JP2007106065A - Sealing method for composite plate material end section, and composite plate material formed by the method, and box-like body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a resin amount on the external edge end section of a composite plate material which is formed by integrally laminating a corrugated board made of a synthetic resin having a hollow structure, and to facilitate a heat-weld-sealing process of the external edge end section. <P>SOLUTION: For example, this method is used for heat-fusion-sealing the external edge end section of the composite plate material 2 for which on a veneer material 1a comprising the corrugated board made of the synthetic resin equipped with a central core R, another veneer material 1b is laminated. On the external edge end section A which is in parallel with the central core direction of the veneer 1a, the external edge end section B having the central core R section of another veneer material 1b which is to be integrally laminated is arranged. Thus, the resin amount at the heat-fusion-sealing section is increased, and the heat-weld-sealing is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique related to a heat welding seal at an end portion of a composite plate member having a laminated structure. More specifically, the present invention relates to a technique related to a heat welding seal at an outer edge end portion of a composite plate material in which synthetic resin corrugated cardboard having an intermediate core structure is laminated and integrated.

  A plate material formed of a synthetic resin is excellent in moldability, lightness, water resistance, heat retention / heat insulation properties, weather resistance, and the like. For this reason, in recent years, this synthetic resin plate material has been generally adopted as a face material for a transport container or a packing case, or as various structures.

  In particular, synthetic resin corrugated cardboard, which has the same core structure as paper corrugated cardboard, expands the use of containers and cases (boxes) that can be recovered from the transport destination and reused. It is used in clearly differentiated application fields.

  In addition, due to diversification and high performance of products and products in recent years, with respect to containers and cases for packing and transporting them, strength against loading pressure and impact force, buffer performance that can reduce vibration and swinging, Functionality such as antistatic properties, antibacterial properties, and chemical resistance has begun to be required. Therefore, in the field of synthetic resin corrugated board materials, movements of multilayering and composites of different materials have become apparent, and this movement is expected to further increase in the future.

  Here, it demonstrates based on FIG. 8 which shows a prior art example of a general technique. The single plate 10 made of synthetic resin corrugated cardboard shown in FIG. 8 is generally arranged in a predetermined direction and has a core (rib) R like a cross-sectional honeycomb structure. And such a single board | plate material 10 is cut | disconnected to a predetermined | prescribed size and form, or a crease line is formed and used. The core R imparts strength, shock buffering properties, etc. to the single plate material 10.

The outer edge end portion of the single plate member 10 is roughly divided so as to be orthogonal to the direction Z of the center core R, and the outer edge end portion X ₁ capable of observing the cross section of the center core structure R, and the center core direction are cut to be parallel with respect to, the outer end Y ₁ opening into shaped cross section U, made of.

Patent Document 1 discloses a technique of sealing by heating and welding the outer edge of a synthetic resin corrugated cardboard (hollow resin plate material) having an intermediate core structure.
Japanese Patent Application Laid-Open No. 2004-50399.

  In order to expand the applications and functions of synthetic resin corrugated cardboard as described above, a new attempt was made to develop a composite sheet material in which a plurality of plastic corrugated cardboards were laminated. It has been found that seal processing unevenness and damage are likely to occur at the outer edge end portion that is relatively reduced. In order to solve this problem, the area of the seal part was increased and the amount of resin was secured, so the width of the seal part formed by heat welding increased, resulting in harmony and unity in appearance design. There was a problem that it could not be taken.

  Accordingly, the present invention provides a composite plate material in which synthetic resin corrugated cardboard having a core structure is laminated and integrated so that the outer edge end portion with a small amount of resin is not formed, thereby heat sealing the outer edge end portion. The main object is to facilitate the processing and to form a seal portion having the same width at any outer edge of the composite plate.

