KR20020015407A - transparent synthetic sheet and method for producing the same - Google Patents
transparent synthetic sheet and method for producing the same Download PDFInfo
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- KR20020015407A KR20020015407A KR1020000048494A KR20000048494A KR20020015407A KR 20020015407 A KR20020015407 A KR 20020015407A KR 1020000048494 A KR1020000048494 A KR 1020000048494A KR 20000048494 A KR20000048494 A KR 20000048494A KR 20020015407 A KR20020015407 A KR 20020015407A
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- synthetic resin
- sheet
- resin
- weight
- hardness
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 32
- 239000000057 synthetic resin Substances 0.000 claims abstract description 32
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 9
- 229920000178 Acrylic resin Polymers 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 abstract description 11
- 239000011347 resin Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 8
- 238000007639 printing Methods 0.000 abstract description 8
- 230000003068 static effect Effects 0.000 abstract description 6
- -1 acryl Chemical group 0.000 abstract description 4
- 230000000704 physical effect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000002216 antistatic agent Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/865—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
Abstract
Description
본 발명은 투명한 합성수지 시이트 및 그의 제조방법에 관한 것으로, 보다 상세히 말하면 학용품이나 사무용품의 책받침이나 서류철, 포장재 등으로 사용될 때의 최적 경도를 충족시키면서 투명도를 향상시킨 투명한 합성수지 시이트 및 그의 제조방법에 대한 것이다.The present invention relates to a transparent synthetic resin sheet and a method of manufacturing the same, and more particularly, to a transparent synthetic resin sheet and a method for producing the transparent resin sheet with improved transparency while satisfying the optimum hardness when used as a support, file folders, packaging materials, etc. of school supplies or office supplies .
요즈음 우리 주위에는 기존의 종이로 만들어진 상자, 서류철, 부채들의 대체품으로서, 또 그 밖의 화장품 케이스, 비디오 케이스, 식품케이스 등 다양한 용도로 시이트(sheet)상태의 합성수지가 이용되고 있다.These days, sheet-like synthetic resins are used around us as substitutes for paper boxes, files, and fans, as well as cosmetics cases, video cases, and food cases.
그런데, 지금까지의 이러한 합성수지 시이트는 경도가 약하고 탄력성이 적어 요구되는 경도 및 탄력성을 충족시키려면 두껍게 제작되어야 하므로 무겁고 투박스러우며 제조 단가가 많이 들었다.However, until now, such a synthetic resin sheet has a weakness and a low elasticity, so that the synthetic resin sheet needs to be made thick to meet the required hardness and elasticity.
게다가, 투명하지 못하고 반투명 내지 불투명한 것이 대부분이었으며, 이에 더해 이러한 제품은 정면에서 볼 때는 잘 보이지 않으나 옆으로 각도를 주고 볼 경우에 나타나는 점, 사선 등의 가느다란 줄이 표면에 다수 형성되어 있어서 탁도(濁度)를 증가시키고 있었다.In addition, most of them were not transparent, translucent or opaque, and in addition, these products are hard to see when viewed from the front, but have many thin lines such as dots and diagonal lines that appear when viewed at an angle to the side, so that turbidity (濁度) was increasing.
도1에 나타난 바와 같이 종전 제품의 경우 이렇게 시이트 표면(A)에 점(1), 줄(2)이 형성된 이유는 합성수지를 시이트 상태로 압출한 후 이것을 원하는 형상 및 크기로 제작하려고 할 때 시이트 표면(A)에 정전기가 심하게 발생하여 시이트와 시이트가 서로 들러붙어서 한 장씩의 이동이 어려워서 작업이 불가능하였다. 그래서 이를 해결하기 위한 한 방편으로 가는 줄(2) 또는 점(1)을 시이트 표면(A)에 다수 형성한 것으로, 이들로 인해 생긴 공간으로 공기가 공급될 수 있어서 정전기 발생을 현격히 줄여줄 수 있으므로 이 방식을 채택하고 있다.As shown in Fig. 1, in the case of the conventional products, the reason why the dots 1 and the strings 2 are formed on the sheet surface A is obtained by extruding the synthetic resin in the sheet state and then manufacturing the sheet into a desired shape and size. The static electricity generated in (A) severely caused the sheets and sheets to stick together, making it difficult to move the sheets one by one. Therefore, a large number of lines (2) or points (1) are formed on the sheet surface (A) to solve this problem, and air can be supplied to the spaces created by them, thereby significantly reducing the generation of static electricity. This approach is adopted.
