Preparation method of pvc heat-shrinkable label film with water injection in two bubbles
A heat shrinking and labeling technology, which is applied in the field of plastic film processing, can solve problems such as differences in stretching and directional molding of molecular chains, affecting the uniformity of the performance of the inner and outer layers of the film, etc., to reduce operating costs and costs, eliminate physical property differences, and increase shrinkage. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0028] see figure 1 and figure 2 ,Such as Figure 1 to Figure 2 As shown, the present invention provides a method for preparing a PVC heat-shrinkable label film with water injection in two bubbles, comprising steps:
[0029] (1) The raw materials are weighed according to the formula, and the formula is calculated in parts by mass, 100 parts of PVC resin, 1.8-2.0 parts of organotin stabilizer, 4.0-6.0 parts of plasticizer, 2.0-3.0 parts of processing aid, anti The impact modifier is 3.2-4.0 parts, the internal lubricant is 0.9-1.5 parts, and the external lubricant is 0.4-0.6 parts. A small amount of anti-blocking agent can also be added, and the material is loaded through the feeding machine 1;
[0030] (2) Add the raw materials into the hopper 2, mix them in a high-speed mixer, and discharge the materials at a temperature of 120 to 125° C. to obtain a high-temperature kneaded material;
[0031] (3) Put the high-temperature kneaded material into a cooling mixer and cool it ...
Embodiment 1
[0039] Heat shrinkable label film product specification requirements:
[0040] Film diameter 870mm, thickness 0.045mm, shrinkage (95°C, 30s) TD≥48%, MD: 0~3%.
[0041] 1. Formula (parts by mass)
[0042] PVC 100 organotin stabilizer 1.8 plasticizer 4.0 processing aid ACR 2.0 impact modifier MBS 4.0 internal lubricant 0.9 external lubricant 0.4 anti-blocking agent 0.003.
[0043] 2. Mixing (kneading)
[0044] The resin and its various additives in the formula, after correct calculation and accurate weighing, are added into the high-speed mixer for heating and mixing. After reaching the specified temperature and time, it is unloaded into the cooling mixer and cooled to obtain a uniform, loose and easy-flowing powder mixture with a certain volume density, which can be used for direct molding by a single-screw extruder.
[0045] Main control parameters: the discharge temperature of the high-speed mixer is 120-125°C; the discharge temperature of the cooling mixer is less than 50...
Embodiment 2
[0057] Heat shrinkable label film product specification requirements:
[0058] Film diameter 950mm, thickness 0.07mm, shrinkage rate (95°C, 30s) TD≥45%, MD: 0~5%.
[0059] 1. Formula
[0060] PVC 100 organotin stabilizer 2.0 plasticizer 6.0 processing aid ACR 3.0 impact modifier MBS 3.2 internal lubricant 1.5 external lubricant 0.6.
[0061] 2. The mixing process is the same as in Example 1
[0062] 3. The process of extrusion plasticization and secondary inflation molding is the same as that of Example 1
[0063] The main process parameters of the single-screw extruder are shown in Table 3.
[0064] table 3
[0065]
[0066] Water heating temperature: 79°C. The water temperature in the sizing water mold 12 is 11° C., and the water injection height in the second bubble (the distance from the internal liquid level to the center of the second traction roller 10 ) is 360 mm.
[0067] For the comparison sample, the formula and processing equipment of the ordinary water ba...
PUM
| Property | Measurement | Unit |
|---|---|---|
| size | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More