heat bar 5 is pointed at a right angle and the cross-sectional shape of the tip is a right-angled isosceles triangle. Press to soften the resin and compress. The tip does not cut the plastic corrugated board 1, but the divided triangular prism-shaped portion 1f is thinly connected to the main body of the plastic corrugated board 1 as shown in FIG. By bending the triangular prism-shaped portion 1f from the connected portion 1g and attaching the surfaces that are in contact with the V-shaped heat bar 5, the state shown in FIG. 9C is changed to the state shown in FIG. 9D. To do. Further, a V-shaped heat bar 5 is pressed against the triangular prism portion 1h as shown in FIG. 9 (e), and is attached to a state as shown in FIG. 9 (f). By the above procedure, a plastic corrugated board whose end face is closed by a triangular prism-like portion generated by the second folding can be obtained. This method has an advantage that a pinhole leading to an internal cavity is less likely to occur than the method described in Patent Document 1 because the surfaces are joined twice.

  Still another method is the method described in Patent Document 3. This method is based on the procedure shown in FIG. That is, as shown in FIG. 10A, a wedge-shaped heat bar 6 having a thickness slightly smaller than the thickness of the plastic corrugated board is pressed from the end face side of the plastic corrugated board 1. As a result, the end face is pushed in and softened as shown in FIG. The softened portion 1i is sandwiched from above and below by the cooling bar 7 as shown in FIG. 10 (c), crushed as shown in FIGS. 10 (d) and 10 (e), and the end face is closed by this crushed and bound portion 1j. Corrugated board can be obtained. In this method, the entire end face is crushed and pressed down, so that the amount of resin that closes the end face is large and pinholes are unlikely to occur.

  On the other hand, as a hollow structure board made of thermoplastic resin, in addition to a plastic corrugated board, FIG. 3A in which a flat sheet 26a is bonded to one surface of a cap sheet 26c having a plurality of cap-shaped protrusions 26b; There is a plastic bubble board as described in (b). In such a bubble board, water, dust, and dust entering between the protrusions 26b and 26b are relatively easy to remove, but as a hollow part, the protrusion 26b is exposed at the end face and cut in half. Water, dust, and dust were likely to remain in the resulting recess 26d.

  On the contrary, there is a plastic bubble board 26 'as shown in FIGS. 3C and 3D in which a flat sheet 26a is bonded onto the protrusion 26b of the cap sheet 26c. In such a bubble board, the entire board sandwiched between the flat sheets 26c is a hollow part, and the gaps between the protrusions 26b are all connected, and when water, dust, or dust enters from the end face, it easily enters the back. As a result, dirt may not be easily removed.

  Further, even in the plastic bubble board 26 ″ as shown in FIGS. 4A and 4B in which the flat sheet 26a is bonded to both surfaces of the cap sheet 26c, the gaps between the protrusions 26b are similarly connected. Therefore, even with these foam boards, when hygiene is necessary, the end face is sealed so as not to leave a dent on the end face.

JP 2004-82428 A Japanese Patent Application Laid-Open No. 2000-177023 Japanese Patent Laid-Open No. 2003-312463

  However, in the method described in Patent Document 1, since the end face is hermetically sealed only by bending it once, a pinhole is likely to occur when the portion protruding from the liner surface is cut off. For this reason, not only water but also dust and dust once entered cannot be easily removed, but rather dirt easily adheres and becomes difficult to remove.

  Further, in the method described in Patent Document 2, the sealing performance is high by being bent twice, but the V-shaped heat bar 5 cannot be folded when the lower liner 1a is melted. Since it is necessary to accurately control the depth at which the heat bar 5 is pushed in, and high attention and accuracy are required, the work efficiency is poor.

  Furthermore, in the method described in Patent Document 3, although a high sealing performance can be realized, even if the end portion is sharply pointed instead of the surface, and it is difficult to obtain a flat end surface even if an excessive portion is scraped off. . For this reason, it was unsuitable for manufacturing a box using the obtained plastic corrugated board.

