JP2013039740A - Composite sheet and composite bag using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite sheet excellent in impact resistance while ensuring dampproofness and by dispersing and absorbing a bag drop impart, and reduced in material and finished volume, and a composite bag using the same.SOLUTION: In bonding a meshed plastic sheet 3 to a paper sheet 2, the sheets are bonded with a non breathable laminating resin 4 for bonding with the non breathable laminating resin 4 for bonding brought into close contact with the entire surface of at least one of the sheets 2, 3 such that strongly bonded parts 5 and weakly bonded parts 6 of bonded parts between the paper sheet 2 and the meshed plastic sheet 3 are alternately positioned, thereby obtaining the composite sheet excellent in dampproofness and breathability and excellent in impact resistance by dispersing and absorbing the impact, and reduced in material and finished volume, and the composite bag using the same.

Description

The present invention relates to a composite sheet having excellent impact resistance against a bag drop impact and a composite bag using the same, and more specifically, while ensuring moisture proofness, it also disperses and absorbs a drop impact. The present invention relates to a composite sheet that is excellent in impact resistance and that can reduce material and finished volume, and a composite bag using the same.
The characteristic feature is that a non-breathable laminate resin for bonding is in intimate contact with the entire surface of at least one of a paper-like sheet and a mesh-like plastic sheet so that strong and weakly bonded portions are alternately positioned in this state. It is the structure of the composite sheet | seat comprised by joining with non-breathable laminate resin.

  As shown in FIG. 6, in the conventional composite sheet, an adhesive 51 is applied to a paper body 50 in a grid pattern at an oblique angle, and another synthetic resin cloth 52 is bonded thereto, whereby the paper body 50 and the synthetic resin cloth 52 are bonded. The non-adhesive part of the gap 53 is formed between them (for example, see Patent Document 1).

  Further, as shown in FIG. 7, the synthetic resin cloth 52 and the paper body 50 are bonded with an adhesive 51, and the adhesive 51 has narrow vertical plastic strips 51a having a width of 1 to 4 mm arranged closely in the vertical direction. The width W1 of the narrow vertical plastic strip 51a having a width of 1 to 4 mm is substantially equal to or smaller than the width of the mesh m of the synthetic resin cloth 52, and the mesh pitch x of the synthetic resin cloth 52 is 10 mm or less. In addition, a composite sheet is known in which one pitch of a narrow vertical plastic strip 51a and a vertical strip pitch p of the interval W2 is disposed with respect to the first to third pitches (for example, Patent Document 2). reference).

  Further, as shown in FIG. 8, the paper body 50 is superimposed on the film surface 54a of the film laminate sheet 54 bonded to the entire surface of the synthetic resin cloth 52, and the film surface 54a and the paper body 50 have a large number of dot-like shapes. The paper is bonded via the bonding portion 55, and the length of the paper body 50 in tension is about 1.01-1.20 times the length in tension of the film laminate sheet 54. There is known a composite sheet in which the body 50 is undulated by forming an indeterminate slack or slack 56 around each bonding portion 55 (see, for example, Patent Document 3).

  Further, as shown in FIG. 9, the synthetic resin cloth 52 and the paper body 50 are bonded to the entire surface of the synthetic resin cloth 52 and have a concave portion 57 on the paper body 50 side, and partially bonded to the paper body 50. The composite sheet is formed by adhering the synthetic resin cloth 52 and the paper body 50 with the synthetic resin layer 58 interposed therebetween and forming a large number of exhaust passages 59 over the entire length of the synthetic resin layer 58 on the paper body 50 side. Is known (see, for example, Patent Document 4).

Japanese Utility Model Publication No. 55-32854 Japanese Utility Model Publication No. 63-48536 Japanese Utility Model Publication No. 60-3083 Japanese Utility Model Publication No.57-21887

  The composite sheet of Patent Document 1 is bonded to the paper body 50 with an adhesive 51 in which a synthetic resin cloth 52 is applied in a grid pattern to ensure air permeability, and the paper body 50 is subjected to non-breathability treatment or bonded. Although it is very convenient in that the agent 51 can be applied to the entire surface to ensure air permeability, this composite sheet has a homogeneous structure when subjected to a bag drop impact. May be difficult to disperse and absorb.

  In the composite sheet of Patent Document 2, when the paper body 50 and the synthetic resin cloth 52 are bonded, the non-breathable strip of the synthetic resin cloth 52 and the non-breathable vertical plastic strip 51a of the adhesive 51 are aligned and bonded. Since the air permeability of the composite sheet is large, the composite sheet is difficult to disperse and absorb the impact because the composite sheet has a homogeneous joining structure when subjected to a drop impact. In addition, as a result of ensuring a large air permeability, there are few adhesion parts, and the impact concentrates on the dropped bag part, so there is a possibility that the bag breaks due to insufficient strength of the adhesion part.

