JP5709689B2 - Composite bag with excellent anti-drop bag impact resistance - Google Patents

Description

The present invention relates to a composite bag having excellent impact resistance against a bag drop impact. More specifically, the present invention is excellent in breathability or deaeration while ensuring moisture proofness, and also disperses and absorbs a drop impact. The present invention relates to a composite bag using a composite sheet that is excellent in impact resistance and that can reduce material and finished volume.
It is characterized by the fact that, as a composite bag material, when joining a mesh-like plastic sheet to a paper-like sheet that has air permeability to itself , these sheets are brought into close contact with each other and joined to the mesh-like plastic sheet. A non-breathable laminating resin, covering the entire surface of the mesh-like plastic sheet, joining the paper-like sheet and the mesh-like plastic sheet, and making the intimate part of these sheets non-joining parts, That is, a composite sheet in which the peel strength of the non-contact portion between the sheets is formed as a strongly bonded portion of at least 200 gf / cm is used .

  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, a non-breathable laminate resin for bonding is applied to the surface of the mesh-like plastic sheet in a state where the sheet surfaces of the mesh-like plastic sheet are in close contact with a paper-like sheet having air permeability. Supplying, covering the entire surface of the mesh-like plastic sheet, joining the paper-like sheet and the mesh-like plastic sheet, a close portion between these sheets as a non-joined portion , There is provided a composite bag characterized in that a composite sheet having a strongly bonded portion having a peel strength of at least 200 gf / cm is used .

Composite sheet used as a composite bag material of the present invention, in a state of being in close contact with a paper-like sheet and net-like plastic sheet, covered cover the entire surface thereof to supply the non-breathable laminate resin reticulated plastic sheet, paper Since both the sheet and the non-breathable laminate resin are joined together, it has moisture resistance and can ensure air permeability or deaeration in the paper-like sheet. Therefore, when an impact is received, the impact is dispersed and absorbed at the non-joined portion, and the impact becomes difficult to concentrate on the impact portion, thereby preventing damage.

In addition, since this composite bag has a peel strength of at least 200 gf / cm at the strongly bonded portion, the shock is dispersed and absorbed by the non-bonded portion serving as a degassing passage, and the impact is difficult to concentrate on the impacted portion. , Can prevent damage when dropping the bag .

The composite bag of the present invention is excellent in breathability or deaeration while ensuring moisture proofness, and when subjected to an impact, the non-joined part functions as a deaeration passage, and absorbs and disperses the falling bag impact. There is an effect that it is excellent .

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

As described above , the composite bag of the present invention is excellent in breathability or deaeration while ensuring moisture proofness, and also has excellent impact resistance because it absorbs and absorbs the falling bag impact, and the material and finished volume can be reduced. It can produce an excellent effect .

It is a partial top view of the composite sheet which comprises the composite bag 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 the composite bag 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, a composite sheet 1 which is a material of a composite bag is a front surface of the mesh plastic sheet 3 in a state where 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 paper-like sheet 2 and the mesh-like plastic sheet 3 are in close contact with each other, the intimate part between these sheets 2 and 3 is defined as a non-joined part 7, and the non-intimate part between these sheets 2 and 3 is strongly This is configured as a joint portion 5.

The paper-like sheet 2 is not particularly limited as long as it is a sheet that is permeable to itself, and among them, craft paper or embossed paper is preferably used.

  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.

Incidentally, wherein the strong junction 5 of the composite bag of the present invention is state, and are the peel strength of 200 gf / cm or more, the non-joint portions 7, peel strength because there because not bonded at 0 gf / cm is there. 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.

1 to 3 show a composite sheet 1 used as a material for a composite bag according to the present invention. When a mesh plastic sheet 3 is joined to the composite sheet 1 and a paper-like sheet 2, the sheets 2 and 3 are brought into close contact with each other. In this state, the non-breathable laminate resin 4 for bonding is supplied to the mesh plastic sheet 3 and the entire surface of the mesh plastic sheet 3 is covered to increase the bonding pressure between the paper sheet 2 and the mesh plastic sheet 3. The close contact portion between the sheets 2 and 3 is defined as a non-bonded portion 7, and the non-close contact portion between the sheets 2 and 3 is defined as a strongly bonded portion 5.

Since the composite sheet 1 which is the material of the composite bag of the present invention is formed as described above, the paper-like sheet 2 is covered with the mesh-like plastic sheet 3 and the entire surface thereof is covered with the non-breathable laminate resin 4. Since it is bonded in a state, it has moisture resistance and can ensure air permeability or deaeration in the paper-like sheet 2, and in addition , a strongly bonded portion 5 and a non-bonded portion 7 having a specific peel strength are provided. Therefore, in the composite bag manufactured with this composite sheet 1, when the bag is dropped in a state in which the stored item is contained, the impact is dispersed and absorbed in the non-joining portion 7 that functions as a degassing passage, It is difficult for the impact to concentrate on the dropped bag part, and damage 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 bag of the present invention is excellent in breathability or deaeration while ensuring moisture proofness, and also wants to obtain a composite bag that has excellent impact resistance by dispersing and absorbing falling-body impacts and that can reduce the material and finished volume. In some cases, the availability becomes very 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 (1)

A non-permeable laminate resin for bonding is supplied to the surface of the mesh-like plastic sheet in a state where the sheet surfaces of the mesh-like plastic sheet are in close contact with a paper-like sheet having air permeability, and the mesh-like plastic sheet The paper sheet and the mesh-like plastic sheet are bonded together, the intimate part between these sheets is defined as a non-joined part, and the peel strength of the non-intimate part between these sheets is at least 200 gf / cm A composite bag characterized by using a composite sheet having a strong bonding site.