  On the other hand, plastic foam boards are generally thinner than plastic corrugated board, and it has been difficult to apply any of the sealing methods described above.

  Therefore, the present invention, when sealing the end surface of a hollow structure plate made of a thermoplastic resin having a hollow portion, such as plastic corrugated board or bubble board, while realizing high sealing, the end surface is a flat surface, and An object of the present invention is to produce an end face-sealed hollow structure plate without requiring high work accuracy.

  In the present invention, the end surface of the hollow structure plate is heated by applying a flat surface of a heat bar, which is a temperature capable of softening the resin, to soften the vicinity of the end surface to a deformable strength and to apply pressure to the end surface. By applying and compressing deformation, the hollow portion exposed at the end face is sealed, and the above-mentioned problem is solved by cutting out the raised portion caused by the deformation with a cutting blade.

  By the manufacturing method according to the present invention, the entire end portion is softened and compressed and deformed by a flat heat bar, and the softened resin of the entire end portion is pushed in. Therefore, the amount of resin related to blockage is larger than that of the conventional manufacturing method. It is possible to sufficiently close the hollow portion exposed at the end. Moreover, since a pressure is applied to the end portion, a flat end surface can be obtained, and a hollow structure plate suitable for manufacturing a box can be obtained. Furthermore, since the end portion is pressed against the heat bar to be softened, high accuracy is not required in controlling the position and width for softening and compression, and therefore, it can be easily manufactured.

  Also, if the hollow part is sealed by sealing the end face, the sealed end face resin is thick, so pinholes are less likely to occur, and water, dust, and dust are less likely to enter and remain. It becomes a hollow structure board. Moreover, since any hollow structure board does not leave a dent on the end face, the surface can be sanitary.

  The present invention will be described in detail below. The present invention is a method for producing an end face-sealed hollow structure plate made of a thermoplastic resin, having a hollow portion inside, and sealing the end surface of the hollow structure plate having the hollow portion exposed at the end surface. First, a plastic corrugated board 21 having ribs 21b between liners 21a as shown in FIG. 1A will be described as an example of the hollow structure board.

  In the embodiment shown in FIG. 1A, the plastic corrugated board 21 is cut so as to be rectangular, and the following sealing process is executed for each of the end faces corresponding to the respective sides.

  The end surface 21c is not only the cut surface on the side where the cut surfaces of the liner 21a and the rib 21b are exposed, but also the side along the rib 21b arranged in parallel, that is, the front side in FIG. It also includes a virtual plane formed by the cut surface of the liner 21a at the end on the side and the back side. The end surface of the rib 21b where the cut surface is exposed is sealed to prevent water, dust, and dust (hereinafter abbreviated as “water etc.”) from entering between the ribs 21b. be able to. Further, sealing the side along the rib 21b prevents the cut surface of the liner 21a from being exposed, and a flat flat surface can be obtained. When used in a plastic container, water or the like is unlikely to collect between the frame material. Become. For this reason, it is good to carry out for all end faces.

  In the manufacturing method according to the present invention, first, the surface of the heat bar 22 is applied to the end surface 21c of the plastic corrugated board 21 to be sealed, as in the embodiment of FIG. The heat bar 22 is an object having good heat conductivity that can sufficiently heat the plastic corrugated board 21, and needs to have a temperature at which the resin constituting the plastic corrugated board 21 can be softened. By contacting the heat bar 22 and heating the end face 21c, the resin in the vicinity of the end face 21c is softened to a deformable strength.

  As for the range of strength that can be deformed by softening as described above, the width L from the end face 21c is preferably larger than the thickness t of the plastic corrugated board. FIG. 1B shows a situation in which the softening is performed over (t + a). Since the softened portion of the resin is compressed to close the space between the liners 21a of the end face 21c, the entire end face may not be sufficiently closed unless heated over a width greater than the thickness t. On the other hand, if the width to be softened by heating too much is too wide, the area of the end face-sealed plastic corrugated board finally obtained becomes small and the production efficiency is lowered. For this reason, the width to be softened is preferably t + (3 mm) or more and t + (9 mm) or less.