  The composite sheet of Patent Document 3 is bonded in a state in which the paper body 50 forms an indeterminate slack or slack 56 on the film surface 54a of the film laminate sheet 54 bonded to the entire surface of the synthetic resin cloth 52. Therefore, it is very convenient in that it is excellent in breathability or deaeration while ensuring moisture proofness and is strong against falling body impact. However, since the paper body 50 is bonded to the film surface 54a of the film laminate sheet 54 in a state where an irregular slack or a slack 56 is formed, the paper body 50 is used much. The finished volume will increase accordingly.

  The composite sheet of Patent Document 4 is bonded to the entire surface of the synthetic resin cloth 52 and the paper body 50 and has a concave portion 57 on the paper body 50 side when the synthetic resin cloth 52 and the paper body 50 are bonded. Since the synthetic resin layer 58 is interposed, the bag made of this composite sheet is difficult to disperse and absorb the impact because the composite sheet has a homogeneous adhesive structure when subjected to the bag drop impact. There is a risk of breaking the bag because the impact concentrates on.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a composite sheet and a composite bag using the composite sheet that can ensure moisture resistance, disperse and absorb falling body impact, have excellent impact resistance, and can reduce material and finished volume. There is.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, when joining a mesh-like plastic sheet to a paper sheet, the paper-like sheet and the paper-like sheet are in close contact with a non-permeable laminate resin for joining on the entire surface of any one of these sheets. There is provided a composite sheet characterized in that the joined state of the mesh-like plastic sheet is joined with the non-breathable laminate resin so that strong joints and weak joints are alternately positioned.

  Further, according to the present invention, there is provided a composite sheet in which the strongly bonded portion has a peel strength of at least 200 gf / cm and the weakly bonded portion has a peel strength of less than 200 gf / cm.

  Moreover, according to this invention, the composite bag characterized by using the said composite sheet is provided.

The operation of the first problem solving means is as follows.
That is, since the non-permeable laminate resin for bonding is in close contact with the entire surface of at least one of the paper-like sheet and the mesh-like plastic sheet, it has moisture proofness, and has a strong bonding site and weakness during the bonding. Since the joint portions are alternately positioned, when an impact is applied, the impact is dispersed and absorbed at the weak joint portions, and the impact becomes difficult to concentrate on the impact portion, thereby preventing damage.

  The effect of the second problem solving means is that when the peel strength of the strong joint portion is 200 gf / cm or more and the peel strength of the weak joint portion is less than 200 gf / cm, the impact is dispersed and absorbed by the weak joint portion, It becomes difficult for the impact to concentrate on the impact portion, and damage can be prevented.

  The action by the third problem solving means is that the composite bag using the composite sheet has the characteristic action of the composite sheet described above.

  The composite sheet of the present invention is excellent in impact resistance since it absorbs and absorbs moisture while securing moisture resistance, and has the effect of further reducing the material and finished volume.

  In addition, the composite sheet of the present invention can obtain the above-described effects even when a strongly bonded portion and a non-bonded portion are generated during the bonding.

  In addition, the composite sheet of the present invention can achieve the above-described effects when the peel strength at the strong joint portion is 200 gf / cm or more and the peel strength at the weak joint portion is less than 200 gf / cm.

2 is a plan view of a part of a composite sheet showing an embodiment of the present invention shown in Example 1. FIG. It is sectional drawing which follows XY of FIG. 6 is a plan view of a part of a composite sheet showing a modification of the embodiment of the present invention shown in Example 1. FIG. It is sectional drawing which follows XY of FIG. It is a perspective view which shows the manufacture state of the composite sheet which shows embodiment of this invention. It is sectional drawing which shows a prior art example. It is sectional drawing which shows a prior art example. It is sectional drawing which shows a prior art example. It is sectional drawing which shows a prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

In the drawing, the composite sheet 1 is in a state in which a non-breathable laminate resin 4 for bonding is in close contact with the entire surface of at least one of the two sheets 2 and 3 when the mesh-like plastic sheet 3 is bonded to the paper sheet 2. In addition, the paper-like sheet 2 and the mesh-like plastic sheet 3 are joined by the non-breathable laminate resin 4 so that the strong joint portions 5 and the weak joint portions 6 are alternately positioned.

  The paper-like sheet 2 is not particularly limited as long as it is usually used in the packaging industry, and examples thereof include kraft paper, polyethylene laminated kraft paper, and embossed paper.

  The mesh plastic sheet 3 is not particularly limited as long as it is a mesh sheet, and examples thereof include split cloth, soft cloth, polyethylene cloth, and the like.

  The non-breathable laminate resin 4 is not particularly limited as long as it is a bonding agent capable of bonding the paper-like sheet 2 and the mesh-like plastic sheet 3, but many conventionally known polyolefin resins are used. Is done.

  When the composite sheet is produced by joining the paper sheet 2 and the mesh plastic sheet 3 with the non-breathable laminate resin 4, the composite sheet is brought into close contact with the entire surface of at least one of the sheets 2 and 3. The non-breathable laminate resin 4 is realized so that air permeability is achieved, and the joint portions of the paper-like sheet 2 and the mesh-like plastic sheet 3 are alternately located at the strong joint portions 5 and the weak joint portions 6. It is formed by joining.