  In the present invention, there is provided a method for heat-sealing and sealing the outer edge of a composite plate material having a structure in which another single plate material is laminated on a single plate material made of synthetic resin corrugated cardboard having a core structure, A composite in which the heat seal is performed by increasing the amount of resin in the heat-sealing seal portion by arranging the center portion of the other single plate material to be laminated and integrated at the outer edge end parallel to the core direction. Provided is a method for sealing an end of a plate material. In addition, the present invention provides a composite plate material that has been heat-sealed by the sealing method, and further a box-shaped body formed of the composite plate material.

  The present invention is characterized by devising to increase the amount of resin in the heat-sealing seal portion, for example, an arrangement relationship in which the core directions of at least two single plates constituting the composite plate are orthogonal or intersecting By stacking and integrating so as to become, the amount of resin in the heat-sealing seal portion is increased and heat-sealing sealing is performed.

  Alternatively, by increasing the number of cores per predetermined length of the single plate material constituting the composite plate material, compared to other single plate materials on which the single plate material is laminated, the amount of resin in the heat-sealed seal portion is increased. Heat seal.

  Furthermore, in the composite plate material laminated and integrated so that the core directions of at least two single plate materials constituting the composite plate material coincide with each other, the position of the core arrangement of the upper and lower single plate materials constituting the composite plate material By shifting the relationship, the amount of resin at the outer edge is increased and heat sealing is performed.

  According to the present invention, in the composite plate material in which synthetic resin corrugated cardboard having a core structure is laminated and integrated, the outer edge end portion with a small amount of resin is not formed. At the same time, a seal portion having the same width can be formed at any outer edge of the composite plate.

  Exemplary embodiments of objects and methods according to the present invention will be described with reference to the accompanying drawings. Note that the embodiment shown in the drawings exemplifies a preferred embodiment of the present invention, and the present invention is not interpreted narrowly.

  First, before entering into a specific description of the embodiment of the present invention, referring to FIGS. 6 and 7 which are reference drawings, a single plate material made of synthetic resin cardboard is laminated and integrated, and the outer edge end portion thereof is integrated. In the case of heat-sealing sealing, a newly discovered technical problem is confirmed.

As shown in FIG. 6, for example, when two single plate materials 10 and 10 are stacked and used, a configuration in which the core direction and the arrangement position of the cores are completely matched and integrated is considered. By adopting such a laminated structure, it is possible to further improve the strength with respect to the loading pressure, the shock buffering property, and the like as compared with the case of a single sheet 10. In this case, in the composite plate material 20 formed by laminating and integrating, the outer edge end portion X ₂ where the cross section of the core structure indicated by the symbol R can be observed in two steps and the opening portion having a U-shaped cross section are observed in two steps. the outer end Y ₂ which can be, so that is formed (see FIG. 6).

In the composite plate material 20 as shown in FIG. 6, there is a further difference in the amount of resin per unit area at the outer edge end portion X ₂ and the outer edge end portion Y ₂ than in the case of a single plate material 10. End up. That is, when comparing the outer edge portion X ₂ and the outer end Y _2, outer end Y ₂ which central core portion does not exist, the resin than the outer edge portion X ₂ which central core moiety is present in the upper and lower stages The absolute amount of becomes relatively smaller.

When the outer edge of the composite plate 20 is sealed by heat welding, the amount of resin is increased as compared to the case of a single plate 10, so it is necessary to lengthen the heat welding time. In small outer end Y _2, such sealing processing unevenness or damage has been found to be liable to occur.

To solve this problem, it is possible to cope with widening the welding zone in order to ensure the resin amount of the outer end Y ₂ side resin amount is insufficient. However, in such a workaround, the outer edge portion X ₂ and the outer end Y ₂ Prefecture, so that the difference in width of the sealing portion is formed by thermal fusion bonding occurs. For example, the seal X portion (width Wx) and the seal Y portion (width Wy) shown in FIG. 7 (Wx> Wy). As a result, the composite plate material 21 after the sealing process cannot be harmonized or unified in appearance design (see FIG. 7).