  When the predetermined width L is softened from the end face as described above, the heat bar 22 is pushed toward the end, compressed and deformed, and the space between the liners 21a is pushed into the softened resin by the deformed portion 21d and sealed. At the same time, a new end face 21e is formed. This situation is shown in FIG. However, even if the heat bar 22 is deformed to form the end surface 21e and the heat bar 22 is released, the newly generated end surface 21e remains softened at a high temperature. For this reason, even if the heat bar 22 is separated from the end face 21e, the flat shape of the prepared end face 21e cannot be maintained, and unevenness is likely to occur until it is cooled to air and solidified as it is.

  Then, the heat bar 22 is separated from the plastic corrugated board 21, and the ruler 23 perpendicular to the table 25 is pressed against the hardened end surface 21e, and the resin is further pushed between the liners 21a to further improve the sealing performance. In addition to improving, the flat end surface 21f is formed and fixed by cooling with the surface flat. The situation is shown in FIG. The ruler 23 is capable of receiving heat from the plastic corrugated board 21 at least at a temperature at which the resin hardens, and has a flat plane. Before the end face 21e cooled in contact with the ruler 23 is hardened, the end face 21e is adjusted to a flat end face 21f.

  In the embodiment of FIG. 1, in order to make the flat end surface 21f perpendicular to the liner 21a, the heat bar 22 and the ruler 23 are applied perpendicularly to the liner 21a. The predetermined angle to which the ruler 23 is applied may be adjusted to the end face 21e having an angle required for the use of the end face-sealed plastic corrugated board to be manufactured. However, since the softened resin is pushed in and compressed, the deformed portion 21d rises in the vertical direction. For this reason, it is preferable that the table 25 is provided with a step as shown in FIGS. 1C and 1D so that the plastic corrugated board is not pushed up even if it rises.

  After the deformed portion 21d is cooled and solidified, the raised portion 21g, which is formed above and below the deformed portion 21d and is thicker than the thickness t of the plastic corrugated board 21, is cut out by the cutting blade 24. This situation is shown in FIG. At this time, even if the cutting blade 24 of the handheld cutter shakes, the end portion is filled with resin to the inside, so that a pinhole is not easily generated. Further, when the cut surface 21h generated by the cut is aligned with the surface of the liner 21a and cut so that it is flat, the appearance of the finally-sealed plastic corrugated board can be beautifully finished.

  By performing the above process on all the end surfaces of the plastic corrugated board 21, all end portions have flat end surfaces 21e, and pinholes that allow water or the like to enter the space between the inner liners are generated. It is possible to obtain an end face-sealed plastic corrugated board that suppresses the depression and eliminates a recess where water or the like accumulates on the end face. FIG. 1 (f) shows the appearance of the end face-sealed plastic corrugated board in this state.

  In addition, it heats only without pushing resin with the heat bar 22, presses the ruler 23 against the softened end surface 21c, compresses and deforms the resin on the end surface, seals the end surface, and forms the flat end surface 21f as a new end surface. It may be formed. However, in order to compress and deform while cooling, care must be taken so that the resin does not harden before the end face is securely sealed.

  On the other hand, the end face can be sealed even if the end face 21e is formed by compressing and deforming the resin while being heated by the heat bar 22 without using the ruler 23, and forming the end face 21e as it is. However, it takes time until the end face is cooled and fixed after the end face is formed, and the end face formed during that time may be deformed. Therefore, the end face is flattened as compared with the case of using the ruler 23 together. Becomes difficult.

  The shape of the plastic corrugated board 21 that seals the end face in the present invention is not limited to that in which the ribs 21b are arranged perpendicular to the liner 21a as shown in FIG. 1, but oblique to the liner 21a. It may be arranged, or may be a separate corrugated part joined to the liner 21a.

  Further, in place of the step of applying the ruler 23 at a predetermined angle to generate the end face 21e shown in FIG. 1C, as shown in FIG. 2A or 2B, it is oblique with respect to the liner 21a. A ruler 23 may be applied so that the end face is inclined with respect to the liner 21a.