그리고, 최근에는 이 분야의 기술이 발달하여 합성수지 시이트를 보다 투명하게 제조할 수는 있으나 그런 방법에 의할 경우 제조단가가 비싸게 먹히므로 책받침과 같은 저가의 합성수지 제품의 제조에는 비용면에서 도저히 적용할 수가 없었다.In recent years, the technology of this field has been developed to produce a transparent resin sheet more transparently, but the manufacturing cost is expensive in such a method, so it is hardly applicable in terms of cost to manufacture a low-cost synthetic resin product such as a book holder. I could not.
본 발명자는 저가품의 합성수지 시이트에 있어서의 상기 단점을 인식하고 보다 고품질의 제품을 저렴하게 제공할 수 있는 방법에 대해 예의 연구한 바, 본 발명을 안출하게 되었다.The inventors of the present invention have devised the present invention by recognizing the above-mentioned disadvantages in the low-cost synthetic resin sheet and intensively studying a method for providing a higher quality product at a lower cost.
본 발명에서는 기존의 합성수지 성분을 특정비율로 조정함으로써 간단한 방식으로 투명하고 표면에 흠이 없어 깨끗하며 인쇄작업이 순조롭고 인쇄상태가 선명하며 얇으면서도 경도가 적당한 고 품질의 합성수지 시이트 제품을 제조할 수 있는 방법을 개발하게 되었다.In the present invention, by adjusting the existing synthetic resin component to a specific ratio, it is transparent in a simple manner, there is no scratches on the surface is clean, the printing operation is smooth, the printing state is clear and thin, but it is possible to produce a high-quality synthetic resin sheet of moderate hardness I developed a method.
도1은 통상의 합성수지 시이트로 이루어진 서류철의 사시도,1 is a perspective view of a file folder made of a conventional synthetic resin sheet;
도2는 본 발명에 따른 합성수지 시이트로 제조된 서류철의 사시도.Figure 2 is a perspective view of a file made of a synthetic resin sheet according to the present invention.
※도면의 주요부분에 대한 부호의 설명※ Explanation of symbols for main parts of drawing
A : 시이트 표면 1 : 점A: sheet surface 1: point
2 : 줄 3 : 봉합선2: line 3: suture
4 : 인쇄부분4: printing part
본 발명에 의하면 폴리올레핀 수지(polyolefin resin) 87∼95중량％와 아크릴 수지(acrylic resin) 5∼13중량％로 이루어지는 조성물에 의해 성형되는 것을 특징으로 하는 투명한 합성수지 시이트를 제공한다.According to the present invention, there is provided a transparent synthetic resin sheet, which is molded from a composition consisting of 87 to 95% by weight of a polyolefin resin and 5 to 13% by weight of an acrylic resin.
또한, 본 발명에 의하면 합성수지의 혼합단계, 압출단계 및 성형단계로 이루어지는 합성수지 시이트 제조방법에 있어서,In addition, according to the present invention, in the synthetic resin sheet manufacturing method comprising a mixing step, extrusion step and molding step of the synthetic resin,
상기 합성수지가 각기 87∼95중량％와 5∼13중량％의 폴리올레핀 수지와 아크릴 수지로 이루어지는 조성물이며;The said synthetic resin is a composition which consists of 87 to 95 weight% and 5 to 13 weight% of polyolefin resin and an acrylic resin, respectively;
상기 압출단계에서의 압출온도가 200∼280℃인 것을 특징으로 하는 투명한 합성수지 시이트의 제조방법을 제공한다.Provided is a method for producing a transparent synthetic resin sheet, characterized in that the extrusion temperature in the extrusion step is 200 ~ 280 ℃.
상기 폴리올레핀 수지의 양이 87중량％이하이면 경도가 너무 세어 꺾어질 경우 제품이 부러지고, 95중량％이상이면 경도가 약하여 원하는 제품을 얻을 수 없다. 또 상기 아크릴 수지가 5중량％이하이면 너무 유연하고 13중량％이상이면 딱딱해지므로 경도측면에서 각기 부적당하므로 상기 범위 내에서 사용되는 것이 중요하다.If the amount of the polyolefin resin is 87% by weight or less, the product is broken when the hardness is too high and the material is broken. If the content is 95% by weight or more, the desired product cannot be obtained. In addition, since the acrylic resin is 5 wt% or less, it is too flexible, and if it is 13 wt% or more, it becomes hard. Therefore, it is important to be used within the above range because the acrylic resin is inadequate in terms of hardness.
또한, 본 발명에 따른 투명한 합성수지 시이트는 그 제조시 압출단계에서의 압출온도가 중요한 요소로 200∼280℃범위 내이어야 한다. 왜냐하면 압출온도가 200℃이하이면 합성수지가 용융되지 않으며 280℃이상이면 성형이 불가능하기 때문이다.In addition, the transparent synthetic resin sheet according to the present invention should be in the range of 200 ~ 280 ℃ as an important factor the extrusion temperature in the extrusion step in the production. This is because the synthetic resin is not melted when the extrusion temperature is 200 ° C. or lower, and molding is impossible when the extrusion temperature is 280 ° C. or higher.
