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Block bottom valve packing bag containing thermoplastic plastics and manufacturing method thereof

A technology of thermoplastics and production methods, which is applied in the field of packaging bags, can solve problems such as inability to form at one time, pollution, and complicated production processes, and achieve the effects of small external environmental impact, automatic production, and environmental pollution avoidance

Inactive Publication Date: 2012-01-25
王子颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complex, pollution exists in the production process, the bond strength is unstable, and it is not conducive to the recycling of packaging bags
Although the publication number CN1483568A proposes a production method of heat welding instead of gluing, its production process is complicated, it can neither be formed at one time, nor does it solve the problem of heat welding between the lower part of the valve port and the bag body

Method used

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  • Block bottom valve packing bag containing thermoplastic plastics and manufacturing method thereof
  • Block bottom valve packing bag containing thermoplastic plastics and manufacturing method thereof
  • Block bottom valve packing bag containing thermoplastic plastics and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Will figure 1 As shown, the two ends of the tubular polypropylene bag body (1) that is compounded with polyethylene film on the outside are folded as image 3 shown, and continue to fold the side (2) inwards to form Figure 4 Bag bottoms (3) and (4) shown. Insert a Teflon cloth of heat-resistant material into one short side of the bottom (3) of the bag. As a preferred solution, the cylindrical valve port (5) with the same bag body material can be flattened and inserted into the bottom of the bag (3). As an optional solution, the valve port can also be made of polyethylene material, and lined Into the heat-resistant material. An additional layer of the same material is respectively added on the bottom of the bag (3) and / or (4), and the side compounded with polyethylene film faces the bottom of the bag to form Figure 5 Semi-finished product shown. As an optional solution, the material of the additional layer may be polyethylene or polypropylene or other materials, a...

Embodiment 2

[0020] Will figure 2 As shown, the two ends of the tubular polypropylene bag (12) that the outside is covered with polyethylene film (11) are folded as image 3 shown, and continue to fold the side (2) inwards to form Figure 4 Bag bottoms (3) and (4) shown. Such as Figure 4 , a heat-resistant material polytetrafluoroethylene cloth or a cylinder-shaped flattened valve port (5) is partially inserted into a short side at the bottom of the bag (3). As a preferred solution, the valve port can also be made of polyethylene, and a heat-resistant material is lined therein. On the bag bottom (3) and (4), add one deck polypropylene additional layer respectively, form Figure 5 Semi-finished product shown. As an option, the material of the additional layer can also be polyethylene or other materials, forming Figure 5 Semi-finished product shown. Also can not add additional layer as what insert is valve port. Such as Figure 6 , through two slits (9) on a platform (10) will ...

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Abstract

The invention discloses a block bottom valve packing bag containing thermoplastic plastics and a manufacturing method thereof. Thermoplastic plastic thin film is compounded or sleeved outside a cylindrical packing material with a melting point higher than that of the thermoplastic plastic thin film, round openings at the two ends of the thermoplastic plastic thin film are folded into a geometrical shape with multiple edges to form two bottoms, a heat-resisting material or a thermoplastic plastic valve lined with the heat-resisting material is additionally arranged at the short edge of one bottom, and additional layers are arranged on the two bottoms, and then multi-edge pressure welding is carried out on the two bottoms through a heated high-pressure die or an air heater, and thus a packing bag with a thermal-welding bottom is formed. The manufacturing method has simple processes and low cost and is applicable to mechanical production; moreover, the bag bottom has high strength, and the pollution caused by the traditional gluing process can be reduced.

Description

technical field [0001] The invention relates to a packaging bag, in particular to a thermoplastic square bottom valve bag and a manufacturing method thereof. Background technique [0002] At present, most of the bag bottoms of thermoplastic square bottom valve bags (such as polyethylene square bottom valve bags) and thermoplastic composite valve bags (such as polypropylene woven film-coated square bottom valve bags) are pasted with adhesives. Its process is complex, there is pollution in the production process, the bonding strength is unstable, and it is not conducive to the recycling of packaging bags. Although the publication number is CN1483568A which proposes a method of heat welding instead of gluing, its manufacturing process is complicated, it can not be formed at one time, and the problem of heat welding between the lower part of the valve port and the bag body is not solved. Contents of the invention [0003] In order to overcome the shortcomings of the prior art...

Claims

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Application Information

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IPC IPC(8): B31B29/00B65D30/24
Inventor 王子颖
Owner 王子颖
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