  Further, the end surface 21c of the plastic corrugated board 21 used in the embodiment of FIG. 1 is cut perpendicularly to the liner 21a, but the plastic corrugated board has a cut surface in which the end face 21c is inclined with respect to the liner 21a. However, the present invention can be implemented.

  In addition to the plastic corrugated board described above, the hollow structure board used in the present invention includes plastic bubble boards 26, as shown in FIGS. 3 (a) to 3 (d) and FIGS. 4 (a) and 4 (b). 26 ', 26 ". First, the plastic bubble board 26 shown in cross section in FIG. 3A and in perspective view in FIG. 3B is a base of a cap sheet 26c having a plurality of cap-shaped protrusions 26b. A flat sheet 26a is bonded to one surface of the cap sheet 26. The projections 26b of the cap sheet 26c are not dense and are formed into a shape that is pushed in from the direction of the base. In the manufacturing method, for example, a melt-extruded sheet is pressed by a plurality of cylindrical protrusions from the surface to be the base, and the cap is formed. A method of forming a sheet 26c and thermally welding a flat flat sheet 26a on the base side surface, or a method of forming a cap sheet 26c having the same shape by injection molding and thermally welding the flat sheet 26a in the same manner Since one surface is open between the protrusions 26b, even if water or the like enters, the water easily evaporates and dirt and dust are easily removed, but the inside of the protrusion 26b is at the end surface. If the end face is in contact with other parts, the exposed depression 26d is likely to be contaminated with water or the like.

  3 (c) and a perspective view in FIG. 3 (d), the plastic bubble board 26 ′ is a cap sheet, contrary to the plastic bubble board 26 described in FIGS. 3 (a) and 3 (b). A flat sheet 26a is bonded to one surface of the tip 26b of the protrusion 26b of 26c. This is because the space between the base part of the cap sheet 26c and the flat sheet 26a is a hollow part, and the gaps between the protrusions 26b that are the hollow parts are connected, so that when water or the like enters from the end face, It is easy to reach and dirt cannot be removed. Further, like the bubble board 26 shown in FIGS. 3 (a) and 3 (b), a dent 26d is exposed on the end face, and water or the like remains on the end face to make it easily contaminated.

  Further, the plastic bubble board 26 ″ shown in a cross-sectional view in FIG. 4A and a perspective view in FIG. 4B is obtained by bonding flat sheets 26a to both surfaces of the cap sheet 26c. Has a higher strength than the bubble board 26 'described in FIGS. 3C and 3D, but similarly, the flat sheet 26a and the cap sheet 26c are connected to each other as a hollow portion, such as water. It is difficult to remove as well.

  As these foam boards 26, 26 ', 26 ", there is specifically a product called by the name of Papalal (registered trademark). A method for sealing the end faces of these foam boards 26, 26', 26" The same procedure as in the case of the plastic corrugated cardboard 21 can be performed.

  In the case of the bubble boards 26 and 26 'in which the flat sheet 26a is bonded to only one surface of the cap sheet 26c, the flat sheet 26a and the cap sheet 26c are melted to fill the recess 26d, and the end surface 26e is also formed in a portion without the protrusion 26b. Is formed, the end face is sealed as shown in FIGS. 5A, 5B, 5C, and 5D.

  Further, in the case of the bubble board 26 ″ in which the flat sheet 26a is bonded to both surfaces of the cap sheet 26c, the end surface 26e is formed by filling both the recess 26d and the gap between them, so that FIG. ) To prevent water and the like from entering the gap between the protrusions 26b.