본 발명에서 사용되는 폴리올레핀 수지로는 폴리프로필렌 수지(polyAs the polyolefin resin used in the present invention, polypropylene resin (poly
propylene resin) 또는 폴리에틸렌 수지(polyethylene resin)를 들 수 있으며, 경우에 따라 통상의 대전방지제가 소량 첨가된다.propylene resin or polyethylene resin, and in some cases, a small amount of a conventional antistatic agent is added.
이하, 본 발명을 보다 용이하게 이해할 수 있도록 다음에 일 실시례를 들어 기술하며, 이 실시례는 단지 본 발명의 일례로 기술될 뿐, 본 발명은 그 범주 및 특허청구의 범위 내에서 변형 및 정정이 가능함은 물론이다. (실시례에서의 ％는 중량백분율을 나타낸다.)Hereinafter, one embodiment will be described in order to make the present invention easier to understand, and this embodiment is only described as an example of the present invention, and the present invention is modified and modified within its scope and claims. Of course this is possible. (% In the examples represent weight percentages.)
(실시례 1)(Example 1)
폴리프로필렌수지로서 펠럿 상태의 니폰페이퍼사(nippon paper co., LTD)제 803MWS 92％와 아크릴수지로서 네오 크릴(NEO CRYL) B-725(일본 제네카사제) 펠럿 8％를 호퍼에 투입하여 잘 혼합한 다음, 거기에 MEC-300(TEIKOKU KAKO CO., LTD)사제 대전방지제와 연 분홍색 안료를 극소량 추가하여 혼합하였다.92% of 803MWS, made from nippon paper co., LTD, as a polypropylene resin, and 8% of a pellet made of NEO CRYL B-725 (manufactured by Geneca, Japan) as an acrylic resin, were mixed well. Then, there was added a small amount of an antistatic agent and a light pink pigment manufactured by MEC-300 (TEIKOKU KAKO CO., LTD.) And mixed there.
이어 압출기에서 270℃로 가열하고 가소화한 다음 시이트 상태로 압출 성형하였다.It was then heated to 270 ° C. in an extruder, plasticized and extruded into sheets.
제조된 시이트로 서류철을 만들기 위하여 재단기에 의해 알맞는 크기로 상기 얻어진 시이트를 절단한 후, 도2에 나타낸 바와 같이 1면을 열압착하여 봉합선(3)을 형성하고 필요한 내용을 인쇄하였다.The sheet thus obtained was cut to a suitable size by a cutting machine in order to make a file with the prepared sheet. Then, as shown in FIG. 2, one surface was thermocompressed to form a suture line 3, and the necessary contents were printed.
그리하여 연 분홍색의 소정 크기의 서류 보관 및 정리용 서류철을 얻었다. 이 서류철에 보관된 서류상의 글씨가 외부에서 선명히 보일 정도로 완성된 서류철은 투명하였으며 얇으면서도 경도가 적당하여 서류가 구겨질 염려가 없었다.Thus, a file folder for storing and organizing documents of a predetermined size of light pink was obtained. The finished file was transparent and thin, and the hardness was so strong that the letters on the file could be clearly seen from the outside.
무엇보다도 서류철로의 재단공정 및 서류철 시이트 표면(A)상의 인쇄 부분(4)의 형성시에도 전혀 정전기가 발생됨이 없이 작업이 순조롭게 진행되었으며 인쇄상태가 선명하였다.Above all, even during the cutting process of the paper file and the formation of the printing portion 4 on the paper sheet surface A, the work proceeded smoothly without any static electricity and the printing state was clear.
(실시례 2)(Example 2)
상기 실시례 1에서의 폴리프로필렌수지 대신 동량의 폴리에틸렌수지를 사용한 것을 제외하고는 상기 실시례 1에서와 동일한 방식으로 서류철을 제조하였다.A filing file was prepared in the same manner as in Example 1, except that the same amount of polyethylene resin was used instead of the polypropylene resin in Example 1.
완성된 서류철은 실시례 1에서의 것과 경도, 강도 및 투명도가 동일하여 실제 감촉으로는 두 개 분간이 어려웠다.The finished file was the same in hardness, strength, and transparency as in Example 1, making it difficult for two minutes to actually feel.