  In the composite sheet 1, the joint portion between the paper sheet 2 and the mesh plastic sheet 3 is alternately located between the strong joint portion 5 and the weak joint portion 6. For example, the joint portion is strongly joined every 10 mm to 25 mm width. It forms so that the site | part 5 and the weak junction site | part 6 may be located alternately, for example, it forms so that the strong junction site | part 5 of 25 mm width and the weak junction site | part 6 of 50 mm width may be located alternately. That is. In any case, in the composite sheet 1, the strong joint portions 5 and the weak joint portions 6 are alternately positioned. For example, the strong joint portions 5 having a predetermined width of 10 mm to 25 mm are in contact with each other. In other words, the weakly bonded portions 6 having a predetermined width of 25 mm to 50 mm are not in contact with each other.

  In the present invention, it is necessary that the paper sheet and the mesh-like plastic sheet are joined with the non-breathable laminate resin so that the strong joining sites and the weak joining sites are alternately positioned. Therefore, although the strongly bonded portion and the weakly bonded portion are not respectively defined by the numerical values of peel strength, from a practical point of view, the peel strength of the strongly bonded portion 5 is 200 gf / cm or more, It is preferable that the peel strength at the bonding site 6 is less than 200 gf / cm. At this time, the upper limit of the peel strength at the strong joint portion and the lower limit of the peel strength at the weak joint portion are not particularly limited. In the composite bag manufactured with the composite sheet 1 having such a strongly bonded portion 5 and the weakly bonded portion 6, the impact is dispersed and absorbed by the weakly bonded portion 6 when the bag is dropped in the state where the stored item is contained. Thus, it is difficult for the impact to concentrate on the dropped bag part, and damage can be prevented.

  Incidentally, in the composite bag manufactured with the composite sheet 1 in which the peel strength of the strongly bonded portion 5 is less than 200 gf / cm and the peel strength of the weakly bonded portion 6 is lower than that, the drop in the state in which the stored items are contained. At the time of bagging, the impact may be dispersed and absorbed not only at the weakly bonded portion 6 but also at the strongly bonded portion 5, and as a result, the bag may be damaged.

  In the joint portion of the composite sheet 1, the strong joint portion 5 and the weak joint portion 6 have a strong joint pressure when the paper sheet 2 and the mesh plastic sheet 3 are joined. For example, when a weight of 24 kg / cm to 26 kg / cm is applied per 1 cm of the width of the joining sheet and a weak pressure is applied to the weakly joined portion 6, for example, a weight of 19 kg / cm to 21 kg / cm is applied. can do.

  Moreover, you may make it like FIG. 3, 4 as a modification of the joining site | part of this composite sheet 1. FIG. That is, after forming the diagonally lower left strong joint portion 5 of FIG. 1, the same or slightly higher joining pressure is formed to form the lower right diagonally strong joint portion 5 of FIG. 3. It is good also as the composite sheet 1a which made the crossing place the special strong junction part 5H. By doing in this way, in the composite bag manufactured with this composite sheet 1a, when dropping the bag with the stored contents, the impact is dispersedly absorbed in the strong joint part 5 in addition to the weak joint part 6. As a result, it is difficult for the impact to concentrate on the dropped bag part, and damage can be prevented.

  FIG. 5 shows that when the mesh-like plastic sheet 3 is joined to the paper-like sheet 2 of FIGS. 1 to 4, a non-breathable laminate resin 4 is supplied between these sheets 2, 3, and the mesh-like plastic sheet 3. It is a perspective view which shows the manufacture state which joins the whole surface and the paper-like sheet | seat 2 whole surface.

  As mentioned above, although the Example of this invention was described, it should be understood that a concrete structure is not limited to this, and the change in the range which does not deviate from the summary of this invention is possible suitably.

  The composite sheet of the present invention and the composite bag using the composite sheet, and the composite sheet using the composite sheet capable of reducing moisture impact and dispersing and absorbing the falling body impact and having excellent impact resistance, and further reducing the material and finished volume. When it is desired to obtain a composite bag, the availability becomes extremely high.

DESCRIPTION OF SYMBOLS 1, 1a Composite sheet 2 Paper-like sheet 3 Mesh-like plastic sheet 4 Non-breathable laminate resin 5 Strongly joined part 5H Extra strong joined part 6, 51 Weakly joined part 50 Paper 51 Adhesive 51a Vertical plastic strip 52 Synthetic resin cloth 53 Clearance 54 Film laminate sheet 54a Film surface 55 Adhesion part 56 Slack or slack line 57 Recessed part 58 Synthetic resin layer 59

Claims (3)

  When joining a mesh-like plastic sheet to a paper-like sheet, a joining portion between the paper-like sheet and the mesh-like plastic sheet in a state where a non-breathable laminate resin for joining is in intimate contact with the entire surface of at least one of these sheets However, the composite sheet is bonded with the non-permeable laminating resin so that strong bonding sites and weak bonding sites are alternately positioned.   The composite sheet according to claim 1, wherein at least the peel strength of the strongly bonded portion is 200 gf / cm or more, and the peel strength of the weakly bonded portion is less than 200 gf / cm. A composite bag using the composite sheet according to claim 1.