  Therefore, as a result of earnest research to prevent the occurrence of uneven sealing and damage at the seal portion and to achieve harmony and unification of the appearance of the composite plate 21 after the seal processing, the end of the composite plate according to the present invention is determined. And a composite plate material and a box-like body formed by the method. Hereinafter, exemplary embodiments of the present invention will be described mainly with reference to FIGS.

  First, FIG. 1 is a view showing an example of a synthetic resin cardboard board (single board) used for the composite board according to the present invention.

  First, reference numeral 1 in FIG. 1 indicates a single plate material made of synthetic resin corrugated cardboard having a honeycomb-shaped core (rib) structure indicated by reference numeral R. This single plate material 1 is a heat-sealable resin, that is, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinylidene chloride, fluororesin, polymethyl methacrylate, polyamide, polyester, polycarbonate, polyphenylene oxide, polyurethane, polyacetal, etc. The thermoplastic resin is used.

  In the field of manufacturing box-like bodies such as containers and cases, polyolefin resins and polycarbonate resins are suitable when comprehensively considering moldability, strength, cost, and the like. Moreover, well-known colorants, antistatic agents, antibacterial agents, adsorbents and other functional additives such as known additives can be appropriately added to the single plate material 1 as necessary.

  The structure form of the core R of the single plate 1 made of synthetic resin corrugated cardboard is not particularly limited to the honeycomb structure shown in FIG. For example, the cross-sectional form may have a corrugated structure. Further, the thickness and weight of the single plate 1 may be appropriately selected according to the purpose.

  Referring to FIG. 1, when a cross section of a pair of outer edge ends orthogonal to each other is observed, the outer edge end on one side is an end A (hereinafter referred to as a cross-sectional structure) that opens in a U-shape. And the other outer edge end portion is an end portion B (hereinafter referred to as “core end portion B”) in which the honeycomb-like cross-sectional structure of the core R can be observed. It has become.

  Here, in each of the opening end portion A and the core end portion B, a case is considered in which the resin is thermally melted and sealed by heat-sealing a region having a predetermined width from the end side portion. In this case, if the resin amount of the opening end portion A and the core end portion B is compared, the resin amount of the opening end portion A (the amount of the synthetic resin material) is less than that of the core end portion B. The amount is less by the absence (see FIG. 1).

  When two such single plate materials 1 are laminated and integrated so that the respective core directions C coincide with each other and the arrangement positions of the cores R completely coincide with each other, a composite plate material 20 as shown in FIG. It will be completed.

In the composite plate material 20 as shown in FIG. 6, the outer edge end portion X ₂ and the outer edge end portion Y ₂ have an opening end portion A and a single plate material 1 (corresponding to reference numeral 10 in FIG. 6). The difference in the amount of resin per unit area is further increased as compared with the case where the core end portions B are compared (described above).

That is, when the outer edge end A (see FIG. 1) and the outer edge end Y ₂ (see FIG. 6) are compared, the resin of the outer edge end (two-stage opening end) Y ₂ where the core structure portion does not exist. the difference between the quantity and the central core outer end structure moiety is present (two-stage form in the core end portion) resin amount of X ₂ is expanded twice.

  Therefore, in the first embodiment of the present invention, as shown in FIG. 2, the two single plate members 1a and 1b are laminated and integrated so as to be orthogonal to each other when the center direction C is viewed upward. Devise it.

  In the present invention, when the plate surfaces of the single plate materials 1a and 1b are fixed to each other, the method is not particularly limited, and for example, a method using an adhesive or a method of integrating by heat fusion can be employed. Further, when the single plate materials 1a and 1b are laminated and integrated, even if the two single plate materials 1a and 1b are stacked and integrated so that the core direction C is obliquely intersected when viewed from above. Good.

  Here, as can be seen by observing the laminated structure of the composite plate material 2 shown in FIG. 2, one corner portion is formed, and each of the pair of outer edge ends I and II that are orthogonal to each other is a pair of upper and lower sides. It has a laminated structure including an opening end A and a core end B. For this reason, the resin amount in both the outer edge end portions I and II is the same, and the resin amount in both the opening end portion A and the core end portion B in the case of the single plate material 1 (see FIG. 1). It can be seen that the difference has been eliminated.