(비교 실시례)(Comparative Example)
폴리염화비닐수지, 폴리에스테르수지와 폴리아크릴수지를 단독으로 각각 사용하였으며 대전방지제의 양을 3배로 한 것만 상기 실시례 1 및 2와 각기 다를 뿐, 그 외 공정순서 및 조건은 상기 실시례 1 및 2와 동일하게 하여 각기 실험을 진행하였다.The polyvinyl chloride resin, the polyester resin and the polyacrylic resin were used alone, and only three times the amount of the antistatic agent was different from those of Examples 1 and 2, and other process sequences and conditions were the same as those of Examples 1 and 2. Each experiment was carried out in the same manner as 2
폴리염화비닐수지 만으로 제조된 서류철의 경우 가격이 상당히 비쌀 뿐만 아니라 무겁고 불투명하였으며 또 인체에 유해한 물질이 묻어나는 치명적인 단점이 있었다.In the case of a file made of polyvinyl chloride resin alone, the file was not only expensive but also heavy and opaque, and had a fatal disadvantage that a substance harmful to the human body was buried.
폴리에스테르수지 만으로 제조된 경우에는 가요성이 있어 부러지지 않고 제품의 질은 우수하였으나 무겁고 단가가 비싸게 먹히는 단점이 있었으며 재생이 불가능하였다.In the case of the polyester resin alone, it was flexible and the product quality was excellent, but there was a disadvantage of being heavy and expensive.
또, 폴리아크릴수지의 경우 경도가 너무 커서 약간 구부리자 곧 부러졌다. 이러한 성향은 폴리염화비닐수지 만으로 제조된 서류철의 경우와 거의 유사하였다.In addition, in the case of polyacrylic resin, the hardness was so large that it bent slightly and broke. This tendency was almost similar to that of filings made only of polyvinyl chloride resin.
따라서, 어느 특정의 합성수지 단독 성분만으로는 원하는 제품의 물성 및 요구조건을 충족시킬 수가 없었으며 정전기가 상당히 발생하여 시이트상태에서 특정 제품으로의 작업시 어려움이 있었다.Therefore, the specific components of the synthetic resin alone could not satisfy the properties and requirements of the desired product, and there was a considerable amount of static electricity, which made it difficult to work with the specific product in the sheet state.
이상과 같이 본 발명에 따른 합성수지 시이트 및 그의 제조방법에 의하면, 경도, 강도, 탄력성 및 유연성 등의 물성을 용도에 맞게 동시에 적절화할 수 있음과 아울러, 제조시 정전기 발생이 거의 없어 재단 및 접합과 인쇄 등의 후속 작업이 순조롭고 표면에 줄 등의 형성 없이 투명하고 인쇄상태가 선명하며 인체에 무해한 고 품질의 합성수지제품의 생산이 가능하다.As described above, according to the synthetic resin sheet according to the present invention and a method for manufacturing the same, the physical properties such as hardness, strength, elasticity and flexibility can be simultaneously appropriated to suit the purpose, and there is almost no generation of static electricity during manufacture, so that cutting, bonding and printing are possible. It is possible to produce high-quality synthetic resin products that are easy to follow up and are transparent, clear printing state and harmless to human body without the formation of streaks on the surface.
또한, 본 발명에 따른 합성수지 시이트는 그 두께가 얇으면서도 경도가 우수하므로 학용품이나 사무용품의 서류철 또는 책받침, 부채, 비디오나 카세트테이프 등의 포장용 봉지, 또는 화장품 보관용 용기 등의 저가 합성수지제품에 적용할 경우 비용 및 경도 측면에서 매우 적당하여 실용적이다.In addition, since the thickness of the synthetic resin sheet according to the present invention is thin and excellent in hardness, the synthetic resin sheet can be applied to low-cost synthetic resin products such as paper or book support for school supplies or office supplies, packaging bags such as fans, video or cassette tapes, or cosmetic storage containers. The case is very practical in terms of cost and hardness.
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| KR102134006B1 (en) * | 2019-10-07 | 2020-07-14 | 주식회사 이수 | High transparency polypropylene sheet with improved printability and manufacturing method thereof |
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| DE2929959A1 (en) * | 1979-07-24 | 1981-02-19 | Hoechst Ag | THERMOPLASTIC PLASTIC MATERIAL |
| JPH0665431A (en) * | 1992-08-17 | 1994-03-08 | Sumitomo Bakelite Co Ltd | Thermoplastic resin composition |
| KR0166982B1 (en) * | 1993-10-29 | 1999-03-20 | 스기야마 도모오 | Polyolefin resin composition |
| KR0170559B1 (en) * | 1995-10-05 | 1999-03-30 | 성기웅 | Thermoplastic film composition |
| KR100229235B1 (en) * | 1997-03-12 | 1999-11-01 | 이정국 | A film composition for agricultural |
| KR100252824B1 (en) * | 1997-12-23 | 2000-04-15 | 장용균 | Process for preparing polypropylene film for wrapping material |
| KR20000026518A (en) * | 1998-10-21 | 2000-05-15 | 장용균 | Preparation method of polypropylene sheet for transparent case |
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