  Furthermore, as the above-mentioned hollow structure board, a non-woven fabric made of thermoplastic resin is bonded to the above-mentioned plastic corrugated board or bubble board, or a foamed layer made of thermoplastic resin is laminated, or the respective plastic cardboard or foam board. What laminated | stacked each other, the thing which consists only of a layer of a foamed resin, etc. are mentioned. Also, the cap sheet of the above-mentioned bubble board is not limited to the above-mentioned shape. For example, the cap sheet is a shape in which the cap sheet is pressed so as to form protrusions from both sides, or the protrusion is an arbitrary element other than a cylinder. There is also a thing that became the form. The present invention can be applied to these hollow structural plates as long as the entire plate is made of a thermoplastic resin and has a hollow structure and is easily intruded by water, etc., and the effect of sealing the end face Can be obtained. However, it is preferable that any of the hollow structure plates have a strength that does not cause deformation due to its own weight. If it is soft enough to be deformed by its own weight, it is difficult to seal the end face, and it is difficult to use as a plate, so that it is less meaningful to seal the end face.

  Moreover, the material which comprises the hollow structure board used by this invention needs to be a thermoplastic resin, For example, polyolefin, such as a polypropylene and polyethylene, is mentioned. Among these, in particular, it is easy to manufacture if it is made of polypropylene due to the temperature required for melting.

  The end-face-sealed hollow structure plate thus obtained not only prevents the entry and remaining of water and the like by sealing the end face, but also makes the end face difficult to break by making the end face flat. Effect is obtained. In particular, the end face-sealed plastic corrugated cardboard plate 21 'is hardened by pushing a resin having a width equal to or greater than the thickness between the liners of the end parts. The part is difficult to break.

  In manufacturing a plastic container using the above-described end-face-sealed hollow structure plate, it is assembled using a general manufacturing method that fits and assembles into an assembly frame or joins the end-face-sealed hollow structure board by heat welding. Good. For example, it can be suitably used for a side plate of a plastic container as shown in FIG. In this structure, corner pillars 33 as frame members are erected at the four corners of the bottom plate 31, the end-face-sealed hollow structural plate 21 ′ as a side plate is guided by the corner pillars 33, and a lid 32 is placed thereon. FIG. 7B shows an enlarged view of a portion where the corner pillar 33 supports the end-surface-sealed hollow structure plate 21 ′ serving as a side plate. Since this side plate seals the end face 21 e, there is almost no gap between the corner pillar 33 and the concave portion of the corner pillar 33, and it is difficult for water or the like to accumulate between the corner pillar 33. Moreover, the intrusion of water or the like into the side plate itself is also prevented. For this reason, the said plastic container can be used suitably also for the packing use of a pharmaceutical and a fresh foodstuff.

  Further, not only the side plate but also the bottom plate 31 and the lid 32 may be provided with the end face sealed hollow structure plate 21 ′. If the hollow structure plate 21 whose end face is not sealed is used for these, for example, a hollow portion is exposed at the end face between the bottom plate 31 and the corner post 33, as shown in FIG. Water will enter the inside. Further, the cover 32 can be exposed in the same manner when a hollow structure plate is used. Then, as shown in FIG.7 (d), it can prevent that water etc. penetrate | invade into these by using an end surface sealing hollow structure board.