  That is, when viewed from the outer edge end on the opening end A side of the single plate material 1a, another single plate material 1b is laminated and integrated with the single plate material 1a, so that the core end portion B of the single plate material 1b is obtained. Are added (open end A + core end B, see FIG. 2). On the other hand, when viewed from the outer edge end on the core end portion B side of the single plate material 1a, another single plate material 1b is laminated and integrated with the single plate material 1a. (The core end B + opening end A, see FIG. 2). For this reason, the resin amount of both the outer edge end portion I and the outer edge end portion II of the composite plate member 2 is equal.

  FIG. 3 is a diagram showing another embodiment (second embodiment) of the present invention.

  In this embodiment, another single plate material 1c having the same core R structure as that of the single plate material 1a is laminated on the single plate material 1a so that the center direction C coincides with the single plate material 1a. It is characterized in that the layers 1c are laminated so as to be shifted by a half length of the width D (see FIG. 3) between the cores R.

In such a layered structure, on the open end A ₁ of the single plate 1a, so that the open end A ₂ of the single plate member 1c is laminated (see FIG. 3). Compared to the case of the composite plate material 20 shown in FIG. 6, as a result of laminating the single plate material 1 c so as to be shifted by a half length of the width D (see FIG. 3) between the cores R, the opening end A in part, such as heat Chakuryoiki H _1, H ₂ side, the resin amount increases in corrugating R ₁ minute is achieved.

In the embodiment shown in FIG. 3, the resin amount on the opening end A side and the core end B side is equalized unlike the embodiment (1 embodiment) shown in FIG. I don't mean. However, in comparison with the outer edge end (opening end) Y ₂ of the composite plate material 20 having a laminated structure in which the center positions as shown in FIG. 6 are completely coincided with each other, reference numerals H ₁ and H ₂ in FIG. In the heat-sealed seal portion specified in (1), since the number of cores in the portion is increased by one, an increase in the resin amount is achieved.

More specifically, in the case of heat fusion sealing portion H _1, although the number of cores in a composite plate material 20 (FIG. 7) is 0, the composite sheet material 3 shown in FIG. 3, the number of the central core is increased to 1 and (and corrugating R ₁ increases), the thermal fusion sealing portion H _2, but the number of cores in a composite plate material 20 (FIG. 7) is a total of four, in the composite sheet material 3 shown in one of FIG. 3 The total number of cores has increased to 5 (upper 3 and lower 2). Thus, the resin amount increases in thermal fusion sealing portion H _1, H ₂ are achieved.

  Next, FIG. 4 is a diagram showing still another embodiment (third embodiment) according to the present invention.

  In this embodiment, another single plate material 1d is laminated on the single plate material 1a so that the core directions C coincide with each other, but the number of the cores R per predetermined length of one single plate material 1d is single. It is characterized in that it is denser than the plate material 1a. More specifically, the number of arrangement of the cores R per predetermined unit length of the single plate material 1d is designed to be twice that of the single plate material 1a.

In the embodiment having such a laminated structure, unlike the embodiment shown in FIG. 2, the resin amounts on the opening end A side and the core end B side are not equalized. However, when compared with the outer end (open end) Y ₂ of the composite sheet 20 having a central core density was stacking single plate match completely vertical structure as shown in FIG. 6, 4 In the heat-sealed seal portion specified by the symbols H ₁ and H ₂ , the number of cores in the same portion is increased, so that an increase in the amount of resin is achieved.

