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A method for improving the plasticizing effect of cast stretch film

A wrapping film and casting technology, which is applied in the field of improving the plasticizing effect of cast wrapping film, can solve the problems of increasing the number of shutdowns for cleaning, easy to produce coke material, and mutual fusion of raw materials, so as to ensure the production process conditions and improve the surface smoothness. , the effect of improving the stability of the foam

Active Publication Date: 2016-01-20
JUSHI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional formula only uses LLDPE raw materials, metallocene and tackifier in combination. The stretch film produced by mixing these raw materials by heating, melting and casting is prone to poor plasticizing effect, because the melting point of each raw material is different, resulting in heating It must be produced at the highest temperature among the three raw materials, so that the raw materials cannot be well integrated with each other. When the temperature is too high, it is easy to produce coke, and if the temperature is too low, it is easy to produce crystal points, and these crystal points will have a serious impact on the use of the stretch film. For example: during the stretching process of the stretch film, holes will appear at the crystal point, causing the stretch film to be broken
Long-term production will also accumulate coke on the lip of the mold, which will greatly affect the quality of the film and increase the number of shutdowns for cleaning

Method used

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  • A method for improving the plasticizing effect of cast stretch film
  • A method for improving the plasticizing effect of cast stretch film
  • A method for improving the plasticizing effect of cast stretch film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0027] The raw material composition is as shown in Table 1:

[0028] Table 1

[0029]

[0030] Note: LLDPE is Saudi 218NT, and PIB is the PIB of Shenzhen Beihua Plastic.

[0031] The schematic diagram of the overall connection of the equipment used in Embodiments 1 to 3 is shown in Figure 4 , the specific equipment operating parameters are shown in Table 2:

[0032] Table 2

[0033] Stretch film production process parameters

[0034]

[0035]

[0036] Experimental result shows, when adopting the formula of embodiment 1, adjuvant has no obvious improvement to product quality. The coke material at the lip of the mold is still fine, and there are many holes in the sample in the branch factory, resulting in serious fracture. After each layer proportioning of auxiliary material is brought up to 1.12% (embodiment 2), product quality has obviously improved, but each layer proportioning of auxiliary material is higher than 1.12% when (embodiment 3) product quality does ...

Embodiment 4

[0040] Raw material composition is as shown in table 4:

[0041] Table 4

[0042]

[0043] The equipment used in embodiment 4 and comparative examples and the specific equipment operating parameters are the same as those in embodiments 1-3 (as shown in table 2).

[0044] The experimental results show,

[0045] ①. When the comparative example was produced without using the multifunctional auxiliary material of phenylpropanolamine hydrochloride, crystal points and scorched material on the surface of the stretch film were serious, and a lot of scorched material accumulated on the lip of the mold and scratches occurred. There are serious defects in product quality. To ensure product quality, the crystal point and coke material can only be improved when the equipment speed is reduced to 80 m / min.

[0046] ②. In Example 4, when the multifunctional auxiliary material phenylpropanolamine hydrochloride is used for production, the operating speed of the equipment can be increased t...

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Abstract

The invention discloses a method for improving a plasticizing effect of a casting wrapping film. The method is characterized in that the casting wrapping film is a three-layer coextruded casting wrapping film; a multifunctional auxiliary material, namely phenylpropanolamine hydrochloride, is added into each layer of raw materials, and the adding amount of the phenylpropanolamine hydrochloride (PPA) in each layer of raw materials is above 1.12wt%. By utilizing the method disclosed by the invention, the quality of the wrapping film can be effectively improved, cokes can be effectively reduced, and the productivity can be increased.

Description

(1) Technical field [0001] The invention relates to a method for improving the plasticizing effect of cast wrapping film. (2) Background technology [0002] The raw materials for conventional cast stretch film production are mainly linear low-density polyethylene (LLDPE) raw materials (including carbon 4 linear strands, carbon 6 linear strands, carbon 8 linear strands, metallocene linear strands, etc.), and according to the film viscosity Appropriate tackifiers need to be added. [0003] The conventional formula only uses LLDPE raw materials, metallocene and tackifier in combination. The stretch film produced by mixing these raw materials by heating, melting and casting is prone to poor plasticizing effect, because the melting point of each raw material is different, resulting in heating It must be produced at the highest temperature among the three raw materials, so that the raw materials cannot be well integrated with each other. When the temperature is too high, it is ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/06
CPCB29C48/022B29C48/08B29C48/18
Inventor 黄庆梁伦建年夫彪余潮波
Owner JUSHI GRP CO