JP2013039741A - Composite sheet and composite bag using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite sheet excellent in breathability while ensuring dampproofness, excellent in impact resistance by dispersing and absorbing a bag drop impact, 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, a non breathable laminating resin 4 for bonding is supplied to the meshed plastic sheet 3 with both of the sheets 2, 3 brought into close contact with each other to cover the entire surface of the meshed plastic sheet 3, the paper sheet 2 and the meshed plastic sheet 3 are bonded together to form an unbonded part 7 by close contact parts of both of the sheets and to form a strongly bonded part 5 by not close contact parts of both of the sheets, thereby obtaining the composite sheet excellent in dampproofness and breathability, excellent in impact resistance because the unbonded part 7 functions as a deaeration passage 6 to disperse and absorb 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, it is excellent in air permeability or deaeration while ensuring moisture resistance. The present invention relates to a composite sheet that is excellent in impact resistance by dispersing and absorbing a falling body impact, and can further reduce the material and finished volume, and a composite bag using the same.
The characteristic feature is that when the mesh-like plastic sheet is joined to the paper-like sheet, a non-permeable laminate resin for joining is supplied to the mesh-like plastic sheet in a state where these sheets are brought into close contact with each other, and the mesh-like plastic sheet is supplied. Cover the entire surface of the plastic sheet, join the paper-like sheet and the mesh-like plastic sheet, and make the intimate part of these sheets as a non-joining part, and the non-intimate part of these sheets as a strong joint part The composition of the composite sheet.

  In the conventional composite sheet, as shown in FIG. 4, an adhesive 51 is applied to the paper body 50 in a grid pattern at an oblique angle, and another synthetic resin cloth 52 is adhered thereto, and 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. 5, 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. 6, 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 are formed in a 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. 7, 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 so as to partially adhere 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 slack 56 is formed, the paper body 50 is often used. 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.

  Accordingly, an object of the present invention is to provide a composite sheet that has excellent breathability or deaeration while ensuring moisture proofness, is excellent in impact resistance by dispersing and absorbing falling body impacts, and can further reduce material and finished volume. The purpose is to provide a used composite bag.

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-like sheet, supplying the non-breathable laminate resin for joining to the mesh-like plastic sheet in a state where these sheets are in close contact with each other, Covering the entire surface of the reticulated plastic sheet, the paper sheet and the reticulated plastic sheet are joined, the intimate part of these sheets as a non-joined part, the non-tight part of these sheets as a strongly joined part A composite sheet characterized by the above is provided.

  Moreover, according to this invention, the composite sheet whose peeling strength of the said strong junction site | part is at least 200 gf / cm is provided.

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

  The action of the first problem solving means is that the paper-like sheet and the mesh-like plastic sheet are brought into close contact with each other, and a non-breathable laminate resin is supplied to the mesh-like plastic sheet so as to cover the entire surface thereof. Since it is bonded, it has moisture resistance and can also ensure air permeability or deaeration in a paper sheet, and there are strong bonded parts and non-bonded parts at the time of bonding. Since the joining portion functions as a deaeration passage, the impact is dispersed and absorbed, and the impact becomes difficult to concentrate on the impact portion, thereby preventing breakage.

  The effect of the second problem solving means is that the impact strength is dispersed and absorbed by the non-bonded portion serving as a degassing passage because the peel strength of the strongly bonded portion is at least 200 gf / cm, and the shock is concentrated on the impact portion. It becomes difficult to prevent breakage.

  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 breathability or deaeration while ensuring moisture proofness, and also disperses and absorbs when subjected to an impact, so that it has excellent impact resistance and has the effect of 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 the composite sheet of the present invention, the above effect can be more reliably obtained when the peel strength of the strongly bonded portion is at least 200 gf / cm.

  In addition, the composite bag of the present invention using the above composite sheet is excellent in breathability or deaeration while ensuring moisture proofness, and also has excellent impact resistance because it absorbs and disperses the falling bag impact. The volume can be reduced, and there is an effect that an easy-to-use composite bag can be obtained.

