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Manufacturing technology of valve bag

A production process and valve bag technology, which is applied in the field of valve bag production technology, can solve the problems of reduced material bearing capacity, reduced valve bag quality, valve bag easily damped, etc., and achieves convenient sealing, high load-bearing and telescopic performance, and convenience. The effect of transportation and storage

Inactive Publication Date: 2018-08-31
杭州长荣塑料制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when filling under high pressure environment, the existing valve pockets are made of thicker materials, and therefore the valve pockets are not breathable
Secondly, the current valve pockets include composite valve pockets. In the prior art, the outer layer of paper and the inner layer of warp and weft plastic woven materials are used. Such valve pockets are prone to moisture, which will cause the quality of the valve pockets to decline and be easily damaged. decrease

Method used

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  • Manufacturing technology of valve bag
  • Manufacturing technology of valve bag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as Figure 1-2 As shown, a valve pocket includes a valve pocket body 4 and a valve port 5 . The valve pocket bag body 4 sequentially includes a waterproof paper layer 1, a braided layer 2, and a pressure-resistant paper layer 3 from the outside to the inside; Infuse it into the bag body, and after the material is fully filled, fold the external valve port 5 toward the inner cavity of the valve body, and automatically seal under the gravity of the valve bag inner cavity filled with powder. As long as the two sides of the valve port 5 are not aligned, it can be two sides with the same edge shape but one side is long and the other side is short, or two sides with different edge shapes to facilitate the opening of the robot arm.

[0024] The waterproof paper layer 1, the braided layer 2 and the pressure-resistant paper layer 3 are interlaced and rolled together to form the valve bag body 4. This method can enhance the connection strength of the valve bag seal. Ultras...

Embodiment 2

[0036] The valve bag of this embodiment is the same as that of Embodiment 1, and its manufacturing method is basically the same as that of Embodiment 1, the difference being: step (1) mixed material weaving: take ethylene-propylene copolymer 70% by weight, filler masterbatch 16% , lubricant 6%, and composite flame retardant 8% are mixed uniformly as braided layer raw materials, and dried to obtain braided layer material. The drying temperature is 140 ° C, and the drying time is 1.4h; specifically, the calcium carbonate proportion in the mixture is 70%, 1% titanate coupling agent, 5% dispersant, 24% carrier resin; specifically, the mixing temperature of the braided layer raw materials is 80° C., and the mixing time is 15 minutes.

Embodiment 3

[0038]The valve bag of this embodiment is the same as that of Example 1, and its manufacturing method is basically the same as that of Example 1, except that: step (1) mixed material weaving: take 68% of ethylene-propylene copolymer and 17% of filler masterbatch by weight , lubricant 7%, and composite flame retardant 8% are mixed evenly as braided layer raw materials, and dried to obtain braided layer material. The drying temperature is 1350 ° C, and the drying time is 1.3h; specifically, the calcium carbonate proportion in the mixture is 68%, titanate coupling agent 2%, dispersant 8%, carrier resin 22%; specifically, the mixing temperature of the braid layer raw materials is 75° C., and the mixing time is 18 minutes.

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Abstract

The invention provides a manufacturing technology of a valve bag. The manufacturing technology comprises the following steps of material mixing for weaving; wire drawing and cloth rolling; cloth slitting and film laminating; perforating and rolling; aligning and bonding; forming of the valve bag; and winding and printing. The manufacturing technology of the valve bag has the beneficial effects that a braided layer material with certain flame retardancy is manufactured by using a filling master batch mixture, an ethylene-propylene copolymer, a lubricant and a composite flame retardant at scientific proportioning; an ultrasonic welding technology is adopted, so that the square valve bag is firm in structure; different from a composite valve bag in the prior art, the outermost layer of the valve bag is a waterproof paper layer, and an inner layer is an anti-pressure paper layer, so that the valve bag has a damp-proof effect; and the technological process flow is simple, the air permeability and the sealing performance of the manufactured valve bag are both achieved, the sealing is convenient, the damage rate of the valve bag is low, the load-bearing and telescopic performance is high,meanwhile the flame-retardant function is achieved, and transportation and storage are convenient.

Description

technical field [0001] The invention relates to the field of packaging machinery, and more specifically, to a manufacturing process of valve pockets. Background technique [0002] Nowadays, the packaging of materials such as ultrafine powder and granular materials, such as fine chemical raw materials, pharmaceutical and chemical raw materials, and even materials such as food such as flour and food seasonings, has gradually transitioned from the previous manual packaging mode. Up to the present semi-automatic or fully automatic machine packaging, valve bags are widely used because of the high efficiency of automatic filling, accurate measurement and less manpower input. Especially when filling in a high-pressure environment, the existing valve pockets are all made of thicker materials, and therefore such valve pockets do not have air permeability. Secondly, the current valve pockets include composite valve pockets. In the prior art, the outer layer of paper and the inner lay...

Claims

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Application Information

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IPC IPC(8): B31B70/84B31B70/14B31B70/62B31B70/64C08L23/08C08L101/00C08K3/26C08K5/10B32B27/10B32B27/32B32B37/00
CPCB31B70/84B31B70/14B31B70/62B31B70/64B32B27/10B32B27/32B32B37/00B32B2307/3065B32B2307/7265C08K2003/265C08L23/0815C08L2201/02C08L101/00C08K3/26C08K5/10
Inventor 季存标
Owner 杭州长荣塑料制品厂