本文選題：氣調(diào)包裝 + 微孔�。� 參考：《天津科技大學(xué)》2017年碩士論文

【摘要】：熱壓成型淋膜紙板淺盤和上層熱封薄膜構(gòu)成的淺盤包裝在歐美及其他國家已被應(yīng)用于食品包裝。打孔氣調(diào)包裝則是果蔬包裝一項(xiàng)常用的技術(shù)。本研究結(jié)合當(dāng)淺盤應(yīng)用于果蔬包裝時(shí),生產(chǎn)商一般會(huì)在上層封合薄膜表面打孔的現(xiàn)狀,采用將微孔分布于包裝淺盤側(cè)壁的研究方法,以期解決三個(gè)問題。一是當(dāng)封合薄膜為生物塑料時(shí),由于其較非生物塑料更脆,打孔將嚴(yán)重降低淺盤的機(jī)械強(qiáng)度;二是在運(yùn)輸和倉儲(chǔ)過程中,淺盤呈堆碼狀態(tài),下層淺盤的微孔可能會(huì)被上層淺盤的底部壓住,影響氣體交換;三是果蔬的呼吸作用會(huì)產(chǎn)生水分,包裝內(nèi)易形成凝露,若將微孔排布在上層薄膜上,微孔則可能會(huì)被凝露堵塞,而若將其排布在淺盤側(cè)壁上,則不會(huì)受到凝露的影響。本課題是基于在淺盤側(cè)壁打孔以提高包裝保鮮功能的想法,來研究開孔方法以及微孔排布對(duì)包裝淺盤整體性能影響的。本課題探究了在紙基包裝淺盤側(cè)壁打孔對(duì)淺盤性能的影響。研究綜合國內(nèi)外已有研究進(jìn)行了全面的文獻(xiàn)綜述,深入地探究了微孔的排布方式和打孔方式對(duì)淺盤機(jī)械性能的影響。另外,針對(duì)其對(duì)包材的透氣透濕性能的影響作了簡(jiǎn)要的討論。研究中對(duì)微孔在試樣上的分布進(jìn)行了實(shí)驗(yàn)設(shè)計(jì),觀測(cè)比較了不同種紙板材料不同打孔方式所得微孔的結(jié)構(gòu)、外觀和大小,以及試樣的斷面結(jié)構(gòu)。研究中對(duì)機(jī)械打孔和激光打孔所得微孔的形貌作了觀測(cè)。在微孔排布對(duì)紙基淺盤機(jī)械性能的影響方面,采用多種方法進(jìn)行了仔細(xì)的分析。通過實(shí)驗(yàn)和分析,得出以下的結(jié)論:在手工打孔條件下,在樣條寬度方向上,隨著打孔數(shù)增多,試樣機(jī)械強(qiáng)度下降,當(dāng)超過5個(gè)孔時(shí),下降明顯。從25種打孔排布來看,在橫向同一排最多打4個(gè)孔的情況下,試樣機(jī)械強(qiáng)度最大下降了 22%。孔的排布越分散,試樣的拉伸性能的損失越小。沿寬度方向打孔數(shù)量的增加會(huì)降低試樣的拉伸強(qiáng)度。樣張橫向與縱向測(cè)試結(jié)果差異明顯,且變化趨勢(shì)并不完全一致,這都是由于紙張抄造過程中的方向性造成的。激光打孔后的抗張強(qiáng)度測(cè)試,變化趨勢(shì)并不明顯。綜上所述,微孔對(duì)淺盤包裝機(jī)械性能的影響完全是在合理的范圍內(nèi)的。在三種試樣中,未淋膜紙板具有最高的水分透過率,其次的是PET淋膜紙板,第三是PE淋膜紙板。測(cè)試打孔密度可提高PET淋膜紙板的水分透過率約42%。不同種材料激光打孔后外觀有明顯區(qū)別,激光打孔得到的微孔,相較于機(jī)械打孔,更加平滑,直徑也更小。
[Abstract]:The hot-pressed coated paperboard and the upper-layer hot-sealed film are used in food packaging in Europe, America and other countries. Perforated atmosphere packaging is a common technology for fruit and vegetable packaging. In this study, when the shallow disk is used in the packaging of fruits and vegetables, the manufacturer generally punches holes on the surface of the upper sealing film, and adopts the method of distributing the micropores on the side wall of the shallow disk in order to solve the three problems. One is that when the sealed film is bioplastic, because it is more brittle than non-biological plastic, punching will seriously reduce the mechanical strength of the shallow disk; second, during the transportation and storage process, the shallow disk is stacked. The micropores of the lower shallow disk may be pressured by the bottom of the upper shallow disk, affecting the gas exchange; third, the respiration of fruits and vegetables will produce moisture, which will easily form condensation in the package. If the micropores are arranged on the upper layer film, the micropores may be clogged by condensation. If it is arranged on the side wall of the shallow disk, it will not be affected by condensation. Based on the idea of perforating the sidewall of shallow disk to improve the function of packaging preservation, this paper studies the effect of opening method and micropore arrangement on the whole performance of shallow disk. The paper explores the effect of sidewall perforation on the performance of paper-based packaging. In this paper, a comprehensive literature review has been carried out, and the effects of the arrangement and punching of the microholes on the mechanical properties of the shallow disk have been deeply explored. In addition, the effect on the permeability of the package is discussed briefly. In the study, the distribution of micropores on the sample was designed experimentally, and the structure, appearance and size of the micropores and the cross-section structure of the samples were observed and compared with different kinds of paperboard materials. In the study, the morphology of the micropores obtained by mechanical and laser drilling were observed. The influence of micropore arrangement on mechanical properties of paper-based shallow-disk is analyzed in detail by various methods. Through experiment and analysis, the following conclusions are drawn: under the condition of manual drilling, the mechanical strength of the sample decreases with the increase of the number of holes in the width direction of the spline, and the decrease is obvious when the hole is more than 5 holes. According to 25 kinds of perforating arrangement, the maximum mechanical strength of the sample decreases by 22 when 4 holes are punched in the same horizontal row. The more dispersed the pore is, the smaller the loss of tensile properties of the sample is. The increase in the number of holes in the width direction will reduce the tensile strength of the sample. The results of transverse and longitudinal tests are obviously different, and the variation trend is not completely consistent, which is caused by the directionality in the process of paper making. The change trend of the tensile strength after laser drilling is not obvious. To sum up, the effect of micropores on the mechanical properties of shallow disk packaging is completely within a reasonable range. Among the three samples, uncoated paperboard has the highest water transmittance, followed by PET coated board and PE coated paperboard. The water transmittance of PET coated board can be increased by measuring the perforation density. There are obvious differences in the appearance of different materials after laser drilling. Compared with mechanical drilling, the microholes obtained by laser drilling are more smooth and smaller in diameter.
【學(xué)位授予單位】：天津科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB48

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本文編號(hào)：1978280