It is a partial top view of the composite sheet which shows embodiment of this invention. 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 covers the front surface of the mesh plastic sheet 3 in a state in which both the sheets 2 and 3 are brought into close contact with each other when the mesh plastic sheet 3 is joined to the paper sheet 2. The sheet-like sheet 2 and the mesh-like plastic sheet 3 are joined together, and a close contact portion between the sheets 2 and 3 is set as a non-joined portion 7 and a non-close contact portion between the sheets 2 and 3 is formed as a strongly joined portion 5. Is.

  The paper-like sheet 2 is not particularly limited as long as it is a breathable sheet, and examples thereof include craft 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.

  In the present invention, the strongly bonded portion 5 is practically preferable to have a peel strength of 200 gf / cm or more, and the non-bonded portion 7 is not bonded. The peel strength is 0 gf / cm. In the composite bag manufactured with the composite sheet 1 having such a strongly bonded portion 5 and the non-bonded portion 7, the impact that acts as the deaeration passage 6 when the bag is dropped in the state in which the stored items are contained. Dispersed and absorbed at the joint site 7, it becomes difficult for the impact to concentrate on the dropped bag part, and damage can be prevented.

  FIGS. 1 to 3 show a composite sheet 1 of the present invention. When a mesh-like plastic sheet 3 is joined to the composite sheet 1 and a paper-like sheet 2, the mesh-like plastic is in a state where these sheets 2 and 3 are brought into close contact with each other. The sheet 3 is supplied with a non-breathable laminating resin 4 for bonding, and covers the entire surface of the reticulated plastic sheet 3 to bond the paper sheet 2 and reticulated plastic sheet 3 with an increased bonding pressure. 3 is a non-bonded portion 7 and a non-close portion between the sheets 2 and 3 is a strongly bonded portion 5.

Since the composite sheet 1 is formed as described above, the reticulated plastic sheet 3 is joined to the paper sheet 2 with the entire surface covered with the non-breathable laminate resin 4. The composite bag manufactured with this composite sheet 1 has moisture resistance and can ensure air permeability or deaeration in the paper-like sheet 2, and also has a strongly bonded portion 5 and a non-bonded portion 7. Then, when a bag is dropped with the stored contents in it, the shock is dispersed and absorbed by the non-joining part 7 functioning as a deaeration passage, and it becomes difficult for the shock to concentrate on the dropped bag part, and damage is caused. It can be prevented.

  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 are excellent in breathability or deaeration while ensuring moisture proofness, and are excellent in impact resistance by dispersing and absorbing falling body impacts, and in addition, there are few materials and finished volume. When it is desired to obtain a composite sheet and a composite bag using the composite sheet, the applicability becomes extremely high.

DESCRIPTION OF SYMBOLS 1 Composite sheet 2 Paper-like sheet 3 Mesh-like plastic sheet 4 Non-breathable laminate resin 5 Strong joint part 6 Deaeration passage 7 No joint part 50 Paper 51 Adhesive 51a Vertical plastic strip 52 Synthetic resin cloth 53 Gap 54 Film laminate sheet 54a Film surface 55 Bonding portion 56 Slack or slackening 57 Recessed portion 58 Synthetic resin layer 59 Exhaust passage

Claims (3)

   When joining a mesh-like plastic sheet to a paper-like sheet, a non-permeable laminate resin for joining is supplied to the mesh-like plastic sheet in a state where these sheets are in close contact with each other, and the entire surface of the mesh-like plastic sheet is covered. A composite sheet characterized in that the sheet-like sheet and the mesh plastic sheet are joined to each other, a close contact portion between the sheets is set as a non-joined portion, and a non-close contact portion between the sheets is set as a strongly joined portion. .   The composite sheet according to claim 1, wherein at least the peel strength of the strongly bonded portion is 200 gf / cm. A composite bag using the composite sheet according to claim 1.