Knowledge

(1) Low density polyethylene (LDPE): polymerized by high-pressure method, also known as high-pressure polyethylene. Its density is about 0.92g/cm2. Low density polyethylene film ha

Has extremely high transparency and good glossiness Rapid shrinkage at low temperatures Good sealing at high speeds Low temperature and high shrinkage, suitable for small packaging

The packaging of stretch film must be stretched, and the stretching forms of tray mechanical packaging include direct stretching and pre stretching. Pre stretching can be divided i

Polyethylene (PE) film The permeability of PE film is relatively high, and it decreases with the increase of density. PE film has moisture resistance and low moisture permeability.

Quality requirements: (very important) 1. There should be no black impurities, the mold head should be washed clean, and there should be no burnt plastic falling in. Anything visib

1. Stretch packaging saves raw materials compared to shrink packaging, and does not require a heat shrink packaging machine, saving energy. 2. High strength, strong elastic pulling

Stretch wrap film is divided into machine wrap series and hand wrap series. Hand stretch film a, Thickness: 15mic-20mic b, Width: 5cm-45CM c, Elongation: 200% -400% d, Color: Trans

Stretch wrap packaging film is a packaging method for storage. Stretch wrap film is a packaging method that uses mechanical stretching devices or manual stretching to generate defo

Phenomenon: Curling and wrinkling of the product Reason: (1) The design of the upper and lower membranes is unreasonable. (2) The tension between the upper and lower membranes does

Phenomenon: Wrinkles on the film after product packaging. Reason: (1) The heat sealing temperature is too high, the film is subjected to too much heat, and the upper film shrinks.

Phenomenon: There is air inside the film after the heat sealing plate is released. Reason: (1) If the width of the upper film is greater than the width of the heat sealing plate, t

Phenomenon: After being heat sealed or sterilized, there may be separation and layering between the upper and lower films. Reason: (1) The heat sealing temperature is low and canno