More specifically, when compared with heat fusion sealing portion H _1, although the number of cores in a composite plate material 20 (FIG. 6) is 0, the composite in sheet 4, the central core number 4 1 is increasing in the case of comparison by thermal fusion sealing portion H _2, but the number of cores in a composite plate material 20 (FIG. 6) is vertically total of four, in the composite sheet material 3 shown in one of FIG. 4, the central core The number has increased to a total of 7 (upper 5 and lower 2). Thus, the resin amount increases in thermal fusion sealing portion H _1, H ₂ are achieved.

  In the embodiments of the composite plate materials 2, 3, 4 and the like as exemplified above, it is possible to secure a minimum amount of resin necessary for heat fusion at each outer edge end portion. For this reason, it is not necessary to take a heat sealing part (seal part) widely to secure the amount of resin.

  As a result, in the case of the composite plate materials 2, 3, and 4, as shown in FIG. 5, the heat-sealed seal portions X and Y having the same width (Wx = Wy) are formed at the outer edge ends of all sides. Is easier (see FIG. 5 and FIG. 7 for comparison).

  The composite plate materials 2, 3, and 4 described above can be used as a structure or a protective material in a plate shape. Also, by applying crease lines, half-cut lines, etc., connecting the composite plate materials 2, 3, 4 with guide members, hinges, etc., or by punching them into an unfolded form that becomes a desired assembled form, Desired containers and cases can be produced freely.

  The composite plate material according to the present invention can be widely used as various structural bodies and protective materials, and further as a face material constituting a box-shaped body such as a container or a case. The box-shaped body according to the present invention can be used as a container or a case for transportation or storage, and in particular, can be used as a returnable box that can be used repeatedly.

It is a figure which shows one form of the synthetic resin cardboard board | plate materials (single board | plate material) used for the composite board | plate material which concerns on this invention. It is a figure which shows 1st Embodiment of the composite board | plate material which concerns on this invention. It is a figure which shows 2nd Embodiment of the composite board | plate material which concerns on this invention. It is a figure which shows 3rd Embodiment of the composite board | plate material which concerns on this invention. It is a figure for demonstrating the structure of the heat sealing | fusion seal | sticker part of the composite board | plate material which concerns on this invention. It is a reference perspective view for demonstrating the state which laminated | stacked two sheets of synthetic resin corrugated cardboards so that a position may correspond with a center direction. FIG. 7 is a reference partial perspective view showing a state where two outer edges of the synthetic resin corrugated cardboard shown in FIG. 6 are heat-sealed and sealed. It is an enlarged view for demonstrating the structure of the conventional general synthetic resin cardboard.

Explanation of symbols

1 (1a-1d) Single plate material (synthetic resin cardboard)
2,3,4 Composite plate A Outer edge (also known as open edge)
B Outer edge end (also known as core end)
C Center direction R Center

Claims (6)

It is a method for heat-sealing and sealing the outer edge of a composite plate having a structure in which another single plate is laminated on a single plate made of synthetic resin corrugated cardboard having a core structure,
By disposing the core portion of another single plate material to be laminated and integrated at the outer edge end parallel to the center direction of the single plate material, the amount of resin in the heat-sealed seal portion is increased and the heat-welded seal is The sealing method of the edge part of the composite board material made to perform. By laminating and integrating so that the core direction of at least two single plates constituting the composite plate is orthogonal or intersecting,
The method for sealing an end portion of a composite plate material according to claim 1, wherein the amount of resin in the heat-sealed seal portion is increased. By making the number of cores per predetermined length of the single plate material constituting the composite plate material denser than other single plate materials on which the single plate material is laminated,
The method for sealing a composite plate material end according to claim 1, wherein the amount of resin at the outer edge is increased. In the composite plate material laminated and integrated so that the core directions of at least two single plate materials constituting the composite plate material match,
The method for sealing an end portion of a composite plate material according to claim 1, wherein the amount of resin at the outer edge end portion is increased by shifting the positional relationship of the core arrangement of the upper and lower single plate materials constituting the composite plate material. .   A composite plate material that is heat-sealed and sealed by the method according to any one of claims 1 to 4.   A box-shaped body formed of the composite plate material according to claim 5.

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