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Paper sack

A paper bag and bag technology, applied in the field of paper bags with a new structure, can solve problems such as insufficient weight, low strength, and bag rupture, and achieve the effects of preventing sliding, ensuring safety, and reducing accidents

Inactive Publication Date: 2004-10-06
SHINDUCK IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although these prior art techniques are an improvement over earlier techniques, they still have problems such as bag breakage due to the low strength of the seams at the bottom and top of the bag
In particular, when the cement is bagged, the air cannot escape satisfactorily, and trapped air forms inside the bag which in turn causes underweight
Furthermore, air trapped in the bag causes its contents to deteriorate (eg cement hardens) and the bag ruptures
Thus, these bags cannot be a substitute for bags made according to the previously disclosed patents due to these disadvantages

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
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Effect test

Embodiment 1

[0062] figure 2 The laminated structure of the double core paper according to the present invention is described, showing the structure of the DMP 20, that is, a core paper layer 2a, an adhesive layer 2b, a synthetic resin wire layer 2c, an adhesive layer 2d and a core paper layer 2e-a Build up layer by layer. The components of the adhesive were 70 wt% water-soluble acryl emulsion, 29 wt% EVA and 1 wt% softener.

Embodiment 2

[0064] image 3 Illustrating another structure of the double core paper according to the present invention, the structure of the DMP is shown, that is, the core paper layer 2a, the adhesive layer 2b and the core paper layer 2e are stacked one on top of the other. The composition of the adhesive is the same as in Example 1.

Embodiment 3

[0066] Figure 4 and Figure 5 An example of a double-layered paper bag according to the present invention is illustrated, which consists of a sheet of plain kraft paper used as the outer layer 3a, and a double core paper used as the middle and inner layer 20 according to Example 1.

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Abstract

A paper sack of novel constitution for packing heavyweight materials is manufactured with the dual medium paper (DMP) or modified medium paper (MMP) manufactured by inserting synthetic fiber and the like between two plies of medium paper in the form of nets, and then pasting them with a water-soluble binder. The sack for packing heavyweight materials is composed of one sheet of kraft paper for the outer ply, one or two plies of paper selected from the group consisting of medium paper, DMP and MMP for the intermediate ply, and one sheet of paper selected from the group consisting of DMP, MMP, BKP and kraft paper for the inner ply.

Description

technical field [0001] The present invention relates to a paper bag of a new structure for packing heavy weight materials, especially to a new structure for packing cement, sugar, flour, fodder, etc. made of medium paper, double core paper and improved medium paper paper bag. Background technique [0002] Traditional paper bags for packaging heavy weight materials such as cement, sugar, flour, fodder, etc. are manufactured by overlapping multiple sheets of kraft paper processed from 100% virgin pulp to form three or four layers of the bag Or processed by mixing raw pulp with 20% or less by weight of waste paper. For the manufacture of double-layer paper bags, special expandable papers are used, such as Clupack (Clupack, USA), composite paper or other similar papers. Although ordinary kraft paper is not as strong as specialty paper, kraft paper bags may, however, be constructed as three to four-ply bags to prevent breakage during handling or shipping, and to resist moisture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B29/00B65D30/08D21H27/10D21H27/32D21H27/34D21H27/38
CPCD21H27/32B32B29/00D21H27/34D21H27/38D21H27/10B65D31/02B32B2439/70B32B29/005B32B29/002B32B2439/46B32B2305/38B32B7/12B32B2250/26B32B2317/122B32B2553/00
Inventor 崔久和方奉镇
Owner SHINDUCK IND
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