Current situation and application prospect of the

The current situation and application prospect of plastic blow molded flexible folding packaging containers

I. Introduction to product history

plastic blow molded flexible folding packaging containers (hereinafter referred to as flexible plastic folding packaging containers) entered China in 1978. At that time, Changzhou plastic factory in Jiangsu Province studied the flexible plastic folding packaging containers made in Japan and improved the problems existing in the flexible plastic folding packaging containers made in Japan, We have designed and manufactured the equipment and auxiliary machines for the production of flexible plastic folding packaging containers. The soft plastic folding packaging containers produced by Changzhou plastic factory in Jiangsu Province won the National Silver Award for the classification and testing method of wind pressure resistance of building external windows gb/t 7106 (2) 002 in 1991, and their product quality has reached the international advanced level

second, compared with general plastic barrels

although every product has its growth period and decline period, the main characteristics of soft plastic are: raw material recycling, product plasticization, environmental protection, cost economy, recycling and biochemical folding packaging containers. Although it has been more than 20 years, its life cycle is still in the growth period. Why in today's era of continuous renewal and vigorous development of packaging containers, Is the flexible plastic folding packaging container still in good condition? Next, we will compare the flexible plastic folding packaging container with the general plastic bucket, and you will find the reason why the plastic folding packaging container is still widely used

1. flexible plastic folding packaging containers can be folded and overlapped during transportation to reduce transportation costs

general plastic barrels cannot be folded and cannot be overlapped during transportation

take 25L as an example, 500 ordinary plastic barrels can be transported, and 1500 flexible plastic folding packaging containers can be transported. In other words, the transportation cost of flexible plastic folding packaging containers is 1/3 of that of ordinary plastic barrels

2. The product of flexible plastic folding packaging containers is light in weight and the cost of raw materials for production is low

take 25L as an example, the general plastic bucket product weighs 1.6kg, and the soft plastic folding packaging container product weighs 0.45kg, that is, the cost of raw materials for the production of soft plastic folding packaging containers is 1/3 of the general plastic bucket production raw materials. 6

3 due to the light weight of soft plastic folding packaging containers, the amount of waste plastic loaded with items of the same capacity is less than that of general plastic buckets, reducing self color pollution

III. product use

the flexible plastic folding packaging container uses non-toxic, tasteless, chemically stable low-density polyethylene LDPE as the main production raw material, which has a wide range of applications. It can be used not only for the packaging of chemicals and detergents, but also for the packaging of food and drugs

IV. product introduction

1. Structure

soft plastic folding packaging container, which is produced by hollow blow molding method. There are two kinds of products

1 hot pressed soft plastic folding packaging container - mouth and box are hot pressed? Crow

2 assembled soft plastic folding packaging container - the mouth and box are assembled

2. Specification

1 hot pressed 5L, 10L, 18L, 20L, 25L

2 assembled 12L, 18L, 25L

3. Main quality index

1 drop strength

under normal temperature, inject water of nominal capacity, tighten the cover, lift the sample to a height of 1.2m, make the bottom of the sample face down and parallel to the cement floor, fall freely from this height, and check it after two consecutive times, without leakage, and allow local deformation and tension

2 compression strength

plate pressure testing machine is used. Inject water of nominal capacity under normal temperature, tighten the cover, place the mouth upward between the parallel pressing plates of the testing machine, apply pressure evenly at the speed of 10 ± 3mm/min, load until 1000N, and maintain the pressure for 5min without breaking or leakage

3 suspension test

at room temperature, inject 1.2g/cm3 of salt water according to the nominal capacity, suspend the hydraulic oil in the oil tank with a lifting rope, drive the high-pressure oil pump into the screw mouth of the oil circuit container through the electromechanical drive, lift it steadily off the ground for 5min, put down the sample, untie the lifting rope for inspection, and no cracks are allowed at the joint of the screw mouth and the container

4 sealing test

tighten the cover according to the nominal capacity of water at room temperature. Place it horizontally on the horizontal ground, and check it after 4h, without leakage

5 see table 1

4 for hygienic properties. Control of molding process

1 because LDPE is not sensitive to moisture absorption, it does not need to be dried before molding processing, and raw packaging materials can be directly used in production

2 control of forming temperature

because the wall thickness of soft plastic folding packaging container is relatively thin, the temperature control requirements of the barrel are strict, because the temperature directly affects the normal degree of pipe falling. If the temperature is high, the extension of pipe falling during blow molding will be large, which will cause the wall thickness of the product? If the temperature is low and the falling pipe is hard, it is difficult to blow molding, which will cause uneven product wall thickness and poor product surface finish

3 control of blowing time and pressure

key process control in the molding process of soft plastic folding packaging containers - blowing time and pressure, when to blow, how much gas to inject, how many times to inject, and how much gas to inject, all directly affect the molding quality

5 process flow

feeding -- Heating -- extrusion parison -- mold closing and blowing molding -- cooling and pressure maintaining -- bleeding -- mold opening -- taking out products

6. Common problems and reasons

VI. conclusion

because the soft plastic folding packaging container has the characteristics that ordinary plastic barrels do not have, plus its simple processing performance, stable product quality, and wide application fields, Therefore, its product development still has great prospects

Author: Wang Qiuyan

from Changzhou Plastic Factory Co., Ltd.

its outsole adopts BASF elastopan and cellasto high-performance materials