(A) Perspective perspective view of the plastic corrugated board and heat bar used in the present invention, (b) Cross-sectional view showing a state at the time of contact, (c) Cross-sectional view showing a state at the time of compression by the heat bar, (d) End face by a ruler Sectional drawing which shows the state at the time of fixing, (e) Sectional drawing which shows the state at the time of excising upper part, (f) Perspective view of the end surface sealing plastic corrugated board which finished the process (A) (b) Conceptual diagram when forming an end face by applying a ruler diagonally (A) A cross-sectional view of a bubble board in which a flat sheet is attached to the base side surface of the cap sheet used in the present invention, (b) a perspective view of (a), and (c) a flat sheet attached on the protrusion of the cap sheet Sectional view of bubble board, sectional view of (d) (c) (A) Cross-sectional view of a bubble board with flat sheets pasted on both sides of a cap sheet used in the present invention, (b) Perspective view of (a) (A) Cross-sectional view of end face-sealed bubble board with flat sheet affixed to base side, (b) Perspective view of (a), (c) Cross-section of end face-sealed bubble board with flat sheet affixed on protrusion Figures, (d) and (c) perspective views (A) Cross-sectional view of an end face-sealed bubble board with flat sheets pasted on both sides, (b) Perspective view of (a) (A) Conceptual diagram of plastic container, (b) Conceptual diagram showing how to stand the side plate of the plastic container, (c) Enlarged view of an example using a bottom plate without sealing the end face, (d) Sealing the end face Enlarged view of an example using a fixed base (A) Perspective view of the relationship between the plastic corrugated board and the heat bar in the conventional example described in Patent Document 1, (b) Cross-sectional view showing a state at the time of contact, (c) Cross-sectional view showing a state where a plate-like portion is formed (D) Sectional drawing which shows the state at the time of folding, (e) Sectional drawing which shows the state at the time of excising the protruding part (A) Perspective perspective view of the plastic corrugated board and the V-shaped heat bar in the conventional example described in Patent Document 2, (b) Cross-sectional view showing a state at the time of contact, (c) Cross-sectional view showing a state after compression deformation, (D) Cross-sectional view showing a state of being bent and contacted, (e) Cross-sectional view showing a state after compression by a second V-shaped heat bar, (f) Cross-sectional view showing a state after finishing the second bending (A) Perspective view of the relationship between the plastic corrugated board and the wedge-shaped heat bar in the conventional example described in Patent Document 3, (b) Cross-sectional view showing the state when pushed in, (c) Cross-sectional view showing the state after being pushed in, (d ) Cross-sectional view showing the state when crushed by the cooling bar, (e) Conceptual view from the end face side showing the situation when completed

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic corrugated board 1a Liner 1b Rib 1c Flat part 1d New end surface 1e The protruding part 1f Triangular prism part 1g The connected part 1h Triangular pillar part 1i The softened part 2 Heat bar 2a Bottom part 3 Unit 4 Cutting blade 5 V-shaped heat bar 6 Wedge heat bar 7 Cooling bar 21 Plastic corrugated board 21 'End face sealing plastic corrugated board 21a Liner 21b Rib 21c End face 21d Deformation part 21e End face 21f Flat end face 21g Groove upper part 21h Cutting face 22 Heat bar 23 Ruler 24 Cutting edge 25 Table 26 (Cap Bubble board 26 '(sheet attached to the side of the base of the sheet) Bubble board 26 "(sheet attached to the protrusion of the cap sheet) Bubble board 26a (sheet attached to both sides) Flat sheet 26b Protrusion 26c Cap Sheet 26 Recess 26e end surface 31 a bottom plate 32 a lid 33 corner posts

Claims (5)

The end face (21c) of a hollow structural plate made of a thermoplastic resin and having a hollow portion inside is heated by applying the surface of the heat bar (22), which is a temperature capable of softening the resin, so that the vicinity of the end face can be deformed. Soften to a strong strength,
The end surface is compressed and deformed to produce the upper Sheng pressure is applied to (21g) with respect to, sealing the hollow portion exposed to said end face, to ablate the raised portion a (21g) in the cutting edge (24) A method for producing an end-sealed hollow structural plate.   The manufacturing method of an end face-sealed hollow structure board according to claim 1, wherein a width L from an end face in a range where the softened and deformable strength is obtained is larger than a thickness t of the plastic corrugated board. .   The said hollow structure board is a plastic corrugated board (21) which provided the rib (21b) between liners (21a), The said hollow part is the space between the said liners (21a). The manufacturing method of the end surface sealing hollow structure board of description.   The hollow structural plate is a plastic bubble board (26) in which a flat sheet (26a) is bonded to at least one surface of a cap sheet (26c) having a plurality of cap-shaped protrusions (26b), and the hollow portion is The space between the protrusions (26b) of the cap sheet, and a recess (26d) inside the protrusion (26b) exposed at the end face of the cap sheet (26c). Of manufacturing the end face-sealed hollow structure plate.   The plastic container using the end surface sealing hollow structure board obtained by the manufacturing method in any one of Claims 1 thru | or 4.

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