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Design and Performance Study on the Black & White Film for Milk Packaging

Author: WangPingLi
Tutor: XuWenCai；CaoGuoRong
School: Beijing Institute of Printing
Course: Materials Physics and Chemistry
Keywords: Black and white film Uniform Design Method Co-extruded composite Regression model
CLC: TB484
Type: Master's thesis
Year: 2006
Downloads: 334
Quote: 1
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Abstract


In this thesis, in determining the structure and layers of raw materials and the proportion ranges , based on a uniform design experimental program were prepared through three co-extruded composite black and white film , black and white film test and analysis uniform blackness and whiteness uniform resistance, tensile strength, heat sealing, friction coefficient, air permeability and moisture permeability , etc., for the black and white film formulation and structure to provide a guiding design methods. Black and white film material of structural design , the , the inner layer , the material composition of the \Functional design of the layers : the outer ( printed layer ) is white , from the moisture barrier , blocking light effects ; middle layer of white , black and from the inner moisture barrier covering the role ; lining is black , from the light and heat sealing effect. Design of the experiment, the outer , middle and inner layer of linear low density polyethylene content as one of three factors , the content in the range 30% to 80% of changes, the level of each factor to take six . The results showed that: when the outer and middle layers of the white masterbatch content greater than or close to the inner layer of black masterbatch content , the film whiteness high barrier strongest light ; affect the mechanical properties of the film are the main factors linear low density polyethylene base resin in the added amount , obtained by quadratic regression equation of the regression , and gives the optimum content of linear low density polyethylene and the best mechanical properties of the film ; sealing pressure is 0.25MPa the sealing strength is the most stable ; film surface friction coefficient within the range of 0.2 to 0.4 , to meet the requirements of automatic packaging machines ; amount of oxygen through the film with the increase of the content of linear low density polyethylene decreases , the carbon black layer can also be increased to reduce the oxygen by volume, which is mainly carbon role of the multi-layer films of different materials through the oxygen diffusion on the interface , to increase the dairy carbon layer can play the role of light , can reduce the impact of photosensitivity ; polyethylene itself is a good moisture barrier material, adding a small amount of black or white masterbatch masterbatch , moisture barrier properties of the films have little effect .

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CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Packaging Engineering > Packaging materials
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